N催化剂在丙烯聚合反应中的应用Ⅰ.预聚与预络合对N催化剂聚合性能的影响

考察了丙烯预聚、预络合对N催化剂聚合性能的影响，结果表明，预络合有助于提高催化剂的聚合活性以及聚合物的表观密度，提高催化剂的抗杂质干扰能力，预聚除能够提高催化剂的活性外，对提高聚丙烯粉料的表观密度和等规指数，减少聚丙烯颗粒的破碎有显著影响。

Study on application of N catalyst for propylene polymerization Ⅰ. Effects of pre-polymerization and pre-compounding on the polymerization of propylene with N catalyst

The paper studied the effect of the pre-treatment on the polymerization performance of N catalyst. The result shows that pre-compounding benefits raising polymerization activity of the catalyst and bulk density of the polypropylene (PP) product and strengthening the resistance to impurity of the catalyst. Besides increas ing the catalyst activity, the pre-polymerization can not only raise the bulk density and isotacticity of the PP product, but also significantly diminish the cracking of the PP powders.