Polyarylene sulfide resin composition, molded article, and method for producing same

Abstract

The present invention provides a polyarylene sulfide (PAS) molded article having an excellent balance between mechanical strength and sliding properties and high durability, a PAS resin composition capable of providing said molded article, and a method for producing the same. More specifically, the present invention provides a PAS resin composition comprising a PAS resin (A), a polyamide fiber (B), and a solid lubricant (C), characterized in that the melt viscosity (V6) of the PAS resin (A) is 50 to 2000 Pa s, the polyamide fiber (B) is blended in an amount of 5 to 35 parts by mass, and the solid lubricant (C) is blended in an amount of 5 to 30 parts by mass per 100 parts by mass of the PAS resin (A), and the weld tensile strength of a molded article in a dumbbell shape conforming to a type A test piece specified in ISO 20753, in which molten resin is filled symmetrically from both ends, is 40 MPa or more according to ISO 527-1, 2, and the molded article and the method for producing the same are characterized in that the melt viscosity (V6) of the PAS resin (A) is 50 to 2000 Pa s, the polyamide fiber (B) is blended in an amount of 5 to 35 parts by mass, and the solid lubricant (C) is blended in an amount of 5 to 30 parts by mass per 100 parts by mass of the PAS resin (A), and the weld tensile strength of the molded article is 40 MPa or more according to ISO 527-1, 2.

Description

[Technical field]

[0001] The present invention relates to a polyarylene sulfide resin composition, a polyarylene sulfide resin molded article, and a method for producing the same. [Background technology]

[0002] In recent years, in order to reduce the thickness and weight of robots, active research has been conducted into the use of resin gears, which were previously made of metal. For example, there is a growing need for high-heat-resistant engineering plastics with high melting points as sliding materials for gears, bearings, etc., as alternative materials to metals. However, when using resin materials for these applications, there are issues such as insufficient mechanical strength and sliding properties under high-load environments, and poor durability.

[0003] On the other hand, polyarylene sulfide resins (hereinafter, "PAS resins"), typified by polyphenylene sulfide resins (hereinafter, "PPS resins"), are widely used engineering plastics with excellent heat resistance, chemical resistance, etc. As a PAS resin with excellent sliding properties, for example, a sliding material obtained by compounding PPS with 5 to 50% by weight of a lubricant and 5 to 30% by weight of polyaramid fibers having an average fiber length of 1 to 25 mm has been disclosed (Patent Document 1). In addition, Patent Document 2 discloses a resin composition in which 100 parts by weight of PAS resin synthesized by polymerization reaction using an aromatic disulfide compound as a polymerization terminator is blended with 10 to 180 parts by weight of carbon fiber, wholly aromatic polyamide fiber, or glass fiber. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 162727 / 1983 [Patent Document 2] International Publication No. 2015 / 119123 Brochure Summary of the Invention [Problem to be solved by the invention]

[0005] However, the mechanical strength and sliding properties of PAS resin compositions obtained by conventional methods are insufficient for use as components in high-load environments, and further improvements are needed.

[0006] Therefore, the problem that the present invention aims to solve is to provide a PAS molded article that has an excellent balance between mechanical strength and sliding properties and also has high durability, a PAS resin composition that can provide such a molded article, and a method for producing the same. [Means for solving the problem]

[0007] As a result of intensive research aimed at solving the above problems, the inventors discovered that by blending a specified amount of polyamide fiber and a solid lubricant with a PAS resin, a good balance between mechanical strength and sliding properties and high durability can be achieved, and thus completed the present invention.

[0008] That is, the present disclosure provides a PAS resin composition comprising a PAS resin (A), a polyamide (hereinafter sometimes referred to as PA) fiber (B), and a solid lubricant (C), The PAS resin (A) at 300°C, load: 1.96 x 10 6 The melt viscosity (V6) measured after holding for 6 minutes at 100° C. for 6 minutes at 100° C. and L / D=10 (mm) / 1 (mm) is 50 to 2000 Pa s, and the PAS resin (A) is blended with 5 to 35 parts by mass of the PA fiber (B) and 5 to 30 parts by mass of the solid lubricant (C), This relates to a PAS resin composition characterized in that the tensile strength of the welds in a molded product obtained by filling a dumbbell-shaped test piece of type A specified in ISO 20753 with molten resin symmetrically from both ends is 40 MPa or more according to ISO 527-1, 2.

[0009] The present disclosure also relates to a PAS resin molded article obtained by molding the above-described PAS resin composition.

[0010] The present disclosure also relates to a sliding member made of the above-described molded article.

[0011] The present disclosure also provides a method for producing a PAS resin composition, comprising the steps of blending a PAS resin (A), PA fibers (B), and a solid lubricant (C), and melt-kneading the mixture at a temperature equal to or higher than the melting point of the PAS resin (A), The PAS resin (A) at 300°C, load: 1.96 x 10 6 The melt viscosity (V6) measured after holding for 6 minutes at 100° C. for 6 minutes at 100° C. and L / D=10 (mm) / 1 (mm) is 50 to 2000 Pa s, and the PAS resin (A) is blended with 5 to 35 parts by mass of the PA fiber (B) and 5 to 30 parts by mass of the solid lubricant (C), This relates to a method for producing a PAS resin composition, characterized in that the tensile strength of the welds in a molded product obtained by filling a dumbbell-shaped test piece of type A specified in ISO 20753 with molten resin symmetrically from both ends is 40 MPa or more according to ISO 527-1, 2.

[0012] The present disclosure also relates to a method for producing a molded article, comprising the steps of producing a PAS resin composition by the above-described production method and melt-molding the resulting PAS resin composition. Effect of the Invention

[0013] According to the present invention, it is possible to provide a PAS molded article having an excellent balance between mechanical strength and sliding properties and also high durability, a PAS resin composition capable of providing such a molded article, and a method for producing the same. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, embodiments of the present invention will be described in detail. However, the scope of the present invention is not limited to the embodiments described herein, and various modifications can be made without departing from the spirit of the present invention. Also, when a plurality of upper and lower limit values are described for a specific parameter, any upper limit value and lower limit value can be combined to form a suitable numerical range.

[0015] The PAS resin composition according to this embodiment is a PAS resin composition obtained by blending a PAS resin (A), a PA fiber (B), and a solid lubricant (C). The melt viscosity (V6) of the PAS resin (A) measured after holding for 6 minutes at 300 °C, load: 1.96×10 6 Pa, L / D = 10 (mm) / 1 (mm) is 50 to 2000 Pa·s, and 5 to 35 parts by mass of the PA fiber (B) and 5 to 30 parts by mass of the solid lubricant (C) are blended with respect to 100 parts by mass of the PAS resin (A). The following will be described.

