Abstract
In built environments the combustibility of wood is a great concern, which limits the use of wood as a building material due to legislation. The reaction-to-fire properties of wood can be altered with the use of fire-retardant chemicals, and most of the commonly used fire retardants already have a long history of use. However, only limited information is available on the impact of different fire retardants on the adhesion properties of wood. Additionally, comparative studies between chemicals from different groups of fire retardants is scarce. The objective of this study was to investigate and compare the effects of two commonly used fire retardants, sodium silicate (SS) and diammonium phosphate (DAP), on veneer properties, the focus being especially on thermal behavior and adhesion. Thermal properties and combustibility were studied using thermogravimetric analysis (TGA), flame test and calorimetry. Glue bond strength was analyzed with an automated bonding evaluation system (ABES) and the leaching of chemicals was determined according to EN84. Additionally, the surface characteristics of modified veneers were imaged with scanning electron microscopy (SEM). Results revealed notable differences in the thermal properties of SS and DAP, with DAP having better fire-retardant performance in all thermal testing. SS also affected thermal properties and combustibility of modified veneers, but the effect was only moderate compared to DAP. Neither SS or DAP had any significant resistance against leaching but ABES testing showed a notable increase in the glue bond strength of DAP modified veneers.
Funding source: European Regional Development Fund
Award Identifier / Grant number: 18/13.01/2016
Funding statement: The authors thank for the support from Regional Council of South Savo from European Regional Development Fund (project number 18/13.01/2016), granted for the project Veneer modification, within which these results were obtained.
References
Altun, S., Ozcifci, A., Şenel, A., Baysal, E., Toker, H. (2010) Effects of silica gel on leaching resistance and thermal properties of impregnated wood. Wood Res. 55:2010–2101.Search in Google Scholar
Ayrilmis, N., Akbulut, T., Dundar, T., White, R.H., Mengeloglu, F., Buyuksari, U., Candan, Z., Avci, E. (2012) Effect of boron and phosphate compounds on physical, mechanical, and fire properties of wood-polypropylene composites. Constr. Build. Mater. 33:63–69.10.1016/j.conbuildmat.2012.01.013Search in Google Scholar
Basak, S., Samanta, K.K., Chattopadhyay, S.K., Das, S., Narkar, R., Dsouza, C., Shaikh, A.H. (2014) Flame retardant and antimicrobial jute textile using sodium metasilicate nonahydrate. Polish J. Chem. Technol. 16:106–113.10.2478/pjct-2014-0039Search in Google Scholar
Baysal, E., Sonmez, A., Colak, M., Toker, H. (2006) Amount of leachant and water absorption levels of wood treated with borates and water repellents. Bioresour. Technol. 97:2271–2279.10.1016/j.biortech.2005.10.044Search in Google Scholar
Black, J.M. (1958) The effect of fire-retardant chemicals on glues used in plywood manufacture. Forest Products Laboratory, U.S. Department of Agriculture Forest Service. Report No. 1427.Search in Google Scholar
Boonstra. M. (1997) Preservative treated wood. In: Harmonization of leaching/extraction tests. Eds. Heasman, L., van der Sloot, H.A., Quevauviller, P. Elsevier, Amsterdam, Netherlands. pp. 212–220.Search in Google Scholar
Browne, F. (1958) Theories of the combustion of wood and its control. In: U.S. Forest Service no. 2136. Forest Product Laboratory, Madison, WI. pp. 20–33.Search in Google Scholar
