Water-borne coatings that share the mechanism of action of oil-based coatings

Because oil- or solvent-based coatings ( e.g. paints, varnishes, sealants) emit volatile organic compounds (VOCs), replacement with aqueous coating formulations is desirable. However, water-based (latex) coatings which are dispersions of polymer particles, are out-performed by solvent-based coatings...

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Veröffentlicht in:Green chemistry : an international journal and green chemistry resource : GC 2018, Vol.20 (8), p.1899-1905
Hauptverfasser: Ho, Jaddie, Mudraboyina, Bhanu, Spence-Elder, Caroline, Resendes, Rui, Cunningham, Michael F., Jessop, Philip G.
Format: Artikel
Sprache:eng
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Zusammenfassung:Because oil- or solvent-based coatings ( e.g. paints, varnishes, sealants) emit volatile organic compounds (VOCs), replacement with aqueous coating formulations is desirable. However, water-based (latex) coatings which are dispersions of polymer particles, are out-performed by solvent-based coatings in hardness, durability, gloss and cold-weather application. The challenge with latexes is that discrete polymer particles must coalesce to form a complete film, a complex process that often leads to imperfections in the coating. Proof-of-concept results show that CO 2 -responsive copolymers can form the basis of a water-borne coating in which the polymer is fully dissolved before application and yet water-resistant after application to a surface. These polymers are insoluble in neutral water, but dissolve fully in carbonated water. When a carbonated solution of polymer is cast onto a substrate, the subsequent loss of CO 2 and water by evaporation results in a clear, continuous water-resistant coating. With further development, these new coatings may retain the VOC-free advantage of water-based coatings while eliminating the need for coalescence of particles.
ISSN:1463-9262
1463-9270
DOI:10.1039/C8GC00130H