JP2012116917A - Fiber-reinforced resin pellet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fiber-reinforced resin pellet excellent in mechanical properties, flowability, etc. and excellent especially in flexural modulus and productivity.SOLUTION: The fiber-reinforced resin pellet comprises a fiber-reinforced resin composition obtained by blending a thermoplastic resin (A) with a short-fiber filler (B1) having a weight average fiber length of 0.1-0.5 mm and a long-fiber filler (B2) having a fiber length of 3-30 mm, wherein all of the long-fiber filler (B2) is arranged in the same length as the pellet.

Description

  The present invention relates to a fiber reinforced resin pellet excellent in mechanical properties, fluidity, etc., particularly excellent in flexural modulus and productivity, despite being highly filled with a fibrous filler.

  As a means for improving the mechanical properties of a thermoplastic resin, it is generally known to blend a fibrous filler such as glass fiber or carbon fiber. As a general blending technique, a technique in which a fiber reinforced resin composition is obtained by melt-kneading a thermoplastic resin and chopped strands (short fibers) of fibers in an extruder is used.

  However, in recent years, the demand for higher performance of plastics has been advanced, and rigidity equivalent to that of metals has been demanded. In order to achieve rigidity equivalent to that of metal, it is necessary to maintain high fiber length and keep the fiber length long, but in the method of melt kneading in a general extruder, the fiber breaks due to shear during melt kneading. In addition, there are many problems such as deterioration of the resin due to shear heat generation caused by a large amount of fibrous filler, and there is a limit to improving the performance of the method of melt-kneading the thermoplastic resin and the fibrous filler with an extruder. It was.

  On the other hand, a technique has been proposed in which the fiber length is controlled by using a combination of fine glass fiber and chopped strand glass fiber as a raw material before melt kneading to improve performance. However, this is a technique using fine fibers, which is effective for fluidity and surface appearance, but does not improve the mechanical properties.

  In addition, as a method for producing a thermoplastic resin composition reinforced with long fibers without causing fiber breakage, a pull-trusion method or fiber bundle in which a fiber bundle immersed in a molten resin is mechanically impregnated and pulled out from a die is used. There has been proposed an electric wire covering method in which a thermoplastic resin is extruded and coated through a coating die for electric wire covering to obtain an electric wire strand. (Refer to Patent Documents 2 and 3) However, since both methods are methods of covering a continuous long fiber bundle with a thermoplastic resin while pulling out from a die, it is possible to keep the fibers in the pellet for a long time. The bundle is easy to protrude from the thermoplastic resin coating, and there is a limit to the amount of continuous long fiber bundles that can be coated.

  As described above, in the fiber reinforced resin pellets, various ideas have been made on the raw material surface and the manufacturing process, but the metal equivalent rigidity is obtained, the productivity is excellent, and the high mechanical characteristics are obtained. Did not exist.

Japanese Patent Laid-Open No. 9-12858 (Claim 1) JP-A-4-153007 (Claim 1) JP 2004-14990 A (Claims 1 and 5)

  An object of the present invention is to provide a fiber-reinforced resin pellet that solves the above-described problems and can improve the filling of the fibrous filler and has improved excellent mechanical properties, fluidity, appearance, and productivity. It is.

The present invention has been obtained as a result of intensive studies by the present inventors in order to solve the above problems.
(1) A thermoplastic resin (A), a short fibrous filler (B1) having a weight average fiber length of 0.1 to 0.5 mm, and a long fibrous filler (B2) having a fiber length of 3 to 30 mm are blended. A fiber reinforced resin pellet made of a fiber reinforced resin composition, wherein all of the long fibrous fillers (B2) are arranged in the same length as the pellet.
(2) 20 to 80 parts by weight of thermoplastic resin (A), 5 to 40 parts by weight of short fiber filler (B1) and 15 to 15 parts of long fiber filler (B2), based on 100 parts by weight of the fiber reinforced resin composition The fiber-reinforced resin pellet according to (1), comprising a fiber-reinforced resin composition containing 40 parts by weight.
(3) The long fiber filler (B2) has a blending amount of 100% by weight of the total amount of the short fiber filler (B1) and the long fiber filler (B2). The blending amount is 20 to 80% by weight, the total amount of the thermoplastic resin (A) and the short fibrous filler (B1) is 100% by weight, and the blending amount of the short fibrous filler (B1) is 60% by weight. The fiber-reinforced resin pellet according to (1) or (2), wherein:
(4) The fiber reinforced resin pellet according to any one of (1) to (3), wherein the short fibrous filler (B1) and / or the long fibrous filler (B2) is carbon fiber.
(5) A short fiber reinforced resin composition in which the long fibrous filler (B2) is arranged at the center of the cross section of the fiber reinforced resin pellet and the thermoplastic resin (A) and the short fibrous filler (B1) are blended is used. The fiber-reinforced resin pellet according to any one of (1) to (4), wherein the fiber-reinforced resin pellet is disposed in a surrounding outer layer portion.
(6) A molded product formed by molding the fiber-reinforced resin pellet according to any one of (1) to (5).
(7) The molded article according to (6), wherein the bending elastic modulus (M1) in the flow direction is 20 GPa or more.
(8) The ratio (M2 / M1) of the bending elastic modulus (M1) in the flow direction to the bending elastic modulus (M2) in the direction perpendicular to the flow is in the range of 0.8 to 1.2 (6 ) Or the molded article according to (7).

  In the present invention, a multi-layer structure in which a long fibrous filler is arranged at the center of a cross section of a fiber reinforced resin pellet and a composition containing a thermoplastic resin and a short fibrous filler is arranged in an outer layer portion around the same. Thus, it is possible to provide a fiber reinforced resin pellet that can be highly filled with a fibrous filler and has an excellent balance of mechanical properties, fluidity, appearance, and productivity.

  The fiber-reinforced resin pellet of the present invention will be specifically described below.

  The thermoplastic resin (A) used for the fiber reinforced resin pellet of the present invention is not particularly limited as long as it is a resin exhibiting thermoplasticity. For example, styrene resin, fluororesin, polyoxymethylene, polyamide, polyester, polyimide , Polyamideimide, Vinyl chloride, Olefin resin, Thermoplastic elastomer, Polyacrylate, Polyphenylene ether, Polycarbonate, Polyethersulfone, Polyetherimide, Polyetherketone, Polyetheretherketone, Polyarylene sulfide, Cellulose acetate, Cellulose acetate buty Examples thereof include cellulose derivatives such as rate, ethyl cellulose, liquid crystal resins, and the like, and one or more blends thereof.

