Supported non-metallocene catalyst used for ethylene polymerization

Abstract

The invention relates to a supported non-metallocene catalyst used for ethylene polymerization and a preparation method thereof. The catalyst comprises a non-metallocene compound, chlorinated alkyl silicon, alkyl aluminoxane and a silica gel carrier reaction product; the preparation method comprises the following steps: 1) preparation of a chlorinated alkyl silicon modified silica gel carrier, 2)preparation of an alkyl aluminoxane modified silica gel carrier, and 3)preparation of the modified silica gel supported non-metallocene catalyst; and the obtained non-metallocene catalyst has high polymerization activity for catalyzing vinyl polymerization or copolymerization. The preparation method of the silica gel carrier is simple, and the obtained supported catalyst particles have good particle morphology and have 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 containing phenoxy-imine ligands (EP0874005, WO0155231) have high catalytic olefin polymerization activity, and can obtain functionalized polyolefin resins, which have good applications prospect. 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 ...

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 have been a lot of reports on the support of non-metallocene catalysts in recent years, such as patents CN1539855A, CN1539856A, CN1789291, CN1789292, CN1962702A, CN1769309A, CN1769310A, CN101423573A, CN101798361A, CN102399313A, etc., which provide a variety of ways to obtain non-supported loads Metallocene catalysts, wherein the catalysts using anhydrous magnesium chloride to support non-metallocenes have good particle morphology, such as CN102039186A, CN102039189A, CN102039187A, CN102039185A, CN101942048A, but such catalysts have poor strength and are easily broken in the polymerization reactor, resulting in polymerization The shape of the substance is not good, and the carrier contains alcohol, water, alkoxy and other components, and the preparation of the carrier is complicated

And take SiO2 as the catalyst report research of carrier also a lot, as CN102399331A, CN1539855A, CN1769309A, CN1727062A, CN1962702A, but carrier preparation is complicated, still will introduce a large amount of methylalumoxanes in polymerization process, above shortcoming has limited silica gel loading Industrial Applications of Metallocene Catalysts

[0004] There are also literatures that use composite carriers such as magnesium chloride and silica gel to support non-metallocenes (CN1539856A, CN102399317A, CN102039185A, CN102399331A, CN101423574A, CN1539855A), but the preparation method of the supported catalyst is complicated, and a large amount of MAO needs to be added during polymerization.

Images