JP2005139422A - Regenerated resin obtained from crushed thermoplastic waste plastic material mingled with cured resin material and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a regenerated resin capable of obtaining a molded article excellent in appearance by using a crushed waste plastic materials mingled with a small amount of resin cured materials without removing the cured resin materials mingling with the waste plastic material. <P>SOLUTION: This regenerated resin obtained by mixing and heating for melting a light-shading component selected from light-shading pigments and light-shading fillers with the crushed waste thermoplastic materials mingled with 0.001-10 wt.% cured resin materials is characterized with that the relationship of the blending amount of the crushed waste thermoplastic plastic material with luminance and light transmittance of the regenerated resin is expressed by a numerical formula (1): log<SB>10</SB>(M)≤(-0.0146×S+1.62), provided that M=(A×B/100), wherein A: luminance of the regenerated resin (%), B: light transmittance of the regenerated resin (%), S: blending ratio of the crushed waste plastic material (wt.%). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a black, white or chromatic recycled resin obtained from a pulverized thermoplastic waste plastic mixed with a small amount of a cured resin and a method for producing the same.

  In recent years, in order to reduce the burden on the environment, it has been required to reuse synthetic resin products represented by automobile parts and home appliance parts for synthetic resin materials. We are considering effective reuse. Reuse of synthetic resin products for synthetic resin materials is generally made of thermoplastic resin, so the synthetic resin products are pulverized into pulverized products, heated and melted, and then granulated. It is used as.

  For example, Patent Document 1 and Patent Document 2 include a high-density polyethylene resin, a high-density polyethylene resin, and a paint waste plastic part made of a polypropylene resin modified with a proportion of ethylene-propylene copolymer rubber of 10 to 40% by weight. A method for reusing a coated resin characterized by blending a low density polyethylene resin is disclosed.

  Patent Document 3 discloses (A) an aromatic polycarbonate resin recovered from an unnecessary optical information recording medium whose substrate is an aromatic polycarbonate resin, and the recovered aromatic measured by the method specified in the text. A total of 100 weights of recovered aromatic polycarbonate resin 90 to 30% by weight (component a) and (B) 10 to 70% by weight of inorganic pigment (component b) in which the foreign matter in the polycarbonate resin is 0.01 to 0.1% by weight. %, A colored master resin composition is disclosed.

Japanese Patent Application Laid-Open No. 2000-281846 Japanese Patent Application Laid-Open No. 2000-281846 JP 2000-327896 A

In recent years, in order to reduce the burden on the environment, there has been a demand for reuse of synthetic resin materials of synthetic resin products represented by automobile parts and home appliance parts, and many companies have made effective use of such synthetic resin materials. We are considering reusing it.
Such synthetic resin products are generally called waste plastics. When reusing waste plastic containing resin cured products such as paint films for bumpers for automobiles, the resin cured product mixed in the waste plastic appears on the surface of the molded product after being melted by heating. Therefore, the reuse application is limited or cannot be reused.
For this reason, it has been studied to remove and reuse the cured resin by various methods. In addition, a method of using a small amount of waste plastic containing a cured resin in a new resin has been studied.

  The present invention provides a recycled resin from which a molded product having an excellent appearance can be obtained without using a pulverized waste plastic mixed with a small amount of a cured resin to remove the cured resin mixed with the waste plastic. Objective.

  The inventor of the present invention mixes and heat-melts a light shielding component selected from a light shielding pigment and a light shielding filler into a pulverized waste plastic to be recycled in which a small amount of a cured resin is mixed. The recycled resin obtained in this way pays attention to the blending ratio of the waste plastic pulverized product to be recycled and the relationship between the lightness and light transmittance of the recycled resin, and a black, white or chromatic colored recycled resin showing an excellent appearance is obtained. I found out that

In the first aspect of the present invention, a pulverized product of thermoplastic waste plastic in which 0.001 to 10% by weight of a resin cured product is mixed,
It is a recycled resin obtained by mixing and heat-melting a light shielding component selected from a light shielding pigment and a light shielding filler,
To provide a recycled resin characterized in that the relationship between the blending amount of thermoplastic waste plastic pulverized product and the brightness and light transmittance of the recycled resin is represented by the following mathematical formula (1).

