Catalyst component for olefin polymerization and catalyst thereof

Abstract

The invention provides a catalyst component for olefin polymerization, the catalyst component comprises an adduct shown as the general formula (I) of MgX2.m(R'OH).nE.qH2O, at least one titanium compound shown as the general formula (II) of Ti(OR)4-kXk, and at least two electron donor compounds of a and b, wherein the electron donor compound a is a diol ester compound, b is a diether compound, andthe molar ratio of a to b is 0.5-50. A catalyst shows ultra-high polymerization activity when the catalyst is used for olefin polymerization, in particular to propylene polymerization, and the obtained polymer simultaneously has wider molecular weight distribution and higher isotacticity.

Description

technical field [0001] The present invention relates to a catalyst component and catalyst for olefin polymerization, more specifically, to a spherical catalyst component containing at least two electron donor compounds, namely glycol ester compounds and diether compounds and its application. technical background [0002] It is well known that solid titanium-based catalyst components based on magnesium, titanium, halogen and electron donors are used for olefin polymerization, especially in the polymerization of propylene, which has high polymerization activity and stereospecificity. The electron donor compound is one of the essential components in the catalyst component, and with the development of the internal electron donor compound, the polyolefin catalyst is constantly updated. At present, a large number of electron donor compounds suitable for preparing Ziegler-Natta catalysts have been disclosed, mainly including: phthalates (European patent EP0045977), 1,3-diethers (E...

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Problems solved by technology

However, the present inventors found that when the spherical catalyst prepared by using diol ester compound as the internal electron donor and the magnesium chloride alcoholate as the carrier is used for propylene polymerization, the stereoregularity of the obtained polypropylene is still unsatisfactory.

When the diether compound is used as the internal electron donor, the activity of the catalyst and the isotacticity of the polymer are very high, and even a high-yield, high-isotactic polymer can be obtained without an external electron donor, but , the molecular weight distribution of the polymer obtained by this type of catalyst is narrow, which limits the application of the polymer

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