Catalyst for ethylene polymerization and components thereof

Abstract

The invention relates to a catalyst component that is used in ethane homopolymerization or copolymerization of ethane with other alpha-alkene and a preparation method thereof, wherein, the catalyst component comprises a magnesium complex substance, at least a titanium compound, at least an organic alcoholic compound with carbon atom number more than 5 and at least a reaction product of an organicsilicon compound; the magnesium complex substance is prepared by dissolving a magnesium compound in a system of organic epoxy compounds and organic phosphorous compounds. The catalyst of the inventionhas the advantages of relatively high catalytic activity, relatively good hydrogen modulation sensibility, polymer with narrow particle diameter distribution, polymer with high stacking density, etc., and is extremely applicable to slurry polymerization technique of ethane.

Description

technical field

[0001] The present invention relates to a catalyst component for ethylene polymerization or copolymerization, a method for preparing the catalyst component and a catalyst for the catalyst component. technical background

[0002] As we all know, the catalyst system containing Ti / Mg composite plays a dominant role in the industrial production of polyethylene, and the core of its research is nothing more than the polymerization activity of the catalyst, the particle shape and particle size distribution of the catalyst, the hydrogen adjustment sensitivity and Copolymerization performance and so on. In the slurry polymerization process of ethylene, in addition to requiring the catalyst to have high catalytic activity, it is very important to control the particle size and particle size distribution of the produced ethylene polymer. In the process of ethylene polymerization, especially the slurry polymerization of ethylene, it is easy to produce finer polymer parti...

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