| 摘要 |
<p>The present invention provides a high active solid pro-catalyst component for polymerization of ethylene, method for preparation thereof and catalyst containing this pro-catalyst. This pro-catalyst is substantially composed of magnesium compound, titanium compound, electron donor, alkyl aluminium compound and gas-phase silica. It can be prepared by the method comprising, such as the steps as following: reacting magnesium powder with alkyl halide to obtain nascent state magnesium component, which is added to electron donor with titanium compound and alkyl aluminium compound to obtain the complex, and then adding the gas- phase silica to make it disperse in the liquid system thoroughly to form uniform slabby mixture, forming and drying it to obtain good morphology of pro-catalyst component particles, optionally dispersing it in the hydrocarbon solvent or inert mineral oil to form slurry. This pro- catalyst has higher ratio of magenium to titanium and titanium content, high activity, medium initial activity such that polymerization is carried out stably and there is almost no or no sheet during preparation of the pro-catalyst component.</p> |