The second of the present invention is a pulverized product of thermoplastic waste plastic in which 0.001 to 10% by weight of a resin cured product is mixed,
A method for producing a recycled resin obtained by mixing and heat-melting a light-shielding component selected from a light-shielding pigment and a light-shielding filler,
As shown in the following formula (1), the blending amount of the thermoplastic waste plastic pulverized product and the lightness and light transmittance of the obtained recycled resin are represented by the following formula (1). Provided is a method for producing a recycled resin, characterized by adjusting the addition amount of a shielding component.

Preferred embodiments of the recycled resin of the present invention and the recycled resin production method of the present invention will be described below. A plurality of preferred embodiments of the recycled resin of the present invention and the recycled resin production method of the present invention shown below can be combined.
1: The light shielding component contains at least one light shielding pigment selected from a white pigment, a black pigment, and a chromatic pigment.

2: Recycled resin is black, white or chromatic.
3: In heat melting, a thermoplastic resin and / or an elastomer are mixed.
4: The thermoplastic waste plastic pulverized product contains a thermoplastic resin selected from the group consisting of polyolefin, polyester, polystyrene, ABS resin, and polyamide.
5: The thermoplastic waste plastic pulverized product contains a component selected from an elastomer and a filler.
6: The thermoplastic waste plastic pulverized product is an automobile bumper.

A molded article such as injection molding can be obtained from the recycled resin of the present invention.
The recycled resin obtained from the method for producing a recycled resin according to the present invention can provide a molded product such as injection molding.

The recycled resin of the present invention is excellent in the appearance of the resulting molded product.
The recycled resin of the present invention is a black, white or chromatic colored recycled resin.
In the present invention, the color of the waste plastic to be used can be newly adjusted and reproduced.

The method for producing a recycled resin of the present invention can produce a recycled resin having an excellent appearance of the obtained molded product.
The method for producing a recycled resin of the present invention can produce a black, white or chromatic colored recycled resin.
The method for producing a recycled resin according to the present invention can produce a recycled resin that is regenerated by newly adjusting the color of the waste plastic to be used.

  The recycled resin of the present invention is blended with waste plastic pulverized material mixed with a small amount of resin cured material, and a new pigment or filler having light-blocking properties, and if necessary, a thermoplastic resin or an elastomer. Resin.

The recycled resin of the present invention comprises 1 to 100% by weight of waste plastic pulverized product, 0 to 99% by weight of thermoplastic resin and 0 to 40% by weight of elastomer (the total of pulverized product, thermoplastic resin and elastomer is 100% by weight). ) And a light shielding pigment (one or more of black pigment, white pigment, chromatic pigment, etc.) or a light shielding filler,
The recycled resin is characterized in that the relationship between the blended amount of the pulverized thermoplastic waste plastic and the brightness and light transmittance of the recycled resin is expressed by the following mathematical formula (1).
The blending ratio (% by weight) of the pulverized waste plastic in the following formula (1) is:
It is shown by the following mathematical formula (2).

  In the present invention, it is preferable to add at least one component selected from new thermoplastic resins and elastomers to the pulverized waste plastic because the physical properties such as mechanical properties of the obtained recycled resin molding are improved.

  Examples of pulverized waste plastics to be recycled in the present invention include automobiles such as unnecessary parts generated during resin molding (molding) and during processing, used instrument panels, bumper, molding parts such as bumpers and moldings, etc. Examples thereof include pulverized products of used resin materials collected from parts, home appliances, industrial members, building materials such as houses, and the like. In particular, a pulverized resin material collected from used automobile products such as black and chromatic colors, household electrical appliances, industrial members, building materials such as houses, and the like is a target for regeneration.

  In the present invention, the pulverized waste plastic to be recycled is a cured resin molding film (eg, acrylic resin, urethane resin, unsaturated polyester resin, alkyd melamine) attached to the surface of a synthetic resin product made of thermoplastic resin. It is a pulverized product of resin product waste containing a coating film of resin, acrylic melamine resin, etc., including a cured resin molded product obtained by curing a curable resin using heat, light (including ultraviolet rays), a curing catalyst, and the like.

