Fire-retardant properties of wood modified with sorbitol, citric acid and a phosphorous-based system

Author:

Kurkowiak Katarzyna1ORCID,Wu Muting1ORCID,Emmerich Lukas1ORCID,Militz Holger1

Affiliation:

1. Wood Biology and Wood Products , University of Goettingen , Buesgenweg 4 , 37077 Goettingen , Germany

Abstract

Abstract Scots pine sapwood (Pinus sylvestris L.) was modified with an aqueous solution of sorbitol and citric acid (SorCA) and a commercial phosphorus-based fire-retardant (FR). The aim of this study was to assess whether the fire behavior can be improved when the SorCA solution is supplemented by an FR and if this effect is resistant to leaching. The fire behavior of modified wood was investigated by a Bunsen burner ignition test, mass loss calorimetry (MLC) and thermogravimetric analysis (TGA). The results demonstrated a significantly improved fire-retardancy based on a decreased burning rate and a reduced mass loss in the Bunsen burner test. Also, the induced formation of a protective char barrier facilitated by the addition of a FR, reduced the heat release rate and delayed the ignition. The fire-retardant effect was still observed, to the less extent, after a cold-water (EN 84 2020) leaching of the specimens.

Publisher

Walter de Gruyter GmbH

Subject

Biomaterials

Reference23 articles.

1. Alfredsen, G., Larnøy, E., Beck, G., Biørnstad, J., Gobakken, L.R., and Treu, A. (2020). Proceedings of the 51st meeting of the international research group on wood protection, IRG/WP/20-40898, June 7-11, 2020: A summary of decay performance with citric acid and sorbitol modification.

2. Chen, C., Yao, B., Fan, W., and Liao, G. (2003). A comparative experimental study on heat release rates of charring and noncharring solid combustible materials. J. Fire Sci. 21: 369–382, https://doi.org/10.1177/0734904103036091.

3. European Committee for Standardization (2015). Plastics. Simple heat release test using a conical radiant heater and a thermopile detector, (EN ISO 13927 2015).

4. European Committee for Standardization (2017). Durability of reaction to fire performance. Classes of fire-retardant treated wood products in interior and exterior end use applications, (EN 16755 2017).

5. European Committee for Standardization (2020a). Wood preservatives. Accelerated ageing of treated wood prior to biological testing. Leaching procedure, (EN 84 2020).

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