Olefin polymerization catalyst as well as preparation method and application thereof

Abstract

The invention relates to an olefin polymerization catalyst as well as a preparation method and application thereof. The olefin polymerization catalyst consists of a main catalyst component and a cocatalyst, wherein the main catalyst component is prepared by the following method: (1) reacting an organic magnesium compound with a hydroxyl group-containing compound in a carrier dispersant, adding a compound containing lone pair electrons for sufficient reaction, and then adding a titanium-containing compound and an inert carrier to obtain a suspension a; (2) reacting the organic magnesium compound with the hydroxyl group-containing compound in the carrier dispersant, adding the compound containing lone pair electrons for sufficient reaction, and then adding a vanadium-containing compound and the inert carrier to obtain a suspension b; (3) mixing the suspension a and the suspension b, adding an active center valence state regulator, and then drying through distillation to obtain the main catalyst component; the cocatalyst is at least one organic aluminum compound with the general formula of AlR5xCl3-x. Compared with the prior art, the olefin polymerization catalyst has the advantages of steady reaction efficiency within a relatively wide reaction temperature range, and the like.

Description

technical field

[0001] The invention relates to a catalyst, in particular to a method for preparing a multi-active center catalyst for olefin polymerization. The catalyst can maintain a stable and uniform polymerization efficiency in the range of 50-90°C, and the polymer can be made The molecular weight distribution is greatly broadened. Background technique

[0002] The molecular weight and molecular weight distribution of polyethylene have an important influence on the rheological properties of its melt and the mechanical properties of its products. Wide molecular weight distribution polyethylene is one of the important development fields of polyethylene technology in recent years. Unlike ordinary polyethylene materials, wide molecular weight distribution polyethylene can not only maintain the mechanical properties, hardness and environmental stress cracking resistance of high molecular weight polyethylene, Moreover, it can improve the processing performance of polyethyle...

Images