  Representative examples of waste plastics that are the main target of recycling technology include used bumpers collected from automobiles and recovered bumpers due to process losses that can no longer be used due to defects in the bumper production process. . The used bumper and the recovered bumper are not particularly limited, but preferably include a crystalline propylene resin, an elastomer, and a pigment. For example, it is possible to use a recovery bumper containing 40 to 90% by weight of a crystalline propylene resin and 10 to 60% by weight of an elastomer, and 0 to 20% by weight of a resin component other than the crystalline propylene resin and the elastomer. I can do it. The recovered bumper can recycle waste plastic pulverized material containing black pigment such as carbon black, and more preferably 2 parts by weight or less of carbon black with respect to 100 parts by weight of the plastic component (resin component + elastomer component). Can be used in an amount of 1.5 parts by weight or less, more preferably 1 part by weight or less, particularly preferably 0.6 parts by weight or less. The recovery bumper is 1.5 parts by weight or less, more preferably 1 part by weight or less, more preferably 0.5 parts by weight of the pigment excluding carbon black with respect to 100 parts by weight of the plastic component (resin component + elastomer component). Hereinafter, it is particularly preferable to use a material containing 0.3 parts by weight or less. The recovery bumper is 50 parts by weight or less of filler such as talc, more preferably 40 parts by weight or less, more preferably 30 parts by weight or less, and particularly preferably 20 parts by weight with respect to 100 parts by weight of the plastic component (resin component + elastomer component). The thing containing below a part can be used. The recovery bumper has a melt flow rate (MFR) measured by ASTM D1238 (temperature 230 ° C., specific gravity 2.16 kg), preferably 1 to 100 g / 10 min, more preferably 3 to 70 g / 10 min, particularly preferably What uses a thermoplastic resin as a resin material for 5-50 g / 10min can be used.

  The waste plastic pulverized product containing the black pigment to be reused in the present invention is an L * of the melt-molded product of 20.00 to 37.00, a * of -1.00 to 0.40, b *. Is a pulverized product having a value of -1.50 to 0.60, more preferably L * of the melt-molded product is 23.00 to 36.00, a * is -0.70 to 0.10, b *. Is a pulverized product having a ratio of -1.20 to 0.20, and more preferably, L * of the melt-molded product is 23.00 to 33.00, a * is -0.70 to 0.10, b *. Pulverized product having a ratio of -1.20 to 0.20, particularly preferably L * of the melt-molded product is 23.00 to 28.00, a * is -0.70 to 0.10, and b * is- It is a pulverized product that becomes 1.20 to 0.20.

  The cured resin such as a coating film contained in the waste plastic pulverized product is 70% by weight or more of the cured resin, more preferably 80% by weight or more, more preferably 90% by weight or more, and particularly preferably 95% by weight or more. The length of the long side of the cured resin such as a coating film is 7 mm or less, preferably 5 mm or less, more preferably 3 mm or less, more preferably 2 mm or less, and particularly preferably 1.3 mm or less. It is preferable because a molded product having excellent productivity and excellent appearance can be obtained.

  The cured resin such as a coating film contained in the recycled resin obtained by the present invention or a molded product obtained from the recycled resin is 70% by weight or more, more preferably 80% by weight or more, more preferably 90% by weight of the cured resin. % Or more, particularly preferably 95% by weight or more, the size of the long side of the cured resin is 3 mm or less, more preferably 2 mm or less, more preferably 1.3 mm or less, particularly preferably 1.0 mm or less. It is preferable because a molded article having excellent mechanical properties such as impact strength and excellent appearance can be obtained.

  The pulverized waste plastics to be reclaimed in the present invention includes, in addition to the cured resin, inorganic particulates such as sand having a long piece of 1.5 mm or less, plant pieces, metal pieces, resin decomposition products, metal oxides, etc. Those containing a mixture of insolubles can also be used.

As the light shielding component that can be added to the pulverized waste plastic, a light shielding component selected from pigments having light shielding properties and fillers having light shielding properties can be used.
As the light shielding component, a light shielding pigment is preferable.

  As the pigment having a light shielding property, a white pigment, a chromatic pigment, a black pigment, or the like can be used. Two or more of these pigments can be blended. In particular, it is preferable to blend at least one pigment selected from carbon black and titanium dioxide as a light-impervious pigment in order to obtain a chromatic resin having a changed color tone.

  Examples of white pigments include titanium dioxide (titanium oxide), lead white, and zinc oxide. Particularly preferred is titanium dioxide.

