Lubricant Composition

Abstract

A lubricant composition, which comprises a fluoro-oil, a powdery fluororesin thickener, and Ca salt or Na salt of aromatic sulfonic acid or saturated aliphatic dicarboxylic acid as a rust-inhibitive additive, where the thickener is in a proportion of 10-40% by weight, and the additive is in a proportion of 0.3-10% by weight, on the basis of total weight of the composition, the balance being the fluoro-oil. The lubricant composition containing the powdery fluororesin in an appropriate admixing proportion as a thickener in the fluoro oil has a distinguished rust inhibition, particularly even after having being subjected to heat hysteresis, where a perfluoropolyether oil is usually used as a fluoro-oil.

1 . A lubricant composition, which comprises a fluoro-oil, a powdery fluororesin thickener, and Ca salt or Na salt of aromatic sulfonic acid or saturated aliphatic dicarboxylic acid as a rust-inhibitive additive, where the thickener is in a proportion of 10-40% by weight, and the additive is in a proportion of 0.3-10% by weight on the basis of the total weight of the composition, the balance being the fluoro-oil. 
   
   
       2 . A lubricant composition according to  claim 1 , wherein the fluoro-oil is a perfluoropolyether, represented by the following general formula: 
     (where Rf and Rf are the same of different perfluoroalkyl groups having 1-5 carbon atoms, x+y+z is 3-200, and x and y may be zero), or a perfluoropolyether, represented by the following general formula:
   F(CF 2 CF 2 CF 2 O) n C 2 F 5   [II] 
 
     (where n is an integer of 2-100) 
   
   
       3 . A lubricant composition according to  claim 2 , wherein the perfluoropolyether represented by the general formula [I] is at least one of perfluoropolyethers represented by the following general formulae:
   RfO(CF 2 CF 2 O) m (CF 2 O) n Rf  (1)   
     (where m+n=3-200, m:n=10−90:90−10, and the CF 2 CF 2 O group and the CF 2 O group are in random combination in the main chain),
   RfO[CF(CF 3 )CF 2 O] p (CF 2 CF 2 O) q (CF 2 O) r Rf  (2) 
 
     (where p+q+r=3-200, q and r may be zero, (g+r)/p=0−2, and the CF(CF 3 )CF 2 O group, the CF 2 CF 2 O group and the CF 2 O group are in random combination in the main chain), and
   RfO[CF(CF 3 )CF 2 O](CF 2 CF 2 O) t Rf  (3) 
 
     (where s+t=3-200, t may be zero, t/s=0−2, and the CF(CF 3 )CF 2 O group and CF 2 CF 2 O group are in random combination in the maim chain) 
   
   
       4 . A lubricant composition according to  claim 1 , further comprising another thickener. 
   
   
       5 . A lubricant composition according to  claim 2 , further comprising another thickener. 
   
   
       6 . A lubricant composition according to  claim 3 , further comprising another thickener. 
   
   
       7 . A lubricant composition according to  claim 1 , for use as a grease. 
   
   
       8 . A lubricant composition according to  claim 2 , for use as a grease. 
   
   
       9 . A lubricant composition according to  claim 3 , for use as a grease.