| 摘要 |
<p> The present invention relates to a viscosity index improver for an internal combustion engine oil, wherein the lubricating oil viscosity index improver is made of at least the following components by weight percent: an ethylene-propylene copolymer of 20-50 parts; polyisobutylene-bis-succinimide of 5-10 parts; polymethacrylate of 1-5 parts; a detergent of 5-8 parts; and a base oil of 50-100 parts. The viscosity index improver for an internal combustion engine oil has good thickening ability, and also has good shear stability. At the same time, it can be conveniently produced, which can effectively reduce the production costs.</p> |
