abstract |
The present invention provides an application of a catalyst component A in olefin polymerization, which is obtained by contacting a solid component a containing magnesium, titanium, halogen and an internal electron donor compound with an organosilicon compound b; The magnesium in the solid component a comes from the raw material alkoxymagnesium, and the organosilicon compound b is a chain polysiloxane b1 as shown in formula (I x ) or formula (I y ) containing Si-H functional groups ) for the cyclic polysiloxane b2, the temperature at which the catalyst component A participates in catalyzing olefin polymerization is 80-130°C. The olefin polymerization catalyst component and the olefin polymerization catalyst prepared by the present invention still have high polymerization activity, good stereospecific ability, high bulk density of the obtained polymer, and high polymer melt index (good hydrogenation sensitivity of the catalyst) during high-temperature polymerization. Comprehensive performance, with good industrial application value. |