Photooxidative stability provided by condensed tannin additives in acrylic-based surface coatings on exterior exposure

Photooxidative stability provided by condensed tannin additives in acrylic-based surface coatings... Condensed tannins, also known as proanthocyanidins, have been added as functional additives to acrylic-based clear coatings to promote polymer coating longevity and also stabilize timber color on accelerated and exterior weathering. When added at < 0.5% w/w content, native tannins and tannins modified with maleate groups extended coating performance > 20% compared to commercial hindered amine light stabilizers (HALS) and phenolic stabilizers used at comparable coating loadings. Other tannin chemical modifications such as methylcarboxylate groups were also associated with greater coating longevity beyond that achieved with the synthetic UV and antioxidant additives. This study has also revealed that tannin addition to acrylic coatings can act to photostabilize timber coloring on exterior exposure. While tannin use can contribute color to coatings, any color was rapidly bleached on UV exposure with a dependency on tannin content, degree of modification, and coating formulation pH. Moreover, through manipulating tannin addition levels, this tannin decolorization could offset typical wood darkening associated with UV exposure to provide low or no wood color change over longer exposure periods. With the photooxidative stability efficacy of tannins established on exterior exposure, condensed tannins in native and modified form offer potential as sustainable functional additives for the coatings sector. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Coatings Technology and Research Springer Journals

Photooxidative stability provided by condensed tannin additives in acrylic-based surface coatings on exterior exposure

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Publisher
Springer Journals
Copyright
Copyright © 2018 by American Coatings Association
Subject
Materials Science; Tribology, Corrosion and Coatings; Surfaces and Interfaces, Thin Films; Polymer Sciences; Industrial Chemistry/Chemical Engineering; Materials Science, general
ISSN
1547-0091
eISSN
1935-3804
D.O.I.
10.1007/s11998-018-0086-z
Publisher site
See Article on Publisher Site

Abstract

Condensed tannins, also known as proanthocyanidins, have been added as functional additives to acrylic-based clear coatings to promote polymer coating longevity and also stabilize timber color on accelerated and exterior weathering. When added at < 0.5% w/w content, native tannins and tannins modified with maleate groups extended coating performance > 20% compared to commercial hindered amine light stabilizers (HALS) and phenolic stabilizers used at comparable coating loadings. Other tannin chemical modifications such as methylcarboxylate groups were also associated with greater coating longevity beyond that achieved with the synthetic UV and antioxidant additives. This study has also revealed that tannin addition to acrylic coatings can act to photostabilize timber coloring on exterior exposure. While tannin use can contribute color to coatings, any color was rapidly bleached on UV exposure with a dependency on tannin content, degree of modification, and coating formulation pH. Moreover, through manipulating tannin addition levels, this tannin decolorization could offset typical wood darkening associated with UV exposure to provide low or no wood color change over longer exposure periods. With the photooxidative stability efficacy of tannins established on exterior exposure, condensed tannins in native and modified form offer potential as sustainable functional additives for the coatings sector.

Journal

Journal of Coatings Technology and ResearchSpringer Journals

Published: Jun 4, 2018

References

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