A Lubricating Oil Additive to Suppress Oxidative Viscosity Growth

Abstract

The present invention relates to a lubricating oil additive for inhibiting oxidation viscosity increase. The lubricating oil additive comprises, by weight, A: 7-28% of at least an antioxidant, and B: 72-93% of a viscosity index improver having a random copolymerization molecule chain segment structure, wherein the basic structure unit is as the follow, and a, b, c, x, y and z are integers of more than or equal to 1, and are different. The additive can be used for engine oils, and has characteristics of effective inhibition of viscosity increase caused by oxidation, oil drain interval prolonging, antioxidant consumption reduction, cost saving, and meeting of environmental protection requirements.

Description

technical field [0001] The present invention relates to a lubricating oil additive, especially a lubricating oil additive capable of effectively controlling the viscosity increase caused by oxidation in engine oil. Background technique [0002] Lubricating oil will gradually oxidize under the action of light, heat and oxygen during use. Oxidation will cause the growth of hydrocarbon molecular chains and molecular weight in the lubricating oil, which will cause the viscosity of the lubricating oil to increase, and produce paint film, Deposits such as oil sludge will affect the normal use of the engine. The traditional method is mainly to increase the anti-oxidation performance of the oil by adding the main antioxidant ZDDP and various auxiliary antioxidants to the lubricating oil, thereby delaying the oxidation process of the oil. [0003] At present, the volume of the engine is becoming smaller and smaller, and at the same time, it has higher power. This has led to a subst...

AI Technical Summary

Problems solved by technology

These antioxidant compositions generally require a higher dosage in practical applications, and the price of many antioxidants is relatively expensive, and the application of some sulfur-containing antioxidants in high-grade energy-saving and environment-friendly engine oils is limited.

Therefore, it is necessary to use new and competitive technologies to improve the problems such as the decrease in the anti-oxidation performance of lubricating oil and the increase in viscosity increase caused by the decrease in the amount of ZDDP

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