Catalyst component, catalyst and preparation method thereof for ethylene polymerization

Abstract

The invention provides a catalyst component for ethylene polymerization, which comprises reactants of the following components: (1) magnesium complex; (2) organic alcohol compound; (3) electron donor compound A; (4) Electron donor compound B; (5) electron donor compound C; (6) titanium-containing compound; (7) organoaluminum compound; electron donor compound A is aromatic ester compound; electron donor compound B is malonate Compound; electron donor Compound C is an organosilicon compound without active hydrogen. The catalyst component has the advantages of controllable particles, narrow particle size distribution, high catalytic activity, and good hydrogen modulation sensitivity, and is suitable for the slurry polymerization process of ethylene and the combined polymerization process that requires a high hydrogen modulation sensitivity catalyst. .

Description

technical field [0001] The present invention relates to a catalyst for olefin polymerization, in particular to a catalyst component for ethylene polymerization, a catalyst and a preparation method of the catalyst. Background technique [0002] It is well known that the catalyst system containing Ti / Mg composites plays a dominant role in the industrial production of polyolefins, and the core of its research focuses on the polymerization activity of the catalyst, the particle shape and particle size distribution of the catalyst, and the hydrogen adjustment sensitivity and copolymerization of the catalyst. performance and other related fields. In the prior art, in order to obtain a catalyst with a uniform particle diameter and a good particle shape, people generally adopt the following two types of methods to prepare the catalyst. The first is to dissolve magnesium compounds such as magnesium chloride in certain solvents to obtain a uniform solution, and then mix the solution ...

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Problems solved by technology

Patent CN102295717A on this basis, after adding aromatic ester compounds, the catalyst is easy to precipitate and precipitate, which improves the hydrogen adjustment sensitivity of the catalyst, but its particles are not easy to grow, which is not conducive to the popularization and use of the catalyst in different devices

Patent US20120157296 mentions a catalyst component, adding a diethyl malonate electron donor with a substituent group can improve the selectivity of the catalyst and the hydrogenation sensitivity of the polymerization process, but the catalyst is only suitable for propylene polymerization

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