Study On The Antifouling Performance Of The Biomimetic Coating With Micro-structure Like Scarfskin Of Dolphin

Marine microbial adhesion brought about enormous harm to ships and offshore facilities.Biomimetic antifouling paint is as one of new methods to prevent the fouling due to itsnon-toxic and pollution-freecharacteristics, which is widely accepted by human. It is wellknown that dolphins live in water all day long. Nevertheless, its skin is not adhered to anyfoulings of marine. Research shows that there is a layer of unstable seta and hydrogel film onits epidermis, and provides a mechanical instability due to the sea water flow. In this thesis,some research work has been done taking ship protection coating as engineering background.Epoxy resin is used as coating substrates and three different anti-fouling coating systems areprapared, which imitate structure of dolphin skin surface wearing grume and villous. To studythe long-term life of the antifouling coating of biomimetic hydrogel surface by static soak andthe dynamic leaching behavior, using friction coefficient to detect the surface characteristicsof the hydrogel coating, Therefore, establishing the inner relationship of the properties of thehydrogel coating and antifouling performance. studied on the anti-fouling performance ofcoatings by testing the marine microalgae adhesion amount and hung board in real ocean, andunder the water environment, the biomimetic structure of the self-cleaning mechanism wasdiscussed.Firstly，the influence of hydrogel powder size and hydrogel fibers on the antifoulingperformace of the coanting are researched on. The results show that some of hydrogel-releasecoating occurs coating substrates cracking phenomenon when the static and dynamicimmersion. Further studies show that the main reason is that the size of water-absorbentpowder particle is too large or amount is too high, and its volume dramatically change duringswelling. Qunlity of15which size0.38mm, and4%the water-absorbent fibers coating canmaintain the integrity of the substrate, utilizing the sustained-release control technologies tomake water-absorbent powder fibers or fibers continue to melt, and can form a dense smoothabsorbent gel film. Especially，have the best anti-fouling properties.Secondly, using the implanting hydrogel fibers on the epoxy resin varnish to form anon-release antifouling coating, which has structure of dolphin skin surface wearing grumeand villous. The results show that the water-absorbent fibers escaping form the coating due toabsorbing the water will reduce their strength. The implantation density of7.5/mm²samples has the best anti-fouling properties, because Fibrous roots can form the layer of dense waterpiont on the surface, after absorbing water, form hydrogel film.Finally, the high strength of pure PVA and hydrophobic SiO₂modified PVA prepared fiberby frozen spinning, the fibers are implanted into the epoxy resin varnish coating. The resultsshowed that strength of the two fibers are improved. The pure PVA fibers have a betterantifouling performance than SiO₂modified PVA fibers Application of high strength PVAfiber implanted coating to resist antifouling of marine organisms has petential.The thesis found that biomimeticed the simulated sea biological metabolism of the skinmucus layer renewal capacity and micro-structure dynamic flexibility desorption will be ableto make the coatings with performance of self-cleaning, anti-fouling.