Grease composition and rolling bearing

Abstract

The present invention is a grease composition, comprising a fluorine-based grease, a urea-based grease and a soap-based grease (a calcium complex soap thickener, a calcium soap thickener, a barium soap thickener, a magnesium soap thickener or a sodium soap thickener), and a rolling bearing in which the grease composition is filled.

1 . A grease composition, comprising:
 a fluorine-based base oil and a non-fluorine-based base oil, as base oils; and   a fluorine-based thickener, a urea-based thickener and at least one soap-based thickener selected from the group consisting of a calcium complex soap thickener, a calcium soap thickener, a barium soap thickener, a magnesium soap thickener and a sodium soap thickener, as thickeners,   wherein the grease composition comprises:   based on a total amount of the grease composition,   70 mass % to 90 mass % of a total amount of the fluorine-based base oil and the non-fluorine-based base oil;   9 mass % to 18 mass % of the fluorine-based thickener; and   0.5 mass % to 7 mass % of the urea-based thickener.   
     
     
         2 . The grease composition according to  claim 1 , wherein the urea-based thickener contains at least one of an aliphatic-aromatic urea, an alicyclic-aliphatic urea and an aliphatic urea. 
     
     
         3 . The grease composition according to  claim 2 , wherein the urea-based thickener contains a diurea compound represented by the following General Formula (1):
   R 1 —NHCONH—R 2 —NHCONH—R 3   (1)
   (in the formula, R 1  and R 3  each independently represent a monovalent aliphatic hydrocarbon group, a monovalent alicyclic hydrocarbon group or a monovalent aromatic hydrocarbon group, and at least one of R 1  and R 3  represents a monovalent aliphatic hydrocarbon group or a monovalent alicyclic hydrocarbon group, and   R 2  represents a divalent aromatic hydrocarbon group).   
     
     
         4 . The grease composition according to  claim 1 , comprising 0.3 mass % to 3 mass % of the calcium complex soap thickener based on the total amount of the grease composition. 
     
     
         5 . The grease composition according to  claim 4 , wherein the calcium complex soap thickener is a calcium complex soap of an aliphatic dicarboxylic acid and a monoamide monocarboxylic acid. 
     
     
         6 . The grease composition according to  claim 1 , comprising 0.3 mass % to 3 mass % of the calcium soap thickener based on the total amount of the grease composition. 
     
     
         7 . The grease composition according to  claim 1 , comprising 0.6 mass % to 3.6 mass % of the barium soap thickener based on the total amount of the grease composition. 
     
     
         8 . The grease composition according to  claim 1 , comprising 0.6 mass % to 3.6 mass % of the magnesium soap thickener based on the total amount of the grease composition. 
     
     
         9 . The grease composition according to  claim 1 , comprising 0.6 mass % to 3.6 mass % of the sodium soap thickener based on the total amount of the grease composition. 
     
     
         10 . The grease composition according to  claim 1 , wherein the non-fluorine-based base oil is one or more selected from the group consisting of a hydrocarbon-based synthetic oil, an ether-based synthetic oil, an ester-based synthetic oil, and a silicone-based synthetic oil. 
     
     
         11 . A rolling bearing which is filled with the grease composition according to  claim 1 .