Antifouling and Self-Healing Performance of Marine Coatings Based on Hydrogen-Bond Interactions

Biofouling is an urgent problem that has to be solved in marine industries. As the traditional antifouling coating loses its antifouling ability after being damaged, the introduction of self-healing performance into the antifouling coating becomes a high priority. Accordingly, we report here a self-healing and antifouling polyurethane composite coating (PCL/MPU-Si/M) with the use of its carbonyl groups as multiple hydrogen bond acceptors. Its fabrication is carried out under mild and solvent-free conditions, forming a "cross-linking" network structure composed of alternately strong and weak bonds based on multiple carbonyl groups. The self-healing efficiency of PCL/MPU-Si/M in tensile strength is 85% after 48 h at room temperature, and higher temperatures can accelerate this self-healing process. Lubricant polydimethylsiloxane and antifoulant medetomidine endow the material with antifouling properties. The maximum antibacterial ability and algae inhibition coverage ability are 91.7 and 90.9%, respectively. This work provides a possible perspective for the design of antifouling and self-healing marine coatings.