Catalyst for propene polymerization

Abstract

The invention provides a catalyst for propene polymerization, which comprises the following components: A, a titanium-containing solid catalyst component, B, an alkylaluminium compound, and C, an organosilicone compound; and the invention also provides a method for preparing the titanium-containing solid catalyst component A. The titanium-containing solid catalyst component comprises titanium, magnesium, halogen, a surface modifier and a polyol ester compound with a special structure, or the polyol ester compound with the special structure which is taken as an electron doner and an electron doner compound with another structure are reasonably compatible with each other and are used in a catalyst system which is modified by the surface modifier to prepare a catalyst component and a catalystwith better comprehensive performance. Particularly, the catalyst provided by the invention shows high polymerization activity and stereospecificity when used for olefin polymerization, in particularthe propene polymerization; and simultaneously, the prepared polymer has wide molecular weight distribution and more facilitates the processing and application.

Description

technical field [0001] The invention relates to a catalyst for olefin polymerization, in particular to a catalyst for propylene polymerization and a method for preparing the solid component of the titanium-containing catalyst. Background technique [0002] Catalysts comprising titanium compounds and electron donor compounds supported on active magnesium halides are well known in the art. [0003] US Patent No. 4,544,717 discloses that the stereospecificity of a catalyst can be improved by adding an electron donor compound to a solid component containing a titanium compound. So far, many patents have disclosed a variety of internal electron donor compounds suitable for the preparation of Ziegler-Natta catalysts, and olefin polymerization catalysts containing these internal electron donor compounds. [0004] These internal electron donor compounds include: electron donor compounds of phthalates described in EP0045977, 1,3-diether compounds described in EP0361493 and EP0728724...

AI Technical Summary

Problems solved by technology

All have described in CN1436796A, CN1453298A the catalyst component and the catalyst that are used for the polymerization of olefins that this special polyester compound (A) obtains as internal electron donor, and point out that compound (A) can be with other electron donor The compound is used in combination to prepare the catalyst, but from the results of the examples given in the patent, the performance of the catalyst obtained by using the compound (A) in combination with another electron donor is not very ideal, especially the polymerization of the catalyst The activity and hydrogen adjustment performance are not very satisfactory

[0006] CN1718594A discloses a catalyst system for olefin polymerization, by dissolving magnesium halides in organic epoxy compounds, organic phosphorus compounds and inert diluents to form a homogeneous solution, using titanium halides or their Derivatives are precipitated with magnesium / titanium-containing solids, and on the titanium / magnesium solids, at least one surface modifier, at least one transition metal titanium halide or its derivatives, and at least one obtained from electron donors; the particle shape, stereospecificity and impurity resistance of this catalyst are better, but the molecular weight distribution of the catalyst is not very satisfactory

Images