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WO2021029263A1 - Article moulé par injection et son procédé de fabrication - Google Patents

Article moulé par injection et son procédé de fabrication Download PDF

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Publication number
WO2021029263A1
WO2021029263A1 PCT/JP2020/029745 JP2020029745W WO2021029263A1 WO 2021029263 A1 WO2021029263 A1 WO 2021029263A1 JP 2020029745 W JP2020029745 W JP 2020029745W WO 2021029263 A1 WO2021029263 A1 WO 2021029263A1
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WIPO (PCT)
Prior art keywords
injection
mass
fibrous filler
molded product
pellet
Prior art date
Application number
PCT/JP2020/029745
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English (en)
Japanese (ja)
Inventor
貴之 杉山
翼 田村
Original Assignee
住友化学株式会社
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Filing date
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Publication of WO2021029263A1 publication Critical patent/WO2021029263A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/12—Making granules characterised by structure or composition
    • B29B9/14—Making granules characterised by structure or composition fibre-reinforced
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/002—Methods
    • B29B7/007—Methods for continuous mixing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/58—Component parts, details or accessories; Auxiliary operations
    • B29B7/72—Measuring, controlling or regulating
    • B29B7/726—Measuring properties of mixture, e.g. temperature or density
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/80—Component parts, details or accessories; Auxiliary operations
    • B29B7/88—Adding charges, i.e. additives
    • B29B7/90—Fillers or reinforcements, e.g. fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/12—Making granules characterised by structure or composition
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/18—Feeding the material into the injection moulding apparatus, i.e. feeding the non-plastified material into the injection unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/78—Measuring, controlling or regulating of temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/06—Fibrous reinforcements only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/40—Glass
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/02—Fibres or whiskers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/12—Polypropene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/02—Making granules by dividing preformed material
    • B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0079—Liquid crystals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
    • B29K2105/10—Cords, strands or rovings, e.g. oriented cords, strands or rovings
    • B29K2105/101—Oriented
    • B29K2105/105—Oriented uni directionally
    • B29K2105/106—Oriented uni directionally longitudinally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2307/00—Use of elements other than metals as reinforcement
    • B29K2307/04—Carbon

Definitions

  • the present invention relates to an injection molded product and a method for producing the same.
  • the present application claims priority based on Japanese Patent Application No. 2019-148155 filed in Japan on August 9, 2019, the contents of which are incorporated herein by reference.
  • thermoplastic resin has lower mechanical properties than the molded product obtained from the metal material.
  • a method of mixing fibers as a filler with a thermoplastic resin has been conventionally proposed in order to improve the strength of a molding material such as a thermoplastic resin composition (see, for example, Patent Document 1). ).
  • the present invention has been made in view of the above circumstances, and an object of the present invention is to provide an injection-molded product having increased strength against a collision load and a method for producing the same.
  • the present invention adopts the following configuration.
  • One aspect of the present invention is an injection-molded article containing 65 to 95 parts by mass of a thermoplastic resin and 5 to 35 parts by mass of a fibrous filler, wherein the thermoplastic resin is a group composed of polypropylene and liquid crystal polyester. At least one selected from the above is contained in an amount of 10% by mass or more based on the total amount of the thermoplastic resin, and the fibrous form in the injection-molded product is determined from the following [Measurement of variation in fibrous filler filling amount (a)]. It is an injection-molded product, characterized in that the standard deviation of the filling amount of the filler exceeds 1.0% by mass.
  • the length-weighted average fiber length of the fibrous filler is preferably 4 mm or more.
  • the fibrous filler is preferably glass fiber.
  • the maximum difference in the filling amount of the fibrous filler in the injection-molded product which is determined from the following [Measurement of variation in fibrous filler filling amount (b)], is 3. It preferably exceeds 0.0% by mass.
  • one aspect of the present invention is the method for producing an injection-molded article, which does not include the first pellet in which the first thermoplastic resin is impregnated with the fibrous filler and the fibrous filler. Having a step of mixing with a second pellet containing a second thermoplastic resin having a lower flow start temperature than the thermoplastic resin of 1 to obtain a pellet mixture, and a step of injection molding the pellet mixture. This is a characteristic method for producing an injection-molded product.
  • the difference in flow start temperature between the first thermoplastic resin or the first pellet and the second thermoplastic resin is 5 ° C. or higher.
  • the melt-kneading temperature of the pellet mixture exceeds the flow start temperature of the second thermoplastic resin and is equal to or lower than the flow start temperature of the first thermoplastic resin or the first pellet. ..
  • an injection-molded article having particularly increased strength against a collision load.
  • a resin molded product having higher mechanical properties, particularly a resin molded product having increased strength against a collision load. ..
  • the injection-molded product of the present embodiment contains a thermoplastic resin and a fibrous filler.
  • the ratio (mass ratio) of the thermoplastic resin to the fibrous filler is 65 to 95 parts by mass of the thermoplastic resin and 5 to 35 parts by mass of the fibrous filler.
  • the mass ratio is preferably 65 to 90 parts by mass for the thermoplastic resin and 10 to 35 parts by mass for the fibrous filler, and more preferably 65 to 85 parts by mass for the thermoplastic resin and 15 to 35 parts by mass for the fibrous filler. It is a department.
  • the ratio of the thermoplastic resin in the injection-molded product is preferably 65 to 95% by mass, more preferably 65 to 90% by mass, and 65 to 85% by mass with respect to 100% by mass of the injection-molded product. It is more preferably%.
  • the ratio of the fibrous filler in the injection-molded product is preferably 5 to 35% by mass, more preferably 10 to 35% by mass, and 15 to 35% by mass with respect to 100% by mass of the injection-molded product. It is more preferably%.
  • the ratio of the thermoplastic resin is 65 to 95% by mass and the ratio of the fibrous filler is 5 to 35% by mass with respect to 100% by mass of the injection-molded product. It is more preferable that the ratio of the thermoplastic resin is 65 to 90% by mass and the ratio of the fibrous filler is 10 to 35% by mass with respect to 100% by mass of the injection-molded product. It is more preferable that the ratio of the thermoplastic resin is 65 to 85% by mass and the ratio of the fibrous filler is 15 to 35% by mass with respect to 100% by mass of the injection-molded product.
  • the ratio of the fibrous filler is equal to or higher than the lower limit of the above range, the effect of improving the strength of the injection-molded product by the fibrous filler can be obtained.
  • the upper limit of the above range when it is not more than the upper limit of the above range, the increase in the melt viscosity of the mixture of the thermoplastic resin and the fibrous filler is suppressed, and the molding processability is improved.
  • the total content of the thermoplastic resin and the fibrous filler in the injection-molded product of the present embodiment is preferably 80% by mass or more, preferably 90% by mass or more, based on the total amount (100% by mass) of the injection-molded product. Is more preferable, 95% by mass or more is further preferable, and it may be 100% by mass.
  • the injection-molded article of the present embodiment contains at least one thermoplastic resin (hereinafter referred to as "resin (Tr1)”) selected from the group consisting of polypropylene and liquid crystal polyester.
  • resin (Tr1) thermoplastic resin selected from the group consisting of polypropylene and liquid crystal polyester.
  • liquid crystal polyester is preferably used because it has higher heat resistance and dimensional accuracy.
  • the liquid crystal polyester contained in the injection-molded product of the present embodiment is a polyester that exhibits liquid crystallinity in a molten state, and is preferably melted at a temperature of 400 ° C. or lower.
  • the liquid crystal polyester contained in the injection-molded product of the present embodiment may be a liquid crystal polyester amide, a liquid crystal polyester ether, a liquid crystal polyester carbonate, or a liquid crystal polyesterimide. It may be.
  • the liquid crystal polyester contained in the injection-molded product of the present embodiment is preferably a fully aromatic liquid crystal polyester using only an aromatic compound as a raw material monomer.
  • a typical example of the liquid crystal polyester contained in the injection-molded product of the present embodiment consists of a group consisting of an aromatic hydroxycarboxylic acid, an aromatic dicarboxylic acid, an aromatic diol, an aromatic hydroxyamine, and an aromatic diamine.
  • Polymerized (hypercondensed) with at least one selected compound polymerized with multiple aromatic hydroxycarboxylic acids; aromatic dicarboxylic acids and aromatic diols, aromatic hydroxyamines and Examples thereof include those obtained by polymerizing at least one compound selected from the group consisting of aromatic diamines; and those obtained by polymerizing a polyester such as polyethylene terephthalate and an aromatic hydroxycarboxylic acid.
  • aromatic hydroxycarboxylic acid, the aromatic dicarboxylic acid, the aromatic diol, the aromatic hydroxyamine, and the aromatic diamine are independently used in place of a part or all of them, and a polymerizable derivative thereof is used. May be good.
  • Examples of polymerizable derivatives of compounds having a carboxyl group are those obtained by converting a carboxyl group into an alkoxycarbonyl group or an aryloxycarbonyl group (ester), carboxyl. Examples thereof include those obtained by converting a group into a haloformyl group (acid halide) and those obtained by converting a carboxyl group into an acyloxycarbonyl group (acid anhydride).
  • Examples of polymerizable derivatives of compounds having a hydroxyl group such as aromatic hydroxycarboxylic acids, aromatic diols and aromatic hydroxyamines, are those obtained by acylating a hydroxyl group into an acyloxyl group (acylated product).
  • the liquid crystal polyester contained in the injection-molded product of the present embodiment preferably has a repeating unit represented by the following formula (1) (hereinafter, may be referred to as “repetition unit (1)”), and the repeating unit ( 1), a repeating unit represented by the following formula (2) (hereinafter sometimes referred to as “repetition unit (2)”), and a repeating unit represented by the following formula (3) (hereinafter referred to as “repetition unit (3)”). ) ”), It is more preferable to have.
