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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
This paper introduces a method for the determination of the content of ethylene-propylene copolymer in OCP-based viscosity index improvers such as T611 by solvent extraction. The results show that the method is simple, rapid and accurate