Solid catalyst for preparing olefin polymer and solid catalyst system

Abstract

The invention provides a solid catalyst for preparing an olefin polymer, the solid catalyst comprises the following components or reaction products of the following components: magnesium element, titanium element, halogen, a first internal electron donor and a second internal electron donor, the first internal electron donor comprises a pillararene compound as shown in formula (I), and the second internal electron donor is selected from one or more of an alcohol ester compound, an aromatic carboxylic ester compound, a diether compound and a succinate compound. By introducing the pillararene compound as shown in the formula (I) or the derivative thereof as an internal electron donor into the solid catalyst component, the stereospecificity of the catalyst can be improved, and the molecular weight of a polymerization product can be improved.

Description

technical field [0001] The invention relates to the field of olefin polymerization, in particular to a solid catalyst and a solid catalyst system for preparing olefin polymers. Background technique [0002] As we all know, when the solid titanium-based catalyst component based on magnesium, titanium, halogen and internal electron donor compound is used for olefin polymerization, the internal electron donor compound has a great influence on important indicators such as polymerization activity, polymer isotactic index, molecular weight, etc. Playing a decisive role, the development of internal electron donor compounds has extraordinary significance for the replacement of catalysts. [0003] At present, domestic and foreign research on internal electron donors mainly focuses on fatty acid esters and aromatic ester compounds (such as patent CN85100997A and its derivative patents); diethers and diketones (such as patents CN1042547A and CN1054139A); succinic acid Esters (such as ...

AI Technical Summary

Problems solved by technology

For example, the catalytic activity of catalysts using dibasic aromatic carboxylic acid ester compounds is low, and the molecular weight distribution of the resulting polymer is relatively narrow; although the catalysts using 1,3-diether compounds have high activity and good hydrogen adjustment sensitivity, but The molecular weight distribution of the obtained polymer is narrow, which is not conducive to the development of different grades of polymers; the advantage of using succinate compounds as internal electron donors is that the molecular weight distribution of the synthesized polypropylene is wide, and the disadvantage lies in the stereospecification of the polymer sex needs to be improved

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