Glass fiber reinforced resin composition and glass fiber reinforced resin molded product

Abstract

Provided is a glass-fiber-reinforced resin composition which gives molded glass-fiber-reinforced resin articles excellent in terms of strength and modulus and which, when producing the molded glass-fiber-reinforced resin articles, has excellent processability. The glass-fiber-reinforced resin composition has an SiO2 content S and an Al2O3 content A of 48-70 mass% and 9-30 mass%, respectively, with respect to all the glass fibers contained therein. The glass fibers have a flat cross-sectional shape having a minor-axis length DS of 6.0-15.0 μm and a major-axis length DL of 20.5-50.0 μm. The glass-fiber-reinforced resin composition has a glass fiber content C of 65.0-85.0 mass%, the S, A, DS, DL, and C satisfying relationship (1).　Relationship (1): 2.24≤(100×(A2 / S)×(C / 100)8) / (DS3 / 4×DL1 / 4)≤5.85

Description

[Technical field]

[0001] The present invention relates to a glass fiber reinforced resin composition and a glass fiber reinforced resin molded product. [Background technology]

[0002] In recent years, attention has been focused on glass fiber reinforced plastic molded products as a substitute for metals, and in order to expand the range of substitutes, glass fiber reinforced plastic molded products are required to have a higher level of mechanical strength than before.

[0003] Conventionally, attempts have been made to increase the mechanical strength of glass fiber reinforced resin molded products by flattening the cross-sectional shape of glass fibers, which are normally circular, by reducing the fiber diameter of glass fibers, by using glass fibers with a high strength composition having a high content of SiO2 and Al2O3, or by combining these methods (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2019 / 216443 [Patent Document 2] International Publication No. 2017 / 171102 Summary of the Invention [Problem to be solved by the invention]

[0005] According to the above-mentioned attempts, although the strength of the glass fiber reinforced resin molded product is improved, there is a problem that the improvement of the elastic modulus is insufficient. In order to solve the above problem and improve the elastic modulus, it is considered to increase the glass fiber content in the glass fiber reinforced resin molded product.

[0006] However, when the glass fiber content in the glass fiber reinforced resin molded product is increased, the processability during production of the glass fiber reinforced resin molded product deteriorates, which makes it difficult to produce the glass fiber reinforced resin molded product.

[0007] The present invention aims to provide a glass fiber reinforced resin composition which overcomes such disadvantages and has excellent strength and elastic modulus when processed into a glass fiber reinforced resin molded product and excellent processability when producing the glass fiber reinforced resin molded product, and a glass fiber reinforced resin molded product using the same. [Means for solving the problem]

[0008] In order to achieve this object, the present invention provides a glass fiber reinforced resin composition, , Po the glass fibers contained in the glass fiber reinforced resin composition have a SiO2 content S in the range of 48 to 70 mass% relative to the total amount of glass fibers, the glass fibers contained in the glass fiber reinforced resin composition have an Al2O3 content A in the range of 9 to 30 mass% relative to the total amount of glass fibers, the glass fibers have a flat cross-sectional shape with a short diameter DS in the range of 6.0 to 15.0 μm and a long diameter DL in the range of 30.5 to 50.0 μm, the glass fiber content C in the glass fiber reinforced resin composition is in the range of 65.0 to 85.0 mass%, and the S, A, DS, DL and C satisfy the following formula (1): 2.24≦(100×(A 2 / S)×(C / 100) 8 ) / (DS 3 / 4 ×DL 1 / 4 )≦5.85 (1)

[0009] According to the glass fiber reinforced resin composition of the present invention, by having the above-mentioned S, A, DS, DL and C in the above-mentioned ranges and satisfying the condition of formula (1), excellent strength and elastic modulus can be obtained when processed into a glass fiber reinforced resin molded product, and excellent processability can be obtained when manufacturing the glass fiber reinforced resin molded product. Here, having excellent strength means that the bending strength of the glass fiber reinforced resin molded product is 325 MPa or more. Also, having excellent elastic modulus means that the elastic modulus of the glass fiber reinforced resin molded product is 25 GPa or more.

[0010] The glass fiber reinforced resin composition of the present invention can obtain excellent strength and elastic modulus when processed into a glass fiber reinforced resin molded product, and can obtain particularly excellent processability when producing the glass fiber reinforced resin molded product. Therefore, it is preferable that the S is in the range of 50 to 60 mass%, the A is in the range of 10 to 20 mass%, the DS is in the range of 7.5 to 13.0 μm, the DL is in the range of 30.5 to 48.0 μm, and the C is in the range of 70.5 to 82.5 mass%, and the S, A, DS, DL, and C satisfy the following formula (2). 2.27≦(100×(A 2 / S)×(C / 100) 8 ) / (DS 3 / 4 ×DL 1 / 4 )≦4.30 (2)

[0011] The glass fiber reinforced resin composition of the present invention can obtain particularly excellent strength and excellent elastic modulus when processed into a glass fiber reinforced resin molded product, and can obtain particularly excellent processability when manufacturing a glass fiber reinforced resin molded product, and can further obtain excellent impact resistance. Therefore, it is more preferable that the S is in the range of 50 to 60 mass%, the A is in the range of 10 to 20 mass%, the DS is in the range of 7.5 to 13.0 μm, the DL is in the range of 30.5 to 48.0 μm, the C is in the range of 70.5 to 82.5 mass%, and the S, A, DS, DL, and C satisfy the following formula (3). Here, having particularly excellent strength means that the bending strength of the glass fiber reinforced resin molded product is 340 MPa or more. In addition, excellent impact resistance means that the Charpy impact strength of a glass fiber reinforced plastic molded product is 25 kJ / m 2 This means that it is more than or equal to this. 2.29≦(100×(A 2 / S)×(C / 100) 8 ) / (DS 3 / 4 ×DL 1 / 4 )≦3.37 (3)

[0014] The glass fiber reinforced resin molded product of the present invention is characterized by comprising the above-mentioned glass fiber reinforced resin composition of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Next, the embodiment of the present invention will be described in more detail.

[0016] The glass fiber reinforced resin composition of the present embodiment is a glass fiber reinforced resin composition, , Po The glass fibers contained in the glass fiber reinforced resin composition have a SiO2 content S in the range of 48 to 70 mass% relative to the total amount of glass fibers, and the glass fibers contained in the glass fiber reinforced resin composition have an Al2O3 content A in the range of 9 to 30 mass% relative to the total amount of glass fibers. The glass fibers have a flat cross-sectional shape with a short diameter DS in the range of 6.0 to 15.0 μm and a long diameter DL in the range of 30.5 to 50.0 μm. The glass fiber content C in the glass fiber reinforced resin composition is in the range of 65.0 to 85.0 mass%, and the S, A, DS, DL and C satisfy the following formula (1). 2.24≦(100×(A 2 / S)×(C / 100) 8 ) / (DS 3 / 4 ×DL 1 / 4 )≦5.85 (1)

[0017] According to the glass fiber reinforced resin composition of the present embodiment, the S, A, DS, DL and C are in the above-mentioned ranges, and the condition of formula (1) is satisfied, so that excellent strength and elastic modulus can be obtained when processed into a glass fiber reinforced resin molded product, and excellent processability can be obtained when manufacturing the glass fiber reinforced resin molded product. Here, having excellent strength means that the bending strength of the glass fiber reinforced resin molded product is 325 MPa or more. Also, having excellent elastic modulus means that the elastic modulus of the glass fiber reinforced resin molded product is 25 GPa or more.

