WO2022059344A1 - 摺動部材用樹脂組成物及び摺動部材 - Google Patents
摺動部材用樹脂組成物及び摺動部材 Download PDFInfo
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- WO2022059344A1 WO2022059344A1 PCT/JP2021/027325 JP2021027325W WO2022059344A1 WO 2022059344 A1 WO2022059344 A1 WO 2022059344A1 JP 2021027325 W JP2021027325 W JP 2021027325W WO 2022059344 A1 WO2022059344 A1 WO 2022059344A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L81/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing sulfur with or without nitrogen, oxygen or carbon only; Compositions of polysulfones; Compositions of derivatives of such polymers
- C08L81/02—Polythioethers; Polythioether-ethers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L81/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing sulfur with or without nitrogen, oxygen or carbon only; Compositions of polysulfones; Compositions of derivatives of such polymers
- C08L81/04—Polysulfides
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/20—Sliding surface consisting mainly of plastics
- F16C33/201—Composition of the plastic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/324—Alkali metal phosphate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/325—Calcium, strontium or barium phosphate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/068—Ultra high molecular weight polyethylene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethylene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L79/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen or carbon only, not provided for in groups C08L61/00 - C08L77/00
- C08L79/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C08L79/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
- F16C2208/20—Thermoplastic resins
- F16C2208/30—Fluoropolymers
- F16C2208/32—Polytetrafluorethylene [PTFE]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
- F16C2208/20—Thermoplastic resins
- F16C2208/52—Polyphenylene sulphide [PPS]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
- F16C2208/20—Thermoplastic resins
- F16C2208/76—Polyolefins, e.g. polyproylene [PP]
- F16C2208/78—Polyethylene [PE], e.g. ultra-high molecular weight polyethylene [UHMWPE]
Definitions
- the present invention relates to a resin composition for a sliding member and a sliding member.
- Polyphenylene sulfide resin has excellent heat resistance, chemical resistance, moldability, etc., and is therefore used as a sliding member for office automation equipment, household electrical equipment, and the like. Further, it is expected to be used as a sliding member for food machines subjected to heat sterilization treatment and hypochlorous acid sterilization treatment.
- polyphenylene sulfide resin itself has low elongation and inferior toughness, and has insufficient self-lubricating property. Therefore, when used as a sliding member, it is usually reinforced with inorganic fibers such as glass fiber and solid-lubricated. It is used with the addition of an agent.
- Patent Document 1 proposes a bearing body formed of a composition containing a polyphenylene sulfide resin, glass fibers or carbon fibers, and a tetrafluoroethylene resin.
- a sliding member to which a reinforcing filler such as glass fiber or carbon fiber is added is used as a mating material of a soft metal such as stainless steel or an aluminum alloy, the mating material is damaged by sliding with the mating material. There was a problem that it developed into abstract wear.
- Patent Document 2 describes polyphenylene sulfide resin with a reinforcing filler such as glass fiber and carbon fiber, and phosphate in addition to tetrafluoroethylene resin.
- a sliding member made of a blended resin composition has been proposed. This sliding member utilizes the film-forming property of the lubricating film to the mating material by phosphate to prevent damage to the mating material due to the reinforcing filler and to improve the lubricity. Under the harsh conditions of use, there is a problem that both wear resistance and lubricity are insufficient.
- Patent Document 3 contains an unfired high molecular weight tetrafluoroethylene resin without using a reinforcing filler such as glass fiber or carbon fiber as described above, and the high molecular weight tetrafluoroethylene resin thereof is blended.
- a sliding member has been proposed in which the mechanical strength of the molded product is improved and wear resistance and lubricity are imparted by kneading the mixture into fibers and orienting the mixture.
- it is necessary to add a large amount of high molecular weight ethylene tetrafluoride resin and in this case, the fibrous high molecular weight ethylene tetrafluoride resin is used.
- the agglomerates tend to agglomerate, and these agglomerates cause poor appearance of the molded product and surface roughness during machining.