Di Blasi, C., Branca, C., Galgano, A. (2007) Effects of diammonium phosphate on the yields and composition of products from wood pyrolysis. Ind. Eng. Chem. Res. 46:430–438.10.1021/ie0612616Search in Google Scholar
Grancaric, A.M., Botteri, L., Alongi, J., Malucelli, G. (2015) Synergistic effects occurring between water glasses and urea/ammonium dihydrogen phosphate pair for enhancing the flame retardancy of cotton. Cellulose 22:2825–2835.10.1007/s10570-015-0671-6Search in Google Scholar
Grexa, O., Horváthová, E., Bešinová, O., Lehocký, P. (1999) Flame retardant treated plywood. Polym. Degrad. Stab. 64:529–533.10.1016/S0141-3910(98)00152-9Search in Google Scholar
Holmes, C.A. (1976) Effect of fire-retardant treatments on performance properties of wood. Abstr. Pap. Am. Chem. Soc. 172:38.10.1021/bk-1977-0043.ch006Search in Google Scholar
Jost, M., Sernek, M. (2009) Shear strength development of the phenol-formaldehyde adhesive bond during cure. Wood Sci. Technol. 43:153–166.10.1007/s00226-008-0217-2Search in Google Scholar
Kline, G.M., Reinhart, F.W., Rinker, R.C., DeLollis, N.J. (1946) Effect of catalysts and pH on strength of resin-bonded plywood. J. Res. Natl. Bur. Stand. (1934) 37:281–31.0.10.6028/jres.037.018Search in Google Scholar
Kozlowski, R., Wladyka-Przybylak, M. (2000) Natural polymers, wood and lignocellulosic materials. In: Fire retardant materials. Eds. Horrocks, A.R., Price, D. Woodhead Publishing Limited, Cambridge. pp. 293–317.10.1533/9781855737464.293Search in Google Scholar
Lebow, S.T., Winandy, J.E. (1999) Effect of fire-retardant treatment on plywood pH and the relationship of pH to strength properties. Wood Sci. Technol. 33:285–298.10.1007/s002260050116Search in Google Scholar
Lee, S.J., Thole, V. (2018) Investigation of modified water glass as adhesive for wood and particleboard: mechanical, thermal and flame retardant properties. Eur. J. Wood Wood Prod. 76:1427–1434.10.1007/s00107-018-1324-xSearch in Google Scholar
LeVan, S.L., Jerrold, E.W. (1990) Effects of fire-retardant treatments on wood strength: a review. Wood Fiber Sci. 22:113–131.Search in Google Scholar
LeVan, S.L., Kim, J.M., Nagel, R.J., Evans, Ja.W. (1996) Mechanical properties of fire-retardant-treated plywood after cyclic temperature exposure. For. Prod. J. 46:64–71.Search in Google Scholar
Lowden, L.A., Hull, T.R. (2013) Flammability behaviour of wood and a review of the methods for its reduction. Fire Sci. Rev. 2:1–9.10.1186/2193-0414-2-4Search in Google Scholar
Mai, C., Militz, H. (2004) Modification of wood with silicon compounds. Inorganic silicon compounds and sol-gel systems: a review. Wood Sci. Technol. 37:339–348.10.1007/s00226-003-0205-5Search in Google Scholar
Nguyen, T.T., Nguyen, T.V.K., Xiao, Z., Wang, F., Zheng, Z., Che, W., Xie, Y. (2019) Combustion behavior of poplar (Populus adenopoda Maxim.) and radiata pine (Pinus radiata Don.) treated with a combination of styrene-acrylic copolymer and sodium silicate. Eur. J. Wood Wood Prod. 77:439–452.10.1007/s00107-019-01401-2Search in Google Scholar
Obanda, D.N., Shupe, T.F., Barnes, H.M. (2008) Reducing leaching of boron-based wood preservatives – a review of research. Bioresour. Technol. 99:7312–7322.10.1016/j.biortech.2007.12.077Search in Google Scholar PubMed
Östman, B., Tsantaridis, L. (2016a) Durability of the reaction to fire performance for fire retardant treated (FRT) wood products in exterior applications – a ten years report. In: MATEC Web of Conferences 46.10.1051/matecconf/20164605005Search in Google Scholar
