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烯烃低压聚合催化剂的使用,只不过是近十几年的事,这方面有Ziegler型、金属-过渡金属卤化物系统、可溶性系统。目前生产上应用最广泛的是Ziegler型催化剂,文献上报导很多,它是由两种不同金属化合物作用的结果。催化系统的组分之一是第四族至第八族的过渡元素化合物;而另一成分即是第一族至第三族元素的氫化物或烷基化合物,一般将过渡金属的卤化物认为是催化剂,而金属有机化合物郎认为是助催化剂。最常用的是钛或釩的卤化物加烷基铝或铝的烷基卤化物,不管怎样,催化系统中组分间相互作用生
The use of olefin polymerization catalyst is only a matter of more than a decade. There are Ziegler type, metal-transition metal halide system and soluble system. Currently the most widely used in production is the Ziegler-type catalyst, reported in the literature a lot, it is the result of two different metal compounds. One of the components of the catalytic system is a transition element compound of Groups IV to VIII; and the other component is a hydride or alkyl compound of Group I to III elements, which is generally referred to as a halide of a transition metal Is a catalyst, while a metallo-organic compound is considered a cocatalyst. Most commonly used are the titanium or vanadium halides and the alkyl halides of aluminum alkyls or aluminums. In any event, the interaction between the components of the catalyst system