JP2019163354A - Resin composition, method for producing resin composition, and molded body - Google Patents

Abstract

To provide a resin composition which uses a reproduced carbon fiber, and can form a molded body that has physical properties equal to or higher than a molded body using a virgin carbon fiber by extrusion molding, injection molding and the like, in particular, light-weight property, bending elastic modulus, impact strength and conductivity, and prevents a tensile strength from greatly lowering compared to the molded body using the virgin carbon fiber.SOLUTION: A resin composition is obtained using a resin and a reproduced carbon fiber which has a fiber length variation coefficient of 20% or more and contains no sizing agent.SELECTED DRAWING: None

Description

  The present invention relates to a resin composition, a method for producing the resin composition, and a molded body.

  Carbon fiber reinforced plastics are used in many products because they are lightweight and have excellent mechanical properties. For this reason, many wastes (hereinafter, also referred to as “waste carbon fiber reinforced plastics”) of molded articles containing carbon fiber reinforced plastics are generated, and the treatment thereof is a big problem.

  Since carbon fiber is expensive, if carbon fiber can be reused from waste carbon fiber reinforced plastic, it is inexpensive to use recycled carbon fiber (hereinafter also referred to as “recycled carbon fiber”) along with the treatment of waste carbon fiber reinforced plastic. Since there is a possibility that a new carbon fiber reinforced plastic can be produced, methods for obtaining recycled carbon fiber from waste carbon fiber reinforced plastic have been studied (for example, Patent Documents 1 and 2).

JP 2013-64219 A JP 7-33904 A

As described in Patent Documents 1 and 2, a method for obtaining recycled carbon fiber from waste carbon fiber reinforced plastic is known. However, since the obtained recycled carbon fiber is a recycled product, it is mixed with a resin. At present, it has not been easy to mold a molded body made of a new carbon fiber reinforced plastic by a mass production method such as extrusion molding or injection molding.
Moreover, even if it was able to shape | mold, the molded object obtained had the physical property reduced significantly compared with the molded object using the carbon fiber of virgin.

  The present invention has been made in view of the above-mentioned problems, using regenerated carbon fiber, by extrusion molding, injection molding or the like, physical properties equivalent to or higher than those using a virgin carbon fiber, in particular, lightweight, It is an object of the present invention to provide a resin composition that has a flexural modulus, impact strength, and electrical conductivity, and that can form a molded body that does not significantly reduce tensile strength as compared with a molded body using virgin carbon fibers. To do.

As a result of intensive studies to solve the above problems, the present inventors have found that the above problems can be solved according to the following configuration example, and have completed the present invention.
A configuration example of the present invention is as follows.

[1] a resin;
A resin composition obtained using a regenerated carbon fiber having a fiber length variation coefficient of 20% or more and containing no sizing agent.

[2] The resin composition according to [1], wherein the regenerated carbon fiber has a fiber length of 1 to 15 mm.
[3] The resin composition according to [1] or [2], wherein the regenerated carbon fiber is a thermal decomposition product of waste carbon fiber reinforced plastic.

  [4] The composition according to any one of [1] to [3], wherein the resin is at least one resin selected from a propylene resin, a polyphenylene ether resin, and an amide resin.

  [5] The composition according to any one of [1] to [4], comprising a compatibilizing agent.

  [6] The composition according to any one of [1] to [5], including 1 to 30% by mass of the regenerated carbon fiber with respect to 100% by mass of the resin and the regenerated carbon fiber.

[7] A method for producing a resin composition, comprising the following steps 1 and 2.
Step 1: Step 1 of kneading a component containing a resin
Process 2: The process of kneading the kneaded material obtained in Process 1 and the regenerated carbon fiber not containing the sizing agent

  [8] The production method according to [7], wherein the regenerated carbon fiber is a fiber obtained by pyrolyzing waste carbon fiber reinforced plastic.