[0018] When processed into a glass fiber reinforced resin molded product, excellent strength and elastic modulus can be obtained more reliably, and excellent processability can be more reliably achieved when manufacturing the glass fiber reinforced resin molded product. obtain In order to achieve this, the S is in the range of 48 to 70 mass %, the A is in the range of 9 to 30 mass %, the DS is in the range of 6.0 to 15.0 μm, and the major axis DL is 30.5 It is preferable that the particle size is in the range of 65.0 to 85.0 mass %, and that the S, A, DS, DL and C satisfy the following formula (4). 2.25≦(100×(A 2 / S)×(C / 100) 8 ) / (DS 3 / 4 ×DL 1 / 4 )≦4.90 (4)

[0019] The glass fiber reinforced resin composition of the present embodiment can obtain excellent strength and elastic modulus when processed into a glass fiber reinforced resin molded product, and can obtain particularly excellent processability when producing the glass fiber reinforced resin molded product. Therefore, it is more preferable that the S is in the range of 50 to 60 mass%, the A is in the range of 10 to 20 mass%, the DS is in the range of 7.5 to 13.0 μm, the DL is in the range of 30.5 to 48.0 μm, and the C is in the range of 70.5 to 82.5 mass%, and the S, A, DS, DL, and C satisfy the following formula (2). 2.27≦(100×(A 2 / S)×(C / 100) 8 ) / (DS3 / 4 ×DL 1 / 4 )≦4.30 (2)

[0020] The glass fiber reinforced resin composition of the present embodiment can obtain particularly excellent strength and excellent elastic modulus when processed into a glass fiber reinforced resin molded product, and can obtain particularly excellent processability when manufacturing the glass fiber reinforced resin molded product. In addition, it is more preferable that the S is in the range of 50 to 60 mass%, the A is in the range of 10 to 20 mass%, the DS is in the range of 7.5 to 13.0 μm, the DL is in the range of 30.5 to 48.0 μm, and the C is in the range of 70.5 to 82.5 mass%, and the S, A, DS, DL, and C satisfy the following formula (3). Here, having particularly excellent strength means that the bending strength of the glass fiber reinforced resin molded product is 340 MPa or more. Also, having excellent impact resistance means that the Charpy impact strength of the glass fiber reinforced resin molded product is 25 kJ / m 2 This means that it is more than or equal to this. 2.29≦(100×(A 2 / S)×(C / 100) 8 ) / (DS 3 / 4 ×DL 1 / 4 )≦3.37 (3)

[0021] The glass fiber reinforced resin composition of the present embodiment can more reliably obtain particularly excellent strength and excellent elastic modulus when processed into a glass fiber reinforced resin molded product, can more reliably obtain particularly excellent processability in producing the glass fiber reinforced resin molded product, and can more reliably obtain excellent impact resistance. Therefore, it is particularly preferable that S, A, DS, DL, and C satisfy the following formula (5). 2.30≦(100×(A 2 / S)×(C / 100) 8 ) / (DS 3 / 4 ×DL 1 / 4 )≦2.95 (5)

[0022] In the present invention, the bending strength, elastic modulus, and Charpy impact strength can be measured by the following methods. The apparatus used for the measurement is not particularly limited as long as it has the same performance as the apparatus described below.

[0023] [Bending strength] A static tensile test conforming to JIS K 7171:2016 is carried out on an A-type dumbbell test piece (thickness 4 mm) conforming to JIS K 7165:2008 using a precision universal testing machine (manufactured by Shimadzu Corporation, product name: Autograph AG-5000B) at a test temperature of 23°C to measure bending strength.

[0024] [Flexural modulus] The measurements are performed in accordance with JIS K7017:1999 (A method, class III test piece) using a precision universal testing machine (manufactured by Shimadzu Corporation, product name: Autograph AG-5000B).

[0025] [Charpy impact strength] The test piece is subjected to an unnotched Charpy impact test in accordance with ISO 179-1 using a digital impact tester (manufactured by Toyo Seiki Seisakusho, Ltd., model name: DG-UB type) at a test temperature of 23°C to measure the unnotched Charpy impact strength, which is defined as the Charpy impact strength.

[0026] In the glass fiber reinforced resin composition of this embodiment, if the short diameter DS of the glass fiber is less than 6.0 μm, the glass filaments constituting the glass fiber may be easily cut when producing thermoplastic resin pellets containing the glass fiber reinforced resin composition, and efficient production of thermoplastic resin pellets may not be possible. On the other hand, in the glass fiber reinforced resin composition of this embodiment, if the short diameter DS of the glass fiber is more than 15.0 μm, the surface area of ​​the glass fiber in a glass fiber reinforced resin molded product processed from the glass fiber reinforced resin composition of this embodiment may be reduced, and the glass fiber reinforced resin molded product may not have sufficient mechanical strength.

[0027] In the glass fiber reinforced resin composition of this embodiment, the long diameter DL of the glass fiber is 30.5 If the glass fiber has a major diameter DL of more than 50.0 μm, the glass fiber may have a reduced surface area in a glass fiber-reinforced resin molded product processed from the glass fiber-reinforced resin composition of the present embodiment, and the glass fiber-reinforced resin molded product may not have sufficient mechanical strength.

[0028] In the glass fiber reinforced resin composition of the present embodiment, from the viewpoint of ensuring flowability during injection molding, the minor axis DS of the glass fiber is preferably in the range of 7.5 to 13.0 μm, more preferably in the range of 8.0 to 12.0 μm, and even more preferably in the range of 8.5 to 11.5 μm. From the same viewpoint, the major axis DL of the glass fiber is preferably in the range of 30.5 to 48.0 μm, more preferably in the range of 33.0 to 46.5 μm, and even more preferably in the range of 35.0 to 45.0 μm.

[0029] The short diameter and long diameter of the glass fibers in the glass fiber reinforced resin composition of the present embodiment can be calculated, for example, by first polishing a cross section of a glass fiber reinforced resin molded product made of the glass fiber reinforced resin composition, and then measuring the lengths of 100 or more glass filaments using an electron microscope, with the longest side passing approximately at the center of the glass filament cross section being taken as the long diameter and the side perpendicular to the long diameter at approximately the center of the glass filament cross section being taken as the short diameter, and then calculating the average value of these lengths.

[0030] In addition, glass fibers are usually formed by bundling a plurality of glass filaments, but in the glass fiber reinforced resin molded product, the bundling is released through the molding process, and the glass filaments are present dispersedly in the glass fiber reinforced resin molded product.

