Method for preparing solid catalyst component for olefin polymerization and catalyst for olefin polymerization

Abstract

The invention discloses a method for preparing a solid catalyst component for an olefin polymerization reaction. The method comprises the following steps of dissolving a magnesium compound in a solvent system containing a hydrocarbon compound and an alcohol compound, mixing a titanium compound and the above solution at a temperature of -40 to 0 DEG C, adding an electron donor compound into the mixture at a temperature of 50-150 DEG C, and carrying out washing by an inert diluent to obtain the solid catalyst component. The used electron donor is at least one of diol ester compounds shown in the general formula (I). The catalyst system 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 variety of electron donor compounds have been disclosed in large quantities, such as polycarboxylic acids,...

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Problems solved by technology

[0003] At present, there is a document disclosing a glycol ester compound. By using this glycol ester compound as an electron donor in an olefin polymerization catalyst, a catalyst with excellent comprehensive performance can be obtained. When used for propylene polymerization, it has a higher Polymerization activity and stereospecificity, the molecular weight distribution of the obtained polymer is also broad, but the catalyst activity, hydrogen sensitivity and stereospecificity are not satisfactory, especially when producing high melt index polymers under high hydrogen concentration , the isotactic index of the obtained polymer is not high enough and needs to be further improved

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