[9] A molded article of the composition according to any one of [1] to [6].
[10] The molded article according to [9], which satisfies the following requirement (1).
Requirement (1): The tensile strength (Tn) measured on the basis of ASTM-D790 of the same molded product as described in [9] except that virgin carbon fiber was used instead of recycled carbon fiber, [ 9] The ratio (Tr / Tn) of the tensile strength (Tr) measured based on ASTM-D790 of the molded product according to 9] is 0.65 or more

According to the present invention, recycled carbon fibers are used, and by extrusion molding or the like, they have physical properties that are equal to or higher than those of molded products using virgin carbon fibers, in particular, light weight, bending elastic modulus, impact strength, and conductivity. In addition, compared with a molded body using virgin carbon fibers, a molded body whose tensile strength does not significantly decrease can be easily formed at a low cost.
Further, according to the present invention, it is possible to obtain a molded article having excellent rigidity and light weight, and further, a conductive molded article with reduced burden on the human body and the environment with reduced powder falling can be obtained at low cost.

≪Resin composition≫
The resin composition according to the present invention (hereinafter also referred to as “the present composition”) has a resin (hereinafter also referred to as “resin (A)”), a fiber length variation coefficient of 20% or more, and a sizing agent. It is the composition obtained using the reproduction | regeneration carbon fiber which does not contain.

The composition may be a composition for forming a molded body using the composition itself (hereinafter also referred to as “molding composition”), or may be a so-called master batch.
The master batch generally refers to a pellet in which a solid component such as regenerated carbon fiber is contained in a base resin at a high concentration. Various resins can be used as the base resin. In the present invention, it is preferable to use the resin (A) as the base resin. The content rate of the solid component in a masterbatch is 20-70 mass% normally, Preferably it is 30-60 mass%.

The masterbatch is usually diluted with a component containing the same resin as the base resin (hereinafter, the component that dilutes the masterbatch is also referred to as “diluted component”). Specifically, the mass of the masterbatch Is diluted with the diluting component in an amount such that the ratio of the mass of the diluting component to the mass of the diluting component (mass of the master batch: mass of the diluting component) is preferably 1: 1 to 10, more preferably 1: 1 to 5, particularly preferably Each of the following components is diluted with a diluting component so as to have the following content to obtain a molding composition.
The following content descriptions are preferred ranges for the molding composition.

<Resin (A)>
The present composition contains at least one resin (A). Resin (A) is a resin as a main component in the composition.
The resin (A) contained in the present composition may be one type or two or more types.
The resin (A) is not particularly limited and may be appropriately selected depending on a desired application. For example, a propylene resin, a polyphenylene ether resin, an amide resin, an ester resin, a styrene resin, an ABS resin Examples thereof include resins, phenylene sulfide resins, ether sulfone resins, ether ether ketone resins, biodegradable plastics, and polycarbonate resins. Among these, a propylene-based resin, a polyphenylene ether-based resin, and an amide-based resin are preferable from the viewpoint that a molded article having desired physical properties can be easily obtained.

The content of the resin (A) in the composition may be appropriately selected according to the desired application, but is preferably 70 to 99% by mass with respect to 100% by mass of the resin (A) and the regenerated carbon fiber. More preferably, it is 75-97 mass%, Most preferably, it is 75-95 mass%.
When content of resin (A) exists in the said range, the composition excellent in workability and a moldability is obtained, and the molded object which fully exhibits the characteristic of resin can be obtained easily.

[Propylene resin]
The propylene-based resin is not particularly limited, and may be any one of a propylene homopolymer, a block copolymer, and a random copolymer, and may be a modified product of these unsaturated carboxylic acids or derivatives thereof. The modified body is preferred from the viewpoint that it is excellent in compatibility with carbon fiber and can easily obtain a molded body having superior strength and rigidity, and further, it is possible to easily obtain a molded body having superior impact resistance. From the viewpoint of being able to do so, a modified product of the block copolymer with an unsaturated carboxylic acid or a derivative thereof is preferable.
Propylene-type resin may be used individually by 1 type, and may use 2 or more types.

The copolymer is obtained by copolymerizing propylene and a comonomer copolymerizable with propylene. Examples of the comonomer include olefins such as ethylene, butene, pentene, hexene, and octene. Is ethylene or 1-butene.
Two or more of these comonomers may be used.
The amount of the comonomer used is usually 30% by mass or less, preferably 20% by mass or less, based on 100% by mass of all monomers used for the synthesis of the copolymer (before modification).

