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

Abstract

Provided are: a polyarylene sulfide (PAS) molded article having an excellent balance between mechanical strength and sliding properties and having high durability; a PAS resin composition capable of providing the molded article; and methods for producing the PAS resin composition and the PAS resin composition. The present invention relates to a resin composition and a molded article, and more specifically, to a resin composition and a molded article obtained by blending a PAS resin (A), a polyamide fiber (B), and a solid lubricant (C), the resin composition being characterized in that the melt viscosity (V6) of the PAS resin (A) is 50-2000 Pa * s, and the melt viscosity (V6) of the PAS resin (A) is 50-2000 Pa * s, and the melt viscosity (V6) of the polyamide fiber (B) is 50-100 parts by mass per 100 parts by mass of the PAS resin (A). Mixing 5 to 35 parts by mass of the polyamide fiber (B) and 5 to 30 parts by mass of the solid lubricant (C); the tensile strength of a welded portion in ISO 527-1, 2 of a molded article obtained by filling a molten resin in bilateral symmetry from both ends of a dumbbell shape of a test piece of type A specified in ISO 20753 is 40 MPa or more.

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 Art

[0002] In recent years, for the purpose of thinning or lightening in robot development, research has been actively conducted to resinize gears that were conventionally made of metal. For example, engineering plastics with high heat resistance and high melting points are in increasing demand as metal substitute materials for sliding materials such as gears and bearings. However, when using resin materials for these applications, there are problems such as insufficient mechanical strength, sliding characteristics, and durability in a high-load environment.

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

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: Japanese Patent Laid-Open No. 63-162727

[0007] Patent Document 2: Pamphlet of International Publication No. 2015 / 119123 Summary of the Invention

[0008] Problems to be Solved by the Invention

[0009] However, the mechanical strength and sliding characteristics of the PAS resin composition obtained by conventional methods are insufficient for use as components in a high-load environment, and further improvement is required.

[0010] Therefore, the problem to be solved by the present invention is to provide a PAS molded article having an excellent balance between mechanical strength and sliding characteristics and high durability, a PAS resin composition capable of providing the molded article, and a method for producing the same.

[0011] Solutions to the Problems

[0012] The inventors of the present invention conducted in-depth research to solve the above problems and found that: relative to PAS resin, by compounding a specified amount of polyamide fiber and solid lubricant, the balance between mechanical strength and sliding characteristics is excellent, and high durability is achieved, thus completing the present invention.

[0013] That is, the present disclosure relates to a PAS resin composition, which is characterized in that it is a PAS resin composition compounded with a PAS resin (A), a polyamide (hereinafter sometimes referred to as PA) fiber (B), and a solid lubricant (C).

[0014] The melt viscosity (V6) of the said PAS resin (A) measured after holding at 300 °C, load: 1.96×10 6 Pa, L / D = 10 (mm) / 1 (mm) for 6 minutes is 50 to 2000 Pa·s, and

[0015] relative to 100 parts by mass of the said PAS resin (A), 5 to 35 parts by mass of the said PA fiber (B) and 5 to 30 parts by mass of the said solid lubricant (C) are compounded;

[0016] The tensile strength of the weld part in ISO 527-1, 2 of the molded product filled with molten resin symmetrically from both ends of the dumbbell shape of the test piece of type A specified in ISO20753 is 40 MPa or more.

[0017] In addition, the present disclosure relates to a PAS resin molded product formed by molding the above-described PAS resin composition.

[0018] In addition, the present disclosure relates to a sliding member comprising the above-described molded product.

[0019] In addition, the present disclosure relates to a method for manufacturing a PAS resin composition, which is characterized by having the following steps: a step of compounding a PAS resin (A), a PA fiber (B), and a solid lubricant (C) and performing melt-kneading at a temperature above the melting point of the PAS resin (A).

[0020] The melt viscosity (V6) of the said PAS resin (A) measured after holding at 300 °C, load: 1.96×10 6 Pa, L / D = 10 (mm) / 1 (mm) for 6 minutes is 50 to 2000 Pa·s, and

[0021] relative to 100 parts by mass of the said PAS resin (A), 5 to 35 parts by mass of the said PA fiber (B) and 5 to 30 parts by mass of the said solid lubricant (C) are compounded;

[0022] The tensile strength of the welded part in ISO 527-1, 2 of the molded product in which the molten resin is symmetrically filled from both ends of the dumbbell shape of the test piece of type A specified in ISO 20753 is 40 MPa or more.

[0023] In addition, the present disclosure relates to a method for manufacturing a molded product, which includes a step of manufacturing a PAS resin composition using the manufacturing method described above, and a step of melt-molding the obtained PAS resin composition.

[0024] Effects of the Invention

[0025] According to the present invention, a PAS molded product excellent in the balance between mechanical strength and sliding characteristics and having high durability, a PAS resin composition capable of providing the molded product, and a manufacturing method thereof can be provided. Detailed Description of Embodiments

[0026] 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 gist of the present invention. In addition, regarding specific parameters, when multiple upper limit values and lower limit values are described, any upper limit value and lower limit value within their upper limit values and lower limit values can be combined to set a suitable numerical range.

[0027] The PAS resin composition of the present embodiment is characterized in that it is a PAS resin composition prepared by compounding a PAS resin (A), a PA fiber (B), and a solid lubricant (C).

[0028] The melt viscosity (V6) of the PAS resin (A) measured after holding at 300 °C, load: 1.96×10 6 Pa, L / D = 10 (mm) / 1 (mm) for 6 minutes 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 compounded with respect to 100 parts by mass of the PAS resin (A). Hereinafter, an explanation will be given.

[0029] <PAS Resin (A)>

[0030] The PAS resin composition of the present embodiment is prepared by compounding a PAS resin as an essential component.

[0031] 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, it is a resin having a structural part represented by the following general formula (1) and, if necessary, a trifunctional structural part represented by the following general formula (2) as repeating units.

[0032] [Chemical Formula 1]

[0033]

[0034] (In formula (1), R 1 and R 2 each independently represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, a nitro group, an amino group, a phenyl group, a methoxy group, or an ethoxy group.)

[0035] [Chemical formula 2]

[0036]

[0037] For the trifunctional structural moiety represented by formula (2), it is preferably in the range of 0.001 to 3 mol%, particularly preferably in the range of 0.01 to 1 mol%, relative to the total molar amount of other structural moieties.)

