Polyarylene sulfide resin composition and molded body thereof, method for producing polyarylene sulfide resin composition, and method for producing molded body

Abstract

Provided are a polyarylene sulfide resin composition that is a raw material for a molded body that is excellent in cold and hot impact resistance and a molded body of the polyarylene sulfide resin composition that is excellent in mechanical strength of a welded portion and bending flexibility in the TD direction, a production method for the polyarylene sulfide resin composition, and a production method for the molded body. In further detail, provided are a polyarylene sulfide resin composition and a molded product and a production method therefor, the polyarylene sulfide resin composition containing: a polyarylene sulfide resin (A), an olefin-based polymer (B), a zeolite (C), glass fibers (D1), and glass flake (D2), the glass flake (D2) having a weight average particle diameter in the range of 100 μm or less.

Description

Technical Field

[0001] This invention relates to: a resin composition containing a polyarylene sulfide resin (hereinafter referred to as a polyarylene sulfide resin composition), a molded body formed from the polyarylene sulfide resin composition, a method for manufacturing the polyarylene sulfide resin composition, and a method for manufacturing the molded body. Background Technology

[0002] Polyaryl sulfide (PAS) resins, represented by polyphenylene sulfide (PPS), are known as engineering plastics that can maintain a melting point above 270°C and exhibit excellent heat resistance. However, they are generally known to have poorer toughness compared to other engineering plastics, and there is room for improvement in terms of molding flowability and thermal shock resistance, considering the intended use and shape of the final product.

[0003] For example, Patent Document 1 below describes a technique for improving low gas content and thermal properties of injection molded articles by means of a resin composition, wherein the resin composition contains: polyphenylene sulfide resin, glass flakes as an inorganic filler and inorganic fillers other than glass flakes, and an olefin polymer, wherein the mixing amount of glass flakes and inorganic fillers other than glass flakes is within a constant range.

[0004] In addition, Patent Document 2 below describes a technique for improving the toughness, adhesive strength, dimensional accuracy and processability of molded articles by means of a resin composition, wherein the resin composition contains: polyarylene sulfide, maleic anhydride-containing olefin copolymer, alkoxysilane coupling agent, glass flakes and glass fiber.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2002-129014

[0008] Patent Document 2: Japanese Patent Application Publication No. 2010-13515 Summary of the Invention

[0009] The problem the invention aims to solve

[0010] However, in recent years, with the increasing complexity of component structures across various technological fields, the thermal shock resistance requirements for molded resin compositions have become increasingly stringent. Conventional manufacturing techniques, including those described in the aforementioned patent documents, are gradually becoming inadequate to meet market demands. In particular, when molding bodies using injection molding or similar methods, material failure at the weld joints—the structurally weakest points—often becomes a problem. To address this, it is necessary to improve the mechanical strength of the weld joints. Furthermore, it is necessary to prevent the deterioration of the flexural toughness in the TD direction of the molded body, which is caused by anisotropy during molding. It should be noted that in this invention, the "TD direction" refers to the transverse direction, which is perpendicular to the "MD direction (Machine Direction)" of the resin flow direction during molding.

[0011] The present invention was developed in view of the aforementioned actual situation, and its objective is to provide: a polyarylene sulfide resin composition as a raw material for a molded body with excellent mechanical strength and flexural toughness in the TD direction at the welded portion, a molded body of the polyarylene sulfide resin composition, a method for manufacturing the polyarylene sulfide resin composition, and a method for manufacturing the molded body. Furthermore, the present invention provides: a polyarylene sulfide resin composition as a raw material for a molded body with excellent thermal shock resistance, a molded body of the polyarylene sulfide resin composition, a method for manufacturing the polyarylene sulfide resin composition, and a method for manufacturing the molded body.

[0012] Solution for solving the problem

[0013] In order to solve the aforementioned problems, the inventors conducted in-depth research on the crystallization behavior of molten PAS resin during molding. As a result, they found that by mixing a specified amount of zeolite, which serves as a nucleating agent for PAS resin crystallization, into the polyarylene sulfide resin composition, the mechanical strength of the welded portion of the molded body can be significantly improved. Furthermore, they found that by reducing the particle size of the mixed glass flakes, the flexural toughness in the TD direction can be improved, thereby improving the thermal shock resistance of the molded body. Thus, the present invention was completed.

[0014] That is, the present invention relates to a polyarylene sulfide resin composition, characterized in that it contains: polyarylene sulfide resin (A), olefin polymer (B), zeolite (C), glass fiber (D1) and glass flakes (D2), wherein the weight-average particle size of the aforementioned glass flakes (D2) is 30 to 100 μm.

[0015] In addition, the present invention relates to a molded article formed by molding the polyarylene sulfide resin composition described in any of the foregoing.

[0016] In addition, the present invention relates to a method for manufacturing a polyarylene sulfide resin composition, characterized by comprising the following steps: at a melting point above the polyarylene sulfide resin (A), the aforementioned polyarylene sulfide resin (A), olefin polymer (B), zeolite (C), glass fiber (D1) and glass flakes (D2) are melt-blended, wherein the weight-average particle size of the aforementioned glass flakes (D2) is 30 to 100 μm.

[0017] Furthermore, the present invention relates to a method for manufacturing a molded article, characterized by comprising the following steps: a step of manufacturing a polyarylene sulfide resin composition by the aforementioned manufacturing method; and a step of melt molding the obtained polyarylene sulfide resin composition.

[0018] The effects of the invention

[0019] According to the present invention, a polyarylene sulfide resin composition, a molded body of the polyarylene sulfide resin composition, a method for manufacturing the polyarylene sulfide resin composition, and a method for manufacturing the molded body can be provided as raw materials for molded bodies with excellent mechanical strength and flexural toughness in the TD direction at the welded portion. Furthermore, according to the present invention, a polyarylene sulfide resin composition, a molded body of the polyarylene sulfide resin composition, a method for manufacturing the polyarylene sulfide resin composition, and a method for manufacturing the molded body can be provided as raw materials for molded bodies with excellent thermal shock resistance. Attached Figure Description

[0020] Figure 1 This is a simplified diagram of the cuboid-shaped SUS steel used in the evaluation method for thermal shock resistance in the embodiments. Detailed Implementation

[0021] The polyarylene sulfide resin composition of the present invention contains: PAS resin (A), olefin polymer (B), zeolite (C), glass fiber (D1), and glass flakes (D2). The composition will be described below.

