Polycaprolactone dihydric alcohol containing maleimide group as well as preparation method and application of polycaprolactone dihydric alcohol

Self-healing polyurethane elastomers were constructed by reacting polycaprolactone diol containing maleimide groups with Diels-Alder, which solved the problem of performance degradation of polyurethane elastomers after damage, and achieved multiple self-healing and stable mechanical properties, making them suitable for building materials and mechanical industries.

CN121293485AActive Publication Date: 2026-01-09HUNAN JUREN CHEMICAL NEW MATERIAL TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202511872512.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-12
Publication Date
2026-01-09
Estimated Expiration
2045-12-12

AI Technical Summary

Technical Problem

Existing polyurethane elastomers are prone to localized damage and microcracks during processing, transportation, storage and use, and have limited self-healing ability. The material properties deteriorate rapidly after multiple repairs, and the mechanical properties are unstable.

Method used

Using polycaprolactone diol containing maleimide groups as raw material, a self-healing polyurethane elastomer is constructed through the Diels-Alder reaction. By controlling the crosslinking density and molecular weight, a stable three-dimensional network structure is formed. Combined with the soft and hard segment microphase separation structure, self-healing and mechanical properties are improved.

Benefits of technology

It achieves multiple self-healing capabilities and stable mechanical properties of polyurethane elastomers. Through the breaking and recombination of thermally reversible bonds, it allows the material to be reshaped and recycled, thereby improving the material's service life and environmental friendliness.

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Abstract

The invention discloses polycaprolactone dihydric alcohol containing maleimide groups and a preparation method and application thereof, and the preparation method of the polycaprolactone dihydric alcohol comprises the following steps: adding N-(2, 3-dihydroxy propyl) maleimide, caprolactone and a catalyst into a reaction container, carrying out high-temperature reaction for 12-18 hours, filtering, washing, and drying to obtain the polycaprolactone dihydric alcohol containing the maleimide groups. And cooling and discharging to obtain the polycaprolactone diol containing the maleimide group. The polycaprolactone diol containing the maleimide group is used as a raw material to prepare a polyurethane prepolymer, so that the side chain of the prepolymer is provided with the maleimide group, and then a difuran compound is introduced as a dynamic cross-linking agent to obtain the self-repairing polyurethane elastomer containing the Diels-Alder bond. Through the reversible Diels-Alder (D-A) reaction effect of the functional components, the polyurethane elastomer can be remodeled and recycled, and the polyurethane elastomer has excellent and stable mechanical properties, self-repairing efficiency and repeated self-repairing capability.
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