JP2012251037A - Organic fiber for resin reinforcement, and fiber reinforced thermoplastic resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an organic fiber reinforced thermoplastic resin excellent in mechanical properties such as tensile strength and flexural rigidity, thermal dimensional stability, surface appearance, durability, and impact resistance of the thermoplastic resin molded article by improving adhesion and dispersibility of the fiber for resin reinforcement to/in the thermoplastic resin in a versatile and inexpensive fashion.SOLUTION: The organic fiber for resin reinforcement has a coating film including (A) a thermoplastic resin and (B) a nucleating agent imparted to a surface of the organic fiber in an amount of 1-20 wt.% with respect to the organic fiber, wherein (A)/(B), the weight ratio of (A) to (B), is in the range of 99/1-50/50, and the fiber reinforced thermoplastic resin includes (a) the organic fiber for resin reinforcement and (b) the thermoplastic resin as main components wherein the mixing weight ratio of (a) to (b) is 5/95-70/30.

Description

  The present invention relates to a resin-reinforced organic fiber, and further to a fiber-reinforced thermoplastic resin obtained by blending this resin-reinforced organic fiber in a thermoplastic resin.

  It is well known that in recent years, energy saving by reducing the weight and thickness of automobiles, home appliances and office automation equipment has become a major theme of material technology innovation in terms of reducing environmental impact. As one of the major elements to reduce the weight of these automobiles, home appliances and office automation equipment, material substitution is progressing from metal materials to lightweight organic resins. These resin materials are generally reinforced with a reinforcing material such as glass fiber in order to improve rigidity, impact resistance, thermal dimensional stability, and the like. However, the glass fiber has a higher specific gravity than the matrix resin, and in order to further reduce the weight, attention has been paid to reducing the weight of the resin composite by reinforcing the organic fiber instead. In addition, since glass fibers are hard and brittle, the glass fiber breaks into pieces during molding of the resin composite, causing problems such as insufficient aspect ratio to produce a reinforcing effect, and because molten glass remains in the blast furnace, There are also issues in recycling, such as difficulty in recycling.

  Against this background, organic fiber reinforcement for thermoplastic resins such as olefin resins and polyamide resins with high versatility and productivity has been attempted. In order to obtain higher reinforcement effects by improving mechanical properties, impact resistance, thermal dimensional stability, etc., the coating layer on the fiber surface has high interfacial adhesion between the fiber and matrix resin and is stable during resin molding. Furthermore, it is important to satisfy both the cohesion defect of the fibers, that is, the dispersibility. It is well known that, for the activation of the fiber surface and the formation of a stable film, attempts have been made to enhance the reinforcing effect of organic fibers by covering the fiber surface layer with an inexpensive, easy-to-handle and highly versatile epoxy resin. ing.

  For example, Patent Document 1 discloses a resin-reinforced aromatic polyamide short fiber in which an epoxy compound having two or more epoxy groups, a water-soluble nylon compound, and a water-soluble polyester resin are attached to an aromatic polyamide fiber. Yes. This method can improve the wear resistance, tensile strength, and flexural modulus of the composite resin, but it has insufficient adhesion to the matrix resin, and there are problems in terms of durability and impact resistance. The problem is that the processing work is complicated and expensive.

  Patent Documents 2 and 3 disclose techniques for treating a olefin-based resin molded body reinforcing aramid fiber with a treatment agent composed of an epoxy compound and an ionomer resin. In this method, the adhesion of the aramid fiber to the olefin resin is greatly improved, but since the interface bonding is carried out by ionic bonding, further improvements in durability and impact resistance are required.

  Furthermore, there is also a technique of reinforcing with a combination of inorganic fillers such as talc and clay and organic fibers as a high performance by reinforcing the matrix resin. For example, Patent Document 4 includes an olefin resin containing organic long fibers and talc. A long fiber reinforced resin composition is disclosed. According to this method, it is possible to improve the mechanical properties and impact resistance as well as excellent dispersibility of the fibers in the olefin resin, but the reinforcing effect that the interfacial adhesion between the fibers and the resin is not sufficient is limited. There is a problem.