[0022] The polyarylene sulfide resin composition of the present invention contains PAS resin (A) as an essential component. The PAS resin (A) used in the present invention has a resin structure in which an aromatic ring bonded to a sulfur atom is used as a repeating unit. Specifically, it is a resin in which the structural portion shown in the following general formula (1) and, if necessary, the 3-functional structural portion shown in the following general formula (2) are used as repeating units.

[0023]

[0024] (where R is in the formula) 1 and R 2 Each of the following groups independently represents an alkyl, nitro, amino, phenyl, methoxy, or ethoxy group with 1 to 4 carbon atoms.

[0025]

[0026] The total number of moles of the 3-functional structural part shown in formula (2) relative to the total number of other structural parts is preferably in the range of 0.001 to 3 mol%, and particularly preferably in the range of 0.01 to 1 mol%.

[0027] Here, for the structural part shown in the aforementioned general formula (1), from the perspective of the mechanical strength of the aforementioned PAS resin (A), R in the formula 1 and R 2 Hydrogen atoms are particularly preferred. In this case, examples of para-bonded atoms shown in equation (3) and meta-bonded atoms shown in equation (4) can be cited.

[0028]

[0029] Among these, in terms of the heat resistance and crystallinity of the aforementioned PAS resin (A), it is particularly preferred that the sulfur atoms in the repeating unit are bonded to the aromatic rings in a para-position bonded structure as shown in the aforementioned general formula (3).

[0030] Furthermore, the aforementioned PAS resin (A) not only includes the structural portions shown in the aforementioned general formulas (1) and (2), but may also include the structural portions shown in the following structural formulas (5) to (8) in an amount of no more than 30 mol% of the total number of the structural portions shown in the aforementioned general formulas (1) and (2).

[0031]

[0032] In this invention, from the perspective of heat resistance and mechanical strength of PAS resin (A), it is particularly preferred that the structural parts shown in the aforementioned general formulas (5) to (8) are 10 mol% or less. When the aforementioned PAS resin (A) contains the structural parts shown in the aforementioned general formulas (5) to (8), the bonding mode can be any of random copolymers or block copolymers.

[0033] In addition, the aforementioned PAS resin (A) may have naphthalene thioether bonds or the like in its molecular structure, and is preferably 3 mol% or less, particularly preferably 1 mol% or less, relative to the total molar number of other structural sites.

[0034] The manufacturing method of the aforementioned PAS resin (A) is not particularly limited, and examples include: (Method 1) a method of polymerizing a dihaloaromatic compound by adding a polyhalogenated aromatic compound and / or other copolymerizing components as needed in the presence of sulfur and sodium carbonate; (Method 2) a method of polymerizing a dihaloaromatic compound by adding a polyhalogenated aromatic compound and / or other copolymerizing components as needed in a polar solvent and in the presence of a thioetherifying agent; (Method 3) a method of self-condensing p-chlorobenzenethiophenol by adding other copolymerizing components as needed; (Method 4) a method of melt polymerizing a diiodoaromatic compound and elemental sulfur under reduced pressure in the presence of a polymerization inhibitor optionally having functional groups such as carboxyl or amino groups. Among these methods, method (Method 2) is general and preferred. During the reaction, alkali metal salts of carboxylic acids and sulfonic acids, or alkali metal hydroxides, can be added to adjust the degree of polymerization. In the aforementioned (Preparation Method 2), it is particularly preferred to obtain PAS by the following method: In a heated mixture containing an organic polar solvent and a dihaloaromatic compound, an aqueous sulfide etherifying agent is introduced at a rate sufficient to remove water from the reaction mixture; a polyhaloaromatic compound is added to the organic polar solvent as needed; the dihaloaromatic compound and the sulfide etherifying agent react; and the water content in the reaction system is controlled to be in the range of 0.02 to 0.5 mol per mol of the organic polar solvent, thereby producing PAS (refer to Japanese Patent Application Publication No. 07-22869). (No. 9); A method for carrying out a reaction in the presence of a solid alkali metal sulfide and an aprotic polar organic solvent, by adding a dihaloaromatic compound and, as needed, a polyhaloaromatic compound and / or other copolymerizing components, while controlling the alkali metal hydrogen sulfide and the organic acid alkali metal salt to be in the range of 0.01 to 0.9 mol relative to 1 mol of sulfur source and the organic acid alkali metal salt to be in the range of 0.02 mol relative to 1 mol of the aprotic polar organic solvent (refer to WO2010 / 058713).Specific examples of dihaloaromatic compounds include p-dihalobenzene, m-dihalobenzene, o-dihalobenzene, 2,5-dihalotoluene, 1,4-dihalonaphthalene, 1-methoxy-2,5-dihalobenzene, 4,4'-dihalobiphenyl, 3,5-dihalobenzoic acid, 2,4-dihalobenzoic acid, 2,5-dihalonitrobenzene, 2,4-dihalonitrobenzene, 2,4-dihaloanisole, p,p'-dihalodiphenyl ether, and 4,4'-dihalobenzophenone. Compounds containing 4,4'-dihalodiphenyl sulfone, 4,4'-dihalodiphenyl sulfoxide, 4,4'-dihalodiphenyl sulfide, and alkyl groups having 1 to 18 carbon atoms on the aromatic ring of the aforementioned compounds, as polyhalogenated aromatic compounds, include 1,2,3-trihalobenzene, 1,2,4-trihalobenzene, 1,3,5-trihalobenzene, 1,2,3,5-tetrahalobenzene, 1,2,4,5-tetrahalobenzene, 1,4,6-trihalonaphthalene, etc. Furthermore, the halogen atoms contained in the aforementioned compounds are preferably chlorine or bromine atoms.

[0035] There are no particular limitations on the post-treatment methods for the reaction mixture containing PAS resin obtained through the polymerization process. For example, the following methods can be used: (Post-treatment 1) After the polymerization reaction is completed, firstly, the reaction mixture is directly distilled to remove the solvent, or acid or alkali is added and the solvent is removed by distillation under reduced pressure or normal pressure. Then, the solid residue after solvent removal is washed once or twice or more with water, the reaction solvent (or an organic solvent with equivalent solubility for low molecular weight polymers), acetone, methyl ethyl ketone, alcohols, etc., and then further neutralized, washed with water, filtered, and dried. Or (Post-treatment 2) After the polymerization reaction is completed, water, acetone, methyl ethyl ketone, alcohols, ethers, halogenated hydrocarbons, aromatic hydrocarbons, aliphatic hydrocarbons, etc. (solvents that are soluble in the polymerization solvent used and are at least unsuitable solvents for PAS) are added to the reaction mixture. As a settling agent, it is used to settle solid products such as PAS and inorganic salts, and then filter, wash, and dry them; or (post-treatment 3), after the polymerization reaction is completed, a reaction solvent (or an organic solvent with equivalent solubility to the low molecular weight polymer) is added to the reaction mixture and stirred, then filtered to remove the low molecular weight polymer, and then washed once or twice or more with solvents such as water, acetone, methyl ethyl ketone, or alcohols, followed by neutralization, water washing, filtration, and drying; (post-treatment 4), after the polymerization reaction is completed, water is added to the reaction mixture for water washing and filtration, and acid is added during water washing as needed for acid treatment, followed by drying; (post-treatment 5), after the polymerization reaction is completed, the reaction mixture is filtered, and as needed, it is washed once or twice or more with the reaction solvent, and then further washed with water, filtered, and dried.

