Olefin polymerization catalyst and preparation and application thereof

Abstract

The invention relates to an olefin polymerization catalyst and preparation and application thereof. A main catalyst consists of a carrier, a transition metal halide, an organic alcohol compound and an organosiloxane compound, wherein the molar ratio of the carrier to the transition metal halide to the organic alcohol compound to the organosiloxane compound is 1:(0.01-20):(0.1-6):(0.01-5); and the molar ratio of the transition metal halides in an assistant catalyst and the main catalyst is (30-500):1. In the preparation process, an assistant precipitation agent is added, wherein the assistant precipitation agent is alkane with the carbon atom number of 5 to 20 or cyclane with the carbon atom number of 5 to 20; and the mass ratio of the assistant precipitation agent to the carrier is (5-100):1. The olefin polymerization catalyst has the advantages of suitability for slurry process, gas-phase polymerization technology or combined polymerization technology, high catalyst activity, simple preparation method, low equipment requirement and less environmental pollution.

Description

technical field

[0001] The present invention relates to a catalyst for ethylene polymerization or copolymerization and its preparation and application. Background technique

[0002] Olefin polymerization catalysts are the core of polyolefin polymerization technology. From the perspective of the development of olefin polymerization catalysts, there are two main aspects: (1) the development of polyolefin resin catalysts that can prepare special or better performance, such as metallocene catalysts (2) For the production of general-purpose polyolefin resins, on the basis of further improving catalyst performance, simplify the catalyst preparation process, reduce catalyst costs, and develop environmentally friendly technologies to improve efficiency ,Increase competitiveness. Before the 1980s, the focus of polyethylene catalyst research was on the pursuit of catalyst efficiency. After nearly 30 years of hard work, the catalytic efficiency of polyethylene catalysts has been impro...

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