  • Ar 1 represents a phenylene group, a naphthylene group or a biphenylylene group.
  • Ar 2 and Ar 3 independently represent a phenylene group, a naphthylene group, a biphenylylene group or a group represented by the following formula (4).
  • Y each independently represent an oxygen atom or an imino group (-NH-).
  • the hydrogen atom in the group represented by Ar 1 , Ar 2 or Ar 3 independently represents a halogen atom or an alkyl group, respectively. Alternatively, it may be substituted with an aryl group.
  • Ar 4 and Ar 5 independently represent a phenylene group or a naphthylene group.
  • Z represents an oxygen atom, a sulfur atom, a carbonyl group, a sulfonyl group or an alkylidene group.
  • halogen atom examples include a fluorine atom, a chlorine atom, a bromine atom and an iodine atom.
  • alkyl group examples include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, s-butyl group, t-butyl group, n-hexyl group and 2-ethylhexyl group.
  • examples thereof include an n-octyl group and an n-decyl group, and the number of carbon atoms thereof is preferably 1 to 10.
  • aryl group examples include a phenyl group, an o-tolyl group, an m-tolyl group, a p-tolyl group, a 1-naphthyl group and a 2-naphthyl group, and the number of carbon atoms thereof is preferably 6 to 20.
  • the number is preferably 2 or less, more preferably 1 or less, independently for each of the groups represented by Ar 1 , Ar 2 or Ar 3. preferable.
  • alkylidene group examples include a methylene group, an ethylidene group, an isopropylidene group, an n-butylidene group and a 2-ethylhexylidene group, and the carbon number thereof is preferably 1 to 10.
  • the repeating unit (1) is a repeating unit derived from a predetermined aromatic hydroxycarboxylic acid.
  • Ar 1 is a 1,4-phenylene group (repeating unit derived from p-hydroxybenzoic acid), and Ar 1 is a 2,6-naphthylene group (6-hydroxy).
  • a repeating unit derived from -2-naphthoic acid) is preferred.
  • oil means that the chemical structure of the functional group that contributes to the polymerization changes due to the polymerization of the raw material monomer, and no other structural change occurs.
  • the repeating unit (2) is a repeating unit derived from a predetermined aromatic dicarboxylic acid.
  • Ar 2 is a 1,4-phenylene group (repeating unit derived from terephthalic acid) and Ar 2 is a 1,3-phenylene group (repeating unit derived from isophthalic acid).
  • Ar 2 is a 2,6-naphthylene group (repetitive unit derived from 2,6-naphthalenedicarboxylic acid)
  • Ar 2 is a diphenyl ether-4,4'-diyl group (diphenyl).
  • a repeating unit derived from ether-4,4'-dicarboxylic acid) is preferred.
  • the repeating unit (3) is a repeating unit derived from a predetermined aromatic diol, aromatic hydroxylamine or aromatic diamine.
  • Ar 3 is a 1,4-phenylene group (a repeating unit derived from hydroquinone, p-aminophenol or p-phenylenediamine), and Ar 3 is a 4,4'-biphenylylene group. (Repeat unit derived from 4,4'-dihydroxybiphenyl, 4-amino-4'-hydroxybiphenyl or 4,4'-diaminobiphenyl) is preferred.
  • the content of the repeating unit (1) is the total amount of all repeating units (by dividing the mass of each repeating unit constituting the liquid crystal polyester by the formula amount of each repeating unit, the amount equivalent to the amount of substance of each repeating unit ( 30 mol% or more is preferable, 30 mol% or more and 80 mol% or less is more preferable, 40 mol% or more and 70 mol% or less is further preferable, and 45 mol% or more is preferable with respect to the total value). 65 mol% or less is particularly preferable.
  • the content of the repeating unit (2) is preferably 35 mol% or less, more preferably 10 mol% or more and 35 mol% or less, still more preferably 15 mol% or more and 30 mol% or less, based on the total amount of all repeating units. , 17.5 mol% or more and 27.5 mol% or less are particularly preferable.
  • the content of the repeating unit (3) is preferably 35 mol% or less, more preferably 10 mol% or more and 35 mol% or less, still more preferably 15 mol% or more and 30 mol% or less, based on the total amount of all repeating units. , 17.5 mol% or more and 27.5 mol% or less are particularly preferable. However, the total amount of the repeating units (1), (2) and (3) does not exceed 100 mol%.
  • the ratio between the content of the repeating unit (2) and the content of the repeating unit (3) is expressed by [content of repeating unit (2)] / [content of repeating unit (3)] (mol / mol). Therefore, 0.9 / 1 to 1 / 0.9 is preferable, 0.95 / 1 to 1 / 0.95 is more preferable, and 0.98 / 1 to 1 / 0.98 is even more preferable.
  • the liquid crystal polyester contained in the injection-molded product of the present embodiment may have two or more repeating units (1) to (3) independently of each other. Further, the liquid crystal polyester may have a repeating unit other than the repeating units (1) to (3), but the content thereof is preferably 10 mol% or less with respect to the total amount of all repeating units. More preferably, it is 5 mol% or less.
  • the liquid crystal polyester contained in the injection-molded article of the present embodiment has a repeating unit (3) in which X and Y are oxygen atoms, respectively, that is, a repeating unit derived from a predetermined aromatic diol. This is preferable because the melt viscosity tends to be low, and it is more preferable to have only those in which X and Y are oxygen atoms as the repeating unit (3).
  • the liquid crystal polyester contained in the injection-molded product of the present embodiment is obtained by melt-polymerizing a raw material monomer corresponding to a repeating unit constituting the same, and solidifying the obtained polymer (hereinafter, may be referred to as “prepolymer”). It is preferably produced by phase polymerization. As a result, a high molecular weight liquid crystal polyester having high heat resistance, strength and rigidity can be produced with good operability.
  • the melt polymerization may be carried out in the presence of a catalyst.
  • this catalyst examples include metal compounds such as magnesium acetate, stannous acetate, tetrabutyl titanate, lead acetate, sodium acetate, potassium acetate and antimony trioxide, 4- (dimethylamino) pyridine, 1-methylimidazole and the like.
  • metal compounds such as magnesium acetate, stannous acetate, tetrabutyl titanate, lead acetate, sodium acetate, potassium acetate and antimony trioxide, 4- (dimethylamino) pyridine, 1-methylimidazole and the like.
  • the nitrogen-containing heterocyclic compound of the above is mentioned, and the nitrogen-containing heterocyclic compound is preferably used.
  • the flow start temperature of the liquid crystal polyester contained in the injection-molded product of the present embodiment is preferably 260 ° C. or higher, more preferably 260 ° C. or higher and 400 ° C. or lower, and even more preferably 260 ° C. or higher and 380 ° C. or lower.
  • the higher the flow start temperature of the liquid crystal polyester the more the heat resistance and strength of the liquid crystal polyester tend to improve.
  • the flow start temperature of the liquid crystal polyester exceeds 400 ° C., the melting temperature and the melting viscosity of the liquid crystal polyester tend to increase. Therefore, the temperature required for molding the liquid crystal polyester tends to increase.
  • the flow start temperature of the liquid crystal polyester is also referred to as a flow temperature or a flow temperature, and is a temperature that serves as a guideline for the molecular weight of the liquid crystal polyester (edited by Naoyuki Koide, "Liquid Crystal Polymer-Synthesis / Molding / Application”. -”, CMC Co., Ltd., June 5, 1987, p.95).
  • the flow start temperature is a nozzle with an inner diameter of 1 mm and a length of 10 mm, in which the liquid polyester is melted while raising the temperature at a rate of 4 ° C./min under a load of 9.8 MPa (100 kg / cm 2 ) using a capillary rheometer. It is a temperature showing a viscosity of 4800 Pa ⁇ s (48000 poisons) when extruded from.
  • the liquid crystal polyester may be used alone or in combination of two or more.
  • two or more kinds of liquid crystal polyesters are used in combination, it is preferable to use those having different flow start temperatures in combination as described later.
  • the proportion of the resin (Tr1) in the thermoplastic resin contained in the injection-molded article of the present embodiment is 10% by mass or more, and 25% by mass or more, based on the total amount (100% by mass) of the thermoplastic resin.
  • the content of the resin (Tr1) in the injection-molded product of the present embodiment is preferably 65 to 95% by mass, more preferably 65 to 90% by mass, based on the total amount (100% by mass) of the injection-molded product. 65-85% by mass is more preferable.
  • the injection-molded product of the present embodiment may contain a thermoplastic resin other than the resin (Tr1) in addition to the resin (Tr1).
  • thermoplastic resins other than the resin (Tr1) include polyamides such as nylon 66 (PA66) and nylon 6 (PA6), polyesters other than liquid crystal polyester, polysulfone, polyethersulfone, polyphenylene sulfide, polyetherketone, and polyetherether. Examples thereof include ketones, polycarbonates, polyphenylene ethers, and polyetherimides.
  • the proportion of the thermoplastic resin other than the resin (Tr1) in the thermoplastic resin contained in the injection-molded product of the present embodiment is, for example, 0 to 25% by mass with respect to the total amount (100% by mass) of the thermoplastic resin. Yes, it may be 0 to 10% by mass.
  • the fibrous filler contained in the injection-molded article of the present embodiment may be a fibrous inorganic filler or a fibrous organic filler.
