关键词: 黏度指数改进剂, 烯烃, 黏温性能, 分散性能, 减摩抗磨性能, 剪切稳定性, 生物降解性能

Abstract:

Viscosity-temperature characteristics is a key index of lubricating oil. Viscosity-temperature characteristics of lubricating oil were improved by added viscosity index improvers so that lubricating oil have a low enough viscosity at low temperatures to flow and thicken viscosity at high temperatures to get a useful viscosity. With the increasingly international stringent regulations and requirements for energy conservation and emission reduction, low-viscosity and energy-saving lubricating oil have begun to attract the attention of lube oil manufacturer. Polymethacrylate polymers (PMA) are rejuvenated and have attracted people’s attention. The demand for PMA viscosity index improvers in lubricating oil formulations is increasing. Although PMA have low viscosity, high viscosity index and excellent low temperature performance, they have poor thermal stability, and shear stability. In order to improve the performance of PMA, it is necessary to introduce different olefin monomers to copolymerize with alkyl methacrylate. This article introduced the research status of PMA viscosity index improvers by domestic and foreign researchers, and summarized them based on the classification of different functional olefin monomers. The effects of different olefin monomers on the properties of PMA viscosity index improvers were analyzed. By introducing monomers contained polar functional group, alkyl olefin monomers, aryl olefin monomers and plant-based olefin monomers, PMA were endowed with dispersion, shear stability, wear resistance, friction reduction and biodegradability. This article provided guidance and reference for the development of new multifunctional viscosity index improvers.

Key words: viscosity index improvers, olefins, viscosity-temperature characteristics, dispersibility, friction-reduction and anti-wear properties, shear stability, biodegradability