High-temperature lubricant composition

Abstract

A lubricating oil composition for high-temperature applications contains: a component (A) that is an aromatic ester; and a component (B) that is a poly-alpha-olefin having a viscosity index of 140 or more. A content of the component (A) is preferably in a range from 10 mass % to 95 mass % of a total amount of the composition. A content of the component (B) is preferably in a range from 50 mass % or less of the total amount of the composition.

1 . A lubricating oil composition for high-temperature applications, comprising: a component (A) that is an aromatic ester; and
 a component (B) that is a poly-alpha-olefin having a viscosity index of 140 or more.   
     
     
         2 . The lubricating oil composition according to  claim 1 , wherein
 a content of the component (A) is in a range from 10 mass % to 95 mass % of a total amount of the composition, and   a content of the component (B) is 50 mass % or less of the total amount of the composition.   
     
     
         3 . The lubricating oil composition according to  claim 2 , wherein
 the content of the component (A) is in a range from 30 mass % to 80 mass % of the total amount of the composition, and   the content of the component (B) is 40 mass % or less of the total amount of the composition.   
     
     
         4 . The lubricating oil composition according to  claim 1 , wherein
 the aromatic ester of the component (A) is a pyromellitate ester or a trimellitate ester, and   a content of the component (A) is 80 mass % or less of the total amount of the composition.   
     
     
         5 . The lubricating oil composition according to  claim 4 , wherein
 the aromatic ester of the component (A) is a pyromellitate ester.   
     
     
         6 . The lubricating oil composition according to  claim 1 , wherein
 the component (B) has a kinematic viscosity at 100 degrees C. in a range from 10 mm 2 /s to 400 mm 2 /s.   
     
     
         7 . The lubricating oil composition according to  claim 1 , wherein
 the component B is a poly-alpha-olefin manufactured using a metallocene catalyst.   
     
     
         8 . The lubricating oil composition according to  claim 1 , further comprising:
 a component (C) that is a thickener and has a kinematic viscosity at 40 degrees C. of 100 mm 2 /s or more.   
     
     
         9 . The lubricating oil composition according to  claim 8 , wherein
 the component (C) is polybutene having a mass average molecular weight of 1000 to 3000, and   a content of the component (C) is 50 mass % or less of the total amount of the composition.   
     
     
         10 . The lubricating oil composition according to  claim 1 , further comprising:
 a component (D) that is a sulfur-containing triazine antioxidant.   
     
     
         11 . The lubricating oil composition according to  claim 1 , further comprising:
 a component (E) that is a thiophosphoric acid ester antioxidant.   
     
     
         12 . The lubricating oil composition according to  claim 1 , further comprising:
 a component (F) that is an amine antioxidant.   
     
     
         13 . The lubricating oil composition according to  claim 1 , wherein
 the lubricating oil composition is used in a contact portion between a resin and a metal in use under an atmosphere of a temperature of 150 degrees C. or more.   
     
     
         14 . The lubricating oil composition according to  claim 13 , wherein
 the resin is engineering plastics.   
     
     
         15 . The lubricating oil composition according to  claim 1 , wherein
 the lubricating oil composition is used in one of a chain, a gear and a bearing.