The propylene resin is polyethylene, ethylene-propylene copolymer, ethylene-butene copolymer, ethylene-pentene copolymer, ethylene-hexene copolymer, ethylene-octene copolymer, propylene-butene copolymer, Other polymers such as α-olefin copolymers such as propylene-hexene copolymer, propylene-octene copolymer, butene-hexene copolymer, butene-octene copolymer, hexene-octene copolymer, etc. The other polymer may include ethylene / propylene rubber (EPR), modified ethylene / propylene / diene rubber (modified EPDM) and hydrogenated styrene-based thermoplastic from the viewpoint of improving impact resistance. Elastomers such as elastomer (SEBS) are preferred.
The blending amount of the other polymer is usually 40% by mass or less, preferably 30% by mass or less with respect to 100% by mass of the propylene resin.

  The propylene-based resin may be synthesized by a conventionally known method, or a commercially available product such as Prime Polymer Co., Ltd., Nippon Polypro Co., Ltd., Sumitomo Chemical Co., Ltd. or Sun Allomer Co., Ltd. may be used. Good.

Although it does not restrict | limit especially as a modified body by the unsaturated carboxylic acid or its derivative of the said propylene-type resin, It is preferable that the said resin is the resin graft-modified by unsaturated carboxylic acid or its derivative.
The said modified body may be used individually by 1 type, and may use 2 or more types.

  By using the modified body, compatibility between the regenerated carbon fiber and the resin (A) can be increased, so that a molded body having excellent strength and rigidity can be easily formed at low cost without using a compatibilizing agent. Can do.

The unsaturated carboxylic acid is not particularly limited as long as it is a compound having one or more unsaturated groups and one or more carboxy groups.
Examples of the unsaturated group include a vinyl group, a vinylene group, and an unsaturated cyclic hydrocarbon group.
Examples of the unsaturated carboxylic acid include (meth) acrylic acid, maleic acid, fumaric acid, tetrahydrophthalic acid, itaconic acid, citraconic acid, crotonic acid, endocis-bicyclo [2,2,1] hept-5-ene-2. , 3-dicarboxylic acid, methyl-endocis-bicyclo [2,2,1] hept-5-ene-2,3-dicarboxylic acid, and the like.

  Examples of the derivatives include acid anhydrides, acid halides, amides, imides, esters, and the like. Specific examples include maleic anhydride, citraconic anhydride, maleenyl chloride, maleenylimide, monomethyl maleate, dimethyl maleate, and the like. It is done.

  As the unsaturated carboxylic acid or derivative thereof, unsaturated carboxylic acid or acid anhydride is preferable, and maleic acid or maleic anhydride is particularly preferable.

  From the standpoint that the compatibility between the regenerated carbon fiber and the resin (A) can be further improved, the amount of modification by the unsaturated carboxylic acid or derivative thereof in the modified body is preferably 100% by mass of the modified body. Is 0.1% by mass or more, more preferably 0.3% by mass or more, and preferably 20% by mass or less.

[Polyphenylene ether resin]
The polyphenylene ether-based resin is not particularly limited, and may be an unmodified polyphenylene ether-based resin or a modified polyphenylene ether-based resin, but a modified polyphenylene ether-based resin is preferable from the viewpoint that the effects of the present invention are more exerted. .
The polyphenylene ether resins may be used alone or in combination of two or more.

  The unmodified polyphenylene ether is preferably a polyphenylene ether represented by the following formula.

In the above formula, R ¹ and R ² are each independently an alkyl group having 1 to 4 carbon atoms or a halogen atom.
n is a positive integer representing the degree of polymerization, and is usually 10 to 5000.

  Examples of such polyphenylene ethers include poly-2,6-dimethylphenylene-1,4-ether, poly-2,6-diethylphenylene-1,4-ether and poly-2,6-dichlorophenylene-1. , 4-ether.

  The modified polyphenylene ether may be, for example, a modified product obtained by modifying the unmodified polyphenylene ether with a predetermined substituent as described in International Publication No. 2014/203511, and the unmodified polyphenylene ether. And a polymer alloy of a thermoplastic resin such as polystyrene resin.

