烯烃聚合催化剂种类繁多,改变金属离子或配位体能得到性能不同的烯烃聚合催化剂.可供选择的助催化剂主要有烷基铝,烷基氯化铝,铝氧烷和Cp_2MtMe化合物等(Mt=Ti,V,Zr,Hf).有实用价值的助催化剂只有烷基铝或烷基氯化铝.对丙烯聚合非载体钛系催化剂而言,AlEt_2Cl是较好的助催化剂,而对载体型MgCl_2/TiCl_4钛系催化剂,较好的助催化剂则是AlEt_3.如果将MgBu_2与AlEt_2Cl的混合物用 There are many kinds of olefin polymerization catalysts, and different metal ions or ligands can be obtained to obtain different olefin polymerization catalysts. Alkyl aluminum, aluminum alkyl chloride, alumoxane and Cp_2MtMe compounds (Mt = Ti , V, Zr, Hf) .Although the cocatalysts with practical value are only aluminum alkyls or aluminum alkyls, AlEt_2Cl is a good promoter for propylene polymerization unsupported titanium catalysts, whereas for supported MgCl_2 / TiCl_4 titanium catalyst, a better promoter is AlEt_3. If the mixture of MgBu_2 and AlEt_2Cl with