High performance tannin resin-boron wood preservatives for outdoor end-uses

Published Date
February 2009, 67:89

Title 

High performance tannin resin-boron wood preservatives for outdoor end-uses

• Author 

• Marie-France Thevenon, 
• Gianluca Tondi, 
• Antonio Pizzi

Abstract

Fixation of boric acid as a low toxicity wood preservative to decrease markedly its leachability was undertaken. Preservative systems based on the cross-linking and hardening of condensed tannins by hexamine, where boric acid is complexed onto the network, were found to markedly slow down the leaching of boron. They significantly enhanced wood durability before and after leaching once tested towards basidiomycetes according to the guidelines of EN 113. A particularly virulent fungal species was used for the tests. Further immersion of the wood so treated in hot unsaturated vegetable oil does yield comparable results.

Hochwirksame Holzschutzmittel auf Tanninharz-Bor-Basis für Anwendungen im Außenbereich

Zusammenfassung

Um die Auswaschbarkeit von Borsäure als einem wenig giftigen Holzschutzmittel deutlich zu reduzieren, wurde eine Fixierung durchgeführt. Es zeigte sich, dass Holzschutzmittel, die auf Vernetzung und Aushärtung von kondensierten Tanninen mittels Hexamin basieren und deren Netzwerk mit Borsäure komplexiert wird, die Auswaschung von Bor deutlich reduzierten. Versuche mit Basidiomyceten gemäß EN 113 zeigten, dass sich die Dauerhaftigkeit von Holz vor und nach dem Auswaschen deutlich erhöht hatte. Für die Versuche wurde eine besonders stark wirkende Pilzart verwendet. Eine zusätzliche Tränkung des so behandelten Holzes in heißem, ungesättigtem Pflanzenöl verbesserte die Ergebnisse nicht.

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