淤浆法聚乙烯催化剂的表征及其聚合性能

Characteristic and catalytic performance of the catalyst for polyethylene via slurry process

采用激光粒径分析仪、比表面积测定仪等对自制CAT-P型催化剂、进口CAT-Z型催化剂及国产CAT-B型催化剂的粒径分布及微观结构进行了表征,并研究了催化剂的活性、动力学行为、氢调敏感性及聚合性能等。结果表明:与CAT-Z型、CAT-B型催化剂相比,CAT-P型催化剂的比表面积和孔径较大,粒径分布跨度较小,为1.36,说明其粒径分布更集中;CAT-P型催化剂的氢调敏感性与CAT-Z型催化剂相当,优于CAT-B型催化剂;用CAT-Z型、CAT-P型催化剂制备的聚乙烯的密度明显下降,说明其具有较好的聚合性能。

Particle size distributions and microstructures of the homemade CAT-P catalyst, the imported CAT-Z catalyst and the domestic CAT-B catalyst were characterized by using laser particle size analyzer and specific surface area measurement. And the activity, kinetics, hydrogen sensitivity and polymerization perfor-mance etc. of the catalysts were studied. The results show that the surface area and the pore diameter of the CAT-P catalyst is much bigger, and its particle distribution is more concentrated with the particle size span of 1.36 compared with CAT-Z catalyst and CAT-B catalyst. The hydrogen sensitivity of CAT-P catalyst is similar to that of CAT-Z catalyst and better than that of CAT-B catalyst. The density of the polyethylene prepared with CAT-Z catalyst and CAT-P catalyst decreased significantly, which shows that they have outstanding polymerization performance.