制造单层汽车油箱的HDPE基础树脂的研究

采用本院研制的Ｔｉ－Ｍｇ系高效催化剂和烷基铝化合物，在２Ｌ不锈钢压力釜内，模拟两釜串联聚合方式进行乙烯两段聚合。研究了氢浓度、催化剂用量及前后两段聚合所得聚合物的质量比对聚合物相对分子质量大小和相对分子质量分布的影响以及共聚单体１－丁烯浓度与聚合物密度的关系。在经选定的较佳聚合工艺条件下，制备出高相对分子质量、具“双峰”型的宽相对分子质量分布的乙烯与１－丁烯共聚的ＨＤＰＥ树脂，其各项性能指标与德国进口的单层汽车油箱专用料的基础树脂ＧＭ７７４６的性能相当。

Preparation and Investigation of a HDPE Resin for Sigle Layer Automobile Fuel Tank

A series of HDPE resins have been prepared by using a Ti Mg high activity catalyst,which is synthesized by our institute,and alkyl aluminum in a 2 liter stainless steel autoclave The polymerization was carried out in two stages to simulate the polymerization conditions of two reactors connected in series The effects of H 2 partial pressure and the amount of catalyst as well as the weight ratio of the two stages products on polymer molecular weight and MWD were investigated The relation between comonomer 1 butene and the polymer density were studied Under the selected preferred polymerization conditions,a series of copolymers of ethylene and 1 butene with high molecular weight and “bimodal” wide MWD were prepared These products have good properties similar to those of imported automobile fuel tank materials