  As titanium dioxide, those conventionally used for pigments can be used without limitation, and for example, those produced by the chlorine method or sulfuric acid method can be used. The thing manufactured by the chlorine method is preferable. The particle shape is not particularly limited, but tetragonal, rutile, and anatase types can be used, and tetragonal and rutile types are particularly preferable. The average particle diameter is not particularly limited, but is preferably 0.01 to 0.5 μm, more preferably 0.05 to 0.5 μm, more preferably 0.1 to 0.4 μm, and particularly preferably 0.2 to 0.00. 3 μm is preferable because it is excellent in dispersibility, handleability and workability. The DOP oil absorption amount of titanium dioxide is not particularly limited, but is preferably 5 to 40 (cc / 100 g), more preferably 8 to 30 (cc / 100 g), more preferably 10 to 20 (cc / 100 g), particularly preferably. Is 12 to 18 (cc / 100 g).

  Known pigments can be used without limitation, for example, inorganic pigments such as metal oxides, hydroxides, sulfides, chromates, carbonates, sulfates and silicates; azo series, diphenylmethane series And organic pigments such as triphenylmethane, phthalocyanine, nitro, nitroso, anthraquinone, quinacridone red, benzidine, and condensed polycyclic. Further, it may be colored fibers or glossy metal particles. There is no restriction | limiting in particular about the hue of a chromatic color pigment, Any things, such as yellow, blue, red, and green, can be used. Two or more kinds of these pigments can be used in combination.

  Specific examples of chromatic pigments that can be used in the present invention include inorganic pigments such as petals, ultramarine blue, cobalt blue, titanium yellow, bitumen, zinc sulfide, barium yellow, cobalt blue, and cobalt green; quinacridone red, polyazo Yellow, anthraquinone red, anthraquinone yellow, polyazo red, azo lake yellow, berylene, phthalocyanine blue, phthalocyanine green, isoindolinone yellow, watching red, permanent red, para red, toluidine maroon, benzidine yellow, fast sky blue, brilliant carmine 6B Organic pigments such as, colored fibers, glossy metal particles, and the like. These pigments can be used in combination of two or more.

  The average particle diameter of titanium yellow is not particularly limited, but is preferably 0.1 to 1.5 μm, more preferably 0.5 to 1.3 μm, more preferably 0.7 to 1.1 μm, and particularly 0.8 to 1 μm. Is preferable because it is excellent in dispersibility, handleability, and workability. The DOP oil absorption amount of titanium yellow is not particularly limited, but is preferably 15 to 40 (cc / 100 g), more preferably 20 to 35 (cc / 100 g), and particularly preferably 20 to 30 (cc / 100 g). It is. The pH of titanium yellow is not particularly limited, but is preferably in the range of 6 to 10, particularly preferably 7 to 9.

  As the ultramarine, those conventionally used for pigments can be used without limitation. The average particle diameter of ultramarine is not particularly limited, but is preferably 0.1 to 5 μm, more preferably 0.5 to 4 μm, more preferably 0.8 to 3.5 μm, and particularly preferably 1 to 3 μm. . These are preferable because they are excellent in dispersibility, handleability and workability. The DOP oil absorption amount of ultramarine is not particularly limited, but is preferably 20 to 50 (cc / 100 g), more preferably 25 to 40 (cc / 100 g), and particularly preferably 30 to 35 (cc / 100 g). Although ultramarine PH is not particularly limited, it is preferably in the range of 5 to 11, more preferably 5.5 to 11, and particularly preferably 7 to 11.

  As the phthalocyanine blue, those conventionally used for pigments can be used without limitation, and those produced by, for example, the Waller method or the phthalonitrile method can be used. The particle shape of phthalocyanine blue is not particularly limited, but α type, β type, and the like can be used. The average particle size of phthalocyanine blue is not particularly limited, but is preferably 0.01 to 2 μm, more preferably 0.05 to 1.5 μm, more preferably 0.1 to 0.4 μm, and particularly preferably 0.1 to 1 μm. Range.

  As the phthalocyanine green, those conventionally used for pigments can be used without limitation, and for example, those produced by the Waller method or the phthaloetril method can be used. The particle shape of phthalocyanene green is not particularly limited, but α type, β type, and the like can be used. The average particle size of phthalocyanine green is not particularly limited, but is preferably 0.01 to 2 μm, more preferably 0.05 to 1.5 μm, more preferably 0.1 to 0.4 μm, and particularly preferably 0.1 to 0.1 μm. The range is 1 μm. The pH of phthalocyanine green is not particularly limited, but is preferably 4 to 9, and more preferably 4 to 8.

