A kind of catalyst component and catalyst for propylene polymerization

Abstract

The invention provides a catalyst for olefin polymerization, especially propylene polymerization. The titanium-containing catalyst component A selects a polyol ester compound with a special structure as a precipitation aid, and simultaneously uses a polyol ester compound or a binary The aromatic carboxylic acid ester compound is used as an electron donor, which saves the use of the traditional elution aid compound phthalic anhydride, eliminates the reaction step of dissolving the aid elution agent, reduces the complexity of catalyst component synthesis, and makes the catalyst preparation process more efficient. It is easy to control, and the obtained catalyst shows exciting polymerization activity and stereospecificity when used in propylene polymerization, and the polymer has less fine powder content and wider 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...

AI Technical Summary

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

Images