Catalyst applied to vinyl polymerization and preparation method and application thereof

Abstract

The invention discloses a catalyst applied to vinyl polymerization and a preparation method and an application thereof. The catalyst comprises (A) a solid catalyst component containing titanium and (B) an organic aluminum compound, wherein the solid catalyst component is prepared by dissolving magnesium halide into an organic epoxy compound and organic phosphorous compound, adding an electron donor compound to form a uniform solution, reacting with a halide of transition metallic titanium or a derivative thereof, and adding a mixture of organic ethanol and / or methylbenzene of a tellurium compound for treating; the general formula of the organic aluminum compound is AlRnX3-n; in the formula, R is hydrogen or C1-20 carbon atoms, X is halogen, and n is an integer of more than zero and less than or equal to 3; and the ratio of the component B to the component A is 5-1,000 according to the molar ratio of aluminum to titanium. In the preparation process of the catalyst, an assisting precipitating agent is not required to be added; and the catalyst has the advantages of high activity and sensitivity to hydrogen regulation.

Description

technical field [0001] The present invention relates to a catalyst component for ethylene polymerization, its preparation method, and its application in olefin polymerization. Background technique [0002] The traditional Z-N catalyst started from the classic titanium-aluminum catalyst, and has progressed to the stage of being activated by compounds such as magnesium chloride and modified by various other organic compounds; and has developed from simply improving the catalytic activity to improving polymer products by adjusting the catalyst performance. [0003] Since the 1970s, companies such as Mitsui Petrochemical Industry Co., Ltd. of Japan have successfully developed a variety of Ti-Mg high-efficiency carrier catalysts with magnesium chloride as the carrier, which has enabled the rapid development of the world's slurry production of polyolefin industry. [0004] In the method of ethylene polymerization and copolymerization disclosed in Japanese Patent JP49-51378, the c...

AI Technical Summary

Problems solved by technology

However, since the catalyst uses alcohols and alkane solvents with large polar differences to dissolve the magnesium halide, the magnesium halide cannot be completely dissolved to form a homogeneous solution, but only a fine colloidal suspension or a swollen halogenated halide. Magnesium slurry

This brings some disadvantages related to the layered crystallization characteristics of magnesium halide to the prepared catalyst, such as: the prepared polymer has low apparent density, poor particle shape and distribution, etc.

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