Lubricant composition and manufacturing method of lubricant composition

Abstract

Provided are a lubricant composition in which low friction and low abrasion are compatible in various temperatures and loads, and a manufacturing method of a lubricant composition. A lubricant composition of the present invention contains at least trivalent or more polyol a1; a mixture b1 of at least one of a polymerization reaction mixture of an unsaturated fatty acid having 18 to 22 carbon atoms which contains at least 75 mass % of a divalent carboxylic acid having 36 to 44 carbon atoms or a mixture obtained by performing hydrogenation with respect to the polymerization reaction mixture; and composite ester A containing polyester in which monool c1 represented by General Formula (1) described below is condensed, in which a feed ratio of the number of moles of a hydroxyl group of a1/the number of moles of a carboxylic acid of b1/the number of moles of a hydroxyl group of c1 is 1/1.5 to 2.0/0.7 to 1.5, and a content of the composite ester A is 0.1 to 5 mass % with respect to the total mass of the lubricant composition. R—OH  General Formula (1):

What is claimed is: 
     
         1 . A lubricant composition, containing at least:
 trivalent or more polyol a1;   a mixture b1 of at least one of a polymerization reaction mixture of an unsaturated fatty acid having 18 to 22 carbon atoms which contains at least 75 mass % of a divalent carboxylic acid having 36 to 44 carbon atoms or a mixture obtained by performing hydrogenation with respect to the polymerization reaction mixture; and   composite ester A containing polyester in which monool c1 represented by General Formula (1) described below is condensed,   wherein a feed ratio of the number of moles of a hydroxyl group of a1/the number of moles of a carboxylic acid of b1/the number of moles of a hydroxyl group of c1 is 1/1.5 to 2.0/0.7 to 1.5, and   a content of the composite ester A is 0.1 to 5 mass % with respect to the total mass of the lubricant composition,
   R—OH  General Formula (1):
 
   in General Formula (1), R represents a linear alkyl group having greater than or equal to 8 carbon atoms or a branched alkyl group having greater than or equal to 8 carbon atoms.   
     
     
         2 . The lubricant composition according to  claim 1 ,
 wherein in General Formula (1) described above, R is a linear alkyl group having 8 to 25 carbon atoms or a branched alkyl group having 8 to 25 carbon atoms.   
     
     
         3 . The lubricant composition according to  claim 1 ,
 wherein in General Formula (1) described above, R is a linear alkyl group having 16 to 20 carbon atoms or a branched alkyl group having 16 to 20 carbon atoms.   
     
     
         4 . The lubricant composition according to  claim 1 ,
 wherein in General Formula (1) described above, R is a branched alkyl group.   
     
     
         5 . The lubricant composition according to  claim 1 ,
 wherein the content of the composite ester A is 0.5 to 2 mass % with respect to the total mass of the lubricant composition.   
     
     
         6 . The lubricant composition according to  claim 1 ,
 wherein in a case in which the total number of moles of the hydroxyl group of the number of moles of the hydroxyl group of a1 and the number of moles of the hydroxyl group of c1 is set to P, and the number of moles of the carboxylic acid of b1 is set to Q, a feed ratio of P/Q is 1/0.7 to 0.95.   
     
     
         7 . The lubricant composition according to  claim 1 ,
 wherein a kinematic viscosity of the composite ester A at 40° C. is 500 to 2,000 mm 2 /s.   
     
     
         8 . The lubricant composition according to  claim 1 ,
 wherein the kinematic viscosity at 40° C. is 5 to 100 mm 2 /s.   
     
     
         9 . The lubricant composition according to  claim 1 , further containing:
 a medium,   wherein 0.1 to 5 mass % of the composite ester A is contained, and 70 to 99.9 mass % of the medium is contained, with respect to the total mass of the lubricant composition, and   0 to 29.9 mass % of other components other than the composite ester A and the medium are contained with respect to the total mass of the lubricant composition.   
     
     
         10 . The lubricant composition according to  claim 9 ,
 wherein the medium is at least one type selected from mineral oil, polyolefin oil, ester oil, and ether oil.   
     
     
         11 . The lubricant composition according to  claim 9 ,
 wherein the other components are compounds having at least one type of zinc, molybdenum, sulfur, or phosphorus as a constituent element.   
     
     
         12 . The lubricant composition according to  claim 9 ,
 wherein the other components are at least one type of an organic molybdenum compound or an organic zinc compound.   
     
     
         13 . The lubricant composition according to  claim 1 ,
 wherein the lubricant composition is used as lubricating oil for grease, a releasing agent, oil for an internal combustion engine, oil for metal working (cutting), bearing oil, fuel for a combustion engine, vehicle engine oil, gear oil, operating oil for an automobile, lubricating oil for a vessel and an aircraft, machine oil, turbine oil, hydraulic operating oil, compressor and vacuum pump oil, freezer oil, a lubricating oil agent for metal working, a lubricant for a magnetic recording medium, a lubricant for a micro machine, a lubricant for an artificial bone, or rolling oil.   
     
     
         14 . The lubricant composition according to  claim 1 ,
 wherein the feed ratio of the number of moles of a hydroxyl group of a1/the number of moles of a carboxylic acid of b1/the number of moles of a hydroxyl group of c1 is 1/1.55 to 1.9/0.8 to 1.4.   
     
     
         15 . A manufacturing method of a lubricant composition, comprising:
 obtaining a composite ester A; and   obtaining a lubricant composition in which a concentration of the composite ester A is 0.1 to 5 mass %,   wherein the obtaining the composite ester A is mixing and condensing at least trivalent or more polyol a1, a mixture b1 of at least one of a polymerization reaction mixture of an unsaturated fatty acid having 18 to 22 carbon atoms which contains at least 75 mass % of a divalent carboxylic acid having 36 to 44 carbon atoms or a mixture obtained by performing hydrogenation with respect to the polymerization reaction mixture, and monool c1 represented by General Formula (1) described below such that the number of moles of a hydroxyl group of a1/the number of moles of a carboxylic acid of b1/the number of moles of a hydroxyl group of c1 becomes 1/1.5 to 2.0/0.7 to 1.5,
   R—OH  General Formula (1):
 
   in General Formula (1), R represents a linear alkyl group having greater than or equal to 8 carbon atoms or a branched alkyl group having greater than or equal to 8 carbon atoms.