Catalyst for ethylene polymerization or copolymerization and its prepn and application

Abstract

The present invention provides catalyst component for ethylene polymerization or copolymerization and its preparation process. The catalyst is homogeneous solution prepared through dissolving magnesium halide in organic epoxy compound or organic phosphorus compound and adding electron donor compound. The present invention has separation assistant of non-toxic inorganic carbon containing solid to result in high catalytic performance, and the separation assistant is not soluble and swollen, needs no dissolving step, and may be used as the nucleartor for catalyst microcrystal growth to control the shape of catalyst. The present invention is superior to available technology, which has long temperature raising time, long catalyst preparing period, hard production operation and other demerits.

Description

technical field [0001] The present invention relates to a catalyst component for ethylene polymerization or copolymerization, its preparation method, and its application in olefin polymerization or copolymerization. Background technique [0002] In the late 1970s, companies such as Mitsui Petrochemical Corporation of Japan and Monai of the United States successfully developed titanium-magnesium high-efficiency carrier catalysts with magnesium chloride as the carrier. Because the carrier was used to improve the utilization rate of the active center of the titanium atom, the catalytic activity was improved. It is much higher than conventional catalysts and simplifies the polymerization process, so the world's polyolefin industry has developed rapidly. Conventional methods for preparing highly active supported catalysts are generally co-grinding, grinding and impregnating, spraying carrier forming and high-speed stirring carrier forming, etc. The main disadvantage of the catal...

AI Technical Summary

Problems solved by technology

[0005] Compounds such as organic acid anhydrides, organic acids, ethers, ketones have all been used in the catalyst systems disclosed by CN85100997 and CN1229092 as the precipitation aids. and heating rate, especially when catalyst solid nuclei are formed, the control of heating rate is more necessary, and generally requires a longer heating time, so the use of this kind of precipitation aid prolongs the preparation period of catalyst accordingly It is more difficult, and the precipitation aids used are generally phthalic anhydride compounds, which are also toxic to the body, etc.