HMT催化乙烯聚合制备纳米复合材料

Preparation of nano-composites via polymerization of ethylene catalyzed by a high activity catalyst

在蒙脱石有机化过程中,采用无水乙醇取代去离子水作为溶剂,使蒙脱石有机化时残留的无水乙醇对MgCl2进行改性,生成活性更高的促进剂烷氧基镁,然后与液态TiCl4反应进行载钛,制备了一种新型蒙脱石负载型催化剂(HMT).采用该高活性催化剂,以'原位配位聚合法'制备出性能优异的聚乙烯/蒙脱石纳米复合材料.HMT活性为MT催化剂的3～4倍,其制备方法简单易行,省略了乙醇脱出步骤、烷基铝处理有机蒙脱石的工序,减少了干燥过程,降低了催化剂的制备成本.

Anhydrous ethanol was selected to replace deionized water as solvent in the organification of montmoril lonite, so that the residual anhydrous ethanol during the organification modified MgCl2 and furthermore, the resultant activity promoter alkoxymagnesium was superior to MgCl2. A high activity montmorillonite supported catalyst (HMT) was prepared through reaction of the treated montmorillonite with liquid TiCl4 for supporting titanium. A kind of polyethylene/montmorillonite nano-composite having outstanding performance was synthe-sized in a process of in-situ polymerization with the HMT. The activity of HMT was 3 or 4 times as high as that of MT catalyst. The process of preparing HMT was relatively easy and simple because the steps of removing ethanol, treating montmorillonite with alkylaluminium and drying were omitted. In addition, the production cost of HMT was also lowered.