- the polyphenylene sulfide resin is fragile because it is inferior in toughness as described above, and there is a problem that abnormal wear occurs when the surface roughness of the sliding mating material is rough.
- the present invention has been made in view of the above points, and is a sliding member which is excellent in formability and machinability, and can improve sliding properties including lubricity and wear resistance and mechanical properties. It is an object of the present invention to provide a resin composition for use and a sliding member.
- the resin composition for a sliding member of the present invention contains 15 to 40% by mass of a tetrafluoroethylene resin as an additive, 2 to 20% by mass of an ultrahigh molecular weight polyethylene resin, and a modification with respect to 40 to 80% by mass of the polyphenylene sulfide resin.
- a polyolefin resin of 0.1 to 5% by mass and an amorphous polymer of 0.5 to 5% by mass are blended.
- the resin composition for a sliding member of the present invention may contain at least one selected from phosphates, carbonates and sulfates as an additional component in an amount of 0.1 to 10% by mass.
- the resin composition for a sliding member of the present invention contains 15 to 40% by mass of a tetrafluoroethylene resin as an additive, 2 to 20% by mass of an ultrahigh molecular weight polyethylene resin, and a modification with respect to 40 to 80% by mass of the polyphenylene sulfide resin.
- a polyolefin resin of 0.1 to 5% by mass and an amorphous polymer of 0.5 to 5% by mass are blended.
- the polyphenylene sulfide resin constitutes the base material of the resin composition for sliding members of the present invention, and there are crosslinked type, linear type, and semi-linear type having different molecular structures.
- the semi-linear mold is preferable in terms of suppressing molding defects such as insufficient filling inside the mold due to outgas and carbonization / discoloration.
- the cross-linked type is "T4 (trade name)” manufactured by DIC
- the linear type is "W-214 (trade name)” manufactured by Polyplastics
- the semi-linear type is "Ecotran N-200 (trade name)” manufactured by Teijin. Can be mentioned.
- the content of the polyphenylene sulfide resin needs to be 40 to 80% by mass, preferably 49 to 69% by mass. As a result, the original excellent heat resistance, chemical resistance, moldability, etc. of the polyphenylene sulfide resin can be maintained.
- the ethylene tetrafluoride resin blended in the resin composition for sliding members of the present invention imparts lubricity to the sliding members obtained by molding the resin composition for sliding members and contributes to low friction.
- the compounding amount thereof is 15 to 40% by mass, preferably 20 to 35% by mass. If the blending amount is less than 15% by mass, sufficient low friction cannot be obtained, and if the blending amount exceeds 40% by mass, the appearance may be poor due to the aggregation of the tetrafluoroethylene resin.
- Ethylene tetrafluoride resins include high molecular weight ethylene tetrafluoride resins mainly used for molding and low molecular weight ethylene tetrafluoride resins mainly used for imparting lubricity.
- either the high molecular weight ethylene tetrafluoride resin or the low molecular weight ethylene tetrafluoride resin can be used alone, but the high molecular weight ethylene tetrafluoride resin and the low molecular weight ethylene resin are used. It is preferable to add ethylene resin in an appropriate ratio.
- the high molecular weight ethylene tetrafluoride resin usually has a molecular weight of several million to 10 million and is mainly used for molding as a molding powder or a fine powder.
- a molding powder or a fine powder For example, "Polyflon” manufactured by Daikin Industries, Ltd. Examples include “M-12 (trade name)” and “Polyfylene M-112 (trade name)".
- M-12 trade name
- Polyfylene M-112 trade name
- a high molecular weight ethylene tetrafluoride resin that has been molded and fired and then crushed can also be used.
- K300M (trade name) manufactured by Kitamura Co., Ltd. can be mentioned.
- the high molecular weight ethylene tetrafluoride resin also contributes to imparting lubricity, but mainly contributes to the toughness of the sliding member obtained by forming the resin composition for the sliding member into fibrous form in melt kneading.
