JP2005002202A - Fiber-reinforced resin composition and its molding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a fiber-reinforced resin composition having excellent strength and its molding. <P>SOLUTION: The fiber-reinforced resin composition comprises a first thermoplastic resin, a second thermoplastic resin containing a reactive functional group, a reinforcing fiber containing a reactive functional group on the surface and a polyfunctional compound containing two or more functional groups to be reacted with the reactive functional group of the second thermoplastic resin and/or the reactive functional group of the reinforcing fiber. Preferably the first thermoplastic resin has 1-300 g/10 minutes melt flow rate (MFR) and the second thermoplastic resin is an acid-modified polypropylene-based resin. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【００４６】
［射出成形品の作製及び評価］
上記実施例及び比較例で得られたガラス繊維強化熱可塑性樹脂ペレットを用い、ＪＩＳ
Ｋ ７１５２−１−１９９９に準拠して、射出成形サンプルを作製した。
得られた評価サンプルについて、下記の物性項目を測定し、評価を行った。評価結果を表２に示す。
▲１▼密度：ＪＩＳ Ｋ ７１１２−１９９９に準拠し測定。
▲２▼引張り破壊応力：ＪＩＳ Ｋ ７１６２−１９９４に準拠し測定。
▲３▼曲げ強さ：ＪＩＳ Ｋ ７１７１−１９９４に準拠し測定。
▲４▼曲げ弾性率：ＪＩＳ Ｋ ７１７１−１９９４に準拠し測定。
▲５▼シャルピー衝撃強さ：ＪＩＳ Ｋ ７１１１−１９９６に準拠し、２３℃で測定。
【００４７】
【表２】

【００４８】
【発明の効果】
本発明によれば、優れた強度を有する繊維強化樹脂組成物及びその成形品が提供できる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fiber reinforced resin composition and a molded product thereof.
[0002]
[Prior art]
Fiber reinforced thermoplastic resin compositions are important industrial materials because of their excellent rigidity and heat resistance. In particular, a composition using polypropylene as a thermoplastic resin is widely used for automobile parts, industrial parts and the like because it gives a molded article having excellent mechanical strength and heat resistance.
[0003]
The fiber reinforced thermoplastic resin composition is obtained by blending various fibrous reinforcing agents and fillers into a thermoplastic resin in order to enhance physical properties such as mechanical properties and thermal properties. However, when the thermoplastic resin used in the production of the fiber reinforced resin composition is a nonpolar resin, the affinity with various reinforcing agents and fillers is poor, that is, at the interface between the reinforcing agent or filler and the thermoplastic resin. Therefore, the tensile fracture stress and bending strength required for the fiber reinforced thermoplastic resin composition were not sufficiently improved.
[0004]
Therefore, in order to improve the adhesion, improvement of reinforcing agents, fillers, and thermoplastic resins has been performed.
For example, as a method for improving a reinforcing agent or a filler, a method is known in which the surface of a fiber is treated with a silane coupling agent or the like to improve the adhesion to a thermoplastic resin.
On the other hand, as an improvement of thermoplastic resins, there is known a method of increasing the affinity with reinforcing agents and fillers by grafting unsaturated carboxylic acid or epoxy group-containing vinyl compound onto thermoplastic resins to introduce polar groups. It has been.
However, sufficient improvement of physical properties is not recognized in any method. Therefore, recently, a method combining the above two methods has been studied, but the strength is not sufficient, and the result is insufficient for applications requiring high strength. .
[0005]
On the other hand, as another method, a reinforced polyolefin resin composition in which an organic or inorganic fibrous reinforcing agent and a polycyclic epoxy compound are blended with a mixture of polyolefin and modified polyolefin is disclosed (see Patent Document 1).
However, this composition does not exhibit sufficient strength.
As described above, the fiber reinforced resin composition is currently required to further improve various strengths.
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 58-204020 [0007]
[Problems to be solved by the invention]
This invention is made | formed in view of the said situation, and aims at providing the fiber reinforced resin composition which has the outstanding intensity | strength, and its molded article.