[0036] It should be noted that in the post-treatment methods exemplified in (post-treatment 1) to (post-treatment 5) above, the drying of PAS resin (A) can be carried out in a vacuum, or in an air atmosphere or an inactive gas atmosphere such as nitrogen.

[0037] The polyaryl sulfide resin composition of the present invention contains an olefin polymer (B) as an essential component. Examples of raw materials for the olefin polymer (B) include polymers obtained by polymerizing α-olefins such as ethylene, propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, and isobutene, either alone or in combination with two or more of them, and copolymers of the aforementioned α-olefins with α,β-unsaturated acids and their alkyl esters such as (meth)acrylic acid, methyl (meth)acrylate, ethyl (meth)acrylate, and butyl (meth)acrylate. It should be noted that in the present invention, (meth)acrylic acid refers to acrylic acid and / or methacrylic acid.

[0038] For olefin polymers (B), from the viewpoint of improving compatibility with other components in the polyarylene sulfide resin composition, it is preferable to use olefin polymers having functional groups in the polymer as raw materials. This can improve the thermal shock resistance of the molded article, etc. Examples of such functional groups include epoxy groups, carboxyl groups, isocyanate groups, oxazoline groups, and groups represented by the formula: R(CO)O(CO)- or R(CO)O- (where R represents an alkyl group with 1 to 8 carbon atoms). Olefin polymers having the above functional groups can be obtained, for example, by copolymerizing α-olefins with vinyl polymerizable compounds having the aforementioned functional groups. Examples of vinyl polymerizable compounds having the aforementioned functional groups include, in addition to the aforementioned α,β-unsaturated acids and their alkyl esters, maleic acid, fumaric acid, itaconic acid, and α,β-unsaturated dicarboxylic acids and their derivatives (monoesters or diesters, and their anhydrides, etc.) with 4 to 10 carbon atoms, as well as glycidyl (meth)acrylate, etc. Among the aforementioned olefin polymers, as olefin polymer (B), from the perspective of improving toughness and impact resistance, it is preferable to be an olefin polymer having at least one functional group selected from the group consisting of epoxy, carboxyl, and groups represented by the formula: R(CO)O(CO)- or R(CO)O- (where R represents an alkyl group with 1 to 8 carbon atoms). The aforementioned olefin resin is particularly preferably a copolymer comprising olefin, alkyl acrylate and glycidyl acrylate.

[0039] Regarding the content of the olefin polymer (B) in the polyarylene sulfide resin composition of the present invention, when the total amount of PAS resin (A) is set to 100 parts by mass, the lower limit of the content range is preferably 5 parts by mass, more preferably 7 parts by mass. On the other hand, the upper limit of the content range is preferably 15 parts by mass, more preferably 13 parts by mass. By designing the content range of the olefin polymer (B) within the above range, the molding flowability and thermal shock resistance of the molded article can be improved in a balanced manner.

[0040] The polyaryl sulfide resin composition of the present invention contains zeolite (C) as an essential component. As the raw material for the zeolite (C) used in the present invention, any crystalline aluminosilicate known to those skilled in the art can be used, for example, known substances represented by the following general formula.

[0041] x(M I 2, M II O·Al2O3·nSiO2·mH2O

[0042] Here, M I Metals with a monovalent valence, such as alkali metals like Li, Na, and K, or ammonium, alkylammonium, pyridinium, aniline ions, and hydrogen ions, are represented by M. II Metals with a divalent oxidation state, such as alkaline earth metals like Ca, Mg, Ba, and Sr. From the viewpoint of effectively adjusting the melting and crystallization temperature, M is preferred. II For Ca, M I It does not actually exist.

[0043] As the zeolite (C) used in this invention, any zeolite, whether natural or synthetic, can be used. Examples of natural zeolites include borosilicate, clinoptilolite, sodium zeolite, mesozeolite, Thomsonite, fibrous zeolite, calcium zeolite, barium zeolite, orthorhombic calcium zeolite, turbidite, mordenite, Yugahara zeolite, malachite, potassium zeolite, flake zeolite, clinoptilolite, zeolite, columnar zeolite, cycloid zeolite, calcium cross zeolite, cross zeolite, sodium chalcogenide, chalcogenide, and octahedral zeolite. Examples of synthetic zeolites include type A, type X, type Y, type L, mordenite, and chalcogenide, with type A zeolites being preferred. Furthermore, zeolites containing calcium as a metal atom are preferred, and those containing calcium as a metal atom and substantially free of alkali metals are particularly preferred. Among the above-mentioned zeolites, synthetic zeolites are preferred. Commercially available products can be used as synthetic zeolites, such as Type A zeolite A-4 powder, Type A zeolite A-5 powder (both trademarks, manufactured by Tosoh Corporation), CS-100K, CS-100S (both trademarks, manufactured by Katsuta Chemical Co., Ltd.), AMT-25 (trademark, manufactured by Mizusawa Chemical Industry Co., Ltd.), Mizukalizer ES (trademark, manufactured by Mizusawa Chemical Industry Co., Ltd.), etc.

[0044] From the viewpoint of increasing the melt crystallization temperature of the resin composition, the zeolite (C) is preferably in the form of powder or granules, with an upper limit of 3 μm, particularly preferably 2 μm, for the average particle size. Here, the average particle size is a value (D50) obtained by the Coulter counter method. It should be noted that the lower limit of the average particle size range of the zeolite (C) is preferably 0.1 μm. By moderately increasing the melt crystallization temperature of the resin composition, the solidification based on resin crystallization within the mold during injection molding is accelerated, thereby shortening the molding cycle.

