Component and preparation method of spherical alkoxy magnesium particles

Abstract

The invention discloses a component and a preparation method of a spherical alkoxy magnesium particle. A certain amount of a hydroxymethyl cellulose or hydroxypropyl cellulose substance is introducedto an alcohol or mixed alcohol compound, and contacts and reacts with metallic magnesium powder to prepare alkoxy magnesium; and the obtained alkoxy magnesium particle has the advantages of complete form, high sphericility, high bulk density, uniformity and narrow particle size distribution. The alkoxy magnesium particle can be used for preparing an olefin polymerization catalyst.

Description

technical field [0001] The invention relates to the field of preparation of alkoxymagnesium, in particular to a component of spherical alkoxymagnesium particles and a method for preparing spherical alkoxymagnesium particles using the component. Background technique [0002] As we all know, with the development of the economy, people's demand for polyolefin materials is getting higher and higher. High-efficiency polyolefin catalysts for the production of polyolefin materials have gained great popularity in the field of polyolefin catalysts due to their well-controlled particle morphology and microstructure. Wide range of applications. The composition and microstructure of the carrier play a key role, and the carriers obtained by different methods correspond to the catalysts with different structures and properties. [0003] In many patent documents, it is disclosed that alkoxymagnesium is used as the carrier of high-performance catalysts, and the catalysts prepared by alkoxy...

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Problems solved by technology

In recent years, there are various methods for preparing alkoxymagnesium in published technical literature reports, mainly containing the following categories: a kind of method disclosed in Japanese Patent Laying-Open 03-74341, 04-368391 in the presence of iodine, metal Magnesium reacts with alcohol to obtain spherical or ellipsoidal diethoxymagnesium. However, this method is difficult to control a suitable reaction rate, and the resulting product will inevitably produce uneven large particles or fine powders, and the general bulk density is relatively high. Low; the other is the spray-drying process of the diethoxymagnesium alcohol solution disclosed in Patent Laying-Open No. 6-8733, which can prepare spherical particles and then carry out decarboxylation treatment. This process is cumbersome and expensive, and the obtained product It is also difficult to completely decarboxylate, and the product quality is difficult to meet the downstream use; in addition, there is another kind of reaction of metal magnesium and alcohol to obtain alkoxymagnesium, and then mechanically grind to control the particle size. The problem of this method is also the obtained product Particle size is uneven, which seriously affects the use

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