  Examples of styrene resins include PS (polystyrene), HIPS (high impact polystyrene), AS (acrylonitrile / styrene copolymer), AES (acrylonitrile / ethylene / propylene / non-conjugated diene rubber / styrene copolymer), ABS (acrylonitrile / Examples thereof include butadiene / styrene copolymer) and MBS (methyl methacrylate / butadiene / styrene copolymer), and ABS is particularly preferable.

  Examples of the olefin resin include polypropylene, polyethylene, ethylene / propylene copolymer, ethylene / 1-butene copolymer, ethylene / propylene / nonconjugated diene copolymer, ethylene / ethyl acrylate copolymer, ethylene / methacrylic acid. Glycidyl copolymer, ethylene / vinyl acetate / glycidyl methacrylate copolymer and ethylene / propylene-g-maleic anhydride copolymer, methacrylic acid / methyl methacrylate / glutaric anhydride copolymer, etc. Polypropylene is particularly preferable from the viewpoints of properties and mechanical strength.

  Examples of the thermoplastic elastomer include a polyester polyether elastomer, a polyester polyester elastomer, a thermoplastic polyurethane elastomer, a thermoplastic styrene butadiene elastomer, a thermoplastic olefin elastomer, and a thermoplastic polyamide elastomer.

  The polyamide is not particularly limited as long as it has an amide bond in the repeating structure of the polymer. The method for producing the polyamide is not particularly limited, and examples thereof include ring-opening polymerization of lactams, polycondensation of diamine and dicarboxylic acid, and polycondensation of aminocarboxylic acid. Examples of diamines include aliphatic diamines, alicyclic diamines, and aromatic diamines. Examples of the diamine include tetramethylene diamine, hexamethylene diamine, undecamethylene diamine, dodecamethylene diamine, tridecamethylene diamine, 1,9-nonane diamine, 2-methyl-1,8-octane diamine, 2,2,4. -Trimethylhexamethylenediamine, 2,4,4-trimethylhexamethylenediamine, 5-methylnonamethylenediamine, 1,3-bisaminomethylcyclohexane, 1,4-bisaminomethylcyclohexane, m-phenylenediamine, p-phenylene Examples include diamine, m-xylylenediamine, and p-xylylenediamine. In embodiments, dicarboxylic acids include aliphatic dicarboxylic acids, alicyclic dicarboxylic acids, and aromatic dicarboxylic acids. Examples of the dicarboxylic acid include adipic acid, suberic acid, azelaic acid, sebacic acid, dodecanedioic acid, 1,1,3-tridecanedioic acid, 1,3-cyclohexanedicarboxylic acid, terephthalic acid, isophthalic acid, and naphthalenedicarboxylic acid. , And dimer acid. Examples of lactams include ε-caprolactam, enantolactam, and ω-laurolactam. Examples of the aminocarboxylic acid include ε-aminocaproic acid, 7-aminoheptanoic acid, 8-aminooctanoic acid, 9-aminononanoic acid, 11-aminoundecanoic acid, 12-aminododecanoic acid, and 13-aminotridecanoic acid. Is mentioned. Specific examples include nylon 6, nylon 46, nylon 66, nylon 11, nylon 12, nylon 610, nylon 612, nylon 6/66 copolymer, nylon 6/612, nylon MXD (m-xylylenediamine) 6, Nylon 9T etc. are mentioned. Copolymers having hexamethylene terephthalamide units such as nylon 6T / 66 copolymer, nylon 6T / 6I copolymer, nylon 6T / M5T copolymer, nylon 6T / 12 copolymer, nylon 66 / 6T / 6I copolymer and nylon 6T / 6 copolymer Coalescence is also preferred. Furthermore, it is also practically preferable to use a plurality of these polyamide resins as a mixture depending on required properties such as impact resistance and molding processability. The degree of polymerization of these polyamide resins is not particularly limited, but the relative viscosity measured at 25 ° C. in a 98% concentrated sulfuric acid solution having a sample concentration of 0.01 g / ml is in the range of 1.5 to 7.0. Nylon in the range of 2.0 to 6.0 is particularly preferable. For the polyamide resin, a copper compound is preferably used as an additive for improving long-term heat resistance. Of these, monovalent copper compounds, particularly monovalent copper halide compounds are preferred, and cuprous acetate, cuprous iodide, and the like can be exemplified as particularly suitable copper compounds. The addition amount of the copper compound is preferably 0.01 to 2 parts by weight, more preferably 0.015 to 1 part by weight with respect to 100 parts by weight of nylon. If the amount added is too large, liberation of metallic copper occurs during melt molding, and the value of the product is reduced by coloring. It is also possible to add an alkali halide in combination with a copper compound. As examples of the alkali halide compound, potassium iodide and sodium iodide are particularly preferable.

  The polyester is preferably a polymer or copolymer having a main structural unit of dicarboxylic acid or its ester-forming derivative and diol or its ester-forming derivative. Among them, polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polycyclohexanedimethylene terephthalate, polyethylene naphthalate, polypropylene naphthalate, polybutylene naphthalate, polyethylene isophthalate / terephthalate, polypropylene isophthalate / terephthalate, polybutylene isophthalate / terephthalate, Aromatic polyester resins such as polyethylene terephthalate / naphthalate, polypropylene terephthalate / naphthalate, and polybutylene terephthalate / naphthalate are particularly preferred, and polybutylene terephthalate is most preferred. In these polymers, the ratio of the terephthalic acid unit to the total dicarboxylic acid is preferably 30 mol% or more, and more preferably 40 mol% or more. Further, the polyester may contain one or more selected from hydroxycarboxylic acids or ester-forming derivatives thereof and lactones. Examples of the hydroxycarboxylic acid include glycolic acid, lactic acid, hydroxypropionic acid, hydroxybutyric acid, hydroxyvaleric acid, hydroxycaproic acid, hydroxybenzoic acid, p-hydroxybenzoic acid, and 6-hydroxy-2-naphthoic acid. Examples of the lactone include caprolactone, valerolactone, propiolactone, undecalactone, and 1,5-oxepan-2-one. Examples of the polymer or copolymer having these as a structural unit include aliphatic polyester resins such as polyglycolic acid, polylactic acid, polyglycolic acid / lactic acid, polyhydroxybutyric acid / β-hydroxybutyric acid / β-hydroxyvaleric acid. It is done. The melting point of the polyester is not particularly limited, but is preferably 120 ° C or higher, more preferably 180 ° C or higher, further preferably 200 ° C or higher, and 220 ° C or higher in terms of heat resistance. It is particularly preferred. Although an upper limit is not specifically limited, It is preferable that it is 300 degrees C or less, and it is more preferable that it is 280 degrees C or less. The melting point of the polyester is a value measured with a differential scanning calorimeter (DSC) at a heating rate of 20 ° C./min. The amount of the carboxyl terminal group of the polyester is not particularly limited, but is preferably 50 eq / t or less, more preferably 30 eq / t or less, in terms of fluidity, hydrolysis resistance and heat resistance, and 20 eq / It is more preferably t or less, and particularly preferably 10 eq / t or less. The lower limit is 0 eq / t. The amount of carboxyl terminal groups of the polyester resin is a value measured by dissolving in o-cresol / chloroform solvent and titrating with ethanolic potassium hydroxide. The viscosity of the polyester is not particularly limited as long as melt kneading is possible, but in terms of moldability, the intrinsic viscosity when the o-chlorophenol solution is measured at 25 ° C. is in the range of 0.36 to 1.60 dl / g. And is more preferably in the range of 0.50 to 1.25 dl / g. The molecular weight of the polyester resin is not particularly limited, but in terms of heat resistance, the weight average molecular weight (Mw) is preferably in the range of 50,000 to 500,000, more preferably in the range of 100,000 to 300,000. More preferably, it is in the range of 150,000 to 250,000. In the present invention, the molecular weight of the polyester is a value measured by gel permeation chromatography (GPC). The method for producing the polyester is not particularly limited, and can be produced by a known polycondensation method or ring-opening polymerization method. Either batch polymerization or continuous polymerization may be used, and any of transesterification and direct polymerization can be applied.