[0031] In the glass fiber reinforced resin composition of this embodiment, the ratio of the long diameter DL to the short diameter DS of the glass fiber (DL / DS) is, for example, in the range of 1.2 to 10.0, preferably in the range of 1.8 to 8.0, more preferably in the range of 2.0 to 6.0, even more preferably in the range of 2.5 to 5.5, particularly preferably in the range of 3.0 to 5.0, and most preferably in the range of 3.3 to 4.5.

[0032] The glass fibers contained in the glass fiber reinforced resin composition of this embodiment have a flat cross-sectional shape, and examples of the flat cross-sectional shape include an oval shape (a shape in which the short sides of a rectangle are replaced with semicircles with the short sides as the diameters), an ellipse, and a rectangle, and an oval shape is preferred because it contributes to improving the fluidity of the glass fiber reinforced resin composition. Note that the cross section of the glass fiber means a cross section perpendicular to the fiber length direction of the glass fiber.

[0033] In the glass fiber reinforced resin composition of the present embodiment, the number average fiber length of the glass fibers can be in the range of 1 to 10,000 μm, but is preferably in the range of 250 to 500 μm, more preferably in the range of 300 to 450 μm, and even more preferably in the range of 325 to 425 μm.

[0034] The number average fiber length of the glass fibers in the glass fiber reinforced resin composition of the present embodiment can be calculated by the following method. First, a glass fiber reinforced resin molded product made of the glass fiber reinforced resin composition is heated in a muffle furnace at 650°C for 0.5 to 24 hours to decompose organic matter. Next, the remaining glass fibers are transferred to a glass petri dish, and the glass fibers are dispersed on the surface of the petri dish using acetone. Next, the fiber lengths of 1000 or more glass fibers dispersed on the surface of the petri dish are measured using a stereomicroscope, and the average is calculated to calculate the number average fiber length of the glass fibers.

[0035] In the glass fiber reinforced resin composition of the present embodiment, if the glass fiber content C is less than 65.0% by mass, a glass fiber reinforced resin molded article having excellent strength cannot be obtained. On the other hand, if the glass fiber content C is more than 85.0% by mass, the processability of producing the glass fiber reinforced resin molded article is deteriorated.

[0036] In the glass fiber reinforced resin composition of this embodiment, from the viewpoint of achieving both excellent strength and processability, the glass fiber content C is preferably in the range of 70.5 to 82.5 mass%, more preferably in the range of 72.0 to 80.0 mass%, and even more preferably in the range of 72.5 to 77.5 mass%.

[0037] The glass fiber content C in the glass fiber reinforced resin composition of the present embodiment can be calculated in accordance with JIS K 7052:1999.

[0038] In the glass fiber reinforced resin composition of the present embodiment, the glass composition of the glass forming the glass fibers is not particularly limited as long as the SiO2 content S is in the range of 48 to 70 mass% and the Al2O3 content A is in the range of 9 to 30 mass% relative to the total amount of glass fibers. In the glass composition, the SiO2 content S is preferably in the range of 50 to 60 mass%, more preferably in the range of 53 to 60 mass%, relative to the total amount of glass fibers. The Al2O3 content A is preferably in the range of 10 to 20 mass%, more preferably in the range of 12 to 19 mass%, for example.

[0039] In addition, in the glass composition, the content of MgO relative to the total amount of glass fibers is, for example, in the range of 0 to 15 mass%, preferably in the range of 0 to 12 mass%, more preferably in the range of 1 to 10 mass%, even more preferably in the range of 1 to 6 mass%, and particularly preferably in the range of 1 to 4 mass%.

[0040] In the glass composition, the CaO content relative to the total amount of the glass fibers is, for example, in the range of 0 to 30 mass%, preferably in the range of 2 to 27 mass%, more preferably in the range of 4 to 26 mass%, even more preferably in the range of 11 to 25 mass%, and particularly preferably in the range of 16 to 24 mass%.

[0041] In the glass composition, the content of B2O3 relative to the total amount of the glass fibers is, for example, in the range of 0 to 30 mass%, preferably in the range of 1 to 25 mass%, more preferably in the range of 1 to 10 mass%, further preferably in the range of 2 to 8 mass%, and particularly preferably in the range of 3 to 7 mass%.

[0042] In the glass composition, the total content of Li2O, Na2O, K2O and Fe2O3 relative to the total amount of the glass fibers is, for example, 0 to 2 mass %.

[0043] In the above glass composition, the total content of TiO2 and F2 relative to the total amount of the glass fibers is, for example, in the range of 0 to 5 mass %, and preferably in the range of 1 to 2 mass %.

[0044] In the glass fiber contained in the glass fiber reinforced resin composition of this embodiment, the content of each of the above-mentioned components can be measured using an ICP optical emission spectrometer for the light element Li, and using a wavelength dispersive X-ray fluorescence analyzer for the other elements.

[0045] The measurement method is as follows: first, a glass batch (mixed and prepared by mixing glass raw materials) or glass fiber (when organic matter is attached to the surface of the glass fiber or when the glass fiber is mainly contained as a reinforcing material in the organic matter (resin), for example, it is heated in a muffle furnace at 300 to 650 ° C for about 0.5 to 24 hours to remove the organic matter before use) is placed in a platinum crucible, and then melted while stirring in an electric furnace at a temperature of 1600 ° C for 6 hours to obtain a homogeneous molten glass. Next, the obtained molten glass is poured onto a carbon plate to prepare glass cullet, which is then crushed and powdered. For Li, which is a light element, the glass powder is thermally decomposed with acid, and then quantitatively analyzed using an ICP emission spectrometer. For other elements, the glass powder is molded into a disk shape using a press machine, and then quantitatively analyzed using a wavelength dispersive X-ray fluorescence analyzer. The results of these quantitative analyses are converted into oxides to calculate the content and total amount of each component, and the content (mass%) of each component described above can be obtained from these values.

[0046] The glass fiber having the above-mentioned glass composition is manufactured as follows. First, a glass raw material (glass batch) prepared to have the above-mentioned composition based on the components contained in the ore as the glass raw material, the content of each component, and the volatilization amount of each component during the melting process is supplied to a melting furnace and melted at a temperature in the range of, for example, 1450 to 1550 ° C. Next, the molten glass batch (molten glass) is drawn out from 1 to 30,000 nozzle tips of a bushing controlled at a predetermined temperature and quenched to form glass filaments. Next, a sizing agent or binder is applied to the formed glass filaments using an applicator, which is an application device, and 1 to 30,000 glass filaments are bundled using a bundling shoe, and the glass filaments are wound at high speed around a tube using a winding machine to obtain glass fibers. Here, the nozzle tip has a non-circular shape and has a protrusion or a notch for quenching the molten glass, and the temperature conditions are controlled to obtain glass filaments having a flat cross-sectional shape. In addition, the minor diameter DS (μm) and major diameter DL (μm) of the glass fiber can be adjusted by adjusting the nozzle tip diameter, the winding speed, the temperature conditions, etc. For example, the minor diameter DS and major diameter DL can be made smaller by increasing the winding speed, and the minor diameter DS and major diameter DL can be made larger by decreasing the winding speed.

