Catalyst component and catalyst for olefin polymerization

Abstract

The invention relates to a catalyst component and a catalyst for olefin polymerization and application of the catalyst to olefin homopolymerization and copolymerization. In the invention, an alpha-cyano ester succinate compound containing a specific structure is used as an internal electron donor, a magnesium chloride and silicon dioxide composite carrier is used, and the technical means are matched with each other for use, so that the polymerization activity of the catalyst is also kept while the grain form of the catalyst is improved. The catalyst is used for propylene polymerization; a polymerization product has a high isotactic index and high weight-average molecular weight; and polypropylene with wide molecular weight distribution is obtained. Compared with the conventional 2,3-dialkyl ester succinate compound, the alpha-cyano ester succinate compound has the advantages of high easiness in preparation and high contribution to industrial production.

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. 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, and the transition metal compounds with more practical applications are titanium and vanadium, generally together with carrier magnesium chloride A solid catalyst component is formed; and a metal organic compound containing elements of group 1A to IIIA of the periodic system, also known as a co-catalyst, is mainly an aluminum alkyl or a halide of an aluminum alkyl. In some cases, especially when it is used for propylene polymerization catalysis, a third component is often added to control the isotacticity of the product and improve the polymerization activity. These are usually Lewis base...

AI Technical Summary

Problems solved by technology

In industrial production, each of these internal electron donors has 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. Problems such as difficulties in the industrial application of the 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 obtained polymers are also poor in isotacticity

But 2,3-dialkyl succinates, especially 2,3-diisopropyl succinate compounds, have the difficult problem of its synthetic technology industrial application

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