Preparation Of The Biomimetic Hydrogel Coatings And Study Of The Antifouling Performance

Marine biofouling have a harmful effection on the safety and operation of ships and offshore facilities. With the improvement of environmental requirements, developing non-toxic,green antifouling technology has become a research hotspot. Many investigations indicate that the skin of large marine biological has anti-fouling functions. Bionic anti-fouling as a new friendly antifouling methods gets attention widely. Hydrogel has special characters such as high water content, lubrication and low elastic modulus. Due of the special characters of hydrogel, in this paper, we prepared different coating system to simulate antifouling functions of marine organisms epidermal mucus We prepared the releasing coating by mixed sodium polyacrylate (PAAS) and PVA hydrogel to simulate the regeneration features of large sea creatures skin mucus layer. A micro-nano hierarchical structure hydrogel coating was prepared, and discussed the inner link between the microstructure and the coating. The self-clean antifouling mechanism of micro-nano hierarchical structure coating were studied.The regulation of Cu2+ release in biocide antifouling coatings and its impact on the anti-adherent performance of the coating were investigated.The results show that the surface can form a dense continuous hydrogel film and can be maintained long-term immersion integrity without cracking phenomenon in the water, when the adding content of PAAS powder is 10%. The self-healing and self-regeneration effect of the PAAS-release hydrogel coating was obviously. In the flow of water, it presented significant self-cleaning ability and anti-adhesion properties.the micro-nano hierarchical structure hydrogel coating was established by carbon nanotubes (CNT) and PVA composite hydrogel. The mechanism of anti-fouling coatings could be interpreted as that synergic effect of micro-nano hierarchical structure and hydrophilic properties of coating surface on self-cleaning capability improved antifouling performance of coating surface.The Cu2O/PVA composite hydrogel was established. The results show that high content of Cu2O powder in PVA results in the PVA porous structure filling in, Cu2+ can not be diffused into the water.When the content of Cu2O particles is 5% in the Cu2O/PVA composite hydrogel, it has the highest rate release of Cu2+.