An online patterned light-curing self-repairing car cover film and its preparation method

Through the synergistic effect of polyurethane materials and UV curing technology with dual dynamic bonds, the problems of low efficiency, severe yellowing and high patterning cost of traditional self-repairing coatings have been solved, and a high-efficiency, low-yellowing online patterned light-curing self-repairing car cover film has been realized.

CN120535802BActive Publication Date: 2025-10-03SHANTOU WANSHUN NEW MATERIAL ZHAOFENGLIN TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202511045189.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-07-29
Publication Date
2025-10-03
Estimated Expiration
2045-07-29

AI Technical Summary

Technical Problem

Traditional thermosetting coatings have low self-repairing efficiency and require long curing time. Photocuring coatings have limited self-repairing efficiency and severe yellowing. The patterning process is costly and has limited precision. Traditional polyurethane car cover films cannot achieve high scratch resistance, high ductility and weather resistance at the same time.

Method used

By using a polyurethane material containing dual dynamic bonds, through the synergistic effect of acylhydrazone bonds and disulfide bonds, combined with UV curing technology, an online patterned light-curing self-repairing car cover film is prepared. The acylhydrazone bonds are used to quickly recombine in a slightly acidic environment, and the disulfide bonds repair scratches under thermal response, thus achieving multi-mode repair.

Benefits of technology

The self-repair efficiency is increased to 97%, the mechanical properties are enhanced (elongation at break 368%), the yellowing index is reduced (Δb=1.2), high-precision patterning and rapid curing are achieved, and high scratch resistance, high ductility and weather resistance are taken into account.

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Abstract

The present invention belongs to the technical field of self-repairing coatings, and specifically relates to an online patterned light-cured self-repairing car cover film and a preparation method thereof. The present invention discloses an online patterned light-cured self-repairing car cover film, comprising a UV curing layer and a substrate layer, wherein the components of the UV curing layer include a polyurethane containing a double dynamic bond; the polyurethane containing a double dynamic bond comprises a prepolymer obtained by a chain extension reaction with a chain extender and a cross-linking reaction with a cross-linking agent; the chain extender comprises diacetone acrylamide and bis(β-hydroxyethyl) disulfide; the cross-linking agent comprises adipic acid dihydrazide. The structure of the polyurethane containing a double dynamic bond comprises an acylhydrazone bond and a disulfide bond; the prepolymer comprises a prepolymer obtained by a prepolymerization reaction with polyether diol and isophorone diisocyanate. The double dynamic bonds of the present invention play a supramolecular synergistic effect: the acylhydrazone bond provides pH-responsive repair, and the disulfide bond is rapidly reorganized by thermal triggering, and the two synergistically achieve multi-mode repair.
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