Component for olefinic polymerization loaded on nano carrier as well as its preparing method and application

Abstract

The invention provides a catalyst component for olefin polymerization, which is a reaction product of a magnesium compound, a transition metal titanium compound and an electron donor compound loaded on a carrier, the average particle diameter of the carrier is less than 100nm, and the catalyst The content of titanium in the component is relatively high, and it has a relatively high polymerization activity for ethylene polymerization. The resulting polymer has a narrow particle size distribution, and can stably control the particle size and particle size distribution. Moreover, the synthesis process of the catalyst component is simple, the synthesis yield is high, the conversion rate of titanium tetrachloride is greatly improved, and the cost of the catalyst is reduced.

Description

technical field [0001] The invention relates to a catalyst component for olefin polymerization, its preparation method and application, more specifically, it relates to a catalyst component for olefin polymerization loaded on a nano-scale carrier, its preparation method and application. technical background [0002] Ti / Mg catalysts play a dominant role in the synthesis of polyethylene, and the core of its research is nothing more than the polymerization activity of the catalyst, the particle shape of the catalyst, the copolymerization performance of the catalyst, the apparent density of the polymer and the cost of the catalyst. In the industrial application of catalysts, it is very important to control the particle size and particle size distribution of the produced ethylene polymer. Different resin grades have different particle size requirements. For example, the particle size of polyethylene for chlorination is required to be 300~ Between 125 microns, while the particle s...

AI Technical Summary

Problems solved by technology

However, due to the limited loading of active components on the carrier, the titanium content in the catalyst prepared by this method is low, and the polymerization activity is not high

[0008] In the patent CN1268520, magnesium chloride and silicon dioxide are used as the carrier, and titanium tetrachloride is used as the active component. The preparation method of the catalyst is as follows: MgCl 2 in THF with IiCl 4 reaction, and then with SiO treated with alkylaluminum 2 Mixing, removing THF and reacting with alkylaluminum in hexane solvent, the prepared catalyst is used for ethylene polymerization, although an active accelerator is used in the polymerization, due to the low content of titanium in the catalyst, the polymerization activity is still low