[0038] Here, in terms of the mechanical strength of the PAS resin, the structural moiety represented by the general formula (1) is particularly preferably such that R 1 and R 2 are hydrogen atoms. In this case, examples include the para-bonded structural moiety shown in the following formula (3) and the meta-bonded structural moiety shown in the following formula (4).

[0039] [Chemical formula 3]

[0040]

[0041] Among these, in terms of the heat resistance and crystallinity of the PAS resin, it is particularly preferably a structure in which the bonding of the sulfur atom to the aromatic ring in the repeating unit is para-bonded as shown in the general formula (3).

[0042] In addition, the PAS resin may contain not only the structural moiety represented by the general formula (1) or (2), but also the structural moieties represented by the following structural formulas (5) to (8), and the content thereof is 30 mol% or less of the total of the structural moieties represented by the general formula (1) and (2).

[0043] [Chemical formula 4]

[0044]

[0045] In particular, in the present disclosure, in terms of the heat resistance and mechanical strength of the PAS resin, it is preferable that the structural moieties represented by the general formulas (5) to (8) are 10 mol% or less. When the PAS resin contains the structural moieties represented by the general formulas (5) to (8), their bonding mode can be either a random copolymer or a block copolymer.)

[0046] In addition, the PAS resin may also have a naphthalene thioether bond or the like in its molecular structure, but is preferably 3 mol% or less, particularly preferably 1 mol% or less, relative to the total number of moles of other structural parts.

[0047] In addition, as long as the effects of the present invention are not impaired, the physical properties of the PAS resin are not particularly limited, as described below.

[0048] (Melt viscosity)

[0049] The melt viscosity of the PAS resin used in this embodiment is not particularly limited. In terms of achieving 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. Here, the measurement of the melt viscosity (V6) is carried out on the PAS resin using a flow tester CFT-500D manufactured by Shimadzu Corporation, and is set to be the measured value of the melt viscosity after holding for 6 minutes at 300 °C, load: 1.96×10 6 Pa, L / D = 10 (mm) / 1 (mm).

[0050] (Non-Newtonian index)

[0051] The non-Newtonian index of the PAS resin used in this embodiment is not particularly limited, and is preferably in the range of 0.90 or more to 2.00 or less. In the case of using a linear PAS resin, 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 1.50 or less, and more preferably in the range of 1.20 or less. Such a PAS resin has excellent mechanical properties, fluidity, and abrasion resistance. Here, in the present disclosure, the non-Newtonian index (N value) is measured for the shear rate (SR) and shear stress (SS) using a capillary rheometer under the conditions of melting point + 20 °C and a ratio of hole length (L) to hole diameter (D) of L / D = 40, and is calculated using the following formula. The closer the non-Newtonian index (N value) is to 1, the closer it is to a linear structure, and the higher the non-Newtonian index (N value), the more branched the structure.

[0052] [Equation 1]

[0053] SR = K·SS N

[0054] [where SR represents the shear rate (per second -1 ), SS represents the shear stress (dyne / cm 2 ), and K represents a constant.]

[0055] (Carboxyl content)

[0056] In this embodiment, the carboxyl content of the PAS resin used is preferably in the range of 10 μmol / g or more and 200 μmol / g or less, more preferably in the range of 20 μmol / g or more and 180 μmol / g or less. Within the above range, the resin composition has good processability, and a molded article with excellent durability can be obtained. It should be noted that in this disclosure, the carboxyl content is a value obtained by measuring using the method described in the examples.

[0057] (Manufacturing method)

[0058] The method for producing the PAS resin is not particularly limited. For example, the following methods can be cited: (Production Method 1) A method in which a dihaloaromatic compound is polymerized in the presence of sulfur and sodium carbonate, and a polyhaloaromatic compound or other copolymer components are added as needed; (Production Method 2) A method in which a dihaloaromatic compound is polymerized in a polar solvent in the presence of a thioetherifying agent or the like, and a polyhaloaromatic compound or other copolymer components are added as needed; (Production Method 3) A method in which p-chlorothiophenol is self-condensed with other copolymer components added as needed; (Production Method 4) A method in which a diiodoaromatic compound and elemental sulfur are melt-polymerized while reducing the pressure in the presence of a polymerization inhibitor optionally having functional groups such as a carboxyl group and an amino group, etc. Among these methods, the method of (Production Method 2) is general and thus preferred. During the reaction, an alkali metal salt of a carboxylic acid, a sulfonic acid, or an alkali hydroxide may be added to adjust the degree of polymerization. In the method of (Production Method 2), those obtained by the following methods are particularly preferred: A method of introducing an aqueous thioetherifying agent into a mixture of a heated organic polar solvent and a dihaloaromatic compound at a rate that can remove water from the reaction mixture, reacting the dihaloaromatic compound and the thioetherifying agent with a polyhaloaromatic compound added as needed in the organic polar solvent, and controlling the amount of water in the reaction system to be in the range of 0.02 to 0.5 moles per mole of the organic polar solvent, thereby producing a PAS resin (refer to Japanese Patent Laid-Open No. 07-228699); or a method in which a dihaloaromatic compound is reacted with a polyhaloaromatic compound or other copolymer components added as needed in the presence of a solid alkali metal sulfide and an aprotic polar organic solvent, and the amount of an organic alkali metal salt of an alkali metal hydrosulfide and an organic acid is controlled to be in the range of 0.01 to 0.9 moles per mole of the sulfur source, and the amount of water in the reaction system is controlled to be 0.02 moles or less per mole of the aprotic polar organic solvent, and the reaction is carried out simultaneously (refer to WO2010 / 058713 brochure).Specific examples of the dihaloaromatic 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'-dihalodiphenyl sulfone, 4,4'-dihalodiphenyl sulfoxide, 4,4'-dihalodiphenyl sulfide, and compounds having an alkyl group with 1 to 18 carbon atoms on the aromatic ring of each of the above compounds. Specific examples of the polyhaloaromatic compound 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. In addition, the halogen atom contained in each of the above compounds is preferably a chlorine atom or a bromine atom.