[0047] In the glass fiber reinforced resin composition of this embodiment, the surface of the glass fiber may be coated with an organic substance for the purpose of improving the adhesion between the glass fiber and the resin, improving the uniform dispersion of the glass fiber in a mixture of the glass fiber and the resin or the inorganic material, etc. Examples of such organic substances include urethane resin, epoxy resin, vinyl acetate resin, acrylic resin, modified polypropylene (particularly, carboxylic acid modified polypropylene), and copolymers of (poly)carboxylic acid (particularly, maleic acid) and unsaturated monomers.

[0048] In the glass fiber reinforced resin composition of the present embodiment, the glass fiber may be coated with a resin composition containing a silane coupling agent, a lubricant, a surfactant, etc. in addition to these resins. Such a resin composition coats the glass fiber at a ratio of 0.1 to 2.0 mass% based on the mass of the glass fiber in a state where it is not coated with the resin composition. The coating of the glass fiber with an organic substance can be performed, for example, in the glass fiber manufacturing process, by applying the sizing agent or binder containing the resin solution or the resin composition solution to the glass fiber using a known method such as a roller type applicator, and then drying the glass fiber to which the resin solution or the resin composition solution has been applied.

[0049] Examples of the silane coupling agent include aminosilanes (γ-aminopropyltriethoxysilane, N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, N-β-(aminoethyl)-N'-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, γ-anilinopropyltrimethoxysilane, etc.), chlorosilanes (γ-chloropropyltrimethoxysilane, etc.), epoxysilanes (γ-glycidoxypropyltrimethoxysilane, β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, etc.), and the like. Examples of the silane coupling agent include silanes such as silanes (γ-mercaptotrimethoxysilane, etc.), vinylsilanes (vinyltrimethoxysilane, N-β-(N-vinylbenzylaminoethyl)-γ-aminopropyltrimethoxysilane, etc.), (meth)acrylsilanes (γ-methacryloxypropyltrimethoxysilane, etc.), and cationic silanes (N-(vinylbenzyl)-2-aminoethyl-3-aminopropyltrimethoxysilane hydrochloride, N-phenyl-3-aminopropyltrimethoxysilane hydrochloride, etc.). The silane coupling agent may be used alone or in combination of two or more of these compounds.

[0050] Examples of lubricants include modified silicone oil, animal oil (beef tallow, etc.) and its hydrogenated products, vegetable oil (soybean oil, coconut oil, rapeseed oil, palm oil, castor oil, etc.) and its hydrogenated products, animal wax (beeswax, lanolin, etc.), vegetable wax (candelilla wax, carnauba wax, etc.), mineral wax (paraffin wax, montan wax, etc.), condensation products of higher saturated fatty acids and higher saturated alcohols (stearic acid esters such as lauryl stearate, etc.), polyethyleneimine, polyalkylpolyamine alkylamide derivatives, fatty acid amides (for example, dehydration condensation products of polyethylene polyamines such as diethylenetriamine, triethylenetetramine, tetraethylenepentamine, etc., and fatty acids such as lauric acid, myristic acid, palmitic acid, stearic acid, etc.), and quaternary ammonium salts (alkyl trimethyl ammonium salts such as lauryl trimethyl ammonium chloride, etc.). The lubricants can be used alone or in combination of two or more types.

[0051] Examples of the surfactant include nonionic surfactants, cationic surfactants, anionic surfactants, and amphoteric surfactants. The surfactants may be used alone or in combination of two or more kinds.

[0052] Examples of nonionic surfactants include ethylene oxide propylene oxide alkyl ethers, polyoxyethylene alkyl ethers, polyoxyethylene-polyoxypropylene block copolymers, alkyl polyoxyethylene-polyoxypropylene block copolymer ethers, polyoxyethylene fatty acid esters, polyoxyethylene fatty acid monoesters, polyoxyethylene fatty acid diesters, polyoxyethylene sorbitan fatty acid esters, glycerol fatty acid ester ethylene oxide adducts, polyoxyethylene castor oil ethers, hydrogenated castor oil ethylene oxide adducts, alkylamine ethylene oxide adducts, fatty acid amide ethylene oxide adducts, glycerol fatty acid esters, polyglycerin fatty acid esters, pentaerythritol fatty acid esters, sorbitol fatty acid esters, sorbitan fatty acid esters, sucrose fatty acid esters, polyhydric alcohol alkyl ethers, fatty acid alkanolamides, acetylene glycol, acetylene alcohol, ethylene oxide adducts of acetylene glycol, and ethylene oxide adducts of acetylene alcohol.

[0053] Examples of cationic surfactants include alkyl dimethyl benzyl ammonium chloride, alkyl trimethyl ammonium chloride, alkyl dimethyl ethyl ammonium ethyl sulfate, higher alkyl amine salts (acetates, hydrochlorides, etc.), ethylene oxide adducts of higher alkyl amines, condensates of higher fatty acids and polyalkylene polyamines, salts of esters of higher fatty acids and alkanolamines, salts of higher fatty acid amides, imidazoline-type cationic surfactants, and alkyl pyridinium salts.

[0054] Examples of anionic surfactants include higher alcohol sulfates, higher alkyl ether sulfates, α-olefin sulfates, alkylbenzene sulfonates, α-olefin sulfonates, reaction products of fatty acid halides and N-methyltaurine, dialkyl sulfosuccinates, higher alcohol phosphates, and phosphate salts of higher alcohol ethylene oxide adducts.

[0055] Examples of the amphoteric surfactant include amino acid type amphoteric surfactants such as alkali metal salts of alkylaminopropionic acid, betaine type such as alkyldimethylbetaine, and imidazoline type amphoteric surfactants.

[0056] The glass fiber reinforced resin composition of the present embodiment contains, in addition to the above-mentioned glass fibers, a thermoplastic resin or a thermosetting resin, and additives other than the glass fibers. In the glass fiber reinforced resin composition of the present embodiment, the content of the thermoplastic resin or the thermosetting resin is, for example, in the range of 20.0 mass% or more and less than 50.0 mass% based on the total amount of the glass fiber reinforced resin composition. In addition, in the glass fiber reinforced resin composition of the present embodiment, the content of the additives other than the glass fibers is, for example, in the range of 0 to 25.0 mass% based on the total amount of the glass fiber reinforced resin composition.

