Application and prospect of self-healing microcapsules in surface coating of wood

Currently, the demand for valuable solid wood furniture has significantly increased. However, repeated friction can cause scratches and microcracks on its surface coating, thereby reducing its service life. Inspired by biological self-healing, shell-core structures, where the wall material provides toughness to protect the core material. When the wall material experiences external force, it cracks and releases the core material to repair microcracks. This method can prolong the life cycle of the cured paint film, enhancing its aesthetic, anti-corrosion, and protective effects on wood. In this review, we discussed the repair mechanism of self-healing microcapsules, preparation methods, and the scope of applications of the microcapsules. And the main factors affecting the performance of microcapsules were summarized. In addition, we give an overview of the application of microcapsules in wood and give an outlook on their future functional applications.