Research Of Self-healing And Antifouling Epoxy Resin Based Coating Composed With Dual Microcapsules And Fluorinated Polymer

The ship will inevitably cause damage in the course of navigation along with the external force attack?such as impact or natural degradation?.The production of microcracks will cause the decrease of the material mechanical properties,so the life-span of material is limited.In addition,the marine surface protective coating is also facing another problem,which is the attachment of organic molecules?proteins?on the underwater environment,which not only reduces the speed of navigation,increases fuel consumption,but also increases the maintenance cost of the ship.In order to solve the above problem,self-healing technology was introduced into antifouling coating.The epoxy microcapsules?ER-MCs?and underwater epoxy hardener microcapsules?UEH MCs?were prepared,and the two microcapsules were embedded in epoxy resin system.Then the surface of epoxy resin system was modified by the prepared fluorinated antifouling polymer.A dual-functional coating with self-healing and antibiofouling properties were obtained.The poly?urea-formaldehyde?shell containing epoxy resin E44 and diluent BGE microcapsules?ER-MCs?were prepared by in situ emulsion polymerization,and the polymethyl methacrylate shell containing underwater epoxy hardener microcapsules were prepared by solvent evaporation technique,respectively.The surface morphology of dual microcapsules and rupture microcapsules were characterized by field emission scanning electron microscopy?SEM?.The core-shell structure and dispersed spherical structure of the dual microcapsules were proved.The ER-MCs surface had a convex rough structure,while the UEH MCs had a concave honeycomb structure.The chemical structure and stability of dual microcapsules were characterized by infrared spectroscopy?FT-IR?and thermogravimetry?TGA?,respectively,indicating that the microcapsules were prepared successfully and the high thermal stability.ER-MCs and UEH-MCs were embedded in epoxy resin system and coated on the surface of E235iron sheet to form epoxy resin coating?Dual-MCs/ER?.The results showed that Dual-MCs/ER had better self-healing function.In addition,the fluorinated polymer(PFG_X/Y)were synthesized with monomer hexafluorobutyl methacrylate?HFBM?and glycidyl methacrylate?GMA?by traditionalradical polymerization?X/Y indicates the mass ratio of monomer HFBM to monomer GMA?.The PFG was characterized by FT-IR and ¹HNMR,which proved that the polymer PFG was successfully synthesized.Through the ring opening reaction,the fluorinated polymer PFG was grafting to the surface of the Dual-MCs/ER to obtain the PFG/Dual-MCs/ER coating.The SEM result confirmed that the surface of the grafted coating had a rough structure of protruding.WCA measurements showed that the surface hydrophobic were extremely increased after modified.The results of self-healing and bovine serum albumin protein?BSA?adsorption experiments showed that the composite coatings not only had better underwater self-healing ability,but also exhibited good anti-protein adhesion properties,in which PFG_18/4/Dual-MCs/ER had the best anti-protein adhesion property.