- the blending amount is 1 to 10% by mass, preferably 1 to 5% by mass. If the blending amount is less than 1% by mass, the effect of improving the mechanical strength is poor, and if it exceeds 10% by mass, the formability of the resin composition for a sliding member or the molded product (sliding member) due to aggregation or excessive thickening occurs. There is a risk of spoiling the appearance of.
- the low molecular weight ethylene tetrafluoride resin mainly plays a role of imparting lubricity.
- the blending amount is 10 to 35% by mass, preferably 15 to 30% by mass. If the blending amount is less than 10% by mass, the lubricity is not sufficiently imparted to the sliding member, and if it exceeds 35% by mass, the moldability of the resin composition for the sliding member deteriorates or the molded product (sliding member). It causes a decrease in the mechanical strength of the.
- the ultra-high molecular weight polyethylene resin blended in the resin composition for a sliding member of the present invention has an ultimate viscosity [ ⁇ ] of 10 dl / g or more measured in a decanoic acid solvent at 135 ° C., and its viscosity average molecular weight is 500,000. Up to 6 million can be used, and examples thereof include "Miperon (trade name)" manufactured by Mitsui Kagaku Co., Ltd.
- the ultra-high molecular weight polyethylene resin is composed of an ultra-high molecular weight polyethylene resin having an ultimate viscosity of 10 to 40 dl / g at 135 ° C.
- a low molecular weight or high molecular weight polyethylene resin having the same ultimate viscosity of 0.1 to 5 dl / g examples thereof include “Lubmer (trade name)” manufactured by Mitsui Kagaku Co., Ltd.
- an acid-modified ultra-high molecular weight polyethylene resin can also be used, and examples thereof include “modified lubemer (trade name)” manufactured by Mitsui Chemicals, Inc., which is modified with maleic anhydride.
- the ultra-high molecular weight polyethylene resin has the effect of improving the sliding characteristics in the light load, medium to high speed range by being blended in the resin composition for sliding members. In general, it is difficult to improve the sliding characteristics under the above conditions with the tetrafluoroethylene resin alone.
- the blending amount of the ultra-high molecular weight polyethylene resin is 2 to 20% by mass, preferably 2 to 10% by mass. If the blending amount of the ultra-high molecular weight polyethylene resin is less than 2% by mass, the effect of improving the sliding characteristics described above is poor, and if it exceeds 20% by mass, the dispersion ratio in the polyphenylene sulfide resin increases and the wear resistance And there is a risk of deteriorating moldability.
- the modified polyolefin resin to be blended in the resin composition for sliding members of the present invention is graft-modified with an ethylene ionomer, a polyolefin resin having an epoxy group in the molecule, an unsaturated carboxylic acid, an anhydride thereof, or a derivative thereof.
- Polyolefin resin can be used.
- Ethylene-based ionomer is an ionic copolymer obtained by adding metal ions having a valence of 1 to 3 to a copolymer of ⁇ -olefin containing ethylene and ⁇ , ⁇ -unsaturated carboxylic acid, and is a metal. It has an intermolecular cross-linking structure by ions.
- examples of the ⁇ , ⁇ -unsaturated carboxylic acid include acrylic acid, methacrylic acid, and itaconic acid.
- typical examples of metal ions having a valence of 1 to 3 include Na + , K + , Ca 2+ , Zn 2+ , Al 3+ and the like.
- "Himilan (trade name)" manufactured by Mitsui-Dau Polychemical Co., Ltd. in which the molecules of the ethylene-methacrylic acid copolymer are crosslinked with Na + and Zn 2+ can be mentioned.
- the polyolefin resin having an epoxy group in the molecule is specifically manufactured by Sumitomo Chemical Co., Ltd., in which a copolymer of ethylene and glycidyl methacrylate and vinyl acetate or methyl acrylate as a third component are copolymerized with the copolymer.