[0016] <PAS resin (A)> The PAS resin composition according to this embodiment is obtained by blending a PAS resin as an essential component.

[0017] The PAS resin has a resin structure having a structure in which an aromatic ring and a sulfur atom are bonded as a repeating unit. Specifically, the following general formula (1)

[0018]

Chemical formula

[0019]

Chemical formula

[0020] Here, the structural portion represented by the general formula (1) is particularly R 1 and R 2 is preferably a hydrogen atom from the viewpoint of the mechanical strength of the PAS resin, and in that case, examples include those bonded at the para position represented by the following formula (3) and those bonded at the meta position represented by the following formula (4).

[0021] [ka] Among these, a structure in which the bond between the sulfur atom and the aromatic ring in the repeating unit is at the para position represented by the general formula (3) is particularly preferred in terms of the heat resistance and crystallinity of the PAS resin.

[0022] The PAS resin may include not only the structural moieties represented by the general formula (1) or (2) but also the structural moieties represented by the following structural formulae (5) to (8):

[0023] [ka] The structural moieties represented by the general formulae (1) and (2) may account for 30 mol % or less of the total of the structural moieties represented by the general formulae (1) and (2). In particular, in the present disclosure, it is preferable that the structural moieties represented by the general formulae (5) to (8) account for 10 mol % or less in terms of the heat resistance and mechanical strength of the PAS resin. When the PAS resin contains the structural moieties represented by the general formulae (5) to (8), the bonding mode thereof may be either a random copolymer or a block copolymer.

[0024] The PAS resin may have naphthyl sulfide bonds or the like in its molecular structure, but the amount of such bonds is preferably 3 mol % or less, and particularly preferably 1 mol % or less, relative to the total number of moles including other structural portions.

[0025] The physical properties of the PAS resin are not particularly limited as long as they do not impair the effects of the present invention, but are as follows.

[0026] (Melt Viscosity) The melt viscosity of the PAS resin used in this embodiment is not particularly limited, but in order to obtain a good balance between processability and mechanical strength, the melt viscosity (V6) measured at 300°C is preferably in the range of 2 Pa·s or more, and preferably in the range of 1000 Pa·s or less, more preferably in the range of 500 Pa·s or less, and further preferably in the range of 300 Pa·s or less. However, the melt viscosity (V6) is measured by using a Shimadzu flow tester, CFT-500D, at 300°C, load: 1.96×10 6 The melt viscosity is measured after holding the sample for 6 minutes at a pressure of 1 Pa and L / D = 10 (mm) / 1 (mm).

[0027] (Non-Newtonian Exponents) The non-Newtonian index of the PAS resin used in this embodiment is not particularly limited, but is preferably in the range of 0.90 or more to 2.00 or less. When a linear PAS resin is used, the non-Newtonian index is preferably in the range of 0.90 or more, more preferably in the range of 0.95 or more to preferably in the range of 1.50 or less, more preferably in the range of 1.20 or less. Such a PAS resin is excellent in mechanical properties, fluidity, and abrasion resistance. However, in this disclosure, the non-Newtonian index (N value) is a value calculated using the following formula by measuring the shear rate (SR) and shear stress (SS) using a capillograph under the conditions of melting point +20°C and the ratio of the orifice length (L) to the orifice diameter (D) L / D=40. The closer the non-Newtonian index (N value) is to 1, the closer the structure is to a linear structure, and the higher the non-Newtonian index (N value), the more branched the structure is.

[0028]

number

[0029] (Carboxyl group content) The carboxyl group content of the PAS resin used in this embodiment is preferably in the range of 10 μmol / g or more to 200 μmol / g or less, and more preferably in the range of 20 μmol / g or more to 180 μmol / g or less. In this range, the resin composition can have good processability and can obtain a molded product with excellent durability. In this disclosure, the carboxyl group content is a value measured by the method described in the examples.

[0030] (Manufacturing method) The method for producing the PAS resin is not particularly limited, but examples thereof include (Production Method 1) a method in which a dihalogenoaromatic compound is polymerized in the presence of sulfur and sodium carbonate, and if necessary, a polyhalogenoaromatic compound or other copolymerization component is added, (Production Method 2) a method in which a dihalogenoaromatic compound is polymerized in a polar solvent in the presence of a sulfidizing agent or the like, and if necessary, a polyhalogenoaromatic compound or other copolymerization component is added, (Production Method 3) a method in which p-chlorothiophenol is added, and if necessary, other copolymerization components are added, and self-condensation is performed, and (Production Method 4) a method in which a diiodoaromatic compound and elemental sulfur are melt-polymerized under reduced pressure in the presence of a polymerization inhibitor that may have a functional group such as a carboxyl group or an amino group. Among these methods, (Production Method 2) is preferred because it is versatile. During the reaction, an alkali metal salt of a carboxylic acid or sulfonic acid or an alkali hydroxide may be added to adjust the degree of polymerization. Among the above-mentioned (Production Method 2) methods, there is a method for producing a PAS resin by introducing a water-containing sulfidizing agent into a mixture containing a heated organic polar solvent and a dihalogeno aromatic compound at a rate at which water can be removed from the reaction mixture, and then reacting the dihalogeno aromatic compound and the sulfidizing agent in the organic polar solvent, and optionally adding a polyhalogeno aromatic compound, and controlling the amount of water in the reaction system to within a range of 0.02 to 0.5 mol per mol of the organic polar solvent (see JP-A-07-228699). Particularly preferred is a method in which a dihalogeno-aromatic compound and, if necessary, a polyhalogeno-aromatic compound or other copolymerization component are added in the presence of potassium metal sulfide and an aprotic polar organic solvent, and an alkali metal hydrosulfide and an organic acid alkali metal salt are reacted while controlling the organic acid alkali metal salt in the range of 0.01 to 0.9 mol per mol of the sulfur source and the amount of water in the reaction system to 0.02 mol or less per mol of the aprotic polar organic solvent (see WO2010 / 058713 pamphlet).Specific examples of the dihalogenoaromatic compound 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, 4,4'-dihalobenzophenone, 4,4'-di Examples of the polyhalogeno 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. The halogen atoms contained in the above compounds are preferably chlorine atoms or bromine atoms.

