Wood preservation systems including halogenated tannin extracts

Details Wood preservation systems including halogenated tannin extracts Wood preservation systems including halogenated tannin extracts

B - Operations, Transporting

27

K

B27K 3/40 (2006.01) A01N 61/00 (2006.01) B27K 3/34 (2006.01) A01N 65/00 (2006.01)

Patent

CA 2071656

The invention relates to wood preservation systems which employ impregnating agents comprising halogenated tannin extracts from plant species which are relatively more resistant to fungi, weathering, rotting, insect attack, etc. Materials contained within the tannin extracts are converted to halogenated substances which are absorbed by the wood species to be treaded. The halogenated extract materials can be used with or without other treatment agents (e.g., fixatives or metal salts). Bromine is the preferred halogen material, with optimum treatment occurring when the bromine concentration in the extract exceeds about 2% (most preferably, about 4-5%).

Systèmes de préservation du bois utilisant des agents d'imprégnation composés d'extraits de tanin halogéné provenant d'espèces végétales qui sont relativement plus résistants aux champignons, aux intempéries, à la pourriture, aux dégâts causés par les insectes, etc. Les matières contenues dans les extraits de tanin sont converties en substances halogénées qui sont absorbées par les espèces de bois devant être traitées. Les matières extraites halogénées peuvent être utilisées avec ou sans agents de traitement (par ex., des fixatifs ou des sels métalliques). Le brome est la matière halogène préférée, et on obtient un traitement optimal lorsque la concentration en brome dans l'extrait est supérieure à environ 2 % (de préférence de 4 à 5 %).

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