Östman, B., Tsantaridis, L. (2016b) Fire retardant treated wood products – properties and uses. In: Proceedings IRG Annual Meeting in Lisbon, Portugal. IRG Secretariat, Stockholm, Sweden. pp. 1–14.Search in Google Scholar
Östman, B., Voss, A., Hughes, A., Hovde, P.J., Grexa, O. (2001) Durability of fire retardant treated wood products at humid and exterior conditions review of literature. Fire Mater. 25:95–104.10.1002/fam.758Search in Google Scholar
Pries, M., Mai, C. (2013) Fire resistance of wood treated with a cationic silica sol. Eur. J. Wood Wood Prod. 71:237–244.10.1007/s00107-013-0674-7Search in Google Scholar
Riedl, B., He, G. (2004) Curing kinetics of phenol formaldehyde resin and wood-resin interactions in the presence of wood substrates. Wood Sci. Technol. 38:69–81.10.1007/s00226-003-0221-5Search in Google Scholar
Rohumaa, A., Hunt, C.G., Frihart, C.R., Saranpää, P., Ohlmeyer, M., Hughes, M. (2014) The influence of felling season and log-soaking temperature on the wetting and phenol formaldehyde adhesive bonding characteristics of birch veneer. Holzforschung 68:965–970.10.1515/hf-2013-0166Search in Google Scholar
Rowell, R.M., Dietenberger, M.A. (2012) Thermal properties, combustion, and fire retardancy of wood. In: Handbook of wood chemistry and wood composites. Ed. Rowell, R.M. CRC Press, Boca Raton, FL. pp. 127–150.10.1201/b12487-11Search in Google Scholar
Rowell, R.M., Susott, R.A. (1982) Bonding fire retardants to wood. Part I. Thermal behavior of chemical bonding agents. Wood Fiber 16:214–223.Search in Google Scholar
Sam Williams, R. (2010) wood_handbook_fpl_2010. Gen. Tech. Rep. FPL-GTR-190. Retrieved from https://www.fpl.fs.fed.us/documnts/fplgtr/fpl_gtr190.pdf. Accessed date: 11 February 2019.Search in Google Scholar
Selbo, M.L. (1959) Summary of information on gluing of treated wood. Forest Products Laboratory, U. S. Department of Agriculture Forest Service. Report No. 1729.Search in Google Scholar
Sernek, M. (2002) Comparative analysis of inactivated wood surfaces comparative analysis of inactivated wood surfaces. Holzforschung 58:22–31.10.1515/HF.2004.004Search in Google Scholar
Shabir Mahr, M., Hübert, T., Schartel, B., Bahr, H., Sabel, M., Militz, H. (2012) Fire retardancy effects in single and double layered sol-gel derived TiO2 and SiO2-wood composites. J. Sol-Gel Sci. Technol. 64:452–464.10.1007/s10971-012-2877-5Search in Google Scholar
Shafizadeh, F. (1984) The Chemistry of Pyrolysis and Combustion. In: The chemistry of solid wood. Ed. Rowell, R.M. American Chemical Society, Washington, DC, pp. 489–529.10.1021/ba-1984-0207.ch013Search in Google Scholar
Sharma, N.K., Verma, C.S., Chariar, V.M., Prasad, R. (2015) Eco-friendly flame-retardant treatments for cellulosic green building materials. Indoor Built Environ. 24:422–432.10.1177/1420326X13516655Search in Google Scholar
Subasri, R., Näfe, H. (2008) Phase evolution on heat treatment of sodium silicate water glass. J. Non-Cryst. Solids 354:896–900.10.1016/j.jnoncrysol.2007.08.037Search in Google Scholar
Sweet, M.S. (1993) Fire performance of wood: test methods and fire retardant treatments. In: Recent advances in flame retardancy of polymeric Materials. Ed. Zaikov, G.E. Business Communications Co., Stamford, CT. pp. 36–43.Search in Google Scholar
Terzi, E., Kartal, S.N., White, R.H., Shinoda, K., Imamura, Y. (2011) Fire performance and decay resistance of solid wood and plywood treated with quaternary ammonia compounds and common fire retardants. Eur. J. Wood Wood Prod. 69:41–51.10.1007/s00107-009-0395-0Search in Google Scholar
Tyner, H.D. (1941) Fire-extinguishing effectiveness of chemicals in water solution. Ind. Eng. Chem. 33:60–65.10.1021/ie50373a011Search in Google Scholar
