Catalyst for ethylene polymerization or copolymerization and its preparation and application

Abstract

The invention provides a catalyst component for ethylene polymerization or copolymerization and a preparation method thereof. Wherein the catalyst is formed by dissolving magnesium halide in organic epoxy compound, organic phosphorus compound and adding electron donor compound to form a homogeneous solution. The present invention uses a non-toxic inorganic carbon-containing solid precipitation aid to make the catalyst suitable for ethylene polymerization or co-precipitation. Polymerization has comparable or better catalytic performance than the above-mentioned catalytic system. Since it is neither dissolved nor swelled, the dissolution reaction step of the precipitation aid is omitted. At the same time, this type of solid substance can also be used as a catalyst for microcrystal growth in the system. Therefore, the particle shape of the final catalyst can also be adjusted by selecting and controlling the particles of this type of solid material, which increases the means of regulating the particle shape of the catalyst and overcomes the long heating time and long catalyst preparation cycle of the existing technology , production operations are more difficult and other disadvantages, and to a certain extent reduce pollution.

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...

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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.