  Since the unmodified polyphenylene ether resin has a high melting point and is difficult to mold by itself, a polymer alloy with a thermoplastic resin such as a polystyrene resin excellent in compatibility with the polyphenylene ether resin is preferable. In addition, a polymer alloy is preferable from the standpoint that a molded product having a predetermined effect can be obtained easily and inexpensively.

  The polymer alloy may be a polymer alloy of unmodified polyphenylene ether and a thermoplastic resin such as polystyrene, or may be a polymer alloy of the polymer alloy and a thermoplastic resin such as polystyrene.

Examples of the polystyrene resins include high-impact polystyrene (HIPS) such as styrene homopolymer, styrene / butadiene copolymer, styrene / α-methylstyrene copolymer, styrene / (meth) acrylonitrile copolymer, styrene / (Meth) acrylic acid copolymer, styrene / (meth) acrylic acid ester copolymer and the like. Among these, styrene homopolymer or a combination of styrene homopolymer and HIPS is preferable.
The said polystyrene-type resin may be used individually by 1 type, and may use 2 or more types.

The amount of the polystyrene resin used is usually 5 to 30 parts by mass, preferably 10 to 20 parts by mass with respect to 100 parts by mass of the unmodified polyphenylene ether resin.
When the usage-amount of a polystyrene type resin exists in the said range, the characteristic which a polystyrene resin has can be provided, maintaining the outstanding characteristic which a polyphenylene ether resin has.

  The polyphenylene ether-based resin may be synthesized by a conventionally known method, or commercially available products such as those manufactured by Asahi Kasei Corporation, Mitsubishi Engineering Plastics Co., Ltd., or SABIC may be used.

[Amide resin]
The amide resin is not particularly limited, and a conventionally known amide resin can be used. One amide resin may be used alone, or two or more amide resins may be used.
Specific examples of the amide resin include nylon 6, nylon 46, nylon 66, nylon 6/66, nylon 11, nylon 6/11, nylon 12, nylon 6/12, nylon 610, nylon 612, and the like. It is done. Among these, nylon 6 is preferable.

<Recycled carbon fiber>
This composition is characterized by using a regenerated carbon fiber (recycled carbon fiber) having a fiber length variation coefficient of 20% or more and containing no sizing agent.
Virgin carbon fiber contains a sizing agent and has a uniform shape (especially fiber length) that is continuously sized in the spinning process, and has a small coefficient of variation in fiber length. The sizing agent attached to the virgin carbon fiber is lost, and the fiber length and the like vary.
As the regenerated carbon fiber contained in the present composition, two or more kinds of regenerated carbon fibers having different shapes and forming methods may be used.

  The shape of the regenerated carbon fiber is not particularly limited and may be any of a nonwoven fabric, chopped fiber, milled fiber, and the like, but chopped fiber is preferable in consideration of kneadability with the resin (A).

The fiber length of the regenerated carbon fiber is preferably from 1 to 5 because it has desired physical properties, powder falling is suppressed, and a molded body with less burden on the human body and the environment can be easily obtained. It is 15 mm, More preferably, it is 3-15 mm, More preferably, it is 5-15 mm, Most preferably, it is 6-13 mm.
In addition, although this fiber length is the fiber length of the regenerated carbon fiber used as the raw material of this composition before mixing with resin (A), the fiber length of the regenerated carbon fiber in this composition is also in this range. Is preferred.

The regenerated carbon fiber has a fiber length variation coefficient (CV) of 20% or more, preferably 22 to 50%, more preferably 25 to 40%.
By using regenerated carbon fiber having such a coefficient of variation, physical properties equivalent to or higher than those of a molded body using virgin carbon fiber can be obtained by extrusion molding or the like without using a sizing agent. Compared to a molded article using an elastic modulus, impact strength, and conductivity and using virgin carbon fibers, a molded article that does not have a significant decrease in tensile strength can be easily formed at a low cost.
The fiber length variation coefficient (CV) was calculated by the method described in the following examples.
In addition, although the said fiber length variation coefficient is a fiber length variation coefficient of the regenerated carbon fiber used as the raw material of this composition before mixing with resin (A), the fiber length variation coefficient of the regenerated carbon fiber in this composition Is preferably within this range.

