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Effect of an oil heat treatment on the teachability and biological resistance of boric acid impregnated wood

Impact d’un traitement oléothermique sur la durabilité du bois imprégné à l’acide borique

Annals of Forest Science volume 64, pages 673–678 (2007)Cite this article

Abstract

Vegetable oils provide boron retention of about 30% of initial amount depending on oil drying properties. Linseed oil is the most efficient, followed by soybean oil and rapeseed oil. Durability of C. japonica and F. crenata wood specimens has been enhanced by application of linseed oil alone but not enough to reduce termite’s attack of Coptotermes formosanus. Treating wood with a 1.0% w/w boric acid solution prior to oil treatment protects C. japonica from termite and fungi degradations. Efficiency against termites is mainly due to boron retention by oil but hydrophobic oil also forms a barrier decreasing fungi penetration. Boron efficacy threshold around 0.7 kg/m3BAE, lower than classical boron treatments thresholds indicates that oil water-repellence reinforces boron biostatic effect.

Résumé

La recherche en préservation du bois se tourne à présent vers des produits à faibles impacts environnementaux. Nous avons étudié l’opportunité d’associer borates et huiles végétales pour accroître la rétention du bore ainsi que la résistance du bois aux termites et aux champignons xylophages. Les huiles végétales permettent de retenir environ 30 % du bore initial selon leurs propriétés de séchage. Ainsi, l’huile de lin est plus efficace que les huiles de soja et de colza. La durabilité d’éprouvettes d’aubier de C. japonica et F. crenata est améliorée par l’ajout d’huile de lin mais trop peu pour éviter les attaques de termites Coptotermes formosanus. En revanche, la combinaison d’une imprégnation par une solution d’acide borique à 1.0 % m/m suivi d’une traitement à l’huile protège efficacement C. japonica contre les termites et les champignons. Alors que son efficacité contre les termites semble principalement due à la rétention du bore, l’huile semble former une barrière efficace contre la pénétration des champignons xylophages. Les seuils d’efficacité d’environ 0.7 kg/m3BAE, plus faible que ceux enregistrés pour les traitements classiques au bore indique que l’huile renforce l’effet biostatique du bore.

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Authors and Affiliations

  1. Laboratory of mechanics and civil engineering, University of Montpellier 2, CC 048 Pl. E. Bataillon, 34095, Montpellier Cedex 5, France

    Florent Lyon & Joseph Gril

  2. Wood preservation laboratory, CIRAD-Persyst UPR 40, TA 10/16, 34398, Montpellier Cedex 5, France

    Marie-France Thevenon

  3. Research Institute of Sustainable Humanosphere, Kyoto University, 611-0011, Kyoto, Japan

    Won-Joung Hwang & Yuji Imamura

  4. ENSTIB-LERMAB (Research and study laboratory on wood material), University of Nancy 1, 88051, Epinal Cedex 9, France

    Antonio Pizzi

Authors
  1. Florent Lyon
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  2. Marie-France Thevenon
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  3. Won-Joung Hwang
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  4. Yuji Imamura
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  5. Joseph Gril
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  6. Antonio Pizzi
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Correspondence to Florent Lyon.

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Tables I to III are only available in electronic form at http://www.afs-journal.org.

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Lyon, F., Thevenon, MF., Hwang, WJ. et al. Effect of an oil heat treatment on the teachability and biological resistance of boric acid impregnated wood. Ann. For. Sci. 64, 673–678 (2007). https://doi.org/10.1051/forest:2007046

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Annals of Forest Science

ISSN: 1297-966X