[0045] In the polyaryl sulfide resin composition of the present invention, zeolite (C) acts as a nucleating agent during the crystallization of the molten PAS resin (A), thereby significantly improving the mechanical strength of the welded portion of the molded body. To optimize the crystallization rate of the PAS resin (A) and improve the mechanical strength of the welded portion of the molded body, the upper limit of the zeolite (C) content in the polyaryl sulfide resin composition of the present invention is preferably 20 parts by mass, more preferably 15 parts by mass, further preferably 10 parts by mass, and most preferably 7 parts by mass, when the total amount of PAS resin (A) is set to 100 parts by mass. Furthermore, to effectively function as a nucleating agent for PAS resin (A), the lower limit of the zeolite (C) content is preferably set to 1 part by mass.

[0046] The polyarylene sulfide resin composition of the present invention contains glass fiber (D1) as an essential component. As the raw material for the glass fiber (D1) used in the present invention, substances known to those skilled in the art can be used, and the fiber diameter, fiber length, and aspect ratio can be appropriately adjusted according to the intended use of the molded article. It should be noted that, in order to improve dispersibility in PAS resin (A), the glass fiber (D1) can be surface-treated with known coupling agents, binders, etc. Regarding the content of glass fiber (D1) in the polyarylene sulfide resin composition of the present invention, when the total amount of PAS resin (A) is set to 100 parts by mass, the lower limit of the content range is preferably 32 parts by mass, more preferably 48 parts by mass. On the other hand, the upper limit of the content range is preferably 120 parts by mass, more preferably 100 parts by mass. By designing the range of glass fiber (D1) content within the above range, the molding flowability and mechanical strength of the molded article can be improved in a balanced manner.

[0047] The polyarylene sulfide resin composition of the present invention contains glass flakes (D2) as an essential component. The weight-average particle size of the glass flakes (D2) is preferably in the range of 100 μm or less, more preferably in the range of 30 μm or more to 100 μm or less. In the present invention, glass flakes with a weight-average particle size preferably in the range of 100 μm or less, more preferably in the range of 30 μm or more to 100 μm or less, are used as raw materials. The weight-average particle size of glass flakes circulating in the market typically exceeds 100 μm significantly. In addition to PAS resin (A), olefin polymer (B), zeolite (C), and glass fiber (D1), the polyarylene sulfide resin composition of the present invention also incorporates glass flakes with a weight-average particle size preferably in the range of 100 μm or less, more preferably in the range of 30 μm to 100 μm, resulting in excellent mechanical strength of the welded portion and flexural toughness in the TD direction of the molded body obtained using this as a raw material, and is therefore preferred. The method for determining the weight-average particle size of the glass flakes (D2) is described below.

[0048] It should be noted that the weight-average particle size of the aforementioned glass flakes (D2) is a value in the polyaryl sulfide resin composition, which is optionally shaped as granules, strands, etc., and is not a value of the glass flake raw material itself. The glass flakes (D2) can be glass flakes that have been adjusted in the polyaryl sulfide resin composition so that the weight-average particle size before mixing is preferably in the range of 100 μm or less, more preferably in the range of 30 μm or more to 100 μm or less. Alternatively, if the weight-average particle size is greater than 100 μm before mixing, it can be pulverized during mixing, thereby adjusting the final weight-average particle size in the polyaryl sulfide resin composition to preferably be in the range of 100 μm or less, more preferably in the range of 30 μm or more to 100 μm or less.

[0049] Regarding the content of glass flakes (D2) in the polyaryl sulfide resin composition of the present invention, when the total amount of PAS resin (A) is set to 100 parts by mass, the lower limit of the content range is preferably 4 parts by mass, more preferably 6 parts by mass. On the other hand, the upper limit of the content range is preferably 70 parts by mass, more preferably 50 parts by mass. By designing the content range of glass flakes (D2) within the above range, the molding flowability and the reduction of warpage of the molded body can be improved in a balanced manner.

[0050] It should be noted that, in this invention, the mass ratio ((D1) / (D2)) of glass fiber (D1) to glass flakes (D2) in the polyaryl sulfide resin composition is preferably set to 8 or less, more preferably 5 or less, and even more preferably 2 or less. By designing the range of (D1) / (D2) to be within the above range, the mechanical strength of the welded portion of the molded article and the reduction in warpage can be improved in a balanced manner. The lower limit of the range of (D1) / (D2) is not particularly limited, and examples 1 and above are examples.

[0051] Furthermore, in addition to the aforementioned components, the polyaryl sulfide resin composition of the present invention may be suitably formulated with, depending on the application, other synthetic resins besides the aforementioned PAS resin (A) and olefin polymer (B), such as epoxy resin, polyester resin, polyamide resin, polyimide resin, polyetherimide resin, polycarbonate resin, polyphenylene ether resin, polysulfone resin, polyethersulfone resin, polyetheretherketone resin, polyetherketone resin, polyaryl resin, polyethylene resin, polypropylene resin, polytetrafluoroethylene resin, polydifluoroethylene resin, polystyrene resin, ABS resin, phenolic resin, polyurethane resin, liquid crystal polymer, etc. (hereinafter referred to as synthetic resins) as any component. In this invention, the aforementioned synthetic resin is not an essential component. When compounding, the proportion of the synthetic resin is not particularly limited as long as it does not impair the effect of this invention. Furthermore, it is not limited in general, depending on the purpose. For example, the proportion of synthetic resin compounded in the polyarylene sulfide resin composition of this invention is preferably 5 parts by mass or less, more preferably 10 parts by mass or less, and even more preferably 15 parts by mass or less, relative to 100 parts by mass of PAS resin (A). In other words, the proportion of PAS resin (A) relative to the total amount of PAS resin (A) and the synthetic resin can be exemplified as preferably (100 / 115) or more, more preferably (100 / 110) or more, based on a mass basis.

[0052] Furthermore, the polyarylene sulfide resin composition of the present invention can be further formulated with commonly known additives such as colorants, antistatic agents, antioxidants, heat stabilizers, ultraviolet stabilizers, ultraviolet absorbers, foaming agents, flame retardants, flame retardant additives, rust inhibitors, and coupling agents as optional components, as needed. These additives are not essential components, but when formulated, their proportions are not particularly limited as long as they do not impair the effects of the present invention. In addition, they are not limited in a general sense, depending on the specific purpose. For example, they can be used in a range of 0.01 to 1000 parts by weight relative to 100 parts by weight of PAS resin (A), in a manner that does not impair the effects of the present invention, and can be appropriately adjusted according to the purpose and application.

[0053] The method for manufacturing the polyarylene sulfide resin composition of the present invention comprises the following steps: mixing raw materials of each necessary component of polyarylene sulfide resin (A), olefin polymer (B), zeolite (C), glass fiber (D1) and glass flakes (D2), as well as other arbitrary raw materials, as needed, and performing melt mixing above the melting point of PAS resin.

