两相乳化法制备球形Ziegler-Natta催化剂的影响因素及其催化丙烯聚合性能研究

Two Phase Emulsification of Spherical Ziegler-Natta Catalyst and its Performance in Propylene Polymerization

通过两相乳化法制备球形Ziegler-Natta(简称Z-N)催化剂,考察脂肪醇种类、醇镁物质的量比、程序升温速率、氯代烃种类对Z-N催化剂形貌及粒径分布的影响规律,通过SEM、激光粒度仪等对形态和粒度进行表征,并研究其催化丙烯聚合的性能.研究表明:两相乳化法体系内以异辛醇为脂肪醇,醇镁物质的量比设定为2.5,以1–氯丁烷作为卤代烃,程序升温速率0.20℃/min时所制备出催化剂的球形度高且粒径分布窄.聚合评价结果表明其活性高且产物性能良好.

A novel spherical Ziegler-Natta(Z-N)catalyst was prepared with a two-phase emulsification method.A series of operation factors which can influence the morphology and particle size distribution of Z-N catalyst,such as alcohol,molar ratio of alcohol to magnesium,heating rate and chlorinated hydrocarbon,were investigated.The morphology was characterized by SEM and laser particle size analyzer.The catalyst was applied in propylene polymerization.Its activity and the properties of polypropylene products were also studied.The research results showed that isooctyl alcohol,1-chlorobutane,moderate molar ratio of alcohol/magnesium(2.5),and slow heating rate(0.20℃/min)were helpful to obtaining the catalyst with high sphericity and narrow size distribution.Additionally,polypropylene products also presented spherical morphology and adaptively particle distribution.