Lubricating grease composition

Abstract

The present invention aims to improve the extreme-pressure properties and compatibility with seals of lubricating grease compositions used at lubrication points where extreme-pressure properties and seal-resistance properties at high loads are required in various kinds of machinery. To this end the present invention provides a lubricating grease composition wherein from 0.1 to 3% by weight of a molybdenum dialkyl dithiocarbamate, from 0.1 to 3% by weight of benzothiazole compounds and from 0.1 to 3% by weight of calcium sulphonates are incorporated in a grease in which a thickening agent is blended in the base oil.

1 . A lubricating grease composition comprising a base oil, the composition further comprising: (A) from 0.1 to 3% by weight of a molybdenum dialkyl dithiocarbamate; (B) from 0.1 to 3% by weight of one or more benzothiazole compounds; and (C) from 0.1 to 3% by weight of one or more calcium sulphonates. 
   
   
       2 . A lubricating grease composition according to  claim 1  wherein the molybdenum dialkyl dithiocarbamate has the Formula 1 below, 
     
       
         
         
             
             
         
       
     
     wherein R is an alkyl group having from 1 to 24 carbon atoms. 
   
   
       3 . A lubricating grease composition according to  claim 1  wherein the one or more benzothiazole compounds include at least one of 2-mercaptobenzothiazole, or a derivative thereof having the Formula 2, 
     
       
         
         
             
             
         
       
     
     wherein R1 denotes an alkyl group having from 1 to 10 carbons or an alkyl mercapto group. 
   
   
       4 . A lubricating grease composition according to  claim 1  wherein the one or more benzothiazole compounds include N-tert-butyl-2-benzothiazolylsulphenamide, N-cyclohexyl-2-benzothiazolylsulphenamide, N-oxydiethylene-2-benzothiazolylsulphenamide or 2-(4-morpholinyldithio)benzothiazole. 
   
   
       5 . A lubricating grease composition according to  claim 1  further comprising a thickening agent. 
   
   
       6 . Use of the lubricating grease composition according to  claim 1  at lubrication points where extreme-pressure properties and seal-resistance properties at high loads are required. 
   
   
       7 . Method for improving the lubrication at lubrication points where extreme-pressure properties and seal-resistance properties at high loads are required, by using the lubricating grease composition according to  claim 1 . 
   
   
       8 . A lubricating grease composition according to  claim 2  wherein the one or more benzothiazole compounds include at least one of 2-mercaptobenzothiazole, or a derivative thereof having the Formula 2, 
     
       
         
         
             
             
         
       
     
     wherein R1 denotes an alkyl group having from 1 to 10 carbons or an alkyl mercapto group. 
   
   
       9 . A lubricating grease composition according to  claim 2 , wherein the one or more benzothiazole compounds include N-tert-butyl-2-benzothiazolylsulphenamide, N-cyclohexyl-2-benzothiazolylsulphenamide, N-oxydiethylene-2-benzothiazolylsulphenamide or 2-(4-morpholinyldithio)benzothiazole. 
   
   
       10 . A lubricating grease composition according to  claim 3 , wherein the one or more benzothiazole compounds include N-tert-butyl-2-benzothiazolylsulphenamide, N-cyclohexyl-2-benzothiazolylsulphenamide, N-oxydiethylene-2-benzothiazolylsulphenamide or 2-(4-morpholinyldithio)benzothiazole. 
   
   
       11 . A lubricating grease composition according to  claim 2  further comprising a thickening agent. 
   
   
       12 . A lubricating grease composition according to  claim 3  further comprising a thickening agent. 
   
   
       13 . A lubricating grease composition according to  claim 4  further comprising a thickening agent. 
   
   
       14 . Use of the lubricating grease composition according to  claim 2  at lubrication points where extreme-pressure properties and seal-resistance properties at high loads are required. 
   
   
       15 . Use of the lubricating grease composition according to  claim 3  at lubrication points where extreme-pressure properties and seal-resistance properties at high loads are required. 
   
   
       16 . Use of the lubricating grease composition according to  claim 4  at lubrication points where extreme-pressure properties and seal-resistance properties at high loads are required. 
   
   
       17 . Use of the lubricating grease composition according to  claim 5  at lubrication points where extreme-pressure properties and seal-resistance properties at high loads are required. 
   
   
       18 . Method for improving the lubrication at lubrication points where extreme-pressure properties and seal-resistance properties at high loads are required, by using the lubricating grease composition according to  claim 2 . 
   
   
       19 . Method for improving the lubrication at lubrication points where extreme-pressure properties and seal-resistance properties at high loads are required, by using the lubricating grease composition according to  claim 3 . 
   
   
       20 . Method for improving the lubrication at lubrication points where extreme-pressure properties and seal-resistance properties at high loads are required, by using the lubricating grease composition according to  claim 4 .