  The polycarbonate can be selected from aromatic homopolycarbonate and aromatic copolycarbonate. Examples of the production method include a phosgene method in which phosgene is blown into a bifunctional phenol compound in the presence of caustic alkali and a solvent, or a transesterification method in which a bifunctional phenol compound and diethyl carbonate are transesterified in the presence of a catalyst. Can do. The aromatic polycarbonate preferably has a viscosity average molecular weight in the range of 10,000 to 100,000. Here, the above bifunctional phenolic compounds are 2,2′-bis (4-hydroxyphenyl) propane, 2,2′-bis (4-hydroxy-3,5-dimethylphenyl) propane, bis (4-hydroxy). Phenyl) methane, 1,1′-bis (4-hydroxyphenyl) ethane, 2,2′-bis (4-hydroxyphenyl) butane, 2,2′-bis (4-hydroxy-3,5-diphenyl) butane 2,2′-bis (4-hydroxy-3,5-dipropylphenyl) propane, 1,1′-bis (4-hydroxyphenyl) cyclohexane, 1-phenyl-1,1′-bis (4-hydroxy) Phenyl) ethane and the like.

  Examples of polyarylene sulfides include polyphenylene sulfide (PPS), polyphenylene sulfide sulfone, polyphenylene sulfide ketone, random copolymers, block copolymers, and mixtures thereof. Among them, polyphenylene sulfide is particularly preferably used. Polyarylene sulfide is a generally known method, that is, a method for obtaining a polymer having a relatively small molecular weight described in JP-B No. 45-3368, or JP-B No. 52-12240 and JP-A No. 61-7332. Can be produced by, for example, a method for obtaining a polymer having a relatively large molecular weight. The polyarylene sulfide obtained as described above is crosslinked / high molecular weight by heating in air, heat treatment under an inert gas atmosphere such as nitrogen or under reduced pressure, washing with an organic solvent, hot water, acid aqueous solution, Of course, it is also possible to use it after performing various treatments such as activation with a functional group-containing compound such as an acid anhydride, amine, isocyanate, or a functional group-containing disulfide compound. Specific methods for crosslinking / high molecular weight polyarylene sulfide by heating include an atmosphere of an oxidizing gas such as air and oxygen, or a mixed gas atmosphere of the oxidizing gas and an inert gas such as nitrogen and argon. Thus, a method of heating until a desired melt viscosity is obtained at a predetermined temperature in a heating container can be exemplified. The heat treatment temperature in this case is preferably 150 to 280 ° C., more preferably 200 to 270 ° C., and the treatment time is preferably 0.5 to 100 hours. More preferably, a range of 2 to 50 hours is selected, but by controlling both, a target viscosity level can be obtained. Such a heat treatment apparatus may be a normal hot air dryer or a heating apparatus with a rotary or stirring blade. However, in the case of efficient and more uniform treatment, a heating apparatus with a rotary or stirring blade is used. Is more preferable. As a specific method for heat-treating polyarylene sulfide under an inert gas atmosphere such as nitrogen or under reduced pressure, heating is performed under an inert gas atmosphere such as nitrogen or under reduced pressure (preferably 7,000 Nm-2 or less). Examples of the method include heat treatment under conditions of a treatment temperature of 150 to 280 ° C, preferably 200 to 270 ° C, and a heating time of 0.5 to 100 hours, preferably 2 to 50 hours. Such a heat treatment apparatus may be a normal hot air dryer or a heating apparatus with a rotary or stirring blade. However, in the case of efficient and more uniform treatment, a heating apparatus with a rotary or stirring blade is used. Is more preferable. As a specific method for washing polyarylene sulfide with an organic solvent, for example, the organic solvent used for washing is not particularly limited as long as it does not have an action of decomposing polyarylene sulfide. it can. For example, nitrogen-containing polar solvents such as N-methylpyrrolidone, dimethylformamide, dimethylacetamide, sulfoxide sulfone solvents such as dimethyl sulfoxide, dimethylsulfone, ketone solvents such as acetone, methyl ethyl ketone, diethyl ketone, acetophenone, dimethyl ether, dipropyl ether , Ether solvents such as tetrahydrofuran, halogen solvents such as chloroform, methylene chloride, trichloroethylene, ethylene chloride, dichloroethane, tetrachloroethane, chlorobenzene, methanol, ethanol, propanol, butanol, pentanol, ethylene glycol, propylene glycol, Alcohol / phenolic solvents such as phenol, cresol, polyethylene glycol, benzene, Ene, and aromatic hydrocarbon solvents such as xylene may be used. Of these organic solvents, N-methylpyrrolidone, acetone, dimethylformamide, chloroform and the like are particularly preferably used. These organic solvents are used alone or in combination of two or more. As a method of washing with an organic solvent, there is a method of immersing a polyarylene sulfide resin in an organic solvent, and it is possible to appropriately stir or heat as necessary. There is no restriction | limiting in particular about the washing | cleaning temperature at the time of wash | cleaning polyarylene sulfide with an organic solvent, Arbitrary temperature of about normal temperature-about 300 degreeC can be selected. Although the cleaning efficiency tends to increase as the cleaning temperature increases, a sufficient effect is usually obtained at a cleaning temperature of room temperature to 150 ° C. The polyarylene sulfide resin that has been washed with an organic solvent is preferably washed several times with water or warm water in order to remove the remaining organic solvent. The following method can be illustrated as a specific method in the case of processing polyarylene sulfide with hot water. That is, in order to express a preferable chemical modification effect of the polyarylene sulfide resin by hot water washing, the water used is preferably distilled water or deionized water. The operation of the hot water treatment is usually performed by charging a predetermined amount of polyarylene sulfide into a predetermined amount of water, and heating and stirring at normal pressure or in a pressure vessel. The ratio of the polyarylene sulfide resin to water should be higher, and is preferably used at a bath ratio of 200 g or less per 1 liter of water. The following method can be illustrated as a specific method in the case of acid-treating polyarylene sulfide. That is, there is a method of immersing the polyarylene sulfide resin in an acid or an aqueous solution of the acid, and it is possible to appropriately stir or heat as necessary. The acid used is not particularly limited as long as it does not have the action of decomposing polyarylene sulfide, and is substituted with aliphatic saturated monocarboxylic acid such as formic acid, acetic acid, propionic acid, butyric acid, halo substitution such as chloroacetic acid, dichloroacetic acid, etc. Aliphatic unsaturated monocarboxylic acids such as aliphatic saturated carboxylic acids, acrylic acids and crotonic acids, aromatic carboxylic acids such as benzoic acid and salicylic acid, and dicarboxylic acids such as oxalic acid, malonic acid, succinic acid, phthalic acid and fumaric acid And inorganic acidic compounds such as sulfuric acid, phosphoric acid, hydrochloric acid, carbonic acid, and silicic acid. Of these acids, acetic acid and hydrochloric acid are particularly preferably used. The polyarylene sulfide subjected to the acid treatment is preferably washed several times with water or warm water in order to remove the remaining acid or salt. The water used for washing is preferably distilled water or deionized water in the sense that it does not impair the preferable chemical modification effect of polyarylene sulfide by acid treatment. The melt viscosity of polyarylene sulfide is preferably 80 Pa · s or less, more preferably 50 Pa · s or less, and even more preferably 20 Pa · s or less under conditions of 310 ° C. and a shear rate of 1000 / sec. Although there is no restriction | limiting in particular about a minimum, It is preferable that it is 5 Pa.s or more. Further, two or more polyarylene sulfides having different melt viscosities may be used in combination. When the melt viscosity of polyarylene sulfide exceeds 80 Pa · s, not only tends to be disadvantageous in terms of melt fluidity, but also the environmental stability of the laser focus tends to be inferior. Although it is not clear why the environmental stability of the laser focus decreases when the melt viscosity is high, it is likely to increase the anisotropy of deformation due to the temperature change of the molded body to promote the orientation of the fibrous filler during molding. It is estimated. The melt viscosity can be measured using a capillograph (manufactured by Toyo Seiki Co., Ltd.) apparatus under conditions of a die length of 10 mm and a die hole diameter of 0.5 to 1.0 mm.

