Catalyst component for ethylene polymerization and catalyst

Abstract

The invention discloses a catalyst component for ethylene polymerization, which is prepared by dissolving magnesium halide in an organic epoxy compound and an organic phosphorous compound to form uniform solution, adding a halohydrin compound and an alcohol, and reacting with a titanium compound in the presence of an active hydrogen-free organic silicon compound auxiliary precipitator. In the invention, because of the use of the active hydrogen-free organic silicon compound as the auxiliary precipitator and the inter-molecular construction function of halohydrin, the catalyst particles can precipitate easily in the preparation process of the catalyst component without using a large amount of titanium tetrachloride to promote the precipitation of the precipitate nor using titanium tetrachloride to treat the precipitate for many times, so the consumption of titanium tetrachloride is reduced greatly. Meanwhile, the addition of the organic silicon compound helps to improve the activity and particle form of the catalyst, and when used for ethylene polymerization, the catalyst shows high polymerization activity and high hydrogen adjustment sensitivity.

Description

technical field [0001] The invention relates to a catalyst component for ethylene polymerization, a preparation method, a catalyst composed of the catalyst component and its application in olefin polymerization, belonging to the field of olefin polymerization. technical background [0002] It is well known that the catalyst system containing Ti / Mg composites plays a dominant role in the industrial production of polyethylene, and its research focuses on the polymerization activity of the catalyst, the hydrogenation sensitivity and copolymerization performance of the catalyst, the particle shape and particle size distribution of the catalyst Wait. With the development of catalyst preparation technology, in order to obtain catalysts with uniform particles and better particle morphology, researchers tend to use the method of dissolution and crystallization to prepare catalysts. The morphology of catalyst particles can be better controlled by changing physical methods (such as d...

AI Technical Summary

Problems solved by technology

Therefore, not only the presence of acid anhydride has an adverse effect on the catalyst, but also the use of a large amount of titanium tetrachloride will cause a lot of waste and pollution

At the same time, this kind of system is also easy to stick, and the catalyst is difficult to prepare

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