[0008]
[Means for Solving the Problems]
According to the first aspect of the present invention, the first thermoplastic resin, the second thermoplastic resin having a reactive functional group, the reinforcing fiber having a reactive functional group on the surface, and the second thermoplastic resin are provided. There is provided a fiber reinforced resin composition comprising a reactive functional group having and / or a polyfunctional compound having two or more functional groups that react with a reactive functional group of a reinforcing fiber.
[0009]
According to the second aspect of the present invention, there is provided a fiber reinforced resin composition comprising the following components (A) to (C).
(A) Mixture of the first thermoplastic resin and the second thermoplastic resin having a reactive functional group: 10 to 95 wt%
(B) Reinforcing fiber having a reactive functional group on the surface: 90 to 5 wt%
(C) a polyfunctional compound having two or more functional groups that react with the reactive functional group of the second thermoplastic resin and / or the reactive functional group of the reinforcing fiber: component (A) and component (B) 0.05 to 3 parts by weight with respect to a total of 100 parts by weight
According to the 3rd aspect of this invention, the molded article formed by shape | molding said fiber reinforced resin composition is provided.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the fiber reinforced resin composition of the present invention will be described.
The composition of the present invention comprises a first thermoplastic resin, a second thermoplastic resin having a reactive functional group, a reinforced fiber having a reactive functional group on the surface, and a reactive function possessed by the second thermoplastic resin. The polyfunctional compound which has 2 or more of functional groups which react with the reactive functional group which a group and / or a reinforced fiber have is included.
[0012]
The first thermoplastic resin used in the present invention is not particularly limited, for example, a propylene homopolymer, a propylene / ethylene block copolymer, a propylene / ethylene random copolymer, a polyolefin resin such as high density polyethylene, Polystyrene, rubber-modified impact-resistant polystyrene, polystyrene containing a syndiotactic structure, styrene resins such as ABS resin and AS resin, polyester resins, polyacetal resins, polyaromatic ethers, acrylate resins, and the like can be used.
Of these thermoplastic resins, polyolefin resins are preferred, and in particular, polypropylene (propylene homopolymer), block copolymers of propylene and other olefins (eg, ethylene, butene-1), random copolymers, Alternatively, it is desirable to employ a polypropylene resin such as a copolymer thereof.
In addition, although each said thermoplastic resin can also be used independently, you may use it in mixture of 2 or more types.
[0013]
When the polypropylene resin is used as the first thermoplastic resin, its melt flow rate (MFR) is preferably 1 to 300 g / 10 minutes, more preferably 20 to 200 g / 10 minutes, and particularly preferably 30 to 100 g. / 10 minutes.
If the MFR is less than 1 g / 10 min, the dispersibility of the reinforcing fibers in the molded body may be reduced, and an appearance defect of the molded body may be observed. On the other hand, if the MFR is larger than 300 g / 10 min, the impact strength is inferior, which is not preferable.
In order to adjust the MFR to the above range, the amount of added hydrogen may be adjusted during the polymerization, or decomposed with a peroxide after the polymerization.
[0014]
The polypropylene resin can be produced by slurry polymerization, gas phase polymerization, or liquid layer bulk polymerization of propylene and other monomer components using a known polymerization catalyst. In addition, as a polymerization method for producing the propylene-based resin, either batch polymerization or continuous polymerization can be employed.
[0015]
The second thermoplastic resin having a reactive functional group used in the present invention is an epoxy group, carboxyl group, amino group, sulfone group, oxazoline group, carboxylic anhydride group ( A reactive functional group such as a maleic anhydride group or a phthalic anhydride group). Of these, a carboxyl group and a carboxylic anhydride group are preferable.
The types of the first and second thermoplastic resins contained in the composition of the present invention may be the same or different.
