A growing concern for environmental issues such as volatile organic solvent emissions and recycling or waste disposal problems has been observed in the development of marine paints and coatings. The environmental concern growing up, biodegradable polymers are watched with interest as self-polishing binders for chemically-active paints. In addition, the use of water in the continuous phase of paints is a way to improve the safety in application, limiting the emission of volatile organic compounds and irreversible health effects. In this paper, an innovative strategy was used to develop aqueous-based antifouling paints. Core-shell polymer nanoparticles were synthesized through the miniemulsion polymerization technique to get nanoparticles, usually under a 100 nm radius, and to limit the use of surfactants in comparison with the emulsion process. To form a void-free film, latex particles have to be soft enough so that they can deform under surface and capillary forces during the evaporation process. The core is mainly composed of hydrophobic methacrylic monomer units whereas the polymer backbone of the shell bears carboxylic acid pendant groups. The methacrylic acid (MAA) monomer unit was chosen for its hydrophilic character and enables the formation of the well-known carboxylate sodium salt moieties, which contribute to the erosion mechanism. Core-shell synthesis via a miniemulsion polymerization is an easy way to obtain binders for antifouling paints. The binder composition and morphology affect both the water uptake and the erosion profiles. The parameters that can be adjusted such as core-shell weight ratio, molar composition of the polymer chains within the core and the shell, and the molecular weights make these binders very suitable to control the erosion properties. The presence of hydrophilic polymers in the shell strongly affects the water uptake of the coating thus modifying its erosion rate. Field tests on raft show promising antifouling performance of these novel aqueous-based coatings.
Miniemulsion core-shell acrylic polymers for aqueous-based antifouling coatings
Miniemulsionsacrylpolymere mit Kern-Mantel-Struktur für wasserbasierte Unterwasserschutzanstriche
2010
10 Seiten, 8 Bilder, 18 Quellen
Conference paper
English
Miniemulsion , Acrylpolymer , Kern-Mantel-Struktur , wässriges Medium , Umweltfreundlichkeit , biologische Abbaubarkeit , Emissionsminderung , flüchtige organische Verbindung , Nanopartikel , Methacrylsäure , Monomer , Erosion , Wasseraufnahmevermögen , Polymer , Carboxylgehalt , hydrophile Eigenschaft , Wasserbasislack
Core-shell latex nanoparticles for antifouling coatings
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