| abstract |
The present invention relates to a supported polyolefin catalyst and the preparation and application thereof, wherein a main catalyst is composed by a carrier and a transition metal halide, and the carrier is composed by a magnesium halide compound, a silicon halide compound, an alcohol with a number of carbon atoms less than or equal to C5, and an alcohol with a number of carbon atoms of C6-C20 at a mole ratio of 1:(0.1-20):(0.1-5):(0.01-10); the mole ratio of the magnesium halide compound to the transition metal halide is 1:(0.1-30); an organic alcohol ether compound is added during the preparation of the main catalyst, the mass ratio of the magnesium halide compound to the organic alcohol ether compound being 100:(0.1-20); and the mole ratio of the transition metal halide in the main catalyst to a co-catalyst is 1:30-500. The present catalyst has good particle morphology and uniform particle size distribution, the polymer obtained through catalysis has a low fine powder content and a relatively high bulk density, and the catalyst is suitable for an alkene slurry polymerisation process, a gas phase polymerisation process or a combined polymerisation process. |