JP-A-6-235170 Japanese Patent No. 3167514 Japanese Patent No. 3179262 JP 2009-114331 A

  The present invention has been made in view of the above prior art, and its purpose is to improve the adhesiveness and dispersibility of resin reinforcing fibers to thermoplastic resins in a general-purpose and inexpensive manner, thereby making it possible to tension thermoplastic resin molded products. An object of the present invention is to provide an organic fiber reinforced thermoplastic resin excellent in mechanical properties such as strength and bending rigidity, thermal dimensional stability, surface appearance, durability and impact resistance.

In the present invention, a coating containing (A) a thermosetting resin and (B) a crystal nucleating agent is applied to the surface of the organic fiber in an amount of 1 to 20% by weight, and (A) and (B) It is related with the organic fiber for resin reinforcement whose weight ratio is the range of (A) / (B) = 99/1-50/50.
Next, the present invention provides (b) a resin reinforcing organic fiber and (b) a thermoplastic resin as a main component, and the mixing weight ratio of (b) and (b) is 5/95 to 70/30. The present invention relates to a fiber-reinforced thermoplastic resin.

  According to the present invention, the adhesiveness and dispersibility of the resin reinforcing fiber are improved in general and inexpensively by improving the physical adhesive force with the resin by disposing the crystal nucleating agent on the fiber surface, and the thermoplasticity. An organic fiber reinforced thermoplastic resin excellent in mechanical properties such as tensile strength and bending rigidity of a resin molded product, thermal dimensional stability, surface appearance, durability, and impact resistance can be provided.

<Organic fibers for resin reinforcement>
The organic fiber for resin reinforcement of the present invention is obtained by providing a film containing (A) a thermosetting resin and (B) a crystal nucleating agent on the surface of the organic fiber.

[Organic fiber]
Examples of organic fibers include polyamide fibers (polyamide 5, polyamide 6, polyamide 66, polyamide 610, polyamide 11, polyamide 12, polyamide 612, polyamide 6/66, polyamide 6/11, and other aliphatic polyamide fibers; polyamide Aromatic polyamide fibers such as 6T, polyamide 9T, and polyamide MXD; fully aromatic polyamide fibers such as alicyclic polyamide fibers; polyparaphenylene terephthalamide, polyparaaminobenzamide, polyterephthalic acid hydrazide, polymetaphenylene iso Fibers such as phthalamide or copolymers thereof, such as copolyphenylene-3,4'-oxydiphenylene terephthalamide fiber, polyimide fibers (polyetherimide fiber, polyamideimide fiber, polyamino) Sumareimido fibers, such as bismaleimide triazine fibers), polyester fibers (polyethylene terephthalate or polybutylene terephthalate such as poly C _2-4 alkylene terephthalate, poly C _2-4 alkylene naphthalate, aromatic polyester fibers such as these copolyesters , Polyarylate fibers, liquid crystalline polyester fibers, etc.), polycarbonate fibers (bisphenol polycarbonate fibers such as bisphenol A polycarbonate, hydrogenated bisphenol polycarbonate fibers), olefin fibers [polyethylene fibers (low density polyethylene fibers, high Density polyethylene fibers), polypropylene fibers, etc.], acrylic fibers (poly (meth) acrylic acid alkyl ester fibers such as polymethyl methacrylate) Fibers, acrylonitrile fibers such as polyacrylonitrile and acrylonitrile-vinyl chloride copolymer), vinyl fibers (polyvinyl alcohol fibers, vinyl chloride fibers, vinyl acetate fibers, etc.), polyphenylene oxide fibers [polyphenylene oxide fibers, Modified polyphenylene oxide (polystyrene blended fiber, etc.)], polyphenylene sulfide fiber (polyphenylene sulfide fiber, polybiphenylene sulfide fiber, polyphenylene sulfide ketone fiber, polybiphenylene sulfide sulfone fiber, etc.), polysulfone fiber (polysulfone fiber, polyether) Sulfone fiber), polyacetal fiber (polyacetal fiber, etc.), polyether ketone fiber (polyether ketone fiber, polyether) Etc. Teruketon fibers), polybenzoxazole fibers (polyparaphenylene benzoxazole fibers, etc.), kenaf, and the like cellulose (rayon) fibers. These organic resin fibers may be used alone or in combination of two or more.
Among these fibers, polyethylene terephthalate, polyethylene naphthalate, polyarylate, rayon, nylon 66, polyvinyl alcohol, and polyphenylene sulfide are preferable from the viewpoint of versatility, mechanical properties, and heat resistance in the present invention.