  As the petal, those conventionally used for pigments can be used without limitation. The particle shape of the petal is not particularly limited, but an equiaxed crystal system or the like can be used. The average particle diameter of the petal is not particularly limited, but is preferably 0.01 to 1 μm, more preferably 0.05 to 0.5 μm, more preferably 0.08 to 0.4 μm, and particularly preferably 0.1 to 0.1 μm. The range is 0.3 μm. The amount of DOP oil absorption of the petal is not particularly limited, but is preferably 10 to 50 (cc / 100 g), more preferably 12 to 40 (cc / 100 g), and particularly preferably 15 to 30 (cc / 100 g). is there. The pH of the valve is not particularly limited but is preferably in the range of 4-8, more preferably 5-7.

As quinacridone red, those conventionally used for pigments can be used without limitation. The particle shape of quinacridone red is not particularly limited, and α-type, β-type, γ-type and the like can be used. The average particle size of quinacridone red is not particularly limited, but is preferably 0.01 to 2 μm, more preferably 0.05 to 1.5 μm, and particularly preferably 0.1 to 1 μm.
As anthraquinone red, those conventionally used for pigments can be used without limitation. The average particle size of anthraquinone red is not particularly limited, but is preferably 0.01 to 2 μm, more preferably 0.05 to 1.5 μm, and particularly preferably 0.1 to 1 μm. Although not limited to the pH of anthraquinone red, it is preferably in the range of 4-9.

  Examples of black pigments include carbon black and iron black. The black pigment can impart high light shielding properties to the recycled resin molded product. Two or more black pigments can be used in combination.

  As carbon black, those conventionally used for pigments can be used without limitation, such as carbon black, acetylene black, lamp black, channel black, ketjen black, etc. produced by the furnace method or channel method. Can be used. Carbon black can be oxidized. As carbon black, it is particularly preferable to use furnace black produced by the furnace method because it has excellent appearance uniformity, excellent dispersibility, and the effect of improving the blackness and gloss of the resulting shaped product is large. . The average particle size of carbon black is not particularly limited, but is preferably 0.001 to 0.3 μm, more preferably 0.005 to 0.2 μm, more preferably 0.01 to 0.1 μm, and particularly preferably 0.00. Those having a thickness of 01 to 0.03 μm are preferable because they are excellent in dispersibility, handleability, and workability, and exhibit high effects in improving blackness and gloss.

  As the iron black, black iron oxide obtained by a firing method can be used. The particle shape of the iron black is not particularly limited, but a polyhedral shape such as an octahedron, a spherical shape, or the like can be used, and an octahedron is particularly preferable. The average particle size of iron black is not particularly limited, but is preferably 0.05 to 0.4 μm, more preferably 0.15 to 0.35 μm, and particularly preferably 0.2 to 0.35 μm. The DOP oil absorption amount of iron black is not particularly limited, but is preferably 10 to 80 (cc / 100 g), more preferably 15 to 50 (cc / 100 g), more preferably 20 to 40 (cc / 100 g), and particularly preferably. Is in the range of 25-35 (cc / 100 g). The pH of the iron black is not limited, but is preferably 9 to 11, and particularly preferably 9 to 10.

  The white pigment, black pigment, and / or chromatic color pigment may be added directly as they are, or the pigment may be added as a master batch. A masterbatch technique using a pigment and a resin component is already known.

  If desired, a filler may be added to the pulverized resin product, and the addition is preferable in order to improve the physical properties of the recycled resin molded product. Two or more kinds of fillers can be used in combination.

  The light-impervious filler is not particularly limited as long as it is blended in a resin and blocks light, and organic fillers and inorganic fillers can be used.

Inorganic fillers include talc, clay, mica, silica, diatom, moss heidi, tismo, wollastonite, montmorillonite, bentonite, dolomite, dosonite, silicates, carbon fiber, glass (including glass fiber), barium ferrite , Beryllium oxide, Aluminum hydroxide (magnesium hydroxide, basic magnesium carbonate, calcium carbonate, magnesium carbonate, magnesium sulfate, calcium sulfate, barium sulfate, ammonium sulfate, calcium sulfite, calcium oxalate, molybdenum sulfide, zinc borate, metaboric acid Barium, calcium borate, sodium borate, etc., or zinc, copper, iron, lead, aluminum, nickel, chromium, titanium, manganese, tin, platinum, tungsten, gold, magnesium, cobalt, Metals such as trontium and their metal oxides, alloys such as stainless steel, solder and brass, powders of metal ceramics such as silicon carbide, silicon nitride, zirconia, aluminum nitride and titanium carbide, fibrous whiskers and fibers Can be used.
The light-impervious filler is preferably an inorganic filler, and talc, mica, calcium carbonate and the like are preferable.