- "Bond First (trade name)” "Modiper A 40.0 0 series (trade name)” manufactured by Nichiyu Co., Ltd., in which a copolymer of ethylene and glycidyl methacrylate is grafted with polystyrene, polymethylmethacrylate or acrylonitrile-styrene copolymer. ) ”And so on.
- the polyolefin resin forming the main chain of the polyolefin resin graft-modified with unsaturated carboxylic acid, its anhydride or a derivative thereof is a homopolymer of ⁇ -olefin, a copolymer of two or more kinds of ⁇ -olefin, or ⁇ . Examples thereof include a copolymer of an olefin and another compound copolymerizable with the ⁇ -olefin.
- Examples of the ⁇ -olefin include ethylene, propylene, 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, Examples thereof include ⁇ -olefins having 2 to 20 carbon atoms such as 1-eikosen. Examples of other compounds include compounds having a polyunsaturated bond such as conjugated diene and non-conjugated diene, vinyl acetate, acrylic acid ester and the like.
- suitable polyolefin resins include low-density, medium-density or high-density polyethylene, linear low-density polyethylene, polypropylene, and ⁇ -olefin copolymers (ethylene-propylene copolymer, ethylene-vinyl acetate copolymer). , Polyethylene-butene copolymer, ethylene-hexene copolymer, etc.) and the like.
- the unsaturated carboxylic acid, its anhydride or a derivative thereof is a compound having an ethylenically unsaturated bond and a carboxyl group, an acid anhydride or a derivative group in one molecule.
- unsaturated carboxylic acids include acrylic acid, methacrylic acid, ⁇ -ethylacrylic acid, maleic acid, fumaric acid, tetrahydrophthalic acid, methyltetrahydrophthalic acid, itaconic acid, citraconic acid, crotonic acid, isocrotonic acid, and endosis.
- maleyl chloride, maleimide, N-phenylmaleimide, maleic anhydride, itaconic anhydride, citraconic anhydride, monomethyl maleate, dimethyl maleate, glycidyl maleate and the like can be mentioned.
- acrylic acid, methacrylic acid, maleic acid, maleic anhydride, and itaconic anhydride are preferable, and maleic anhydride is particularly preferable.
- maleic anhydride-modified polyolefin resin examples include maleic anhydride-modified polyethylene resin, maleic anhydride-modified polypropylene resin, maleic anhydride-modified ⁇ -olefin copolymer, and maleic anhydride-modified styrene-ethylene / butylene-styrene copolymer (SEBS).
- SEBS butylene-styrene copolymer
- Etc. can be mentioned.
- Specific examples include, for example, maleic anhydride-modified polyethylene resin, maleic anhydride-modified polypropylene resin, "Admer (trade name)” manufactured by Mitsui Chemicals, Inc., "Modic (trade name)” manufactured by Mitsubishi Chemicals, etc.
- Examples of the maleic anhydride-modified ⁇ -olefin copolymer include “Toughmer (trade name)” manufactured by Mitsui Chemicals, Inc., and examples of the maleic anhydride-modified styrene-ethylene / butylene-styrene copolymer include maleic anhydride-modified styrene-ethylene / butylene-styrene copolymer. , “Tough Tech (trade name)” manufactured by Asahi Kasei Co., Ltd. can be mentioned.
- the obtained molded product plays a role of improving mechanical properties such as impact resistance and elongation.
- the blending amount of the modified polyolefin resin is 0.1 to 5% by mass, preferably 0.5 to 3% by mass. If the blending amount of the modified polyolefin resin is less than 0.1% by mass, the improvement of the above mechanical properties cannot be sufficiently exhibited, and if it exceeds 5% by mass, the heat resistance and chemical resistance peculiar to the polyphenylene sulfide resin are not exhibited. There is a risk that the sex will be impaired.
- a polysulfone resin As the amorphous polymer, a polysulfone resin, a polyetherimide resin, or a polyphenylene ether resin is used.
