Adaptability of Different Viscosity Index Improvers in Oil Products
Release time:
2022-12-07
Viscosity index improver (VII) not only has strong viscosity-increasing ability and good shear stability, but also has good low-temperature performance and thermal-oxidative stability. In actual production, different oil products have different emphasis on choosing viscosity index agent.
Selectivity of Viscosity Index Improvers in Multigrade Internal Combustion Engine Oils
Viscosity increasing ability is a very important performance of viscosity index improver. The greater the viscosifying ability of the viscosity index improver, the smaller the amount added, and the lower the cost of the multi-grade oil. The viscosity-increasing ability is mainly related to the molecular weight of the viscosity index improver, the carbon number [—CH2—] of the main chain on the molecule, and the form in the base oil. The viscosity-increasing ability order of commonly used viscosity index improvers is as follows: ethylene-propylene copolymer>polyisobutylene>styrene-butadiene copolymer>polymethacrylate, and the viscosity index improver (VII) as an ethylene-propylene copolymer increases Sticking ability is undoubtedly the strongest.
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