  • the fibrous inorganic filler glass fibers; carbon fibers such as PAN-based, pitch-based, rayon-based, phenol-based, and lignin-based carbon fibers; ceramic fibers such as silica fibers, alumina fibers, and silica-alumina fibers; iron and gold. , Copper, aluminum, brass, stainless steel and other metal fibers; silicon carbide fibers, boron fibers and the like.
  • the fibrous inorganic filler include whiskers such as potassium titanate whiskers, barium titanate whiskers, wollastonite whiskers, aluminum borate whiskers, silicon nitride whiskers, and silicon carbide whiskers.
  • the fibrous organic filler include polyester fibers, para or metaaramid fibers, and PBO fibers.
  • At least one selected from the group consisting of carbon fibers and glass fibers such as PAN-based or pitch-based fillers is more preferable as the fibrous filler.
  • a fibrous filler coated with a metal such as nickel, copper or ytterbium may be used for the purpose of imparting conductivity.
  • the tensile strength of the carbon fiber is preferably 2000 MPa or more, more preferably 3000 MPa or more, and further preferably 4000 MPa or more.
  • the tensile elongation of the carbon fiber is preferably 0.5% or more, more preferably 1.0% or more, still more preferably 1.8% or more.
  • PAN-based carbon fibers can be preferably used because they have a good balance of tensile strength, tensile elastic modulus, and tensile elongation, and can leave a long residual fiber length.
  • the tensile strength, tensile elastic modulus, and tensile elongation of the carbon fibers mean values measured in accordance with JIS R 7606: 2000.
  • Examples of the PAN-based carbon fiber include “Treca (registered trademark)” manufactured by Toray Industries, Inc., “Pyrofil (registered trademark)” manufactured by Mitsubishi Chemical Corporation, and “Tenax (registered trademark)” manufactured by Teijin Limited.
  • Examples of pitch-based carbon fibers include “Dialed (registered trademark)” manufactured by Mitsubishi Chemical Corporation, “GRANOC (registered trademark)” manufactured by Nippon Graphite Fiber Co., Ltd., and “Donna Carbo (registered trademark)” manufactured by Osaka Gas Chemical Corporation. Examples include “Kureka (registered trademark)” manufactured by Kureha Co., Ltd.
  • Glass fibers include E glass (ie, non-alkali glass), S glass or T glass (ie, high strength, high elasticity glass), C glass (ie, glass for acid resistant applications), D glass (ie, low dielectric constant).
  • Glass fibers for FRP tempering materials such as ECR glass (ie, E-glass alternative glass that does not contain B 2 O 3 , F 2 ), AR glass (ie, glass for alkali-resistant applications).
  • E glass is particularly preferable. ..
  • the injection-molded product of the present embodiment may contain one or more other fillers, additives and the like, if necessary.
  • the other filler may be a plate-shaped filler, a spherical filler or other granular filler.
  • the other filler may be an inorganic filler or an organic filler.
  • Examples of the plate-shaped inorganic filler include talc, mica, graphite, wollastonite, glass flakes, barium sulfate, and calcium carbonate.
  • the mica may be muscovite, phlogopite, fluorine phlogopite, or tetrasilicon mica.
  • Examples of the granular inorganic filler include silica, alumina, titanium oxide, glass beads, glass balloons, boron nitride, silicon carbide, and calcium carbonate.
  • Additives include metering stabilizers, flame retardants, conductivity-imparting materials, crystal nucleating agents, UV absorbers, antioxidants, vibration damping agents, antibacterial agents, insect repellents, deodorants, anticoloring agents, and heat stabilizers. Examples thereof include agents, mold release agents, antistatic agents, plasticizers, lubricants, colorants, pigments, dyes, foaming agents, antifoaming agents, viscosity modifiers, and surfactants.
  • the standard deviation of the fibrous filler filling amount variation in the injection-molded product that is, the injection-molded product, which is determined from the following [Measurement of fibrous filler filling amount variation (a)].
  • the standard deviation of the filling amount of the fibrous filler inside exceeds 1.0% by mass.
  • S Standard deviation
  • S 2 Dispersion
  • n Total number of 5 mm square test pieces
  • x i Filling amount of each fibrous filler in the 5 mm square test piece (that is, the ratio of the mass of the fibrous filler to the mass of the 5 mm square test piece [mass%])
  • X Average value of 8 points of filling amount of fibrous filler
  • the thickness of the 5 mm square test piece is assumed to be 5 mm or less, and if there is a portion where the thickness of the injection molded product exceeds 5 mm, it is cut out in a length of 10 mm ⁇ a width of 20 mm.
  • Eight 5 mm squares are cut out from a processed product having a thickness of 5 mm or less and a difference between the maximum and minimum thickness values of 0.5 mm or less, and used as a test piece.
  • the filling amount of the fibrous filler (that is, the ratio of the mass of the fibrous filler to the mass of the 5 mm square test piece [mass%]) is measured as follows.
  • Procedure (1) The mass (m 0 ) of the test piece cut into a 5 mm square and the mass (M 1 ) of the crucible are measured up to 0.1 mg unit with a precision balance.
  • Procedure (2) The test piece is placed in the crucible and heated in a muffle furnace at 600 ° C. for 4 hours to remove the resin component.
  • the fibrous filler is made of silica fiber, ceramic fiber such as alumina fiber, or fibrous inorganic filling such as potassium titanate whisker or barium titanate whisker. It can also be used when it is a material.
  • Procedure (1) The mass (m 0 ) of the test piece cut into a 5 mm square and the mass (M 1 ) of the filter paper are measured up to 0.1 mg unit with a precision balance.
  • the above-mentioned method for measuring the filling amount when the fibrous filler is carbon fiber can also be used when the fibrous filler is a metal fiber such as iron, aluminum or stainless steel, a silicon carbide fiber or a boron fiber.
  • the standard deviation of the filling amount of the fibrous filler in the injection-molded product preferably exceeds 1.0% by mass, preferably 1.1% by mass or more, and more preferably 1.2% by mass or more. It is preferably 1.5% by mass or more, and more preferably 1.5% by mass or more.
  • the upper limit of the standard deviation of the filling amount of the fibrous filler in the injection-molded product is, for example, preferably 5% by mass or less, and more preferably 4% by mass or less.
  • the standard deviation of the filling amount of the fibrous filler in the injection molded product is preferably 1.1% by mass or more and 5% by mass or less, more preferably 1.2% by mass or more and 4% by mass or less, and 1.5% by mass. More preferably 4% by mass or less.
  • the standard deviation of the filling amount of the fibrous filler in the injection-molded product is equal to or more than the lower limit of the above range, the strength of the injection-molded product, particularly against a collision load, is increased.
  • it is not more than the upper limit value of the above-mentioned preferable range the fibrous filler is well dispersed in the injection-molded product, and the strength difference between the parts of the molded product is unlikely to occur.
  • the maximum difference in the fibrous filler filling amount variation in the injection-molded product that is, the said, as determined from the following [Measurement of fibrous filler filling amount variation (b)]. It is preferable that the maximum difference in the filling amount of the fibrous filler in the injection-molded product exceeds 3.0% by mass.
  • the thickness of the 5 mm square test piece is assumed to be 5 mm or less, and if there is a portion where the thickness of the injection molded product exceeds 5 mm, it is cut out in a length of 10 mm ⁇ a width of 20 mm.
  • Eight 5 mm squares are cut out from a processed product having a thickness of 5 mm or less and a difference between the maximum and minimum thickness values of 0.5 mm or less, and used as a test piece.
  • the maximum difference in the filling amount of the fibrous filler in the injection molded product is preferably more than 3.0% by mass, more preferably 4% by mass or more, and more preferably 5% by mass or more. Those having an amount of 5.5% by mass or more are particularly preferable, and those having an amount of 6% by mass or more are most preferable.
  • the upper limit of the maximum difference in the filling amount of the fibrous filler in the injection-molded product is, for example, preferably 10% by mass or less, and more preferably 9% by mass or less.
  • the maximum difference in the filling amount of the fibrous filler in the injection-molded product is preferably more than 3.0% by mass and 10% by mass or less, and more preferably 4% by mass or more and 9% by mass or less. It is more preferably 5% by mass or more and 9% by mass or less, further preferably 5.5% by mass or more and 9% by mass or less, and particularly preferably 6% by mass or more and 9% by mass or less.
  • the maximum difference in the filling amount of the fibrous filler in the injection-molded product is equal to or more than the lower limit of the above-mentioned preferable range, the strength of the injection-molded product against a collision load is likely to be increased.
  • the fibrous filler is satisfactorily dispersed in the injection-molded product, and the strength difference between the parts of the molded product is less likely to occur.
  • the fibrous filler in the injection-molded product of the present embodiment preferably has a length-weighted average fiber length of 4 mm or more, more preferably a length-weighted average fiber length of 4.5 mm or more, and a length-weighted average fiber length. 5 mm or more is more preferable, a length-weighted average fiber length of 5.5 mm or more is particularly preferable, and a length-weighted average fiber length of 6 mm or more is most preferable.
  • the fibrous filler preferably has a length-weighted average fiber length of less than 50 mm, more preferably a length-weighted average fiber length of 40 mm or less, and even more preferably a length-weighted average fiber length of 20 mm or less.
  • a weighted average fiber length of 15 mm or less is particularly preferable.
  • the length-weighted average fiber length of the fibrous filler is preferably 4 mm or more and less than 50 mm, more preferably 4.5 mm or more and 40 mm or less, and further preferably 5 mm or more and 20 mm or less. It is more preferably 5 mm or more and 15 mm or less, and particularly preferably 6 mm or more and 15 mm or less.