[0054] The preferred method for manufacturing the polyarylene sulfide resin composition of the present invention can be carried out through the following steps: the raw materials of the aforementioned essential components and the raw materials of the aforementioned arbitrary components are put into various forms such as powder, granules, and flakes into a ribbon mixer, Henschel mixer, V-type agitator, etc. and dry-mixed, and then put into a known melt mixing mill such as a Banbury internal mixer, mixing roller, single screw or twin screw extruder and kneader, and melt-mixed at a resin temperature that is above the melting point of PAS resin, preferably above the melting point +10°C, more preferably from the melting point +10°C to the melting point +100°C, and even more preferably from the melting point +20°C to the melting point +50°C.

[0055] From the viewpoint of dispersibility and productivity, a twin-screw compounding extruder is preferred as the aforementioned melt mixing mill. For example, it is preferable to perform melt mixing while appropriately adjusting the resin discharge rate to a range of 5 to 500 kg / h and the screw speed to a range of 50 to 500 rpm. More preferably, melt mixing is performed under conditions where the ratio (discharge rate / screw speed) is in the range of 0.02 to 5 kg / h / rpm. Furthermore, when fillers or additives are added to the aforementioned components, from the viewpoint of dispersibility, it is preferable to feed them into the extruder from the side feeder of the aforementioned twin-screw compounding extruder. Regarding the location of the side feeder, the ratio of the distance from the resin input section of the extruder to the side feeder to the total screw length of the aforementioned twin-screw compounding extruder is preferably in the range of 0.1 or more, more preferably in the range of 0.3 or more, and preferably in the range of 0.9 or less, more preferably in the range of 0.3 or less. Therefore, a range of 0.1 to 0.9 is preferred. Among these, a range of 0.3 to 0.7 is particularly preferred.

[0056] As mentioned above, the following methods can be cited as ways to optimize the weight-average particle size of glass flakes (D2). For example, methods can be cited such as feeding glass flakes together with PAS resin (A), olefin polymer (B), and zeolite (C) other than glass fiber (D1) from the top feeder inlet of the aforementioned melt mixer and performing a mixing process, and forming the melt mixture (polyarylene sulfide resin composition) into granules; feeding the melt mixture into the extruder from the side feeder and performing a mixing process, and forming the melt mixture (polyarylene sulfide resin composition) into granules, etc.

[0057] Additionally, a method can be cited for processing melt mixing (melt blending) by adjusting the shearing of glass flakes. As a method for processing glass flakes under conditions where they are not easily sheared, for example, a method involving mixing and / or blending using a single screw with a fully threaded type, a single screw having a mixing mechanism such as a Dulmadge type, a Maddock type, or a needle type, etc., is preferred. Furthermore, in this case, a single screw with a compression ratio of 2 or less is preferred, and even more preferably, a single screw with a compression ratio in the range of 2 or less but more than 1 is preferred, and particularly preferably, a fully threaded type single screw with a compression ratio of 2 or less is preferred. On the other hand, as a condition where glass flakes are easily sheared, a method can be cited, for example, a process involving blending using a forward (conveying capacity) kneading type screw, a reverse (restoring capacity) kneading screw, etc., as screw forms. In this case, the lower limit of the angle of any kneading disc is preferably 30 degrees or more, more preferably 45 degrees or more. On the other hand, the upper limit is preferably 90 degrees or less. The weight-average particle size of the glass flakes in the polyaryl sulfide resin composition can be appropriately adjusted by the above-described processing method so that the glass flakes used as raw materials tend to be larger than the weight-average particle size, in which case the glass flakes are easily sheared; and if the glass flakes used as raw materials tend to be within the particle size range, in which case the glass flakes are not easily sheared.

[0058] Furthermore, the effective length (L / D) is not particularly limited as long as it is a value used when molding common polyarylether sulfide resins. For example, a range of 1 or more is preferred, a range of 5 or more is more preferred, a range of 100 or less is more preferred, and a range of 50 or less is more preferred. Thus, a range of 1 to 100 is preferred, and a range of 5 to 50 is more preferred.

[0059] The polyarylene sulfide resin composition of the present invention obtained by such melt mixing is a melt-mixed compound (melt mixture) containing the aforementioned essential components, as well as any components added as needed and their source components. Preferably, after such melt mixing, it is processed into granules, flakes, particles, powders, etc. by known methods, and then pre-dried at a temperature of 100 to 150°C as needed for various molding processes.

[0060] The polyarylene sulfide resin composition of the present invention, manufactured by the aforementioned manufacturing method, is in the form of a matrix consisting of PAS resin (A) and dispersed with an olefin polymer (B), glass fiber (D1), and glass flakes (D2). Therefore, the polyarylene sulfide resin composition exhibits excellent molding flowability and thermal shock resistance of the molded body. Furthermore, the presence of zeolite (C) optimizes the crystallization behavior of the PAS resin (A), resulting in a significant improvement in the mechanical strength of the weld joints of the molded body.

[0061] The molded article of the present invention is formed by molding the aforementioned polyarylene sulfide resin composition. Furthermore, the method for manufacturing the molded article of the present invention includes, for example, a step of melt molding the aforementioned polyarylene sulfide resin composition. Melt molding can be a known method, such as injection molding, compression molding, extrusion molding of composites, sheets, tubes, etc., pultrusion molding, blow molding, transfer molding, etc. Injection molding is particularly suitable. In the case of melt molding, there are no particular limitations on the various molding conditions, and molding can be performed using generally common methods. For example, the following step can be included: after melting the aforementioned polyarylene sulfide resin composition in a melt molding machine at a temperature range above the melting point of the polyarylene sulfide resin, preferably at a temperature range above the melting point +10°C, more preferably at a temperature range from the melting point +10°C to the melting point +100°C, and even more preferably at a temperature range from the melting point +20°C to the melting point +50°C, various molding processes can be performed. For example, in injection molding, the resin can be injected into a mold from a resin outlet and molded. At this time, the mold temperature is preferably within a known temperature range, such as a range above room temperature (23°C), more preferably above 40°C, and even more preferably above 120°C. Furthermore, a range below 300°C is preferred, more preferably below 200°C, and most preferably below 180°C. It should be noted that the holding pressure process within the mold requires the time required for the gate sealing to be completed based on the resin curing. The holding pressure time is affected by the size and shape of the molded article, and therefore cannot be determined in a fixed way. However, by setting it within the above-mentioned temperature range, it becomes faster, shortening the molding cycle, and allowing for sufficient resin crystallization. This, in turn, allows the physical properties of the molded article to be better reflected, and is therefore preferred.

