Ziegler-Natta催化剂制备超高相对分子质量聚1-辛烯  

Preparation of super-high relative molecular weight poly(1-octene) with Ziegler-Natta catalyst

作　　者：徐志鹏[1] 高明智[1] 刘明超[1] 刘海涛[1] 徐秦文 Xu Zhipeng;Gao Mingzhi;Liu Mingchao;Liu Haitao;Xu Qinwen(Sinopec Beijing Research Institute of Chemical Industry,Beijing 100013,China)

机构地区：[1]中国石化北京化工研究院,北京100013

出　　处：《石油化工》2018年第6期557-561,共5页Petrochemical Technology

摘　　要：选取了取代基不同的1,3-二醇酯作为Ziegler-Natta催化剂的内给电子体,在硅油中催化1-辛烯聚合,利用GPC考察了聚合条件对催化剂性能的影响。实验结果表明,低温下聚合得到的聚1-辛烯的相对分子质量在10~6以上,符合作为减阻剂的聚α-烯烃的要求。在制备超高相对分子质量聚1-辛烯时,催化剂的浓度不能太高,尽量使聚合速率缓慢以提高聚合物的相对分子质量。在一定范围内提高铝钛摩尔比能有效提高催化剂活性,但会造成聚1-辛烯相对分子质量的下降。适当降低反应体系温度能提高聚1-辛烯的相对分子质量,但不宜过低。以1,3-二醇酯为内给电子体的Ziegler-Natta催化剂在-10℃左右制备超高相对分子质量聚1-辛烯较适宜。Ziegler-Natta catalysts with 1,3-glycol esters having different substituents as internal electron donors were used to catalyze the polymerization of 1-octene in silicone oil,and the effects of polymerization conditions on the performance of the catalyst were investigated by GPC. The results showed that the poly（1-octene） prepared at a low temperature,of which the relative molecular weight was above 10~6,could meet the requirement on poly（alpha-olefin） as a drag reducing agent. When the super-high MW poly（1-octene） was prepared,light concentration of the catalyst was preferred to make the polymerization rate slow as much as possible so as to increase the MW of the polymer. Raising the Al/Ti molar ratio within a certain range could effectively improve the activity of the catalyst,but would cause reduction of the MW of the poly（1-octene）. Appropriately reducing the temperature of the reduction system could increase the MW of the poly（1-octene）. The temperature,however,should not be too low. Moreover,a temperature around-10 ℃ would be the best for preparation of super-high relative molecular weight poly（1-octene） in the presence of the Ziegler-Natta catalysts with 1,3-glycol esters as the internal electron donors.

关 键 词：1-辛烯 聚Α-烯烃 减阻剂 ZIEGLER-NATTA催化剂 

分 类 号：TQ325.1[化学工程—合成树脂塑料工业]