  • the length-weighted average fiber length of the fibrous filler is at least the lower limit of the above-mentioned preferable range, the strength against a collision load is further increased. On the other hand, when it is not more than the upper limit value of the above-mentioned preferable range, molding becomes easier.
  • the fiber length and length-weighted average fiber length of the fibrous filler in the injection-molded product are measured as follows.
  • Procedure (1) A test piece having a width of 10 mm, a length of 30 mm, and a thickness of 4 mm is cut out from the injection-molded product and heated in a muffle furnace to remove the resin component.
  • the heating conditions are 500 ° C. for 3 hours.
  • the heating conditions are 600 ° C. for 4 hours.
  • Procedure (2) A dispersion is prepared by dispersing the injection-molded product from which the resin component has been removed in 1000 mL of an aqueous solution containing 0.05% by volume of a surfactant (Micro90 INTERRNATIONAL PRODUCTS CORPORATION).
  • Procedure (3) Take out 100 mL from the dispersion and dilute it 5 to 20 times with pure water. A part is taken out from the diluted dispersion, the fibers are observed with a microscope (VH-ZST (manufactured by KEYENCE) at a magnification of 20 times), and 10 images are taken per sample so that the imaging areas do not overlap. To do.
  • VH-ZST manufactured by KEYENCE
  • the fibrous filler is carbon fiber
  • 50 mL is taken out from the diluted dispersion, filtered under reduced pressure using a filter paper for Kiriyama funnel (No. 5C) having a diameter of 90 mm, and an image of the carbon fiber dispersed in the filter paper is obtained.
  • a filter paper for Kiriyama funnel No. 5C
  • an image of the carbon fiber dispersed in the filter paper is obtained.
  • the fibrous filler is glass fiber
  • 50 mL is removed from the diluted dispersion, dispersed in a petri dish, and then an image of the glass fiber dispersed in the petri dish is taken.
  • li Fiber length of fibrous filler ni: Number of fibrous fillers of fiber length li
  • the proportion of the fibrous filler having a fiber length of 1 mm or less in the injection-molded product of the present embodiment is preferably 40% by mass or less with respect to the total amount (100% by mass) of the fibrous filler in the injection-molded product. It is more preferably 30% by mass or less, further preferably 25% by mass or less, and particularly preferably 20% by mass or less.
  • the smaller the proportion of the fibrous filler having a fiber length of 1 mm or less is preferable, but the lower limit thereof is, for example, 1% by mass or more, or 2% by mass or more.
  • the proportion of the fibrous filler having a fiber length of 1 mm or less is preferably 1% by mass or more and 40% by mass or less, more preferably 1% by mass or more and 30% by mass or less, and 1% by mass or more and 25. It is more preferably 2% by mass or less, and particularly preferably 2% by mass or more and 20% by mass or less.
  • the ratio of the fibrous filler having a fiber length of 1 mm or less is within the above-mentioned preferable range, when an impact is applied to the molded product, the progress of cracks in the molded product is suppressed and the strength against a collision load is increased. It will be easier to raise.
  • the proportion of the fibrous filler having a fiber length of more than 5 mm in the injection-molded product of the present embodiment is preferably 30% by mass or more with respect to the total amount (100% by mass) of the fibrous filler in the injection-molded product. Yes, more preferably 35% by mass or more, further preferably 40% by mass or more, and particularly preferably 45% by mass or more.
  • the proportion of the fibrous filler having a fiber length of more than 5 mm is preferably larger, but the upper limit thereof is, for example, 90% by mass or less, or 80% by mass or less.
  • the proportion of the fibrous filler having a fiber length of more than 5 mm is preferably 30% by mass or more and 90% by mass or less, more preferably 35% by mass or more and 90% by mass or less, and further preferably 40% by mass or more and 90% by mass or less. Especially preferably 45% by mass or more and 80% by mass or less.
  • the proportion of the fibrous filler having a fiber length of more than 5 mm is within the above-mentioned preferable range, energy consumption is effectively achieved by pulling out the fibrous filler from the matrix resin when an impact is applied to the molded product. Therefore, it becomes easier to increase the strength against the collision load.
  • the injection-molded product of the present embodiment contains 65 to 95 parts by mass of the thermoplastic resin and 5 to 35 parts by mass of the fibrous filler.
  • the injection-molded product of the present embodiment contains at least one selected from the group consisting of polypropylene and liquid crystal polyester in an amount of 10% by mass or more based on the total amount of the thermoplastic resin. That is, in the present embodiment, since polypropylene or liquid crystal polyester exhibits appropriate adhesion to the fibrous filler, when an impact is applied to the injection-molded product, cracks in the injection-molded product occur in the fibrous filler breaking direction. Instead, it tends to extend in the longitudinal direction of the fibrous filler (the direction along the interface between the fibrous filler and the matrix resin).
  • the fibrous filler is drawn out from the matrix resin, and energy is effectively consumed at that time, so that it is presumed that the strength against the collision load is increased.
  • the injection-molded product of the present embodiment has a standard deviation of the filling amount of the fibrous filler exceeding 1.0% by mass, which is determined from a specific [Measurement of variation in the filling amount of the fibrous filler (a)]. Is. That is, in the present embodiment, the fibrous filler is not excessively opened in the injection-molded product and is appropriately dispersed in the state of a fiber bundle (the variation in the fiber concentration in the injection-molded product is relatively large). ). Further, since the fiber bundle is appropriately present in the injection-molded product, fiber breakage is suppressed. Therefore, it is presumed that the injection-molded product of the present embodiment has increased strength against a collision load.
  • the injection-molded product of the present invention has the following aspects.
  • thermoplastic resin is at least selected from the group consisting of polypropylene and liquid crystal polyester.
  • One type is contained in an amount of 10% by mass or more based on the total amount of the thermoplastic resin, and the filling amount of the fibrous filler in the injection-molded product is determined from the following [Measurement of variation in fibrous filler filling amount (a)].
  • thermoplastic resin is at least selected from the group consisting of polypropylene and liquid crystal polyester.
  • One type is contained in an amount of 50 to 100% by mass based on the total amount of the thermoplastic resin, and the filling of the fibrous filler in the injection-molded product, which is determined from the above [Measurement of variation in fibrous filler filling amount (a)].
  • An injection-molded article having a standard deviation of amount of 1.1% by mass or more and 5% by mass or less.
  • thermoplastic resin is at least selected from the group consisting of polypropylene and liquid crystal polyester.
  • One type is contained in an amount of 75 to 100% by mass based on the total amount of the thermoplastic resin, and the filling of the fibrous filler in the injection-molded product is determined from the above [Measurement of variation in fibrous filler filling amount (a)].
  • An injection-molded article having a standard deviation of 1.2% by mass or more and 4% by mass or less.
  • thermoplastic resin is at least selected from the group consisting of polypropylene and liquid crystal polyester.
  • One type is contained in an amount of 90 to 100% by mass based on the total amount of the thermoplastic resin, and the filling of the fibrous filler in the injection-molded product is determined from the above [Measurement of variation in fibrous filler filling amount (a)].
  • An injection-molded article having a standard deviation of 1.5% by mass or more and 4% by mass or less.
  • thermoplastic resin is a liquid crystal polyester in the total amount of the thermoplastic resin.
  • standard deviation of the filling amount of the fibrous filler in the injection-molded product which contains 20 to 100% by mass and is determined from the above [Measurement of variation in fibrous filler filling amount (a)] is 1.4% by mass.
  • the standard deviation is more than 1.0% by mass and 5% by mass or less, preferably 1.1% by mass or more and 5% by mass or less, and more preferably 1.2% by mass or more and 4% by mass or less.
  • thermoplastic resin contains at least one selected from the group consisting of polypropylene and liquid crystal polyester in an amount of 50 to 100% by mass, preferably 75 to 100% by mass, based on the total amount of the thermoplastic resin.
  • thermoplastic resin contains liquid crystal polyester in an amount of 10% by mass or more based on the total amount of the thermoplastic resin.
  • thermoplastic resin contains 50 to 100% by mass, preferably 75 to 100% by mass, and more preferably 90 to 100% by mass of the liquid crystal polyester with respect to the total amount of the thermoplastic resin.
  • the total content of the thermoplastic resin and the fibrous filler is 80% by mass or more, preferably 90% by mass or more, more preferably 95, based on the total amount of the injection-molded product.
  • the injection-molded product contains 65 to 90 parts by mass of a thermoplastic resin and 10 to 35 parts by mass of a fibrous filler, preferably 65 to 85 parts by mass of a thermoplastic resin and 15 to 35 parts by mass of a fibrous filler.
  • the injection-molded product according to any one of "1" to "10", which contains a part by mass.
  • the length-weighted average fiber length of the fibrous filler is 4 mm or more and less than 50 mm, preferably 4.5 mm or more and 40 mm or less, more preferably 5 mm or more and 20 mm or less, and further preferably 5.5 mm.
  • the injection-molded product according to "15" which is 15 mm or more, and particularly preferably 6 mm or more and 15 mm or less.
  • the maximum difference in the filling amount of the fibrous filler in the injection-molded product which is determined from the [Measurement of variation in the filling amount of the fibrous filler (b)], exceeds 3.0% by mass and is 10% by mass. It is less than or equal to, preferably 4% by mass or more and 9% by mass or less, more preferably 5% by mass or more and 9% by mass or less, still more preferably 5.5% by mass or more and 9% by mass or less, and particularly preferably.
  • the injection-molded product according to the above "18" which is 6% by mass or more and 9% by mass or less.
  • the injection-molded article of the above-described embodiment is a thermoplastic resin composition (molding) prepared by mixing 65 to 95 parts by mass of a thermoplastic resin, 5 to 35 parts by mass of a fibrous filler, and other components as necessary.