  Of these thermoplastic resins, polyamide, styrene resin, polyolefin, polycarbonate, polyarylene sulfide and the like are preferable. Particularly, nylon 6, nylon 66, nylon 610, nylon 9T, ABS (acrylonitrile / butadiene / styrene copolymer), polypropylene, polycarbonate, polyphenylene sulfide and the like can be preferably used.

  The short fibrous filler (B1) having a weight average fiber length in the range of 0.1 to 0.5 mm used in the present invention is not particularly limited, but any filler having a fibrous shape may be used. Can be used. Specifically, glass fibers, PAN-based and pitch-based carbon fibers, stainless steel fibers, metal fibers such as aluminum fibers and brass fibers, organic fibers such as aromatic polyamide fibers, gypsum fibers, ceramic fibers, asbestos fibers, zirconia fibers , Alumina fiber, silica fiber, titanium oxide fiber, silicon carbide fiber, rock wool, potassium titanate whisker, silicon nitride whisker, wollastonite, alumina silicate fiber, whisker filler, metal (nickel, copper, cobalt, Non-metallic fibers (glass fibers, aramid fibers, polyester fibers, carbon fibers, etc.) coated with silver, aluminum, iron, and alloys thereof. Among the short fibrous fillers, PAN-based and pitch-based carbon fibers are preferred examples, and particularly preferred examples are PAN-based carbon fibers. The preferred weight average fiber length of the short fibrous filler (B1) is in the range of 0.1 to 0.5 mm, more preferably 0.125 to 0.45 mm, and particularly preferably 0.15 to 0.40 mm. is there. When the thickness is 0.1 mm or less, a sufficient bending elastic modulus improvement effect cannot be obtained, and when the thickness is 0.40 mm or more, the surface appearance is deteriorated. Here, the weight average fiber length is obtained by dissolving the obtained pellets or molded article with a solvent in which the polyamide resin dissolves, and then filtering and washing, and observing the residue with an optical microscope. The measurement results are obtained by calculating the weight average fiber length. On the surface of the short fibrous filler (B1), for the purpose of improving the wettability of the resin and improving the handleability, a material to which a coupling agent or a sizing agent is attached may be used. Examples of the coupling agent include amino-based, epoxy-based, chloro-based, mercapto-based, and cationic-based silane coupling agents, and amino-based silane coupling agents can be suitably used. Examples of the sizing agent include a sizing agent containing at least one selected from a maleic anhydride compound, a urethane compound, an acrylic compound, an epoxy compound, a phenol compound, and derivatives of these compounds. A sizing agent containing a compound can be suitably used. The content of the sizing agent in the short fibrous filler (B1) is preferably 0.1 to 10.0% by weight, more preferably 0.3 to 8.0% by weight, and 0.5 to 6 0.0% by weight is particularly preferred. In addition, the form of the short fiber filler (B1) used at the time of melt kneading is not limited as long as it is a form that can be added to the melt kneader, and chopped strands, crushed fibers, continuous long fibers, etc. that have been cut in advance are used. From the viewpoint of productivity, chopped strands can be preferably used.

