Solid catalyst component used for olefin polymerization, and catalyst and application thereof

Abstract

The invention provides a solid catalyst component used for olefin polymerization. The solid catalyst component includes Mg, Ti, halogen and at least two electron donor; one electron donor is 2-substituted amino-phenyl ester compound A selected from a general formula (I), and the other electron donor is selected from a Lewis alkali compound B containing one or more electronegative groups. A catalyst containing the solid catalyst component and an application of the catalyst in olefin polymerization, especially in propylene polymerization, are also disclosed. The catalyst has high activity; highisotacticity and wide molecular weight distribution polypropylene can be obtained; high isotacticity polypropylene can also be obtained without external electron donors; high activity can still be maintained when Al / Ti and Al / Si are reduced or polymerization time is prolonged during polymerization; and the solid catalyst component is suitable for manufacturing low ash polymers.

Description

technical field [0001] The present invention relates to a method for CH 2 = CHR solid catalyst component for olefin polymerization, wherein R is hydrogen or a hydrocarbyl group containing 1 to 12 carbon atoms, more particularly the invention relates to compounds containing at least one 2-substituted amino-phenyl ester and a Lewis base The solid catalyst component of the compound, the catalyst containing the solid catalyst component and the application of the catalyst in the polymerization of olefins, especially in the polymerization of propylene. Background technique [0002] In the propylene polymerization industry, the most widely studied and applied catalyst is the Ziegler-Natta catalyst, which is prepared by adding an internal electron donor during the process of loading titanium on an active magnesium chloride carrier. Since internal electron donors can change the performance of catalysts to the greatest extent, the research and search for ideal internal electron donor...

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Problems solved by technology

[0003] However, in practical applications, the above-mentioned compounds have certain problems as internal electron donors of catalysts for olefin polymerization. For example, the activity of catalysts using dibasic aromatic carboxylic acid ester compounds as internal electron donors is not high, and the prepared polypropylene (PP ) has a narrow relative molecular mass distribution, and phthalates, as commonly used plasticizers, are very harmful to human reproductive health and the environment; 1,3-diether compounds are used as internal donating electrons Although the activity of the catalyst is relatively high, and the hydrogenation sensitivity of the catalyst is also good, the relative molecular mass distribution of the prepared PP is narrow, which is not conducive to the development of different grades of PP; succinate compounds as internal electron donors have the advantage of The relative molecular mass distribution of PP is relatively wide, but the disadvantage is that the stereoregularity of PP and the hydrogen adjustment sensitivity of the catalyst need to be improved; while the overall activity of the diol ester catalytic system is not as ideal as that of the diether system

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