A solvent extraction method for determinating ethylene/propylene copolymer content in OCP type viscosity index improver was introduced. The analytical results indicated that the method was simple, convenient, rapid and accurate.

• 介绍一种用溶剂抽提法对T611等OCP型粘度指数改进剂中乙丙共聚物含量的测定方法，结果表明该方法操作简便、快速准确