LUBRICATING OIL COMPOSITION FOR INTERNAL COMBUSTION ENGINES

摘要

A lubricating oil composition for internal combustion engines containing a specific base oil, monoglyceride with a specific structure and ethylene oxide adduct with a specific structure in specific quantities and/or ratios. The lubricating oil composition of the present invention, as well as providing outstanding wear resistance and fuel economy, causes condensed water etc. from water vapour produced as a result of fuel combustion to be dispersed in the oil, so preventing corrosion or rusting of the engine.

主权项

1. A lubricating oil composition for internal combustion engines comprising:
(A) at least one base oil selected from the group consisting of base oils of Groups 2, 3 and 4 in the API (American Petroleum Institute) base oil categories with a kinematic viscosity of from 3 to 12 mm2/s at 100° C. and a viscosity index of from 100 to 180, (B) a monoglyceride with a hydrocarbon group having from 8 to 22 carbon atoms (a glycerine fatty acid ester with the fatty acid ester bonded to one of the three hydroxyl groups of the glycerine), wherein the monoglyceride has a hydroxyl value of from 150 to 300 mgKOH/g, and wherein the monoglyceride is present at a level of from 0.3 to 2.0 mass % based on the total mass of the composition, and (C) at least one ethylene oxide adduct selected from the group consisting of monoalkyl and monoalkenyl amine ethylene oxide adducts shown by Formula (1) below, Formula (1): wherein R is a C14-C22 hydrocarbon group, n and m are independently either 1 or 2, and wherein the ethylene oxide adduct is present at a level of from 0.4 to 1.5 mass % based on the total mass of the composition.