Catalyst component used for propene polymerization and catalyst

Abstract

The invention provides a catalyst used for olefin polymerization, particularly propene polymerization. A titanium-containing catalyst component A selects a polyol ester compound with a special structure as an auxiliary precipitator, simultaneously a polyol ester compound or a binary aromatic carboxylate compound taken as an electron doner is matched for application, the conventionally used auxiliary precipitator, namely a compound phthalic anhydride is saved, a reaction step of dissolving the auxiliary precipitator is saved, and the complexity of synthesizing the catalyst component is reduced,so that the catalyst preparing process is more easily controlled, the prepared catalyst shows exciting polymerization activity and stereospecificity when used for the propene polymerization, and thepolymer has less fine powder content and wide molecular weight distribution.

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] As we all know, the granular catalyst with magnesium, titanium, halogen and electron donor as the basic components is firstly prepared into a uniform solution of magnesium chloride, and then precipitated by crystallization and loaded with titanium-containing active components. In the dissolution and elution system, only the presence of a precipitation aid can obtain solids with uniform particle size. The precipitation aid generally uses compounds such as organic acid anhydrides, organic acids, ketones, ethers, etc., as disclosed in patents such as CN85100997A and CN 1453298A The precipitation aid is an organic acid anhydride. Wherein the titanium-containing catalyst component is a homogeneous solution formed by dissolving...

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Problems solved by technology

In the preparation method of the titanium-containing catalyst component disclosed in CN1931885A, a solid catalyst can be obtained without adding a precipitation aid. The patent only lists the activity of the catalyst for propylene polymerization in one example, and other properties have not been studied in depth

[0005] Chinese patent CN1718594A discloses a catalyst system for olefin polymerization or copolymerization, by further loading at least one surface modifier on the titanium / magnesium solid, thereby obtaining a titanium-containing solid catalyst component, this The particle shape, stereospecificity and impurity resistance of the catalyst are good, but the molecular weight distribution of the catalyst is not very satisfactory

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