[0059] The post-treatment method of the reaction mixture containing the PAS resin obtained through the polymerization step is not particularly limited. For example, it includes: (Post-treatment 1) After the polymerization reaction is completed, first, the reaction mixture is directly distilled under reduced pressure or normal pressure to remove the solvent, or after adding an acid or a base, and then the solid substance after the solvent is distilled off is washed one or more times with water, a reaction solvent (or an organic solvent having an equivalent solubility to the low molecular polymer), acetone, methyl ethyl ketone, alcohols, etc., and then neutralized, washed with water, filtered, and dried; or (Post-treatment 2) After the polymerization reaction is completed, a solvent such as water, acetone, methyl ethyl ketone, alcohols, ethers, halogenated hydrocarbons, aromatic hydrocarbons, aliphatic hydrocarbons, etc. (a solvent soluble in the polymerization solvent used and at least a poor solvent for PAS) is added to the reaction mixture as a precipitant to precipitate solid products such as PAS and inorganic salts, and they are filtered, separated, washed, and dried; or (Post-treatment 3) After the polymerization reaction is completed, a reaction solvent (or an organic solvent having an equivalent solubility to the low molecular polymer) is added to the reaction mixture and stirred, and then filtered to remove the low molecular weight polymer, and then washed one or more times with water, acetone, methyl ethyl ketone, alcohols, etc., 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 for water washing and filtering, and if necessary, an acid is added during water washing for acid treatment and then dried; (Post-treatment 5) After the polymerization reaction is completed, the reaction mixture is filtered, and if necessary, washed one or more times with a reaction solvent, and then washed with water, filtered, and dried, etc. Among these methods, the method of (Post-treatment 4) can obtain a PAS resin having a carboxyl group at the molecular end of the PAS resin, and is therefore preferred.

[0060] It should be noted that in the post-treatment methods exemplified by the above (post-treatment 1) to (post-treatment 5), the drying of the PAS resin can be carried out in a vacuum, or in air or in an inert gas atmosphere such as nitrogen.

[0061] <Polyamide fiber (B)>

[0062] The PAS resin composition of the present embodiment is compounded with PA fiber (B) as an essential component.

[0063] The PA fiber (B) applicable to the present embodiment is not particularly limited, and any known fiber can be used as long as it is a fiber containing a PA resin. From the viewpoints of heat resistance and mechanical strength, it is particularly preferable to use an all-aromatic PA fiber (aramid fiber) produced from one or more aromatic diamines and one or more aromatic dicarboxylic acid halides. Examples of aramid fibers include meta-aramid fibers and para-aramid fibers. Among them, para-aramid fibers are preferred, and a copolymerized para-aramid fiber represented by copoly(p-phenylene-3,4'-oxydiphenylene-p-phthalamide) is particularly preferred.

[0064] Regarding the shape of the PA fiber (B), as long as it is fibrous, it is not particularly limited, and the fiber diameter, fiber length, and aspect ratio can be appropriately adjusted according to the use of the molded article. From the viewpoint of exhibiting more excellent mechanical strength, the average fiber length is preferably 0.1 mm or more, more preferably 0.5 mm or more, and preferably 6 mm or less, more preferably 4 mm or less.

[0065] In the PAS resin composition of the present embodiment, the compounding amount of the PA fiber (B) is preferably in the range of 5 parts by mass or more, more preferably 7 parts by mass or more to 35 parts by mass or less, more preferably 25 parts by mass or less, based on 100 parts by mass of the PAS resin (A). Within the above range, the resin composition has good processability, and the molded article has excellent abrasion resistance, mechanical strength, and dimensional stability, so it is preferred.

[0066] In addition, the PA fiber (B) can also be one processed with a surface treatment agent or a bundling agent. Thereby, the adhesion to the PAS resin can be improved, so it is preferred. Examples of the surface treatment agent or bundling agent include at least one polymer selected from the group consisting of silane compounds, titanate compounds, acrylic resins, urethane resins, ester resins, and epoxy resins having functional groups such as amino, epoxy, isocyanate, and vinyl groups.

[0067] <Solid lubricant (C)>

[0068] The PAS resin composition of the present embodiment is compounded with a solid lubricant (C) as an essential component. In the present invention, the so-called solid lubricant refers to a substance that is solid at normal temperature (23°C) and has a dynamic friction coefficient of 0.2 or less.

[0069] The solid lubricant applicable to the present embodiment is not particularly limited, and known solid lubricants can be used. For example, polytetrafluoroethylene (PTFE), polyethylene, graphite, boron nitride, molybdenum disulfide, carbon fiber, etc. can be cited. In particular, from the viewpoints of slidability and processability, PTFE and polyethylene are preferred.

[0070] In the PAS resin composition of the present embodiment, relative to 100 parts by mass of the PAS resin (A), the compounding amount of the solid lubricant (C) is preferably in the range of 5 parts by mass or more, more preferably 8 parts by mass or more, to preferably 30 parts by mass or less, more preferably 25 parts by mass or less. Within the above range, the resin composition has good processability, and the molded product has excellent abrasion resistance and mechanical strength, so it is preferred.

[0071] <Liquid silicone resin (D)>

[0072] For the purpose of improving abrasion resistance and reducing the friction coefficient, the PAS resin composition of the present embodiment may also be compounded with a liquid silicone resin (D) as an optional component.

[0073] The liquid silicone resin applicable to the present embodiment is not particularly limited as long as it is a silicone resin that is liquid at normal temperature (23°C), and known liquid silicone resins can be used. For example, dimethyl silicone, methylphenyl silicone can be cited. In addition, liquid silicone resins modified at a part of the side chain, single terminal, or both terminals can be used. As the modifying functional group, for example, amino group, epoxy group, carboxyl group, methanol group, methacrylic acid group, fluorine group, alkyl group, alkyl aralkyl group, polyether group, mercapto group, phenol group, ester group can be cited. In the present embodiment, unmodified dimethyl silicone, unmodified methylphenyl silicone, amino-modified dimethyl silicone, carboxyl-modified dimethyl silicone, amino-modified methylphenyl silicone, and carboxyl-modified methylphenyl silicone are preferably used.

[0074] In addition, the kinematic viscosity of the liquid silicone resin applicable to the resin composition of the present embodiment is preferably 100 mm 2 / s or more, more preferably 500 mm 2 / s or more. In addition, it is preferably 30000 mm 2 / s or less, more preferably 20000 mm 2 / s or less. Within the above range, the resin composition has good processability, and the molded article has excellent abrasion resistance and mechanical strength, so it is preferred. It should be noted that the kinematic viscosity of the present disclosure is a value measured in accordance with JIS K2283-2000.