[0031] The method for post-treating the reaction mixture containing the PAS resin obtained by the polymerization step is not particularly limited, but for example, (post-treating 1) after the completion of the polymerization reaction, first, the solvent is distilled off under reduced pressure or normal pressure, either as is or after adding an acid or base, and then the solid matter remaining after the solvent distillation is washed once or twice or more times with a solvent such as water, the reaction solvent (or an organic solvent having a similar solubility to the low molecular weight polymer), acetone, methyl ethyl ketone, or alcohols, and then neutralized, washed with water, filtered, and dried; or (post-treating 2) after the completion of the polymerization reaction, the reaction mixture is dissolved in a solvent such as water, acetone, methyl ethyl ketone, alcohols, ethers, halogenated hydrocarbons, aromatic hydrocarbons, or aliphatic hydrocarbons (soluble in the polymerization solvent used and poorly soluble in at least PAS). (Post-treatment 3) after the polymerization reaction is completed, a reaction solvent (or an organic solvent having a solubility equivalent to that of the low molecular weight polymer) is added to the reaction mixture, the mixture is stirred, filtered to remove the low molecular weight polymer, washed once or twice or more with a solvent such as water, acetone, methyl ethyl ketone, or alcohols, and then neutralized, washed with water, filtered, and dried; (Post-treatment 4) after the polymerization reaction is completed, water is added to the reaction mixture, washed with water, filtered, and if necessary, acid is added during the water washing to perform acid treatment, and then dried; (Post-treatment 5) after the polymerization reaction is completed, the reaction mixture is filtered, and if necessary, washed once or twice or more with the reaction solvent, further washed with water, filtered, and dried. Among these methods, the (Post-treatment 4) method is preferred because it can obtain a PAS resin having a carboxyl group at the molecular end of the PAS resin.

[0032] In the post-treatment methods exemplified above in (Post-treatment 1) to (Post-treatment 5), the PAS resin may be dried in a vacuum, or in air or in an inert gas atmosphere such as nitrogen.

[0033] <Polyamide fiber (B)> The PAS resin composition according to this embodiment contains PA fibers (B) as an essential component.

[0034] The PA fiber (B) applicable to this embodiment is not particularly limited, and any known PA fiber made of PA resin can be used. In particular, fully aromatic PA fiber (aramid fiber) produced using one or more aromatic diamines and one or more aromatic dicarboxylic acid halides is preferred from the viewpoint of heat resistance and mechanical strength. Examples of aramid fiber include meta-aramid fiber and para-aramid fiber, among which para-aramid fiber is preferred, and copolymer para-aramid fiber represented by copolyparaphenylene-3,4'-oxydiphenylene-terephthalamide is particularly preferred.

[0035] The shape of the PA fiber (B) is not particularly limited as long as it is fibrous, and the fiber diameter, fiber length, aspect ratio, etc. can be appropriately adjusted depending on the application of the molded article, etc. From the viewpoint of exhibiting better mechanical strength, the average fiber length is preferably 0.1 mm or more, more preferably 0.5 mm or more, and is preferably 6 mm or less, more preferably 4 mm or less.

[0036] In the PAS resin composition according to the present embodiment, the amount of PA fiber (B) is preferably 5 parts by mass or more, more preferably 7 parts by mass or more, and preferably 35 parts by mass or less, more preferably 25 parts by mass or less, based on 100 parts by mass of PAS resin (A). In this range, the resin composition has good processability, and the molded product has excellent abrasion resistance, mechanical strength, and dimensional stability, which is preferable.

[0037] The PA fiber (B) may be treated with a surface treatment agent or a sizing agent, which is preferable because it can improve the adhesive strength with the PAS resin. Examples of the surface treatment agent or sizing agent include at least one polymer selected from the group consisting of silane compounds having functional groups such as amino groups, epoxy groups, isocyanate groups, and vinyl groups, titanate compounds, acrylic resins, urethane resins, ester resins, and epoxy resins.

[0038] <Solid Lubricant (C)> The PAS resin composition according to this embodiment contains a solid lubricant (C) as an essential component. In the present invention, the solid lubricant refers to a substance that is solid at room temperature (23° C.) and has a dynamic friction coefficient of 0.2 or less.

[0039] The solid lubricant that can be applied to this embodiment is not particularly limited and may be any known lubricant. For example, polytetrafluoroethylene (PTFE), polyethylene, graphite, boron nitride, molybdenum disulfide, carbon fiber, etc. are listed, and PTFE and polyethylene are particularly preferred from the viewpoints of sliding properties and processability.

[0040] In the PAS resin composition according to the present embodiment, the amount of the solid lubricant (C) is preferably 5 parts by mass or more, more preferably 8 parts by mass or more, and preferably 30 parts by mass or less, more preferably 25 parts by mass or less, based on 100 parts by mass of the PAS resin (A). In this range, the resin composition has good processability, and the molded product has excellent wear resistance and mechanical strength, which is preferable.

[0041] <Liquid silicone resin (D)> The PAS resin composition according to this embodiment may further contain a liquid silicone resin (D) as an optional component for the purpose of improving the abrasion resistance and reducing the coefficient of friction.

[0042] The liquid silicone resin applicable to this embodiment is not particularly limited, and any known silicone resin can be used as long as it is a silicone resin that is liquid at room temperature (23°C). Examples include dimethyl silicone and methylphenyl silicone. In addition, liquid silicone resins in which a part of the side chain, one end, or both ends are modified can be used. Examples of modified functional groups include amino groups, epoxy groups, carboxyl groups, carbinol groups, methacryl groups, fluorine groups, alkyl groups, alkylaralkyl groups, polyether groups, mercapto groups, phenol groups, and ester groups. In this embodiment, it is preferable to use unmodified dimethyl silicone, unmodified methylphenyl silicone, amino-modified dimethyl silicone, carboxy-modified dimethyl silicone, amino-modified methylphenyl silicone, and carboxy-modified methylphenyl silicone.

[0043] In addition, the liquid silicone resin that can be used in the resin composition according to this embodiment has a kinetic viscosity of 100 mm 2 / s or more is preferable, 500 mm 2 / s or more is more preferable, and 30,000 mm 2 / s or less is preferable, and 20000mm 2 / s or less is more preferable. In this range, the resin composition has good processability and the molded product has excellent abrasion resistance and mechanical strength, which is preferable. Note that the kinematic viscosity in the present disclosure is a value measured in accordance with JIS K2283-2000.