[0062] In addition, during melt molding, for example, melt mixing can be carried out under conditions that suppress the breakage of glass flakes based on shear during resin melting, and the glass flakes in the molded body can be maintained within the range of the weight-average particle size of glass flakes in the polyarylether sulfide resin composition.

[0063] As a primary application example of the molded body of the present invention, it can also be used for: housings of various household appliances, mobile phones, and electronic devices such as PCs (Personal Computers); protective and support members for integrated modules of box-type electrical / electronic components; multiple individual semiconductors or components; sensors; LED lights; connectors; sockets; resistors; relay boxes; switches; coil frames; capacitors; variable capacitor housings; optical pickups; oscillators; various terminal boards; transformers; pistons; printed circuit boards; tuners; speakers; microphones; headphones; small motors; magnetic head sockets; power components; terminal blocks; semiconductors; liquid crystals; FDD carriages; FDD racks; motor brush holders; parabolic antennas; computer-related components, etc.; and electrical / electronic components such as VTR components, television components, irons, hair dryers, and rice cooker components. Components for household and office electrical products, including induction cooker parts, audio equipment parts, audio / laser discs / optical discs / DVD disks / Blu-ray discs and other audio / video equipment parts, lighting parts, refrigerator parts, air conditioner parts, typewriter parts, word processor parts, or bathroom equipment parts such as water heaters and bathtub hot water volume and temperature sensors; mechanical parts, including office computer parts, telephone parts, fax parts, copier parts, cleaning jigs, engine parts, lighters, typewriters, etc.; optical equipment and precision mechanical parts, including microscopes, telescopes, cameras, clocks, etc.; and components for storing alternator terminals, alternator connectors, etc. Brush holders, slip rings, IC voltage regulators, dimmer power meter bases, relay components, suppressor switches, exhaust gas valves and other valves, fuel-related / exhaust / intake system pipes, air intake nozzles and vent pipes, intake manifolds, fuel pumps, engine coolant connectors, carburetor bodies, carburetor gaskets, exhaust gas sensors, coolant sensors, oil temperature sensors, brake pad wear sensors, throttle position sensors, crankshaft position sensors, air flow meters, brake pad wear sensors, air conditioning thermostat bases, heater hot air flow control valves, radiator engine brush holders, water pump impellers, turbo fans, scraper engine-related components, distributors, starter switches, ignition coils and their bushings, engine insulation... Insulators, engine rotors, engine cores, starter relays, transmission wiring, window washer nozzles, air conditioning panel switch base plates, coils for fuel-related solenoid valves, fuse connectors, horn terminals, electrical component insulation boards, stepper engine rotors, lamp sockets, lamp reflectors, lamp housings, brake cylinder pistons, solenoid coils, engine oil filters, ignition device housings, power components, converters, power devices, smart power components, insulated-gate bipolar transistors, power control units, reactors, converters, capacitors, insulators, engine terminal blocks, batteries, electric compressors, battery current sensors, terminal blocks, housings for ignition coils in DLI systems, and other automotive / vehicle-related components, as well as various other applications.

[0064] Example

[0065] The present invention will be further described in detail below with specific examples. In addition, parts and percentages are used as mass standards unless otherwise specified.

[0066] (Determination of melt viscosity of PPS resin)

[0067] Using a high-performance rheometer (Shimadzu CFT-500D), at 300℃ and a load of 1.96 × 10⁻⁶, the results were obtained. 6 At Pa and L / D = 10 (mm) / 1 (mm), the melt viscosity of the PPS resin manufactured in the following manufacturing example was measured after holding it for 6 minutes.

[0068] (Manufacturing example)

[0069] Manufacturing of PPS resin

[0070] [Process 1]

[0071] In a 150-liter high-pressure reactor equipped with stirring blades and connected to a pressure gauge, thermometer, condenser, decanter, and distillation column, 33.075 parts by mass (225 mol) of p-dichlorobenzene (hereinafter referred to as "p-DCB"), 3.420 parts by mass (34.5 mol) of NMP, 27.300 parts by mass of a 47.23% NaSH aqueous solution (230 mol as NaSH), and 18.533 parts by mass of a 49.21% NaOH aqueous solution (228 mol as NaOH) were added. The mixture was stirred and heated to 173°C over a nitrogen atmosphere for 5 hours, allowing 27.300 parts by mass of water to distill off. The reactor was then sealed. During dehydration, the p-DCB distilled off via azeotropic distillation was separated in the decanter and returned to the high-pressure reactor. After dehydration, the contents of the high-pressure reactor contained a particulate anhydrous sodium sulfide composition dispersed within the p-DCB. The NMP content in the composition is 0.079 parts by mass (0.8 mol parts), indicating that 98 mol% (33.7 mol parts) of the added NMP is hydrolyzed to the sodium salt of the open-ring form of NMP (4-(methylamino)butyric acid) (hereinafter referred to as "SMAB"). The amount of SMAB in the autoclave is 0.147 mol parts per mole of sulfur atoms present in the autoclave. The theoretical dehydration amount when the total amount of added NaSH and NaOH becomes anhydrous Na2S is 27.921 parts by mass, indicating that of the 0.878 parts by mass (48.8 mol parts) of residual water in the autoclave, 0.609 parts by mass (33.8 mol parts) are consumed by the hydrolysis reaction of NMP and NaOH and do not exist in the autoclave as water. The remaining 0.269 parts by mass (14.9 mol parts) remain in the autoclave as water or water of crystallization. The water content in the autoclave is 0.065 moles per mole of sulfur atoms present in the autoclave.

[0072] [Process 2]

[0073] After the aforementioned dehydration process, the internal temperature is cooled to 160°C, and 46.343 parts by mass (467.5 moles) of NMP are added, followed by heating to 185°C. The water content in the autoclave is 0.025 moles relative to the 1 mole of NMP added in step 2. When the gauge pressure reaches 0.00 MPa, the valve connected to the distillation column is opened, and the internal temperature is raised to 200°C over 1 hour. At this time, cooling and valve opening are controlled to ensure that the outlet temperature of the distillation column is below 110°C. The distilled p-DCB and water mixture vapor is condensed in the condenser, separated in the decanter, and the p-DCB is returned to the autoclave. The distillate water volume is 0.228 parts by mass (12.7 moles).

