A kind of preparation method for organic carrier of olefin polymerization catalyst

Abstract

The invention relates to a preparation method for an organic carrier used for an alkene polymerization catalyst. The preparation method mainly comprises the following steps: (1) under a room temperature, adding copolymerization monomer divinyl benzene and methylacrylic acid hydroxyalkyl ester into a dispersion liquid of a saturated carboxylic ester with 4-7 carbon atoms, or adding a third monomerstyrene to obtain a terpolymer; (2) adding a stabilizer polypropylene oxide-polyethylene oxide copolymer under a temperature of 20-50 DEG C, wherein the ratio of the stabilizer adding amount to the monomer total adding amount is (0.5-5):100; and (3) adding a free radical initiator, raising the temperature to 60-80 DEG C, and performing a reaction for 3-12h, wherein the ratio of the initiator adding amount to the monomer total adding amount is (0.5-3):100, performing washing on the obtained polymer to remove impurities, and performing drying to obtain the organic carrier. According to the invention, the specific dispersion liquid and a dispersion polymerization method are adopted, thus the preparation method is simple and environmentally friendly, and the obtained organic carrier has a higher pore volume and a higher average pore size.

Description

technical field [0001] The invention relates to a method for preparing a catalyst organic carrier. Background technique [0002] At present, the vast majority of commercial olefin polymerization catalysts use supported catalysts, and the catalysts usually use inorganic substances to support the catalyst. Patents CN98126385, CN1174549, and CN1356343 report that inorganic substances such as magnesium chloride, silicon dioxide, aluminum oxide, magnesium carbonate, etc. are used as carriers to prepare supported Ziegler-Natta and metallocene catalysts, but these inorganic carriers will affect the performance of polyolefins after being introduced into polymers . In recent years, due to the unique properties of organic polymer carriers with porous structures, such as high activity and good copolymerization performance, especially the prepared polymer products have low inorganic ash content, etc., they are increasingly attracting attention from industry and academia. . [0003] A...

AI Technical Summary

Problems solved by technology

This method uses a two-step swelling method to prepare monodisperse porous microspheres. The preparation method is relatively complicated and the prepared polymer particles have a small particle size. The specific surface area and average pore size of the particles are uncontrollable, which is not conducive to the loading of metallocene catalysts.

[0004] Chinese patent application numbers 201310520354.4, 201310520841.0 and 201310520839.3 use a system composed of a lower alcohol with 1-4 carbon atoms and a water system as a dispersion liquid for dispersion polymerization, using divinylbenzene and styrene as polymerization monomers, and introducing another functional unit Hydroxymethacrylate is used to prepare terpolymers. Although the prepared terpolymer carrier is monodisperse porous microspheres, and the particle size and pore size of the carrier particles are controllable, the improvement of the pore size usually depends on the reduction of the pore volume. cost, which is not conducive to the loading of metallocene catalysts, or additional porogens need to be added

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