[0044] The PAS resin composition according to the present embodiment may contain a filler as an optional component within a range that does not impair the effects of the present invention. For example, fillers of various shapes, such as fibrous, plate-like, and powder-like, may be used. Specifically, glass fiber, carbon fiber, glass flakes, milled fiber, clay, pyrophyllite, bentonite, sericite, mica, talc, attapulgite, ferrite, calcium silicate, zeolite, boehmite, silica, quartz powder, glass beads, glass powder, calcium silicate, aluminum silicate, silicates such as diatomaceous earth, iron oxide, titanium oxide, zinc oxide, and alumina, metal carbonates such as calcium carbonate and magnesium carbonate, metal sulfates such as calcium sulfate and barium sulfate, fumed silica, silicon carbide, silicon nitride, boron nitride, various metal powders, and plant-derived fillers such as cocoa husk may be used alone or in combination in the present disclosure. Among them, hydrotalcite, calcium carbonate, talc, zinc carbonate, alumina, magnesium hydroxide, boron nitride, and magnesium carbonate can be preferably used. The size and aspect ratio can be appropriately adjusted depending on the application of the molded product.

[0045] In this embodiment, the filler is not an essential component, but when it is added, the amount of the filler is not particularly limited as long as it does not impair the effects of the present invention. The amount of the other filler is, for example, preferably 1 part by mass or more, more preferably 5 parts by mass or more, and preferably 600 parts by mass or less, more preferably 200 parts by mass or less, relative to 100 parts by mass of the PAS resin (A). In such a range, the resin composition shows good moldability and the molded product has excellent mechanical properties, which is preferable.

[0046] The PAS resin composition according to the present embodiment may contain a silane coupling agent as an optional component, if necessary. The silane coupling agent is not particularly limited as long as it does not impair the effects of the present invention, but a silane coupling agent having a functional group that reacts with a carboxyl group, such as an epoxy group, an isocyanato group, an amino group, or a hydroxyl group, is preferably used. Examples of such silane coupling agents include epoxy group-containing alkoxysilane compounds such as γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, and β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane; isocyanato group-containing alkoxysilane compounds such as γ-isocyanatopropyltrimethoxysilane, γ-isocyanatopropyltriethoxysilane, γ-isocyanatopropylmethyldimethoxysilane, γ-isocyanatopropylmethyldiethoxysilane, γ-isocyanatopropylethyldimethoxysilane, γ-isocyanatopropylethyldiethoxysilane, and γ-isocyanatopropyltrichlorosilane; amino group-containing alkoxysilane compounds such as γ-(2-aminoethyl)aminopropylmethyldimethoxysilane, γ-(2-aminoethyl)aminopropyltrimethoxysilane, and γ-aminopropyltrimethoxysilane; and hydroxyl group-containing alkoxysilane compounds such as γ-hydroxypropyltrimethoxysilane and γ-hydroxypropyltriethoxysilane. In the present invention, the silane coupling agent is not an essential component, but when it is added, the amount of the silane coupling agent is not particularly limited as long as it does not impair the effects of the present invention, and is preferably in the range of 0.01 parts by mass or more, more preferably 0.1 parts by mass or more, to preferably 10 parts by mass or less, more preferably 5 parts by mass or less, relative to 100 parts by mass of the PAS resin (A). In such a range, the resin composition has good corona resistance and moldability, especially releasability, and the mechanical strength of the molded product is improved, which is preferable.

[0047] The PAS resin composition according to the present embodiment may contain a thermoplastic elastomer as an optional component, if necessary. Examples of the thermoplastic elastomer include polyolefin elastomers, fluorine elastomers, and silicone elastomers, among which polyolefin elastomers are preferred. When these elastomers are added, the amount of the elastomers is not particularly limited as long as it does not impair the effects of the present invention, but is preferably in the range of 0.01 parts by mass or more, more preferably 0.1 parts by mass or more, to preferably 10 parts by mass or less, more preferably 5 parts by mass or less, based on 100 parts by mass of the PAS resin (A). In this range, the impact resistance of the resulting PAS resin composition is improved, which is preferable.

[0048] For example, the polyolefin-based elastomer may be a homopolymer of an α-olefin, a copolymer of two or more α-olefins, or a copolymer of one or more α-olefins and a vinyl polymerizable compound having a functional group. In this case, the α-olefin may be an α-olefin having 2 or more carbon atoms and 8 or less, such as ethylene, propylene, or 1-butene. In addition, the functional group may be a carboxyl group, an acid anhydride group (-C(=O)OC(=O)-), an epoxy group, an amino group, a hydroxyl group, a mercapto group, an isocyanate group, or an oxazoline group. Examples of the vinyl polymerizable compound having the functional group include one or more of vinyl acetate, α,β-unsaturated carboxylic acids such as (meth)acrylic acid, alkyl esters of α,β-unsaturated carboxylic acids such as methyl acrylate, ethyl acrylate, and butyl acrylate, metal salts of α,β-unsaturated carboxylic acids such as ionomers (metals include alkali metals such as sodium, alkaline earth metals such as calcium, and zinc), glycidyl esters of α,β-unsaturated carboxylic acids such as glycidyl methacrylate, and the like, α,β-unsaturated dicarboxylic acids such as maleic acid, fumaric acid, and itaconic acid, and derivatives of the α,β-unsaturated dicarboxylic acids (monoesters, diesters, and acid anhydrides). The above-mentioned thermoplastic elastomers may be used alone or in combination of two or more.

[0049] Furthermore, in addition to the above components, the PAS resin composition according to this embodiment may further contain synthetic resins such as polyester resin, PA resin, polyimide resin, polyetherimide resin, polycarbonate resin, polyphenylene ether resin, polysulfone resin, polyethersulfone resin, polyetheretherketone resin, polyetherketone resin, polyarylate resin, polyethylene resin, polypropylene resin, polytetrafluoroethylene resin, polydifluoroethylene resin, polystyrene resin, ABS resin, epoxy resin, phenol resin, urethane resin, and liquid crystal polymer as optional components depending on the application. In particular, it is preferable to add a fluorine-based resin because it improves the sliding properties. In the present invention, the synthetic resin is not an essential component, but when it is added, the ratio of the synthetic resin is not particularly limited as long as it does not impair the effects of the present invention, and it differs depending on each purpose and cannot be generally defined, but the ratio of the synthetic resin to be added in the resin composition according to this embodiment is, for example, in the range of 5 parts by mass or more and 15 parts by mass or less relative to 100 parts by mass of the PAS resin (A). In other words, the ratio of the PAS resin to the total of the PAS resin (A) and the synthetic resin is preferably in the range of (100 / 115) or more, and more preferably in the range of (100 / 105) or more, on a mass basis.

