JP2013001759A - Resin reinforcing organic fiber and fiber reinforced thermoplastic resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fiber reinforced thermoplastic resin excellent in mechanical properties such as tensile strength and flexural rigidity, thermal dimensional stability, surface external appearance, durability, and impact resistance of thermoplastic molded articles by versatilely and inexpensively improving the adhesion and the dispersibility of a resin reinforcing fiber.SOLUTION: The resin reinforcing organic fiber is obtained by imparting 1-20 wt.% in terms of solid content a treating agent including (A) a polyfunctional epoxy compound having at least three or more epoxy groups in the molecule, (B) a polyurethane resin emulsion, and (C) a rubber latex to the surface of an organic fiber and (A)/(B) (solid content weight ratio) is in the range of 1/99 to 30/70 and {[(A)+(B)]/(C)} (solid content weight ratio) is in the range of 80/20 to 95/5. The fiber reinforced thermoplastic resin has (a) the resin reinforcing organic fiber and (b) a thermoplastic resin as the main components at a mixing weight ratio of (a) to (b) of 1/99 to 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. In addition, glass fiber is hard and brittle, so the glass fiber breaks into pieces during molding of the resin composite, and there is a problem that a sufficient aspect ratio is not obtained to express the reinforcing effect. There are also issues in recycling, such as difficulty in recycling.

  Against this background, reinforcement with organic fibers for thermoplastic resins such as olefin resins and polyamide resins with high versatility and high 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. In this method, the wear resistance, tensile strength, and flexural modulus of the composite resin can be improved, but the adhesive strength with the resin is insufficient, 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 polyolefin resin molded body reinforcing aramid fiber with a treatment agent composed of an epoxy compound and an ionomer resin. In this method, the adhesive strength of the aramid fiber to the polyolefin-based resin is greatly improved, but since the interfacial adhesion is carried out by ionic bonding, further improvement in terms of durability and impact resistance is necessary.

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

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

The present invention provides a treatment agent comprising (A) a polyfunctional epoxy compound having at least three epoxy groups per molecule, (B) a polyurethane resin emulsion, and (C) a rubber latex on the surface of an organic fiber. 1 to 20% by weight in terms of solid content, and (A) / (B) (solid content weight ratio) = 1/99 to 30/70, << [(A) + (B)] / (C ) >> (weight ratio of solid content) = 80/20 to 95/5.
Next, the present invention is based on (b) a resin reinforcing organic fiber and (b) a thermoplastic resin, and the mixing weight ratio of (b) and (b) is 1/99 to 70/30. The present invention relates to a fiber-reinforced thermoplastic resin.

  According to the present invention, by improving the adhesiveness and dispersibility of organic fibers for resin reinforcement in a general and inexpensive manner, mechanical properties such as tensile strength and bending rigidity of the obtained thermoplastic resin molded product, thermal dimensional stability, A fiber-reinforced thermoplastic resin excellent in surface appearance, durability, and impact resistance can be provided.

<Organic fibers for resin reinforcement>
The organic fiber for resin reinforcement of the present invention comprises (A) a polyfunctional epoxy compound having at least three epoxy groups per molecule, (B) a polyurethane resin emulsion, and (C) rubber on the surface of the organic fiber. A treatment agent containing latex is added.

