Abstract
Copper-ethanolamine based wood preservatives are the most important products for protection of wood in use class III and IV applications. These preservatives can be applied using different procedures. One of them is dipping, a method which is predominantly used in less industrialised countries. The most important parameter, that influences the quality of this treatment, is dipping time. Influence of various dipping times on copper retention, adsorption, penetration, colour of the specimens and copper fixation was examined. In this paper copper-ethanolamine solutions of two different concentrations were utilised (cCu=0.05% or 0.25%). The results showed that longer dipping treatments resulted in higher uptakes of preservative solution, better penetrations and lower leaching of copper-ethanolamine based wood preservatives from Norway spruce wood. After one week of dipping, samples retained on average 275 kg/m3 of preservative solution, copper active ingredients penetrated on average 3 mm into the specimens, and only 2.3% of copper was emitted from wood impregnated with aqueous solution of the higher concentration, when subjected to ENV 1250 leaching procedure.
Zusammenfassung
Kupferethanolamin basierte Holzschutzmittel sind die wichtigsten Produkte zum Schutz von Holz in den Gebrauchsklassen III und IV. Diese Schutzmittel können mit unterschiedlichen Verfahren eingebracht werden, wie zum Beispiel dem Tauchverfahren, das überwiegend in weniger industrialisierten Ländern angewandt wird. Der wichtigste Parameter für die Imprägnierqualität ist die Eintauchdauer. Untersucht wurde der Einfluss unterschiedlicher Eintauchzeiten auf die Kupferaufnahme, die Adsorption, die Eindringung und die Farbe der Proben sowie die Kupferfixierung. In dieser Studie wurden zwei unterschiedliche Konzentrationen von Kupferethanolaminlösungen (cCu=0.05% oder 0.25%) verwendet. Die Ergebnisse zeigten, dass bei Fichtenholz eine längere Eintauchdauer eine höhere Aufnahme der Schutzmittellösung, bessere Eindringung und geringere Auswaschung von Kupferethanolamin basierten Holzschutzmitteln ergab. Nach einer einwöchigen Eintauchzeit wurden durchschnittlich 275 kg/m3 Holzschutzmittel aufgenommen, Kupferwirkstoffe drangen durchschnittlich 3 mm tief in das Holz ein und nur 2.3% Kupfer wurden bei einem Versuch nach ENV 1250 aus dem mit einer wässrigen Lösung der höheren Konzentration imprägnierten Holz ausgewaschen.
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Humar, M., Lesar, B. Influence of dipping time on uptake of preservative solution, adsorption, penetration and fixation of copper-ethanolamine based wood preservatives . Eur. J. Wood Prod. 67, 265–270 (2009). https://doi.org/10.1007/s00107-009-0317-1
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DOI: https://doi.org/10.1007/s00107-009-0317-1