[0050] In addition, the PAS resin composition according to the present embodiment may contain other known and commonly used additives as optional components, such as colorants, antistatic agents, antioxidants, heat stabilizers, UV stabilizers, UV absorbers, foaming agents, flame retardants, flame retardant assistants, rust inhibitors, and release agents (metal salts or esters of fatty acids having 18 to 30 carbon atoms, including stearic acid or montanic acid, polyolefin waxes such as polyethylene, etc.) as needed. These additives are not essential components, and may be used in an amount of, for example, preferably 0.01 parts by mass or more, and preferably 1000 parts by mass or less, more preferably 100 parts by mass or less, based on 100 parts by mass of the PAS resin (A), as appropriate for the purpose or use so as not to impair the effects of the present invention.

[0051] In addition, the PAS resin composition of the present disclosure is characterized in that the weld strength is 40 MPa or more. Further, 45 MPa or more is preferable, and 50 MPa or more is more preferable. In such a range, the PAS resin molded product is excellent in durability. In order to achieve a range where the weld strength is applied, for example, a method of adjusting the melt viscosity (V6) of the PAS resin within the range of 50 to 2000 Pa·s according to the content rate of the PAS resin in the resin composition can be mentioned. For example, when a large amount of an inorganic filler is blended as a component other than the PAS resin, the crystallization rate of the resin composition tends to increase. Therefore, the melt viscosity of the PAS resin is increased to adjust the crystallization behavior. Note that the method for adjusting the weld strength is not limited to the above method. In addition, the weld strength in the present disclosure is the tensile strength of the welded portion in ISO 527-1, 2 of a molded product in which molten resin is filled symmetrically from both ends of a dumbbell shape conforming to a type A test piece defined in ISO 20753, and can be measured by the method described in the examples.

[0052] <Method for producing PAS resin composition> The method for producing a PAS resin composition according to the present embodiment is a method for producing a PAS resin composition having a step of blending a PAS resin (A), a liquid silicone resin (B), a PA fiber (C), and a solid lubricant (C) and melt-kneading at a temperature equal to or higher than the melting point of the PAS resin (A). The melt viscosity (V6) of the PAS resin (A) measured after holding for 6 minutes at 300 °C, load: 1.96×10 6 Pa, L / D = 10 (mm) / 1 (mm) is 50 to 2000 Pa·s, and 5 to 35 parts by mass of the PA fiber (B) and 5 to 30 parts by mass of the solid lubricant (C) are blended with respect to 100 parts by mass of the PAS resin (A). It is characterized in that the tensile strength of the welded portion in ISO 527-1, 2 of a molded product in which molten resin is filled symmetrically from both ends of a dumbbell shape conforming to a type A test piece defined in ISO 20753 is 40 MPa or more. Details will be described below.

[0053] The method for producing a PAS resin composition according to this embodiment includes a step of blending the essential components and melt-kneading them in a temperature range equal to or higher than the melting point of the PAS resin (A). More specifically, the PAS resin composition according to this embodiment is composed of the essential components and, if necessary, other optional components. There are no particular limitations on the method for producing the resin composition used in the present invention, but examples include a method of blending the essential components and, if necessary, the optional components, and melt-kneading them, and more specifically, a method of uniformly dry-mixing them, if necessary, in a tumbler or Henschel mixer, and then feeding them into a twin-screw extruder and melt-kneading them.

[0054] The melt kneading can be carried out by heating the resin to a temperature range in which the resin temperature is equal to or higher than the melting point of the PAS resin (A), preferably equal to or higher than the melting point + 10°C, more preferably equal to or higher than the melting point + 10°C, even more preferably equal to or higher than the melting point + 20°C, preferably equal to or lower than the melting point + 100°C, more preferably equal to or lower than the melting point + 50°C.

[0055] The melt kneader is preferably a twin-screw kneading extruder from the viewpoint of dispersibility and productivity. For example, it is preferable to melt knead while appropriately adjusting the resin component discharge amount in the range of 5 to 500 (kg / hr) and the screw rotation speed in the range of 50 to 500 (rpm), and it is more preferable to melt knead under the condition that the ratio (discharge amount / screw rotation speed) is in the range of 0.02 to 5 (kg / hr / rpm). In addition, each component may be added and mixed to the melt kneader simultaneously or in portions. For example, when adding the essential component PA fiber (B) among the components and other fibrous fillers as necessary, it is preferable to feed them into the extruder from the side feeder of the twin-screw kneading extruder from the viewpoint of dispersibility. The position of the side feeder is preferably such that the ratio of the distance from the extruder resin input part (top feeder) to the side feeder to the total screw length of the twin-screw kneading extruder is 0.1 or more, more preferably 0.3 or more. Moreover, the ratio is preferably 0.9 or less, and more preferably 0.7 or less.

[0056] The PAS resin composition according to this embodiment obtained by melt-kneading in this manner is a molten mixture containing the above essential components, optional components added as necessary, and their derived components. Therefore, the PAS resin composition according to this embodiment has a morphology in which the PAS resin (A) forms a continuous phase and other essential components and optional components are dispersed. That is, the PAS resin composition according to this embodiment has a sea-island structure in which island phases containing at least the solid lubricant (C) are dispersed in the continuous phase containing the PAS resin (A). As the average dispersion diameter of the solid lubricant (C), from the viewpoint of suppressing a decrease in mechanical strength, it is preferably 50 μm or less, more preferably 40 μm or less. The measurement method of the average dispersion diameter will be described in detail in the examples.

[0057] After the melt-kneading, the PAS resin composition according to this embodiment is preferably processed into forms such as pellets, chips, granules, and powders after extruding the resin composition in a molten state into strands by a known method, and then pre-dried in a temperature range of 100 to 150 °C as necessary.

[0058] <PAS Resin Molded Article, Method for Manufacturing PAS Resin Molded Article> The molded article according to this embodiment is obtained by melt-molding the PAS resin composition. Further, the method for manufacturing the molded article according to this embodiment has a step of melt-molding the PAS resin composition. Therefore, the molded article according to this embodiment has a morphology in which the PAS resin (A) forms a continuous phase and other essential components and optional components are dispersed. Since the PAS resin composition has such a morphology, a molded article excellent in thermal conductivity and mechanical strength can be obtained.