  • the material can be produced by injection molding.
  • thermoplastic resin composition the mixture obtained by mixing the thermoplastic resin and the fibrous filler is referred to as a "thermoplastic resin composition”.
  • thermoplastic resin composition a molding material for producing an injection-molded product obtained by preparing the obtained mixture in the form of pellets is also referred to as a “thermoplastic resin composition”.
  • the method for producing an injection-molded product of the present embodiment is a method for producing the above-mentioned (injection-molded product), in which the first pellet impregnated with the fibrous filler by the first thermoplastic resin and the fibrous A step of mixing with a second pellet containing a second thermoplastic resin which does not contain a filler and has a lower flow start temperature than the first thermoplastic resin to obtain a pellet mixture, and injection of the pellet mixture. Has a molding process.
  • Step to obtain pellet mixture In the step of obtaining the pellet mixture in the present embodiment, the first pellet and the second pellet are mixed to obtain a pellet mixture.
  • the first pellet comprises a resin structure in which the first thermoplastic resin is impregnated with the fibrous filler.
  • the first pellet is made into a fibrous form by, for example, impregnating a fibrous filler with a melt obtained by melt-kneading the first thermoplastic resin and other components if necessary, and pelletizing the first pellet.
  • the filler is obtained as pellets in a state of being solidified with the first thermoplastic resin.
  • Examples of the shape of the first pellet include, and are not limited to, a columnar shape, a disk shape, an elliptical columnar shape, an elliptical disk shape, a go stone shape, a spherical shape, and an indefinite shape. Cylindrical is more preferable from the viewpoint of productivity and handling at the time of molding.
  • FIG. 1 shows an embodiment of a first pellet manufacturing apparatus.
  • the first thermoplastic resin composition is composed of a fiber roving 10 in which a plurality of fibrous fillers are wound into a roll of fiber bundles 11 converged by a converging agent. The case where the pellet 15 is obtained will be described.
  • the manufacturing apparatus 100 includes a preheating unit 121, an impregnation unit 123, a cooling unit 125, a take-up unit 127, a cutting unit 129, and transfer rolls 101 to 109.
  • the extruder 120 is connected to the impregnation unit 123.
  • FIG. 1 shows how the fiber bundle 11 is continuously fed out from the fiber roving 10.
  • the pellet 15 made of the first thermoplastic resin composition is produced while the fiber bundle 11 unwound from the fiber roving 10 is conveyed in the longitudinal direction by the conveying rolls 101 to 109.
  • the fineness of the fiber roving 10 used in the production of the first pellet of the present embodiment is not particularly limited, but is preferably 200 g / 1000 m or more, more preferably 500 g / 1000 m or more, still more preferably 800 g / 1000 m or more.
  • the fineness of the fiber roving 10 is preferably 3750 g / 1000 m or less, more preferably 3200 g / 1000 m or less, and even more preferably 2500 g / 1000 m or less.
  • the fineness of the fiber roving 10 is not more than the upper limit of the above-mentioned preferable range, the fibers are likely to be dispersed in the first thermoplastic resin. In addition, the fibers are easy to handle during the production of the first pellet. That is, the fineness of the fiber roving 10 is preferably 200 g / 1000 m or more and 3750 g / 1000 m or less, and more preferably 800 g / 1000 m or more and 2500 g / 1000 m or less.
  • the number average fiber diameter of the fiber roving 10 is not particularly limited, but is preferably 1 to 40 ⁇ m, and more preferably 3 to 35 ⁇ m.
  • the number average fiber diameter of the fiber roving 10 is preferably 1 to 15 ⁇ m, more preferably 3 to 10 ⁇ m, and further preferably 4 to 9 ⁇ m.
  • the number average fiber diameter of the fiber roving 10 is preferably 5 to 35 ⁇ m, more preferably 10 to 25 ⁇ m, and even more preferably 10 to 20 ⁇ m.
  • the number average fiber diameter of the fiber roving 10 is the number average value obtained by observing the fibrous filler with a scanning electron microscope (1000 times) and measuring the fiber diameter of 500 randomly selected fibrous fillers. adopt.
  • the number average fiber diameter of the fiber roving 10 is at least the lower limit of the above-mentioned preferable range, the fibrous filler is likely to be dispersed in the first pellet. In addition, the fibrous filler can be easily handled during the production of the first pellet.
  • the molded product is efficiently strengthened by the fibrous filler. Therefore, excellent Charpy impact strength can be imparted to the injection-molded product of the present embodiment.
  • the fibrous filler treated with a converging agent is used.
  • a fibrous filler that has been appropriately sized is superior in productivity and quality stability during pellet production, and can reduce variations in physical properties in the molded product.
  • the converging agent is not particularly limited, and examples thereof include nylon-based polymers, polyether-based polymers, epoxy-based polymers, ester-based polymers, urethane-based polymers, mixed polymers thereof, and modified polymers thereof. Be done. Further, a so-called silane coupling agent such as aminosilane or epoxysilane, or a known coupling agent such as a titanium coupling agent can also be used.
  • the single fibers do not necessarily have to be arranged in one direction, but from the viewpoint of productivity in the process of manufacturing the molding material, the single fibers are on one side. It is preferable that the fibers are arranged in the same manner and the fiber bundles are continuous in the length direction of the fibers.
  • the number of single threads of the fiber roving 10 is preferably 1000 or more and 10000 or less, more preferably 1000 or more and 8000 or less, and 1500 or more and 6000 from the viewpoint of economy and improvement of impregnation. The following is more preferable.
  • the number of single threads of the fiber roving 10 is preferably 10,000 or more and 100,000 or less, more preferably 10,000 or more and 50,000 or less, and 10,000 or more and 30,000 or less from the same viewpoint. More preferred.
  • the fiber bundle 11 unwound from the fiber roving 10 is heated and dried.
  • the heating temperature at that time is not particularly limited, but is, for example, 50 to 250 ° C.
  • the heating time in the preheating unit 121 is not particularly limited, but is, for example, 3 to 30 seconds.
  • the fiber bundle 11 is impregnated with a molding material M (first thermoplastic resin, other components to be blended if necessary) other than the fiber bundle 11.
  • first thermoplastic resin is preferably selected as appropriate in consideration of the type of the second thermoplastic resin, the melt viscosity, the flow start temperature, and the like.
  • liquid crystal polyester and polypropylene are preferably used as the first thermoplastic resin.
  • the first thermoplastic resin may be used alone or in combination of two or more.
  • the fiber bundle 11 may be impregnated with the melt obtained by charging the molding material M from the supply port 123a and heating in the impregnation portion 123, or the molding material M melt-kneaded by the extruder 120 is supplied. It may be charged from 123a and impregnated into the fiber bundle 11. Then, in the embodiment shown in FIG. 1, the resin structure 13 in which the fiber bundle 11 is impregnated and coated with the melt is obtained.
  • the heating temperature in the impregnating portion 123 is appropriately determined according to the type of the first thermoplastic resin, and is preferably set to a temperature 10 to 80 ° C. higher than the flow start temperature of the first thermoplastic resin to be used, for example. It is 300 to 400 ° C.
  • 100 parts by mass of the first thermoplastic resin is preferably 80 to 150 parts by mass of the fibrous filler (fiber bundle 11), more preferably fibrous, depending on the characteristics required for the molded product.
  • the filler is impregnated with 85 to 140 parts by mass, more preferably 90 to 130 parts by mass of the fibrous filler.
  • the blending amount of the fibrous filler is at least the lower limit value in the above-mentioned preferable range, the injection-molded product is efficiently strengthened by the fiber.
  • the value is not more than the upper limit of the above-mentioned preferable range, the fiber bundle can be easily opened and the first thermoplastic resin can be easily impregnated into the fiber bundle.
  • the cooling unit 125 cools the resin structure 13 (the resin structure 13 in which the fiber bundle 11 is impregnated and coated with the melt) heated by the impregnation unit 123 to, for example, 50 to 150 ° C.
  • the cooling time is not particularly limited, but is, for example, 3 to 30 seconds.
  • the take-up section 127 continuously picks up the resin structure 13 cooled by the cooling section 125 and feeds it to the next cutting section 129.
  • the cooled resin structure 13 is cut to a desired length to prepare pellets 15.
  • the cutting portion 129 includes, for example, a rotary blade.
  • the first pellet of the present embodiment for example, a pellet in which the fibrous filler is hardened with the first thermoplastic resin is manufactured as follows.
  • Step to obtain resin structure First, the preheating unit 121 heats and dries the fiber bundle 11 while continuously feeding out the fiber bundle 11 in which a plurality of single fibers are converged by the converging agent from the fiber roving 10. Next, while supplying the dried fiber bundle 11 to the impregnated portion 123, the molding material M melt-kneaded by the extruder 120 is charged from the supply port 123a, and the molten molding material M is charged into the fiber bundle 11. Impregnate. As a result, the resin structure 13 in which the fiber bundle 11 is impregnated and coated with the melt is obtained. After that, the resin structure 13 heated by the impregnated portion 123 is cooled by the cooling portion 125.
  • the fibers are arranged substantially parallel to the longitudinal direction of the resin structure 13.
  • the fibers are arranged substantially parallel to the longitudinal direction of the resin structure means that the angle formed by the longitudinal direction of the fibers and the longitudinal direction of the resin structure is approximately 0 °. Specifically, the fibers and the resin It shows a state where the angle formed by each of the longitudinal directions of the structure is -5 ° to 5 °.