- the polysulfone-based resin is a polymer containing a sulfonyl group ( -SO2- ) in its constituent molecules, and is a polyethersulfone resin represented by the following formula (1), a polysulfone resin represented by the following formula (2), and the like. Examples thereof include a polyphenylsulfone resin represented by the following formula (3).
- polyethersulfone resin As the polyethersulfone resin, "Sumika Excel (trade name)” manufactured by Sumitomo Chemical Co., Ltd., “Mitsui PES (trade name)” manufactured by Mitsui Kagaku Co., Ltd., and “Veradel (trade name)” manufactured by Solvay Co., Ltd.
- polyetherimide resin for example, "Ultem (trade name)” manufactured by SABIC
- polyphenylene ether resin for example, "Zylon (trade name)” manufactured by Asahi Kasei Co., Ltd. and “Yupiece” manufactured by Mitsubishi Engineering Plastics Co., Ltd. (Product name) ”,“ Noril (trade name) ”manufactured by SABIC, etc.
- the moldability of the resin composition for sliding members is improved, and the toughness and wear resistance of the obtained molded product (sliding member) are improved. Also plays a role in improving.
- the blending amount is 0.5 to 5% by mass, preferably 1 to 3% by mass. If the blending amount is less than 0.5% by mass, the above effect cannot be sufficiently exerted, and if it exceeds 5% by mass, the moldability may be deteriorated.
- At least one selected from phosphates, carbonates and sulfates may be blended as an additional component.
- Phosphates, carbonates, and sulfates are not substances that exhibit lubricity like solid lubricants such as graphite and molybdenum disulfide, but by being blended in a resin composition for sliding members, they can be added. In sliding with the mating material, it promotes the film-forming property of the lubricating film such as tetrafluoroethylene resin on the mating material surface (sliding surface), and exerts the effect of improving the sliding characteristics of the sliding member.
- phosphate carbonate and sulfate, salts of alkali metal and alkaline earth metal are preferable, and as the phosphate, for example, lithium tertiary phosphate, calcium tertiary phosphate, calcium secondary phosphate and secondary phosphoric acid are used.
- the phosphate for example, lithium tertiary phosphate, calcium tertiary phosphate, calcium secondary phosphate and secondary phosphoric acid are used.
- Magnesium, lithium pyrophosphate, calcium pyrophosphate, magnesium pyrophosphate, lithium metaphosphate, calcium metaphosphate, magnesium metaphosphate, etc. as carbonates, calcium carbonate, magnesium carbonate, barium carbonate, strontium carbonate, etc., as sulfates, Examples thereof include calcium sulfate and barium sulfate.
- the blending amount of phosphate, carbonate and sulfate is 0.1 to 10% by mass, preferably 1 to 5% by mass. If the compounding amount of the phosphate is less than 0.1% by mass, the above-mentioned effect of promoting the film-forming property of the lubricating film cannot be sufficiently exerted, and if the compounding amount exceeds 10% by mass, the mating material is used. The amount of the lubricating film formed on the surface becomes too large, which in turn lowers the wear resistance. It was
- the resin composition for a sliding member of the present invention is essentially composed of the above-mentioned composition, but in the present invention, additional components are added in addition to these components as long as the effects of the present invention are not significantly impaired.
- a non-fibrous inorganic filler a lubricating oil such as mineral oil, an ester oil, and a silicone oil, and a pigment such as wax and carbon black can be blended.
- non-fibrous inorganic fillers include silicates such as talc, clay, mica, kaolin, sericite, bentonite, and alumina silicate, and metal oxides such as silicon oxide (silica), magnesium oxide, titanium oxide, and iron oxide.
- These non-fibrous inorganic fillers may be pretreated with a silane-based or titanate-based coupling agent to improve the adhesion to the base resin. It was
- each component is measured so that the blending amount in the composition is within the above range, and a single-screw extruder, a twin-screw extruder, a Banbury mixer, a roll, and a lavender , Can be manufactured by putting it in a normal kneader such as a kneader and melt-kneading it.
- the above essential components, and if desired, additional components, a cross-linking catalyst, etc. are kneaded into pellets using an extruder or the like, and then subjected to processing.
