Catalyst component, preparation method and catalyst for olefin polymerization

Abstract

The invention discloses a catalyst component for olefin polymerization, which comprises Mg, Ti, halogen and an electron donor compound, wherein: the electron donor compound includes at least one compound selected from the general formula (I) The first electron donor compound of ester ether compound. The invention also discloses a preparation method of the catalyst component and a catalyst for olefin polymerization containing the catalyst component. The invention adopts the diacid ether compound as the catalyst of the internal electron donor, has excellent activity and good stereospecificity, and the molecular weight distribution of the obtained polymer is relatively wide. Moreover, the catalyst also has high hydrogen adjustment sensitivity, which can be adjusted by adjusting the hydrogen partial pressure [p(H 2 )] to adjust the relative molecular mass of polyolefins to achieve the purpose of controlling their melt flow rate, and the "hydrogen adjustment method" can be used to directly prepare polyolefins with high melt flow rates.

Description

technical field [0001] The present invention relates to a method for CH 2 =CHR Catalyst component for olefin polymerization, more particularly, the present invention relates to a solid catalyst component containing at least one specific type of diacid ether compound. In addition, the present invention also relates to a catalyst containing the solid catalyst component and the application of the catalyst in olefin polymerization. Background technique [0002] In the propylene polymerization industry, the most widely studied and applied catalyst is the Ziegler-Nata catalyst, which is prepared by adding an internal electron donor during the process of loading titanium on an active magnesium chloride carrier. Since the internal electron donor can change the catalyst performance to the greatest extent, the research and search for the ideal internal electron donor compound has become the focus and hotspot of Ziegler-Nata catalyst research. At present, research on internal electro...

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Problems solved by technology

[0003] However, in practical applications, there are certain problems in the above-mentioned compounds as internal electron donors of catalysts for olefin polymerization. The relative molecular mass distribution of polypropylene is relatively narrow, and phthalate compounds are commonly used as plasticizers, which are very harmful to human reproductive health and the environment; 1,3-diether compounds are used as internal plasticizers. Although the electron donor catalyst has high activity and good hydrogen modulation sensitivity, the relative molecular weight distribution of the prepared PP is narrow, which is not conducive to the development of different brands of PP; succinate compounds are used as internal electron donors. The advantage is that the relative molecular mass distribution of the synthesized PP is relatively wide. The disadvantage is that the stereoregularity of PP and the hydrogenation sensitivity of the catalyst need to be improved, and the overall activity of the diol lipid catalytic system is not as ideal as that of the diether system.

[0005] 1,3-diether compounds need to be prepared through a two-step reaction, the production process is longer, and the production yield of succinate compounds is low, while the main raw materials of diol ester compounds such as 2,4-pentanediol are difficult The preparation leads to higher prices, so the production costs of the above-mentioned electron donor compounds are all higher, which is not conducive to the marketing of products

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