[0059] Moreover, the molded article according to this embodiment has a small dimensional change due to water absorption. Specifically, the dimensional change rate due to water absorption is preferably 0.2% or less, more preferably 0.15% or less, and even more preferably 0.1% or less. In general, the water absorption phenomenon of a resin is such that water penetrates into the amorphous part of the resin and the polymer chains swell, so the amount of water held between the polymer chains and the dimensional change are proportional to each other. Therefore, if the dimensional change rate due to water absorption is 0.2% or less, when the molded article according to this embodiment is used as, for example, a gear, the meshing of the teeth and the combination with other members are less likely to be affected, and the molded article according to this embodiment shows a better dimensional accuracy under high humidity or in water. That is, since the molded article according to this embodiment is composed of a PAS resin with low water absorption, the dimensional change rate due to water absorption is low and the molded article can have a better dimensional accuracy under high humidity. The dimensional change rate due to water absorption is a value measured by the method described in the Examples section below.

[0060] The PAS resin composition according to the present embodiment can be subjected to various molding processes such as injection molding, compression molding, extrusion molding of composites, sheets, pipes, pultrusion molding, blow molding, and transfer molding, but is particularly suitable for injection molding because of its excellent releasability. When molding by injection molding, various molding conditions are not particularly limited, and molding can be performed by a normal general method. For example, in an injection molding machine, the PAS resin composition is melted at a resin temperature in a temperature range of the melting point of the PAS resin (A) or higher, preferably in a temperature range of the melting point +10°C or higher, more preferably in a temperature range of the melting point +10°C to the melting point +100°C, and even more preferably in a temperature range of the melting point +20 to the melting point +50°C, and then the resin is injected into a mold from a resin discharge port and molded. At that time, the mold temperature may also be set to a known temperature range, for example, room temperature (23°C) to 300°C, preferably 130 to 190°C.

[0061] The method for producing a molded article according to this embodiment may include a step of annealing the molded article. The optimum conditions for the annealing treatment are selected depending on the application or shape of the molded article, and the annealing temperature is in a temperature range equal to or higher than the glass transition temperature of the PAS resin (A), preferably in a temperature range equal to or higher than the glass transition temperature +10°C, and more preferably in a temperature range equal to or higher than the glass transition temperature +30°C. On the other hand, it is preferably in a range of 260°C or lower, and more preferably in a range of 240°C or lower. The annealing time is not particularly limited, but is preferably in a range of 0.5 hours or higher, and more preferably in a range of 1 hour or higher. On the other hand, it is preferably in a range of 10 hours or lower, and more preferably in a range of 8 hours or lower. In such a range, not only the distortion of the molded article obtained is reduced and the crystallinity of the resin is improved, but also the thermal conductivity, mechanical properties, and fuel barrier properties are further improved, which is preferable. The annealing treatment may be performed in air, but is preferably performed in an inert gas such as nitrogen gas.

[0062] The PAS resin molded product according to this embodiment is characterized by excellent sliding characteristics such as wear resistance and low friction coefficient, and is therefore particularly suitable for use as a sliding part. Specifically, it can be used suitably for sliding parts such as gears, bearings, retainers, robot arms, bearings, ball valves, etc. The molded product according to this embodiment can be used not only as a sliding part, but also as a normal resin molded product such as the following. For example, a protective / supporting member for a box-shaped electric / electronic component integrated module, a plurality of individual semiconductors or modules, a sensor, an LED lamp, a connector, a socket, a resistor, a relay case, a switch, a coil bobbin, a capacitor, a variable capacitor case, an optical pickup, an oscillator, various terminal boards, a transformer, a plug, a printed circuit board, a tuner, a speaker, a microphone, a headphone, a small motor, a magnetic head base, a power module, a terminal block, a semiconductor, a liquid crystal, a FDD carriage, a FDD chassis, a motor brush holder, a parabolic antenna, a computer-related part, and other representative electric / electronic parts; a VTR part, a television part, an iron, a headphone, etc. Home and office electrical appliance parts such as air dryers, rice cooker parts, microwave oven parts, audio parts, audio / visual equipment parts such as laser discs, compact discs, DVD discs, and Blu-ray discs, lighting parts, refrigerator parts, air conditioner parts, typewriter parts, word processor parts, and water-related equipment parts such as water heaters, bath water volume and temperature sensors; office computer related parts, telephone related parts, facsimile related parts, copier related parts, cleaning jigs, motor parts, lighters, typewriters, and other machine related parts; optical equipment and precision machinery related parts such as microscopes, binoculars, cameras, and watches;Alternator terminals, alternator connectors, brush holders, slip rings, IC regulators, potentiometer bases for light dimmers, relay blocks, inhibitor switches, various valves such as exhaust gas valves, various pipes for fuel, exhaust and intake systems, air intake nozzle snorkels, intake manifolds, engine coolant joints, carburetor main bodies, carburetor spacers, exhaust gas sensors, coolant sensors, oil temperature sensors, brake pad wear sensors, throttle position sensors, crankshaft position sensors, temperature sensors, air flow meters, brake pad wear sensors, thermostat bases for air conditioners, heating hot air flow control valves, radiators Examples of automotive and vehicle related parts include brush holders for motors, water pump impellers, turbine vanes, wiper motor related parts, distributors, starter switches, ignition coils and bobbins, motor insulators, motor rotors, motor cores, starter relays, transmission wire harnesses, windshield washer nozzles, air conditioner panel switch boards, coils for fuel-related electromagnetic valves, fuse connectors, horn terminals, electrical component insulating plates, step motor rotors, lamp sockets, lamp reflectors, lamp housings, brake pistons, solenoid bobbins, engine oil filters, ignition device cases, and other various applications. EXAMPLES

[0063] The present invention will be described below using examples and comparative examples, but is not limited to these examples. In the following, unless otherwise specified, "%" and "parts" are based on mass.

[0064] <Examples 1 to 12 and Comparative Examples 1 to 9> Each material was mixed according to the composition and mixing amounts shown in Table 1. The mixed materials were then fed into a vented twin-screw extruder "TEX-30α (product name)" manufactured by Japan Steel Works, Ltd., and melt-kneaded at a resin component discharge rate of 30 kg / hr, a screw rotation speed of 200 rpm, and a set resin temperature of 320°C to obtain pellets of the resin composition. The glass fiber and polyamide fiber were fed from a side feeder (S / T ratio 0.5), and the other materials were mixed uniformly in a tumbler beforehand and fed from the top feeder. The pellets of the resin composition obtained were dried in a gear oven at 140°C for 2 hours, and then injection molded to produce various test pieces, and the following tests were performed.

