| abstract |
The invention discloses a catalyst for olefin polymerization and its application. The catalyst contains: (i) a solid catalyst component; (ii) an aluminum alkyl compound; (iii) an external electron donor compound; wherein the solid catalyst component comprises titanium, magnesium, halogen and an internal electron donor compound, The internal electron donor comprises an internal electron donor compound a and an internal electron donor compound b, the internal electron donor compound a is a diol ester compound represented by formula I, and the internal electron donor compound b is a formula In the diether compound represented by II, the external electron donor compound comprises the hydrocarbyl trihydrocarbyloxysilane compound represented by the formula VII. The activity decay of the catalyst provided by the invention is greatly slowed down under specific polymerization conditions, which is beneficial to the development of excellent products. |