高等学校化学学报

高等学校化学学报 ›› 1997, Vol. 18 ›› Issue (1): 145.

• 论文 • 上一篇    下一篇

气相法钛系乙烯聚合催化剂的研究──催化剂性质、颗粒形态对乙烯气相聚会及产物颗粒形态的影响

张启兴, 王海华, 伍青, 欧阳巍, 卢泽俭   

  1. 中山大学高分子研究所, 广州, 510275
  • 收稿日期:1996-01-08 出版日期:1997-01-24 发布日期:1997-01-24
  • 通讯作者: 张启兴, 男, 50岁, 副教授.
  • 作者简介:张启兴, 男, 50岁, 副教授.
  • 基金资助:

    中国石油化学工业总公司资助课题

Studies on Ti-Mg Supported Catalysts for the Gas-Phase Polymerization of Ethylene-The Influence of Properties and Morphology of Particle of Catalyst on the Gas-Phase Polymerization of Ethylene and the Morphology of the Product

ZHANG Qi-Xing, WANG Hai-Hua, WU Qing, OU YANG-Wei, LU Ze-Jian   

  1. Institute of Polymer Science, Zhongshan University, Guangzhou, 510275
  • Received:1996-01-08 Online:1997-01-24 Published:1997-01-24

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摘要： 研究了研磨法(CM型)和结晶沉淀反应法(MG－2型)制备的2种乙烯聚合钛系载体催化剂.CM型催化剂含钛3.4％～4.0％,三价钛占总钛含量15％～25％,比表面积为130m2/g,催化剂活性为9.20kgPE/gTi·h,聚合反应衰减快.MG－2型催化剂含钛7.0％～8.0％,三价钛占总钛含量55％～69％,比表面积为78m2/g,催化活性为4.45kgPE/(gTi·h),聚合反应衰减慢,反应平稳.对催化剂和聚合产物的扫描电镜和图象分析研究发现,催化剂颗粒小,颗粒分散度小,则聚会产物颗粒及颗粒分散度就小;反之亦然.当CM型和MG－2型催化剂平均粒径(Dav)和颗粒分散度(Davmax/Davmin)分别为6.8、33μm和9.2、7.0时,相应聚合产物平均粒径和颗粒分散度分别为155、263μm和10.8、9.0.结果表明,聚合产物颗粒形态复现催化剂颗粒形态。

关键词: Ti－Mg系催化剂, 乙烯气相聚合, 颗粒形态

Abstract: Two kinds of Ti-Mg supperted catalysts for gas-phase polymerization of ethylene were studied.The Ti3+ content in the milling-made catalyst (CMtype) containing titanium 3-4%-4.0% by mass is 15%-25% of the total titanium.The surface area of the catalyst and catalytic activity for the polymerization are 130m2/g and 9.20 kg PE/(gTi.h).The polymerization showed quickly decaying kinetics.The Ti3+ content in the reacting-made cat-alyst(MG-2 type) containing titanium 7.0%-8.0% by mass is 55 %-69% of the total tita-nium.The surface area of the catalyst and catalytic activity are 78 m2/g and 4.45 kgPE/(gTi.h).The polymerization was relative steady.The average value of diameter (Dav) and Davmax/Davmin of the CMand MG-2 catalyst particles are 6.8 pm, 33 pm and 9.2, 7.0, respec-tively, and corresponding values of polymerization product PEparticles are 155μm, 263μm,and 10.8, 9.0, respectively.The results indicated that the morphology of the polymerization product reproduced that of the catalyst particle.

Key words: Ti-Mg catalyst, Gas-phase polymerization of ethylene, Morphology of particles

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