Propene polymer and preparation method and application thereof

Abstract

The invention provides a propene polymer, a preparation method and an application thereof; according to the method, propene, ethene and alpha-olefins selected from C4-C8 contact with an olefin polymerization catalyst system under an olefin vapor phase polymerization condition in a vapor phase polymerization reactor; the olefin polymerization catalyst system comprises a solid component, an external electron donor compound and an organo-aluminum compound; the solid component comprises a carrier, and a titanium compound and an internal electron donor compound loaded on the carrier; the particle size of the solid component is within a range of 8-150 microns; and the particle size distribution curve of the solid component has unimodal distribution. The method of the invention can effectively inhibit mutual adhesion and caking of polymer particles during the vapor phase polymerization process, and thus ensure the smooth production process; the propene polymer of the invention is uniform in composition, stable in performance, and quite suitable for polymer film preparation.

Description

Technical field [0001] The invention relates to a propylene polymer and its preparation method and application. Background technique [0002] Propylene terpolymers are usually formed by copolymerizing propylene, ethylene, and α-olefins other than propylene. Copolymerizing propylene with ethylene and α-olefins other than propylene, thereby introducing structural units derived from ethylene and structural units derived from α-olefins other than propylene into the macromolecular chain of propylene homopolymers can reduce propylene The crystallization temperature of the homopolymer improves the performance of the propylene homopolymer product, and the propylene terpolymer formed therefrom has unique advantages when used in the preparation of polymer films. [0003] CN1107084C discloses a propylene terpolymer which contains ethylene and at least one selected from C 4 -C 8 The comonomer unit of α-olefin, wherein the ethylene content is 0.3-10% by weight, the α-olefin content is 1-25% by...

AI Technical Summary

Problems solved by technology

[0005] However, when the existing gas-phase polymerization method is used to prepare propylene terpolymers, since the generated propylene terpolymers exist in the reactor in the form of particles or powders, these particles and powders tend to stick to each other Or agglomeration, blocking the material discharge pipe of the reactor, making the continuous production stop, and adversely affecting the production efficiency

In addition, due to the mutual adhesion or agglomeration between particles and powder, it will also hinder the diffusion of polymerized monomers into the catalyst, and combine with the active center on the catalyst to carry out polymerization reaction, so that the composition of the prepared polymer product is not uniform, and the performance Also, these polymer products are prone to film tearing when used to make polymer films

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