Near-infrared light induced self-healing W18O49/acrylate resin composite coatings with high transparency

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 W 18 O 49 nanowires (mW 18 O 49 ), a new kind of NIR induced self-healing composite coating was developed, which is coded as ACWx (x is the loading of mW 18 O 49 in each coating). The effect of mW 18 O 49 loading on the integrated performance of ACWx coatings was studied. As the content of mW 18 O 49 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/cm 2 ) 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.