[(A) Thermosetting resin]
A thermosetting resin (A) is used on the surface of the organic fiber in the present invention in order to form a stable film in the surface activation, the kneading and molding processes of the thermoplastic resin.
(A) Examples of thermosetting resins include unsaturated polyesters, vinyl ester resins, epoxy resins, resol type phenol resins, melamine resins, polyimide resins, urethane resins, copolymers thereof, and modified products. From the viewpoints of handleability, processability and thermodynamic properties, epoxy resins, urethane resins and phenol resins are preferred. Particularly preferred is an epoxy resin.

  Specifically, as the epoxy resin, a reaction of a polyepoxy compound, for example, glycerin, propylene glycol, ethylene glycol, hexanetriol, sorbitol, trimethylolpropane, polyethylene glycol, polyglycerin or the like with an epichlorohydrin. Polyglycidyl ether, vinylcyclohexene diepoxide obtained from the reaction product of phenols such as products, resorcin, catechol, hydroquinone, 1,3,5-trihydroxybenzene, bis (4-hydroxyphenyl) methane and epichlorohydrin, 3 ', 4'-epoxy-6-methylcyclohexylmethyl-3,4-epoxy-6-methylcyclohexanecarboxylate is obtained by oxidizing the unsaturated bond with peracetic acid. A polyfunctional compound selected from at least one of glycerol polyglycidyl ether, pentaerythritol polyglycidyl ether, diglycerol polyglycidyl ether, polyglycerol polyglycidyl ether, and sorbitol polyglycidyl ether, which are particularly versatile. Preferred are aliphatic aliphatic epoxy compounds.

  These epoxy resins are cured by a known crosslinking agent. Examples of the base include inorganic bases such as sodium hydroxide and ammonia, and organic bases typified by organic amines such as morpholine, piperazine, and amino alcohol.

In addition, the epoxy resin may contain a component that enhances the strength and adhesiveness of the resulting film. Examples include blocked isocyanate compounds that allow the film to crosslink.
There is no limitation in particular as a blocked isocyanate compound, For example, a blocked polyisocyanate compound is mentioned. A blocked polyisocyanate compound is an addition reaction product of a polyisocyanate compound and a blocking agent, and releases a block component by heating to produce an active polyisocyanate compound. As the polyisocyanate compound, polyisocyanate such as tolylene diisocyanate, metaphenylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, polymethylene polyphenyl isocyanate, triphenylmethane triisocyanate, or one or more of these polyisocyanates and active hydrogen atoms Examples of the compound having phenol include phenols such as phenol, thiophenol, cresol and resorcinol, aromatic secondary amines such as diphenylamine and xylidine, lactams such as phthalimide, caprolactam and valerolactam, acetoxime, and methylethylketoxime. And oximes such as cyclohexanone oxime and acidic sodium sulfite.

