Effect of hardening parameters of wood preservatives based on tannin copolymers
| Autor: | Alexander Petutschnigg, Gianluca Tondi, Lukas Sommerauer, Marie-France Thévenon |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
K50 - Technologie des produits forestiers
Preservative Biocide Tannin Formaldehyde Weathering Water-proof Modification White rot decay Furfural Green products complex mixtures Durability Furfuryl alcohol Polymère Biomaterials chemistry.chemical_compound pourriture blanche Biomimicry Acacia mimosa Hardening Multivariate data analysis Natural copolymers Produit de préservation du bois chemistry.chemical_classification Chemistry technology industry and agriculture Maleic anhydride Pulp and paper industry Préservation du bois Durcissement |
| Zdroj: | Holzforschung |
| Popis: | Amongst polyphenols, tannins belong to the most effective chemical protection systems against biological attack on trees. Tannins are water-soluble and are thus leached out easily when used for wood protection. In situ polymerized tannin-hexamine wood preservatives have better leaching resistance (LR), but they do not resist weathering. In this study, tannin copolymer formulations were prepared with hexamine, formaldehyde, furfural, glyoxal, furfuryl alcohol and maleic anhydride, impregnated in wood, and cured at higher temperatures. The wood samples treated with these formulations were tested for their anti-swelling efficiency (ASE), leaching behavior, mechanical properties, and their resistance against fire, weathering and biological attack. Several tannin-treated specimens showed improved hardness and enhanced leaching and fire resistance. Some formulations also responded well to artificial weathering cycles, but natural weathering cycles deteriorated their performance. Samples treated with maleic anhydride showed improved leachability and high biological resistances, even without the addition of inorganic biocides. These organic and bio-friendly products can be considered as promising alternatives to heavy metal-based wood preservatives. |
| Databáze: | OpenAIRE |
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