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Issue 8, 2018
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Water-borne coatings that share the mechanism of action of oil-based coatings

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Abstract

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 CO2-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 CO2 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.

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

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Publication details

The article was received on 14 Jan 2018, accepted on 21 Mar 2018 and first published on 29 Mar 2018


Article type: Paper
DOI: 10.1039/C8GC00130H
Citation: Green Chem., 2018,20, 1899-1905
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    Water-borne coatings that share the mechanism of action of oil-based coatings

    J. Ho, B. Mudraboyina, C. Spence-Elder, R. Resendes, M. F. Cunningham and P. G. Jessop, Green Chem., 2018, 20, 1899
    DOI: 10.1039/C8GC00130H

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