  As the regenerated carbon fiber, a composite containing carbon fiber, particularly waste carbon fiber reinforced plastic, a conventionally known thermal decomposition method, chemical decomposition method, super-subcritical decomposition method, electric field oxidation method, superheated steam method, etc. Any of the fibers obtained by the above treatment may be used, but carbon fibers obtained by a pyrolysis method are preferred from the viewpoint that a molded article having desired physical properties can be obtained more easily.

The content of the regenerated carbon fiber in the composition may be appropriately selected according to the desired application, but is preferably 1 to 30% by mass with respect to 100% by mass of the resin (A) and the regenerated carbon fiber. More preferably, it is 3-25 mass%, Most preferably, it is 5-25 mass%.
When the content of the regenerated carbon fiber is in the above range, a composition having excellent processability and moldability can be obtained, and a molded article having excellent strength and rigidity and having conductivity can be easily obtained.

The regenerated carbon fiber does not contain a sizing agent (bundling agent).
When a sizing agent is used for the regenerated carbon fiber, the sizing agent is used for treating the surface of the fiber before mixing the regenerated carbon fiber obtained by treating the waste carbon fiber reinforced plastic with the resin (A). Used. For this reason, the fact that no sizing agent is contained can omit the step of treating the regenerated carbon fiber, and there is a great merit in terms of cost, equipment, etc. in preparing the present composition.

Since the sizing agent is a compound obtained by surface-treating the carbon fiber surface before mixing the resin (A) or the compatibilizer described below and the carbon fiber, the sizing agent is a compound that exists only on the carbon fiber surface, and the resin (A ) And the following compatibilizers.
Examples of the sizing agent include conventionally known carbon fiber sizing agents such as epoxy resins, urethane resins, vinyl ester resins, acrylic resins, polyimide resins, and modified products thereof.

  Note that, as described above, the regenerated carbon fiber is one in which the sizing agent attached to the virgin carbon fiber is lost, but a trace amount of the sizing agent may remain. The present invention does not exclude the use of regenerated carbon fiber in which such a very small amount of sizing agent remains, but is obtained by treating regenerated carbon fiber obtained by treating waste carbon fiber reinforced plastic with a sizing agent. This means that is not used.

<Compatibilizer>
The composition contains a compatibilizing agent that aids in compatibilization of the resin (A) and the regenerated carbon fiber in order to improve compatibility with the interface between the resin (A) and the regenerated carbon fiber. Is preferred. By using a compatibilizing agent, it is possible to easily obtain a molded body that is more excellent in strength and rigidity and that has reduced powder falling and has less burden on the human body and the environment.
The compatibilizer may be one type or two or more types.

The compatibilizing agent is not particularly limited and may be appropriately selected depending on the resin (A) to be used. Conventionally known compounds can be used. For example, a carboxy group, an acid anhydride group, an epoxy group, (meta ) Polymers containing functional groups such as acryloyl group, amino group, hydroxyl group, polyoxyalkylene group, alkoxylsilyl group, isocyanate group and oxazoline group.
Specific examples include silicone oils, higher fatty acid esters, ethylene-vinyl acetate polymers, polyvinyl alcohol, polyolefin resins modified with unsaturated carboxylic acids or derivatives thereof. Among these, a polyolefin resin modified with an unsaturated carboxylic acid or a derivative thereof is preferable, and a maleic acid-modified polyolefin is more preferable.

The content of the compatibilizing agent in the composition is preferably 0.1 to 10 parts by mass, more preferably 0.2 to 8 parts by mass with respect to a total of 100 parts by mass of the resin (A) and the regenerated carbon fiber. Especially preferably, it is 0.5-5 mass parts.
When the content of the compatibilizing agent is within the above range, a composition having excellent processability and moldability is obtained, and a molded product with less impact on the human body and the environment, which is superior in strength and rigidity and suppressed from falling off. Can be easily obtained.

<Other ingredients>
In the present composition, other components other than the resin (A), the regenerated carbon fiber and the compatibilizing agent, which have been conventionally used for molded articles, are used in a range not impairing the effects of the present invention. You may mix | blend.
Each of the other components may be used alone or in combination of two or more.