  The long fibrous filler (B2) used in the present invention is not particularly limited, but any filler having a fibrous shape can be used. Specifically, glass fibers, PAN-based and pitch-based carbon fibers, stainless steel fibers, metal fibers such as aluminum fibers and brass fibers, organic fibers such as aromatic polyamide fibers, gypsum fibers, ceramic fibers, asbestos fibers, zirconia fibers , Alumina fiber, silica fiber, titanium oxide fiber, silicon carbide fiber, rock wool, potassium titanate whisker, silicon nitride whisker, wollastonite, alumina silicate fiber, whisker filler, metal (nickel, copper, cobalt, Non-metallic fibers (glass fibers, aramid fibers, polyester fibers, carbon fibers, etc.) coated with silver, aluminum, iron, and alloys thereof. Among the short fibrous fillers, PAN-based and pitch-based carbon fibers are preferred examples, and particularly preferred examples are PAN-based carbon fibers. On the surface of the short fibrous filler (B1), for the purpose of improving the wettability of the resin and improving the handleability, a material to which a coupling agent or a sizing agent is attached may be used. Examples of the coupling agent include amino-based, epoxy-based, chloro-based, mercapto-based, and cationic-based silane coupling agents, and amino-based silane coupling agents can be suitably used. Examples of the sizing agent include a sizing agent containing at least one selected from a maleic anhydride compound, a urethane compound, an acrylic compound, an epoxy compound, a phenol compound, and derivatives of these compounds. A sizing agent containing a compound, an epoxy compound, or a phenolic compound can be suitably used. The content of the sizing agent in the long fibrous filler (B2) is preferably 0.05 to 2.0% by weight, more preferably 0.08 to 1.5% by weight, and 0.1 to 1%. 0.0% by weight is particularly preferred. Further, the form of the long fiber filler (B1) used at the time of coating blending is not limited as long as it is a form that can be drawn by the pultrusion method or the wire coating method, but continuous long fibers are preferably used. it can.

  The method for producing fiber-reinforced resin pellets of the present invention is such that the short fibrous filler (B1) is blended with the thermoplastic resin (A) in advance before blending with the long fibrous filler (B2), and the continuous long length is obtained. By coating and blending the fibrous filler (B2), the fibrous filler can be highly filled, and fiber reinforced resin pellets with excellent balance of mechanical properties, fluidity, appearance, and productivity can be obtained. is important. That is, a composition in which the thermoplastic resin (A) and the short fibrous filler (B1) are previously melt-kneaded and the weight average fiber length of the short fibrous filler (B1) is controlled in the range of 0.1 to 0.5 mm. After the product is obtained, it is formed by pultrusion by a pultrusion method, a wire coating method or the like, coating and blending into pellets.

  At this time, it is important that all the long fibrous fillers (B2) are long fibers arranged in the same length as the pellets, and the length is 3 to 30 mm. The short fibrous filler (B1) alone is not preferable because it is excellent in appearance but does not lead to improvement in mechanical properties. Further, the long fibrous filler (B2) alone is not preferable because the filler cannot be filled at a high rate and the productivity is greatly reduced. The shape of the fiber-reinforced resin pellet of the present invention is not particularly limited, but is preferably a cylindrical shape having a diameter of 1 to 5 mm and a pellet length of 3 to 30 mm. If the diameter is too small, the production becomes difficult, and if it is too large, it may be difficult to supply to the molding machine at the time of injection molding and supply may be difficult. Since the pellet length is substantially the carbon fiber length, if it is too short, the characteristics of the present invention may not be sufficiently obtained, and if it is too long, supply to the injection molding machine becomes difficult, which is not preferable.

  In the fiber reinforced resin pellet manufacturing method, the method of blending the fibrous filler (B1) with the thermoplastic resin (A) in advance is preferably a melt-kneading method, and the thermoplastic resin (A) and the fibrous filler. The temperature setting of the melt-kneading apparatus during production of the blend with the material (B1) is preferably performed at a melting point (Tm) of the thermoplastic resin to be used + 30 ° C. or higher or a glass transition point (Tg) + 120 ° C. or higher. The raw material supply position of the melt-kneading apparatus for supplying the thermoplastic resin (A) and the fibrous filler (B1) is not particularly limited, but the thermoplastic raw material supply port is preferable for the thermoplastic resin (A), and the fibrous filler (B1 ), There is no particular limitation, but between the main raw material supply port and the discharge port, specifically, the seal zone closest to the main raw material supply port in the screw element design and / or the seal zone closest to the mixing zone and the discharge port and An intermediate position in the mixing zone is preferable because the weight average fiber length can be easily controlled. There is no restriction | limiting in particular as a melt-kneading apparatus which manufactures the above, For resin processing which can heat-melt-mix a thermoplastic resin (A) and a fibrous filler (B1) under a moderate shear field. Melt-kneading apparatuses such as known extruders and continuous kneaders used can be used. For example, a single screw extruder and kneader with one screw, a twin screw extruder and kneader with two screws, a multi-screw extruder and kneader with three or more screws, and an extruder and kneader with one screw There are no particular restrictions, such as a tandem extruder in which two machines, an extruder and two kneaders are connected, an extruder and a kneader in which side feeders that can only supply raw materials without being melt-kneaded are installed. In the screw element design, there is no particular limitation on the combination of a melting or non-melting conveyance zone having a full flight screw, a sealing zone having a seal ring, etc., a mixing zone having unimelt, kneading, etc. A continuous melt kneader with two or more mixing zones and two or more raw material supply ports is preferred, and a twin shaft having two or more seal zones and / or mixing zones and two or more raw material supply ports A continuous melt kneader having a screw part is more preferable, and a twin-screw extruder having two or more seal zones and / or mixing zones and two or more raw material supply ports is most preferable.

  As a method of coating and blending with the composition of the thermoplastic resin (A) and the fibrous filler (B1) obtained by melt-kneading the long fibrous filler (B2) in advance, a pultrusion method, a wire coating method, or the like can be used. The method of coating and blending is preferable, and the melting point (Tm) of the thermoplastic resin used in the blend of the thermoplastic resin (A) and the fibrous filler (B1) + 30 ° C. or higher, or the glass transition point (Tg) + 120 ° C. or higher. Preferably it is done. Examples of the means for producing the above include a pultrusion method and a wire coating method, but there is no particular limitation. The long fibrous filler (B2) is a composition of a thermoplastic resin (A) and a fibrous filler (B1). It is possible to use known pultrusion machines that can be coated. For example, the coating melt kneader includes a single screw extruder and kneader with one screw, a twin screw extruder and kneader with two screws, a multi-screw extruder and kneader with three or more screws, and an extruder. There are no particular limitations, such as an extruder with one machine and kneader, a tandem extruder in which two extruders and two kneaders are connected, and an extruder and kneader with side feeders that can only supply raw materials without melting and kneading. Coating device having a dipping bath with a resin impregnating roller that is filled with resin at the tip of the melt kneading device and capable of resin impregnation and pultrusion, and a coating for electric wire coating that does not substantially impregnate the melt kneading device at the tip An apparatus having a die is preferable, and an apparatus having a coating die for coating an electric wire that does not substantially impregnate the resin at the tip of the coating melt kneading apparatus can be more preferably used. By cooling the resin-coated long fiber strands drawn with these devices and cutting them to a predetermined length with a strand cutter, all the long fibers are arranged in the same length as the pellets, and the length is 3 to 30 mm. Long fiber reinforced resin pellets are obtained. In particular, a production method in which the fibrous filler (B1) is melt-kneaded with the thermoplastic resin (A) in advance using the coating melt-kneading apparatus used in the coating formulation is preferable because the productivity is improved.