White, R.H., Dietenberger, M.A. (2004) Cone calorimeter evaluation of wood products. In 15th Annual BCC Conference on Flame Retardancy. Ed. Lewin, M. Business Communications Co., Stamford, CT. pp. 331–342.Search in Google Scholar
White, R.H., Dietenberger, M.A. (2010) Fire safety of wood construction. In: Wood Handbook – Wood as an Engineering Material. Forest Products Laboratory, U.S. Department of Agriculture Forest Service, Madison, WI. pp. 410–431.Search in Google Scholar
Winandy, J.E. (2013) State of the art paper: effects of fire-retardant treatments on chemistry and engineering properties of wood. Wood Fiber Sci. 45:131–148.Search in Google Scholar
Xiao, Z., Xu, J., Mai, C., Militz, H., Wang, Q., Xie, Y. (2016) Combustion behavior of Scots pine (Pinus sylvestris L.) sapwood treated with a dispersion of aluminum oxychloride-modified silica. Holzforschung 70:1165–1173.10.1515/hf-2016-0062Search in Google Scholar
©2020 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
- Frontmatter
- Editorial
- Wood modification research in Europe
- Review
- Outlook for modified wood use and regulations in circular economy
- Original Articles
- Suitability of a lignin-derived mono-phenol mimic to replace phenol in phenol-formaldehyde resin for use in wood treatment
- Beech wood treated with polyglycerol succinate: a new effective method for its protection and stabilization
- Study on the impregnation quality of rubberwood (Hevea brasiliensis Müll. Arg.) and English oak (Quercus robur L.) sawn veneers after treatment with 1,3-dimethylol-4,5- dihydroxyethyleneurea (DMDHEU)
- The effect of diammonium phosphate and sodium silicate on the adhesion and fire properties of birch veneer
- Enhanced bonding of acetylated wood with an MUF-based adhesive and a resorcinol-formaldehyde-based primer
- Brown rot gene expression and regulation in acetylated and furfurylated wood: a complex picture
- Investigation of the effect of aging on wood hygroscopicity by 2D 1H NMR relaxometry
- Dynamic vapour sorption protocols for the quantification of accessible hydroxyl groups in wood
- A molecular model for reversible and irreversible hygroscopicity changes by thermal wood modification
- Effect of service life aspects on carbon footprint: a comparison of wood decking products
Articles in the same Issue
- Frontmatter
- Editorial
- Wood modification research in Europe
- Review
- Outlook for modified wood use and regulations in circular economy
- Original Articles
- Suitability of a lignin-derived mono-phenol mimic to replace phenol in phenol-formaldehyde resin for use in wood treatment
- Beech wood treated with polyglycerol succinate: a new effective method for its protection and stabilization
- Study on the impregnation quality of rubberwood (Hevea brasiliensis Müll. Arg.) and English oak (Quercus robur L.) sawn veneers after treatment with 1,3-dimethylol-4,5- dihydroxyethyleneurea (DMDHEU)
- The effect of diammonium phosphate and sodium silicate on the adhesion and fire properties of birch veneer
- Enhanced bonding of acetylated wood with an MUF-based adhesive and a resorcinol-formaldehyde-based primer
- Brown rot gene expression and regulation in acetylated and furfurylated wood: a complex picture
- Investigation of the effect of aging on wood hygroscopicity by 2D 1H NMR relaxometry
- Dynamic vapour sorption protocols for the quantification of accessible hydroxyl groups in wood
- A molecular model for reversible and irreversible hygroscopicity changes by thermal wood modification
- Effect of service life aspects on carbon footprint: a comparison of wood decking products