  • Step to obtain pellets Next, the cooled resin structure 13 is taken up in a strand shape by the taking-up portion 127 and fed out to the cutting portion 129. Next, at the cutting portion 129, the strand-shaped resin structure 13 is cut to a predetermined length in the longitudinal direction thereof to obtain pellets 15.
  • the predetermined length of the pellet 15 referred to here is the length of the pellet 15 set according to the required performance of the molded product using the pellet 15 as a material.
  • the length of the pellet 15 and the length of the fibers arranged in the pellet 15 are substantially the same length. "The length of the pellet and the length of the fiber are substantially the same" means that the length-weighted average fiber length of the fibers arranged in the pellet is 95 to the length in the longitudinal direction of the pellet. It shows that it is 105%.
  • the first pellet (pellet 15) in which the fibrous filler is impregnated with the first thermoplastic resin is produced.
  • the fibrous filler is hardened with the first thermoplastic resin, and the fibrous filler is arranged substantially parallel to the longitudinal direction of the pellet.
  • the length of the fibrous filler arranged in the pellet 15 is substantially the same as the length of the pellet.
  • the length of the pellet 15 produced in the present embodiment is, for example, 3 to 50 mm, depending on the required performance of the molded product made of the pellet 15 as a material.
  • the length of the pellet means the length in the longitudinal direction of the pellet.
  • the fibrous fillers are arranged substantially parallel to the longitudinal direction of the pellets, and the length of the fibrous fillers is substantially the same as the length of the pellets, thereby forming an injection-molded product.
  • the residual fibrous filler in the injection-molded product can be made into long fibers, which is effective in improving the heat resistance of the molded product and alleviating anisotropy.
  • the arrangement direction of the fibrous filler in the pellet can be confirmed by observing the cross section of the pellet cut in the longitudinal direction with a microscope. Further, in the present embodiment, the fiber length and the length-weighted average fiber length of the fibrous filler in the pellet are measured by the following procedure.
  • Procedure (1) 2 g of pellets are heated in a muffle furnace to remove the resin component (first thermoplastic resin).
  • the heating conditions are 500 ° C. for 3 hours.
  • the heating conditions are 600 ° C. for 4 hours.
  • Procedure (2) A dispersion in which the resin component is removed from the pellet is dispersed in 1000 mL of an aqueous solution containing 0.05% by volume of a surfactant (Micro90, INTERENTIONAL PRODUCTS CORPORATION) to prepare a dispersion.
  • a surfactant Micro90, INTERENTIONAL PRODUCTS CORPORATION
  • Procedure (3) Take out 100 mL from the dispersion and dilute it 5 to 20 times with pure water. A part is taken out from the diluted dispersion, and the fibrous filler is observed with a microscope (VH-Z25, manufactured by KEYENCE, 10 to 20 times magnification) so that the imaging areas do not overlap with each sample. Take 10 pictures. However, when the fibrous filler is carbon fiber, 50 mL is taken out from the diluted dispersion, filtered under reduced pressure using a filter paper for Kiriyama funnel (No. 5C) having a diameter of 90 mm, and an image of the carbon fiber dispersed in the filter paper is obtained. Take a picture. If the fibrous filler is glass fiber, 50 mL is removed from the diluted dispersion, dispersed in a petri dish, and then an image of the glass fiber dispersed in the petri dish is taken.
  • VH-Z25 manufactured by KEYENCE, 10 to 20 times magnification
  • Procedure (4) Measure the lengths of all the fibers present in one captured image with a measuring tool of a microscope. It should be noted that the bent fibers are measured by multi-point measurement, and the fibers in contact with the edge of the image are not measured. The same operation is sequentially performed on the 10 captured images until the total number of measured fibers exceeds 500, and the fiber length is measured. If the total number of fibers in the 10 images taken does not exceed 500, return to step (3), adjust the dilution ratio with pure water as appropriate, retake the image, and remeasure the fiber length. To do.
  • li Fiber length of fibrous filler
  • ni Number of fibrous fillers of fiber length li
  • the second pellet is composed of a resin structure that does not contain the fibrous filler and contains a second thermoplastic resin having a lower flow start temperature than the first thermoplastic resin.
  • the second pellet is obtained, for example, by pelletizing a mixture of the second thermoplastic resin and, if necessary, other components by a melt extrusion molding method or a melt compression molding method.
  • the shape of the second pellet include, and are not limited to, a columnar shape, a disk shape, an elliptical columnar shape, an elliptical disk shape, a go stone shape, a spherical shape, and an indefinite shape. Cylindrical is more preferable from the viewpoint of productivity and handling at the time of molding.
  • the second thermoplastic resin having a lower flow start temperature than the first thermoplastic resin is used.
  • the difference in the flow start temperature between the second thermoplastic resin and the first thermoplastic resin is 5 ° C. or higher, more preferably 5 to 40 ° C.
  • the difference in the flow start temperature between the second thermoplastic resin and the first pellet is 5 ° C. or higher, more preferably 5 to 40 ° C.
  • the second thermoplastic resin preferably has a melt viscosity of the pellet mixture described later at the melt kneading temperature of 5 to 500 Pa ⁇ s (measurement conditions: nozzle hole diameter 0.5 mm, shear rate 1000 s -1 ).
  • the second thermoplastic resin a liquid crystal polyester, polypropylene, a polyamide such as nylon 66 (PA66) or nylon 6 (PA6), a polyester other than the liquid crystal polyester resin, polysulfone, polyethersulfone, polyphenylene sulfide, poly Examples thereof include ether ketone, polyether ether ketone, polycarbonate, polyphenylene ether, and polyetherimide.
  • the second thermoplastic resin may be used alone or in combination of two or more.
  • the first pellet and the second pellet described above are mixed to obtain a pellet mixture.
  • the mixing ratio (mass ratio) of the first pellet and the second pellet is 65 to 95 parts by mass of the thermoplastic resin and 5 to 35 parts by mass of the fibrous filler when the injection-molded product is prepared.
  • the first pellet and the second pellet may be mixed.
  • the mixing ratio (mass ratio) of the two is preferably 30 to 80 parts by mass of the first pellet and 20 to 70 parts by mass of the second pellet, and 35 to 75 parts by mass of the first pellet and 25 to 25 parts by mass of the second pellet. 65 parts by mass is more preferable, and 40 to 70 parts by mass of the first pellet and 30 to 60 parts by mass of the second pellet are further preferable.
  • the first pellet and the second pellet may be separately charged into the molding machine and mixed in the molding machine, or a mixture in which both may be mixed in advance may be prepared. Alternatively, the first pellet and the second pellet may be used as the surface of the first pellet coated with the second pellet.
  • a known injection molding machine is used to melt the pellet mixture, and the melted pellet mixture is injected into a mold for molding.
  • known injection molding machines include TR450EH3 manufactured by Sodick Co., Ltd. and PS40E5ASE type hydraulic horizontal molding machine manufactured by Nissei Resin Industry Co., Ltd.
  • the temperature condition of injection molding is appropriately determined according to the type of thermoplastic resin, and it is preferable to set the cylinder temperature of the injection molding machine to a temperature 10 to 80 ° C. higher than the flow start temperature of the thermoplastic resin to be used.
  • the melt-kneading temperature of the pellet mixture preferably exceeds the flow start temperature of the second thermoplastic resin and is equal to or lower than the flow start temperature of the first thermoplastic resin or the first pellet.
  • the melt-kneading temperature of the pellet mixture means a temperature at which the pellet mixture is melted or plasticized and kneaded, and specifically, the temperature of the plasticized portion of the injection molding machine that melts and softens the pellet mixture (melt-kneading).
  • the melt-kneading temperature is preferably 250 to 350 ° C., more preferably 260 to 340 ° C., and even more preferably 270 to 320 ° C.
  • the temperature of the measuring unit or the plunger unit is preferably 280 to 400 ° C., more preferably 290 to 380 ° C., and even more preferably 300 to 370 ° C.
  • the temperature of the mold is preferably set in the range of room temperature (for example, 23 ° C.) to 180 ° C. from the viewpoint of the cooling rate and productivity of the thermoplastic resin.
  • room temperature for example, 23 ° C.
  • the screw rotation speed, back pressure, injection speed, holding pressure, holding time, etc. may be appropriately adjusted.
  • the method for producing an injection-molded article of the present embodiment described above does not include the first pellet in which the first thermoplastic resin is impregnated with the fibrous filler, and the first thermoplastic resin that does not contain the fibrous filler. It has a step of mixing with a second pellet having a lower flow start temperature than the above to obtain a pellet mixture, and a step of injection molding the pellet mixture.
  • the fibrous filler is not over-expanded during the production of the injection molded product, and the final injection is produced.
  • the method for producing an injection-molded product of the present invention has the following aspects.
  • a method for producing an injection-molded article according to any one of “1” to “19".
  • a method for producing an injection-molded product which comprises a step of mixing with a second pellet containing the pellet to obtain a pellet mixture, and a step of injection-molding the pellet mixture.
  • the injection-molded product of the present embodiment described above is generally applicable to all applications to which the thermoplastic resin can be applied, and is particularly suitable for applications in the automobile field.
  • Applications in the automobile field include, for example, injection molded products for automobile interior materials, injection molded products for ceiling materials, injection molded products for wheel house covers, injection molded products for trunk room lining, injection molded products for instrument panel skin materials, and handles.
  • Injection molded product for cover injection molded product for armrest, injection molded product for headrest, injection molded product for seat belt cover, injection molded product for shift lever boot, injection molded product for console box, injection molded product for horn pad, for knob Injection molding, injection molding for airbag cover, injection molding for various trims, injection molding for various pillars, injection molding for door lock bezel, injection molding for grab box, injection molding for defroster nozzle, for scuff plate
  • Examples thereof include an injection molded product, an injection molded product for a steering wheel, and an injection molded product for a steering column cover.