- each component is directly supplied to the molding machine and used as a composition in the molding machine. It can also be molded while kneading.
- the B component or the C component can be kneaded to a high concentration in advance to form a masterbatch, which can be blended or directly molded while being diluted with another component such as the A component.
- polyphenylene sulfide resin high molecular weight ethylene tetrafluoride resin, low molecular weight ethylene tetrafluoride resin, ultra high molecular weight polyethylene resin, modified polyolefin resin, amorphous polymer, phosphate, sulfate, lubricant and As the pigment, the materials shown below were used. The following materials all indicate product names.
- B High molecular weight ethylene tetrafluoride resin (B-1) "Polyflon M-12” manufactured by Daikin Industries, Ltd.
- Examples 1 to 15 and Comparative Examples 1 to 12 The above materials were used as each component, each was blended in the component compositions shown in Tables 1 and 2, and melt-kneaded at 290 ° C. using a twin-screw extruder to obtain a pellet-shaped composition. Next, a test piece (a square plate having a length of 30 mm, a width of 30 mm, and a thickness of 3 mm) was prepared from the pellets using an injection molding machine at a molding temperature of 300 ° C. and a mold temperature of 140 ° C.
- Tables 1 and 2 show the results of performing the following sliding tests on the test pieces obtained as described above, measuring the friction coefficient and the amount of wear, and evaluating the bending strength and formability. ..
- Evaluation criteria ⁇ : Good, ⁇ : Impossible ⁇ Moldability 2> A molded product (sliding member) was molded from pellets using an injection molding machine, and the appearance state (burning and foaming due to gas, aggregation of additives) of the molded product was visually evaluated and evaluated. Evaluation criteria ⁇ : Good, ⁇ : Impossible
- Comparative Example 1 in which the blending amount of the tetrafluoroethylene resin is smaller than the range of the present invention and the blending amount of the high molecular weight ethylene tetrafluoride resin is smaller than the preferable range of the present invention, the high molecular weight ethylene tetrafluoride is blended. Since the reinforcement and thickening due to the fibrosis of the resin are insufficient, the bending strength is low, and molding defects such as burrs are generated in the molded product. When the blending amount of the high molecular weight ethylene tetrafluoride resin is increased, the bending strength is improved due to the fibrosis of the high molecular weight ethylene tetrafluoride. However, in Comparative Example 2, the blending amount of the entire tetrafluoroethylene resin is the present invention. Since the amount is larger than the above range, the extrudability is deteriorated and there is a problem that the product cannot be manufactured.
- Comparative Example 3 in which the blending amount of the ethylene tetrafluoride resin is smaller than the range of the present invention and the blending amount of the low molecular weight ethylene tetrafluoride resin is smaller than the preferable range of the present invention, sufficient lubricity is obtained. However, the coefficient of friction is higher and the amount of wear is larger than in the examples.
- Comparative Examples 2 and 4 in which the blending amount of the ethylene tetrafluoride resin is larger than the range of the present invention and the blending amount of the low molecular weight ethylene tetrafluoride resin is larger than the preferable range of the present invention, polyphenylene as a matrix is used. There is a problem that the amount of sulfide resin is insufficient and extrusion molding is not possible.
- Comparative Example 5 in which the blending amount of the ultra-high molecular weight polyethylene resin is smaller than the range of the present invention, has a higher coefficient of friction and a larger amount of wear as compared with Examples, and is particularly slid with a mating material having a rough surface. Under the test condition 3, the wear resistance is significantly reduced. This is because the ultra-high molecular weight polyethylene resin can quickly form a soft resin transfer film on the mating material and smooth the surface of the mating material at the time of initial familiarization with sliding.