[0057] Examples of the thermoplastic resin include polyethylene, polypropylene, polystyrene, styrene / maleic anhydride resin, styrene / maleimide resin, polyacrylonitrile, acrylonitrile / styrene (AS) resin, acrylonitrile / butadiene / styrene (ABS) resin, chlorinated polyethylene / acrylonitrile / styrene (ACS) resin, acrylonitrile / ethylene / styrene (AES) resin, acrylonitrile / styrene / methyl acrylate (ASA) resin, styrene / acrylonitrile (SAN) resin, methacrylic resin, polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), polyamide, polyacetal, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polycarbonate, ester, polyarylene sulfide, polyethersulfone (PES), polyphenylsulfone (PPSU), polyphenylene ether (PPE), modified polyphenylene ether (m-PPE), polyaryletherketone, liquid crystal polymer (LCP), fluororesin, polyetherimide (PEI), polyarylate (PAR), polysulfone (PSF), polyamideimide (PAI), polyaminobismaleimide (PABM), thermoplastic polyimide (TPI), polyethylene naphthalate (PEN), ethylene / vinyl acetate (EVA) resin, ionomer (IO) resin, polybutadiene, styrene / butadiene resin, polybutylene, polymethylpentene, olefin / vinyl alcohol resin, cyclic olefin resin, cellulose resin, polylactic acid, and the like.

[0058] Specifically, examples of polyethylene include high density polyethylene (HDPE), medium density polyethylene, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), and ultra-high molecular weight polyethylene.

[0059] Examples of polypropylene include isotactic polypropylene, atactic polypropylene, syndiotactic polypropylene, and mixtures thereof.

[0060] Examples of polystyrene include general-purpose polystyrene (GPPS), which is an atactic polystyrene having an atactic structure, high impact polystyrene (HIPS), which is GPPS with a rubber component added, and syndiotactic polystyrene having a syndiotactic structure.

[0061] Examples of the methacrylic resin include a homopolymer of one of acrylic acid, methacrylic acid, styrene, methyl acrylate, ethyl acrylate, ethyl methacrylate, butyl acrylate, butyl methacrylate, and a fatty acid vinyl ester, or a copolymer of two or more of them.

[0062] Examples of polyvinyl chloride include vinyl chloride homopolymers polymerized by conventional methods such as emulsion polymerization, suspension polymerization, microsuspension polymerization, and bulk polymerization; copolymers of vinyl chloride monomers with monomers copolymerizable therewith; and graft copolymers in which vinyl chloride monomers are graft-polymerized onto a polymer.

[0063] Polyamides include polycaproamide (nylon 6), polyhexamethylene adipamide (nylon 66), polytetramethylene adipamide (nylon 46), polytetramethylene sebacamide (nylon 410), polypentamethylene adipamide (nylon 56), polypentamethylene sebacamide (nylon 510), polyhexamethylene sebacamide (nylon 610), polyhexamethylene dodecamide (nylon 612), polydecamethylene adipamide (nylon 106), polydecamethylene Poly(Nylon 1010), Poly(decamethylene dodecamide) (Nylon 1012), Poly(undecane amide) (Nylon 11), Poly(undecamethylene adipamide) (Nylon 116), Poly(dodecanamide) (Nylon 12), Poly(xylylene adipamide) (Nylon XD6), Poly(xylylene sebacamide) (Nylon XDS0), Poly(meta-xylylene adipamide) (Nylon MXD6), Poly(para-xylylene adipamide) (Nylon PXD6), Poly(tetramethylene terephthalamide) (Nylon 4 T), polypentamethylene terephthalamide (nylon 5T), polyhexamethylene terephthalamide (nylon 6T), polyhexamethylene isophthalamide (nylon 6I), polynonamethylene terephthalamide (nylon 9T), polydecamethylene terephthalamide (nylon 10T), polyundecamethylene terephthalamide (nylon 11T), polydodecamethylene terephthalamide (nylon 12T), polytetramethylene isophthalamide (nylon 4I), polybis(3- Examples of the polymerizable compound include polybis(3-methyl-4-aminohexyl)methane terephthalamide (nylon PACMT), polybis(3-methyl-4-aminohexyl)methane isophthalamide (nylon PACMI), polybis(3-methyl-4-aminohexyl)methanendodecamide (nylon PACM12), polybis(3-methyl-4-aminohexyl)methane tetradecamide (nylon PACM14), and copolymers or mixtures thereof made of one or more of these components.

[0064] Examples of polyacetals include homopolymers having oxymethylene units as the main repeating units, and copolymers mainly composed of oxymethylene units and containing oxyalkylene units having 2 to 8 adjacent carbon atoms in the main chain.

[0065] Examples of polyethylene terephthalate include a polymer obtained by polycondensing terephthalic acid or a derivative thereof with ethylene glycol.

[0066] Examples of polybutylene terephthalate include a polymer obtained by polycondensation of terephthalic acid or a derivative thereof with 1,4-butanediol.

[0067] Examples of polytrimethylene terephthalate include polymers obtained by polycondensation of terephthalic acid or a derivative thereof with 1,3-propanediol.

[0068] Examples of polycarbonates include polymers obtained by a transesterification method in which a dihydroxydiaryl compound is reacted with a carbonate ester such as diphenyl carbonate in a molten state, and polymers obtained by a phosgene method in which a dihydroxyaryl compound is reacted with phosgene.

[0069] Examples of polyarylene sulfide include linear polyphenylene sulfide, crosslinked polyphenylene sulfide which has been polymerized and then cured, polyphenylene sulfide sulfone, polyphenylene sulfide ether, and polyphenylene sulfide ketone.

[0070] Examples of polyphenylene ether include poly(2,3-dimethyl-6-ethyl-1,4-phenylene ether), poly(2-methyl-6-chloromethyl-1,4-phenylene ether), poly(2-methyl-6-hydroxyethyl-1,4-phenylene ether), poly(2-methyl-6-n-butyl-1,4-phenylene ether), poly(2-ethyl-6-isopropyl-1,4-phenylene ether), poly(2-ethyl-6-n-propyl-1,4-phenylene ether), poly(2,3,6-trimethyl-1,4-phenylene ether), poly[2-(4'-methylphenyl)-1,4-phenylene ether], poly(2-bromo-6-phenyl-1,4-phenylene ether), poly(2-methyl-6-phenyl-1,4-phenylene ether), poly(2-phenyl-1,4-phenylene ether), poly(2-chloro-1,4-phenylene ether), poly(2-methyl-1,4-phenylene ether), poly(2-chloro-6-ethyl-1,4-phenylene ether), poly(2-chloro-6-bromo-1,4-phenylene ether), poly(2,6-di-n-propyl-1,4-phenylene ether), poly(2-methyl-6-isopropyl-1,4-phenylene ether), poly(2-chloro-6-methyl-1,4-phenylene ether), poly(2-methyl-6-ethyl-1,4-phenylene ether), poly(2,6-dibromo-1,4-phenylene ether), poly(2,6-dichloro-1,4-phenylene ether), poly(2,6-diethyl-1,4-phenylene ether), poly(2,6-dimethyl-1,4-phenylene ether), and the like.