[0074] [Process 3]

[0075] At the start of step 3, the water content in the autoclave was 0.041 parts by mass (2.3 moles), which is 0.005 moles relative to 1 mole of NMP added in step 2, and 0.010 moles relative to 1 mole of sulfur atoms present in the autoclave. The amount of SMAB in the autoclave was the same as in step 1, which is 0.147 moles relative to 1 mole of sulfur atoms present in the autoclave. Next, the internal temperature was raised from 200°C to 230°C over 3 hours, stirred at 230°C for 1 hour, then raised to 250°C and stirred for 1 hour. The gauge pressure at the initial internal temperature of 200°C was 0.03 MPa, and the final gauge pressure was 0.40 MPa. After cooling, 0.650 parts by mass of the resulting slurry was injected into 3 parts by mass (3 liters) of water, stirred at 80°C for 1 hour, and then filtered. The filter cake was then stirred again in 3 parts by mass (3 liters) of hot water for 1 hour, washed, and filtered. This operation was repeated 4 times. Add 3 parts by weight (3 liters) of hot water and acetic acid to the filter cake again, adjust the pH to 4.0, stir for 1 hour, wash, and filter. Repeat this process twice. Dry the mixture overnight at 120°C using a hot air dryer to obtain a white powdery PPS resin (A). The polymer has a melt viscosity of 56 Pa·s at 300°C and a non-Newtonian index of 1.07.

[0076] (Raw materials used)

[0077] The following shows the components that make up the raw materials of the polyarylether sulfide resin composition.

[0078] • PAS resin (A); The PPS resin manufactured in the aforementioned manufacturing example.

[0079] • Olefin polymers (B)

[0080] Olefin polymer (B-1) (ethylene-maleic anhydride-glycidyl methacrylate copolymer); trade name "BONDFAST 7L", manufactured by Sumitomo Chemical Co., Ltd.

[0081] Olefin polymer (B-2) (ethylene-maleic anhydride-glycidyl methacrylate copolymer); trade name "BONDFAST 7M", manufactured by Sumitomo Chemical Co., Ltd.

[0082] Olefin polymer (B-3) (ethylene-α-olefin polymer); trade name "Engage8842", manufactured by Dow Inc.

[0083] Silicate minerals

[0084] Zeolite (C-1); Trade name "Zeorum Type A A-5, manufactured by Tosoh Corporation"

[0085] Talc (C-2); Trade name "HF5000PJ", manufactured by Matsumura Sangyo Co., Ltd.

[0086] Mica (C-3); trade name "A-21S", manufactured by Yamaguchi Mica Co., Ltd.

[0087] Calcium carbonate (C-4); trade name "Grade 1 Calcium Carbonate", manufactured by Sankyo Flour Milling Co., Ltd.

[0088] • Glass fiber (D1); fiber length 3mm, average diameter 10μm, trade name "T-717H", manufactured by Nippon Electric Glass Co., Ltd.

[0089] • Glass flakes (D2)

[0090] Glass flakes (D2-1); average thickness 5μm, weight-average particle size 160μm, trade name "REFG-301", manufactured by Nippon Sheet Glass Co., Ltd.

[0091] Glass flakes (D2-2); average thickness 5μm, weight-average particle size 160μm, trade name "REFG-315", manufactured by Nippon Sheet Glass Co., Ltd.

[0092] Glass flakes (D2-3); average thickness 5μm, weight-average particle size 600μm, trade name "REFG-112", manufactured by Nippon Sheet Glass Co., Ltd.

[0093] (Preparation of polyarylene sulfide resin composition)

[0094] According to the composition and mixing amounts (all by weight) recorded in Tables 1 and 2, the materials were mixed evenly in a rotary drum. Then, glass flakes (D2) were fed together with PAS resin (A), olefin polymer (B), and zeolite (C) from the top feeder inlet of a twin-screw extruder (Japan Steel Works, TEX30α) with a vent. The resin discharge rate was set to 30 kg / h, the screw speed to 220 rpm, the screw shape to be fully threaded, and the resin temperature to 320°C. The mixture was melt-blended to obtain the granules of the polyarylene sulfide resin compositions of Examples 1-9 and Comparative Examples 1-6.

[0095] (Method for determining the weight-average particle size of glass flakes)

[0096] The granules of the aforementioned polyarylene sulfide resin composition were calcined at 550°C for 3 hours, and the particle size distribution of Ash was determined using an acoustic / vibrational sieving method. The equipment, measurement methods, and measurement conditions are shown below.

[0097] Equipment used: RPS-85 (manufactured by Seishin Enterprise Co., Ltd.)

[0098] Measurement method: 1. Place The screen is installed in the device.

[0099] 2. Place an appropriate amount of sample into the sample cup.

[0100] 3. Store the aperture of the sieve in the device.

[0101] 4. Use an acoustic / vibrating sieving device for sieving (automatic metering and sieving).

[0102] Measurement conditions: Measurement range 20–1400 μm

[0103] Sound intensity 5

[0104] Sieving time: 5 minutes

[0105] Vibration interval 1 time / second

[0106] (Determination of the melt crystallization temperature of polyarylether sulfide resin compositions)

[0107] The melting crystallization temperature (°C) was determined as follows: the polyarylene sulfide resin composition was melted at 350°C, then rapidly cooled to prepare an amorphous film. Approximately 10 mg of the film was measured and determined using a differential scanning calorimeter (Perkin Elmer "DSC8500").

[0108] The determination conditions are as follows: after melting and holding at 350℃ for 3 minutes, the temperature is reduced at a rate of 20℃ / min, and the temperature of the exothermic peak accompanying crystallization is measured as the melting and crystallization temperature.

[0109] (Methods for evaluating weld strength)

[0110] (Manufacturing of shaped parts)

[0111] Granules of the polyarylene sulfide resin compositions of Examples 1-9 and Comparative Examples 1-6 were fed into a Sumitomo Heavy Industries injection molding machine (SE75D-HP) with the barrel temperature set at 310°C. Injection molding was performed using an ISO type A1 dumbbell plate molding die with a welded portion in the center of the molded article, with the die temperature set at 140°C, to obtain an ISO type A1 dumbbell plate with a welded portion in the center of the molded article.

[0112] The holding time during molding is determined by measuring the gate sealing time until the mold internal pressure reaches zero during the holding time. Examples 1-9 were carried out with a holding time of 12 seconds, and Comparative Examples 1-6 were carried out with a holding time of 13 seconds.

[0113] (Determination of weld strength of molded parts)

[0114] The tensile breaking strength of the obtained test pieces was determined using an Instron tensile testing machine at a strain rate of 5 mm / min, a support spacing of 115 mm, and a temperature of 23 °C.