The urethane resin includes a compound having two hydroxyl groups in the molecule (hereinafter referred to as “diol component”) and a compound having two isocyanate groups in the molecule (hereinafter referred to as “diisocyanate component”). Can be obtained by addition polymerization in an organic solvent that does not contain water and does not have active hydrogen. The target polyurethane resin can also be obtained by reacting raw materials directly in the absence of a solvent.
Examples of the diol component include polyester diol, polyether diol, polycarbonate diol, polyether ester diol, polythioether diol, polyacetal, polysiloxane and other polyol compounds, as well as ethylene glycol, 1,4-butanediol, 1, Examples include low molecular weight glycols such as 6-hexanediol, 3-methyl-1,5-pentanediol, and diethylene glycol.
Examples of the diisocyanate component include aliphatic (alicyclic) group polyisocyanates (tetramethylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, etc.); Range isocyanate, 4,4′-diphenylmethane diisocyanate, etc.); modified products thereof (carbidiimide, uretidione, burette and isocyanurate modified products); and mixtures of two or more of these.

Furthermore, preferred examples of the phenol resin include resorcin-formalin resin derivatives and those containing an ethylene urea compound. Resorcin-formalin resin derivatives that are obtained under alkaline catalyst are preferably used, and resorcin-formalin resin is a sorption type such as a novolak-type condensate of resorcin and formalin or a chlorophenol compound in order to improve adhesion. It is preferable to contain an adhesive.
In the resorcin-formalin resin, the resorcin and formalin initial condensate was obtained under an alkali catalyst, and the molar ratio of resorcin to formalin was 1: 0.3 to 1: 5, particularly 1: 0.75 to 1. Is preferably in the range of 2.0. In the above resorcin-formalin resin, when using a novolak-type condensate of resorcin and formalin, after dissolving in an alkaline catalyst aqueous solution, formalin is added to obtain a molar ratio similar to that of resorcin and formalin initial condensate. preferable. Here, the ethylene urea compound is a compound that reacts with the opening of the ethyleneimine ring by heating to improve the adhesion between the fiber and the resin. Typical examples thereof include hexamethylene diisocyanate and tolylene diene. Examples include aromatic, aliphatic isocyanate and ethyleneimine reactive organisms such as isocyanate, diphenylmethane diisocyanate, triphenylmethane triisocyanate, and particularly aromatic ethylene urea compounds of diphenylmethane diethylene urea give good results.

[(B) Crystal nucleating agent]
In the present invention, (B) a crystal nucleating agent is blended in the surface layer of the organic fiber.
By firmly embedding the (B) crystal nucleating agent in the (A) thermosetting resin, the crystallization of the thermoplastic resin as the matrix resin proceeds in the surface film layer of the organic fiber or in its surface layer, Along with the improvement of the crystallinity of the plastic resin, the physical adhesion at the interface between the organic fiber and the thermoplastic resin, which is the matrix resin, is dramatically improved, and the mechanical properties, thermal dimensional stability and durability of the thermoplastic resin molded product are improved. And found to improve impact resistance. In addition, it has been found that the mixing of the powdery crystal nucleating agent during the kneading of the fiber-reinforced thermoplastic resin can be reduced or omitted, which is very effective from the viewpoint of industrial productivity.

(B) As the crystal nucleating agent, specifically, inorganic substances such as talc, clay, kaolin, wollastonite, organic metal salts such as metal salts of organic acids and metal salts of organic phosphates are preferably used. In view of versatility and handleability, talc and clay are more preferable.
Examples of metal salts of organic acids include organic carboxylates such as sodium acetate, sodium benzoate, sodium pt-butyl benzoate, sodium hydrogen phthalate, sodium stearate, calcium stearate, magnesium stearate, and sodium palmitate. The metal salt of an acid is mentioned. Examples of metal salts of organic phosphates include sodium bis (4-t-butylphenyl) phosphate, sodium 2,2′-methylenebis (4,6-di-t-butylphenyl) phosphate, and the like. It is done.
(B) The average particle size of the crystal nucleating agent (measured in accordance with JIS Z8825-1) is preferably 10 μm or less. When the average particle diameter exceeds 10 μm, it is difficult to adhere to the fiber surface layer, and further, it tends to be detached, and the process passability and the reinforcing effect of the molded resin tend to be insufficient. The average particle size is more preferably 5 μm or less.