[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, aliphatic hydroxycarboxylic acids such as glycolic acid, lactic acid, 3-hydroxybutyric acid, 6-hydroxycaproic acid, and aliphatic lactones such as glycolide, lactide, butyrolactone, caprolactone, etc. Fats such as ethylene glycol, propylene glycol, butanediol, pentanediol, hexanediol, neopentyl glycol, etc., polymerized from a single monomer Aliphatic diols or aliphatic polyalkylene ether glycols such as diethylene glycol, triethylene glycol, ethylpropyl ether glycol, bishydroxyethylpropane, bishydroxypropylbutane, polyethylene glycol, polypropylene glycol, polybutylene ether, and the like, succinic acid, adipine It consists of aliphatic dicarboxylic acids such as acid, suberic acid, azelaic acid, sebacic acid and decanedicarboxylic acid, that is, aliphatic polyester consisting of diol (glycol) monomer and dicarboxylic acid monomer), polycarbonate fiber (bisphenol A) Bisphenol-type polycarbonate fibers such as polycarbonate, hydrogenated bisphenol-type polycarbonate fibers), olefin fibers [poly Tylene fiber (low density polyethylene fiber, high density polyethylene fiber, etc.), polypropylene fiber, etc.], acrylic fiber (poly (meth) acrylic acid alkyl ester fiber such as polymethyl methacrylate, polyacrylonitrile, acrylonitrile-vinyl chloride copolymer) Acrylonitrile fiber), vinyl fiber (polyvinyl alcohol fiber, vinyl chloride fiber, vinyl acetate fiber, etc.), polyphenylene oxide fiber (polyphenylene oxide fiber, modified polyphenylene oxide (blend with polystyrene, etc.) fiber, etc. ], Polyphenylene sulfide fiber (polyphenylene sulfide fiber, polybiphenylene sulfide fiber, polyphenylene sulfide ketone fiber, polybiphenylene sulfide sulfone fiber, etc.), poly Sulfone fibers (polysulfone fibers, polyethersulfone fibers, etc.), polyacetal fibers (polyacetal fibers, etc.), polyether ketone fibers (polyether ketone fibers, polyether ether ketone fibers, etc.), polybenzoxazole fibers (polyparaffin fibers, etc.) Phenylene benzoxazole-based fibers), kenaf, cellulose (rayon) -based fibers, and the like. 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) polyfunctional epoxy compound]
In the present invention, among the treatment agents applied to the surface of the organic fiber, as the (A) polyfunctional epoxy compound, a polyfunctional epoxy compound having at least three epoxy groups per molecule is used. In order to form a stable film even in the kneading and molding process of thermoplastic resin on the fiber surface layer, a strong film with a high crosslinking density is formed on the fiber surface layer, and the surface of the fiber is an epoxy group or a hydroxyl group with an epoxy group opened. The surface can be activated with a polar functional group. Examples of the polyfunctional epoxy compound (A) include polyepoxy compounds such as glycerin, propylene glycol, ethylene glycol, hexanetriol, sorbitol, trimethylolpropane, polyethylene glycol, polyglycerin and other aliphatic polyhydric alcohols and epichlorohydrin. Reaction products, resorcinol, catechol, hydroquinone, 1,3,5-trihydroxybenzene, polyglycidyl ether obtained from the reaction product of phenols such as bis (4-hydroxyphenyl) methane and epichlorohydrin, vinylcyclohexene di It is obtained by oxidizing the unsaturated bond with peracetic acid such as epoxide, 3 ′, 4′-epoxy-6-methylcyclohexylmethyl-3,4-epoxy-6-methylcyclohexanecarboxylate, etc. In the present invention, at least one of glycerol polyglycidyl ether, pentaerythritol polyglycidyl ether, diglycerol polyglycidyl ether, polyglycerol polyglycidyl ether, and sorbitol polyglycidyl ether, which are particularly versatile, is used in the present invention. A polyfunctional aliphatic epoxy compound selected from is preferably used.

[(B) Polyurethane resin emulsion]
In the present invention, it is important to use (B) polyurethane resin emulsion.
(B) The polyurethane resin constituting the polyurethane resin-based emulsion can be produced by reacting a known method, for example, an organic polyisocyanate, a polymer polyol, and, if necessary, a chain extender by a one-shot method or a multistage method.

  Organic polyisocyanates include aliphatic (alicyclic) group polyisocyanates (tetramethylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, 4,4′-dicyclohexylmethane diisocyanate, etc.); aromatic polyisocyanates (xylylene diisocyanate, tolylene diene) Isocyanates, 4,4′-diphenylmethane diisocyanate, etc.); modified products thereof (carbidiimide, uretidione, burette and isocyanurate modified products); and mixtures of two or more of these.

Examples of the polymer polyol include polyether polyol and polyester polyol.
Of these, low molecular weight polyols such as polyhydric alcohols (ethylene glycol, propylene glycol, 1,4-butanediol, glycerin, trimethylolpropane, hexanetriol, N-methyldiethanolamine, etc.); polyhydric phenol (bisphenol) A, bisphenol S, etc.)] and amine oxides (polyamines, alkanolamines) alkylene oxides (C2-C4 alkylene oxides such as ethylene oxide, propylene oxide, butylene oxide) adducts and ring-opening polymers of the alkylene oxides (Polyethylene glycol, polypropylene glycol, polytetramethylene glycol, etc.).
Polyester polyols include polycarboxylic acids [aliphatic polycarboxylic acids (such as adipic acid, maleic acid, dimerized linoleic acid) and / or aromatic polycarboxylic acids (such as terephthalic acid, isophthalic acid, and sodium sulfoisophthalic acid). Examples thereof include polyester polyol, polycaprolactone polyol, and polycarbonate polyol obtained by a reaction with a low molecular polyol or a polyether polyol.
The average molecular weight of the polymer polyol is usually 500 to 4,000, preferably 1,000 to 3,000.

