Lubricant composition inhibiting adsorption of alpha-olefin, and method and agent for inhibiting adsorption of alpha-olefin

Abstract

A method for inhibiting adsorption of α-olefin in a lubricant composition to a metal surface is disclosed. The lubricant composition comprises any of oils of Group III, Group IV and polyisobutylenes classified into Group V according to the API base oil classification or a mixture thereof as a base oil, and the α-olefin coexisting in an amount of 1% by mass or less based on the total amount of the composition. The method comprises adding a sarcosinic acid derivative, an aspartic acid derivative or a diethanolamine derivative, or a mixture thereof to the lubricant composition.

1 . A lubricant composition comprising any of oils of Group III, Group IV and polyisobutylenes classified into Group V according to the API base oil classification or a mixture thereof as a base oil, and α-olefin coexisting in an amount of 1% by mass or less based on the total amount of the composition, wherein a sarcosinic acid derivative, an aspartic acid derivative or a diethanolamine derivative, or a mixture thereof has been added to the composition. 
     
     
         2 . A lubricant composition according to  claim 1 , wherein the sarcosinic acid derivative is indicated by the following formula 1: 
       
         
           
           
               
               
           
         
         wherein R 1  is a C 16-20  alkyl; 
         wherein the aspartic acid derivative is indicated by the following formula 2: 
       
       
         
           
           
               
               
           
         
         wherein R 2  and R 3  are hydrogen or the same or different C 3-6  alkyl, alkenyl, or hydroxyalkyl; R 4  is a C 1-30  alkyl or alkenyl, a C 1-30  alkyl having an ether bond, or a hydroxyalkyl; and R 5  is a C 1-30  saturated or unsaturated carboxylic acid group, or a C 1-30  alkyl, alkenyl, or hydroxyalkyl; and 
         wherein the diethanolamine derivative is indicated by the following formula 3: 
       
       
         
           
           
               
               
           
         
         wherein R 6  is a C 16-20  alkyl. 
       
     
     
         3 . A lubricant composition according to  claim 1 , wherein the amount of the sarcosinic acid derivative or the diethanolamine derivative is from 0.001 to 3% by mass based on the total amount of the composition, or the amount of the aspartic acid derivative is from 0.005 to 3% by mass based on the total amount of the composition. 
     
     
         4 . A method for inhibiting adsorption of α-olefin in a lubricant composition to a metal surface, the lubricant composition comprising any of oils of Group III, Group IV and polyisobutylenes classified into Group V according to the API base oil classification or a mixture thereof as a base oil, and the α-olefin coexisting in an amount of 1% by mass or less based on the total amount of the composition, which method comprises adding a sarcosinic acid derivative, an aspartic acid derivative or a diethanolamine derivative, or a mixture thereof to the lubricant composition. 
     
     
         5 . A method for inhibiting the adsorption of α-olefin according to  claim 4 , wherein the sarcosinic acid derivative is indicated by the following formula 1: 
       
         
           
           
               
               
           
         
         wherein R 1  is a C 16-20  alkyl; 
         wherein the aspartic acid derivative is indicated by the following formula 2: 
       
       
         
           
           
               
               
           
         
         wherein R 2  and R 3  are hydrogen or the same or different C 3-6  alkyl, alkenyl, or hydroxyalkyl; R 4  is a C 1-30  alkyl or alkenyl, a C 1-30  alkyl having an ether bond, or a hydroxyalkyl; and R 5  is a C 1-30  saturated or unsaturated carboxylic acid group, or a C 1-30  alkyl, alkenyl, or hydroxyalkyl; and 
         wherein the diethanolamine derivative is indicated by the following formula 3: 
       
       
         
           
           
               
               
           
         
         wherein R 6  is a C 16-20  alkyl. 
       
     
     
         6 . A method for inhibiting adsorption of α-olefin according to  claim 4 , wherein the amount of the sarcosinic acid derivative or the diethanolamine derivative added is from 0.001 to 3% by mass based on the total amount of the composition, or the amount of the aspartic acid derivative added is from 0.005 to 3% by mass based on the total amount of the composition.