In the present invention, as the first and second thermoplastic resins, a blend of a thermoplastic resin having no reactive functional group and a thermoplastic resin having a reactive functional group, or a thermoplastic resin having no reactive functional group. And a modifier containing a reactive functional group may be reacted by graft polymerization or the like in an extruder to introduce a reactive functional group into a part of the thermoplastic resin.
In the former case, it is preferable that the thermoplastic resin having a reactive functional group is contained in an amount of preferably 0.1 to 30 wt%, more preferably 0.5 to 20 wt%, and particularly preferably 0.5 to 10 wt%.
In the latter case, the reaction is preferably 0.1 to 20 wt%, more preferably 0.5 to 15 wt%, and particularly preferably 0.5 to 10 wt%.
[0016]
A preferred second thermoplastic resin is a resin obtained by modifying a thermoplastic resin with an unsaturated carboxylic acid or a derivative thereof. Particularly preferred are those obtained by modifying polypropylene resins widely used in industry with unsaturated carboxylic acids or their derivatives.
[0017]
The MFR of the acid-modified polypropylene resin is preferably 5 to 800 g / 10 minutes. If the MFR is less than 5 g / 10 minutes, the reinforcing fibers are liable to cause poor dispersion. If the MFR is greater than 800 g / 10 minutes, the impact strength and the like may be reduced.
[0018]
Examples of the unsaturated carboxylic acid used for the modification of the thermoplastic resin include acrylic acid, methacrylic acid, maleic acid, nadic acid, fumaric acid, itaconic acid, crotonic acid, citraconic acid, sorbic acid, mesaconic acid, angelic acid and the like. . Derivatives include acid anhydrides, esters, amides, imides, metal salts, and the like. For example, maleic anhydride, itaconic anhydride, citraconic anhydride, nadic anhydride, methyl acrylate, methyl methacrylate, acrylic Examples include ethyl acid, butyl acrylate, maleic acid monoethyl ester, acrylamide, maleic acid monoamide, maleimide, N-butylmaleimide, sodium acrylate, and sodium methacrylate.
Among these, unsaturated dicarboxylic acids and derivatives thereof are preferable, and maleic anhydride or phthalic anhydride is particularly preferable.
[0019]
The acid addition rate is preferably in the range of 0.4 to 10 wt%, particularly 0.9 to 8 wt%. When the acid addition rate is less than 0.4 wt%, the adhesiveness and mechanical strength may be lowered between the thermoplastic resin and the reinforcing fiber. On the other hand, if it is larger than 10 wt%, impact strength and the like may be reduced.
[0020]
The acid modification may be performed in advance prior to the production of the resin composition, or may be performed in a melt-kneading process during the production of the resin composition.
The acid addition rate and MFR can be adjusted by the peroxide amount, acid amount, temperature, and MFR of the polypropylene used when acid-modifying from polypropylene.
In the case where the acid modification is performed in advance prior to the production of the resin composition, methods such as JP-A-51-149344, JP-A-52-105993, and JP-A-53-86792 can be used.
Further, when the acid modification is performed in the melt-kneading process, the polypropylene resin and the unsaturated carboxylic acid or derivative thereof are kneaded in an extruder using an organic peroxide. Thereby, a polypropylene and unsaturated carboxylic acid carry out graft copolymerization.
[0021]
Examples of the organic peroxide include benzoyl peroxide, lauroyl peroxide, azobisisobutyronitrile, dicumyl peroxide, t-butyl hydroperoxide, α, α′-bis (t-butylperoxydiisopropyl). ) Benzene, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, 2,5-dimethyl-2,5-di (t-butylperoxy) hexyne-3, di-t-butyl Peroxide, cumene hydroperoxide, t-butyl hydroperoxide and the like can be mentioned.
[0022]
The blending amount of the first thermoplastic resin and the mixture of the second thermoplastic resin having a reactive functional group is preferably 10 to 95 wt%, more preferably 50 to 90 wt%, and particularly preferably 60 to 85 wt%. It is.
