A car paint protective film with scratch self-repairing function and a preparation method thereof

By modifying nano-cerium dioxide with polyethyleneimine grafting and through the synergistic effect of amino-containing hyperbranched polysiloxane and epoxy-terminated self-healing polyurethane, a dynamic hydrogen bond and disulfide bond synergistic self-healing network was constructed, which solved the problem of failure of self-healing active sites of polyurethane protective film under ultraviolet irradiation, and achieved efficient and stable self-healing and ultraviolet protection.

CN122325966APending Publication Date: 2026-07-03GUANGDONG MOFFA SMART OPTICAL MATERIALS CO LTD
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Patent Information

Application Number
CN202610720716.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-25
Publication Date
2026-07-03

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Abstract

The application discloses a car paint protective film with scratch self-repairing function and a preparation method thereof, and belongs to the technical field of car paint protective films. Firstly, nano cerium dioxide is modified by epoxy silane and grafted with polyethylene imine to obtain polyethylene imine grafted nano cerium dioxide, and amino-containing hyperbranched polysiloxane is prepared by taking 1,6-hexanediol and gamma-aminopropyl triethoxysilane as raw materials; then, epoxy-terminated self-repairing polyurethane is obtained by taking polycarbonate diol as a soft segment, isophorone diisocyanate as a hard segment, adding bis(4-hydroxyphenyl) disulfide for chain extension and then performing epoxy propanol end-capping treatment; finally, the polyethylene imine grafted nano cerium dioxide, the amino-containing hyperbranched polysiloxane and the epoxy-terminated self-repairing polyurethane are compounded and cured to construct a synergistic system of ultraviolet blocking, dynamic self-repairing and interface enhancement, so that the material has good self-repairing ability and ultraviolet resistance, and meets the use requirement of long-acting protection of a car paint surface.
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Citation Information

Patent Citations

  • Scratch-resistant polyurethane paint surface protective film and preparation method thereof

    CN118652622A