  The blending amount of the thermoplastic resin (A), the short fibrous filler (B1) and the long fibrous filler (B2) in the present invention is 30 to 80 thermoplastic resins (A) with respect to 100 parts by weight of the total composition. Parts by weight, 5 to 40 parts by weight of short fiber filler (B1) and 15 to 40 parts by weight of long fiber filler (B2), preferably 40 to 70 parts by weight of thermoplastic resin (A), short fiber 10 to 30 parts by weight of filler (B1) and 18 to 35 parts by weight of long fibrous filler (B2), more preferably 45 to 65 parts by weight of thermoplastic resin (A), 15 to 15 of short fibrous filler (B1) 25 parts by weight and 20-30 parts by weight of the long fibrous filler (B2). When the blending amount of the thermoplastic resin is less than 30 parts by weight, the moldability and the surface appearance are deteriorated, which is not preferable, and when it is 80 parts by weight or more, a sufficient bending elastic modulus improvement effect cannot be obtained.

  The fiber reinforced resin pellet obtained by the above production method is a form in which the long fibrous filler (B2) is coated and blended with the composition of the thermoplastic resin (A) and the short fibrous filler (B1), The long fibrous filler (B2) is disposed at the center of the cross section of the fiber reinforced resin pellet, and the composition of the thermoplastic resin (A) and the short fibrous filler (B1) is disposed in the outer layer portion around it. A multilayer structure is preferred. The long fibrous filler (B2) is arranged at the center of the pellet cross section, but if the blending amount is 40 parts by weight or more, the bundle shape of the long fibrous filler (B2) tends to be atypical and cannot be coated sufficiently. Since the fiber bundle protrudes outside and deteriorates the productivity, it is not preferable, and if it is less than 15 parts by weight, a sufficient effect of improving the flexural modulus cannot be obtained.

  The blending amount of the long fibrous filler (B2) of the present invention is 20 to 80% by weight of the total amount of the short fibrous filler (B1) and the long fibrous filler (B2), and more preferably 30 to 70%. % By weight, most preferably 35-65% by weight. When the blending amount of the long fibrous filler (B2) is less than 20% by weight of the total amount of the short fibrous filler (B1) and the long fibrous filler (B2), a sufficient bending elastic modulus improvement effect cannot be obtained. It is not preferable, and if it exceeds 80% by weight, the moldability and surface appearance are deteriorated, which is not preferable. The blend amount of the short fibrous filler (B1) of the present invention is 60% by weight or less, more preferably 50% by weight or less of the total amount of the thermoplastic resin (A) and the short fibrous filler (B1). Most preferably, it is 40% by weight or less. If the amount of the short fibrous filler (B1) exceeds 60% by weight of the total amount of the thermoplastic resin (A) and the short fibrous filler (B1), the long fibrous filler (B2) cannot be coated. The fiber bundle is not preferable because it protrudes and decreases the productivity.

  In the fiber reinforced resin pellet of the present invention, a non-fibrous filler can be used in combination with the short fibrous filler (B1). The non-fibrous filler is not particularly limited, and any filler such as a plate, a powder, and a granule can be used. Specifically, silicates such as talc, zeolite, sericite, mica, kaolin, clay, pyrophyllite, bentonite, metal compounds such as magnesium oxide, alumina, zirconium oxide, iron oxide, calcium carbonate, magnesium carbonate, dolomite Carbonates such as calcium sulfate, sulfate such as barium sulfate, glass beads, ceramic beads, boron nitride, calcium phosphate, calcium hydroxide, magnesium hydroxide, aluminum hydroxide and other hydroxides, glass flakes, glass Non-fibrous fillers such as powder, glass balloons, carbon black and silica, graphite, and smectite clay minerals such as montmorillonite, beidellite, nontronite, saponite, hectorite, and soconite, vermiculite, and halloysite Layered silicates typified by swellable mica such as various clay minerals such as kanemite, kenyanite, zirconium phosphate, titanium phosphate, Li-type fluorine teniolite, Na-type fluorine teniolite, Na-type tetrasilicon fluorine mica, Li-type tetrasilicon fluorine mica Is mentioned. The layered silicate may be a layered silicate in which exchangeable cations existing between layers are exchanged with organic onium ions. Examples of organic onium ions include ammonium ions, phosphonium ions, sulfonium ions, and the like. Two or more kinds of fibrous fillers can be used in combination. These non-fibrous fillers are preferably treated with a coupling agent such as a silane or titanate, or other surface treatment agent, and when treated with an epoxy silane or aminosilane coupling agent, it is excellent. It is particularly preferable because it can exhibit mechanical properties. Of these non-fibrous fillers, glass flakes and glass beads are preferably used. The compounding amount of the non-fibrous filler in the present invention is 5 to 100 parts by weight, preferably 10 to 80 parts by weight, and more preferably 15 to 60 parts by weight with respect to 100 parts by weight of the total composition. When the blending amount is less than 5 parts by weight, a sufficient mechanical property improving effect cannot be obtained, and when it exceeds 100 parts by weight, the moldability and the surface appearance are deteriorated.

  Further, the fiber-reinforced resin pellets of the present invention are within the range not impairing the effects of the present invention, such as hindered phenol compounds, phosphite compounds, polyalkylene oxide oligomer compounds, thioether compounds, ester compounds, organophosphorus compounds, etc. Mold release agents such as plasticizers, talc, kaolin, organophosphorus compounds, polyether ether ketone and other crystal nucleating agents, polyolefin compounds, silicone compounds, long chain aliphatic ester compounds, long chain aliphatic amide compounds, etc. Add usual additives such as lubricants, anticorrosives, anti-coloring agents, antioxidants, heat stabilizers, lubricants such as lithium stearate, aluminum stearate, flame retardants, UV inhibitors, colorants, foaming agents Can do.

  The fiber reinforced resin pellets of the present invention thus obtained are excellent in the mechanical properties, fluidity, surface appearance, etc., which are the characteristics of the short fibrous filler (B1) and the long fibrous filler (B2), and in particular bending elasticity. A fiber reinforced resin pellet excellent in rate and productivity can be obtained. Among them, it is useful for injection molded products such as automobile parts, electrical / electronic parts, sports equipment parts, etc., which have a thin portion with a thickness of 0.1 to 2.0 mm, and molded products that require dimensional accuracy.

  The fiber reinforced resin pellet of the present invention can be processed into a molded product having excellent surface appearance (gloss) and mechanical properties by a molding method such as normal injection molding, extrusion molding, or press molding.