[0075] Regarding the PAS resin composition of the present embodiment, a filler can be compounded as an optional component within the range that does not impair the effects of the present invention. For example, fillers in various shapes such as fibrous, plate-like, powdery, and granular can be mentioned. Specifically, examples include: glass fiber, carbon fiber, glass flake, milled fiber, clay, pyrophyllite, bentonite, sericite, mica, talc, palygorskite, ferrite, calcium silicate, zeolite, boehmite, silica, quartz powder, glass beads, glass powder, calcium silicate, aluminum silicate, diatomaceous earth and other silicates, iron oxides, titanium oxides, zinc oxides, aluminum oxide and other metal oxides, calcium carbonate, magnesium carbonate and other metal carbonates, calcium sulfate, barium sulfate and other metal sulfates, fumed silica, and silicon carbide, silicon nitride, boron nitride, various metal powders, plant-derived fillers such as cocoa husks, etc. In the present disclosure, one of these can be used or two or more can be used in combination. Among them, hydrotalcite, calcium carbonate, talc, zinc carbonate, aluminum oxide, magnesium hydroxide, boron nitride, and magnesium carbonate can be preferably used. Their size and aspect ratio can be appropriately adjusted according to the use of the molded article, etc.

[0076] In the present embodiment, the filler is not an essential component. When compounded, as long as the effects of the present invention are not impaired, its compounding amount is not particularly limited. As the compounding amount of other fillers, for example, relative to 100 parts by mass of the PAS resin (A), it is preferably in the range of 1 part by mass or more, more preferably 5 parts by mass or more to preferably 600 parts by mass or less, more preferably 200 parts by mass or less. Within the above range, the resin composition exhibits good formability, and the mechanical properties of the molded article are excellent, so it is preferred.

[0077] The PAS resin composition of the present embodiment may incorporate a silane coupling agent as an optional component as needed. As the silane coupling agent, there is no particular limitation as long as the effects of the present invention are not impaired. Preferred silane coupling agents include those having a functional group reactive with a carboxyl group, such as an epoxy group, an isocyanate group, an amino group, or a hydroxyl group. Examples of such silane coupling agents include alkoxysilane compounds containing an epoxy group such as γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane; alkoxysilane compounds containing an isocyanate group such as γ-isocyanatopropyltrimethoxysilane, γ-isocyanatopropyltriethoxysilane, γ-isocyanatopropylmethyldimethoxysilane, γ-isocyanatopropylmethyldiethoxysilane, γ-isocyanatopropylethyldimethoxysilane, γ-isocyanatopropylethyldiethoxysilane, γ-isocyanatopropyltrichlorosilane; alkoxysilane compounds containing an amino group such as γ-(2-aminoethyl)aminopropylmethyldimethoxysilane, γ-(2-aminoethyl)aminopropyltrimethoxysilane, γ-aminopropyltrimethoxysilane; and alkoxysilane compounds containing a hydroxyl group such as γ-hydroxypropyltrimethoxysilane, γ-hydroxypropyltriethoxysilane. In the present invention, the silane coupling agent is not an essential component. When incorporated, there is no particular limitation on its incorporation amount as long as the effects of the present invention are not impaired. Relative to 100 parts by mass of the PAS resin (A), it is preferably 0.01 part by mass or more, more preferably 0.1 part by mass or more to preferably 10 parts by mass or less, and more preferably 5 parts by mass or less. Within the above range, the resin composition has good corona resistance and moldability, especially demoldability, and the mechanical strength of the molded article is improved, so it is preferred.

[0078] The PAS resin composition of the present embodiment may incorporate a thermoplastic elastomer as an optional component as needed. Examples of the thermoplastic elastomer include polyolefin-based elastomers, fluorine-based elastomers, or silicone-based elastomers, and among them, polyolefin-based elastomers are preferred. When these elastomers are added, there is no particular limitation on their incorporation amount as long as the effects of the present invention are not impaired. Relative to 100 parts by mass of the PAS resin (A), it is preferably 0.01 part by mass or more, more preferably 0.1 part by mass or more to preferably 10 parts by mass or less, and more preferably 5 parts by mass or less. Within the above range, the impact resistance of the obtained PAS resin composition is improved, so it is preferred.

[0079] For example, the polyolefin-based elastomers may include: homopolymers of α-olefins, or copolymers of two or more α-olefins, and copolymers of one or two or more α-olefins and vinyl polymerizable compounds having functional groups. At this time, examples of the α-olefins include α-olefins having 2 to 8 carbon atoms such as ethylene, propylene, and 1-butene. In addition, examples of the functional groups include: carboxyl group, acid anhydride group (-C(=O)OC(=O)-), epoxy group, amino group, hydroxyl group, mercapto group, isocyanate group, oxazoline group, etc. Moreover, examples of the vinyl polymerizable compounds having the functional groups include: 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 (as the metal, alkali metals such as sodium, alkaline earth metals such as calcium, zinc, etc.); glycidyl esters of α,β-unsaturated carboxylic acids such as glycidyl methacrylate; α,β-unsaturated dicarboxylic acids such as maleic acid, fumaric acid, and itaconic acid; derivatives (monoesters, diesters, acid anhydrides) of the α,β-unsaturated dicarboxylic acids, etc., one or more of these. The thermoplastic elastomers may be used alone or in combination of two or more.

[0080] Furthermore, in addition to the above components, the PAS resin composition of the present embodiment may further appropriately blend synthetic resins (hereinafter, simply referred to as synthetic resins) such as polyester resins, PA resins, polyimide resins, polyetherimide resins, polycarbonate resins, polyphenylene ether resins, polysulfone resins, polyethersulfone resins, polyetheretherketone resins, polyetherketone resins, polyarylate resins, polyethylene resins, polypropylene resins, polytetrafluoroethylene resins, polyvinylidene fluoride resins, polystyrene resins, ABS resins, epoxy resins, phenolic resins, urethane resins, liquid crystal polymers, etc. as optional components according to the use. Especially when blending fluorine-based resins, the slidability is further improved, so it is preferred. In the present invention, the synthetic resin is not an essential component. When blending, as long as the effects of the present invention are not impaired, the blending ratio is not particularly limited, and it varies according to each purpose and cannot be generally specified. However, as the blending ratio of the synthetic resin in the resin composition of the present embodiment, for example, it may be in the range of 5 parts by mass or more and 15 parts by mass or less with respect to 100 parts by mass of the PAS resin (A). In other words, with respect to the total of the PAS resin (A) and the synthetic resin, the ratio of the PAS resin is preferably in the range of (100 / 115) or more, more preferably in the range of (100 / 105) or more, based on mass.

