WIDELY DISTRIBUTED POLYOLEFIN CATALYST, AND PREPARATION AND APPLICATION THEREOF

摘要

The present invention relates to a widely distributed polyolefin catalyst, and preparation and an application thereof. A main catalyst comprises a carrier, a transition metal halide, an organic alcoholic compound, and a siloxane electron donor in a mol ratio of 1:(1-30):(0.5-30):(0.01-5); the transition metal halide is generated by titanate and silicon halide through in-situ reaction in a mol ratio of 1:(1-30):(1-40), and a mol ratio of the titanate and the silicon halide is 1:(0.5-2); a co-catalyst is an organic aluminum compound; and a mol ratio of the transition metal halide in the main catalyst and the co-catalyst is 1:(30-500). The particles in the catalyst of the present invention are excellent in shape and are spherical; the catalyst has high activity and widely distributed polymer molecular weight; the catalyst is applicable to a slurry process, a gas phase polymerization process, or a combined polymerization process; and the preparation method is simple, has low requirements on equipment, and produces little pollution to the environment.