Research On Preparation Of Amphiphilic Polmer Antifouling Coationg Based On Polycaprolactan

The adhesion of bacteria on the surface of the material poses a great hazard to human society.On the one hand,bacteria can endanger human health.For example,adsorption on the surface of medical devices and other materials can cause wound infection and bacterial invasion;On the other hand,the adsorption of bacteria on the surface of the material in the field of marine antifouling provides conditions for subsequent bioadhesion,causing a large amount of economic loss every year.The development of materials with antibacterial capabilities provides an effective solution to bacterial contamination in areas such as human health and marine antifouling.Based on the biocompatibility and degradability of polycaprolactone(PCL),an amphiphilic polymer: poly(caprolactone)-poly(dimethylaminoethyl methacrylate)(PCL-b-PDMAEMA)was designed and antifouling function convertible materials and marine antifouling coatings prepared based on the PCL-b-PDMAEMA.A solution was proposed for the two major hazards caused by the bacteria mentioned above.The hydrolyzable cationic polymer polycaprolactone-poly(N,N-dimethyl-N-(ethoxycarbonylmethyl)-N-[2'-(methacryloyloxy)ethyl]-ammonium chloride)(PCL-b-PCBMA)was prepared by quaternization of PCL-b-PDMAEMA with ethyl chloroacetate.The antibacterial coating prepared from the polymer contains a cationic poly(N,N-dimethyl-N-(ethoxycarbonylmethyl)-N-[2'-(methacryloyloxy)ethyl]-ammonium chloride)(PCBMA1)having bactericidal ability,and the PCBMA1 can be hydrolyzed into an antifouling polyester betaine(PCBMA2)in an alkaline aqueous solution.The antibacterial coating can be used to achieve the desired antibacterial effect by the conversion of the bactericidal-antifouling function of the coating.A series of self-polishing polyurethane resins were prepared by adding OS and NS to PCL-b-PDMAEMA polymer respectively to prepare a controlled release marine antifouling coating of cuprous oxide.It is believed that by PDMAEMA complexing copper ions,OS and NS can control the hydrolysis rate of the paint film to achieve controlled release of cuprous oxide while ensuring the antifouling ability of the paint.The synthesized polymer was characterized by 1H NMR method.The infrared spectrum of PCL-b-PCBMA antibacterial coating was tested and characterized by contact angle,bactericidal ability,antibacterial adsorption capacity and anti-protein adsorption capacity.The above characterization proves that the PCL-b-PCBMA antibacterial coating can perform antibacterial-antifouling function transformation and has an ideal antibacterial ability.The prepared paint film was tested for drying time,adsorption strength,seawater immersion resistance and copper ion releas e rate,and marine hanging plate experiments were carried out.Through the above experiments,it is proved that the coating has marine antifouling effect,and the hydroxy silicone oil and the amino silicone oil can effectively improve the physical properties of the paint film,and can balance the release rate of copper ions and the hydrolysis rate of the paint film.