A supported non-metallocene catalyst for ethylene polymerization

Abstract

The invention discloses a supported non-metallocene catalyst for ethylene polymerization and a preparation method. The catalyst comprises (a) a non-metallocene compound; (b) chlorinated hydrocarbyl silicon; (c) alkylaluminoxane (d ) reaction product of silica gel carrier; its preparation method includes: (1) preparation of chlorinated hydrocarbyl silicon modified silica gel carrier (2) preparation of alkyl aluminoxane modified silica gel carrier (3) modified silica gel supported non-metallocene catalyst The obtained non-metallocene catalyst catalyzes ethylene polymerization or copolymerization and has high polymerization activity. The preparation method of the silica gel carrier used is simple, and the obtained loaded catalyst particle has good shape and adjustable size.

Description

technical field [0001] The invention relates to a preparation method of a supported non-metallocene catalyst for ethylene polymerization, and the application of the obtained catalyst in olefin polymerization. technical background [0002] In the development of olefin polymerization catalysts, non-metallocene catalysts developed in the 1990s have received great development and attention. In particular, the Group IV transition metal complexes (EP 0874005, WO 0155231) containing phenoxy-imine ligands have high catalytic olefin polymerization activity, and can obtain functionalized polyolefin resins with good application prospects. However, homogeneous catalysts have been proved to have shortcomings such as short activity duration, easy sticking to the kettle, high amount of cocatalyst methylaluminoxane, and too low or too high molecular weight of the obtained polymer in olefin polymerization. The solution polymerization process or high pressure polymerization process of olefi...

AI Technical Summary

Problems solved by technology

However, homogeneous catalysts have been proved to have shortcomings such as short activity duration, easy sticking to the kettle, high amount of cocatalyst methylaluminoxane, and too low or too high molecular weight of the obtained polymer in olefin polymerization. The solution polymerization process or high pressure polymerization process of olefins severely limits its industrial application range

[0003] At present, there are many reports on the support of non-metallocene catalysts in recent years, such as patents CN1539855A, CN1539856A, CN 1789291, CN 1789292, CN 1962702A, CN1769309A, CN 1769310A, CN101423573A, CN 101798361A, CN 102399313A, etc. Loading to obtain a supported non-metallocene catalyst, wherein anhydrous magnesium chloride is used to support a non-metallocene catalyst with good particle morphology, such as CN 102039189A, CN 102039187A, CN 102039185A, CN 101942048A, but this type of catalyst has poor strength and is It is easy to break in the polymerization reactor, which leads to poor polymer morphology, and the carrier contains alcohol, water, alkoxy and other components, and the preparation of the carrier is complicated

And with Si0 2 There are also many reports and studies on catalysts as carriers, such as CN 102399331A, CN 1539855A, CN 1769309A, CN 1727062A, CN 1962702A, but the preparation of the carrier is complicated, and a large amount of methylalumoxane still needs to be introduced during the polymerization process. The above shortcomings limit the silica gel. Industrial Applications of Supported Non-metallocene Catalysts

[0004] There are also literatures that use composite carriers containing magnesium chloride, silica gel, etc. to load non-metallocenes (CN 1539856A, CN 102399317A, CN 102039185A, CN 102399331A, CN 101423574A, CN 1539855A), but the preparation method of the supported catalyst is complicated, and a large amount of MAO needs to be added during polymerization

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