  The chain extender used as necessary includes low molecular diols [ethylene glycol, di-, tri- and tetraethylene glycol, propylene glycol, dipropylene glycol, 1,3- and 1,4-butanediol, 1,6- Hexanediol, neopentyl glycol, dimethylolpropionic acid, glyceric acid, alkylene oxide low molar adducts of bisphenols (molecular weight less than 500), etc .; alkanolamines (ethanolamine, propanolamine, diethanolamine, dipropanolamine, etc.) Aliphatic diamines (ethylenediamine, hexamethylenediamine, etc.); alicyclic diamines (isophoronediamine, etc.); araliphatic diamines (xylylenediamine, etc.); aromatic diamines (diaminodiphenylmethane, etc.) ); Hydrazine; piperazine; compound having at least two active hydrogen atoms in a molecule reactive with isocyanate groups and water.

  The polyurethane resin emulsion (B) used in the present invention is, for example, a method of obtaining an emulsion by mixing an aqueous solution containing a surfactant as necessary with an organic solvent solution or an organic solvent dispersion of the polyurethane resin as described above. The solid content concentration is usually about 20 to 60% by weight.

[(C) rubber latex]
Furthermore, in the present invention, it is important to use (C) rubber latex.
(C) A rubber latex is a compound having a glass transition point of -10 ° C. or less at room temperature and a rubber elasticity at room temperature, in which a solid content is dispersed in water at a concentration of 5 to 90 wt%. Refers to an emulsion. Generally called latex, examples include natural rubber latex, styrene-butadiene copolymer latex, vinylpyridine-styrene-butadiene terpolymer latex (hereinafter referred to as Vp latex), nitrile rubber latex, chlorobrene rubber latex, ethylene There are propylene and diene monomer latexes, and these can be used alone or in combination.
This (C) rubber latex preferably has an elongation (measured according to JIS K-6251) of the polymer constituting the latex of 100% or more. When the elongation is less than 100%, the stress distribution between the organic fiber and the thermoplastic resin as the matrix resin is not sufficient in impact resistance, and good performance cannot be obtained.

[Granting of treatment agent on organic fiber surface]
The treating agent on the surface of the organic fiber in the present invention has a function of covering the fiber surface and developing adhesiveness to both the fiber and the thermoplastic resin. In addition, when the adhesiveness is good, the tensile strength and bending rigidity of the fiber / thermoplastic resin composite are improved due to the physical properties of the fiber. However, since the fiber breakage occurs early due to the deformation of the fiber reinforced thermoplastic resin (composite) reinforced with organic fibers, the impact resistance tends to be lowered.
By using the treatment agent of the present invention, both of these can be achieved and the physical properties can be controlled according to the purpose.
That is, the (A) polyfunctional epoxy compound on the surface of the organic fiber provides adhesion to the resulting organic fiber for resin reinforcement.
In addition, (A) polyfunctional epoxy compounds are not only bonded by forming covalent bonds with fibers having active hydrogen such as polyamide fibers, but also a wide range of organic fibers such as polyimide fibers, polyester fibers and acrylic fibers. Adhesion is provided by the high affinity with the partial charge bias structure.

The (B) polyurethane resin emulsion applied simultaneously has high compatibility and adhesiveness by the same mechanism.
(B) The polyurethane resin emulsion is an organic material composed of a hard segment caused by an organic polyisocyanate and a soft segment caused by a polymer polyol, and can exhibit appropriate hardness and elongation as a material. In addition, it is possible to copolymerize components having various structures, and it is possible to realize compatibility and adhesion to many thermoplastic resins.
As a result, it has adhesiveness to both organic fibers and thermoplastic resins, and absorbs the strain energy generated at the interface in the composite of organic fibers and thermoplastic resins, resulting in tensile strength, bending rigidity and durability, and impact resistance. It is possible to achieve compatibility.

