Heat treatment of wood in dry medium and investigation on its effect on surface wettability and adhesion strength of coating | ||
| تحقیقات علوم چوب و کاغذ ایران | ||
| Article 15, Volume 31, Summer 2 - Serial Number 55, May 2016, Pages 362-373 PDF (292.79 K) | ||
| Document Type: Research Paper | ||
| DOI: 10.22092/ijwpr.2016.105776 | ||
| Author | ||
| Mohammad Ghofrani* | ||
| Abstract | ||
| In this study, the effect of heat treatment of Alder (Alnus glutinosa), Poplar (Populus nigra) and Spruce (Picea abies) on adhesion strength of clear and acid catalyzed transparent coating was investigated. For this aim, wooden samples were prepared with dimension of 200×100×18 mm (longitudinal, tangential, radial) from sapwood on tangential surface. Samples were kept under heat treatment in oven with 150 and 180˚C temperatures for about 3 hours. After treatment, samples’ surfaces were sanded with 120 and 180 grit size sand paper, respectively. Contact angle of water was measured before and after treatment. Samples’ surfaces were covered with a transparent coat in two separate processes which were clear and acid catalyzed. Adhesion strength of coating measured with Pull Off method according to ASTM D-4541 standards. Results showed that the heat treatment increased contact angle. This increase continues as the heat treatment temperature goes higher and it leads to decrease in wettability of samples’ surfaces. Results also indicated that heat treated of wood had significant effect on adhesion strength of coating. Adhesion strength in control samples was more than heat treated samples. lowest coating strength was observed in samples which were heat treated in 180 ˚C. | ||
| Keywords | ||
| heat treatment; Dry medium; Surface Wettability; Adhesion strength of coating; Wood species; Transparent coat | ||
| References | ||
|
Boonstra, M.J., Tjeerdsma, B.F. and Groeneveld, H.A.C., 1998. Thermal modification of non-durable wood species. 1. The Plato Technology: Thermal modification of wood. The International Research Group on Wood Preservation, IRG Document No. IRG/WP98-40123
-Candan, Z., Buyuksarı, U., Korkut, S., Unsal, O. and Cakıcıer, N., 2012. Wettability and surface roughness of thermally modified plywood panels. Industrial Crops and Products, 36(1): 434-436.
-Cristea, M.V., Riedl, B. and Blanchet, P., 2011. Effect of addition of nanosized UV absorbers on the physico-mechanical and thermal properties of an exterior waterborne stain for wood. Progress in Organic Coatings, 72(4): 755-762.
-Dahmardeh-Ghalehno, M. and Nazerian, M., 2011. Changes in the Physical and Mechanical Properties of Iranian Hornbeam Wood (carpinus betulus) with Heat Treatment. Europ. J. Sci. Res, 51(4): 490-498.
-Enayati, A.A. 2010. Wood Physics. Tehran University Press, Tehran.
-Ghofrani, M. and Khojasteh Khosro, S., 2014. The effect of wood surface finishing quality on the adhesion strength of clear coat. J. Color. Sci, (7): 339-345.
-Hakkou, M., Petrissans, M., Zoulalin, A. and Gerardin, P., 2005. Investigation of wood wettability changes during heat treatment on the basis of chemical analysis. Polymer Degradation and Stability, 89: 1-5.
-Hatefnia, H., Enayati, A., Doost Hoseini, K. and Azad Fallah, M., 2012. Effect of steam treatment on chemical changes of wood components. Iranian Journal of Wood and Paper Science Research, 26(4): 682-698.
-Jahan Latibari, A. 2007. Science and technology of adhesion for lignocellulosic substances. Daneshgahe azad eslami, Karaj.
-Jimenez, J.P.Jr., Acda, M.N., Razal, R.A. and Madamba, P.S., 2011. Physico-Mechanical properties and durability of thermally modified malapapaya [polyscias nodosa (blume) seem. wood. Philippine J. Sci, 140(1): 13-23.
-Khojasteh Khosro, S., 2014. Investigation on the effect of nano Zinc Oxide on physical properties of polyurethane clear coat in wooden furniture surfaces, degree of M.Sc, Shahid Rajaee Teacher Training University, Iran.
-Manavi, Gh., Ghofrani, M. and Mirshokraei, S.A., 2012. Effects of wood type, moisture content and paint type on adhesion strength of conventional clear paints used in furniture manufacture. Iranian Journal of Wood and Paper Science Research, 27: 743-753.
-Mirzaei, Gh., Mohebby, B. and Tabarsa, T., 2012. Collapsibility and Wettability of Hydrothermally Treated Wood. Iranian Journal of Wood and Paper Industries, 3: 1-11.
-Petrissans, M., Gerardin, P. and Serraj, M., 2003. Wettability of heat-treated wood. Holzforschung, 57(3): 301-307.
-Salim, R., Ashaari, Z. and Samsi, H.W., 2010. Effect of Oil Heat Treatment on Physical properties of Semantan Bamboo (Gigantochloa scortechinii Gamble). Modern Applied Science, 4(2): 107-113.
-Sjostrom, E. 1993. Wood Chemistry Fundamentals and Applications; Academic Press: San Diego.
-Sonmez, A., Budakci, M. and Bayram, M., 2009. Effect of wood moisture content on adhesion of varnish coatings. Scientific Research and Essay, 4(12): 1432-1437.
-Tanaomi, A.R., Mohebby, B. and Ghahri, S., 2012. The Effect of Oleothermal Treatment on Physical and Mechanical Properties of Beech Wood. Journal of Wood & Forest Science and Technology, 19(3): 111-126.
-Tjeerdsma, B.F. and Militz H., 2006. Chemical changes in hydrothermal treated wood: FTIR analysis of combined hydrothermal and dry heat-treated wood, Holzals Roh- und werkst off, 63:102-111.
-Tjeerdsma, B.F., Stevens, M. and Militz, H., 2000. Durability of (hydro) thermal treated wood. The International Research Group on Wood Preservation, IRG Document No. IRG/WP 00-40160 | ||
|
Statistics Article View: 1,590 PDF Download: 1,837 |
||
Journal management system. designed by sinaweb