Preparation method for ultraviolet-responsive coumarin controlled-release and self-repairing anti-fouling paint

A preparation method for an ultraviolet-responsive coumarin controlled-release and self-repairing anti-fouling paint, comprising the following steps:

• (1) taking 10 parts-50 parts by weight of a double-end-group reactive polydimethylsiloxane, 1_part-10 parts by weight of polyisocyanate, and 10 parts-100 parts by weight of an organic diluting solvent to obtain a first mixture, mixing the first mixture, and then heating the first mixture for 4 h under N2 atmosphere at 60° C.-80° C. to obtain an isocyanate-terminated prepolymer;
• (2) then adding to the first mixture 1 part-20 parts by weight of a dihydroxycoumarin compound, 0.1_parts-0.2 parts by weight of a polyol or polyamine cross-linking agent, and 0.1_parts-0.2 parts by weight of an organotin catalyst to obtain a second mixture, mixing the second mixture, and afterwards heating the second mixture for 2 h under the N2 atmosphere at 60° C.-80° C. to form a polymer solution of polyurethane;
• and
• (3) then adding to the second mixture 1 part-20 parts by weight of a coumarin compound to obtain a third mixture, mixing the third mixture, and then irradiating the third mixture for 4 h with a 365 nm ultraviolet light to obtain the ultraviolet-responsive coumarin controlled-release and self-repairing anti-fouling paint.