MgCl_2-SiO_2复合载体型Ziegler-Natta乙烯聚合催化剂  

MgCl_2-SiO_2 Supported Ziegler-Natta Catalyst for Ethylene Polymerization

作　　者：任合刚[1] 张瑞 白鹏[1] 曲佳燕[1] 刘宾元[1] 王延吉[3] 

机构地区：[1]河北工业大学高分子科学与工程研究所,天津300130 [2]中国石油石油化工研究院大庆化工研究中心,黑龙江大庆163714 [3]河北工业大学化工学院绿色化工研究所,天津300130

出　　处：《石油化工》2011年第7期732-736,共5页Petrochemical Technology

基　　金：中国石油天然气股份有限公司资助项目(0604A18-11);高等学校博士学科点专项科研基金项目(200800800002);河北省科技支撑计划项目(09215110D);河北省高等学校科学技术研究指导项目(Z2010129)

摘　　要：采用相同的制备工艺,制备了4种不同SiO2加入量的MgCl2-SiO2复合载体型Ziegler-Natta催化剂,考察了SiO2加入量对催化剂的形态、结构及其催化乙烯聚合性能的影响;并用BET,SEM,XRD等方法对催化剂的形态和物性进行了表征。实验结果表明,加入SiO2可以改善催化剂的颗粒形态和均匀程度;随SiO2加入量的增加,催化剂活性降低,聚乙烯的堆密度和熔体流动指数呈先增大后趋于平稳的趋势;当m(SiO2)∶m(MgCl2)=5.0时,催化剂的形态和性能较好,聚乙烯的堆密度为0.35g/cm3,熔体流动指数(10min)为0.12g,粒径为75～750μm的颗粒的质量分数为98.67%。Four MgCl2-SiO2 supported Ziegler-Natta catalysts were prepared in the same way. The effects of mass ratio of SiO2 to MgCI2 on the catalyst structure and activity in ethylene polymerization were investigated. The catalysts were characterized by means of BET, SEM and XRD. The results indicated that adding SiO2 could improve particle morphology and uniformity of the catalysts. The catalyst activity decreased, and bulk density and melt index of the obtained polyethylene first increased and then almost unchanged along with the increase of SiO2 dosage. When m （ SiO2 ） ： m （ MgCl2 ） was 5.0, the bulk density, the melt index（ 10 min） and the mass fraction in 75 -750μm particle diameter of the produced polyethylene were 0.35 g/cm3, 0.12 g and 98.67%. respectively.

关 键 词：氯化镁-二氧化硅复合载体 ZIEGLER-NATTA催化剂 乙烯聚合 聚乙烯 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]