Transparent dynamic covalent cross-linked polyurethane plate capable of being processed and remolded and preparation method of transparent dynamic covalent cross-linked polyurethane plate

By introducing thermally responsive dynamic covalent bonds into the polyurethane network structure, the problems of traditional polyurethane materials being non-reshapeable and prone to yellowing are solved, achieving reversible processing and high transparency, making it suitable for the reuse and complex molding of high-end transparent structural components.

CN121758710APending Publication Date: 2026-03-31DONGHUA UNIV
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Patent Information

Application Number
CN202511719722.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-11-21
Publication Date
2026-03-31

AI Technical Summary

Technical Problem

The irreversible cross-linked structure of traditional thermosetting polyurethane materials makes them impossible to reshape by heating, resulting in serious waste of resources. Furthermore, they are prone to yellowing under light, heat, oxygen, or humid conditions, and their transparency is unstable, limiting their application in high-end transparent fields.

Method used

By introducing thermally responsive dynamic covalent bonds into the polyurethane network structure and constructing a reversible cross-linked structure through hydrogen bonding, and combining polyisocyanates, polyol chain extenders, and functional cross-linking agents, a dynamically covalently cross-linked polyurethane board with thermal stimulus response is formed.

Benefits of technology

It achieves reversible processability and high transparency of materials, improves mechanical properties, and solves the problems of non-reshapeability and transparency of traditional polyurethane materials, making it suitable for the reuse and complex molding of high-end transparent structural components.

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Abstract

The invention relates to a transparent dynamic covalent cross-linked polyurethane plate capable of being processed and remolded and a preparation method of the transparent dynamic covalent cross-linked polyurethane plate. The transparent dynamic covalent cross-linked polyurethane plate comprises the following raw material components: polyisocyanate, a polyol chain extender, a functional cross-linking agent, a solvent and a catalyst, the plate structurally comprises at least one of boric acid ester with a thermal stimulation response function, Diels-Alder reaction, thiocarbamate bonds, oxime urethane bonds, disulfide bonds, imine bonds and carbamate bonds. According to the invention, dynamic covalent bonds with thermal response characteristics are introduced into cross-linking points, and the cross-linked polyurethane plate with high transparency, high mechanical strength and reversible processability is constructed through interaction and synergy with rich hydrogen bonds in polyurethane.
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