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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

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【Author】 LIU Zhongyang, YANG Ling, TAN Zhijun, HE Dawei, HU Youliang (State Key Laboratory of Engineering Plastics, Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080) WU Chunhong (Research Institute of Yanshan P

【机构】中科院化学所分子科学中心工程塑料国家重点实验室!北京100080；中科院化学所分子科学中?；

【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更多还原

【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%.更多还原