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Evaluation of the photo stabilising efficiency of clear coatings comprising organic UV absorbers and mineral UV screeners on wood surfaces

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Abstract

A study of the surface discolouration of clear coated wood during artificial and outdoor weathering and its prevention using clear coatings comprising organic UV absorbers (UVA) and mineral UV screeners was carried out. It was shown that the use of UVA and UV screeners in clear coatings was very effective in reducing photodegradation of the wood surface. Preliminary irradiation trials with Xenon arc light showed that the UV screener TiO2 led to the least discolouration of the coated wood surface, closely followed by UVA of the hydroxyphenyl-s-triazine class (HPT). The artificial and outdoor weathering trials indicated that UVA of the HPT class stabilised the colour of the wood surface better than UVA of the 2-(2-hydroxyphenyl)-benzotriazole class (BTZ). Comparison of different artificial weathering methods indicated that Xenon arc light weathering showed the best match to the proceeding discolouration of the clear coated wood panels during outdoor weathering.

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Acknowledgments

The results presented in this paper are part of the research project ‘Brightwood’ of the Competence Centre Wood Technology. Financial support by the Austrian Ministry of Economics and Labour (BMWA), the Austrian Association of Wood Industries, the Österreichische Bundesforste AG (öbf) and the companies Adler-Werk Lackfabrik, Akzo Nobel Deco GmbH, Avenarius Agro GmbH, BASF SE, Collano AG, Holz Leeb GmbH, Isocell Vertriebsges.m.b.H., Nanosys GmbH and Remmers Baustofftechnik GmbH is gratefully acknowledged.

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Authors and Affiliations

  1. Holzforschung Austria, 1030, Vienna, Austria

    Boris Forsthuber & Gerhard Grüll

  2. BASF SE, 67056, Ludwigshafen, Germany

    Christian Schaller

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  1. Boris Forsthuber
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  2. Christian Schaller
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  3. Gerhard Grüll
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Correspondence to Boris Forsthuber.

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Forsthuber, B., Schaller, C. & Grüll, G. Evaluation of the photo stabilising efficiency of clear coatings comprising organic UV absorbers and mineral UV screeners on wood surfaces. Wood Sci Technol 47, 281–297 (2013). https://doi.org/10.1007/s00226-012-0487-6

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  • DOI: https://doi.org/10.1007/s00226-012-0487-6

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