Fully flexible alpha-diimine catalyst and catalytic application thereof

By designing a fully flexible α-diimine catalyst, using a flexible cyclohexyl framework and axially flexible cycloalkyl substituent, the problems of poor solubility and limited activity in the prior art are solved, and efficient dispersion and high activity catalysis in alkane solvents are achieved, and the efficiency of industrial production is improved.

CN119930879AActive Publication Date: 2025-05-06ANHUI NORMAL UNIV
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Patent Information

Application Number
CN202510127231.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-02-01
Publication Date
2025-05-06
Estimated Expiration
2045-02-01

AI Technical Summary

Technical Problem

The rigid α-diimine catalyst in the prior art has poor solubility in alkane solvents, is prone to deposition and blockage of pipelines, and is limited in catalytic activity, which limits its application in large-scale industrial production.

Method used

A fully flexible α-diimine catalyst was designed, using a flexible cyclohexyl framework and an axial flexible cycloalkyl substituent to improve solubility, avoid deposition, and enhance catalytic activity by introducing cycloalkyl substituents.

Benefits of technology

Highly efficient dispersion is achieved among commonly used alkanes in the industry, avoiding catalyst deposition and pipeline blockage, significantly improving the activity of ethylene polymerization, and improving the efficiency and benefits of industrial production.

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Abstract

The invention discloses a full-flexible alpha-diimine catalyst and a catalytic application thereof. According to the invention, 1, 2-cyclohexanedione is taken as a core skeleton, and a flexible and large-steric-hindrance naphthenic imine group is ingeniously grafted on the core skeleton, so that the innovative design greatly improves the efficiency of a catalytic system and promotes the generation of polyethylene with higher branching degree and higher molecular weight. The prepared polyethylene material is expected to become a new favorite of high-performance thermoplastic elastomers by virtue of excellent mechanical properties and excellent elastic recovery capability. In a palladium-catalyzed ethylene polymerization reaction, the full-flexible palladium catalyst shows moderate catalytic activity, and a generated polyethylene product is high in branch density, and the molecular weight is also remarkably improved. More noticeably, under the copolymerization experiment condition, the efficient doping of the polar monomer methyl acrylate is successfully realized, the copolymer with considerable polar monomer content is prepared, and a new path is opened up for the modification and functionalization of the polyethylene material.
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