  Examples of the other components include additives commonly used in resin moldings, such as pigments, dyes, light stabilizers, UV absorbers, antibacterial substances, plasticizers, nucleating agents, heavy metal deactivators, and stabilizers. Auxiliaries, antistatic agents, conductive agents, flame retardants, heat stabilizers, antioxidants, lubricants, inorganic fillers, crosslinkable polymers and fiber reinforcing agents can be mentioned.

≪Method for producing resin composition≫
The present composition can be obtained by mixing the above-mentioned components. However, from the viewpoint of easily producing a composition capable of easily forming a molded article having desired physical properties, the following step 1 and 2 is preferred.
Step 1: Step 1 of kneading a resin-containing component, specifically, a resin, a compatibilizing agent used as necessary and the other components.
Process 2: The process of kneading the kneaded material obtained in Process 1 and the regenerated carbon fiber not containing the sizing agent

In kneading in the steps 1 and 2, a single screw extruder, a twin screw extruder, a kneader, a mixer, a two-roll mill, etc. can be used. Among these, it is sufficient to use regenerated carbon fibers that are difficult to knead. It is preferable to use a twin screw extruder from the viewpoint of kneading.
These kneaders used in steps 1 and 2 may be different in each step, but are preferably the same kneader, and the regenerated carbon fiber is fed side by side while flowing the kneaded product obtained in step 1. And kneading.

  The kneading time and temperature in each step are not particularly limited and may be appropriately selected depending on the resin (A) to be used. However, the kneading may be performed at a temperature higher than the temperature at which the resin (A) melts and lower than the temperature at which it decomposes. preferable.

≪Molded body≫
A molded body according to the present invention (hereinafter also referred to as “main molded body”) is obtained by molding the present composition, specifically, injection molding, extrusion molding, blow molding, calendering, vacuum molding, It can be obtained by molding by a known method such as compression molding or gas assist molding. Of these molding methods, injection molding and extrusion molding are preferred.

  This molded article has physical properties equivalent to or higher than those of a molded article using virgin carbon fibers, in particular, lightness, flexural modulus, impact strength, and conductivity, and is a molded article using virgin carbon fibers. Compared to applications where conventional carbon fiber reinforced plastics have been used, it is suitable for applications such as IC transport trays and home appliances, because it is a molded product that does not significantly reduce tensile strength. Can be used.

  This molded article preferably has the following physical properties relative to a similar molded article (hereinafter also referred to as “virgin molded article”) except that virgin carbon fibers are used instead of recycled carbon fibers.

  The ratio (Tr / Tn) of the tensile strength (Tr) of the molded product to the tensile strength (Tn) of the molded product measured based on ASTM-D638 is preferably 0.65 or more, more preferably It is 0.7 or more.

The present molded product was measured according to ASTM-D256, Izod impact strength, preferably 3 kJ / m ² or more, more preferably 5 kJ / m ² or more. The upper limit is not particularly limited, but is preferably 20 kJ / m ² .

The molded body has a surface resistivity measured preferably based on IEC 60093 (temperature: 23 ° C., humidity: 50% RH, apparatus: surface resistance meter [manufactured by Simco Japan Co., Ltd., ST-3]), preferably 1. × 10 ⁹ Ω / □ or less, more preferably 1 × 10 ⁶ Ω / □ or less.

  The molded body has a specific gravity measured according to JIS-K7112, preferably 0.93 to 1.30, more preferably 0.96 to 1.20.

  Next, although an Example is given and this invention is demonstrated concretely, this invention is not limited to these Examples.

[Example 1]
90% by weight PPE, 3% by weight of compatibilizer 1, 0.01% by weight of antioxidant 1 and 0.03% by weight of antioxidant 2 are added to the twin screw extruder and the cylinder temperature is set to 300 ° C. Then, 10% by mass of regenerated carbon fiber was added thereto, melted and kneaded, extruded, and then cut into a predetermined length so as to be a test piece having a shape and size used for each evaluation, thereby producing a test piece. .

