INVESTIGATION OF PHYSICAL PROPERTIES OF PLYWOOD TREATED WITH FIRE RETARDANT CHEMICALS

Öz

The treatment with fire retardant chemicals is the most effective process to protect wood and wood based products from fire is. Therefore, use of fire retardant chemicals has been increased. However, the fire retardant chemicals have an effect on other physical, mechanical and some technological properties of the materials treated with them. In this study, it was examined that the effect of fire retardant on physical properties of plywood. Alder (Alnus glutinosa subsp. barbata ) and Scots pine (Pinus sylvestris L.) were used as wood species; zinc borate, monoammonium phosphate and ammonium sulfate were used as fire retardant chemicals and UF resin was used as adhesive. The veneer sheets were treated with immersion method. Physical properties of the plywood panels such as thickness swelling and water absorption, density and equilibrium moisture content of the panels were determined according to TS EN 317, TS EN 323-1 and TS EN 322, respectively. Thickness swelling and water absorption values of panels produced with the veneers treated with fire retardant chemicals were less than those of control panels for 2 h. However, there is no statistical difference in these results for 24 h. In addition, it was found that the density values of panels treated zinc borate was the highest in the all groups for Scots pine.

Anahtar Kelimeler

• Alder,Fire retardant,Physical properties,Scots pine

Kaynakça

1. Ayrilmis, N., Korkut. S., Tanritanir, E., Winandy, J. E. and Hiziroglu, S. (2006). Effect of various fire retardants on surface roughness of plywood. Building and Environment, 41(7), 887–892.
2. Aytaskin, A. (2009). Some technological properties of wood ımptegnated with various chemical substances, Master Thesis, Karabük University Natural Science Institute, Karabük.
3. Bohm, M., Salem. M. Z. M. and Srba, J. (2012). Formaldehyde emission monitoring from a variety of solid wood, plywood, blockboard and flooring products manufactured for building and furnishing materials. Journal of Hazardous Materials, 221-222, 68-79.
4. Cheng, R. X. and Wang, Q. W. (2011). The influence of FRW-1 fire retardant treatment on the bonding of plywood. Journal of Adhesion Science and Technology, 25, 1715–1724.
5. Demir, A. (2014). The effects of fire retardant chemicals on thermal conductivity of plywood produced from different wood species. Master Thesis, Karadeniz Technical University, Natural Science Instute, Trabzon.
6. Dundar, T., Ayrilmis, N., Candan, Z. and Sahin, H. T. (2009). Dimensional stability of fire-retardant-treated laminated veneer lumber. Forest Products Journal, 59(11), 18-23.
7. Grexa, O., Horvathova, E., Besinova, O. and Lehocky, P. (1999). Flame retardant plywood. Polymer Degradation and Stability, 64, 529–33.
8. He, X., Li, X., Zhong, Z., Yan, Y., Mou, Q., Yao, C. and Wang, C. (2014). The fabrication and properties characterization of wood-based flame retardant composites. Journal of Nanomaterials, 1-6.

9. Levan, S. L., Tran, H. C. (1990). The role of boron in flame-retardant treatments. In: Hamel M, editor. First international conference on wood protection with diffusible Preservatives. Proceedings 47355, Nashville, TN, November 28–30, p. 39–41.
10. Rosero-Alvarado, J., Hernández, R. E. and Riedl, B. (2018). Effects of fire-retardant treatment and wood grain on three-dimensional changes of sandwich panels made from bubinga decorative veneer. Wood Material Science and Engineering, 1-10. https://doi.org/10.1080/17480272.2018.1465464.
11. Tanritanir, E. and Akbulut, T. (1999). Plywood industry and general situation of plywood trade. Laminart-Furniture and Decoration Journal, 9, 122–32 (In Turkish).
12. TS EN 317, 1999. Particleboards and fibreboards- Determination of swelling in thickness after immersion in water. Turkish Standards Institute, Ankara.
13. TS EN 322, 1999. Wood-based panels-Determination of moisture content. Turkish Standards Institute, Ankara.
14. TS EN 323-1, 1999. Wood- Based panels- Determination of density. Turkish Standards Institute, Ankara.
15. White, R. H. and Mitchell, S. S. (1992). Flame retardancy of wood: present status, recent problems, and future fields. In: Lewin M, editor. Recent advances in flame retardancy of polymeric materials. Proceedings of the third annual BCC conference on flame retardance, Stamford, CT: p. 250–7.
16. Winandy, J. E. (2001). Thermal degradation of fire-retardant-treated wood: predicting residual service life. Forest Product Journal, 51(2), 47–54.
17. Yao, C. H., Wu, Y. Q. and Hu, Y. C. (2012). Flame-retardation characteristics and mechanisms of three inorganic magnesium compounds as fire-retardant for wood. Journal of Central South University of Forestry and Technology, 32(1), 18–23.