  When reclaiming the waste plastic powder of the present invention, additives and dispersants such as lubricants, antistatic agents, surfactants, nucleating agents, ultraviolet absorbers, antioxidants, flame retardants, and the like are necessary. Etc. can be added.

  Examples of the dispersant include higher fatty acids, higher fatty acid amides, metal soaps, glycerin esters, polyethylene waxes, and polypropylene waxes.

  Examples of additives include phenolic, phosphorus, sulfur and other antioxidants, UV absorbers such as benzophenone and benzotriazole, light stabilizers such as HALS, and phosphorus and halogen flame retardants. I can do it.

  When the pulverized product of the waste plastic of the present invention is regenerated, as described above, a thermoplastic resin and / or an elastomer can be added and blended as necessary. The thermoplastic resin or elastomer to be added and blended is desirably the same resin as the resin material of the synthetic resin product or an equivalent resin. Therefore, examples of thermoplastic resin materials that can be used to recycle waste plastics are olefin resins (eg, high density polyethylene, low density polyethylene, crystalline polypropylene), polycarbonate resins, polyurethane resins, styrene. Resin, ABS resin (acrylonitrile-butadiene-styrene resin), polyester resin such as polybutylene terephthalate, polyethylene terephthalate, polyphenyl ether resin such as modified polyphenylene ether, polyphenylene sulfide, polymethyl methacrylate, etc. Examples thereof include acrylic resins, polyamide resins such as 6-nylon, 66-nylon, 12-nylon, and 6 · 12-nylon, and polysulfone.

The method for producing a recycled resin according to the present invention includes a pulverized product of thermoplastic waste plastic in which 0.001 to 10% by weight of a resin cured product is mixed.
A method for producing a recycled resin obtained by mixing and heat-melting a light-shielding component selected from a light-shielding pigment and a light-shielding filler,
As shown in the following mathematical formula (1), the blending amount of the thermoplastic waste plastic pulverized product and the lightness and light transmittance of the obtained recycled resin are expressed in the blended amount and light of the thermoplastic waste plastic. It is a method for producing a recycled resin, characterized in that the addition amount of the shielding component is further adjusted as necessary, and the addition amount of the thermoplastic resin and / or elastomer is adjusted.

An example of a method for producing the recycled resin of the present invention is as follows:
(1) Waste plastic pulverized material mixed with raw resin cured products, light shielding components such as pigments and fillers, or any combination of these light shielding components, and if necessary, heat Add plastic resin or elastomer.
At this time, the weight of the waste plastic ground material and the weight of the thermoplastic resin or elastomer are measured.
(2) Melt and knead (1), and then manufacture a test piece directly or via a granular material.
(3) The lightness and light transmittance of the test piece are measured, and whether or not the measurement result is appropriate is determined by Equation (1). When the Log ₁₀ (M) value of the test piece exceeds (−0.0146 × S + 1.65), the process returns to the step (1), and the light shielding component is mainly added. When the Log ₁₀ (M) value of the test piece is (−0.0146 × S + 1.65) or less, it is reused as a recycled resin.
(4) The recycled resin is melted to produce a molded product.
By performing the above operation, a recycled resin that can be used for molding having a desired color tone, appearance, and physical properties can be produced.

In (1) of the method for producing the recycled resin of the present invention, a pulverized waste plastic having a cured resin as a raw material, a light shielding component such as an appropriate amount of pigment or filler, or any combination of these light shielding components And if necessary, the order of addition of the thermoplastic resin, the elastomer and the like can be appropriately selected.
In the production method (1) of the recycled resin of the present invention,
(I) A waste plastic pulverized product having an insoluble material and a light shielding component are previously melt-kneaded, and a thermoplastic resin or an elastomer may be added as necessary.
(Ii) A pulverized waste plastic having an insoluble material and a thermoplastic resin or elastomer may be previously melt-kneaded, and a light shielding component may be added.
(Iii) A light-shielding component and a thermoplastic resin or elastomer may be previously melt-kneaded, and a waste plastic pulverized product having an insoluble material may be added.
The order of addition and melting of these components can be appropriately selected.