[0065] <Evaluation>

[0066] (1) Measurement of dispersion diameter The pellets obtained in each Example and Comparative Example were fed to a Sumitomo Heavy Industries injection molding machine (SE-75D-HP) with a cylinder temperature set at 310°C, and injection molding was performed using an ISO D2 sheet piece molding die with a die temperature controlled at 140°C to obtain an ISO D2 sheet. The cross section of the sheet test piece was measured with an SEM device (JSM-6360A, manufactured by JEOL Ltd.). About 100 points of the phase (dispersed phase) made of solid lubricant were randomly selected from the obtained images, and the number average particle diameter of the particles was calculated. However, the particle diameter was calculated as a circle equivalent diameter. The results are shown in Tables 1 to 4.

[0067] (2) Measurement of tensile properties of welds The pellets obtained in each Example and Comparative Example were fed to a Sumitomo Heavy Industries injection molding machine (SE-75D-HP) with a cylinder temperature set to 310°C, and injection molding was performed using an ISO Type 1A dumbbell piece molding die with a die temperature controlled to 140°C to obtain an ISO Type-A dumbbell piece. The resin was injected from two gates to produce a test piece including a weld. The tensile strength of the obtained dumbbell piece was measured using a measurement method based on ISO 527-1 and 2. The results are shown in Tables 1 to 4.

[0068] (3) Measurement of Charpy impact strength Under the same conditions as in (2), resin was injected from a single gate to produce a dumbbell-shaped test piece that did not include a weld. The central portion of the dumbbell-shaped test piece was cut into a rod shape of 80 mm in length, 10 mm in width, and 4 mm in thickness, and notched to prepare an impact resistance test piece. A Charpy impact test was performed in accordance with ISO179-1 / 1eA to measure the impact strength (kJ / mm 2 The results are shown in Tables 1 to 4.

[0069] (4) Abrasion test The pellets obtained in each of the Examples and Comparative Examples were fed into a Sumitomo Heavy Industries injection molding machine (SE-75D-HP) with a cylinder temperature set at 310°C, and a cylindrical test piece with an inner diameter of 20 mm, an outer diameter of 25 mm, and a height of 15.0 mm was obtained using a mold with a temperature controlled at 140°C. The friction coefficient and specific wear rate [10 -3 [mm 3 The results are shown in Tables 1 to 4. Measurement conditions: The Suzuki abrasion test was carried out under the following measurement conditions: pressure: 150 KPa, rotation speed: 0.5 m / sec, measurement time: 60 minutes, temperature environment: 23° C., using two of the test pieces obtained by molding with an injection molding machine.

[0070] (5) Evaluation of durability of molded products The pellets obtained in each Example and Comparative Example were fed to a Sumitomo Heavy Industries injection molding machine (SE-75D-HP) with a cylinder temperature set to 310°C, and a gear with a module of 1 mm, 30 teeth, and a tooth thickness of 5 mm was obtained using a mold adjusted to 140°C, and was designated as Gear A. Similarly, a gear with a module of 1 mm, 31 teeth, and a tooth thickness of 5 mm was obtained, and was designated as Gear B. The obtained Gear A and Gear B were meshed, and a sliding test was performed in which the spur gears were rotated against each other under conditions of 25°C, torque of 1 Nm, and rotation speed of 1000 rpm, and the time until the gear broke was evaluated as the durability time. The results are shown in Tables 1 to 4.

[0071] (6) Evaluation of formability The appearance of the gear A of each example and comparative example obtained in (5) was visually observed, and those with a glossy surface and resin filled up to the tooth tip were determined to be good, and those without a glossy surface and resin not filled up to the tooth tip were determined to be defective. In addition, the tooth tip of the gear A was observed under a microscope to confirm the presence or absence of burrs of 0.1 mm or more. The results are shown in Tables 1 to 4.

[0072] (7) Measurement of dimensional change of gear due to water absorption The gear A of each example and comparative example obtained in (5) was dried at 50°C for 24 hours, and then cooled to room temperature (23°C) in a desiccator. The tooth tip diameter of the gear A after cooling was measured at 10 arbitrary locations on the teeth, and the number average value was taken as the tooth tip diameter (h0) of the gear A after drying. Then, it was immersed in distilled water at room temperature (23°C) for 30 days. The tooth tip diameter of the gear A after immersion was measured at 10 arbitrary locations, and the number average value was taken as the tooth tip diameter (h1) of the gear A after immersion. Using the obtained value, the change rate (%) of the tooth tip diameter before and after immersion was calculated from the formula {(h1-h0) / h0}×100 to be the dimensional change rate (%). The results are shown in Tables 1 to 4.

[0073] (8) Quantitative determination of carboxyl group content in PAS resin Each PPS resin used in each Example and Comparative Example was pressed at 350°C under a load of 10 MPa for 60 seconds, and then rapidly cooled to 25°C over 60 seconds to prepare a film exhibiting amorphous properties. The obtained film exhibiting amorphous properties was measured using a Fourier transform infrared spectrometer (hereinafter abbreviated as "FT-IR device"). In the infrared absorption spectrum, the peak at 630.6 cm -1 Absorbance at 1705cm -1The relative intensity of absorbance was obtained, and the content of carboxyl groups in the measurement sample (hereinafter abbreviated as "total content of carboxyl groups") was obtained using a calibration curve prepared by a method described later. The content of carboxyl groups is indicated by the number of moles in 1 g of the resin mixture, and its unit is expressed in [μmol / g]. The calibration curve was prepared by the following method. First, a predetermined amount of 4-chlorophenylacetic acid was added to a PAS resin prepared so as to contain a carboxylate at the molecular end without acid treatment, and mixed well. Then, a film similar to the above was prepared and measured with an FT-IR device. A calibration curve was prepared by plotting the relative intensity ratio of absorbance at the two wavelengths against the carboxyl group content calculated from the amount of 4-chlorophenylacetic acid added.

