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High activity Ziegler-Natta catalyst made from Mg powder
Author(s): 
Pages: 16-19,23
Year: Issue:  2
Journal: CHINA SYNTHETIC RESIN AND PLASTICS

Keyword:  聚乙烯镁粉催化剂堆密度颗粒形态;
Abstract: 制备了以球形镁粉为原料的新型乙烯催化剂.通过扫描电子显微镜、激光粒度分析仪等分析和表征了催化剂及预聚物的形态及性能.结果表明:与采用片状镁粉为原料相比,采用球形镁粉为原料制得的预聚物的形态有所改善,流动性由-1级提高到1级.适于制备催化剂的球形镁粉粒径范围为30~70 μm,其活性可达313 mg/(mol·h·Pa).随着碘用量的减小,预聚物堆密度由0.28 g/cm3降至0.25 cm3,而预聚物的平均粒径由155.42 μm提高到186.50μm,细粉含量由27.1%降至14.8%.对预聚物的扫描电子显微镜观察表明,引入SiO2后预聚物形态接近类球形,流动性可达2级(优秀级别).
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