Catalyst, preparation method and application for olefin polymerization or copolymerization

Abstract

This invention relates to a catalyst system which is used for alkenes polymerizing or copolymerization, it includes solid catalyst composition A that contains titanium and organic Aluminum compound B, silicoorganic compound C, in the composing process of catalyst composition A, use aldyl ester of aryl group mon-carboxylic acid and aldyl ester of fatty series or multielement carboxylic acid of aryl group for reasonable combination, among them aldyl ester of aryl group mon-carboxylic can play a role of assisting separating agent, it is useful to separate catalyst particle; Meanwhile it is used as electron donor, it also can load on the surface of catalytic agent together with compound of multielement carboxylic esters, improve the surface structure of catalytic agent, thus improve the catalyzing function of catalytic agent. This catalytic agent that is used for propylene polymerizing has high catalytic activity and anti- impurity function, particle appearance of catalytic agent is good, particles distribute narrowly, hydro-adjusting function of catalytic agent is good, it is useful for many polymerizing technology such as seriflux method, noumenon method and gas method, molecular weight distribution of polymer is narrow, particle appearance of polymer is good, fine grits is little; Its fine anti-impurity function can effectively reduce production cost.

Description

technical field [0001] The present invention relates to a catalyst component for olefin polymerization or copolymerization, its preparation method, and its application in olefin polymerization or copolymerization. Background technique [0002] Solid titanium catalyst components based on magnesium, titanium, halogen and electron donors for CH 2 = CHR olefin polymerization, especially in the polymerization of alpha olefins with 3 or more carbon atoms, polymers with higher yield and higher stereoregularity can be obtained, wherein the electron donor compound is an essential component of the catalyst One of the indispensable ingredients, and with the development of internal electron donor compounds, polyolefin catalysts are constantly updated. At present, a large number of electron donor compounds have been disclosed, such as polycarboxylic acid, monobasic or polycarboxylic acid ester, acid anhydride, ketone, monoether or polyether, alcohol, amine, etc. and their derivatives, a...

AI Technical Summary

Problems solved by technology

[0006] Chinese patent 2004100622909 discloses a solid catalyst component that uses alcohol and binary aromatic carboxylic acid esters as electron donors. The alcohol used also acts as a surface modifier. The catalyst component not only has higher activity, but the resulting propylene polymerization The particle shape of the product is good, and the fine powder is less, but the molecular weight distribution of the polymer is narrow, which is not conducive to the development of different grades of polymers

[0007] However, catalysts for olefin polymerization prepared using the above-mentioned disclosed dibasic aromatic carboxylic acid ester compounds, 1,3-diether compounds, dibasic aliphatic carboxylic acid ester compounds and glycol ester compounds as electron donors There are certain defects in practical applications, such as the use of dibasic aromatic carboxylic acid ester compounds with low catalyst activity, and the molecular weight distribution of the resulting polymer is narrow; although the catalysts with 1,3-diether compounds have high activity , but the molecular weight distribution of the obtained polymer is narrow, which is not conducive to the development of different grades of polymers; the activity of the catalyst using dibasic aliphatic carboxylate compounds is still low; the hydrogen adjustment performance of the catalyst using diol ester compounds is relatively low Difference