高等学校化学学报 ›› 1995, Vol. 16 ›› Issue (3): 481.

• 论文 • 上一篇    下一篇

Ti-Mg系载体催化剂预聚合对乙烯气相聚合及产物颗粒形态的影响

张启兴, 伍青, 欧阳巍, 卢泽俭, 王海华   

  1. 中山大学高分子研究所, 广州 510275
  • 收稿日期:1994-04-20 修回日期:1994-08-02 出版日期:1995-03-24 发布日期:1995-03-24
  • 通讯作者: 张启兴,男,49岁,副教授.
  • 作者简介:张启兴,男,49岁,副教授.
  • 基金资助:

    国家自然科学基金

The Influence of Prepolymerization with Ti-Mg Supported Catalyst on the Gas-phase Polymerization of Ethylene and the Morphology of the PE Particles

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

  1. Institute of Pofymer Science, Zhongshan University, Guangzhou 510275
  • Received:1994-04-20 Revised:1994-08-02 Online:1995-03-24 Published:1995-03-24

摘要: 研究了Ti-Mg系载体催化剂经预聚合与未经预聚合的乙烯气相聚合反应。结果表明,预聚合使催化活性增大、产物堆密度增大、颗粒大小均匀。扫描电镜观察表明,预聚合使催化剂颗粒疏松、多缝隙。预聚物、聚合产物颗粒分别由细小的二级类球形粒子紧密聚集而成,二级粒子则由更细小的一级粒子组成。图象分析测得催化剂、预聚物、聚合产物颗粒平均粒径分别是33、168、263μm,长短轴之比(D/d)分别是1.524、1.540、1.514.

关键词: Ti-Mg系催化剂, 预聚合反应, 乙烯气相聚合, 颗粒形态

Abstract: The gas-phase polymerization of ethylene with prepolymerized Ti-Mg supported catalyst was studied. The results showed that catalytic activity and bulk density of the prod uct particles increased and the size distributions of the product particles narrowed with the using of prepolymerization method. The morphology of catalyst particles, prepolymer and the polymerization product particles were studied by SEM and image analysis. From these investigation, it was found that the prepolymerization makes catalyst particles puff with fis sure. The particles of prepolymer and polymerization product are composed of bound ag glomerates of fine secondary polymer globules, while the secondary polymer globules consist of smaller primary particles. The average values of diameters (DAV) of catalyst particles,prepolymer and the product particles by image analysis are 33um, 168 um and 263 um, re-spectively, and the ratios of the large axis to small axis(D/d) are 1. 524, 1. 540 and 1. 514,respectively.

Key words: Ti-Mg catalyst, Prepolymerization, Gas-phase polymerization of ethylene, Mor phology of particles

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