[0081] In addition, the PAS resin composition of the present embodiment may, as required, further incorporate known and commonly used additives such as colorants, antistatic agents, antioxidants, heat stabilizers, ultraviolet stabilizers, ultraviolet absorbers, foaming agents, flame retardants, flame retardant aids, rust inhibitors, and mold 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 optional components. These additives are not essential components. For example, relative to 100 parts by mass of the PAS resin (A), it is preferably in the range of 0.01 part by mass or more, and preferably 1000 parts by mass or less, more preferably 100 parts by mass or less, and still more preferably 10 parts by mass or less, and can be appropriately adjusted and used according to the purpose or application as long as the effects of the present invention are not impaired.

[0082] In addition, the PAS resin composition of the present disclosure is characterized in that the welding strength is 40 MPa or more. Additionally, it is preferably 45 MPa or more, and more preferably 50 MPa or more. Within the above range, the durability of the PAS resin molded article is excellent. In order to bring the welding strength within the above range, for example, there is 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 ratio of the PAS resin in the resin composition. For example, when a large amount of inorganic filler as a component other than the PAS resin is compounded, the crystallization rate of the resin composition tends to increase, so the melt viscosity of the PAS resin is increased to adjust the crystallization behavior. It should be noted that the method of adjusting the welding strength is not limited to the above method. In addition, the welding strength in the present disclosure is the tensile strength of the welded part in ISO 527-1,2 of a molded article in which molten resin is symmetrically filled from both ends of the dumbbell shape of a type A test piece specified in ISO 20753, and can be measured by the method described in the examples.

[0083] <Manufacturing method of PAS resin composition>

[0084] The manufacturing method of the PAS resin composition of the present embodiment is characterized by having the following steps: a step of compounding the PAS resin (A), the liquid silicone resin (B), the PA fiber (C), and the solid lubricant (C), and performing melt-kneading at a temperature above the melting point of the PAS resin (A).

[0085] The melt viscosity (V6) of the PAS resin (A) measured after holding at 300 °C, load: 1.96×10 6 Pa, L / D = 10 (mm) / 1 (mm) for 6 minutes is 50 to 2000 Pa·s, and

[0086] Per 100 parts by mass of the PAS resin (A), 5 to 35 parts by mass of the PA fiber (B) and 5 to 30 parts by mass of the solid lubricant (C) are compounded.

[0087] The tensile strength of the weld part in ISO 527-1, 2 of the molded article in which the molten resin is symmetrically filled from both ends of the dumbbell shape of the test piece of type A specified in ISO20753 is 40 MPa or more. The following will be described in detail.

[0088] The manufacturing method of the PAS resin composition of the present embodiment has a step of compounding the above-mentioned essential components and performing melt-kneading in a temperature range above the melting point of the PAS resin (A). More specifically, the PAS resin composition of the present embodiment is compounded with each essential component and other optional components as needed. As a method for manufacturing the resin composition used in the present invention, there is no particular limitation, and examples thereof include a method of compounding essential components and optional components as needed and performing melt-kneading, and more specifically, a method of uniformly performing dry mixing using a drum mixer or a Henschel mixer as needed, and then charging it into a twin-screw extruder for melt-kneading.

[0089] The melt-kneading can be carried out by heating to a temperature range in which the resin temperature is above the melting point of the PAS resin (A), preferably in a temperature range of the melting point + 10°C or more, more preferably the melting point + 10°C or more, further preferably the melting point + 20°C or more to preferably the melting point + 100°C or less, more preferably the melting point + 50°C or less.

[0090] As the melt-kneading machine, from the viewpoint of dispersibility or productivity, a twin-screw kneading extruder is preferred. For example, it is preferred to perform melt-kneading while appropriately adjusting the range of the discharge amount of the resin component of 5 to 500 (kg / hr) and the range of the screw rotation speed of 50 to 500 (rpm), and further preferably to perform melt-kneading under the condition that the ratio (discharge amount / screw rotation speed) thereof is in the range of 0.02 to 5 (kg / hr / rpm). In addition, the addition and mixing of each component into the melt-kneading machine can be carried out simultaneously or separately. For example, in the case of adding the PA fiber (B) as an essential component among the above-mentioned components or other fibrous fillers as needed, from the viewpoint of dispersibility, it is preferred to feed it into the extruder from the side feeder of the twin-screw kneading extruder. Regarding the position of the side feeder, the ratio of the distance from the resin charging part (top feeder) of the extruder to the side feeder to the total length of the screw of the twin-screw kneading extruder is preferably 0.1 or more, more preferably 0.3 or more. In addition, the ratio is preferably 0.9 or less, more preferably 0.7 or less.

[0091] The PAS resin composition of the present embodiment obtained by melt-kneading in this manner is a melt mixture containing the above-described essential components, optional components added as needed, and components derived therefrom. Therefore, the PAS resin composition of the present embodiment has a morphology in which the PAS resin (A) forms a continuous phase and other essential components or optional components are dispersed therein. That is, the PAS resin composition of the present embodiment has a sea-island structure in which an island phase containing at least the solid lubricant (C) is dispersed in the continuous phase containing the PAS resin (A). The average dispersion diameter of the solid lubricant (C) is preferably 50 μm or less, more preferably 40 μm or less, from the viewpoint of suppressing a decrease in mechanical strength. It should be noted that the method for measuring the average dispersion diameter is described in detail in the examples.

[0092] After the melt-kneading, the PAS resin composition of the present embodiment is preferably processed by a known method. For example, after extruding the molten resin composition into a strand shape, it is processed into forms such as pellets, chips, granules, and powders, and then pre-dried in a temperature range of 100 to 150°C as needed.

[0093] <PAS resin molded article, method for manufacturing PAS resin molded article>

[0094] The molded article of the present embodiment is obtained by melt-molding the PAS resin composition. In addition, the method for manufacturing the molded article of the present embodiment includes a step of melt-molding the PAS resin composition. Therefore, the molded article of the present embodiment has a morphology in which the PAS resin (A) forms a continuous phase and other essential components or optional components are dispersed therein. By having the above-described morphology of the PAS resin composition, a molded article having excellent thermal conductivity and mechanical strength can be obtained.

