Research On Degradable Low Surface Energy Coatings For Marine Antifouling

In the field of Marine pollution control,antifouling coatings is the most economic and effective.After organotin antifouling coatings banned,the research on developing environmentally friendly Marine antifouling coatings that are harmless,efficient and environmentally friendly is very important and extremely urgent.This project developed a degradable low surface energy coating,studied its antifouling performance,and explored its antifouling mechanism.This project developed a degradable low surface energy coating.The first one was synthesized from alcoholized lactide(PLA)and dodecafluoroheptyl methacrylate(DFHMA)with the solid super acid(SO42-/ZrO)acting as the catalyst,and the other one was a mixture of alcoholates lactide(PLA)and dodecafluoroheptyl methacrylate(DFHMA),which was used as a control group.The composition and structure of these two polyurethanes were investigated by infrared spectroscopy(FTIR)and differential scanning calorimetry(DSC).The mass loss,attachment of bacteria and algae,and the water contact angle were used to evaluate the degradable and antifouling performance of the two polyurethanes coatings.The results showed that,the maximum contact angle of PLIPFI reached 129°,its mass loss was higher than 10%in 65 days,and after 65 days,the mass loss appeared to be stable,and the antiadhesion performance of the polyurethanes coatings was also enhanced.All of these results indicated that the PU modified with a graft segment may be promising for obtaining antifouling materials that not only can resist the adhesion of microorganisms but also show self-renewal.The nano silver wire has the advantages of large specific surface area and large aspect ratio.After the end is released,a release channel is formed inside the coating layer,which can be fully released,and is expected to not change the physical strength of the coating after the release of the metallic silver.The antifouling hybrid coatings were obtained by using AgNWs and Cu2O as anti-fouling agent and PLIPFI as the film-forming polymer,and the Cu2O was added as control group.The morphology of the hybrid coatings was analyzed by SEM and CA,and the antifouling performance of the coatings was studied by laboratory evaluation and real-sea tests.The surface of the hybrid coatings prepared by adding the antifouling agent forms the lotus like micro-nano structure,which increases the roughness of the surface of the coatings,improves the hydrophobicity of the coatings,and makes the contact angle larger(131.07°).The hybrid coatings with antifouling agents exhibit excellent antifouling properties,the adhesion behaviors of Pseudomonas fluorescens,Diatoms,and Chlorella on the surface of the nano hybrid coating were studied and good effects of anti-biofouling,and the antifouling effect of the nano silver wire as an antifouling agent is superior to that of cuprous oxide,and the antibacterial effect and anti-adhesion ability of the enamel coating added with the nano silver wire are more excellent.