Catalyst component and catalyst for olefin polymerization, applications of catalyst component and catalyst, and olefin polymerization method

Abstract

The invention belongs to the field of catalysts, and relates to a catalyst component and a catalyst for olefin polymerization, applications of the catalyst component and the catalyst, and an olefin polymerization method. The catalyst component contains a product obtained by a reaction of a magnesium source, a titanium source and an internal electron donor, wherein the internal electron donor is monocarboxylic ester and a diether compound, and relative to each mole of the diether compound, the dosage of the monocarboxylic ester compound is 0.06-0.68 mole. The olefin polymerization catalyst component provided by the invention is prepared by compounding a diether compound and monocarboxylic ester according to a specific ratio as an internal electron donor, and has high stereospecificity and hydrogen regulation sensitivity when being used for olefin polymerization.

Description

technical field [0001] The invention belongs to the field of catalysts, and more specifically, relates to a catalyst component for olefin polymerization, a catalyst for olefin polymerization containing the catalyst component, the application of the catalyst component and the catalyst, and an olefin polymerization method. Background technique [0002] In plastic processing, melt flow rate is an important index used to measure the fluidity of plastic melt, and it is also an important reference for selecting plastic processing materials and grades. The melt flow rate depends largely on the molecular weight of the polymer, with low molecular weight polymers having a high melt flow rate. In order to obtain an olefin polymer with a high melt flow rate, it is generally necessary to add a large amount of hydrogen during polymerization, thereby reducing the molecular weight of the polymer. However, the upper limit of the amount of hydrogen that can be added is limited by the pressu...

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Problems solved by technology

However, the hydrogen adjustment sensitivity of this type of catalyst is insufficient, and it is difficult to produce high melt index products by direct hydrogen adjustment method

Moreover, according to research, it has been found that phthalates (plasticizers) can cause serious damage to the growth and development of animals and the reproductive system, and at the same time, they may also have similar effects on humans.

[0004] CN1580034A, CN1580035A, CN1580033A, CN1436766A and CN1552740A disclose the use of glycol ester compounds as electron donors for propylene polymerization Ziegler-Natta catalysts, which are characterized in that the molecular weight distribution is wider and the polymerization activity is higher, but when containing carboxylic acid When the spherical catalyst of the electron donor in the glycol ester is used for the polymerization of propylene, the stereospecificity is poor, and the isotacticity of the obtained polypropylene is low.

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