Preparation And Properties Of Marine Antibiofouling Materials For Deformable Substrate

Marine biofouling is a sticky problem.Due to the weak adhesion and poor elasticity of traditional antifouling coatings on deformable substrate,the prevention and control of biofouling is more challenging.In this thesis,we designed and prepared a series of biodegradable polyurethane with reactive functional groups,and studied the relationship between their chemical composition,structure,adhesion and other properties.The contents are as follows:1)Silane functionalized polyurethane with polycaprolactone diol(PCL)as the soft segment has been synthesized by three different methods: post-grafting,small molecule chain extender and telomer chain extender.The polyurethane can interface with the surface of the chemically treated deformable substrate via the functional group of the side chain,thereby improving the adhesion of the polyurethane on the surface of the deformable substrate.According to the adhesion data of the coating on the surface of the deformable substrate,the best modification method was the post-grafting method.The film flexibility test showed that the coating has excellent flexibility.The adhesion after immersion in artificial seawater and bending tests showed that the coating has good stability.The plate anti-bacterial adhesion and anti-diatom adhesion experiments proved that the system incorporated with environmentally friendly antifoulant exhibited excellent anti-fouling ability.2)Epoxy functionalized polyurethane with polycaprolactone diol(PCL)as the soft segment has been synthesized by introducing epoxy groups into polyurethane via two different chain extenders of small molecule and telomer.After adding curing agent,the epoxy can interface with the surface of the chemically treated deformable substrate via the functional group of the side chain,thereby effectively improving the adhesion of the polyurethane on the surface of the deformable substrate.The adhesion data on the surface of the deformable substrate showed that introducing epoxy gruops into a small molecule chain extender was a better modification method.The adhesion after immersion in artificial sea water test showed that the coating has good stability.The plate anti-bacterial adhesion and anti-diatom adhesion experiments proved that the system incorporated with environmentally friendly antifoulant exhibited excellent anti-fouling ability.3)In order to improve its underwater adhesion,we synthesized dihydroxydopamine and introduced it as a chain extender into the polyurethane to prepare dopamine-functionalized polyurethane.The polyurethane can interface with the surface of the chemically treated deformable substrate via the dopamine side chain dopamine,thereby improving the adhesion of the polyurethane on the surface of the deformable substrate.The dry and wet adhesion datas showed that the introduction of dopamine can effectively improve the bonding strength between the polyurethane and the surface of the deformable substrate.