Olefin polymerization catalyst, and preparation method and application thereof

Abstract

The invention discloses an olefin polymerization catalyst. The catalyst comprises a magnesium compound, an organic alcohol ether compound, an organophosphorus compound, an organic epoxy compound, a precipitation aid, an internal electron donor and a titanium compound. The catalyst has the advantages of high activity in olefin polymerization reactions, good hydrogen sensitivity, granule shape improvement and few polymer fine powder.

Description

technical field [0001] The invention relates to a catalyst for olefin polymerization and its preparation method and application, in particular to a catalyst for olefin polymerization modified by an organic alcohol ether compound and its preparation method and application. Background technique [0002] Conventional methods for preparing highly active supported catalysts are generally co-grinding, grinding and impregnating, spraying carrier forming and high-speed stirring carrier forming, etc. The main disadvantage of the catalyst obtained by the grinding method is that the particle shape of the obtained catalyst is not good and the particle size distribution is wide, so the obtained polymer particle shape is not good, there are many fine powders, and the apparent density is low, which increases difficulties for the production device, and the catalytic activity is low. The directional ability is not ideal; the catalyst prepared by the spray carrier forming method and the high-...

AI Technical Summary

Problems solved by technology

When this catalyst system is used for propylene polymerization, the obtained polymer has high isotacticity and high apparent density, but the catalyst activity is not high and the particle shape is not very good

[0004] CN1453298A discloses a class of glycol ester compounds containing special structures as electron donors. The use of such electron donors can not only improve the activity of the catalyst, but also significantly broaden the molecular weight distribution of the resulting propylene polymer. The synthesis and purification process of the compound is complicated, which makes the catalyst production cost higher

[0005] At present, there are few reports on the application of organic alcohol ethers in Z-N catalysts, especially for improving catalyst activity and hydrogen tuning performance.

Images