高密度聚乙烯种子床物料的物性表征

THE CHARACTERIZATION OF THE PERFORMANCE OF THE HIGH DENSITY POLYETHYLENE AS PRECURSORS

考察了种子床物料ＨＤＰＥ的氧化行为，提出表征其物性的方法。通过测定ＨＤＰＥ的双键指数、羰基指数、结晶度、氧化诱导温度、活化能和介电常数等参数的变化，可以确定种子床物料性能的好坏。

High purity feed stock, high activity catalyst and good seedbed are essential conditions of gas-phase polymerization. The experiment results show that high density polyethylene as precursors in reactor contains double bonds at the end. It will oxidated and produce various carbonyl oxygen-containing radicals which are poisonous to the gasphase polyethylene catalyst. It′s the main reason of HDPE polymerization can′t carry out. For this reason, We presented the method for characterizing the physical property of HDPE seedbed material. We can determine if the seedbed can be used by measuring the changes of the doublebond index, carbonyl index, crystallinity, oxidation inductive temperature, activated energy and dielectric constant and so on.