Catalyst precursor and its preparation method, catalyst and its application, and ethylene polymerization method

Abstract

The invention discloses a catalyst precursor and its preparation method, a catalyst and its application, and an ethylene polymerization method. The catalyst precursor is a bimetallic catalyst precursor which has an open structure shown as a formula I and is based on a salicylaldehyde imine ligand, the preparation method of the catalyst precursor is as follows: under complexation reaction conditions, contacting a compound having a structure shown as a formula IV with a compound with a molecular structure general formula of MCl4 (THF) 2 in an organic solvent; the catalyst provided by the invention comprises the catalyst precursor and alkyl aluminoxane; the invention also provides the application of the catalyst in olefin polymerization, the invention also provides the ethylene polymerization method which is as follows: under olefin polymerization conditions, in the presence of an organic solvent, contacting ethylene with the catalyst precursor and the alkyl aluminoxane for polymerization. The preparation method of the catalyst precursor is simple, and the catalyst is high in catalytic efficiency. The formula I and the formula IV are shown in the specification.

Description

technical field

[0001] The invention relates to the field of olefin coordination polymerization, in particular to a catalyst precursor and a preparation method thereof, a catalyst containing the catalyst precursor, an application of the catalyst in olefin polymerization, and an ethylene polymerization method. Background technique

[0002] Polyolefin materials are widely used in various fields of the national economy due to their relatively small density, good chemical resistance, water resistance, good mechanical strength, and electrical insulation.

[0003] Coordination polymerization represented by Ziegler-Natta catalysts and metallocene catalysts has promoted the rapid development of the polyolefin industry and gradually matured. Nowadays, non-metallocene catalysts have become a hotspot in the field of coordination polymerization, and salicylaldimine ligand transition metal catalysts are one of them. This type of catalyst has good olefin catalytic activity, for example: ...

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