Lubricating oil composition, method for using same, and method for producing same

Abstract

Provided is a lubricating oil composition, including: a vegetable oil (A); a zinc dithiophosphate (B); and an amine-based antioxidant (C), wherein a total content of linoleic acid and linolenic acid among constituent fatty acids of the vegetable oil (A) is less than 20 mass % with respect to a total amount of the constituent fatty acids in the vegetable oil (A), wherein a content of the amine-based antioxidant (C) is 2.00 mass % or more with respect to a total amount of the lubricating oil composition, and wherein when the lubricating oil composition further includes a phosphorus-free phenol-based antioxidant (D), a content of the phosphorus-free phenol-based antioxidant (D) is less than 2.00 mass % with respect to the total amount of the lubricating oil composition.

1 . A lubricating oil composition, comprising:
 a vegetable oil (A);   a zinc dithiophosphate (B); and   an amine-based antioxidant (C),   wherein a total content of linoleic acid and linolenic acid among constituent fatty acids of the vegetable oil (A) is less than 20 mass % with respect to a total amount of the constituent fatty acids in the vegetable oil (A),   wherein a content of the amine-based antioxidant (C) is 2.00 mass % or more with respect to a total amount of the lubricating oil composition, and   wherein when the lubricating oil composition further comprises a phosphorus-free phenol-based antioxidant (D), a content of the phosphorus-free phenol-based antioxidant (D) is less than 2.00 mass % with respect to the total amount of the lubricating oil composition.   
     
     
         2 . The lubricating oil composition according to  claim 1 , wherein a content of oleic acid among the constituent fatty acids of the vegetable oil (A) is 65 mass % or more with respect to the total amount of the constituent fatty acids in the vegetable oil (A). 
     
     
         3 . The lubricating oil composition according to  claim 1 , wherein a content of the zinc dithiophosphate (B) is 0.10 mass % or more with respect to the total amount of the lubricating oil composition. 
     
     
         4 . The lubricating oil composition according to  claim 1 , wherein the amine-based antioxidant (C) comprises a diphenylamine-based antioxidant (C1) and a naphthylamine-based antioxidant (C2). 
     
     
         5 . The lubricating oil composition according to  claim 4 , wherein the diphenylamine-based antioxidant (C1) is a compound represented by the following general formula (c1-1): 
       
         
           
           
               
               
           
         
         wherein in the general formula (c1-1), R c11  and R c12  each independently represent an alkyl group having 1 to 30 carbon atoms, and nc11 and nc12 each independently represent an integer of from 1 to 5. 
       
     
     
         6 . The lubricating oil composition according to  claim 4 , wherein the naphthylamine-based antioxidant (C2) is a compound represented by the following general formula (c2-1): 
       
         
           
           
               
               
           
         
         wherein in the general formula (c2-1), R c21  represents an alkyl group having 1 to 30 carbon atoms, and nc21 represents an integer of from 1 to 5. 
       
     
     
         7 . The lubricating oil composition according to  claim 1 , further comprising a zinc dithiocarbamate (E). 
     
     
         8 . The lubricating oil composition according to  claim 1 , further comprising a phosphorus-comprising phenol-based antioxidant (F). 
     
     
         9 . The lubricating oil composition according to  claim 1 , further comprising one or more kindsat least one selected from the group consisting of: a metal deactivator; a rust inhibitor; and an antifoaming agent. 
     
     
         10 . The lubricating oil composition according to  claim 1 , wherein the lubricating oil composition is formulated for use as an industrial equipment oil. 
     
     
         11 . A method of lubricating, comprising applying the lubricating oil composition according to  claim 1  to industrial equipment. 
     
     
         12 . A method of producing a lubricating oil composition, comprising mixing a vegetable oil (A), a zinc dithiophosphate (B), and an amine-based antioxidant (C) to prepare the lubricating oil composition,
 wherein a total content of linoleic acid and linolenic acid among constituent fatty acids of the vegetable oil (A) is less than 20 mass % with respect to a total amount of the constituent fatty acids in the vegetable oil (A),   wherein a blending amount of the amine-based antioxidant (C) is 2.00 mass % or more with respect to a total amount of the lubricating oil composition, and   wherein when the lubricating oil composition is further blended with a phosphorus-free phenol-based antioxidant (D), a blending amount of the phosphorus-free phenol-based antioxidant (D) is less than 2.00 mass % with respect to the total amount of the lubricating oil composition.