Catalyst ingredient for olefin polymerization and preparation method thereof

Abstract

The invention provides a catalyst ingredient for olefin polymerization, its preparation method and application. The ingredient comprises at least one organic magnesium compound, at least one liquid titaniferous compound, at least one hydroxyl compound, at least one chlorine-containing organosilicon compound, and at least one reaction product of a forming and precipitating aid, wherein, the forming and precipitating aid is a polystyrene block polybutadiene polymer. The prepared catalyst has good hydrogen regulation performance, good particle shape and distribution, which is advantageous for the use of the catalyst in gas phase, slurry and other polymerization devices.

Description

technical field [0001] The present invention relates to a catalyst component for olefin polymerization or copolymerization and its catalyst, as well as the preparation method and application of the catalyst component. technical background [0002] Since the successful development of high-efficiency polyolefin catalysts in the 1970s, the world polyolefin industry has undergone tremendous changes. Over the past 20 years, with the development of olefin polymerization process, the catalysts matching the polymerization process have also made great progress. Among them, high-efficiency catalysts still occupy an important role in the field of polyolefin catalysts due to their excellent polymerization performance and mature application technology. status. After years of exploration and research, the preparation method of Mg-Ti high-efficiency catalyst has also developed from the co-grinding method and the suspension impregnation method to the chemical reaction method. In the chemi...

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Problems solved by technology

In this type of Mg-Ti catalyst, there is a fatal shortcoming that it is difficult to control the shaping step, and thus it is difficult to control the morphology of the prepared catalyst particles

[0003] The recent development is to add some emulsifier-like substances to the dispersion system of the catalyst precursor containing magnesium / titanium compounds to form an emulsion, and then react to precipitate catalyst particles, which can improve the particle morphology of the resulting catalyst, such as EP0258089A The perfluoropolyether used in the Chinese patent CN1537118A uses perfluorooctane. The forming steps of these methods are complicated and difficult to control, and the shape of the obtained catalyst particles is not easy to control, and the materials used are expensive and difficult to obtain.

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