Integrated antifouling and anticorrosion fluorine-containing epoxidized soybean oil-based waterborne polyurethane coatings

Le résumé fourni par la source

Marine biofouling and corrosion present persistent challenges for marine infrastructure, while increasingly stringent environmental regulations necessitate the development of sustainable, waterborne, and bio-based protective materials. In this study, fluorine-containing waterborne polyurethane (xF-SWPU) coatings were synthesized from renewable vegetable oils, integrating antifouling and anticorrosion functionalities within a single material platform. The effects of fluorocarbon chain length on emulsion stability, film microstructure, surface characteristics, thermal stability, and protective performance were systematically evaluated. The resulting xF-SWPU films exhibited remarkable resistance to microbial and diatom adhesion, achieving a maximum antifouling efficiency of 91.49 %. This improvement arises from fluorine incorporation, which reduces surface energy and enhances hydrophobicity, thereby suppressing both initial settlement and long-term attachment of marine organisms. Moreover, electrochemical impedance spectroscopy (EIS) and polarization analyses revealed superior anticorrosion performance. Specifically, the coatings demonstrated an impedance modulus of up to 4.89 × 10 9 Ω·cm 2 , a reduction in corrosion current density by 2.73 × 10 −11 A/cm 2 . These findings demonstrate that the synergistic strategy of bio-based synthesis and fluorine modification enables the development of sustainable polyurethane coatings with dual antifouling and anticorrosion properties. Such coatings provide an eco-friendly and high-performance solution for marine engineering and shipbuilding, offering both theoretical insights and practical potential for environmentally benign protective technologies.

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