Copper based wood preservative a new approach using fixation with resin acids of rosin : [Preprint]

Copper soaps with carboxylic acid groups of resin acids of rosin were shown to be potential longterm wood preservatives. The principle involved is the attachment of copper to the network formed by the inorganic part of the preservative (rosin) through the -COOH groups. The mechanisms of fixation have been studied, and it has been shown that this association could be obtained: (1) by forming the salt (a mix of rosin and NaOH where CuSO4 is added), and then impregnate (with a vacuum/pressure system) the wood with this product dissolved in ethanol, or (2) by using a double impregnation system with water solutions of the mix rosin-NaOH first, and a CuSO4 solution second, the salt being then formed within the timber. The biocidal mechanisms are based on the realease of Cu2+ by hydrolysis of the -(COO-)2Cu2+ when very humid conditions occur, this being reversible when wood moisture content is decreasing. Treated wood mini-blocks have shown good performances when leached, and biological tests assessed the good durability of such treated and leached timber.

Bibliographic Details

Main Authors:	Roussel, Camille, Haluk, Jean-Pierre, Pizzi, Antonio, Thévenon, Marie-France
Format:	conference_item biblioteca
Language:	eng
Published:	31st International Research Group on Wood Preservation Annual Meeting
Online Access:	http://agritrop.cirad.fr/539901/
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