Investigation on the Selection of Base Oil and Viscosity Index Improver in Internal Combustion Engine Oil
Internal combustion engine oils typically consist of base oils,functional compounds,viscosity index improvers,and pour point depressants.Viscosity index improvers are commonly used functional additives that improve the viscosity-temperature characteristics of lubricants.The performance differences of three viscosity index improvers,namely olefin copolymers(OCP),hydrogenated styrene-diene copolymer(HSD),and polymethacrylate(PMA),in four types of base oils were discussed.Furthermore,the differences in viscosity-temperature performance,low-temperature performance,and shear stability of a specific viscosity grade of internal combustion engine oils which have separately blended with these three viscosity index improvers were examined.A thorough understanding of the performance of different viscosity index improvers in different base oils,and the appropriate selection of base oils and viscosity index improvers,is of significant importance for controlling formulation costs and providing guidance for actual production.(Charts9 Tables3 References8)
base oilinternal combustion engine oilviscosity index improverviscosity-temperature properties
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