Preparation And Property Of Marine Antifouling Coating Based On Silicone-Containing Block Copolymer

Since the use of tributyltin-based antifouling coating was completely banned at2008,the low surface energy antifouling coatings with certain microtopography have aroused much more concern due to their high efficiency to inhibit the adhesion of marine organisms,energy saving and environmental protection.However,the complicated process of surface topography construction and single antifouling approach have adversely affected the antifouling efficiency,which remains to be resolved.In this paper,the active silicon-containing block copolymer was mixed with the antifoulant-loading nanoparticles and formed excellent antifouling coating with oriented nanotopography prepared by multilayer coating process via the interaction of chemical bonding and physical entanglement.Moreover,the effect of the coating approach on the performance of antifouling coating in practical application was further studied.The main research results are as follows:The active polystyrene-block-poly?dimethylsiloxane-stat-vinylmethylsiloxane??PS-b-P?DMS-stat-VMS??was prepared via active anionic polymerization of styrene,hexamethylcyclotrisiloxane and 2,4,6-trivinyl-2,4,6-trimethylcyclotrisiloxane at room temperature.The block copolymer film had narrow molecular weight distribution of1.37 and exhibited microphase separation structure.Meanwhile,the as-prepared copolymer showed excellent hydrophobicity and low surface energy of 27.31 mN/m.By using the solvothermal method,we prepared the CoFe₂O₄/gelatin nanospheres,which exhibited high crystallization and uniform size of about 80 nm.The capsaicin was firmly bonded on the CoFe2O4/gelatin nanospheres via hydrogen bonding interaction,with high loading amount of 92 mg/g and nearly no release under simulated marine environment.The capsaicin-loading CoFe2O4/gelatin nanospheres were then mixed with PS-b-P?DMS-stat-VMS?block copolymer solution and formed antifouling coating with oriented nanotopography by proper coating process.The result showed that the as-prepared antifouling coating had high drag reduction rate and could effectively inhibit the protein adsorption.Moreover,the coating exhibited low Navicula Subminuscula settlement,with 10 times less than that on the substrate and high Navicula Subminuscula removal efficiency of 36%under water flow of 50 Pa.By combining chemical bonding with physical entanglement,the antifouling coating with hierarchical microtopography was coated on the surface of steel through multi-layer coating process.The antifouling coating exhibited strong adhesion force on the substrate,low surface energy of 24.13 mN/m as well as low elastic modulus of4.97 MPa.Moreover,the antifouling coating exhibited good heat resistance property and was stable under the pH and salinity condition of seawater.The as-prepared coating exhibited efficient and endurable antifouling property,which was favorable for developing environmentally friendly and efficient marine antifouling coating.