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Open AccessArticle

Comparison of Exterior Coatings Applied to Oak Wood as a Function of Natural and Artificial Weathering Exposure

1
Department of Wood Processing and Biomaterials, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences in Prague, Kamýcká 129, 165 00 Prague, Czech Republic
2
Department of Natural Resource Ecology and Management, Oklahoma State University, 303-G Agricultural Hall, Stillwater, OK 74078, USA
*
Author to whom correspondence should be addressed.
Coatings 2019, 9(12), 864; https://doi.org/10.3390/coatings9120864
Received: 13 November 2019 / Revised: 2 December 2019 / Accepted: 14 December 2019 / Published: 16 December 2019
(This article belongs to the Special Issue Advances in Surface Modification and Treatment of Wood)
Artificial weathering can significantly reduce the testing time needed for proving coating durability, nevertheless its reliability is still not thoroughly proven. In this study, eight different transparent and pigmented coating systems, namely oil, acrylate, alkyd and urethane alkyd were evaluated through natural and artificial weathering tests on oak samples by measuring colour, gloss and surface wettability and by macroscopic and microscopic evaluation. The oil coatings performed well in wood colour stability evaluations, while the best gloss and wettability change results were noted for acrylate coatings. Pigmented coatings were characterized by significantly lower colour changes than transparent ones. The gloss and wettability changes were more sensitive to coating disruption than to total colour changes of coated wood associated with chemical changes in wood. The findings in this work showed that values of gloss changes and surface wettability for all types of coatings exposed to artificial and natural weathering resulted in significant differences from each other. The data obtained by artificial weathering method provide basic results of coatings durability and, ideally, natural weathering should be performed at the same time to support the results from laboratory tests by exposing wood under real conditions. View Full-Text
Keywords: artificial weathering; coatings; durability; natural weathering; oak wood artificial weathering; coatings; durability; natural weathering; oak wood
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MDPI and ACS Style

Oberhofnerová, E.; Šimůnková, K.; Dvořák, O.; Štěrbová, I.; Hiziroglu, S.; Šedivka, P.; Pánek, M. Comparison of Exterior Coatings Applied to Oak Wood as a Function of Natural and Artificial Weathering Exposure. Coatings 2019, 9, 864.

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