[0095] In addition, the change in the size of the molded article of the present embodiment due to water absorption is small. Specifically, the size 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. Generally, the water absorption phenomenon of a resin is a phenomenon in which water penetrates into the amorphous part of the resin and the polymer chains swell, so there is a proportional relationship between the amount of water retained between the polymer chains and the size change. Therefore, if the size change rate due to water absorption is 0.2% or less, when the molded article of the present embodiment is used as a gear, for example, it is less likely to affect the meshing between tooth parts or the combination with other components, and shows more excellent dimensional accuracy under high humidity or in water. That is, since the molded article of the present embodiment uses a PAS resin with low water absorption as a constituent component, the size change rate due to water absorption is low, and it can have excellent dimensional accuracy under high humidity. It should be noted that the size change rate due to water absorption is a value measured by the method described in the examples section below.

[0096] The PAS resin composition of the present embodiment can be used for various molding processes such as injection molding, compression molding, composite molding, sheet extrusion molding, tube extrusion molding, drawing molding, blow molding, and transfer molding. In particular, due to its more excellent demolding property, it is suitable for injection molding applications. When molding by injection molding, various molding conditions are not particularly limited, and generally, molding can be carried out by a general method. For example, in an injection molding machine, after melting the PAS resin composition in a temperature range above the melting point of the PAS resin (A), preferably in a temperature range of the melting point + 10°C or more, more preferably in a temperature range of the melting point + 10°C to the melting point + 100°C, and further preferably in a temperature range of the melting point + 20°C to the melting point + 50°C, it can be injected into a mold from a resin nozzle for molding. At this time, the mold temperature only needs to be set within a known temperature range, such as room temperature (23°C) to 300°C, preferably 130 to 190°C.

[0097] The manufacturing method of the molded article of the present embodiment may also include a step of annealing the molded article. The annealing treatment selects the optimal conditions according to the use or shape of the molded article, etc. The annealing temperature is in a temperature range above the glass transition temperature of the PAS resin (A), preferably in a temperature range of the glass transition temperature + 10°C or more, more preferably in a temperature range of the glass transition temperature + 30°C or more. On the other hand, it is preferably in a range of 260°C or less, more preferably in a range of 240°C or less. The annealing time is not particularly limited, preferably in a range of 0.5 hours or more, more preferably in a range of 1 hour or more. On the other hand, it is preferably in a range of 10 hours or less, more preferably in a range of 8 hours or less. Within the above range, not only the strain of the obtained molded article is reduced, but also the crystallinity of the resin is improved, and the thermal conductivity, mechanical properties, and fuel barrier properties are further improved, so it is preferred. The annealing treatment can be carried out in air, but it is preferably carried out in an inert gas such as nitrogen.

[0098] The PAS resin molded article of the present embodiment is characterized by excellent sliding properties such as abrasion resistance and low coefficient of friction, and is therefore preferably used particularly in applications of sliding parts. Specifically, it can be preferably used for sliding parts such as gears, supports, retainers, robotic arms, bearings, ball valves, etc. In addition, the molded article of the present embodiment can be used not only as a sliding part, but also as a general resin molded article as follows. For example, it can be cited: protective / supporting parts for box-type electrical / electronic component integrated modules / multiple independent semiconductors or modules, sensors, LED lights, connectors, sockets, resistors, relay housings, switches, bobbin, capacitors, varistor housings, optical pickups, oscillators, various terminal boards, transformers, plugs, printed circuit boards, tuners, speakers, microphones, headphones, small motors, head bases, power modules, terminal blocks, semiconductors, liquid crystals, FDD carriers, FDD chassis, motor brush holders, parabolic antennas, computer-related parts, etc. represented by electrical / electronic components; VTR parts, TV parts, irons, hair dryers, rice cooker parts, microwave oven parts, audio parts, audio / video equipment parts such as audio / laser disc / optical disc / DVD / Blu-ray disc, lighting parts, refrigerator parts, air conditioner parts, typewriter parts, word processor parts, or water-related equipment parts such as hot water quantity and temperature sensors of water heaters or bathtubs, etc. represented by household and office electrical product parts; office computer-related parts, telephone-related parts, fax machine-related parts, copier-related parts, cleaning jigs, motor parts, writers, typewriters, etc. represented by mechanical-related parts; optical equipment and precision machinery-related parts such as microscopes, binoculars, cameras, watches, etc.; various automotive / vehicle-related parts such as alternator terminals, alternator connectors, brush holders, slip rings, integrated circuit (IC) regulators, potentiometer bases for dimmers, relay blocks, cut-off switches, various valves such as exhaust valves, various pipes for fuel-related / exhaust systems / intake systems, intake nozzle vent pipes, intake manifolds, engine coolant connectors, carburetor bodies, carburetor gaskets, exhaust 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 and warm air flow control valves, brush holders for radiator motors, water pump impellers, turbine blades, wiper motor-related parts, distributors, starter switches, ignition coils and their spools, motor insulators, motor rotors, motor cores, starter relays, wiring harnesses for transmissions, window washer nozzles, air conditioner panel switch substrates, coils for fuel-related solenoid valves, connectors for fuses, horn terminals, insulating boards for electrical components, stepping motor rotors, lamp sockets, lamp reflectors, lamp housings, brake pistons, solenoid spools, oil filters, ignition device housings, etc., and can also be applied to other various uses.

[0099] Examples

[0100] Hereinafter, examples and comparative examples will be used for illustration, but the present invention is not limited to these examples. It should be noted that hereinafter, unless otherwise specified, "%" or "parts" is based on mass.

[0101] <Examples 1 to 12 and Comparative Examples 1 to 9>

[0102] According to the composition components and compounding amounts described in Table 1, each material was compounded. Thereafter, these compounded materials were put into a twin-screw extruder with exhaust holes "TEX-30α (product name)" manufactured by Japan Steel Works, Ltd., and melt-kneaded at a resin component ejection 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 the side feeder (S / T ratio 0.5), and the other materials were uniformly mixed in advance by a drum mixer and fed from the top feeder. After drying the obtained pellets of the resin composition in a Geer oven at 140°C for 2 hours, injection molding was performed to fabricate various test pieces, and the following tests were carried out.

