Catalyst component used for olefin polymerization and preparation method thereof and catalyst used for olefin polymerization and application

Abstract

The present invention discloses a catalyst component used for olefin polymerization and a preparation method thereof, a catalyst used for the olefin polymerization, which contains the catalyst component, and application of the catalyst used for the olefin polymerization in the olefin polymerization. The catalyst component comprises the following reaction products: 1, a magnesium-containing carrier; 2, at least one titanium compound; and 3, at least one internal electron donor, wherein the magnesium-containing carrier is a product obtained by reaction of a compound shown as a formula (1) and an oxirane compound shown as a formula (2). When the catalyst component prepared by the carrier is used for olefin (particularly propylene) polymerization, bulk density of a polymerization product can be reduced, hydrogen regulation sensitivity of the catalyst is improved, and the polymerization product is substantially free of heterogeneous materials. The formula (1) is shown as MgXY.(ROH)p.(H2O)q, and the formula (2) is as shown in the specification.

Description

technical field [0001] The invention relates to a catalyst component for olefin polymerization, a preparation method thereof, a catalyst for olefin polymerization containing the catalyst component, and an application of the catalyst for olefin polymerization in olefin polymerization. Background technique [0002] It is well known that the Ziegler-Natta catalyst supported by magnesium chloride alcoholate is significantly better than catalysts supported by other supports when it is used for the polymerization of olefins (especially propylene). Therefore, most of the catalysts currently used for olefin polymerization are prepared by loading titanium halide on magnesium chloride alcoholate. In order to obtain a spherical carrier, it can be prepared by methods such as spray drying, spray cooling, high-pressure extrusion, high-speed stirring, emulsifying machine method, and high-gravity rotating bed method. After quenching the alcoholate system, a spherical alcoholate is formed. ...

AI Technical Summary

Problems solved by technology

However, the catalyst carrier prepared by this method has the disadvantages of unstable preparation process, easy carrier adhesion, and poor carrier molding effect.

[0005] In US4861847, epoxy compounds and tributyl phosphate compounds are used to dissolve magnesium chloride to form a uniform solution, and then titanium tetrachloride is used to precipitate the carrier and carry out titanium loading. The reaction products are very complicated, and the generated by-products are difficult to handle. During the precipitation of titanium tetrachloride, some precipitation aids are also used, which makes the reaction by-products more complicated and the shape of the carrier is difficult to control

There is also a technology to add alcohol to the above dissolution system. The addition of alcohol accelerates the dissolution of tributyl phosphate and epoxy, but it can interact with titanium tetrachloride and affect the subsequent catalyst morphology and performance. have an impact

These technologies all use titanium tetrachloride to precipitate the carrier to prepare the catalyst. As mentioned above, the reaction is complicated and the waste liquid cannot be recovered. Especially after alcohol is introduced into the solution system, the shape of the carrier is more difficult to control.

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