[Formation of film on organic fiber surface]
In the present invention, the surface coating containing (A) a thermosetting resin on the surface of the organic fiber and (B) a crystal nucleating agent is applied to the fiber in an amount of 1 to 20% by weight. If it is less than 1% by weight, a uniform film cannot be formed on the fiber surface layer, and not only sufficient adhesion with the thermoplastic resin, which is a matrix resin, is obtained, but defects are formed at the interface between the fiber and the resin. Causes the physical properties of the resin to deteriorate. On the other hand, when it exceeds 20% by weight, not only is it expensive, but not only fiber surface treatment and scum are frequently generated during resin molding, but the productivity is remarkably lowered, and the coating tends to become brittle. Durability and impact resistance tend to decrease. As an adhesion amount, it is more preferable that 2-10 weight% is provided with respect to the fiber.

  Moreover, in the organic fiber for resin reinforcement of the present invention, the mixing weight ratio of (A) thermosetting resin and (B) crystal nucleating agent is in the range of (A) / (B) = 99/1 to 50/50. It is. (B) When the mixing weight ratio of the crystal nucleating agent is lower than 1, the effect of promoting crystallization into the thermoplastic resin as the matrix resin is insufficient, and the mechanical properties, durability and impact resistance of the molding resin are lowered. . On the other hand, when the mixing weight ratio of (B) crystal nucleating agent exceeds 50, the coating on the surface of the organic fiber becomes brittle and the crystal nucleating agent cannot be held on the fiber surface layer, and the durability and impact resistance of the molded resin are reduced There is a tendency to end up. The fiber reinforcement effect in which the mixing weight ratio of (A) thermosetting resin and (B) crystal nucleating agent in the present invention is in the range of (A) / (B) = 99/5 to 60/40. Is more preferable.

  Moreover, the organic fiber for resin reinforcement of the present invention comprises (A) a thermosetting resin and (B) a crystal nucleating agent in an aqueous dispersion or neat state as it is in the state of neat as it is or a dipping process. It is obtained by applying and heat-treating by a known method such as spraying or oiling roller. The heat treatment temperature is not particularly limited as long as the physical properties of the organic fiber are not impaired, but heat setting and aging are performed at a temperature of 250 ° C. or lower and 20 ° C. or lower than the melting point of the organic fiber.

  In addition, although the process of the (A)-(B) component to an organic fiber is normally performed in the state where an organic fiber is a multifilament (or tow | toe), it is cut into appropriate length after that according to a use. And used for resin reinforcement.

<Fiber-reinforced thermoplastic resin>
The fiber-reinforced thermoplastic resin of the present invention is obtained by blending the above-described organic fibers for resin reinforcement with a thermoplastic resin as a matrix component.

〔Thermoplastic resin〕
The thermoplastic resin used in the present invention is not particularly limited as long as a reinforcing effect by fibers can be obtained, but among them, it is selected from the group of polyolefin, polyacrylonitrile, polybutadiene, polyvinyl chloride, polyacetal, polyester and polyamide. Any one is preferable.