[0103] <Evaluation>

[0104] (1) Measurement of dispersion diameter

[0105] The pellets obtained in each example and comparative example were supplied to an injection molding machine (SE-75D-HP) manufactured by Sumitomo Heavy Industries, Ltd. with the barrel temperature set at 310°C, and injection molding was performed using a mold for ISO D2 sheet forming with a mold temperature adjusted to 140°C to obtain ISO D2 sheets. For the cross-section of the sheet test piece, measurement was carried out by an SEM device ("JSM-6360A" manufactured by JEOL Ltd.). In the obtained image, about 100 phases (dispersion phases) containing solid lubricant were randomly selected, and the number average particle diameter of the particles was calculated. Among them, the particle diameter was calculated as the equivalent circle diameter. The results are shown in Tables 1 to 4.

[0106] (2) Measurement of tensile properties of welds

[0107] The pellets obtained in each example and comparative example were supplied to an injection molding machine (SE-75D-HP) manufactured by Sumitomo Heavy Industries, Ltd. with the barrel temperature set at 310°C, and injection molding was performed using a mold for ISO type 1A dumbbell sheet forming with a mold temperature adjusted to 140°C to obtain ISO type-A dumbbell sheets. It should be noted that the resin was injected from two-point gates to fabricate test pieces containing welds. For the obtained dumbbell sheets, the tensile strength was measured using the measurement methods based on ISO 527-1 and 2. The results are shown in Tables 1 to 4.

[0108] (3) Determination of Charpy impact strength

[0109] Under the same conditions as in (2), inject the resin from a single-point gate in such a way that the test piece does not contain a welded part. Cut the central part of the produced dumbbell-shaped test piece into a rod shape with a length of 80 mm, a width of 10 mm, and a thickness of 4 mm, perform notch machining, and use the one obtained by notch machining as an impact resistance test piece. According to ISO179-1 / 1eA, conduct a Charpy impact test and measure the impact strength (kJ / mm 2 ). The results are shown in Tables 1 to 4.

[0110] (4) Abrasion test

[0111] Supply the pellets obtained in each example and comparative example to an injection molding machine (SE-75D-HP) manufactured by Sumitomo Heavy Industries with the barrel temperature set at 310 °C, and use a mold with a temperature adjustment of 140 °C to obtain cylindrical test pieces with an inner diameter of 20 mm, an outer diameter of 25 mm, and a height of 15.0 mm. For the cylindrical test pieces, use a Suzuki type abrasion testing machine to measure the coefficient of friction and specific wear rate [10 -3 [mm 3 / (N×km)]]. The results are shown in Tables 1 to 4.

[0112] Measurement conditions:

[0113] Use two of the above test pieces formed by the injection molding machine under the conditions of pressure: 150 KPa, rotational speed: 0.5 m / s, measurement time: 60 minutes, and temperature environment: 23 °C, and conduct the Suzuki type abrasion test under the above measurement conditions.

[0114] (5) Evaluation of the durability of the molded product

[0115] Supply the pellets obtained in each example and comparative example to an injection molding machine (SE-75D-HP) manufactured by Sumitomo Heavy Industries with the barrel temperature set at 310 °C, and use a mold with a temperature adjustment of 140 °C to obtain a gear with a module of 1 mm, 30 teeth, and a tooth thickness of 5 mm as Gear A. Similarly, obtain a gear with a module of 1 mm, 31 teeth, and a tooth thickness of 5 mm as Gear B. Mesh the obtained Gear A and Gear B, and conduct a sliding test of rotating spur gears under the conditions of 25 °C, a torque of 1 Nm, and a rotational speed of 1000 rpm, and evaluate the time until the gear breaks as the durability time. The results are shown in Tables 1 to 4.

[0116] (6) Evaluation of formability

[0117] By visually observing the appearance of gear A in each of the examples and comparative examples obtained in (5), those with a shiny surface and resin filled up to the tooth tips were regarded as good, and those with a dull surface and resin not filled up to the tooth tips were regarded as having poor molding. In addition, the tooth tip portions of gear A were observed with 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.

[0118] (7) Measurement of the dimensional change rate of the gear due to water absorption

[0119] After drying the gear A in each of the examples and comparative examples obtained in (5) at 50 °C for 24 hours, it was cooled to room temperature (23 °C) in a desiccator. The tip circle diameter of gear A after cooling was measured at 10 arbitrary tooth portions, and the arithmetic mean value thereof was taken as the tip circle diameter (h0) of gear A after drying. Thereafter, it was immersed in distilled water at room temperature (23 °C) for 30 days. The tip circle diameter of gear A after immersion was measured at 10 arbitrary tooth portions, and the arithmetic mean value thereof was taken as the tip circle diameter (h1) of gear A after immersion. Using the obtained values, the change rate (%) of the tip circle diameter before and after immersion was calculated as the dimensional change rate (%) according to the formula of {(h1 - h0) / h0} × 100. The results are shown in Tables 1 to 4.

[0120] (8) Quantification of the carboxyl group content of the PAS resin

[0121] After pressing each of the PPS resins used in the examples and comparative examples at 350 °C, a load of 10 MPa, and for 60 seconds, it was quenched to 25 °C in 60 seconds, thereby forming a film showing amorphous properties. The obtained film showing amorphous properties was measured by a Fourier transform infrared spectroscopy apparatus (hereinafter, briefly referred to as "FT-IR apparatus"). The relative intensity of the absorbance at 1705 cm -1 in the infrared absorption spectrum with respect to the absorbance at 630.6 cm -1 was determined, and the content of carboxyl groups (hereinafter, briefly referred to as "total carboxyl group content") in the measurement sample was determined using a calibration curve prepared by the method described below. It should be noted that the carboxyl group content is expressed as the number of moles in 1 g of the resin mixture, and its unit is [μmol / g]. The calibration curve was prepared according to the following method. First, in a PAS resin prepared without acid treatment and having a carboxylate at the molecular end, a specified amount of 4-chlorophenylacetic acid was added and well mixed, and then a film was prepared in the same manner as above and measured by an FT-IR apparatus. A calibration curve was prepared by plotting the relative intensity ratio of the absorbances at the above two wavelengths with respect to the carboxyl group content calculated based on the added amount of 4-chlorophenylacetic acid.