  Furthermore, the rubber latex (C) in the present invention aims to further improve durability and impact resistance. (C) Since the rubber latex has a high elongation property at room temperature and at the same time has a high tan δ, it is possible to release the energy applied as an external force as thermal energy. It was possible to further improve the durability and impact resistance by dispersing such components in the coating film.

  Thus, the organic fiber for resin reinforcement of the present invention has (A) a polyfunctional epoxy compound, (B) a polyurethane resin emulsion, and (C) a treatment agent containing a rubber latex on the surface of the organic fiber. It is added in an amount of 1 to 20% by weight, preferably 3 to 20% by weight in terms of solid content. If the amount of treatment agent attached is less than the above range, a uniform film cannot be formed on the fiber surface layer, and sufficient adhesion with the resin cannot be obtained, and defects will be formed at the interface between the fiber and the resin. Causes deterioration of physical properties. On the other hand, when the above range is exceeded, poor dispersion due to sticking of fibers is caused, and sufficient properties as a composite cannot be brought about.

  In the treatment agent containing the components (A) to (C) in the present invention, the ratio of the (A) polyfunctional epoxy compound and the (B) polyurethane resin emulsion is (A) / (B) [solid content weight ratio. ] = 1/99 to 30/70, preferably 5/95 to 30/70, more preferably 5/95 to 20/80. (A) If the ratio of the polyfunctional epoxy compound is less than the above range, the adhesion to the fiber surface is insufficient, and in particular, sufficient properties cannot be obtained in terms of tensile strength and bending rigidity. On the other hand, when the amount is larger than the above range, the hardness of the organic fiber becomes too hard and the processing becomes difficult, and the durability and impact resistance are reduced.

  In the treatment agent containing (A) a polyfunctional epoxy compound, (B) polyurethane resin emulsion, and (C) rubber latex, (<< [(A) + (B)] / (C) >> (solid content (Weight ratio) is 50/50 to 99/1, preferably 70/30 to 98/2, more preferably 80/20 to 95/5. (C) When the ratio of the rubber latex is less than the above range, The effect of improving durability and impact resistance is insufficient. On the other hand, if it exceeds the above range, (B) the compatibility between polyurethane resin emulsion and thermoplastic resin is impaired, and the performance in terms of tensile strength and bending rigidity Decrease is observed.

  Application of the treating agent to the organic fiber is performed by applying a treating agent containing (A) a polyfunctional epoxy compound, (B) a polyurethane resin emulsion, and (C) a rubber latex to the organic fiber. 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.

  Application of the treatment agent containing the components (A) to (C) to the organic fiber is usually performed in a state where the organic fiber is multifilament (or tow). It is cut and used for resin reinforcement.

<Fiber-reinforced thermoplastic resin>
The fiber-reinforced thermoplastic resin of the present invention is obtained by blending the above-mentioned (a) resin reinforcing organic fibers with the (b) 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, polyolefin, polyacrylonitrile, polybutadiene, polyvinyl chloride, polystyrene resin, polyacetal, polyester, polyamide It is preferably any one selected from the group.

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, 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. , Polyolefin resins such as α-olefins such as hexene-1, octene-1, 4-methylpentene-1, copolymers thereof, modified polyolefin resins modified with unsaturated carboxylic acids or derivatives thereof, or the like Two or more types of blends can be exemplified. Furthermore, it is preferable from the viewpoint of the balance between physical properties and price that the main component is polyolefin made of polyethylene, polypropylene, or a copolymer thereof.
Examples of polystyrene resins include atactic polystyrene (APS), isotactic polystyrene (IPS), syndiotactic polystyrene (SPS), copolymers thereof, and blends of two or more 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) the resin reinforcing organic fiber and (b) the thermoplastic resin is 1/99 to 70/30. Preferably it is 3 / 97-50 / 50. When the mixing weight ratio of the organic fiber to the thermoplastic resin is less than the above range, the amount of fibers to be reinforced is small, so that the thermoplastic reinforcing effect cannot be obtained. On the other hand, when the mixing weight ratio of the organic fiber to the thermoplastic resin exceeds the above range, fiber aggregation and entanglement tend to occur frequently during the kneading and molding of the thermoplastic resin, and the physical properties of the molded resin are significantly lowered.