[Example 2]
A test piece was produced in the same manner as in Example 1 except that 80% by mass of PPE, 5% by mass of the compatibilizer 2 and 20% by mass of the regenerated carbon fiber were used.

[Example 3 and Comparative Example 1]
A test piece was produced in the same manner as in Example 1 except that the compatibilizing agent 1 was not used and the components of the types and amounts shown in Table 1 were used.

Using the test pieces obtained in each of the examples and comparative examples, the physical properties of the obtained test pieces were evaluated based on the test methods shown in Table 1.
The measurement conditions for MFR were 300 ° C. and 2.16 kgf when PPE was used as the resin, and 230 ° C. and 2.16 kgf when modified PP was used as the resin.
Further, in the test for the deflection temperature under load, the bending stress applied to the test piece was 1.82 MPa when PPE was used as the resin, and 0.46 MPa when modified PP was used as the resin.

The materials listed in Table 1 are as follows.
・ "PPE": "Zylon 1000H" manufactured by Asahi Kasei Corporation
"Virgin carbon fiber": "T300-1000" manufactured by Toray Industries, Inc. (with sizing agent, average fiber length: 5.3 mm, fiber length variation coefficient: 17%)
"Compatibilizer 1": "Yumex 1010" manufactured by Sanyo Chemical Industries
・ "Compatibilizer 2": "Genioplast" manufactured by Asahi Kasei Wacker Silicone Co., Ltd.
・ "Antioxidant 1": "AO-60" manufactured by ADEKA Corporation
・ "Antioxidant 2": "PEP-36" manufactured by ADEKA Corporation

Of the materials listed in Table 1, “modified PP” was synthesized as follows.
JP-A-2013-189567, except that a propylene / ethylene block copolymer (ethylene-derived structural unit amount: 16% by mass) was used and the amount of raw material used was changed so that the graft amount was 0.3% by mass. Modified polypropylene (modified PP) was synthesized in the same manner as modified polypropylene-2.

Of the materials listed in Table 1, “regenerated carbon fiber” was produced as follows.
Based on the method described in Examples of JP-A-7-33904, chopped fibers of regenerated carbon fibers were obtained.
In addition, the sizing agent hardly adhered to the obtained regenerated carbon fiber, and the fiber length visually confirmed was 6 to 13 mm.
The fiber length of each of the 20 arbitrary chopped fibers obtained was measured, the average fiber length (L) and the standard deviation (σ) of the fiber length were calculated from the measurement results, and the fiber length calculated based on the following formula The coefficient of variation (CV) was 27.2%.
CV (%) = δ / L × 100

Claims (10)

Resin,
A resin composition obtained using a regenerated carbon fiber having a fiber length variation coefficient of 20% or more and containing no sizing agent.   The resin composition according to claim 1, wherein a fiber length of the regenerated carbon fiber is 1 to 15 mm.   The resin composition according to claim 1 or 2, wherein the regenerated carbon fiber is a thermal decomposition product of waste carbon fiber reinforced plastic.   The composition according to any one of claims 1 to 3, wherein the resin is at least one resin selected from a propylene resin, a polyphenylene ether resin, and an amide resin.   The composition according to any one of claims 1 to 4, comprising a compatibilizer.   The composition according to any one of claims 1 to 5, comprising 1 to 30% by mass of the regenerated carbon fiber with respect to 100% by mass in total of the resin and the regenerated carbon fiber. A method for producing a resin composition, comprising the following steps 1 and 2.
Step 1: Step 1 of kneading a component containing a resin
Process 2: The process of kneading the kneaded material obtained in Process 1 and the regenerated carbon fiber not containing the sizing agent   The manufacturing method according to claim 7, wherein the regenerated carbon fiber is a fiber obtained by pyrolyzing waste carbon fiber reinforced plastic.   The molded object of the composition of any one of Claims 1-6. The molded object of Claim 9 which satisfy | fills the following requirements (1).
Requirement (1): Request for tensile strength (Tn) measured based on ASTM-D790 of the same molded product as the molded product of claim 9 except that virgin carbon fiber was used instead of recycled carbon fiber The ratio (Tr / Tn) of tensile strength (Tr) measured based on ASTM-D790 of the molded article according to Item 9 is 0.65 or more.