Grease composition

Abstract

Provided herein is a grease composition capable of reducing an amount of wear in sliding parts of various members of automobiles, electrical devices, and the like. The grease composition includes a lubricant base oil, a thickener, an amide compound, and at least one of an α-hydroxycarboxylic acid metal salt, and an ω-hydroxycarboxylic acid metal salt. The hydroxycarboxylic acid metal salts are contained in a total content of 0.1 to 2 mass % with respect to the total amount of the grease composition.

1 . A grease composition comprising:
 a lubricant base oil;   a thickener;   an amide compound; and   at least one of an α-hydroxycarboxylic acid metal salt, and an ω-hydroxycarboxylic acid metal salt,   wherein the hydroxycarboxylic acid metal salts are contained in a total content of 0.1 to 2 mass % with respect to a total amount of the grease composition.   
     
     
         2 . The grease composition according to  claim 1 , wherein the hydroxycarboxylic acid metal salt is an alkali metal salt, or an alkali earth metal salt. 
     
     
         3 . The grease composition according to  claim 2 , wherein the hydroxycarboxylic acid metal salt is a calcium salt, or a barium salt. 
     
     
         4 . The grease composition according to  claim 1 , wherein the hydroxycarboxylic acid is a monovalent hydroxycarboxylic acid of 8 to 24 carbon atoms. 
     
     
         5 . The grease composition according to  claim 1 , wherein the thickener contains at least one of a urea-based thickener, and a metal soap-based thickener. 
     
     
         6 . The grease composition according to  claim 1 , which further comprises a solid lubricant component. 
     
     
         7 . A lubrication method comprising using the grease composition of  claim 1  at a sliding part.