  • injection molded products for automobile exterior materials injection molded products for bumpers, injection molded products for spoilers, injection molded products for mudguards, injection molded products for side moldings, injection molding for door mirror housings, etc.
  • examples include a body and an injection molded body for an underbody shield.
  • injection molded products for automobile parts include injection molded products for automobile head lamps, injection molded products for glass run channels, injection molded products for weather strips, injection molded products for drain hoses, and injection molded products for window washer tubes.
  • Injection moldings for tubes injection moldings for tubes, injection moldings for rack and pinion boots, injection moldings for gaskets, injection moldings for bumper beams, injection moldings for crash boxes, injection moldings for various members, suspension systems Examples thereof include injection moldings for front end modules, injection moldings for radiator support, injection moldings for back door inners, and the like.
  • the injection-molded product of this embodiment includes a sensor, an LED lamp, a connector, a socket, a resistor, a relay case, a switch, a coil bobbin, a capacitor, a variable capacitor case, an optical pickup, an oscillator, various terminal boards, and a modification. Vessels, plugs, printed circuit boards, tuners, speakers, microphones, headphones, small motors, magnetic head bases, power modules, semiconductors, liquid crystal displays, FDD carriages, FDD chassis, motor brush holders, parabolic antennas, computer-related parts, microwave parts It can also be applied to applications such as audio / audio equipment parts, lighting parts, air conditioner parts, office computer related parts, telephone / FAX related parts, and copying machine related parts.
  • thermoplastic resin The flow start temperature of the thermoplastic resin
  • a flow tester (“CFT-500 type” manufactured by Shimadzu Corporation)
  • about 2 g of thermoplastic resin was filled into a cylinder equipped with a die having a nozzle having an inner diameter of 1 mm and a length of 10 mm.
  • the thermoplastic resin is melted and extruded from a nozzle while raising the temperature at a rate of 4 ° C./min under a load of 9.8 MPa (100 kg / cm 2 ), and shows a viscosity of 4800 Pa ⁇ s (48,000 poisons).
  • the temperature (flow start temperature) was measured and used as the flow start temperature of the thermoplastic resin. The measurement results are shown in Table 2.
  • Pre-pellets (1) and pre-pellets (2) processed from a thermoplastic resin were prepared.
  • Pre-pellets (1) (LCP1 pellets) were produced as follows. A reactor equipped with a stirrer, torque meter, nitrogen gas introduction tube, thermometer and reflux condenser, 6-hydroxy-2-naphthoic acid (1034.99 g, 5.5 mol) and 2,6-naphthalenedicarboxylic acid.
  • the liquid crystal polyester obtained here has 55 mol% of the repeating unit (1) in which Ar 1 is a 2,6-naphthylene group and Ar 2 is a 2,6-naphthylene group, based on the total amount of all the repeating units.
  • a repeating unit (2) is 17.5 mol%, Ar 2 is a 1,4-phenylene group, a repeating unit (2) is 5 mol%, and Ar 3 is a 1,4-phenylene group. ) was 22.5 mol%, and the flow start temperature thereof was 300 ° C.
  • the obtained powdered liquid crystal polyester was granulated with a twin-screw extruder (PMT47, manufactured by IKG) at a cylinder temperature of 300 ° C. to produce prepellets (1) (LCP1 pellets).
  • the flow start temperature of the produced LCP1 pellet was 294 ° C.
  • Pre-pellets (2) (LCP2 pellets) were produced as follows. A reactor equipped with a stirrer, torque meter, nitrogen gas introduction tube, thermometer and reflux condenser, 6-hydroxy-2-naphthoic acid (1034.99 g, 5.5 mol) and 2,6-naphthalenedicarboxylic acid.
  • the liquid crystal polyester obtained here has 55 mol% of the repeating unit (1) in which Ar 1 is a 2,6-naphthylene group and Ar 2 is a 2,6-naphthylene group, based on the total amount of all the repeating units.
  • a repeating unit (2) is 17.5 mol%, Ar 2 is a 1,4-phenylene group, a repeating unit (2) is 5 mol%, and Ar 3 is a 1,4-phenylene group. ) was 22.5 mol%, and the flow start temperature thereof was 322 ° C.
  • the obtained powdered liquid crystal polyester was granulated with a twin-screw extruder (PMT47, manufactured by IKG) at a cylinder temperature of 320 ° C. to produce prepellets (2) (LCP2 pellets).
  • the flow start temperature of the produced LCP2 pellets was 303 ° C.
  • the first pellets (1) to (4) were manufactured as follows using the same manufacturing apparatus as that shown in FIG. A GTS-40 type extruder (manufactured by Plastic Engineering Laboratory Co., Ltd.) was used as the extruder 120. EBD-1500A (manufactured by Imex Co., Ltd.) was used as the belt type pick-up machine. The following glass fibers were used as the fibrous filler.
  • Fibrous filler Glass fiber roving manufactured by Nitto Boseki Co., Ltd. (HME-glass, number average fiber diameter 17 ⁇ m, fineness 1100 g / 1000 m)
  • pre-pellets (2) As the pre-pellets, pre-pellets (2) (LCP2 pellets) were used. A resin structure 13 having a glass fiber bundle of 95.2 parts by mass with respect to 100 parts by mass of the pre-pellets (2) (LCP2 pellets) was obtained. Specifically, it was manufactured as follows.
  • Step to obtain resin structure By operating the belt-type take-up machine (take-up unit 127), the glass fiber bundle 11 is continuously fed from the glass fiber roving 10 at a take-up speed of 10 m / min, and the glass fiber bundle 11 is first fed by the preheating unit 121. Was heated to 150 ° C. and dried. Next, while supplying the dried glass fiber bundle 11 to the die (impregnated portion 123) attached to the tip of the extruder 120, the molten prepellet (2) was charged from the extruder 120 through the supply port 123a. .. The prepellet (2) is melted at 380 ° C.
  • Step to obtain pellets Next, the cooled resin structure 13 is taken up in a strand shape by the belt-type take-up machine (take-up portion 127), fed out to a pelletizer (cutting portion 129), and cut to a predetermined length in the longitudinal direction thereof. A cylindrical (12 mm long) pellet 15 was obtained.
  • the pellet 15 was cut in the longitudinal direction, and the cross section obtained by the cutting was observed with a microscope. As a result of the observation, it was confirmed that the arrangement direction of the glass fibers was substantially the same as the longitudinal direction of the pellets and was substantially parallel to the longitudinal direction of the pellets. Regarding the length of the glass fiber in the pellet, the length-weighted average fiber length was measured by the following procedure.
  • Procedure (1) 2 g of pellets were heated in a muffle furnace at 600 ° C. for 4 hours to remove the resin component (first thermoplastic resin).
  • Procedure (2) A dispersion in which the resin component was removed from the pellet was dispersed in 1000 mL of an aqueous solution containing 0.05% by volume of a surfactant (Micro90, INTERRNATIONAL PRODUCTS CORPORATION) to prepare a dispersion.
  • a surfactant Micro90, INTERRNATIONAL PRODUCTS CORPORATION
  • Procedure (3) 100 mL was taken out from the dispersion and diluted 10-fold with pure water. Take out 50 mL from the diluted dispersion, disperse it in a petri dish, observe the glass fibers dispersed in the petri dish with a microscope (VH-Z25, manufactured by KEYENCE, 10x magnification), and make an image per sample. Ten shots were taken so that the shooting areas did not overlap.
  • Procedure (4) The lengths of all the fibers present in one photographed image were measured with a measuring tool of a microscope. The bent fibers were measured by multi-point measurement, and the fibers in contact with the edge of the image were not measured. The fiber length was measured by sequentially performing the same operation on the 10 images taken until the total number of measured fibers exceeded 500.
  • li Fiber length of glass fiber
  • ni Number of fiber length li glass fiber
  • the length-weighted average fiber length of the glass fiber was the same as the pellet length (12 mm).
  • pre-pellets (2) As the pre-pellets, pre-pellets (2) (LCP2 pellets) were used. A resin structure 13 having a glass fiber bundle of 97.1 parts by mass with respect to 100 parts by mass of the pre-pellets (2) (LCP2 pellets) was obtained. Except for these, a cylindrical pellet 15 (length 12 mm) was obtained in the same manner as in the production of the first pellet (1) described above.
  • PA66 long fiber GF pellets PLASTRON PA66-GF50 manufactured by Daicel Polymer Co., Ltd. (filling amount of glass fiber is 50% by mass with respect to total pellet amount, pellet length 9 mm), flow start temperature 264 ° C, polyamide resin impregnated into glass fiber Pellets.
  • Second pellets (1) and (2) containing a thermoplastic resin without containing a fibrous filler were prepared.
  • the pre-pellet (1) LCP1 pellet
  • the pre-pellet (1) LCP1 pellet
  • PA6 pellets UBE nylon 1013B manufactured by Ube Industries, Ltd., flow start temperature 226 ° C.
  • compositions of the first pellets (1) to (5) and the second pellets (1) to (2) are shown in Table 1.
  • the injection-molded products of each example were produced by a step of mixing the first pellet, the second pellet, and the measurement stabilizer to obtain a pellet mixture, and a step of injection-molding the pellet mixture.
  • Example 1 Step to obtain pellet mixture: After mixing the first pellet (1) and the second pellet (1) prepared above at the ratios shown in Table 2, the first pellet (1) and the second pellet (1) are combined. To 100 parts by mass of the mixture, 0.04 part by mass of CS-7 (calcium behenate, manufactured by Nitto Kasei Kogyo Co., Ltd.) was added as a measurement stabilizer and mixed uniformly to obtain a pellet mixture.