  More specifically, for example, when the thermoplastic resin is polyester, it is made of polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polybutylene naphthalate (PBN) or a copolymer thereof. It is preferable that When the thermoplastic resin is polyamide, it is preferably made of nylon 6, nylon 66, nylon 610, nylon 11 or nylon 12, or a copolymer thereof. And when a thermoplastic resin is polyolefin, it is preferable that it consists of polyethylene, a polypropylene, a polystyrene, or those copolymers. More preferred preferred polyolefin resins include polypropylene (PP), high density polyethylene (HDPE), linear low density polyethylene (LLDPE), low density polyethylene (LDPE), ultra high molecular weight polyethylene (PE-UHMW) or butene-1. , Α-olefins such as hexene-1, octene-1, 4-methylpentene-1, copolymers thereof, atactic polystyrene (APS), isotactic polystyrene (IPS), syndiotactic polystyrene (SPS), Examples thereof include polyolefin resins such as copolymers, modified polyolefin resins modified with unsaturated carboxylic acids and derivatives thereof, or blends of two or more thereof. Furthermore, it is preferable in view of the balance between physical properties and price that the main component is a polyolefin composed of polyethylene, polypropylene, polystyrene, or a copolymer thereof.

  In addition, the thermoplastic resin used in the present invention includes a dispersant, a lubricant, a flame retardant, an antioxidant, an antistatic agent, a light stabilizer, an ultraviolet absorber, carbon black, a crystallization accelerator (increase depending on the application). Needless to say, a nucleating agent), a plasticizer, a coloring agent such as a pigment or a dye can be contained. Furthermore, in the present invention, an appropriate amount of an inorganic filler such as talc, clay, mica, wollastonite and the like may be added to the thermoplastic resin as necessary.

  In the present invention, the mixing weight ratio of (b) resin reinforcing organic fiber and (b) thermoplastic resin is 5/95 to 70/30. (A) When the mixing weight ratio of the organic fiber for resin reinforcement to the (B) thermoplastic resin is less than 5, the reinforcing effect of the thermoplastic resin cannot be obtained because the amount of fiber to be reinforced is small. On the other hand, when the mixing weight ratio of (b) resin reinforcing organic fiber to (b) thermoplastic resin is more than 70, (b) fiber aggregation and entanglement are likely to occur frequently during kneading and molding of thermoplastic resin. Cause a significant decrease in In the present invention, the mixing weight ratio of (b) the resin reinforcing organic fiber and (b) the thermoplastic resin is more preferably 10/90 to 50/50 because an excellent fiber reinforcing effect can be obtained.

  The fiber-reinforced thermoplastic resin of the present invention is obtained by a known method, for example, long fiber pultrusion, melt injection molding of pellets kneaded with short fibers, press molding using short fibers or woven or knitted fabric, blow molding, or the like. A molded product can be obtained. Moreover, the obtained resin molded product can be suitably used as a resin molded part for vehicles, electrical / electronic devices, machines, and construction / civil engineering.

EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention in detail, this invention is not limited by this. Various characteristics were measured by the following methods.
(1) Tensile strength and elastic modulus of resin molded product Based on the ASTM-D-638 method, measurement was performed at a sample thickness of 3.2 mm, a test speed of 10 mm / min, and 23 ° C.
(2) Flexural Modulus of Resin Molded Product According to ASTM-D-790 method, measurement was performed at a sample thickness of 3.2 mm, a test speed of 2 mm / min, a fulcrum distance of 50 mm, and 23 ° C.
(3) IZOD impact strength of resin molded products (notched)
Based on the ASTM-D-256 method, the sample thickness was measured at 3.2 mm and 23 ° C.
(4) Deflection temperature under load of resin molded product Based on the ASTM-D-648 method, it was measured under a load of 18.5 kgf / cm2.
(5) Surface appearance of resin molded product The surface of the flat plate of the resin molded product was visually observed. ○ when the fiber dispersion is good and the flat plate surface is smooth, △ when a few fiber bundles where the fibers are not opened are seen, △ when many fiber bundles where the fibers are not opened are seen And evaluated in three stages.

