Lubricant additive composition, lubricant, and method of preparing the same

Abstract

A lubricant additive composition including: a borate including an alkali metal borate, an alkaline earth metal borate, or a combination thereof; tungsten disulfide including particles having a particle diameter of 4 to 160 nanometers; an anti-scuff agent including a metal dithiocarbamate, a metal dialkyldithiocarbamate, a metal dithiophosphate, a metal dialkyldithiophosphate, or a combination thereof; a borate ester; and a base oil.

What is claimed is: 
     
         1 . A method of manufacturing a lubricant additive composition, the method comprising:
 contacting
 a borate comprising an alkali metal borate, an alkaline earth metal borate, or a combination thereof; 
 tungsten disulfide comprising particles having a particle diameter of 4 to 160 nanometers; 
 a borate ester; 
 an anti-scuff agent comprising a metal dithiocarbamate, a metal dialkyldithiocarbamate, a metal dithiophosphate, a metal dialkyldithiophosphate, or a combination thereof; and 
 a base oil under conditions effective to disperse the borate, the tungsten disulfide, the borate ester, and the anti-scuff agent in the base oil to manufacture the lubricant additive composition. 
   
     
     
         2 . The method of  claim 1 , wherein the conditions effective to disperse the borate, the tungsten disulfide, the borate ester, and the anti-scuff agent in the base oil are effective to form a colloid. 
     
     
         3 . The method of  claim 2 , wherein the conditions effective to form the colloid comprise
 blending for 1 to 100 minutes at 20 to 150° C.,   ultrasonically mixing for 1 to 100 minutes, and   high-shear mixing for 1 to 100 minutes at 20 to 150° C.   
     
     
         4 . The method of  claim 3 , wherein the ultrasonically mixing comprises treatment with a Sonolator for 1 to 100 minutes at 50 to 150° C. 
     
     
         5 . The method of  claim 3 , wherein the high-shear mixing comprises mixing with high-shear mixer at 2000 to 10000 revolutions per minute for 1 to 100 minutes at 50 to 150° C. 
     
     
         6 . The method of  claim 1 , wherein the method further comprises
 settling for 1 to 48 hours after the contacting, and   filtering after the contacting.   
     
     
         7 . A method of manufacturing a lubricant, the method comprising:
 contacting the lubricant additive composition manufactured according to  claim 1  with an additional base oil, wherein the base oil and the additional base oil are the same or different.   
     
     
         8 . A method of lubricating an engine, the method comprising:
 providing the lubricant additive composition according to  claim 1 ; and   adding the lubricant additive to an engine to lubricate the engine.