  • CS-7 calcium behenate, manufactured by Nitto Kasei Kogyo Co., Ltd.
  • Injection molding process of pellet mixture The pellet mixture was put into a hopper of an injection molding machine TR450EH3 (manufactured by Sodick Co., Ltd.). JIS K7139 by melt-kneading in the injection molding machine having a plasticized portion temperature (that is, melt-kneading temperature) of 300 ° C. and injecting it into a mold having a mold temperature of 100 ° C. at an injection speed of 20 mm / sec. A multipurpose test piece (type A1) (thickness 4 mm) conforming to the above was molded. The gate was a film gate having a thickness of 4 mm from the upper side of the grip portion on one side of the multipurpose test piece. Other injection conditions: Plunger temperature 360 ° C, screw rotation speed (plasticized part) 100 rpm, back pressure 0 MPa, holding pressure 100 MPa, holding time 5 seconds
  • JIS K7139 was used in the same manner as in the method for producing an injection-molded article of Example 1, except that the first pellet (2) and the second pellet (1) were used in combination and the mixing ratio of the pellet mixture was changed.
  • a compliant multipurpose test piece (type A1) (thickness 4 mm) was molded.
  • Example 2 Step to obtain pellet mixture: After mixing the first pellet (3) and the second pellet (2) prepared above at the ratios shown in Table 2, the first pellet (3) and the second pellet (2) are combined. To 100 parts by mass of the mixture, 0.04 part by mass of CS-7 (calcium behenate, manufactured by Nitto Kasei Kogyo Co., Ltd.) was added as a measurement stabilizer and mixed uniformly to obtain a pellet mixture.
  • CS-7 calcium behenate, manufactured by Nitto Kasei Kogyo Co., Ltd.
  • Injection molding process of pellet mixture The pellet mixture was put into a hopper of an injection molding machine TR450EH3 (manufactured by Sodick Co., Ltd.). JIS K7139 by melt-kneading in the injection molding machine having a plasticized portion temperature (that is, melt-kneading temperature) of 270 ° C. and injecting it into a mold having a mold temperature of 100 ° C. at an injection speed of 20 mm / sec. A multipurpose test piece (type A1) (thickness 4 mm) conforming to the above was molded. The gate was a film gate having a thickness of 4 mm from the upper side of the grip portion on one side of the multipurpose test piece. Other injection conditions: Plunger temperature 300 ° C, screw rotation speed (plasticized part) 100 rpm, back pressure 0 MPa, holding pressure 100 MPa, holding time 5 seconds
  • Example 4 A multipurpose test piece (type A1) (thickness 4 mm) conforming to JIS K7139 in the same manner as in the method for producing an injection-molded article of Example 2 except that the temperature of the plasticized portion (that is, the melt-kneading temperature) was changed. ) was molded.
  • JIS K7139 was used in the same manner as in the method for producing an injection-molded article of Example 2, except that the first pellet (5) and the second pellet (2) were used in combination and the mixing ratio of the pellet mixture was changed.
  • a compliant multipurpose test piece (type A1) (thickness 4 mm) was molded.
  • Example 3 Step to obtain pellet mixture: After mixing the first pellet (4) and the second pellet (1) prepared above at the ratios shown in Table 2, the first pellet (4) and the second pellet (1) are combined. To 100 parts by mass of the mixture, 0.04 part by mass of CS-7 (calcium behenate, manufactured by Nitto Kasei Kogyo Co., Ltd.) was added as a measurement stabilizer and mixed uniformly to obtain a pellet mixture.
  • CS-7 calcium behenate, manufactured by Nitto Kasei Kogyo Co., Ltd.
  • Injection molding process of pellet mixture The pellet mixture was put into a hopper of an injection molding machine TR450EH3 (manufactured by Sodick Co., Ltd.). JIS K7139 by melt-kneading in the injection molding machine having a plasticized portion temperature (that is, melt-kneading temperature) of 300 ° C. and injecting it into a mold having a mold temperature of 100 ° C. at an injection speed of 20 mm / sec. A multipurpose test piece (type A1) (thickness 4 mm) conforming to the above was molded. The gate was a film gate having a thickness of 4 mm from the upper side of the grip portion on one side of the multipurpose test piece. Other injection conditions: Plunger temperature 360 ° C, screw rotation speed (plasticized part) 100 rpm, back pressure 0 MPa, holding pressure 100 MPa, holding time 5 seconds
  • S Standard deviation
  • S 2 Dispersion
  • n Total number of 5 mm square test pieces
  • x i Filling amount of each fibrous filler in the 5 mm square test piece (that is, the ratio of the mass of the fibrous filler to the mass of the 5 mm square test piece [mass%])
  • X Average value of 8 points of filling amount of fibrous filler
  • Procedure (1) The mass (m 0 ) of the test piece and the mass (M 1 ) of the test piece cut into a 5 mm square are measured with a precision balance. It was measured up to 1 mg unit.
  • Procedure (2) The test piece was placed in the crucible and heated in a muffle furnace at 600 ° C. for 4 hours to remove the resin component.
  • Procedure (1) A test piece having a width of 10 mm, a length of 30 mm, and a thickness of 4 mm is cut out from the center of a multipurpose test piece (type A1) (thickness 4 mm) and heated in a muffle furnace at 600 ° C. for 4 hours to resin. Minutes were removed.
  • Procedure (2) A dispersion in which the resin component was removed from the test piece was dispersed in 1000 mL of an aqueous solution containing 0.05% by volume of a surfactant (Micro90 INTERRNATIONAL PRODUCTS CORPORATION) to prepare a dispersion.
  • a surfactant Micro90 INTERRNATIONAL PRODUCTS CORPORATION
  • Procedure (3) 100 mL was taken out from the dispersion and diluted 10-fold with pure water. 50 mL is taken out from the diluted dispersion and dispersed in a petri dish, and then the glass fibers dispersed in the petri dish are observed with a microscope (VH-ZST (manufactured by KEYENCE) at a magnification of 20 times) to obtain an image. Ten images were taken for each sample so that the photographing areas did not overlap.
  • Procedure (4) The lengths of all the fibers present in one captured image were measured with a measuring tool of a microscope. The bent fibers were measured by multi-point measurement. The fiber length was measured by sequentially performing the same operation on the 10 images taken until the total number of measured fibers exceeded 500.
  • Charpy impact test From the injection-molded article (multipurpose test piece (type A1) (thickness 4 mm)) of each example, a notchless test piece having a width of 10 mm, a length of 80 mm, and a thickness of 4 mm was cut out. This notchless test piece was notched with a 45 ° V-shaped groove (notch tip radius: 0.25 mm ⁇ 0.05 mm) having a depth of 2 mm in accordance with ISO 2818 and JIS K7144. A notching tool (Toyo Seiki Co., Ltd. model A-4) was used for notching.
  • a Charpy impact test was carried out using a notched test piece (a test piece with a notch) in accordance with ISO179-1 and JIS K7111-1, and using a hammer 2.0J and 4.0J.
  • the Charpy impact strength of the notched test piece the average value of 5 measurements was adopted.
  • Example 2 to which the present invention was applied had a larger Charpy impact strength value than the injection-molded products of Comparative Examples 4 to 5, and the strength against a collision load was further increased. it can.
  • the injection-molded product of Example 3 to which the present invention is applied has a larger Charpy impact strength value than the injection-molded product of Comparative Example 6, and the strength against a collision load is further increased.

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Abstract

La présente invention concerne un article moulé par injection qui contient 65 à 95 parties en masse d'une résine thermoplastique et 5 à 35 parties en masse d'une charge fibreuse. Dans l'invention, la résine thermoplastique contient au moins un type de substance choisie dans le groupe constitué par les polypropylènes et les polyesters à cristaux liquides en une quantité qui est supérieure ou égale à 10 % en masse par rapport à la quantité totale de la résine thermoplastique ; et l'écart-type de la quantité de charge fibreuse dans l'article moulé par injection est supérieur à 1,0 % en masse.
PCT/JP2020/029745 2019-08-09 2020-08-04 Article moulé par injection et son procédé de fabrication WO2021029263A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0376614A (ja) * 1989-08-21 1991-04-02 Sumitomo Chem Co Ltd 繊維強化熱可塑性樹脂成形品の製造方法
JPH03284917A (ja) * 1990-03-30 1991-12-16 Isuzu Motors Ltd プラスチックの局部強化方法
JPH06226866A (ja) * 1993-01-29 1994-08-16 Mazda Motor Corp 液晶樹脂複合体の成形方法およびその成形用素材

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58134721A (ja) * 1982-02-04 1983-08-11 Aron Kasei Co Ltd 導電性フイラ−を混入してなる熱可塑性樹脂成形品
JPH07108557A (ja) * 1993-10-13 1995-04-25 Mitsubishi Plastics Ind Ltd 長繊維材を配した成形品の射出成形方法
FR3029448B1 (fr) * 2014-12-05 2018-04-20 Plastic Omnium Cie Procede de fabrication d'une piece de vehicule automobile en matiere thermoplastique renforcee

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0376614A (ja) * 1989-08-21 1991-04-02 Sumitomo Chem Co Ltd 繊維強化熱可塑性樹脂成形品の製造方法
JPH03284917A (ja) * 1990-03-30 1991-12-16 Isuzu Motors Ltd プラスチックの局部強化方法
JPH06226866A (ja) * 1993-01-29 1994-08-16 Mazda Motor Corp 液晶樹脂複合体の成形方法およびその成形用素材

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