Grease composition

Abstract

Provided is a grease composition that has high lubricity, particularly excellent wear resistance, and shows only a small extent of deterioration in wear resistance with long-term use under high temperatures. The grease composition comprises at least one base oil selected from a mineral oil-based lubricant base oil and a synthetic lubricant base oil, an amide compound, a solid lubricant, and a urea-based thickener, wherein the amide compound is heated and melted at least once with the base oil.

1 . A grease composition comprising at least one base oil selected from a mineral oil-based lubricant base oil and a synthetic lubricant base oil, an amide compound, a solid lubricant, and a urea-based thickener, wherein the amide compound is heated and melted at least once together with the base oil. 
     
     
         2 . The grease composition according to  claim 1 , wherein the mineral oil-based lubricant base oil and the synthetic lubricant base oil have a kinematic viscosity of 1 to 1000 mm 2 /s at 40° C. 
     
     
         3 . The grease composition according to  claim 1 , wherein the amide compound includes an alkyl group having 6 to 24 carbon atoms. 
     
     
         4 . The grease composition according to  claim 1 , wherein the solid lubricant is at least one selected from melamine cyanulate, polytetrafluoroethylene, and boron nitride. 
     
     
         5 . The grease composition according to  claim 1 , wherein the urea-based thickener is at least one selected from an aliphatic diurea compound, an alicyclic diurea compound, and an aromatic diurea compound. 
     
     
         6 . The grease composition according to  claim 1 , the grease composition being used for lubrication of metal-metal sliding parts. 
     
     
         7 . A method for producing a grease composition that comprises at least one base oil selected from a mineral oil-based lubricant base oil and a synthetic lubricant base oil, an amide compound, a solid lubricant, and a urea-based thickener, wherein the method comprises adding the amide compound to the base oil, followed by heating to melt the amide compound at least once.