  Further, the bending elastic modulus (M1) in the flow direction of the molded product obtained from the fiber reinforced resin pellet of the present invention is preferably 20 GPa or more, more preferably 30 GPa or more, particularly preferably 35 GPa or more, and metal below 20 GPa. It cannot be said that the rigidity is equivalent.

  Further, the ratio (M2 / M1) of the bending elastic modulus (M1) in the flow direction and the bending elastic modulus (M2) perpendicular to the flow of the molded product obtained from the fiber reinforced resin pellet of the present invention is 0.6 or more. More preferably, it is 0.7 or more, particularly preferably 0.8 or more, and the performance equivalent to that of metal is isotropic (flexural modulus in the flow direction / flexural modulus in the direction perpendicular to the flow) ) Is also important, and if it is 0.6 or less, the anisotropy is strong and undesirable.

  In the present invention, the above-mentioned various molded products can be used for various applications such as automobile parts, electrical / electronic parts, building members, sports equipment parts, various containers, daily necessities, household goods and sanitary goods. Specific applications include air flow meters, air pumps, thermostat housings, engine mounts, ignition hobbins, ignition cases, clutch bobbins, sensor housings, idle speed control valves, vacuum switching valves, ECU housings, vacuum pump cases, inhibitor switches, rotations Sensor, Accelerometer, Distributor cap, Coil base, ABS actuator case, Radiator tank top and bottom, Cooling fan, Fan shroud, Engine cover, Cylinder head cover, Oil cap, Oil pan, Oil filter, Fuel cap, Fuel strainer , Distributor cap, vapor canister Automotive underhood parts such as uzing, air cleaner housing, timing belt cover, brake booster parts, various cases, various tubes, various tanks, various hoses, various clips, various valves, various pipes, torque control lever, safety belt parts, Car interior parts such as register blade, washer lever, window regulator handle, window regulator handle knob, passing light lever, sun visor bracket, various motor housings, roof rail, fender, garnish, bumper, door mirror stay, spoiler, food louver, Wheel covers, wheel caps, grill apron cover frames, lamp reflectors, lamp bezels, door handles, etc. Car exterior parts, relay cases, coil bobbins, optical pickup chassis, motor cases, laptop housings, chassis and internal parts, CRT display housings and internal parts, printer housings and internal parts, mobile phones, mobile PCs, handheld mobiles, etc. Mobile terminal housing, chassis and internal parts, recording medium (CD, DVD, PD, FDD, etc.) drive housing, chassis and internal parts, copier housing, chassis and internal parts, facsimile housing, chassis and internal parts, Electric and electronic parts typified by parabolic antennas can be mentioned. Furthermore, VTR parts, TV parts, irons, hair dryers, rice cooker parts, microwave oven parts, acoustic parts, video camera parts, video equipment parts such as projectors, laser discs (registered trademark), compact discs (CD), CD-ROMs , CD-R, CD-RW, DVD-ROM, DVD-R, DVD-RW, DVD-RAM, Blu-ray disc and other optical recording media substrates, lighting parts and housings, chassis parts, refrigerator parts, air conditioner parts, type Home and office electrical product parts represented by lighter parts and word processor parts can be listed. Also, housings, chassis and internal parts for electronic musical instruments, home game machines, portable game machines, various gears, various cases, sensors, LEP lamps, connectors, sockets, resistors, relay cases, switches, coil bobbins, capacitors, Variable capacitor case, optical pickup, oscillator, various terminal boards, transformer, plug, printed wiring board, tuner, speaker, microphone, headphones, small motor, magnetic head base, power module, semiconductor, liquid crystal, FDD carriage, FDD chassis, Electric and electronic parts such as motor brush holders, transformer members, coil bobbins, sash doors, blind curtain parts, piping joints, curtain liners, blind parts, gas meter parts, water meter parts, water heater parts Roof panels, insulation walls, adjusters, plastic bundles, ceiling fishing gear, stairs, doors, floors and other construction parts, concrete formwork and other civil engineering parts, fishing rod parts, reel housing and chassis parts, lure parts, cooler box parts , Golf club parts, tennis, badminton, squash racket parts, ski parts, ski stock parts, bicycle frames, pedals, front forks, handlebars, cranks, seat pillars, wheels, etc., boat oars, sports Helmets, fence components, golf tees, sports equipment parts such as kendo armor (face) and bamboo swords, gears, screws, springs, bearings, levers, key stems, cams, ratchets, rollers, water supply parts, toy parts, cable ties , Clips, fans, pipes, cleaning jigs, Machine parts, microscopes, binoculars, cameras, watches and other mechanical parts, seedling pots, vegetation piles, farming parts such as farm-bi stoppers, medical supplies such as fracture reinforcement, trays, blisters, knives, forks, spoons Tubes, plastic cans, pouches, containers, tanks, containers such as baskets, hot-fill containers, microwave cooking containers, cosmetic containers, IC trays, stationery, drainage filters, bags, chairs, tables, cooler boxes It is useful as Kade, hose reel, planter, hose nozzle, dining table, desk surface, furniture panel, kitchen cabinet, pen cap, gas lighter and so on. In particular, it is useful as an interior part for automobiles, exterior parts for automobiles, sports equipment members, and housings, chassis and internal parts for various electric / electronic parts.

The fiber reinforced resin pellets and molded articles of the present invention can be recycled. For example, the resin composition and a molded product comprising the same can be pulverized, and preferably made into a powder form, and then used with additives as necessary, but can be obtained when fiber breakage occurs. It is difficult for the resin composition to exhibit the same mechanical strength as the molded article of the present invention.

  In order to describe the present invention more specifically, examples and comparative examples will be described below, but the present invention is not limited to these examples. In the examples, the number of parts and wt% indicate parts by weight and wt%, respectively.

(A) Thermoplastic resin <A-1> Nylon 6 resin “Amilan” CM1001 (manufactured by Toray Industries, Inc.) was used.

(B1) Short fiber filler <B1-1> Carbon fiber “Torayca” cut fiber TV14-006 (manufactured by Toray Industries, Inc.) was used.

(B2) Long fibrous filler <B2-1> Carbon fiber “Torayca” T700SC-12K-50C (manufactured by Toray Industries, Inc.) was used.

[Examples 1-5, Comparative Examples 1-5]
In the composition of the reference examples described in Table 1 (excluding Reference Example 5), the thermoplastic resin (A) was set in the conditions shown in the table after being supplied to the main hopper of the twin-screw extruder (TEX30α manufactured by Nippon Steel) The short fiber filler (B1) is supplied into the molten resin using a side feeder, the strand discharged from the die is cooled in water, and cut into a length of 3.0 mm by a strand cutter and pelletized. Thus, short fiber reinforced resin pellets were obtained. To the main hopper of the twin-screw extruder (TEX30α manufactured by Nippon Steel) with the composition of Reference Example 5 shown in Table 1 and the thermoplastic resin (A) and short fibrous filler (B1) set to the conditions shown in the table The strand discharged from the die was cooled in water, cut into a length of 3.0 mm with a strand cutter, and pelletized to obtain short fiber reinforced resin pellets. However, in Reference Example 6, since the resin was decomposed by shearing heat generation and the amount of short fibrous filler was large, the strand take-up property was poor and it was difficult to produce.

