Sliding material composition and sliding member

Abstract

It is an object of the invention to provide a sliding material composition and a sliding member capable of achieving low friction property at starting time and during sliding and also being excellent in abrasion resistance, especially when a counterpart sliding member is a rubber-based material. The invention relates to a sliding material composition for use in a sliding member whose counterpart sliding member is configured of rubber, the sliding material composition comprising a binder resin, 5 to 25 vol % of an Nω-monoacyl basic amino acid, 5 to 25 vol % of molybdenum disulfide, and 5 to 20 vol % of polytetrafluoroethylene.

1 . A sliding material composition for use in a sliding member whose counterpart sliding member is configured of rubber, the sliding material composition comprising:
 a binder resin;   5 to 25 vol % of an Nω-monoacyl basic amino acid;   5 to 25 vol % of molybdenum disulfide; and   5 to 20 vol % of polytetrafluoroethylene.   
     
     
         2 . The sliding material composition according to  claim 1 ,
 wherein a ratio of a content of the polytetrafluoroethylene to a content of the molybdenum disulfide on a volume basis is 0.5 to 2.0.   
     
     
         3 . The sliding material composition according to  claim 1 ,
 wherein, taking a total content of the molybdenum disulfide and polytetrafluoroethylene as X and a content of the Nω-monoacyl basic amino acid as Y, a ratio of X to Y satisfies a relationship of 2≦X/Y≦3 on a volume basis.   
     
     
         4 . The sliding material composition according to  claim 1 , further comprising: 10 vol % or less of at least one kind of solid lubricant selected from a group consisting of graphite, tungsten disulfide, mica, a fluorine resin other than polytetrafluoroethylene, boron nitride, graphite fluoride, and fullerene. 
     
     
         5 . The sliding material composition according to  claim 1 , further comprising: at least one kind of inorganic additive selected from a group consisting of SiC, alumina, Si 3 N 4 , TiO 2 , SiO 2 , calcium carbonate, barium sulfate, and calcium phosphate. 
     
     
         6 . The sliding material composition according to  claim 1 ,
 wherein the binder resin is at least one kind of resin selected from a group consisting of a polyamideimide resin, a polyimide resin, a phenol resin, a polyacetal resin, a polyether ether ketone resin, and a polyphenylene sulfide resin.   
     
     
         7 . A sliding member whose counterpart sliding member is configured of rubber, the sliding member comprising:
 a base material formed of a material selected from the group consisting of iron and steel, stainless steel, cast iron, copper, copper alloy, aluminum, aluminum alloy, rubber, plastics and ceramics; and   a coating layer provided on the surface of the base material and including:
 a binder resin, 
 5 to 25 vol % of an Nω-monoacyl basic amino acid, 
 5 to 25 vol % of molybdenum disulfide, and 
 5 to 20 vol % of polytetrafluoroethylene. 
   
     
     
         8 . The sliding member according to  claim 7 ,
 wherein a ratio of a content of the polytetrafluoroethylene to a content of the molybdenum disulfide in the coating layer on a volume basis is 0.5 to 2.0.   
     
     
         9 . The sliding member according to  claim 7 ,
 wherein, taking a total content of the molybdenum disulfide and polytetrafluoroethylene as X and a content of the Nω-monoacyl basic amino acid as Y in the coating layer, a ratio of X to Y satisfies a relationship of 2≦X/Y≦3 on a volume basis.   
     
     
         10 . The sliding member according to  claim 7 ,
 wherein the coating layer contains 10 vol % or less of at least one kind of solid lubricant selected from a group consisting of graphite, tungsten disulfide, mica, a fluorine resin other than polytetrafluoroethylene, boron nitride, graphite fluoride, and fullerene.   
     
     
         11 . The sliding member according to  claim 7 ,
 wherein the coating layer contains at least one kind of inorganic additive selected from a group consisting of SiC, alumina, Si 3 N 4 , TiO 2 , SiO 2 , calcium carbonate, barium sulfate, and calcium phosphate.   
     
     
         12 . The sliding member according to  claim 7 ,
 wherein the binder resin is at least one kind of resin selected from a group consisting of a polyamideimide resin, a polyimide resin, a phenol resin, a polyacetal resin, a polyether ether ketone resin, and a polyphenylene sulfide resin.   
     
     
         13 . The sliding member according to  claim 7 ,
 wherein the counterpart sliding member is a sealing component of a hub bearing part for a vehicle.