2-cycloalkyl-3-secondary alkyl-2-cyansuccinate compounds, preparation method thereof and application thereof

Abstract

The invention relates to 2-cycloalkyl-3-secondary alkyl-2-cyansuccinate compounds with a general formula represented by formula (II) and a preparation method thereof. A catalyst which is synthesized by treating the compounds as an internal electron donor of a titanium-contained solid catalyst component of an olefin polymerization catalyst has excellent performances and has a high activity on the propylene polymerization, the isotacticity degree of obtained polymers is good, and the molecular weight distribution of the obtained polymers is wide. Comprehensive performances of the catalyst in the invention are better than comprehensive performances of catalysts which treat 2,3-dialkylsuccinate compounds or omega-cyan C2-C5 monobasic ester compounds as the internal electron donor and have been reported by literatures.

Description

technical field [0001] The invention relates to an internal electron donor compound used for preparing a solid catalyst component for olefin polymerization, a preparation method thereof, and the application of the catalyst component in olefin homopolymerization and copolymerization. It belongs to the field of organic synthesis and 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 IA 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 when it is used for propylene polymerization catalysis, a ...

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Problems solved by technology

In industrial production, each of these internal electron donors has certain defects in practical applications: the catalytic activity of catalysts using aromatic diester compounds is lower than that of diether compounds; Although the catalyst has high catalytic activity and good hydrogen modulation sensitivity, the relative molecular mass distribution of the obtained polymer is narrow; although the relative molecular mass distribution of the 2,3-dihydrocarbyl succinate ester compound is wide, the presence of this Problems such as difficulties in the industrial application of the internal electron donor compound synthesis process; the C of the ω-cyano group used in the patent CN1242780A 2 ~C 5 Catalyst for monobasic acid ester compounds, there is also C of ω-cyano group 3 ~C 5 Difficulty in the synthesis of monobasic acid ester compounds. Although the synthesis of cyanoacetate compounds containing substituents is relatively easy, 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

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