氯代烷烃促进剂对钛系聚乙烯催化剂的影响

以氯代烷烃化合物为促进剂制备了新型钛系聚乙烯催化剂BCE,并与参比催化剂进行对比。考察了氯代烷烃化合物对BCE催化剂的粒径及其分布、催化活性、氢调敏感性和制得的聚合物性能的影响。实验结果表明,含二氯乙烷的BCE催化剂的粒径及其分布与参比催化剂接近,在相同的聚合条件下,聚合活性高于参比催化剂;二氯乙烷的加入可提高BCE催化剂的氢调敏感性;含二氯乙烷的BCE催化剂制得的聚合物的熔体流动指数大于参比催化剂制得的聚合物,且相对分子质量分布更宽。

Effect of Chloralkane on Titanium-Based Polyethylene Catalyst

A series of titanium-based polyethylene catalysts BCE were prepared with chloralkanes as promoters and were compared with a referenced catalyst.The effects of the chloralkanes on the particle size of catalyst and its distribution,the catalytic activity,the hydrogen responsibility,and the performance of the polymer were investigated.The results indicated that the particle size of BCE catalyst containing dichloroethane and its distribution approximated to the referenced catalyst,while under the same polymerization condition,BCE catalyst containing dichloroethane exhibited higher activity.Dichloroethane could help to increase the hydrogen responsibility of BCE catalyst.The melt index of polymer prepared with BCE catalyst containing dichloroethane is higher than that of polymer prepared with the referenced catalyst.