Preparation method of catalyst component for polymerization of vinyl and catalyst for polymerization of vinyl

Abstract

The invention relates to a preparation method of catalyst components for polymerization of vinyl and a catalyst for the polymerization of vinyl. The method comprises the following steps: carrying out proper physical modification on a magnesium compound at a certain temperature; and then directly loading active components such as titanium tetrachloride and the like on the magnesium compound so as to prepare the catalyst suitable for the slurry polymerization and gas phase polymerization of vinyl. The catalyst prepared by the method has good hydrogen-regulating sensitivity in the process of catalyzing the polymerization of vinyl, the catalyst particle is strong and has small possibility of breaking, a particle form is good and is of a sphere shape, and the prepared catalyst has the characteristic of higher catalysis activity; and the preparation method is simple and easy to operate, and has small possibilities of generating serious corrosion on a device, and causing serious influence onenvironment; and the prepared polymer particle is of a sphere shape, and the fine powder is less.

Description

technical field [0001] The invention relates to a preparation method of a catalyst component for ethylene polymerization and a catalyst thereof. Background technique [0002] In the development of olefin polymerization catalysts, Ziegler-Natta catalysts with good particle shape have always been one of the goals pursued by people, especially in the gas phase polyethylene process, which is particularly important because of the good particle shape Ziegler-Natta catalysts form polymers in fine particle form so that they do not clog equipment. [0003] US Patent No. 4,293,673 discloses a catalyst prepared by using a composite carrier of silica gel and magnesium chloride. The catalyst has high activity when used in a gas phase polymerization process, and the prepared ethylene polymer has a good particle shape. However, the preparation process of most of these catalysts is relatively cumbersome, and usually includes the step of reacting an organoaluminum compound with a spray-drie...

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Problems solved by technology

However, the preparation process of most of these catalysts is relatively cumbersome, and usually includes the step of reacting the organoaluminum compound with the spray-dried catalyst precursor

[0004] Chinese patent CN1140722 discloses a catalyst prepared by first dissolving magnesium chloride solid, and then reacting with titanium halide to co-precipitate and precipitate. The catalyst is used in the gas phase polymerization process. The catalyst particles are irregular and the sphericity is relatively poor.

[0005] European patent EP0601524 discloses a catalyst prepared by preforming magnesium chloride to support active components. During the preparation of the catalyst, it needs to be treated with a large amount of titanium tetrachloride at a high temperature of 120°C to 140°C, which is easy to damage the equipment. Severe corrosion occurs, which has a serious impact on the production environment; the catalyst is used in the gas-phase polymerization process, and it is easily broken when the polymerization reaction activity is high, resulting in a large amount of polymer fine powder, which usually requires an increase in the pre-polymerization process; in addition, the catalyst’s Poor sensitivity to hydrogen adjustment, that is, under similar polymerization conditions, the hydrogen partial pressure is similar, but the melt index of the obtained polymer is significantly lower

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