  Furthermore, for the wire coating method installed at the tip of a short shaft extruder having a diameter of 40 mm, in which the long fibrous filler (B2) was set to various conditions shown in the table with the compositions of Examples and Comparative Examples described in Table 2. The reference example composition continuously passed through the coating die and discharged from the extruder, and melted in the die from the extruder so as to cover the periphery of the long fibrous filler (B2). After the arrangement, the strand was cooled in water and cut into a length of 7 mm with a strand cutter to produce a fiber reinforced resin pellet. (At this time, the fiber length of the long fibrous filler (B2) is 7 mm because it is cut in parallel with each other.)

  The fiber reinforced resin pellets obtained above were vacuum dried at 80 ° C. for a whole day and night, and using an injection molding machine (SG75H-MIV manufactured by Sumitomo Heavy Industries, Ltd.) under the conditions in the table, the injection speed was 100 mm / sec, and the injection pressure was the lower limit. Each test piece was molded at a pressure of +1 MPa, and the physical properties were measured under the following conditions.

  [Fiber length]: The short fiber reinforced resin pellets obtained in the reference example were dissolved in formic acid, filtered, and the residue was observed with an optical microscope at a magnification of 20 to 100 times. The thickness was measured to determine the weight average fiber length (mm).

  [Productivity]: 10 kg of the fiber reinforced resin pellets obtained in the examples and comparative examples are put into a 30 L rocking mixer (manufactured by Aichi Electric Co., Ltd.), and the rotational speed is 35 rpm, the rocking angle is 40 °, and the rocking number is 17. The mixture was stirred and mixed for 30 minutes under the condition of 8 times / min, and the non-defective rate (wt%) after removing the cracks, fluff and the like from the pellets was determined.

  [Impact resistance]: Charpy impact strength (no notch) was evaluated at 23 ° C. according to ISO 179.

  [Bending strength]: A test piece having a thickness of 150 mm × 150 mm × 4 mm was cut into a width of 10 mm in each of the flow direction and the direction perpendicular to the flow, and the bending strength of the test piece was evaluated according to ISO 178.

  [Bending elastic modulus]: A test piece having a thickness of 150 mm × 150 mm × 4 mm was cut into a width of 10 mm in each of the flow direction and the direction perpendicular to the flow, and the bending elastic modulus of the test piece was evaluated according to ISO 178.

  [Heat resistance]: Heat resistance was evaluated according to ISO 75 (load: 1.80 MPa).

  [Dimensional stability]: With respect to a test piece having a thickness of 150 mm x 150 mm x 4 mm, three points each in the flow direction and the direction perpendicular to the flow were measured with a caliper, and the molding shrinkage was determined from the average value.

  [Spiral flow length]: Using a mold having a width of 10 mm and a width of 2 mm, the flow length was measured when molding was performed under the temperature conditions shown in the table, an injection speed of 100 mm / sec, and an injection pressure of 80 MPa. The flow length is an average value of 20 shots.

  From Examples 1 to 4 and Comparative Examples 1 to 5, as in the present invention, the thermoplastic resin (A), the short fibrous filler (B1) having a weight average fiber length of 0.1 to 0.5 mm, and the fiber length of 3 are used. It is a fiber reinforced resin pellet made of a fiber reinforced resin composition obtained by blending a ~ 30 mm long fibrous filler (B2), and all of the long fibrous filler (B2) are arranged in the same length as the pellet. The fiber reinforced resin pellets are characterized by high productivity (non-defective product rate), high flexural modulus, and high fluidity, despite the high filling of fibrous fillers. Excellent. Specifically, in Comparative Examples 3 and 5, when the fibrous filler is highly filled with the long fiber filler (B2) alone or the short fiber filler (B1) alone, the productivity (good product rate) is greatly reduced. Cannot be manufactured. In Comparative Example 1, when the weight average fiber length of the short fiber filler (B1) is 0.1 mm or less, the flexural modulus is slightly improved, but desired characteristics cannot be obtained.

The fiber-reinforced resin pellet of the present invention can be used for various applications such as automobile interior parts, automobile exterior parts, sports equipment members, housings of various electric / electronic parts, chassis and internal parts.

Claims (8)

Fiber formed by blending thermoplastic resin (A), short fibrous filler (B1) having a weight average fiber length of 0.1 to 0.5 mm, and long fibrous filler (B2) having a fiber length of 3 to 30 mm A fiber reinforced resin pellet made of a reinforced resin composition, wherein all of the long fibrous fillers (B2) are arranged in the same length as the pellet. 100 to 100 parts by weight of the fiber reinforced resin composition, 20 to 80 parts by weight of the thermoplastic resin (A), 5 to 40 parts by weight of the short fibrous filler (B1) and 15 to 40 parts by weight of the long fibrous filler (B2) The fiber-reinforced resin pellet according to claim 1, comprising a fiber-reinforced resin composition comprising The blending amount of the long fibrous filler (B2) is such that the total amount of the short fibrous filler (B1) and the long fibrous filler (B2) is 100% by weight. Is 20 to 80% by weight, and the total amount of the thermoplastic resin (A) and the short fibrous filler (B1) is 100% by weight, and the blended amount of the short fibrous filler (B1) is 60% by weight or less. The fiber-reinforced resin pellet according to claim 1 or 2. The fiber reinforced resin pellet according to any one of claims 1 to 3, wherein the short fibrous filler (B1) and / or the long fibrous filler (B2) are carbon fibers. The short fiber reinforced resin composition in which the long fiber filler (B2) is disposed at the center of the cross section of the fiber reinforced resin pellet and the thermoplastic resin (A) and the short fiber filler (B1) are blended is an outer layer around the resin. The fiber-reinforced resin pellet according to any one of claims 1 to 4, wherein the fiber-reinforced resin pellet is disposed in a portion. The molded product formed by shape | molding the fiber reinforced resin pellet in any one of Claims 1-5. The molded article according to claim 6, wherein the bending elastic modulus (M1) in the flow direction is 20 GPa or more. The ratio (M2 / M1) of the bending elastic modulus (M1) in the flow direction to the bending elastic modulus (M2) in the direction perpendicular to the flow is in the range of 0.8 to 1.2. Articles described in 1.