- Comparative Example 7 in which the modified polyolefin resin was not blended, the sliding performance and the bending strength were lowered, and a molding defect in which burrs were generated in the molded product occurred. Since the modified polyolefin resin undergoes thermal deterioration at the molding temperature of the polyphenylene sulfide resin, if it is excessively blended, the molded product will be burnt and the appearance will be deteriorated. Therefore, in Comparative Example 8 in which the blending amount of the modified polyolefin resin is larger than the range of the present invention, the sliding performance is deteriorated and the appearance is deteriorated.
- Comparative Example 9 In Comparative Example 9 in which the amorphous polymer was not blended, the wear resistance was lowered and burrs were generated in the molded product. The addition of the amorphous polymer improves the wear resistance, but in Comparative Example 10 in which the amount of the amorphous polymer blended is larger than the range of the present invention, the surface roughness of the molded product becomes rough and the appearance is poor. It has occurred.
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Abstract
Description
本発明の摺動部材用樹脂組成物に配合される変性ポリオレフィン樹脂として、エチレン系アイオノマー、分子内にエポキシ基を有するポリオレフィン樹脂、および不飽和カルボン酸、その無水物またはそれらの誘導体でグラフト変性したポリオレフィン樹脂を使用することができる。
〔A〕ポリフェニレンサルファイド樹脂
(A-1)帝人社製の「エコトランN-200」
〔B〕高分子量四フッ化エチレン樹脂
(B-1)ダイキン工業社製の「ポリフロンM-12」
(B-2)喜多村社製の「KT300M」
〔C〕低分子量四フッ化エチレン樹脂
(C-1)スリーエム社製の「ダイオニンTF9207Z」
(C-2)AGC社製の「フルオンL169J」
〔D〕超高分子量ポリエチレン樹脂
(D-1)三井化学社製の「変性リュブマーLY1040」
(D-2)三井化学社製の「ミペロンXM-220」
〔E〕変性ポリオレフィン樹脂
(E-1)エチレン系アイオノマー 三井・ダウポリケミカル社製の「ハイミラン1855」
(E-2)エポキシ基含有ポリオレフィン樹脂 住友化学社製の「ボンドファーストE」
〔F〕非晶性ポリマー
(F-1)ポリエーテルスルホン樹脂 住友化学社製の「スミカエクセル4800G」
(F-2)ポリフェニルスルホン樹脂 CERAMER社製の「CERAMER60」
〔G〕リン酸塩
(G-1)ピロリン酸カルシウム(米山化学社製)
(G-2)第三リン酸リチウム(太平化学産業社製)
〔H〕硫酸塩
(H-1)硫酸バリウム 堺化学工業社製の「BMH-60」
〔I〕滑剤
(I-1)ワックス クラリアントケミカルズ社製の「LicowaxPED191」
〔J〕顔料
(J-1)カーボンブラック キャボット社製の「BP4350」
各成分として上記材料を使用し、それぞれを表1及び表2に示す成分組成で配合し、二軸押出機を用いて290℃で溶融混錬し、ペレット状の組成物を得た。次いで、このペレットを射出成形機を用いて成形温度300℃、金型温度140℃にてテストピース(縦30mm、横30mm、厚さ3mmの方形状のプレート)を作製した。
<摺動試験1>
運動形態:スラスト一方向回転
面圧:100kgf/cm2
速度:1m/min
時間:20時間
相手材:SUS304(Ra0.15(μm))
潤滑条件:無潤滑
<摺動試験2>
運動形態:スラスト一方向回転
面圧:10kgf/cm2
