ENVIRONMENTALLY FRIENDLY WOOD PRESERVATIVE SYSTEM BASED ON POLYMERIZED TANNIN RESIN-BORIC ACID FOR OUTDOOR APPLICATIONS

Marie-France Thévenon, Gianluca Tondi, Antonio Pizzi

Abstract


for indoor non-exposed applications or in association with other biocides, dueto their main disadvantage of being readily leachable from treated wood. To overcome this problem,boric acid was fixed into wood with condensed tannins and hexamine through a non-formaldehydeemission polymer network. Treated mixtures were tested with different proportions of mimosa tanninsand hexamine, with and without co-added boric acid. The treated beech samples were leached andtested according to European Standard EN 113 against Pycnoporus sanguineus in tropical conditions.The systems had minimal boron depletion and good fungal decay efficacy, meeting the efficacyrequirements of EN 113.Thus, these associations could be envisaged to treat timber with insufficient natural durabilityfor above ground outdoor use, and for a long service-life of the wooden commodities.

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