New kind of NIR induced self-healing composite coating

Endowing near-infrared light (NIR) induced self-healing coatings with high transparency is an interesting issue with big challenge. Herein, starting from designing an acrylate resin system and surface activated W₁₈O₄₉ nanowires (mW₁₈O₄₉), a new kind of NIR induced self-healing composite coating was developed, which is coded as ACWx (x is the loading of mW₁₈O₄₉ in each coating). The effect of mW₁₈O₄₉ loading on the integrated performance of ACWx coatings was studied.

Coatings meet the application requirements of automotive varnishes

As the content of mW₁₈O₄₉ increases, the transparency of ACWx coatings decreases, but the transmittance at 550 nm of all coatings is still >83.9 %. In addition, ACW0.5 and ACW0.65 composite coatings exhibit outstanding NIR induced self-healing ability after irradiation under NIR (power density of 2.5 W/cm2) for 3 min. Meanwhile, the integrated properties including adhesion, flexibility, hardness, gloss, acid and alkali resistance of ACWx composite coatings meet the application requirements of automotive varnishes.

The study has been published in Progress in Organic Coatings, Volume 170, September 2022.