Catalyst component and catalyst for olefin polymerization

Abstract

The invention relates to a catalyst component and a catalyst for olefin polymerization, and application thereof in olefin homopolymerization and copolymerization. Alpha-cyanosuccinic acid ester compounds with a special structure or a composite donor system consisting of the alpha-cyanosuccinic acid ester compounds is used as an internal donor to synthesize the catalyst, the catalyst has higher catalytic activity during propylene polymerization, a polymerization product has high isotacticity and wide molecular weight distribution. The alpha-cyanosuccinic acid ester compounds are easier to prepare and more suitable for industrial production compared with the conventional 2,3-dialkyl succinic acid ester compounds.

Description

technical field [0001] The present invention relates to a catalyst component and catalyst for olefin polymerization, and its application in olefin homopolymerization and copolymerization. More specifically, it relates to a solid catalyst component containing a compound of general formula (I) as an internal electron donor, and the application of the catalyst containing this component in olefin polymerization. Background technique [0002] In this field, it is well known that Ziegler-Natta catalyst consists of at least two parts: the active component containing transition metal, also known as the main catalyst, the more transition metal compounds used in practice are titanium and vanadium, generally with carrier magnesium chloride Together to form a solid catalyst component; and a metal organic compound containing elements of Group I A to IIIA of the periodic system, also known as a co-catalyst, mainly an alkyl aluminum or an alkyl aluminum halide. In some cases, especially w...

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Problems solved by technology

In industrial applications, these internal electron donors have certain defects in practical applications: for example, the catalytic activity of catalysts using aromatic diester compounds is lower than that of diether compounds; catalysts using diether compounds Although the catalytic activity is high and has good hydrogen tuning sensitivity, the relative molecular mass distribution of the resulting polymer is narrow; although the succinate ester compound of 2,3-dihydrocarbyl has a wide relative molecular mass distribution, there is this inner molecular mass distribution. Difficulties in industrial application of electron donor compound synthesis process; Patent CN1242780A uses C with ω-cyano group 2 ~C 5 Monobasic acid ester compounds are catalysts for internal electron donors, and there are also ω-cyano C 3 ~C 5 Difficulties in the synthesis of monobasic acid ester compounds, although C containing ω-cyano 2 Monobasic acid ester compounds (that is: cyanoacetate compounds containing substituents) are easier to synthesize, but compared with the catalysts of aromatic diester compounds, the C of ω-cyano 2 ~C 5 Monobasic acid ester compounds are less active catalysts for internal electron donors, and the resulting polymer is also poor in isotacticity, etc.

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