[0071] Examples of modified polyphenylene ethers include a polymer alloy of poly(2,6-dimethyl-1,4-phenylene) ether and polystyrene, a polymer alloy of poly(2,6-dimethyl-1,4-phenylene) ether and a styrene / butadiene copolymer, a polymer alloy of poly(2,6-dimethyl-1,4-phenylene) ether and a styrene / maleic anhydride copolymer, a polymer alloy of poly(2,6-dimethyl-1,4-phenylene) ether and a polyamide, a polymer alloy of poly(2,6-dimethyl-1,4-phenylene) ether and a styrene / butadiene / acrylonitrile copolymer, the polyphenylene ether having a functional group such as an amino group, an epoxy group, a carboxy group, or a styryl group introduced at the polymer chain end, and the polyphenylene ether having a functional group such as an amine group, an epoxy group, a carboxy group, a styryl group, or a methacryl group introduced at the polymer chain side chain.

[0072] Examples of polyaryletherketones include polyetherketone (PEK), polyetheretherketone (PEEK), polyetherketoneketone (PEKK), and polyetheretherketoneketone (PEEKK).

[0073] Examples of liquid crystal polymers (LCPs) include thermotropic liquid crystal polyesters, such as (co)polymers composed of one or more structural units selected from aromatic hydroxycarbonyl units, aromatic dihydroxy units, aromatic dicarbonyl units, aliphatic dihydroxy units, aliphatic dicarbonyl units, and the like.

[0074] Examples of fluororesins include polytetrafluoroethylene (PTFE), perfluoroalkoxy resin (PFA), fluorinated ethylene propylene resin (FEP), fluorinated ethylene tetrafluoroethylene resin (ETFE), polyvinyl fluoride (PVF), polyvinylidene fluoride (PVDF), polychlorotrifluoroethylene (PCTFE), and ethylene / chlorotrifluoroethylene resin (ECTFE).

[0075] Examples of ionomer (IO) resins include copolymers of olefin or styrene with unsaturated carboxylic acid, in which a portion of the carboxyl groups is neutralized with metal ions.

[0076] Examples of the olefin / vinyl alcohol resin include an ethylene / vinyl alcohol copolymer, a propylene / vinyl alcohol copolymer, a saponified ethylene / vinyl acetate copolymer, and a saponified propylene / vinyl acetate copolymer.

[0077] Examples of the cyclic olefin resin include monocyclic compounds such as cyclohexene, polycyclic compounds such as tetracyclopentadiene, and polymers of cyclic olefin monomers.

[0078] Examples of polylactic acid include poly-L-lactic acid, which is a homopolymer of the L-form, poly-D-lactic acid, which is a homopolymer of the D-form, and stereocomplex polylactic acid, which is a mixture thereof.

[0079] Examples of the cellulose resin include methyl cellulose, ethyl cellulose, hydroxy cellulose, hydroxy methyl cellulose, hydroxy ethyl cellulose, hydroxy ethyl methyl cellulose, hydroxy propyl methyl cellulose, cellulose acetate, cellulose propionate, and cellulose butyrate.

[0080] Examples of the thermosetting resin include unsaturated polyester resin, vinyl ester resin, epoxy (EP) resin, melamine (MF) resin, phenolic resin (PF), urethane resin (PU), polyisocyanate, polyisocyanurate, polyimide (PI), urea (UF) resin, silicone (SI) resin, furan (FR) resin, benzoguanamine (BR) resin, alkyd resin, xylene resin, bismaleimide triazine (BT) resin, and diallyl phthalate resin (PDAP).

[0081] Specifically, the unsaturated polyester may be a resin obtained by subjecting an aliphatic unsaturated dicarboxylic acid to an esterification reaction with an aliphatic diol.

[0082] Examples of the vinyl ester resin include bis-based vinyl ester resins and novolac-based vinyl ester resins.

[0083] Epoxy resins include bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol E type epoxy resin, bisphenol S type epoxy resin, bisphenol M type epoxy resin (4,4'-(1,3-phenylenediisopropylidene)bisphenol type epoxy resin), bisphenol P type epoxy resin (4,4'-(1,4-phenylenediisopropylidene)bisphenol type epoxy resin), bisphenol Z type epoxy resin (4,4'-cyclohexylidenebisphenol type epoxy resin), phenol novolac type epoxy resin, cresol novolac type epoxy resin, tetraphenol group ethane novolac type epoxy resin, etc. Examples of epoxy resins include novolac-type epoxy resins having a condensed ring aromatic hydrocarbon structure, biphenyl-type epoxy resins, aralkyl-type epoxy resins such as xylylene-type epoxy resins and phenylaralkyl-type epoxy resins, naphthylene ether-type epoxy resins, naphthol-type epoxy resins, naphthalene diol-type epoxy resins, difunctional to tetrafunctional epoxy-type naphthalene resins, binaphthyl-type epoxy resins, naphthalene aralkyl-type epoxy resins, anthracene-type epoxy resins, phenoxy-type epoxy resins, dicyclopentadiene-type epoxy resins, norbornene-type epoxy resins, adamantane-type epoxy resins, and fluorene-type epoxy resins.

[0084] The melamine resin may be a polymer obtained by polycondensation of melamine (2,4,6-triamino-1,3,5-triazine) and formaldehyde.

[0085] Examples of the phenol resin include novolac-type phenol resins such as phenol novolac resin, cresol novolac resin, and bisphenol A-type novolac resin; resole-type phenol resins such as methylol-type resole resin and dimethylene ether-type resole resin; and aryl alkylene-type phenol resins; and the like. One or a combination of two or more of these may be used.

[0086] Urea resins include resins obtained by condensation of urea and formaldehyde.

[0087] The thermoplastic resins or thermosetting resins may be used alone or in combination of two or more kinds.

[0088] The resin used in the glass fiber reinforced resin composition of the present embodiment is preferably a thermoplastic resin, more preferably a thermoplastic resin for injection molding, because it enables efficient production of large glass fiber reinforced resin molded products, and is further preferably a resin selected from the group consisting of polyamide resin, polybutylene terephthalate resin, polycarbonate resin, polyarylene sulfide resin, polyaryl ketone resin, and liquid crystal polymer (LCP), and is particularly preferably a polyamide resin.

[0089] Examples of additives other than glass fiber include reinforcing fibers other than glass fiber (e.g., carbon fiber, metal fiber, etc.), fillers other than glass fiber (e.g., glass powder, talc, mica, etc.), flame retardants, ultraviolet absorbers, heat stabilizers, antioxidants, antistatic agents, flow improvers, antiblocking agents, lubricants, nucleating agents, antibacterial agents, pigments, etc.

[0090] The glass fiber reinforced resin molded product of this embodiment is a mixture of the above-mentioned glass fiber reinforced resin composition and additives other than the above-mentioned glass fibers, and is molded by a molding method appropriately selected from known molding methods such as injection molding, injection compression molding, two-color molding, hollow molding, foam molding (including supercritical fluid foam molding), insert molding, in-mold coating molding, extrusion molding, sheet molding, thermoforming, rotational molding, lamination molding, press molding, blow molding, stamping molding, infusion, hand layup, spray-up, resin transfer molding, sheet molding compound method, bulk molding compound method, pultrusion method, and filament winding method according to the characteristics of the resin and additives and the application of the glass fiber reinforced resin molded product. It can be obtained by molding.

