Process for the preparation of catalyst components for olefin polymerization

Abstract

The invention relates to a preparation method for catalyst components used for olefin polymerization. In the preparation process of the catalyst components, a compound shown in the formula (1) (please see the formula in the specifications) and a organic acid anhydride compound are adopted to serve as an auxiliary separating agent to show a certain synergistic effect. A prepared catalyst is good in mobility and particle morphology. The particle distribution is uniform, and comprehensive performance of the catalyst is excellent. Especially when used for a propylene polymerization reaction, the catalyst is high in activity and good in orientation ability, an obtained polymer is high in isotacticity, and the preparation method is favorable for the industrialized application.

Description

Technical field [0001] The invention belongs to the technical field of catalysts, and specifically 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 chemically activates the magnesium chloride, and then treats the highly active magnesium chloride with a titanium compound. Chemical method to activate magnesium chloride generally first dissolve magnesium chloride in a solvent system, and then use heat treatment to remove the solvent or add a precipitation agent to re-precipitate the magnesium chloride from the solution. When using techniques such as adding a precipitation agent to re-precipitate magnesium chloride from the solution, it is often necessary to add a precipitation aid to obtain a solid with uniform particle size. [0003] The prior art shows that using phthalic anhydride as a precipitation aid is a preferred example, but the catalyst ...

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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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