Environmentally friendly wood preservative system based on polymerized tannin resin-boric acid for outdoor applications

Authors

  • Marie-France Thévenon Wood preservation laboratory
  • Gianluca Tondi Nancy University
  • Antonio Pizzi Nancy University

Keywords:

boric acid, tannins, hexamine, leaching, EN 113, pycnoporus sanguineus

Abstract

Boron compounds are used as wood preservatives as they are both fungicide and insecticide, relatively inexpensive and environmentally acceptable. Nevertheless, in the field of wood protection, borates are only used for indoor non-exposed applications or in association with other biocides, due to 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-formaldehyde emission polymer network. Treated mixtures were tested with different proportions of mimosa tannins and hexamine, with and without co-added boric acid. The treated beech samples were leached and tested 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 efficacy requirements of EN 113.

Thus, these associations could be envisaged to treat timber with insufficient natural durability for above ground outdoor use, and for a long service-life of the wooden commodities.

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Author Biographies

Marie-France Thévenon, Wood preservation laboratory

Wood preservation laboratory, UR40, CIRAD, TA B 40/16, 34398 Montpellier Cedex 5, France.

Gianluca Tondi, Nancy University

ENSTIB-LERMAB, Nancy University, 27 rue du Merle blanc, BP 1041, 88051 Epinal, France.

Antonio Pizzi, Nancy University

ENSTIB-LERMAB, Nancy University, 27 rue du Merle blanc, BP 1041, 88051 Epinal, France.

How to Cite

Thévenon, M.-F., Tondi, G., & Pizzi, A. (2014). Environmentally friendly wood preservative system based on polymerized tannin resin-boric acid for outdoor applications. Maderas-Cienc Tecnol, 12(3), 253–258. Retrieved from https://revistas.ubiobio.cl/index.php/MCT/article/view/1353

Issue

Section

Technical Notes

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