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.
What is the melting temperature during molding? Usually, it is not lower than the melting point of the thermoplastic resin (b), which is the matrix resin, and not higher than the melting point of the reinforcing fiber, preferably about + 5 ° C. of the matrix resin to about −10 ° C. of the reinforcing fiber.

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 at 18.5 kgf / cm ² load.
(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 1-7
(A) Sorbitol polyglycidyl ether (Denacol EX-614B manufactured by Nagase ChemteX Corp.) as a polyfunctional epoxy compound, (B) Polymer of yellowed isocyanate and polyester polyol as a polyurethane resin emulsion (Daiichi Kogyo Seiyaku super) Flex 700, aqueous emulsion with a solid concentration of 25% by weight), (C) SBR latex as a rubber latex (Nippol NX LX112 made by Nippon Zeon Co., Ltd., solid content concentration 40% by weight, glass transition temperature of the polymer constituting the latex: −47 ° C., The elongation of the same polymer at 20 ° C. was 400%).
These were mixed at a weight ratio shown in Table 1, and then diluted with softened water, and then a solution in which 1/30 amount of sodium hydroxide was added to the total amount of epoxy was prepared, and then polyethylene naphthalate fiber (Teijin Fiber ( Teonex Co., Ltd .; BHT 1670T250 Q904N, total fineness 1,670 dtx, filament number 250) and dip-treated, and subjected to constant length heat treatment at 150 ° C. for 2 minutes and 240 ° C. for 1 minute to obtain an epoxy-treated polyethylene naphthalate fiber . In addition, the epoxy adhesion amount to the fiber was adjusted by adjusting the concentration of the aqueous epoxy solution, and adjusted to the epoxy 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 organic fiber for resin reinforcement of the present invention and the fiber reinforced thermoplastic resin obtained by using the same can be suitably used for resin molded parts for vehicles, electric machines / electronic devices, machines, and construction / civil engineering.

Claims (12)

  On the surface of the organic fiber, a treatment agent containing (A) a polyfunctional epoxy compound having at least three epoxy groups per molecule, (B) a polyurethane resin emulsion, and (C) a rubber latex is converted into a solid content. 1 to 20% by weight, and (A) / (B) (solid content weight ratio) = 1/99 to 30/70, << [(A) + (B)] / (C) >> (solid Organic weight fiber for resin reinforcement in a range of 80/20 to 95/5.   An organic fiber for resin reinforcement, 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 polyfunctional epoxy compound is at least one selected from the group of glycerol polyglycidyl ether, pentaerythritol polyglycidyl ether, diglycerol polyglycidyl ether, polyglycerol polyglycidyl ether, and sorbitol polyglycidyl ether, The organic fiber for resin reinforcement according to claim 1 or 2.   (B) The organic fiber for resin reinforcement according to any one of claims 1 to 3, wherein the polyurethane resin emulsion is a polymer of polyisocyanate and polymer polyol.   (C) The rubber latex has a glass transition temperature of the polymer constituting the latex of −10 ° C. or lower, and the elongation at 20 ° C. (measured in accordance with JIS K-6251) of the polymer is 100% or higher. The organic fiber for resin reinforcement according to any one of claims 1 to 4.   The (a) resin reinforcing organic fiber according to any one of claims 1 to 5 and (b) a thermoplastic resin as a main component, wherein the mixing weight ratio of (a) and (b) is 1/99 to 70 /. A fiber-reinforced thermoplastic resin characterized by being 30.   (B) The fiber-reinforced thermoplastic resin according to claim 6, wherein the thermoplastic resin is at least one selected from the group consisting of polyolefin, polyacrylonitrile, polybutadiene, polyvinyl chloride, polystyrene resin, polyacetal, polyester, and polyamide. .   The organic fiber-reinforced thermoplastic resin according to claim 7, wherein the polyolefin is made of polyethylene, polypropylene, or a copolymer thereof.   Polyester is an aromatic polyester made of polyethylene terephthalate, polybutylene terephthalate or polybutylene naphthalate or a copolymer thereof, or an aliphatic polyester made of polylactic acid, polybutylene succinate, polyethylene succinate or a copolymer thereof. The fiber-reinforced thermoplastic resin according to claim 7.   8. The organic fiber-reinforced thermoplastic resin according to claim 7, 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 6 to 10.   The resin molded body according to claim 11, which is a resin molded part for a vehicle, an electric / electronic device, a machine, or a building / civil engineering.