Preparation and application of green marine antifouling coating based on quaternary ammonium salt chitosan

The invention relates to preparation and application of a green marine antifouling coating based on quaternary ammonium salt chitosan, and a preparation method comprises the following steps: sequentially dipping a substrate in a quaternary ammonium salt chitosan solution and an anionic polysaccharide solution, and circularly repeating to perform layer-by-layer self-assembly and drying to obtain the green marine antifouling coating. Compared with the prior art, the chitosan quaternary ammonium salt and the polyanion polysaccharide are adopted to construct the polysaccharide polyelectrolyte multilayer film through a layer-by-layer self-assembly method, and the polysaccharide polyelectrolyte multilayer film is used as a marine antifouling coating material. The polysaccharide composite antifouling coating material shows good anti-adhesion performance in a protein solution and a chlorella suspension, has controllable degradation rate and self-polishing performance in seawater, and can be widely applied to antifoul