期刊
PROGRESS IN ORGANIC COATINGS
卷 110, 期 -, 页码 55-61出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2017.03.007
关键词
Proanthocyanidins; Condensed tannins; Antioxidant; Coating additives
资金
- Biopolymer Network Ltd. - New Zealand Ministry of Business, Innovation and Employment
Being multifunctional in Manta, proanthocyanidins extractable from tree bark have been evaluated in vitro to provide a protective role to acrylic -based coating resins. These polyflavonoid compounds were assessed as radical and photo-oxidation inhibitors in both native form, and after chemical modification to provide lipophilic character and tailored antioxidant and UV absorption properties. On addition to acrylic and styrene-acrylic co-polymer coatings at typical additive levels (<0.5%) the proanthocyanidins do not inhibit coalescence and cure of the surface coating nor leach from the cured coating. Accelerated weathering and outdoor exposure of acrylic-coated timber revealed modified proanthocyanidins possessing high antioxidant activity were associated with greater coating longevity. Moreover, proanthocyanidins with a high degree of substitution also outperformed synthetic protective agents indicating the inherent UV absorption potential of these materials also contributed this efficacy within the acrylic and styrene-acrylic coating systems. Furthermore, this study has provided an unanticipated finding that the inherent UV absorption and degradation of proanthocyanidins may contribute to the photo-stabilisation and colour stability of the coated timber on weathering. (C) 2017 Elsevier B.V. All rights reserved.
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