[0023]
Examples of reinforcing fibers used in the present invention include inorganic fibers such as glass fibers and carbon fibers, silicon fibers, silicon / titanium / carbon fibers, boron fibers, metal fibers such as iron and titanium, aramid fibers, polyester fibers, polyamide fibers, and vinylon. Organic synthetic fibers such as silk, natural fibers such as silk, cotton and hemp can be used widely. You may use these individually or in combination of 2 or more types.
[0024]
Among these, glass fiber is preferable from the viewpoint of reinforcing effect and availability.
As the glass fiber, glass such as E glass (Electrical glass), C glass (Chemical glass), A glass (Alkali glass), S glass (High strength glass), and alkali-resistant glass is melt-spun into a filament-like fiber. Can be mentioned.
[0025]
A continuous glass fiber bundle is used as a raw material for the long glass fiber, which is commercially available as glass roving. Usually, the average fiber diameter is 4 to 30 μm, the number of filament bundles is 400 to 10,000, and the tex count is 300 to 20,000 g / km. In the present invention, those having an average fiber diameter of 9 to 23 μm and a number of bundles of 1,000 to 6,000 are preferably used.
[0026]
Moreover, a glass chopped strand can also be used as glass fiber. The length of the chopped strand is usually 3 to 50 mm, and the fiber diameter is about 3 to 25 μm, preferably 8 to 14 μm. When the diameter of the glass fiber is less than 3 μm, the glass fiber does not conform to the resin during pellet production, and it becomes difficult to impregnate the resin. On the other hand, if it exceeds 30 μm, cutting and chipping are likely to occur during melt-kneading. A carbon fiber subjected to a surface treatment such as an oxidation etching method or a coating method is also preferable.
[0027]
The fiber diameter of the reinforcing fiber is preferably 3 to 30 μm, more preferably 8 to 20 μm. If the fiber diameter is too small, the fibers are easily damaged, and the productivity of the reinforcing fiber bundle may be reduced. Moreover, when pellets are continuously produced, a large number of fibers must be bundled, which is not preferable because the labor for connecting the fiber bundles becomes complicated and the productivity decreases.
[0028]
The reinforcing fiber used in the present invention has a reactive functional group on its surface. A reactive functional group can be introduced on the surface of the reinforcing fiber by treating with a coupling agent.
As the coupling agent, there are many organic compounds, and chromium, silane, titanium, aluminum, and zirconium coupling agents can be used. Among these, a silane coupling agent is widely used industrially as a bonding accelerator between an organic material and an inorganic material, and is useful.
[0029]
Examples of the silane coupling agent include γ-aminopropyltriethoxysilane, N-β- (aminoethyl) -γ-aminopropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, β- (3,4). -Epoxycyclohexyl) ethyltrimethoxysilane, vinyltriethoxysilane, vinyl-tris (β-methoxyethoxy) silane, γ-methacryloxypropyltrimethoxysilane, β- (2,4-epoxycyclohexyl) ethoxymethoxysilane, γ- (2-aminoethyl) aminopropyltrimethoxysilane, N-β- (aminoethyl) -γ-aminopropyltrimethoxysilane, and other aminosilane compounds and epoxysilane compounds that give amino groups and epoxy groups as reactive functional groups A compound can be employed. In particular, it is preferable to employ an amino silane compound.
When the reinforcing fiber subjected to the surface treatment in this way is used, the interfacial adhesion with the thermoplastic resin can be imparted or improved, and a molded article having good strength and appearance can be obtained.
[0030]
The compounding amount of the reinforcing fiber is preferably 5 to 80 wt%, more preferably 5 to 60 wt%, and particularly preferably 10 to 50 wt%. If it is less than 5 wt%, it tends to be a composition having a low degree of strengthening. On the other hand, when it exceeds 80 wt%, it becomes difficult to pelletize the resin composition.
[0031]
In the present invention, a sizing agent may be used in order to make it easier to handle the reinforcing fibers in a bundle.