[0091] The glass fiber reinforced resin molded product of the present embodiment is preferably a glass fiber reinforced resin injection molded product obtained by injection molding. Since injection molding has a superior molding cycle compared to other molding methods, it is suitable for efficient production of large glass fiber reinforced resin molded products.

[0092] Among these, the injection molding method using thermoplastic resin pellets containing the glass fiber reinforced resin composition of this embodiment is preferably adopted. In this case, as the glass fiber in the glass fiber reinforced resin composition of this embodiment to be contained in the thermoplastic resin pellets, a chopped strand obtained by cutting a glass fiber (also called a glass fiber bundle or glass strand) having a number (bundle number) of glass filaments constituting the glass fiber preferably of 1 to 20,000, more preferably of 50 to 10,000, and even more preferably of 1,000 to 8,000 to a length of preferably 1.0 to 30.0 mm, more preferably of 2.0 to 15.0 mm, and even more preferably of 2.3 to 7.8 mm, or a cut fiber obtained by pulverizing the glass fiber by a known method such as a ball mill or a Henschel mixer to a length of preferably 0.001 to 0.900 mm, more preferably of 0.010 to 0.700 mm, and even more preferably of 0.020 to 0.500 mm can be used. In addition to chopped strands and cut fibers, the glass fiber may be in the form of a roving, which is made up of 10 to 30,000 glass filaments that are not cut and has a weight of, for example, 20 to 10,000 tex (g / km).

[0093] The method for producing thermoplastic resin pellets containing the glass fiber reinforced resin composition of the present embodiment is not particularly limited, but for example, the chopped strands and the thermoplastic resin as described above can be melt-kneaded and extruded using a twin-screw kneader or the like under known kneading conditions suited to the thermoplastic resin used. Then, the thermoplastic resin pellets can be injection molded using an injection molding machine under known injection molding conditions suited to the thermoplastic resin used to obtain a glass fiber reinforced resin molded product.

[0094] The number average fiber length (μm) of the glass fibers contained in the glass fiber reinforced resin molded product can be adjusted by the length of the chopped strands contained in the thermoplastic resin pellets, the kneading conditions from pellet preparation to injection molding, and the injection molding conditions. For example, the number average fiber length (μm) of the glass fibers contained in the glass fiber reinforced resin molded product can be increased by increasing the length of the chopped strands fed into the twin-screw kneader in the range of 1.0 to 100.0 mm, and can be shortened by shortening the length of the chopped strands. In addition, the number average fiber length (μm) of the glass fibers contained in the glass fiber reinforced resin molded product can be increased by lowering the screw rotation speed during twin-screw kneading in the range of 10 to 1000 rpm in the thermoplastic resin pellet manufacturing process, and can be shortened by increasing the screw rotation speed during twin-screw kneading.

[0095] The glass fiber reinforced resin molded product of the present embodiment can be used as a substitute for metal in automobiles, but is not limited thereto. The glass fiber reinforced resin molded product of the present embodiment can be used, for example, for vehicle exterior parts (bumpers, fenders, bonnets, air dams, wheel covers, door mirror stays, etc.), vehicle interior parts (door trims, ceiling materials, combination switches, etc.), vehicle engine peripheral parts (cylinder head covers, oil pans, engine covers, intake manifolds, intake air ducts, air pipes, cooling fans, chain guides, tensioners, engine mount orifices, impellers, air flow meters, ignition coil covers, actuator cases, quick connectors, exhaust manifolds, etc.), vehicle electrical parts, vehicle mechanism parts (pedal modules, shift lever bases, pulleys, seal rings, gears, bearings), vehicle muffler parts (sound deadening parts, etc.), electronic device housings, other electronic parts (connectors, sockets, LEDs, sealed molded products), and high pressure tanks.

[0096] Next, examples of the present invention and comparative examples will be described. EXAMPLES

[0097] [Examples 1 to 4 and Comparative Examples 1 to 5] First, glass chopped strands having a length of 3 mm and having a glass composition of either composition A (Examples 1 to 4 and Comparative Examples 1 to 3) or composition B (Comparative Examples 4 to 5) shown in Table 1 were kneaded with polyamide resin PA6 (manufactured by Ube Industries, Ltd., product name: UBE Nylon 1015B) at a screw rotation speed of 100 rpm in a twin-screw kneader (manufactured by Toshiba Machine Co., Ltd., product name: TEM-26SS) to produce thermoplastic resin pellets of the glass fiber reinforced resin composition of Examples 1 to 4 and Comparative Examples 1 to 5.

[0098] [Table 1]

[0099] The SiO2 content S relative to the total amount of glass fibers, the Al2O3 content A relative to the total amount of glass fibers, the cross-sectional shape of the glass fibers, the short diameter DS, the long diameter DL, the glass fiber content C of the glass fiber reinforced resin composition, (100×(A 2 / S)×(C / 100) 8 ) / (DS 3 / 4 ×DL 1 / 4 The values ​​of (100×(A)) are shown in Table 2. In addition, the SiO2 content S relative to the total amount of glass fibers, the Al2O3 content A relative to the total amount of glass fibers, the cross-sectional shape of the glass fibers, the short diameter DS, the long diameter DL, the glass fiber content C of the glass fiber reinforced resin composition, and (100×(A)) are shown in Table 2. 2 / S)×(C / 100) 8 ) / (DS 3 / 4 ×DL 1 / 4 ) values ​​are shown in Table 3.

[0100] Next, the obtained thermoplastic resin pellets were injection molded with an injection molding machine (manufactured by Nissei Plastic Industrial Co., Ltd., product name: NEX80) at a mold temperature of 90°C and an injection temperature of 270°C to prepare A-type dumbbell test pieces (thickness 4 mm) in accordance with JIS K 7165:2008 as test pieces for measuring bending strength and Charpy impact strength. Also, the obtained thermoplastic resin pellets were injection molded with an injection molding machine (manufactured by Nissei Plastic Industrial Co., Ltd., product name: NEX80) to prepare A-method class III test pieces in accordance with JIS K7017:1999 as test pieces for measuring bending elastic modulus.

[0101] Next, the bending strength, bending modulus, and Charpy impact strength were measured for each of the test pieces by the above-mentioned methods. The results are shown in Tables 2 and 3.

[0102] The processability in the injection molding was evaluated according to the following A to D. The results are shown in Tables 2 and 3.

[0103] A: It can be injection molded without any problems.

[0104] B: The part can be injection molded without any problems, but there may be some bridging or the injection pressure may be relatively high.

[0105] C: Bridges occur during injection molding, which makes workability worse. Also, the injection pressure is high, which causes significant damage to the mold.

[0106] D: Injection molding is not possible.

