新型负载型Ziegler-Natta催化剂用于乙烯聚合  

Novel Supported Ziegler-Natta Catalyst for Ethylene Polymerization

作　　者：刘伟[1,2] 程璐[2] 余朦山[2] 刘智[2] 黄启谷[2] 义建军 

机构地区：[1]常州大学材料科学与工程学院,江苏常州213164 [2]北京化工大学化工资源有效利用国家重点实验室碳纤维及功能高分子教育部重点实验室,北京100029 [3]中国石油石油化工研究院,北京100083

出　　处：《石油化工》2013年第4期379-383,共5页Petrochemical Technology

基　　金：国家自然科学基金项目(21174011);北京市自然科学基金项目(2102036);中石油创新基金项目(2011D-5006-0502)

摘　　要：采用原位生成载体和活性中心的方法,以Mg(C2H5)2与SiCl4反应生成载体、Ti(OBu)4与SiCl4反应生成金属活性中心制备了一种新型高性能负载型Ziegler-Natta乙烯聚合催化剂(CatⅠ)。利用ICP、SEM、粒度分析仪和GPC等方法研究了CatⅠ的组成、形态、粒径分布及采用CatⅠ制得的聚乙烯的形态与性能,并与商业催化剂进行了对比。表征结果显示,CatⅠ的载Ti量较高、粒径分布均匀且催化剂颗粒呈规整的球形;采用CatⅠ制得的聚乙烯堆密度大、细粉含量低、相对分子质量分布较宽、颗粒呈规整的类球形且分布均匀。在相同聚合条件下,CatⅠ的氢调敏感性能优于商业催化剂,因此有利于对聚乙烯产品的性能进行调控。A novel supported Ziegler-Natta catalyst（Cat I ） for ethylene polymerization was prepared by the in situ reactions of Mg（C2Hs）2 with SiC14 and Ti（OBu）4 with SIC14, which were used in the preparation of the support and transition metal active centers, respectively. The composition, particle morphology and particle size distribution of Cat I and the morphology and properties of the synthesized PE were investigated by means of ICP, SEM, particle size analyzer and GPC, and compared with those of a commercial catalyst（Cat II ）. The results showed that the Ti content in Cat I was higher, its particle size distribution was uniform and its particles were spherical. The PE obtained by Cat I had higher bulk density, lower fines content and wider molecular weight distribution. And the PE particles were spherical-like and their size distribution was uniform. Cat I was more sensitive to hydrogen than Cat 11 under the same conditions, so it would be favorable for controlling the properties of polyethylene.

关 键 词：负载型Ziegler-Natta催化剂 乙烯聚合 聚乙烯 

分 类 号：TQ426.94[化学工程]