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Colour stabilisation of wood composites using polyethylene glycol and melamine resin

Farbstabilisierung von Holzkompositen durch Polyethylenglykol und Melaminharz

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Abstract

Photo-yellowing of native and polyethylene glycol (PEG) modified wood and wood/melamine resin composites was studied by means of FTIR-ATR technique and colourimetry (CIE L*a*b* method). The discolouration \( \mathrm{\Delta } \)E shows a systematic asymptotic trend towards higher values with increasing irradiation time. Yellowing proceeds faster in natural wood compared to wood/melamine resin composites. Nevertheless, long-term irradiation experiments show that the total colour shift is similar for both.

Discolouration is significantly reduced by PEG treatment. In comparison to untreated wood, both glycol and melamine resin mainly reduce the irradiation-induced yellow shift. Moreover, PEG also shows an effect on the redness shift. Both effects result in decreased yellowing of the composite surface. An influence of the molecular weight of PEG was detected.

Zusammenfassung

Die Photovergilbung von unbehandeltem und Polyethylenglykol (PEG) behandeltem Holz bzw. Holz/Melaminharz-Kompositen wurde mit Hilfe der FTIR-ATR-Technik und Colorimetrie (CIE L*a*b* Methode) untersucht. Die Verfärbung \( \mathrm{\Delta } \)E zeigt dabei einen systematischen, asymptotischen Trend zu größeren Werten mit steigender Bestrahlungszeit. Die Vergilbung verläuft dabei im natürlichen Holz schneller als in den Holz/Melaminharz-Kompositen. Die maximale Farbveränderung ist in beiden Systemen jedoch letztendlich gleich.

Die Verfärbung wird durch PEG-Modifizierung signifikant reduziert. Im Vergleich zum unbehandelten Holz wird durch die Glykol-Modifizierung wie in den Holz/Melaminharz-Kompositen hauptsächlich die Gelbverschiebung reduziert. Zusätzlich zeigt PEG noch einen Effekt auf die Rotverschiebung. Beide Effekte münden in einer verringerten Vergilbung der Kompositoberfläche. Weiterhin wurde ein Einfluss der Molmasse des PEG auf diesen Effekt festgestellt.

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Acknowledgements

The authors gratefully acknowledge the support of the Competence Centre for Wood Composites and Wood Chemistry (Wood  K plus), funded by the Austrian Federal Government and the provincial governments of Upper Austria, Lower Austria and Carinthia. Special thanks are due to AMI Agrolinz Melamine International GmbH for providing and improving the new melamine resins.

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  1. Kompetenzzentrum Holz GmbH (Wood K plus), St.-Peter-Straße 25, 4021, Linz, Austria

    Uwe Müller & Melanie Steiner

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  1. Uwe Müller
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Correspondence to Uwe Müller.

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Müller, U., Steiner, M. Colour stabilisation of wood composites using polyethylene glycol and melamine resin. Eur. J. Wood Prod. 68, 435–443 (2010). https://doi.org/10.1007/s00107-009-0386-1

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