Support of olefinic polymerization catalyst and preparation method thereof, solid catalyst components for olefinic polymerization and olefinic polymerization catalyst

Abstract

The invention relates to a support of an olefinic polymerization catalyst and a preparation method thereof, solid catalyst components for olefinic polymerization and an olefinic polymerization catalyst. The support of the olefinic polymerization catalyst is dialkoxy magnesium. The preparation method of the support of the olefinic polymerization catalyst comprises the following steps: in an inert gas protective atmosphere, reacting magnesium and alcohol, which serve as raw materials, in the presence of a halogenating agent under reflux to prepare the dialkoxy magnesium, wherein the weight ratio of alcohol to magnesium is (4-50):1; the halogenating agent is at least one of halogen simple substances and halides, and the mol ratio of halogen atom to magnesium is (0.0002-0.2):1; and the dialkoxy magnesium is spherical particles of which the average particle size is 10-150 um and the particle size distribution index SPAN is smaller than 1.1. The olefinic polymerization catalyst prepared by the support has high activity, and the polymer has the advantages of high bulk density, good particle shape and uniform distribution; and thus, the olefinic polymerization catalyst is suitable for producing propylene homopolymer and copolymer.

Description

technical field [0001] The present invention relates to a catalyst carrier for olefin polymerization, in particular to a spherical particulate dialkoxymagnesium carrier and a preparation method thereof, and a solid catalyst component for olefin polymerization containing the carrier, and the solid catalyst assembly Olefin polymerization catalysts classified as main catalysts. Background technique [0002] Generally, olefin polymers are polymerized using a Ziegler-Natta catalyst composed of a titanium compound and an organoaluminum compound. For example, patents such as CN 85100997A and CN 1453298A use a solid catalyst component mainly composed of titanium, magnesium, chlorine and an electron donor compound, an organoaluminum compound as an auxiliary catalyst component, and a stereoregular catalyst component in the preparation of polypropylene. The catalyst of the alkoxy-organosilicon compound of the property-enhancing agent is obtained to obtain a propylene polymer. At pres...

AI Technical Summary

Problems solved by technology

In methods 3 and 4, other raw materials are required in addition to Mg and ROH, and the operation is also complicated, so it can be said that it is not preferable as a method for producing the desired fine particles

By controlling the bulk density of dialkoxymagnesium, the average particle size and other indicators, and controlling the rate at which the titanium halide starts to contact with dialkoxymagnesium to the temperature at which the reaction occurs (the heating rate is controlled at 0.5 to 20 / min Between), so as to obtain a solid catalyst component, thus can obtain a polyolefin with high isotactic, high bulk density, but its fine powder content is relatively high

Images