J. Coat. Technol. Res. https://doi.org/10.1007/s11998-018-0086-z Photooxidative stability provided by condensed tannin additives in acrylic-based surface coatings on exterior exposure W. J. Grigsby American Coatings Association 2018 Abstract Condensed tannins, also known as proantho- Introduction cyanidins, have been added as functional additives to acrylic-based clear coatings to promote polymer coating The use of proteins and vegetable oils in coating longevity and also stabilize timber color on accelerated polymers is an example of employing renewables to and exterior weathering. When added at < 0.5% w/w improve the sustainability of the paint and coating content, native tannins and tannins modiﬁed with industry. Functional additives such as UV stabilizers, maleate groups extended coating performance > 20% wetting agents, and coalescence aids are used in compared to commercial hindered amine light stabiliz- coatings to promote the performance and longevity ers (HALS) and phenolic stabilizers used at comparable of paints and coatings with these typically derived coating loadings. Other tannin chemical modiﬁcations from petrochemical sources. Potentially, such additives such as methylcarboxylate groups were also associated could also be based on renewables and provide with greater coating longevity beyond that achieved with equivalent performance in coatings as their synthetic the synthetic UV and antioxidant additives. This
Journal of Coatings Technology and Research – Springer Journals
Published: Jun 4, 2018
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