Olefin polymerization catalyst and preparation method thereof and olefin polymerization method

Abstract

The invention provides an olefin polymerization catalyst, which contains titanium, silicon, magnesium, phosphorus, an internal donor compound and halogen. The invention further provides a method for preparing the olefin polymerization catalyst disclosed by the invention. The invention further provides an olefin polymerization method. Silicon is introduced into the olefin polymerization catalyst, so that the catalytic activity of the olefin polymerization catalyst for olefin polymerization is 1.1-1.5 times higher than that of a catalyst into which silicon is not introduced in the prior art. According to the method for preparing the olefin polymerization catalyst disclosed by the invention, a silane compound is introduced in the contacting process of a magnesium compound, an organic epoxy compound and an organic phosphorus compound in a solvent, so that the activity of the prepared catalyst is much higher than that of a catalyst obtained with a method in which a silane compound is not introduced in the prior art. The method disclosed by the invention has the advantages of readily-available raw materials and low production cost.

Description

technical field [0001] The invention relates to an olefin polymerization catalyst, a preparation method thereof, an olefin polymerization catalyst and a method for olefin polymerization using the olefin polymerization catalyst. Background technique [0002] In the late 1970s, companies such as Mitsui Petrochemical Corporation of Japan and Monai of the United States successfully developed titanium-magnesium high-efficiency carrier catalysts with magnesium chloride as the carrier. Because the carrier was used to improve the utilization rate of the active center of the titanium atom, the catalytic activity was improved. It is much higher than conventional catalysts and simplifies the polymerization process, so the world's polyolefin industry has developed rapidly. 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 ...

AI Technical Summary

Problems solved by technology

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

[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

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