[0122] [Table 1]

[0123]

[0124] [Table 2]

[0125]

[0126] [Table 3]

[0127]

[0128] [Table 4]

[0129]

[0130] It should be noted that the compounding ratios of the compounding components in Tables 1 to 4 use the following substances.

[0131] · PPS resin

[0132] A-1: PPS resin (melt viscosity (V6) 20 Pa·s, carboxyl group content 30 μmol / g)

[0133] A-2: PPS resin (melt viscosity (V6) 50 Pa·s, carboxyl group content 30 μmol / g)

[0134] A-3: PPS resin (melt viscosity (V6) 120 Pa·s, carboxyl group content 30 μmol / g)

[0135] A-4: PPS resin (melt viscosity (V6) 2000 Pa·s, carboxyl group content 20 μmol / g)

[0136] A-5: PPS resin (melt viscosity (V6) 4000 Pa·s, carboxyl group content 20 μmol / g)

[0137] · Fiber filler

[0138] B-1: Polyamide fiber (para-aramid fiber, average fiber length 3 mm)

[0139] B-2: Glass fiber "T-717H" manufactured by Nippon Electric Glass Co., Ltd., average fiber length 3.5 mm

[0140] · Solid lubricant

[0141] C-1: PTFE, "KT-600M" manufactured by Kitamura Co., Ltd. (dynamic friction coefficient 0.04)

[0142] C-2: Polyethylene, "LUBMER LY1040" manufactured by Mitsui Chemicals, Inc. (dynamic friction coefficient 0.15)

[0143] · Liquid silicone resin

[0144] D-1: "KF-96-1000CS" manufactured by Shin-Etsu Chemical Co., Ltd. (kinematic viscosity 1000 mm 2 / s)

[0145] D-2: "KF-10,000CS" manufactured by Shin-Etsu Chemical Co., Ltd. (kinematic viscosity 10,000 mm 2 / s)

[0146] · Silane coupling agent material

[0147] E-1: "XIAMETER (registered trademark) OFS-6040" manufactured by Dow Chemical Company

[0148] According to Tables 1 to 4, when comparing the examples with Comparative Example 1 and Comparative Example 2, it is shown that when the melt viscosity of the resin is outside a specific range, the formability or the durability of the gear is insufficient. When comparing the examples with Comparative Example 3 and Comparative Example 4, it is shown that when the compounding amount of PA fiber is outside a specific range, the mechanical properties, sliding properties, and dimensional change rate deteriorate. When comparing the examples with Comparative Examples 5 to 8, it is shown that when the compounding amount of the solid lubricant is outside a specific range, the mechanical properties or sliding properties are insufficient. When comparing the examples with Comparative Example 9, it is shown that when using a fiber filler other than PA resin, the specific wear rate becomes larger.

Claims

1. A polyarylene sulfide resin composition, characterized in that, It is a polyarylene sulfide resin composition compounded with a polyarylene sulfide resin (A), a polyamide fiber (B), and a solid lubricant (C). The polyarylene sulfide resin (A) has a melt viscosity (V6) measured after being held at 300 °C, load: 1.96×10 6 Pa, L / D = 10 (mm) / 1 (mm) for 6 minutes of 50 to 2000 Pa·s, and With respect to 100 parts by mass of the polyarylene sulfide resin (A), 5 to 35 parts by mass of the polyamide fiber (B) and 5 to 30 parts by mass of the solid lubricant (C) are compounded. The tensile strength of the weld part in ISO527-1, 2 of the molded product filled with the molten resin symmetrically from both ends of the dumbbell shape of the type A test piece specified in ISO20753 is 40 MPa or more.

2. The polyarylene sulfide resin composition according to claim 1, wherein, The polyarylene sulfide resin (A) has a carboxyl group in its molecular structure, and the content of the functional group is 10 to 200 μmol / g.

3. The polyarylene sulfide resin composition according to claim 1 or 2, wherein The dispersion diameter of the solid lubricant (C) is 50 μm or less.

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

5. The polyarylene sulfide resin composition according to claim 1 or 2, wherein With respect to 100 parts by mass of the polyarylene sulfide resin (A), 1 to 5 parts by mass of a liquid silicone resin (D) is further compounded.

6. The polyarylene sulfide resin composition according to claim 5, wherein, The kinematic viscosity of the liquid silicone resin (D) is 100 to 30,000 mm 2 / s.

7. A molded product obtained by melt-molding the polyarylene sulfide resin composition according to claim 1 or 2.

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

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

10. A method for manufacturing a polyarylene sulfide resin composition, characterized in that, It has the following steps: a step of compounding a polyarylene sulfide resin (A), a polyamide fiber (B), and a solid lubricant (C), and performing melt-kneading at a temperature above the melting point of the polyarylene sulfide resin (A). The polyarylene sulfide resin (A) has a melt viscosity (V6) measured after holding at 300 °C, load: 1.96×10 6 Pa, L / D = 10 (mm) / 1 (mm) for 6 minutes of 50 to 2000 Pa·s, and With respect to 100 parts by mass of the polyarylene sulfide resin (A), 5 to 35 parts by mass of the polyamide fiber (B) and 5 to 30 parts by mass of the solid lubricant (C) are compounded. The tensile strength of the weld part in ISO527-1, 2 of the molded product filled with the molten resin symmetrically from both ends of the dumbbell shape of the type A test piece specified in ISO20753 is 40 MPa or more.

11. The method for producing a polyarylene sulfide resin composition according to claim 10, wherein, The polyarylene sulfide resin (A) has a carboxyl group in its molecular structure, and the content of the functional group is 10 to 200 μmol / g.

12. The method for producing a polyarylene sulfide resin composition according to claim 10 or 11, wherein, The dispersion diameter of the solid lubricant (C) is 50 μm or less.

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

14. The method for producing a polyarylene sulfide resin composition according to claim 10 or 11, wherein, With respect to 100 parts by mass of the polyarylene sulfide resin (A), 1 to 10 parts by mass of a liquid silicone resin (D) is further compounded.

15. The method for producing a polyarylene sulfide resin composition according to claim 14, wherein, The kinematic viscosity of the liquid silicone resin (B) is 100 to 30,000 mm 2 / s.

16. A method for manufacturing a molded product, which has a step of melt-molding the polyarylene sulfide resin composition obtained by the method for manufacturing a polyarylene sulfide resin composition according to claim 10 or 11.

Images