Abstract
Like classic wood preservatives, many water repellents have the drawback of being detrimental to the environment. Hence interest in environment-friendly, even biodegradable, substances has increased. Natural oils (e.g. tall oil, linseed oil) appear to be capable of preventing water uptake by wood. However, in order to achieve total sapwood penetration, the amount of oil needed is high. The aim of this study was to investigate the water repellent efficiency of crude tall oil and crude tall oil water emulsions (oil-in-water and water-in-oil emulsions), and the possibilities of reducing the amount of oil needed with the emulsion technique. Scots pine sapwood samples were impregnated with tall oil formulations. The levels of water absorption and the degree of water repellent efficiency were determined with cyclical wetting and drying tests. The results showed that tall oil treatments reduce the water uptake of pine sapwood. With tall oil emulsion treatments almost equal water repellent efficiencies were reached as with pure tall oil, even when the oil retentions were considerably lower. The total amount of oil required could be halved. The emulsion technique is a potential method of decreasing the amount of oil needed in order to protect wood from water uptake.
Zusammenfassung
Wie viele klassische Holzschutzmittel haben auch viele Hydrophobierungsmittel den Nachteil, dass sie umweltschädlich sind. Deshalb ist das Interesse an umweltfreundlichen, insbesondere biologisch abbaubaren, Mitteln gestiegen. Natürliche Öle (wie z.B. Tallöl, Leinöl) haben grundsätzlich eine hydrophobierende Wirkung. Um jedoch eine vollständige Imprägnierung des Splintholzes zu erreichen, ist eine grosse Ölmenge erforderlich. Ziel dieser Arbeit war es, die hydrophobierende Wirkung von Tallöl sowie von Tallöl-Wasseremulsionen (Öl-in-Wasser- und Wasser-in-Öl-Emulsionen) zu untersuchen sowie festzustellen, in welchem Umfang die benötigte Ölmenge durch das Emulgieren reduziert werden kann. Kiefernsplintholzproben wurden mit Tallölgemischen imprägniert. Der Grad der Wasseraufnahme und der Hydrophobierungsgrad wurden mittels zyklischer Befeuchtungs- und Trocknungsversuche bestimmt. Die Ergebnisse zeigten, dass eine Behandlung mit Tallöl die Wasseraufnahme von Kiefernsplintholz reduziert. Behandlungen mit Tallölemulsionen erbrachten annähernd die gleiche Wasser abweisende Wirkung wie solche mit reinem Tallöl, obwohl dabei die eingebrachte Ölmenge deutlich niedriger war. Die erforderliche Ölmenge konnte auf die Hälfte reduziert werden. Die Emulsionstechnik ist eine potenzielle Methode um die Ölmenge, die zum Feuchteschutz von Holz benötigt wird, zu reduzieren.
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Hyvönen, A., Piltonen, P. & Niinimäki, J. Tall oil/water – emulsions as water repellents for Scots pine sapwood. Holz Roh Werkst 64, 68–73 (2006). https://doi.org/10.1007/s00107-005-0040-5
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DOI: https://doi.org/10.1007/s00107-005-0040-5