| 摘要 |
A catalyst active component for ethylene polymerization or copolymerization, preparation method thereof and a catalyst using said active component. The catalyst active component according to invention comprises from 12.0 to 18.0 parts by weight magnesium, from 4.0 to 8.0 parts by weight titanium, from 1.1 to 11.0 parts by weight alkoxy, from 0.5 to 2.5 parts by weight silicon, and from 55.0 to 75.0 parts by weight halogen, based on 100 parts by weight the total weight of the catalyst active component. The preparation method of the active compent as described above according to invention includes steps of making a magnesium alcoholate slurry, reacting of said slurry with an electron donor, pre-supporting titanium reaction and supporting titanium reaction. The catalyst of invention has high catalytic activity, good copolymerization performance, good hydrogen response and high melt index. The polyethylene product has good morphology, uniform particle size distribution, high bulk density, good physics property, and high impact strength. The catalyst can be used to produce high density and high strength polyethylene. |
