助催化剂和己烯对MgCl_2/SiO_2复合载体型Ziegler-Natta催化剂催化乙烯聚合的影响  

Effect of Cocatalyst and 1-Hexene on the MgCl_2/SiO_2 Supported Ziegler-Natta Catalyst for Ethylene Polymerization

作　　者：任合刚[1,2] 王路海 杨敏[1] 曲佳燕[1] 刘宾元[1] 王延吉[4] 

机构地区：[1]河北工业大学化工学院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]中国石油石油化工研究院,北京100190 [4]河北工业大学化工学院绿色化工研究所,天津300130

出　　处：《高分子材料科学与工程》2013年第3期64-68,共5页Polymer Materials Science & Engineering

基　　金：河北省科技支撑计划资助项目(09215110D)

摘　　要：采用MgCl2/SiO2复合载体制备了一种乙烯聚合催化剂。考察了烷基铝种类、铝钛配比和1-己烯加入量对乙烯聚合性能的影响,并利用激光粒度分布仪、扫描电镜(SEM)和X射线衍射(XRD)对催化剂的形态和物性进行了表征,用差示扫描量热(DSC)、红外光谱(FT-IR)和凝胶渗透色谱(GPC)对聚合产物进行了分析。结果表明,催化剂保持了良好的颗粒形态和均匀程度;三异丁基铝(Al(iBu)3)为助催化剂所得的聚合活性和共聚能力高于三乙基铝(AlEt3)为助催化剂的催化体系。Al(iBu)3活化体系的活性中心分布与AlEt3活化体系有显著的差别。A Ziegler-Natta catalyst was synthesized for ethylene polymerization using SiO2-MgCl2 composite as carrier. The effects of type of cocatalyst, A1/Ti molar ratio and comonomer concentration on the performance of ethylene polymerization were investigated. The catalyst was characterized by laser granulometer, SEM and XRI）. Copolymers were characterized using DSC, FT-IR and GPC. The results indicate that the catalyst remains good particle morphology and uniformity. Al（i-Bu）3 as cocatalyst in the catalytic system shows higher activity and copolymerizability than A1Et3. The distributions of active centers in both the Al（i-Bu）3 and A1Et3 as cocatalyst wer studied by deconvolution of molecular weight distribution curves of the polymer with muhiple Schulz-Flory most probable distribution function. The active center distribution of Al（i-Bu）3 and A1Et3 as cocatalyst in the catalylic system represents remarkable difference.

关 键 词：MGCL2 SiO2复合载体 ZIEGLER-NATTA催化剂 助催化剂 共聚合 

分 类 号：TQ314.242[化学工程—高聚物工业]