Preparation Of Mesoporous Silica And Its Application In Fluorine/Silicone Antifouling Coatings

The fluorine-and siliaone-containing polymeric coatings with low surface energy, goodflexibility, and excellent mechanical properties can reduce the adhesion of marine biofoulingorganisms on the vessels and other undersea facilities and protect the marine ecologicalbalance. A study on these polymeric coatings has high economic value and important socialvalue. Low surface energy materials have aroused great concern due to their uniquearchitecture and properties over the last decade.In this study, fluoride-modified acrylate polymer component (FPA) was synthesized bygroup transfer radical polymerization, and silicone-modified polyurethane prepolymercomponent (SPU) was obtained by the reaction of hydroxyl-containing silicone resin matrix(-OH) with isocyanate monomer containing two or more isocyanate groups (-NCO). The FPAand SPU cured film (FPA-SPU) exhibited both the low surface energy and the strongmechanical properties of FPA and the excellent thermal oxidative stability and flexibility ofSPU. The polymers were characterized by Fourier transform infrared spectroscopy (FTIR),gel permeation chromatography (GPC) and X-ray photoelectron spectroscopy (XPS). Thecontact angle of the composite coating is up to115°, and its pencil hardness, impact strength,adhesion and chemical resistance was good and the water absorption was low.Mesoporous SBA-15was synthesized by the hydrothermal method under acidicconditions using non-ionic triblock copolymer poly (ethylene oxide)-poly (propyleneoxide)-poly (ethylene oxide)(P123) as template and tetraethoxysilane (TEOS) as the siliconsource material. SBA-15was modified by3-Aminopropyl triethoxysilane (APTES) andN-[3-(Trimethoxysilyl) propyl] ethylenediamine (AAPTS) respectively. Horseradishperoxidase (HRP) was immobilized with SBA-15, and the activity and stability greatlyimproved. All the products were characterized using small angle X-ray powder diffractionanalysis (SAXRD), N2adsorption-desorption experiments, transmission electron microscopycharacterization (TEM) and Fourier transform infrared spectroscopy (FTIR).The SBA-15was first introduced into the fluorine and silicone modified low surfaceenergy polymer by blending method. The water contact angle, chemical resistance, waterresistance, mechanical properties, thermal stability and water absorption of the SBA-15andFPA-SPU composite coating (SBA-15/FPA-SPU), with the inorganic-organic interactioninterspersed with network structure, were all improved. The results of the microbialattachment and the real sea static siding test indicate that the synthesized low surface energycoatings are superior to the commercially pure organic fluorine or silicone-based coatings,and the antifouling effect of SBA-15/FPA-SPU was better than pure FPA-SPU coating.