关键词: Ziegler-Natta催化剂, Mg/Si载体, 丙烯多段聚合, 抗冲聚丙烯

Abstract: The MgCl₂/SiO₂ complex support was prepared by spray drying using alcoholic suspension which contained MgCl₂ and SiO₂. The complex support reacted with TiCl₄ and di-n-butyl phthalate, give the catalyst for propylene polymerization. The catalyst was spherical and porous with high specific surface area. The multistage polymerization of propylene for high impact propylene was studied with the catalyst system. It was found that the final high impact polypropylene after two stages of reaction was still freeflowing, spherical granules. Homopolypropylene with pore diameter between 100 nm and 10000 nm was suitable for EPR to fill in during ethylene-propylene copolymerization. The high impact polypropylene showed good balance between stiffness and toughness.

Key words: Ziegler-Natta催化剂, Mg/Si载体, 丙烯多段聚合, 抗冲聚丙烯