Application of catalyst component in olefin polymerization

Abstract

The invention provides an application of a catalyst component A in olefin polymerization, the catalyst component is obtained by contacting a solid component a containing magnesium, titanium, halogen and an internal donor component with an organosilicon compound b containing a Si-H functional group; the magnesium in the solid component a comes from a raw material alkoxy magnesium, and the temperature of the Catalytic olefin polymerization performed by the catalyst component A is 80-130 DEG C. The prepared olefin polymerization catalyst component and the olefin polymerization catalyst have high polymerization activity during high temperature polymerization and good high-degree stereospecific capacity, the obtained polymer has high stacking density and high melt index (the catalyst has good hydrogen regulating sensitivity), and the application of the invention has good industrial application value. HsiR<1>nR<2>3-n.

Description

technical field [0001] The invention relates to the application of a catalyst component in olefin polymerization, especially its catalytic application in olefin polymerization in a high temperature state. Background technique [0002] Increasing the temperature of olefin polymerization can make the Ziggler-Natta catalyst more sensitive to molecular weight regulator hydrogen, which is very beneficial to the production of polypropylene products with high melt index. At the same time, with the increase of the polymerization reaction temperature, the stereoregularity of the produced polypropylene is further improved, which is very beneficial to the production of high rigidity propylene homopolymer products and high rigidity-toughness balance performance propylene copolymer products. Therefore, the quality of polypropylene products can be improved by increasing the polymerization reaction temperature, such as the polymerization method described in patent CN1939938, which can achi...

AI Technical Summary

Problems solved by technology

The catalyst mainly realizes the high-temperature polymerization of propylene by introducing a mixture of aluminoxane and alkylaluminum as a cocatalyst during the polymerization process, so the polymerization process is complicated, and its high-temperature polymerization activity and polymer isotacticity need to be further improved

[0006] Chinese patent CN1621421A also discloses a method for preparing a catalyst. This catalyst also realizes the high-temperature polymerization of propylene by introducing a mixture of aluminoxane and alkylaluminum as a cocatalyst during the polymerization process. Therefore, the polymerization process is also complicated and new catalysts need to be introduced The problem of components, and high temperature polymerization activity and polymer isotacticity need to be further improved

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