Preparation methods and applications of polypropylene, polypropylene and its applications

By employing a two-stage polymerization reaction and the use of a specific external electron donor, the problem of low melt strength in polypropylene in existing technologies has been solved, resulting in the preparation of polypropylene with high isotacticity, a wide molecular weight distribution, and high melt strength and heat resistance.

CN122080276APending Publication Date: 2026-05-26CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Application Number
CN202411703137.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-26
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing methods for preparing high melt strength polypropylene are inefficient, and polypropylene produced using modulated polymerization processes has relatively low melt strength.

Method used

A two-stage polymerization reaction is employed, in which a functional external electron donor is introduced in the first polymerization reaction. The types and amounts of the first and second external electron donors are controlled, and the amount of molecular weight regulator is combined to prepare polypropylene with high isotacticity and a wide molecular weight distribution.

Benefits of technology

The prepared polypropylene has high melt strength, heat resistance and good processing properties, wide molecular weight distribution and high flexural modulus.

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Abstract

This invention relates to the field of propylene polymerization, and discloses a method for preparing polypropylene and its applications, as well as polypropylene and its applications. The method includes: S1, conducting a first polymerization reaction of propylene in the presence of a first molecular weight regulator, a first external electron donor, a functional external electron donor, and a catalyst system to obtain polymer A; S2, conducting a second polymerization reaction of propylene in the presence of a second molecular weight regulator, a second external electron donor, and polymer A to obtain polypropylene; the amount of the first molecular weight regulator is less than the amount of the second molecular weight regulator. This method introduces a functional external electron donor during the first polymerization process, while simultaneously controlling the first and second external electron donors to meet specific types and controlling the amount of molecular weight regulator at different polymerization stages, enabling the obtained polypropylene to possess both good processing properties and heat resistance.
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Citation Information

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