[0107] [Table 2]

[0108] [Table 3]

[0109] From Table 2, in the glass fibers contained in the glass fiber reinforced resin composition, the SiO2 content S relative to the total amount of glass fibers is 54 mass%, the Al2O3 content A relative to the total amount of glass fibers is 14 mass%, the glass fibers have a short diameter DS in the range of 9 to 11.0 μm and a long diameter DL in the range of 36.0 to 44.0 μm, and have an oval and flat cross-sectional shape, the glass fiber content C in the glass fiber reinforced resin composition is in the range of 75.0 to 80.0 mass%, and (100 × (A 2 / S)×(C / 100) 8 ) / (DS 3 / 4 ×DL 1 / 4 According to the glass fiber reinforced resin compositions of Examples 1 to 4, in which the value of 2.34 to 4.78 is in the range, the bending strength of the glass fiber reinforced resin molded product obtained by the injection molding is in the range of 330 to 365 MPa, the bending modulus of elasticity is in the range of 26 to 28 GPa, and the strength and elastic modulus when processed into a glass fiber reinforced resin molded product are excellent. In addition, the processability is evaluated as A or B, and it is clear that the processability when producing a glass fiber reinforced resin molded product is excellent.

[0110] On the other hand, from Table 3, in the glass fibers contained in the glass fiber reinforced resin composition, the SiO2 content S relative to the total amount of glass fibers is 54 mass%, the Al2O3 content A relative to the total amount of glass fibers is 14 mass%, and the glass fibers have a flat cross-sectional shape that is an ellipse with a short diameter DS of 7.0 μm and a long diameter DL of 28.00 μm, but the glass fiber content C in the glass fiber reinforced resin composition is 80.0 mass%, and (100 × (A 2 / S)×(C / 100) 8 ) / (DS 3 / 4 ×DL 1 / 4 The glass fiber reinforced resin composition of Comparative Example 1, in which the value of ) was 6.15, was evaluated as D for processability, and a glass fiber reinforced resin molded article could not be produced. This clearly shows that the processability for producing a glass fiber reinforced resin molded article is poor.

[0111] In addition, from Table 3, in the glass fibers contained in the glass fiber reinforced resin composition, the SiO2 content S relative to the total amount of glass fibers is 54 mass%, the Al2O3 content A relative to the total amount of glass fibers is 14 mass%, the glass fibers have a flat cross-sectional shape that is an ellipse with a short diameter DS of 7.0 μm and a long diameter DL of 28.0 μm, and the glass fiber content C in the glass fiber reinforced resin composition is 70.0 mass%, but (100 × (A 2 / S)×(C / 100) 8 ) / (DS 3 / 4 ×DL 1 / 4 In the case of the glass fiber reinforced resin composition of Comparative Example 2, in which the value of (A) is 2.11, the flexural modulus of the glass fiber reinforced resin molded product obtained by the injection molding is 24 GPa, and it is clear that a sufficient flexural modulus cannot be obtained in the glass fiber reinforced resin molded product.

[0112] In addition, from Table 3, in the glass fibers contained in the glass fiber reinforced resin composition, the SiO2 content S relative to the total amount of glass fibers is 54 mass%, the Al2O3 content A relative to the total amount of glass fibers is 14 mass%, and the glass fiber content C in the glass fiber reinforced resin composition is 70.0 mass%, but the glass fibers have a circular cross-sectional shape with a short diameter DS and a long diameter DL of 11.0 μm. According to the glass fiber reinforced resin composition of Comparative Example 3, (100×(A 2 / S)×(C / 100) 8 ) / (DS 3 / 4 ×DL 1 / 4 ) was 1.90, and the flexural modulus of the glass fiber reinforced resin molded product obtained by the injection molding was 24 GPa, which shows that a sufficient flexural modulus cannot be obtained in the glass fiber reinforced resin molded product.

[0113] In addition, from Table 3, in the glass fibers contained in the glass fiber reinforced resin composition, the SiO2 content S relative to the total amount of glass fibers is 65 mass%, the Al2O3 content A relative to the total amount of glass fibers is 25 mass%, and the glass fiber content C in the glass fiber reinforced resin composition is 72.0 mass%, but the glass fibers have a circular cross-sectional shape with a short diameter DS and a long diameter DL of 11.0 μm. According to the glass fiber reinforced resin composition of Comparative Example 4, (100×(A 2 / S)×(C / 100) 8 ) / (DS 3 / 4 ×DL 1 / 4 ) was 6.31, and the processability was rated C, which clearly indicates that the processability for producing glass fiber reinforced resin molded products is poor.

[0114] In addition, from Table 3, in the glass fibers contained in the glass fiber reinforced resin composition, the SiO2 content S relative to the total amount of glass fibers is 65 mass%, and the Al2O3 content A relative to the total amount of glass fibers is 25 mass%, but the glass fiber content C in the glass fiber reinforced resin composition is 50.0 mass%, and the glass fibers have a circular cross-sectional shape with a short diameter DS and a long diameter DL of 7.0 μm. According to the glass fiber reinforced resin composition of Comparative Example 5, (100×(A 2 / S)×(C / 100) 8 ) / (DS 3 / 4 ×DL 1 / 4 ) was 0.54, and the flexural modulus of the glass fiber reinforced resin molded product obtained by the injection molding was 16.5 GPa, which shows that a sufficient flexural modulus cannot be obtained in the glass fiber reinforced resin molded product.

Claims

1. A glass fiber reinforced resin composition, The glass fiber reinforced resin composition contains a polyamide resin, The SiO ratio relative to the total amount of glass fibers in the glass fiber reinforced resin composition ２ The content S is in the range of 48 to 70 mass %, The amount of Al relative to the total amount of glass fibers in the glass fibers contained in the glass fiber reinforced resin composition ２ O ３ The content A is in the range of 9 to 30 mass %, The glass fiber has a flat cross-sectional shape with a short diameter DS in the range of 6.0 to 15.0 μm and a long diameter DL in the range of 30.5 to 50.0 μm, The glass fiber content C in the glass fiber reinforced resin composition is in the range of 65.0 to 85.0 mass%, A glass fiber reinforced resin composition, characterized in that S, A, DS, DL and C satisfy the following formula (1). 2.24≦(100×(A ２ / S)×(C / 100) ８ ) / (DS ３／４ ×DL １／４ )≦5.85 ・・・(1)

2. In the glass fiber reinforced resin composition according to claim 1, the S is in the range of 50 to 60 mass%, the A is in the range of 10 to 20 mass%, the DS is in the range of 7.5 to 13.0 μm, the DL is in the range of 30.5 to 48.0 μm, and the C is in the range of 70.5 to 82.5 mass%, A glass fiber characterized in that the S, A, DS, DL and C satisfy the following formula (2). Reinforced resin composition. 2.27≦((100×(A ２ / S)×(C / 100) ８ ) / (DS ３／４ ×DL １／４ )≦4.30 ・・・(2)

3. The glass fiber reinforced resin composition according to claim 2, A glass fiber reinforced resin composition, characterized in that S, A, DS, DL and C satisfy the following formula (3). 2.29≦(100×(A ２ / S)×(C / 100) ８ ) / (DS ３／４ ×DL １／４ )≦3.37 ・・・(3)

4. A glass fiber reinforced resin molded product comprising the glass fiber reinforced resin composition according to any one of claims 1 to 3.

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