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桥联茂金属催化剂用于双功能催化体系制备LLDPE的研究
PREPARATION OF LLDPE USING A DUAL FUNCTIONAL CATALYTIC SYSTEM OF Ti(OBu)4-METALLOCENE/B(C6F5)3-AlEt3
【摘要】 以四种取代基不同的桥联茂金属作为乙烯共聚催化剂 ,以Ti(OR) 4为二聚催化剂组成双功能原位聚合催化剂体系 ,在同一反应釜中 ,乙烯为唯一聚合单体 ,以阳离子助剂B(C6 F5 ) 3为唯一助催化剂 ,原位制备LLDPE .该聚合体系催化剂活性高、单体插入率高、得到的聚合物为熔点低、分子量可调的超低密聚乙烯
【Abstract】 Polymeriztion of linear low density polyethylene (LLDPE) using a dual functional catalytic system containing different kinds of Metallocene /AlEt 3/B(C 6F 5) 3 as copolymerization catalysts and Ti(O n \|Bu) 4/AlEt 3 as the ethylene dimerization catalyst was studied.Using the single cocatalyst AlEt 3 in the catalytic system,it is easy to overcome the shortcoming of interference between two catalytic metals in a single reactor.Among the four zirconocene systems used,the most active dual functional catalytic system is [Ti(O n \|Bu) 4/AlEt 3/Et(Ind) 2ZrCl 2/B(C 6F 5) 3],its activity reaches 7 5×10 6?gPE/molZr·h.The density of obtained LLDPE is 0 89?g/cm 3 and 1\|butene insertion rate 11 7?mol%.
【Key words】 LLDPE; Dual functional catalytic system; Zirconocene;
- 【文献出处】 高分子学报 ,Acta Polymerica Sinica , 编辑部邮箱 ,2001年04期
- 【分类号】O632
- 【被引频次】27
- 【下载频次】159