[0115] (Evaluation method for flexural toughness in the TD direction)

[0116] (Manufacturing of shaped parts)

[0117] Granules of the polyarylene sulfide resin compositions of Examples 1-9 and Comparative Examples 1-6 were fed into a Sumitomo Heavy Industries injection molding machine (SE75D-HP) with the barrel temperature set at 310°C. After melt mixing at a melt temperature of 310°C and a fully threaded screw shape, the mixture was injection molded using a 60×60×2mm flat plate molding die with the die temperature adjusted to 140°C to obtain a 60×60×2mm flat plate molded article. Subsequently, the article was cut into a 25×60×2mm shape with the resin flow direction as the short side for bending tests.

[0118] (Determination of bending elongation in the TD direction)

[0119] Based on JIS-K7171, the bending elongation (%) in the TD direction of the obtained test pieces was measured. The greater the elongation, the better the bending toughness in the TD direction.

[0120] [Table 1]

[0121]

[0122] [Table 2]

[0123]

[0124] As can be seen from the results in Tables 1 and 2, the mechanical strength of the welded portions in the molded bodies of the polyarylene sulfide resin compositions of Examples 1-9 is significantly improved compared to the molded body of Comparative Example 1. On the other hand, it can be seen that in the molded bodies of the polyarylene sulfide resin compositions of Comparative Examples 2-5, which contain silicate minerals such as talc, mica, and calcium carbonate (similar to zeolite (C)), the weld strength of the molded bodies deteriorates, particularly because talc, mica, and calcium carbonate cannot optimize the crystallization rate of PPS resin as effectively as zeolite (C).

[0125] Furthermore, it is known that, compared with the molded body of Comparative Example 6 which uses glass flakes (D2) with a large weight-average particle size, the weld strength of the molded bodies of the polyarylether sulfide resin compositions of Examples 1 to 9 is improved, and the bending toughness in the TD direction is also improved.

[0126] (Evaluation method for resistance to thermal shock)

[0127] (Manufacturing of shaped parts)

[0128] In accordance with Figure 1 The rectangular SUS steel shown (hereinafter referred to as "rectangular steel") was placed in a mold cavity with a resin thickness of 1 mm covering the entire surface. Granules of the polyarylether sulfide resin compositions of Examples 1-9 and Comparative Examples 1-6 were then fed into a Sumitomo Heavy Industries injection molding machine (SE75D-HP) with a barrel temperature set at 310°C. The mold temperature was adjusted to 140°C for injection molding, producing a molded body of the rectangular steel and resin composite for evaluating its resistance to thermal shock. At this time, from Figure 1 On the upper surface of a rectangular steel bar (L: 25mm, W: 40mm, H: 10mm), there are two through holes (2). The bar is fixed by needles of the same diameter set in the mold and no resin flows in. The bar is injection molded from two points (3) on the side of the rectangular steel bar at the needle point gate. The molded body has multiple welded parts.

[0129] (Determination of the thermal shock resistance of molded parts)

[0130] The obtained test piece was placed into a thermal shock testing apparatus (ESPEC CORPORATION "TSA-103EL") and subjected to thermal cycling at -40℃ / 30 minutes → 150℃ / 30 minutes (one cycle is 1 hour). After each thermal cycle, the appearance of the molded body was observed, and the number of thermal cycles until cracks appeared was measured. The average value of the 5 measurements was calculated.

[0131] [Table 3]

[0132]

[0133] [Table 4]

[0134]

[0135] [Table 5]

[0136]

[0137] As shown in Tables 3-5, the molded articles using the polyarylene sulfide resin compositions of Examples 1-9 exhibited improved thermal shock resistance compared to the molded articles of Comparative Examples 1-6. It is believed that by pulverizing the polyarylene sulfide resin composition in a manner that the glass flakes dispersed in the composition are within a specific range, and by including olefin copolymers and zeolites, the stress generated when exposed to hot and cold environments can be effectively dispersed, thus improving thermal shock resistance.

[0138] Explanation of reference numerals in the attached figures

[0139] L is the length of the rectangular steel bar.

[0140] W is the width of the rectangular steel bar.

[0141] H is the height of the rectangular steel bar.

[0142] 1. Rectangular steel

[0143] 2 Through hole

[0144] 3. Side view of the rectangular steel structure (resin flow direction from the two injection gates)

Claims

1. A polyarylene sulfide resin composition for injection-molded articles having welded portions, characterized in that, It is composed of polyarylene sulfide resin (A), olefin polymer (B), zeolite (C), glass fiber (D1), and glass flakes (D2), wherein the weight-average particle size of the glass flakes (D2) is in the range of 30 μm or more and 70 μm or less. The weight-average particle size of the glass flakes (D2) was determined by calcining the granules of the polyarylene sulfide resin composition at 550°C for 3 hours and measuring the particle size distribution of Ash using an acoustic / vibrational sieving method. The olefin polymer (B) comprises a copolymer of olefins, alkyl acrylates, and glycidyl acrylate. Relative to 100 parts by weight of polyarylene sulfide resin (A), the content of the olefin polymer (B) is 7-13 parts by weight, the content of the zeolite (C) is 1-7 parts by weight, the content of the glass fiber (D1) is 48-100 parts by weight, and the content of the glass flakes (D2) is 4-50 parts by weight.

2. The polyarylene sulfide resin composition according to claim 1, wherein it is a melt blend.

3. The polyarylether sulfide resin composition according to claim 1 or 2, wherein it is in granular form.

4. A molded article formed from the polyarylene sulfide resin composition according to any one of claims 1 to 3.

5. A method for manufacturing a polyarylene sulfide resin composition for an injection-molded article having a welded portion according to any one of claims 1 to 3, characterized in that, The process includes the following steps: melt-blending the polyarylene sulfide resin (A), olefin polymer (B), zeolite (C), glass fiber (D1), and glass flakes (D2) above the melting point of the polyarylene sulfide resin (A), wherein the weight-average particle size of the glass flakes (D2) is in the range of 30 μm or more and 70 μm or less. The weight-average particle size of the glass flakes (D2) was determined by calcining the granules of the polyarylene sulfide resin composition at 550°C for 3 hours and measuring the particle size distribution of Ash using an acoustic / vibrational sieving method. The olefin polymer (B) comprises a copolymer of olefins, alkyl acrylates, and glycidyl acrylate. Relative to 100 parts by weight of polyarylene sulfide resin (A), the content of the olefin polymer (B) is 7-13 parts by weight, the content of the zeolite (C) is 1-7 parts by weight, the content of the glass fiber (D1) is 48-100 parts by weight, and the content of the glass flakes (D2) is 4-50 parts by weight.

6. A method for manufacturing an injection-molded article having a welded portion, characterized in that, The process includes the following steps: a step of manufacturing a polyarylene sulfide resin composition by the manufacturing method of claim 5; and a step of melt-forming the obtained polyarylene sulfide resin composition.

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