As the sizing agent, for example, urethane, olefin, acrylic, butadiene, and epoxy can be used. Among these, it is preferable to employ urethane and olefin.
Here, the urethane-based sizing agent is usually obtained by a polyaddition reaction between a diisocyanate compound and a polyhydric alcohol, and if it contains polyisocyanate in a proportion of 50 wt% or more, it is an oil-modified type, moisture Both one-component types such as a curable type and a block type, and two-component types such as a catalyst curable type and a polyol curable type can be adopted.
On the other hand, as the olefin-based sizing agent, a modified polyolefin-based resin modified with an unsaturated carboxylic acid or a derivative thereof can be employed.
[0032]
The polyfunctional compound used in the present invention is a compound having two or more functional groups that react with the reactive functional group of the thermoplastic resin and / or the reactive functional group of the reinforcing fiber.
This compound is selected from an epoxy group, a carboxyl group, a formyl group, an amino group, a sulfone group, an oxazoline group, a mercapto group, a halogen group, and a carboxylic anhydride group (for example, a maleic anhydride group and a phthalic anhydride group). It has 2 or more, preferably 3 or more, one or more functional groups selected from an epoxy group, a carboxyl group, a formyl group, and a carboxylic anhydride group.
[0033]
Preferable specific compounds include benzenehexacarboxylic acid dianhydride, 1,3,5-triformylbenzene, trimesic acid, triglycidyl isocyanurate and the like.
[0034]
The compounding amount of the polyfunctional compound is preferably 0.05 to 3 parts by weight, more preferably 0.1 to 2 parts by weight, particularly preferably 100 parts by weight in total of the component (A) and the component (B). 0.4 to 1.5 parts by weight. When the blending amount is less than 0.05 parts by weight, the effect of the present compound is not exhibited. On the other hand, when the amount is more than 3 parts by weight, the strength development effect becomes constant, and there is no point in adding more.
[0035]
In the fiber reinforced resin composition of the present invention, by using a polyfunctional compound having two or more functional groups that react with the reactive functional group of the thermoplastic resin and / or the reactive functional group of the reinforcing fiber, 3 It is considered that excellent strength is developed as a result of more complex formation and increase of the network structure due to chemical bonding between the two and strengthening the interface between the thermoplastic resin and the reinforcing fiber.
[0036]
The resin composition of the present invention is preferably used after being pelletized.
In the production of fiber reinforced resin pellets, any method of producing reinforced resin pellets of long fibers and short fibers can be used.
The pellet length of the fiber reinforced resin pellet is preferably 2 to 200 mm. If the fiber length is too short, the effect of improving rigidity, heat resistance and impact strength is low, and warping deformation may be increased. On the other hand, if the fiber length is too long, molding may be difficult. The pellet length is preferably in the range of 3 to 100 mm, more preferably in the range of 3 to 50 mm, and still more preferably in the range of 6 to 25 mm.
In addition, it is desirable that the reinforcing fibers are substantially parallel to each other in the fiber reinforced resin pellet.
[0037]
As a method for producing a long fiber strong resin pellet, a molten resin is supplied from an extruder into an impregnation die provided at the tip of an extruder, while a continuous glass fiber bundle is passed through the molten resin into the glass fiber bundle. After impregnating, a method of drawing through a nozzle and pelletizing to a length of 2 to 50 mm is taken. As a method for impregnation, a roving of reinforcing fibers is passed through a thermoplastic resin powder fluidized bed, and after the thermoplastic resin powder is adhered thereto, the thermoplastic resin is heated to a temperature higher than the melting point of the thermoplastic resin. A method of impregnating a resin (Japanese Patent Publication No. 52-3985), a method of impregnating a thermoplastic resin melted in a roving of a reinforcing fiber using a crosshead die (Japanese Patent Laid-Open No. 62-60625, Japanese Patent Laid-Open No. 63) No. 1332036, JP-A 63-264326, JP-A 1-208118), a method of impregnating a resin by mixing resin fibers and rovings of reinforcing fibers and then heating to a temperature higher than the melting point of the resin (Japanese Patent Laid-Open No. Sho 61-118235), a method in which a plurality of rods are arranged inside a die, and roving is wound around in a roving manner so that the fiber is spread and impregnated with molten resin (Japanese Patent Laid-Open No. 61-118235). 10-264152 JP) method or the like can also be used.
