Preparation method of catalyst component for olefin polymerization

Abstract

The invention relates to a preparation method of a catalyst component for olefin polymerization. In preparation of the catalyst component, a compound shown in the general formula (I) and an organic acid anhydride compound are used together as a precipitation aid so that a certain synergistic effect is obtained. The prepared catalyst has good fluidity, good particle morphology, uniform particle size distribution and excellent integrated performances. In a propylene polymerization reaction, the catalyst has high activity, a good orientation capacity and high isotacticity and is conducive to industrial application.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a preparation method of a catalyst component for olefin polymerization. Background technique [0002] The preparation of the magnesium chloride supported catalyst usually first activates the magnesium chloride by chemical method, and then treats the highly active magnesium chloride with a titanium compound. Chemical activation of magnesium chloride generally dissolves magnesium chloride in the solvent system first, and then removes the solvent by heat treatment or adds a precipitation agent to re-precipitate magnesium chloride from the solution. And when using techniques such as adding a precipitation agent to make magnesium chloride re-precipitate from the solution, it is often necessary to add a precipitation aid to obtain a solid with uniform particle size. [0003] It has been shown in the prior art that phthalic anhydride is a preferred example as an eluting a...

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Problems solved by technology

[0003] The prior art shows that the use of phthalic anhydride as a co-elution agent is a preferred example, but the catalyst activity thus prepared is not high

In order to improve the activity of the catalyst, it is reported that malonate is used as a precipitation aid, but this type of catalyst reduces the orientation ability of the catalyst while improving the activity of the catalyst, which limits the industrial application of the catalyst.

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