Asymmetric acenaphthenequinone (alpha-diimine) nickel catalyst, its preparation method and application

By preparing acenaphthoquinone-modified asymmetric (α-diimine) nickel catalysts, the problem of insufficient crystallinity in existing catalysts was solved, and polymers with high crystallinity, high molecular weight and low branching degree were achieved, which improved the mechanical and thermal stability of the materials and made them suitable for high-end industrial applications.

CN122301949APending Publication Date: 2026-06-30HANGZHOU XINGCHUAN NOVEL MATERIALS TECHNOLOGY CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HANGZHOU XINGCHUAN NOVEL MATERIALS TECHNOLOGY CO LTD
Filing Date
2026-05-27
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing (α-diimine) nickel catalysts are insufficient in improving the crystallinity of polyethylene, resulting in inadequate mechanical strength, heat resistance, and barrier properties of the material, making it difficult to meet the needs of high-end industrial applications.

Method used

A ligand with a large sterically hindered group was prepared by using an asymmetric (α-diimine) nickel catalyst modified with acenaphthene quinone via a ketone-amine condensation reaction. This ligand was then complexed with nickel dibromide diethylene glycol to form a catalyst. Alkyl aluminum chloride was then used as a co-catalyst to catalyze the polymerization of ethylene or propylene.

Benefits of technology

It improves the crystallinity and molecular weight of the polymer products, enhances the mechanical properties and thermal stability of the materials, and reduces the degree of branching, thus meeting the needs of high-end industrial applications and reducing production costs.

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Abstract

This invention discloses an asymmetric (α-diimine) nickel olefin catalyst based on acenaphthoquinone as the framework, its preparation method, and its applications. The structure of the catalyst is shown in formula (I), where X is chlorine or bromine. The catalyst has a simple preparation process and exhibits results contrary to general trends in ethylene polymerization: larger substituents lead to higher crystallinity in the polymerization product. Furthermore, the catalyst demonstrates good thermal stability and polymerization activity, showing promising prospects for industrial applications. Formula (I)
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