Lubricant composition

Abstract

Provided is a lubricating oil composition containing a base oil (A), a hindered amine compound (B), and an organic zinc dithiophosphate (C) having at least one primary alkyl group.

1 : A lubricating oil composition, comprising:
 a base oil;   a hindered amine compound; and   an organic zinc dithiophosphate having at least one primary alkyl group.   
     
     
         2 : The lubricating oil composition according to  claim 1 , wherein the organic zinc dithiophosphate comprises a compound of formula (c-1) 
       
         
           
           
               
               
           
         
         where R c1  to R c4  are each independently a primary alkyl group. 
       
     
     
         3 : The lubricating oil composition according to  claim 2 , wherein a number of carbon atoms of the primary alkyl group is 1 to 7. 
     
     
         4 : The lubricating oil composition according to  claim 1 , wherein a content of the organic zinc dithiophosphate is in a range of 0.01 to 7.0 mass % based on a total amount of the lubricating oil composition. 
     
     
         5 : The lubricating oil composition according to  claim 1 , wherein a content of the hindered amine compound is in a range of 0.60 to 10.0 mass % based on a total amount of the lubricating oil composition. 
     
     
         6 : The lubricating oil composition according to  claim 1 , wherein a content ratio by mass of the hindered amine compound to the organic zinc dithiophosphate is in a range of 0.5 to 10.0. 
     
     
         7 : The lubricating oil composition according to  claim 1 , wherein the hindered amine compound comprises at least one selected from a compound of formula (b-1) and a compound of formula (b-2) 
       
         
           
           
               
               
           
         
         where R b1  is each independently a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms, R b2  is a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 18 ring-forming carbon atoms, an aryl group having 6 to 18 ring-forming carbon atoms, a hydroxyl group, an amino group, or a group of —O—CO—R b3 , R b3  is a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, and Z is an alkylene group having 1 to 20 carbon atoms, a cycloalkylene group having 3 to 18 ring-forming carbon atoms, an arylene group having 6 to 18 ring-forming carbon atoms, an oxygen atom, a sulfur atom, or a group of —O—CO—(CH 2 ) n —CO—O— where n is an integer of 1 to 20. 
       
     
     
         8 : The lubricating oil composition according to  claim 1 , further comprising:
 molybdenum dithiocarbamate.   
     
     
         9 : The lubricating oil composition according to  claim 1 , further comprising:
 an antioxidant that does not correspond to the hindered amine compound,   wherein the antioxidant component (E) comprises at least one selected from an amine antioxidant that does not correspond to the hindered amine compound and a phenolic antioxidant.   
     
     
         10 : The lubricating oil composition according to  claim 1 , further comprising:
 an imide compound comprising at least one selected from a non-boron modified alkenyl succinimide and a boron-modified alkenyl succinimide.   
     
     
         11 : The lubricating oil composition according to  claim 10 , wherein the imide compound comprises the non-boron modified alkenyl succinimide and the boron-modified alkenyl succinimide, and a content ratio by mass of the non-boron modified alkenyl succinimide to the boron-modified alkenyl succinimide is less than 5.00. 
     
     
         12 : A lubricating oil composition for an internal combustion engine of a hybrid system, comprising:
 the lubricating oil composition of  claim 1 .   
     
     
         13 : An internal combustion engine, wherein the internal combustion engine is installed in a hybrid system and is filled with the lubricating oil composition of  claim 1 . 
     
     
         14 : A method for lubricating an internal combustion engine, comprising:
 applying the lubricating oil composition of  claim 1  to an internal combustion engine installed in a hybrid system.   
     
     
         15 : The lubricating oil composition according to  claim 2 , wherein a content of the organic zinc dithiophosphate is in a range of 0.01 to 7.0 mass % based on a total amount of the lubricating oil composition. 
     
     
         16 : The lubricating oil composition according to  claim 2 , wherein a content of the hindered amine compound is in a range of 0.60 to 10.0 mass % based on a total amount of the lubricating oil composition. 
     
     
         17 : The lubricating oil composition according to  claim 2 , wherein a content ratio by mass of the hindered amine compound to the organic zinc dithiophosphate is in a range of 0.5 to 10.0. 
     
     
         18 : The lubricating oil composition according to  claim 2 , wherein the hindered amine compound comprises at least one selected from a compound of formula (b-1) and a compound of formula (b-2) 
       
         
           
           
               
               
           
         
         where R b1  is each independently a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms, R b2  is a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 18 ring-forming carbon atoms, an aryl group having 6 to 18 ring-forming carbon atoms, a hydroxyl group, an amino group, or a group of —O—CO—R b3 , R b3  is a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, and Z is an alkylene group having 1 to 20 carbon atoms, a cycloalkylene group having 3 to 18 ring-forming carbon atoms, an arylene group having 6 to 18 ring-forming carbon atoms, an oxygen atom, a sulfur atom, or a group of —O—CO—(CH 2 ) n —CO—O— where n is an integer of 1 to 20. 
       
     
     
         19 : The lubricating oil composition according to  claim 2 , further comprising:
 molybdenum dithiocarbamate.   
     
     
         20 : The lubricating oil composition according to  claim 2 , further comprising:
 an antioxidant that does not correspond to the hindered amine compound,   wherein the antioxidant comprises at least one selected from an amine antioxidant that does not correspond to the hindered amine compound and a phenolic antioxidant.