[0038]
As a method for producing the short fiberglass fiber, a method in which each component is well kneaded and dispersed with a roll mill, a Banbury mixer, a kneader or the like at a predetermined ratio is employed. Moreover, you may dry blend with a tumbler type blender, a Henschel mixer, a ribbon mixer, etc. Then, it knead | mixes with a single screw extruder, a twin screw extruder etc., and is set as a pellet-shaped molding material.
[0039]
In the composition part of the present invention, various additives, for example, dispersants, lubricants, plasticizers, flame retardants, antioxidants (phenolic antioxidants, phosphoric antioxidants, sulfur-based oxidations) are used depending on the application. Inhibitors), antistatic agents, light stabilizers, ultraviolet absorbers, crystallization accelerators (nucleating agents), foaming agents, crosslinking agents, modifying additives such as antibacterial agents, colorants such as pigments and dyes, Carbon black, titanium oxide, bengara, azo pigment, anthraquinone pigment, phthalocyanine, talc, calcium carbonate, mica, clay and other particulate fillers, short fiber fillers such as wollastonite, whisker such as potassium titanate, etc. Known additives can be added.
These additives may be added during pellet production and contained in the pellet, or may be added when a molded body is produced from the pellet.
[0040]
When molding the resin composition of the present invention, any known molding method such as injection molding, extrusion molding, hollow molding, compression molding, injection compression molding, gas injection injection molding, foam injection molding, etc. Applicable without limitation. In particular, an injection molding method, a compression molding method, and an injection compression molding method are preferable.
[0041]
The blending of the fiber reinforced resin pellets and the diluent (the same thermoplastic resin as the fiber reinforced pellets) may be a dry blend method. Rather, in order to maintain the fiber length in the composition and obtain higher rigidity, impact resistance, and durability improvement effects, do not pass through an extruder after dry blending, but directly into a molding machine such as an injection molding machine. It is preferable to provide. The mixing ratio of the diluent is determined by the reinforcing fiber content of the fiber reinforced resin group pellets and the reinforcing fiber content required for the final molded product, but the effect of improving rigidity, impact resistance, and durability. From a point, it is 20 to 85 wt%.
[0042]
Molded articles formed by molding the resin composition of the present invention include automotive parts (front end, fan shroud, cooling fan, engine under cover, engine cover, radiator box, side door, back door inner, back door outer, outer plate. , Roof rails, door handles, luggage boxes, wheel covers, handles), motorcycle and bicycle parts (luggage boxes, handles, wheels), housing-related parts (warm water washing valve seat parts, bathroom parts, chair legs, valves, meter boxes ) And other applications (power tool parts, mower handles, hose joints) and the like.
The resin composition of the present invention and the molded product thereof have superior strength (for example, tensile fracture stress, bending strength) compared to conventional products.
[0043]
【Example】
EXAMPLES Hereinafter, although this invention is demonstrated in more detail based on an Example, this invention is not limited to these Examples.
In addition, the raw material used in the present Example is as follows.
(1) Thermoplastic resin (first thermoplastic resin)
Uses polypropylene.
Made by Idemitsu Petrochemical Co., Ltd., IDEMITSU PP, (Product name) J-3000GP
MFR: 30 g / 10 min. (Measured at 230 ° C and 2.16 kg load)
(2) Thermoplastic resin having a reactive functional group (second thermoplastic resin)
Use maleic acid-modified polypropylene.
