Tondi Gianluca, Wieland Stefanie, Thévenon Marie-France, Pizzi Antonio.
2011. Tannin-boron wood preservatives.
In : 1° Congresso Ibero-LatinoAmericano da Madeira na Construçao, Coimbra, Portugal, 7 a 9 de Junho de 2011
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Résumé : Tannin-boron wood preservatives are alternative products to replace water-borne formulations based on copper. Interesting results in protection against fungus (pycnoporus sanguineus) were achieved with formulations based of 20% tannin solutions containing boric acid (Thevenon et al. 2009). In this paper two upgrades are introduced: extension of preservation properties to softwood species (scots pine) and analysis of the side-properties achieved after treatment. A detailed study on tannin penetration in beech and scots pine is presented. Microscope analysis demonstrates that impregnation in scots pine have two preferential directions: Longitudinal through tracheids and radial through parenchyma rays, while in beech the liquid penetrates the wood cell mainly longitudinally through large and easy accessible vessels. Commercialization of exterior-door wood preservative will be also dependent on the side-properties derived from the treatment. For this reason, properties such as mechanical resistance and behavior against fire have been investigated. The mechanical tests have shown a strong increasing of compression resistance and surface hardness for beech and scots pine samples. The tests against fire have been monitored considering ignition, flame and ember time. A broad positive effect on fire-repellence is shown when wood is treated with tannin-boron formulations.
Mots-clés Agrovoc : acide borique, tannin, produit de préservation du bois, Fagus sylvatica, Pinus sylvestris, lutte anti-incendie, Pycnoporus
Mots-clés complémentaires : Pycnoporus sanguineus
Classification Agris : J12 - Manutention, transport, stockage et conservation des produits forestiers
K50 - Technologie des produits forestiers
Auteurs et affiliations
- Tondi Gianluca, University of Applied Science (AUT)
- Wieland Stefanie, University of Applied Science (AUT)
- Thévenon Marie-France, CIRAD-PERSYST-UPR Bois tropicaux (FRA)
- Pizzi Antonio, ENSTIB (FRA)
Autres liens de la publication
Source : Cirad - Agritrop (https://agritrop.cirad.fr/561719/)
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