Olefin polymerization catalyst and preparation method thereof and olefin polymerization method

Abstract

The invention provides an olefin polymerization catalyst and a preparation method thereof. The method comprises the following steps of: (1) enabling a magnesium compound, an organic epoxy compound, an organic phosphorus compound and an internal donor compound to contact in a solvent to form a uniform solution; and (2) enabling the uniform solution to contact with a titanium compound in the presence of an assistant precipitation agent to obtain a solid precipitate serving as the catalyst. The invention provides an olefin polymerization method. According to the method for preparing the olefin polymerization catalyst, an internal donor is introduced in the contacting process of the magnesium compound, the organic epoxy compound and the organic phosphorus compound in the solvent, so that the obtained catalyst has much higher activity than a catalyst obtained by loading the internal dolor onto a solid precipitate containing magnesium and titanium, obtained by adopting an assistant precipitation agent, in the prior art, and the catalytic activity of the catalyst for olefin polymerization is 1.1-1.5 times higher than that of a catalyst in the prior art.

Description

technical field [0001] The invention relates to a method for preparing an olefin polymerization catalyst, an olefin polymerization catalyst obtained by the method, 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 m...

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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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