Toyo Kasei Co., Ltd., Toyo Tack, (Product Name) H-1000P
MFR: 800 g / 10 min. (Measured at 230 ° C and 2.16 kg load)
Denaturation rate (acid addition amount): 4.1 wt%
(3) Reinforced fiber subjected to surface treatment (1) Glass fiber (a) Made by Nippon Electric Glass Co., Ltd., (Product name) T-480H
Average fiber diameter 10μm
CS Chopped strand strand length 3mm
Uses aminosilane coupling agent and olefinic sizing agent.
(B) Made by Asahi Fiber Glass Co., Ltd. (Product Name) CS 03 JA FT17
Average fiber diameter 10μm
CS Chopped strand strand length 3mm
Uses aminosilane coupling agent and urethane sizing agent.
(4) Use of polyfunctional compound triglycidyl isocyanurate.
(Product name) TEPIC-S, manufactured by Nissan Chemical Industries, Ltd.
[0044]
Examples 1-4, Comparative Examples 1-3
[Production of glass fiber reinforced thermoplastic resin pellets]
Using a biaxial kneader (TEM-20, manufactured by Toshiba Machine), the thermoplastic resin shown in Table 1 on the top feed part, the thermoplastic resin having a reactive functional group, and the polyfunctional compound are shown in Table 1. I put it in.
Further, glass fibers (chopped strands) shown in Table 1 were introduced from the side feed portion, kneaded at 210 ° C., the strands were cooled with water, and then cut with a pelletizer to obtain glass fiber reinforced thermoplastic resin pellets.
[0045]
[Table 1]

[0046]
[Production and evaluation of injection molded products]
Using the glass fiber reinforced thermoplastic resin pellets obtained in the above examples and comparative examples, JIS
An injection-molded sample was prepared according to K7152-1-1999.
About the obtained evaluation sample, the following physical property item was measured and evaluated. The evaluation results are shown in Table 2.
(1) Density: Measured according to JIS K 7112-1999.
(2) Tensile fracture stress: measured in accordance with JIS K 7162-1994.
(3) Bending strength: Measured in accordance with JIS K 7171-1994.
(4) Flexural modulus: measured in accordance with JIS K 7171-1994.
(5) Charpy impact strength: Measured at 23 ° C. according to JIS K 7111-1996.
[0047]
[Table 2]

[0048]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the fiber reinforced resin composition which has the outstanding intensity | strength, and its molded article can be provided.

Claims (7)

The first thermoplastic resin,
A second thermoplastic resin having a reactive functional group,
Reinforcing fiber having a reactive functional group on the surface, and a polyfunctional compound having two or more functional groups that react with the reactive functional group of the second thermoplastic resin and / or the reactive functional group of the reinforcing fiber A fiber reinforced resin composition comprising: A fiber reinforced resin composition comprising the following components (A) to (C).
(A) Mixture of the first thermoplastic resin and the second thermoplastic resin having a reactive functional group: 10 to 95 wt%
(B) Reinforcing fiber having a reactive functional group on the surface: 90 to 5 wt%
(C) a polyfunctional compound having two or more functional groups that react with the reactive functional group of the second thermoplastic resin and / or the reactive functional group of the reinforcing fiber: component (A) and (B ) 0.05 to 3 parts by weight with respect to 100 parts by weight of the total components The fiber-reinforced resin composition according to claim 1 or 2, wherein the first thermoplastic resin is a polyolefin resin. The first thermoplastic resin is a polypropylene resin having a melt flow rate (MRF) of 1 to 300 g / 10 min, and the second thermoplastic resin is an acid-modified polypropylene resin. The fiber-reinforced resin composition according to one item. The fiber reinforced resin composition according to any one of claims 1 to 4, wherein the reinforcing fiber is a glass fiber treated with an amino silane compound. 6. The polyfunctional compound according to claim 1, wherein the polyfunctional compound is a polyfunctional compound having three or more functional groups selected from an epoxy group, a carboxyl group, a formyl group, and a carboxylic anhydride group in the molecule. The fiber-reinforced resin composition according to claim 1. The molded article formed by shape | molding the fiber reinforced resin composition as described in any one of Claims 1-6.