速度:30m/min
時間:20時間
相手材:SUS304(Ra0.15(μm))
潤滑条件:無潤滑
<摺動試験3>
運動形態:スラスト一方向回転
面圧:100kgf/cm2
速度:1m/min
時間:20時間
相手材:SUS304(Ra0.32(μm))
潤滑条件:無潤滑
<曲げ強度>
住友重機械工業製射出成形機SE-50DUZを用い、樹脂温度300℃、金型温度140℃にて、長さ80mm、幅10mm、厚み4mmの曲げ試験片を成形した。この試験片を用い、支点間距離100mm、クロスヘッド速度5mm/min、温度23℃、相対湿度50%条件下で、JIS-K7171に準拠し曲げ強度を測定した。
<成形性1>
射出成形機を使用してペレットから成形物(摺動部材)を成形し、当該成形物のバリの有無を目視し、評価した。
評価基準 ○:良、×:不可
<成形性2>
射出成形機を使用してペレットから成形物(摺動部材)を成形し、当該成形物の外観状態(ガスによる焼けや発泡、添加剤の凝集)を目視し、評価した。
評価基準 ○:良、×:不可
Claims (9)
- ポリフェニレンサルファイド樹脂40~80質量%に対して、添加剤として四フッ化エチレン樹脂15~40質量%、超高分子量ポリエチレン樹脂2~20質量%、変性ポリオレフィン樹脂0.1~5質量%および非晶質ポリマー0.5~5質量%が配合されている摺動部材用樹脂組成物。
- 四フッ化エチレン樹脂は、高分子量四フッ化エチレン樹脂1~10質量%、低分子量四フッ化エチレン樹脂10~35質量%からなる請求項1に記載の摺動部材用樹脂組成物。
- 変性ポリオレフィン樹脂は、エチレン系アイオノマー、分子内にエポキシ基を有するポリオレフィン樹脂、および不飽和カルボン酸、その無水物またはそれらの誘導体でグラフト変性したポリオレフィン樹脂から選択される請求項1又は2に記載の摺動部材用樹脂組成物。
- 不飽和カルボン酸、その無水物またはそれらの誘導体でグラフト変性したポリオレフィン樹脂は、無水マレイン酸変性ポリエチレン樹脂、無水マレイン酸変性ポリプロピレン樹脂、無水マレイン酸変性エチレン-α-オレフィン共重合体、無水マレイン酸変性スチレン-エチレン/ブチレン-スチレン共重合体から選択される請求項3に記載の摺動部材用樹脂組成物。
- 非晶質ポリマーは、ポリスルホン系樹脂、ポリエーテルイミド樹脂、ポリフェニレンエーテル樹脂から選択される請求項1から請求項4のいずれか一項に記載の摺動部材用樹脂組成物。
- ポリスルホン系樹脂は、ポリエーテルスルホン樹脂、ポリスルホン樹脂、ポリフェニルスルホン樹脂から選択される請求項5に記載の摺動部材用樹脂組成物。
- 追加成分として、リン酸塩、炭酸塩および硫酸塩から選択される少なくとも一種が0.1~10質量%配合される請求項1から請求項6のいずれか一項に記載の摺動部材用樹脂組成物。
- リン酸塩、炭酸塩、硫酸塩は、アルカリ金属またはアルカリ土類金属の塩である請求項7に記載の摺動部材用樹脂組成物。
- 請求項1から請求項8のいずれか一項に記載の摺動部材用樹脂組成物よりなる摺動部材。
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| CN202180047725.4A CN115768834B (zh) | 2020-09-16 | 2021-07-21 | 滑动部件用树脂组合物和滑动部件 |
| US18/015,307 US20230272217A1 (en) | 2020-09-16 | 2021-07-21 | Resin composition for sliding member, and sliding member |
| EP21869031.1A EP4166610B1 (en) | 2020-09-16 | 2021-07-21 | Resin composition for sliding member, and sliding member |
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| JP2020155728A JP7544545B2 (ja) | 2020-09-16 | 2020-09-16 | 摺動部材用樹脂組成物及び摺動部材 |
| JP2020-155728 | 2020-09-16 |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP4166610B1 (en) | 2025-04-30 |
| JP7544545B2 (ja) | 2024-09-03 |
| US20230272217A1 (en) | 2023-08-31 |
| JP2022049498A (ja) | 2022-03-29 |
| EP4166610A4 (en) | 2024-07-10 |
| CN115768834A (zh) | 2023-03-07 |
| EP4166610A1 (en) | 2023-04-19 |
| CN115768834B (zh) | 2025-05-16 |
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