Lubricating oil composition serving as sliding surface oil and metal working oil, and method of lubricating working machinery using said oil composition

摘要

A method of lubricating a metal working machine which has (i) at least one sliding machine surface requiring lubication and (ii) a metal working section wherein metal is worked in contact with a metal working fluid, said method comprises applying a lubricating oil composition to said at least one sliding surface and using as said metal working fluid an aqueous working fluid composition comprising said lubricating oil composition diluted with water, said lubricating composition comprising; (A) 5 to 88% by weight of at least one oil selected from the group consisting of a mineral oil and a synthetic oil, (B) 2 to 50% by weight of a reaction product of a long chain dibasic acid having 14 to 28 carbon atoms and an alkanolamine, (C) 5 to 30% by weight of at least one extreme pressure additive selected from the group consisting of sulfurized fat and oil, a phosphate, a phosphite, and an amine salt of phosphate or phosphite (D) 5 to 30% by weight of an emulsifying agent selected from the group consisting of an anionic surface active agent, a cationic surface active agent, a nonionic surface active agent and a phosphorus-containing surface active agent. The invention also provides the lubricating oil composition specified hereinbefore.