Improvement of self-healable automotive clearcoat using sunlight irradiation
발표자
()
초록
내용
To construct a highly efficient self-healing system under sunlight irradiation, we introduced photothermal dyes into a dynamic polymer networks. For example, a reversible polymer network-based automotive clearcoats were prepared by reacting a commercial acrylic polyol (AP)/isocyanate trimer (N3300) with a dynamic hindered urea (HU) bonds. The developed self-healing clearcoat has similar surface hardness and modulus compared to commercial ones. Diimmonium-based organic photothermal dye (DID) that absorb near-infrared light have also been added to the clearcoat system as transparent polymer heaters. The mechanical properties, transparency in the visible region, and self-healing efficiency depending on the presence or absence of dynamic HU bonding and phototermal dye content were investigated. For the polymer system containing AP/HU with 0.1 wt% DID, excellent (~100% healing efficiency) and fast (< 30 s) scratch-healing performance was observed under focused sunlight irradiation.