Examples 1-3, Comparative Examples 1-5
(A) As an epoxy compound (epoxy resin) which is a thermosetting resin, sorbitol polyglycidyl ether (Denacol EX-614B manufactured by Nagase ChemteX Corporation), (B) talc (K-1 manufactured by Nippon Talc Co., Ltd.) as a crystal nucleating agent After mixing with a weight ratio shown in Table 1 and then diluting with softened water, 1/30 amount of sodium hydroxide was added to the total amount of epoxy to prepare a mixed water dispersion. Using this mixed water dispersion, a dip was applied to polyethylene naphthalate fiber (Teonex manufactured by Teijin Fibers Limited; BHT 1670T250 Q904N, total fineness 1,670 dtx, filament number 250) at 150 ° C. for 2 minutes at 240 ° C. A constant length heat treatment for 1 minute was performed to obtain an epoxy-treated polyethylene naphthalate fiber. The adhesion amount of the epoxy / talc to the fiber was adjusted by adjusting the concentration of the mixed water dispersion, and adjusted to the adhesion amount shown in Table 1. The obtained fiber was cut into a 3 mm length with a guillotine cutter, and then shown in Table 1 using a polypropylene resin chip [Prime Polymer Prime Polypro J106] and a twin screw extrusion molding machine (KZW31-42MG-01R manufactured by Technobel). After kneading and pelletizing at a temperature of 200 ° C. with the amount of fibers added, injection molding (Toyo Machine Metal Co., Ltd. PLASTAR Si-80IV) was performed at 200 ° C. to obtain a predetermined fiber-reinforced resin molded product. The evaluation results are collectively shown in Table 1.

  The fiber-reinforced thermoplastic resin molded article obtained by the present invention can be suitably used as a resin molded part for vehicles, electrical / electronic devices, machines, and construction / civil engineering.

Claims (11)

On the surface of the organic fiber, a film containing (A) a thermosetting resin and (B) a crystal nucleating agent is applied to the organic fiber in an amount of 1 to 20% by weight, and the weight ratio of (A) and (B). Is an organic fiber for resin reinforcement, in the range of (A) / (B) = 99/1 to 50/50.
Fiber reinforced thermoplastic resin.   The organic fiber for resin reinforcement according to claim 1, wherein the organic fiber is at least one selected from the group consisting of polyethylene terephthalate, polyethylene naphthalate, polyarylate, rayon, nylon 66, polyvinyl alcohol, and polyphenylene sulfide. (A) The organic fiber for resin reinforcement according to claim 1 or 2, wherein the thermosetting resin is at least one selected from the group of epoxy resins, urethane resins, and phenol resins.
Reinforced thermoplastic resin.   (B) The crystal nucleating agent is an inorganic substance selected from talc, clay, kaolin and wollastonite, or an organic metal salt selected from a metal salt of an organic acid or a metal salt of an organic phosphate. The organic fiber for resin reinforcement in any one of -3.   The (a) organic fiber for resin reinforcement according to any one of claims 1 to 4 and (b) a thermoplastic resin as a main component, and a mixing weight ratio of (a) and (b) is 5/95 to 70 / A fiber-reinforced thermoplastic resin characterized by being 30.   (B) The fiber-reinforced thermoplastic resin according to claim 5, wherein the thermoplastic resin is at least one selected from the group consisting of polyolefin, polyacrylonitrile, polybutadiene, polyvinyl chloride, polystyrene, polyacetal, polyester, and polyamide.   The fiber-reinforced thermoplastic resin according to claim 6, wherein the polyolefin is made of polyethylene, polypropylene, or a copolymer thereof.   The fiber-reinforced thermoplastic resin according to claim 6, wherein the polyester is made of polyethylene terephthalate, polybutylene terephthalate, polybutylene naphthalate or a copolymer thereof.   The fiber-reinforced thermoplastic resin according to claim 6, wherein the polyamide is made of nylon 6, nylon 66, nylon 610, nylon 11 or nylon 12, or a copolymer thereof.   A resin molded body obtained by melting and molding the fiber-reinforced thermoplastic resin according to any one of claims 5 to 9.   The resin molded body according to claim 10, which is a resin molded part for a vehicle, an electric / electronic device, a machine, or a building / civil engineering.