  In the present invention, there are no particular restrictions on the method of mixing the pulverized waste plastics and each component, the mixing apparatus, and the mixing equipment. Known single-screw extruder (kneader), twin-screw extruder (kneader), Mixing and / or kneading equipment such as tandem kneading equipment, calender, Banbury mixer, kneading roll, brabender, plastograph, kneader, etc., in which a twin screw extruder and a single screw extruder (kneader) are connected in series are used. I can do it.

  The recycled resin obtained in the present invention is formed by using a known molding method such as extrusion molding, sheet molding, injection molding, injection compression molding, gas injection injection molding, probe molding, vacuum molding, bumper, molding, door trim, Automotive parts such as instrument panels, trims, console boxes, etc., automotive parts such as batteries, engine compartment parts such as fan shrouds, interior / exterior parts of household electrical appliances, interior / exterior parts of residential building materials, cushioning materials, packaging It can be reused as a molded product used for a member. In the method for reusing waste plastic according to the present invention, the molded product obtained can be a molded product having a glossy surface, a molded product having irregularities and patterns such as a drawing, a molded article having smooth irregularities and patterns, and the like. .

  EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated, this invention is not limited to these Examples.

(1) Measurement of brightness and hue:
Recycled pellets produced with a twin-screw kneader were used with an injection molding machine with a clamping force of 130 tons, mold: square plate (100 × 100 × 3 mmt; single side: skin-like shape, single side: mirror surface), molding temperature: C1- C2-C3-C4 = 180-190-200-210 ° C., injection pressure: P1-P2-P3-P4 = 108-98-88-78 MPa, injection speed: V1-V2-V3-V4 = 30-30-20 -20%, screw back pressure: free, screw rotation speed: 60%, mold temperature: 40 ° C, cycle: injection 10 seconds, cooling 20 seconds, 25 shots are continuously molded, 6-20 shots injection A molded article (test piece A) was collected. Using the spectrophotometer (light source: D-6510 degree field of view) of Kurashiki Boseki Co., Ltd., the aperture side of the obtained specimen A of the 10th shot was used, and the brightness L *, hue a *, hue b * (CIE1976). ) Was measured. The lightness L * (%) was defined as the lightness (%).

(2) Measurement of light transmittance:
Using a hot press molding machine with a clamping force of 40 tons, the recycled pellets produced with a twin-screw kneader were sandwiched between photographic ferrotype plates (spacer 70 x 50 x 0.05 mmt). Heating plate temperature 230 ° C, preheating time 2 minutes Defoaming treatment time 1 minute, pressurization time 1 minute (pressure: 100 kg / cm ² ), cooling temperature 20 ° C., cooling time 2 minutes, forming a film of 50 ± 3 μm for total light transmittance measurement It was set as the test piece B.
The total light transmittance of this test piece B was measured using a turbidimeter (Nippon Denshoku Industries Co., Ltd. turbidimeter NDH2000), and the total light transmittance (%) was defined as the light transmittance (%). A halogen lamp with a rating of 5V9W was used as a light source, and an opening diameter of a light incident part was 20 mmφ, and five points on the film were measured and averaged.

(2) Appearance evaluation method of the stop surface of the test piece A:
The appearance defect occurrence rate due to the presence of the coating film on the surface of the injection molded product was evaluated. The surface of 6 to 20 shots of test piece A was visually observed and evaluated as follows.
1: All molded products have a coating film that is not noticeable or a coating film that stands out.
2: 50% of the molded product is inconspicuous,
3: 10% of the molded product is inconspicuous,
4: The molded product of 5% or less is less noticeable.
5: All molded products are not coated with Hitachi,
6: The diaphragm surface and mirror surface of all molded products are not coated with Hitachi.

[Examples 1-4, Comparative Examples 1-3]
・ Materials used (1) Waste plastic containing recovered coating film
As a pulverized waste plastic mixed with a coating film to be recycled, a polypropylene automobile bumper cleaning product collected from the market was pulverized to 5 to 16 mm.
The waste plastic pulverized product to be recycled is melt kneaded using a twin-screw kneader (UME 40-48T manufactured by Ube Industries Co., Ltd.) at a barrel temperature of 220 ° C. and a processing amount of 60 Kg / h, and then waste plastic pellets. Got. This waste plastic pellet was a polypropylene resin having an MFR of 26 g / 10 min and containing about 10% by weight of talc.
The amount of coating film in the waste plastic pulverized product to be recycled is 10 g of waste plastic pellets placed in a 500 cc eggplant-shaped flask, and 500 cc p-xylene is injected, followed by boiling and stirring for 30 minutes to dissolve the adhered resin. Then, it was about 1.4% by weight when immediately obtained using an aspirator type filter by hot filtration with 5A filter paper and measuring the filtration residue.
The waste plastic pellets had L * of 25.55, a * of −0.19, and b * of −0.52.

