1. Tannin-caprolactam and Tannin-PEG formulations as outdoor wood preservatives: biological properties
- Author
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Jinbo Hu, Gianluca Tondi, Marie-France Thévenon, Sabrina Palanti, BioWooEB (UPR BioWooEB), and Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)
- Subjects
K50 - Technologie des produits forestiers ,0106 biological sciences ,Preservative ,[SDV]Life Sciences [q-bio] ,Hylotrupes bajulus ,010501 environmental sciences ,01 natural sciences ,chemistry.chemical_compound ,Condensed tannins . Caprolactam . Boron leaching . Fungal decay . Insect resistance ,Tannin ,Condensed tannins ,Food science ,fungal decay ,chemistry.chemical_classification ,Ecology ,biology ,Chemistry ,Caprolactam ,Pinus sylvestris ,Forestry ,Composition chimique ,Coniophora puteana ,boron leaching ,Proanthocyanidin ,Leaching (chemistry) ,Condensed tannins, caprolactam, boron leaching, fungal decay, insect resistance ,inorganic chemicals ,chemistry.chemical_element ,Bois ,Reticulitermes flavipes ,010608 biotechnology ,Botany ,PEG ratio ,J12 - Manutention, transport, stockage et conservation des produits forestiers ,Bore ,Boron ,Hylotrupes ,0105 earth and related environmental sciences ,technology, industry, and agriculture ,biology.organism_classification ,caprolactam ,Préservation du bois ,Résistance aux organismes nuisibles ,insect resistance - Abstract
Key Message This article presents the enhancement in boron fixation as well as the improved biological resistance against fungi and termites for wood samples treated with tannin-caprolactam and tannin-PEG formulations. Context Although the recently developed tannin-boron wood preservatives have shown high biological protection, they presented also average resistance against weathering. The tannin-caprolactam formulations have shown improved weathering resistances and dimensional stability. Aims For this reason, more detailed biological tests were performed to evaluate the influence of the caprolactam and PEG on the biological resistance. Methods In this paper, the boron leaching of the tannin-caprolactam and tannin-PEG impregnated Scots pine specimens was observed and the biocidal effect against fungi (Antrodia spp. and Coniophora puteana) and insects (Reticulitermes flavipes and Hylotrupes bajulus) were determined according to the guidelines of EN 113, EN 117, and EN 47. Results The advanced formulations containing PEG have shown interesting resistance against fungal decay, but very low penetration and weak resistance against larvae while the tannin-caprolactam preservatives have shown overall improved biological performances and higher boron fixations. Conclusion The biocidal activity of the caprolactam-added formulations was overall enhanced and therefore these formulations are confirmed to be an interesting alternative for the wood preservation in outdoor environment.
- Published
- 2017
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