Polyurethane structural adhesive dispergator as well as preparation method and application thereof

CN121046152APending Publication Date: 2025-12-02SOUTH CHINA UNIV OF TECH
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Patent Information

Application Number
CN202511206565.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-27
Publication Date
2025-12-02

AI Technical Summary

Technical Problem

Existing debonding technologies are difficult to efficiently and safely remove high-density, high-viscosity polyurethane structural adhesives from new energy power batteries. In particular, during automated disassembly, the debonding efficiency is low for thick adhesive layers and aged adhesive bonding areas, and there is a risk of corrosion to the metal casing.

Method used

A degumming agent system comprising polar organic solvents, alcohol additives, alkaline catalysts, ionic liquids, and surfactants is employed. Through swelling penetration, nucleophilic bond breaking, and polarity matching mechanisms, the polyurethane structural adhesive is rapidly softened and completely removed at low temperatures, avoiding damage to the metal and battery cell.

Benefits of technology

This technology enables efficient and controllable depolymerization of polyurethane structural adhesive at low temperatures, reducing depolymerization time, improving automated disassembly efficiency, reducing the risk of corrosion to the metal casing, and ensuring the integrity and safety of the battery cell.

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Abstract

The invention discloses a dispergator of a polyurethane structural adhesive as well as a preparation method and application of the dispergator. The dispergator comprises a polar organic solvent, an alcohol additive, a basic catalyst, an ionic liquid and a surfactant. The dispergator is suitable for removing a bonding interface of a thermosetting polyurethane structural adhesive in a power battery module, the dispergation process is mild and safe, and swelling, fracture and interface release of the structural adhesive can be realized in a range from normal temperature to 55 DEG C. Compared with a traditional high-corrosion and high-energy-consumption dispergation means, the dispergation agent has the advantages of being high in degumming efficiency, little in residual gum, free of base material corrosion and the like, is suitable for the environment-friendly recycling and reusing scene of the retired lithium battery, and has good engineering practicability and popularization value.
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Citation Information

Patent Citations

  • Neutral dispergator as well as preparation method and application thereof

    CN117673514A

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