(2) Pigment:
1) Petal: average particle size 0.16 μm, DOP oil absorption 23 (CC / 100 g), pH 5-7.
2) Titanium dioxide: average particle size 0.22 μm, DOP oil absorption 14 (CC / 100 g), pH 5.5 to 7.5.
3) Titanium yellow: average particle size 0.91 μm, DOP oil absorption 25 (CC / 100 g), pH 7.8.
4) Carbon black: average particle size 0.017 μm (furnace method).
5) Quinacridone red has a β-type pH of 8.5 to 9.5.
6) Phthalocyanine blue is of α type.
7) Phthalocyanine green has an α-type DOP oil absorption of 39.3 (cc / 100 g) and a pH of 7.

(3) Inorganic filler 1) Talc has an average particle diameter (laser diffraction method) of 2.7 μm.
(4) Thermoplastic resin 1) Polypropylene (H-PP) is crystalline polypropylene (homo) [melt flow rate (MFR): 30 g / 10 min, pendant fraction: 96.0%].

(5) Other additive components:
1) Dispersant: calcium stearate.
2) Antioxidants: Irgafos 168, Irganox 1010.

・ Production of recycled resin:
A biaxial kneader after dry blending the waste plastic crushed material, thermoplastic resin and pigment, the dispersant, and the antioxidant in the proportions shown in Table 1 using a blender made by Platec. (Ube Industries, Ltd .: UME40-48T) was used for melt-kneading under conditions of barrel temperature: 220 ° C. and throughput: 60 Kg / hour to obtain recycled pellets.
After molding the obtained recycled pellets, the brightness, a * and b * of the test piece A, and the light transmittance of the test piece B were measured, and the results are shown in Table 2. A test piece A was produced from the recycled pellets, the appearance was evaluated, and the results are shown in Table 2.

Claims (10)

To the pulverized product of thermoplastic waste plastic containing 0.001 to 10% by weight of cured resin
It is a recycled resin obtained by mixing and heat-melting a light shielding component selected from a light shielding pigment and a light shielding filler,
A recycled resin, wherein the blending ratio of the pulverized product of thermoplastic waste plastic and the relationship between the lightness and light transmittance of the recycled resin are represented by the following formula (1).

  2. The recycled resin according to claim 1, wherein the light shielding component contains at least one kind of light shielding pigment selected from a white pigment, a black pigment, and a chromatic pigment.   The recycled resin according to any one of claims 1 and 2, wherein the recycled resin is black, white or chromatic.   The recycled resin according to any one of claims 1 to 3, wherein a thermoplastic resin and / or an elastomer are mixed in the heat melting.   The recycled waste plastic material according to any one of claims 1 to 4, wherein the pulverized thermoplastic waste plastic contains a thermoplastic resin selected from the group consisting of polyolefin, polyester, polystyrene, ABS resin, and polyamide. resin.   The recycled resin according to claim 1, wherein the pulverized thermoplastic waste plastic contains a component selected from an elastomer and a filler.   A molded product of the recycled resin according to claim 1. To the pulverized product of thermoplastic waste plastic containing 0.001 to 10% by weight of cured resin
A method for producing a recycled resin obtained by mixing and heat-melting a light-shielding component selected from a light-shielding pigment and a light-shielding filler,
The blending ratio of the pulverized product of the thermoplastic waste plastic and the blended amount of the pulverized product of the thermoplastic waste plastic as shown in the following formula (1), as the relationship between the lightness and light transmittance of the obtained recycled resin A method for producing a recycled resin, comprising adjusting the amount of light shielding component added.

  The method for producing a recycled resin according to claim 8, wherein the light shielding component contains at least one kind of light shielding pigment selected from a white pigment, a black pigment, and a chromatic pigment. The method for producing a recycled resin according to any one of claims 8 and 9, wherein the recycled resin is black, white or chromatic.