Solid catalyst component for preparing olefin polymer

Abstract

The invention provides a solid catalyst component for an olefin polymerization reaction. The solid catalyst component comprises magnesium, titanium, halogen and an electron donor. The electron donor is at least one of diol ester compounds shown in the general formula (I). The catalyst provided by the invention has greatly improved polymerization activity, hydrogen response and stereospecificity. Through the solid catalyst component and the catalyst, a polymer having a high fusion index and high isotacticity is obtained. Compared with the prior art, the solid catalyst component has the advantages that if polymer melt indexes are the same, in other words, hydrogen response is the same, isotactic indexes are improved, and if polymer isotactic indexes are the same, the polymer melt indexes are improved, in other words, the hydrogen response is improved.

Description

technical field [0001] The invention relates to a solid catalyst component, in particular to a solid catalyst component for preparing high-melting index high isotactic olefin polymers. The invention also relates to a catalyst system containing the solid catalyst component and the application of the catalyst system in olefin polymerization. Background technique [0002] It is well known that solid titanium catalyst components based on magnesium, titanium, halogen and electron donors can be used in olefin polymerization, especially in the polymerization of α-olefins with 3 or more carbon atoms. Polymers with higher yield and higher stereoregularity, in which the electron donor compound is one of the essential components in the catalyst component, and with the development of the internal electron donor compound, the polyolefin catalyst is constantly updated. Currently , A large number of electron donor compounds have been disclosed, such as polycarboxylic acid, monocarboxylic ...

AI Technical Summary

Problems solved by technology

When the catalyst is used for propylene polymerization, it has higher polymerization activity and stereospecificity, and the molecular weight distribution of the obtained polymer is also wider, but the activity of the catalyst, hydrogenation sensitivity and stereospecificity are not satisfactory. Especially when high melt index polymers are produced under high hydrogen concentration, the isotactic index of the obtained polymers is not high enough and needs to be further improved

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