Preparation method of intelligent coating with multistage self-repairing capability

By constructing MOF-LDH core-shell structured nanocontainers, the functional objects are released in stages, solving the problem of protection failure caused by microcracks in existing anti-corrosion coatings during service. This achieves multi-level self-repair and long-term corrosion resistance, improving the protective performance and stability of the coating.

CN121450195APending Publication Date: 2026-02-03BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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Patent Information

Application Number
CN202511880237.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-12
Publication Date
2026-02-03

AI Technical Summary

Technical Problem

Existing anti-corrosion coatings are prone to microcracks or defects during service due to mechanical scratches, thermal stress, and other factors, leading to the penetration of corrosive media. The release of traditional corrosion inhibitors is uncontrollable, and they cannot achieve multi-level self-repair. Furthermore, they affect the mechanical properties and protective stability of the coating.

Method used

MOF-LDH core-shell nanocontainers were constructed, and functional guests were loaded in situ in stages. The pH responsiveness of MOF and the corrosive ion responsiveness of LDH were utilized to achieve the graded release of functional guests, forming a multi-level self-healing coating, which ensures the long-term corrosion resistance and mechanical stability of the coating.

Benefits of technology

It achieves multi-level self-healing of coatings under repeated damage or continuous corrosion environments, improves protective performance, significantly enhances the corrosion resistance and mechanical properties of the coating, and simplifies the preparation process and reduces costs.

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Abstract

The invention belongs to the field of corrosion and protection, and discloses a preparation method of an intelligent coating with multistage self-repairing capability. According to the method, a core-shell structure nano container with a metal organic framework (MOF) compound as a core and layered double hydroxide (LDH) as a shell is prepared, different functional objects are respectively loaded in the core and the shell by adopting a step-by-step in-situ loading method, and graded release of the functional objects is realized by utilizing pH responsiveness of the MOF and corrosive ion responsiveness of the LDH; the nano container is added into an organic coating as a filler to construct an intelligent coating with multi-stage self-repairing capability. The problems of passive protection and uncontrollable corrosion inhibitor release of a traditional anti-corrosion coating are solved, the coating can repair corrosion defects in time according to needs, the long-acting corrosion resistance is remarkably improved, the preparation process is simple, the condition is mild, and the coating is suitable for metal protection of high-end equipment and other complex service environments.
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