[0074] [Table 1]

[0075] [Table 2]

[0076] [Table 3]

[0077] [Table 4]

[0078] The blending ratios of the blended components in Tables 1 to 4 are as follows. ·PPS resin a-1: PPS resin (melt viscosity (V6) 20 Pa·s, carboxyl group amount 30 μmol / g) A-2: PPS resin (melt viscosity (V6) 50 Pa·s, carboxyl group amount 30 μmol / g) A-3: PPS resin (melt viscosity (V6) 120 Pa·s, carboxyl group amount 30 μmol / g) A-4: PPS resin (melt viscosity (V6) 2000 Pa·s, carboxyl group amount 20 μmol / g) a-5: PPS resin (melt viscosity (V6) 4000 Pa·s, carboxyl group amount 20 μmol / g)

[0079] Fiber fillers B-1: Polyamide fiber (para-aramid fiber, average fiber length 3 mm) b-2: Glass fiber "T-717H" manufactured by Nippon Electric Glass Co., Ltd., average fiber length 3.5 mm

[0080] Solid lubricants C-1: PTFE, Kitamura Co., Ltd. "KT-600M" (dynamic friction coefficient 0.04) C-2: Polyethylene, Mitsui Chemicals "Lubmer LY1040" (dynamic friction coefficient 0.15)

[0081] Liquid silicone resin D-1: Shin-Etsu Chemical Co., Ltd. "KF-96-1000CS" (kinetic viscosity 1000 mm 2 / s) D-2: Shin-Etsu Chemical Co., Ltd. "KF-10,000 CS" (dynamic viscosity 10,000 mm 2 / s)

[0082] ·Silane coupling material E-1: Dow Chemical Company "XIAMETER(R) OFS-6040"

[0083] From Tables 1 to 4, comparing the Examples with Comparative Examples 1 and 2, it was shown that when the melt viscosity of the resin is outside a specific range, the moldability and the durability of the gear are poor. Comparing the Examples with Comparative Examples 3 and 4, it was shown that when the blending amount of the PA fiber is outside a specific range, the mechanical properties, sliding properties, and dimensional change rate are deteriorated. Comparing the Examples with Comparative Examples 5 to 8, it was shown that when the blending amount of the solid lubricant is outside a specific range, the mechanical properties and sliding properties are poor. Comparing the Examples with Comparative Example 9, it was shown that when a fiber filler made of a material other than PA resin is used, the specific wear rate is large.

Claims

1. A polyarylene sulfide resin composition comprising a polyarylene sulfide resin (A), a polyamide fiber (B), and a solid lubricant (C), The polyarylene sulfide resin (A) at 300° C., load: 1.96×10 ６ the melt viscosity (V6) measured after holding for 6 minutes at a viscosity of 50 to 2000 Pa s and an L / D ratio of 10 (mm) / 1 (mm) is 50 to 2000 Pa s, the molecular structure of the polymer contains a carboxyl group, and the content of the functional group is 10 to 200 μmol / g, the polyamide fiber (B) is blended in an amount of 5 to 35 parts by mass and the solid lubricant (C) is blended in an amount of 5 to 30 parts by mass with respect to 100 parts by mass of the polyarylene sulfide resin (A); A polyarylene sulfide resin composition characterized in that a molded product obtained by filling a dumbbell-shaped test piece of type A specified in ISO 20753 with molten resin symmetrically from both ends has a tensile strength of 40 MPa or more at a weld portion according to ISO 527-1, 2.

2. 2. The polyarylene sulfide resin composition according to claim 1, wherein the solid lubricant (C) has a dispersed particle size of 50 μm or less.

3. The polyarylene sulfide resin composition according to claim 1 or 2, wherein the solid lubricant (C) contains polytetrafluoroethylene or polyethylene.

4. 3. The polyarylene sulfide resin composition according to claim 1, further comprising 1 to 5 parts by mass of a liquid silicone resin (D) per 100 parts by mass of the polyarylene sulfide resin (A).

5. The liquid silicone resin (D) has a kinetic viscosity of 100 to 30,000 mm ２ The polyarylene sulfide resin composition according to claim 5, wherein the polyarylene sulfide resin composition is a polyarylene sulfide resin composition having a molecular weight of 1:1 or less.

6. A molded article obtained by melt molding the polyarylene sulfide resin composition according to claim 1 or 2.

7. 3. A sliding member obtained by melt molding the polyarylene sulfide resin composition according to claim 1 or 2.

8. A gear obtained by melt molding the polyarylene sulfide resin composition according to claim 1 or 2.

9. A method for producing a polyarylene sulfide resin composition, comprising a step of blending a polyarylene sulfide resin (A), polyamide fibers (B), and a solid lubricant (C), and melt-kneading the blend at a temperature equal to or higher than the melting point of the polyarylene sulfide resin (A), The polyarylene sulfide resin (A) at 300° C., load: 1.96×10 ６ the melt viscosity (V6) measured after holding for 6 minutes at a viscosity of 50 to 2000 Pa s and an L / D ratio of 10 (mm) / 1 (mm) is 50 to 2000 Pa s, the molecular structure of the polymer contains a carboxyl group, and the content of the functional group is 10 to 200 μmol / g, the polyamide fiber (B) is blended in an amount of 5 to 35 parts by mass and the solid lubricant (C) is blended in an amount of 5 to 30 parts by mass with respect to 100 parts by mass of the polyarylene sulfide resin (A); A method for producing a polyarylene sulfide resin composition, characterized in that a molded product obtained by filling a dumbbell-shaped test piece conforming to a Type A test piece specified in ISO 20753 with molten resin symmetrically from both ends has a tensile strength of 40 MPa or more at a weld part according to ISO 527-1, 2.

10. The method for producing a polyarylene sulfide resin composition according to claim 9, wherein the solid lubricant (C) has a dispersed particle size of 50 μm or less.

11. The method for producing a polyarylene sulfide resin composition according to claim 9 or 10, wherein the solid lubricant (C) is polytetrafluoroethylene or polyethylene.

12. The method for producing a polyarylene sulfide resin composition according to claim 9 or 10, further comprising blending 1 to 10 parts by mass of a liquid silicone resin (D) with respect to 100 parts by mass of the polyarylene sulfide resin (A).

13. The liquid silicone resin (D) has a kinetic viscosity of 100 to 30,000 mm ２ The method for producing a polyarylene sulfide resin composition according to claim 12, wherein the polyarylene sulfide resin composition is a polyarylene sulfide resin composition having a molecular weight of 1:1 or less.

14. A method for producing a molded article, comprising a step of melt-molding a polyarylene sulfide resin composition obtained by the method for producing a polyarylene sulfide resin composition according to claim 9 or 10.