Catalyst component for olefin polymerization and catalyst

Abstract

The invention relates to a catalyst component for olefin polymerization, a catalyst and application of the catalyst in olefin homopolymerization and polymerization. By using a composite internal electronic donor compound which contains an alpha-cyanosuccinate compound A and a single-functional group or double-functional group compound B which is selected from ester, ether, ketone and ketal exceptfor the compound A as the catalyst of internal electronic donor synthesis, the catalyst has the characteristics of high catalytic activity, high hydrogen adjusting sensitivity, high isotactic index of polymerized products, wide molecular weight distribution and high weight-average molecular weight when being used for propylene polymerization. The favorable performance of the catalyst is beneficial to the preparation of polypropylene and the brand development of products.

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] It is well known in the art that halides, oxyhalides, acetylacetonates, etc. of transition metals and organometallic compounds containing elements of Groups IA to IIIA of the periodic system are the basic constituents of Ziegler-Natta catalysts. The former is often called the main catalyst, and the commonly used transition metal compounds are titanium and vanadium. The latter are often referred to as cocatalysts and are mainly aluminum alkyls or halides of aluminum alkyls. In some cases, especially when it is used in the catalysis of propylene polymerization, an electron donor is often added as the third component to control the isotacticity of the product and improve the polymerization activity. Since U.S. Patent No. 4,544,717 disclosed that by adding an int...

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Problems solved by technology

In industrial applications, these internal electron donors have certain defects in practical applications: the catalytic activity of catalysts using aromatic diester compounds is low, and the relative molecular mass distribution of the obtained polymers is moderate; the Chinese patent The catalyst of the diol ester compound used in CN1453298 is not as sensitive to hydrogen adjustment as the catalyst using diether compounds, and the relative molecular mass distribution of the resulting polymer is generally not as good as using 2,3-dihydrocarbyl succinate compounds. Evaluation results: Although the catalyst using diether compounds has high catalytic activity and good hydrogen modulation sensitivity, the relative molecular mass distribution of the obtained polymer is narrow; The mass distribution is wide, but there are problems such as the difficulty in the synthesis process of internal electron donor compounds in industrial applications; in the patent CN1242780A, C with ω-cyano group is used 2 ~C 5 Monobasic acid ester compounds are catalysts for internal electron donors, and there are also ω-cyano C 3 ~C 5 The synthesis of monobasic acid ester compounds is difficult, although the 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 obtained polymers are also poor in isotacticity

[0011] Chinese patent CN1221573C discloses 2,3-diisopropyl diethyl succinate and diisobutyl phthalate containing racemic isomers as a composite internal electron donor, but using the composite internal electron donor The effect of the catalyzer of electron body is not as good as the catalyzer effect of the internal electron donor of 2,3-diisopropyl diethyl succinate containing racemic isomer alone, and catalyst activity reduces, and molecular weight distribution also reduces ( See Polymerization Example 7 and Comparative Example C5)

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