Olefins polymerizing solid catalyst component, producing method and application of the same

Abstract

An olefin polymerized solid catalyst component contains a titanium compound loaded on the magnesium compound and the inner electron donor. The inner electron donor comprises phthalate dialkyl ester phthalate ester and ether compounds chosen from the formula (I) or (II); the weight ratio between ether and ester is from 0.1 : 3.0 to 1. In the formula (I) or (II), R1 is chosen from alkyl of C1 to C12, naphthene group of C3 to C12, aryl of C6 to C20, n-aryl or aryl alkyl; R2 is chosen from hydrogen, alkyl of C1 to C12, naphthene group of C3 to C12, aryl of C6-C20, n-aryl or aryl alkyl;R3 is chosen from hydrogen, alkyl of C1 to C12, naphthene group of C3 to C12, acryl or n-aryl of C6 to C20. The solid catalyst used for olefin polymerization has high activity, and the distribution of molecular weight of the prepared polyolefin is wide.

Description

technical field The invention relates to an olefin polymerization solid catalyst component, its preparation method and application, specifically, a solid catalyst component containing an internal electron donor compound, its preparation method and its application in olefin polymerization. Background technique CH 2 =CHR The solid catalyst component used in the polymerization of olefins, especially α-olefins having 3 or more carbon atoms, contains the essential components of magnesium, titanium, halogen and an electron donor compound, wherein the electron donor compound It is mostly called an internal electron donor and is mainly used to improve the stereoregularity of polymers. The internal electron donor compounds used in the prior art include polycarboxylic acids, monocarboxylic esters, polycarboxylic acid esters, acid anhydrides, ketones, ethers, alcohols or amines, among which polycarboxylic acid esters are commonly used. In recent years, people try to adopt other comp...

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Problems solved by technology

The olefin polymerization catalyst prepared by the internal electron donor compound disclosed by the above method still has certain problems in practical application, such as the activity of the catalyst that adopts a dibasic aromatic carboxylic acid ester compound as the internal electron donor is low, and the obtained polymerization The molecular weight distribution of the compound is also narrow; the catalyst activity of the dibasic aliphatic carboxylic acid ester compound is also low; although the catalyst of the 1,3-diether compound is highly active and the hydrogen adjustment sensitivity is also good, but The molecular weight distribution of the obtained polymer is narrow, which is not conducive to the development of different grades of polymer products

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