EFFECT OF ULTRAVIOLET RADIATION ON THE COLOR OF FREIJÓ WOOD (Cordia goeldiana Huber) AFTER APPLICATION OF FINISHING PRODUCTS
DOI:
https://doi.org/10.5902/198050982424Keywords:
, photodegradation, species, nitrocellulose, polistenAbstract
Ultraviolet radiation is considered the most damaging radiation to wood, affecting its properties and especially its color. The application of finishing products such as varnishes, stains and inks can minimize the action of this radiation. This study aimed to evaluate the effect of ultraviolet radiation, through artificially accelerated aging, on the color of freijó wood (Cordia goeldiana Huber) treated with “polisten” and sealer (nitrocellulose), by means of spectrocolorimetric tracking. The samples of wood were subjected to cycles of ultraviolet radiation in a photochemical reactor for 84 and 168 hours. The colorimetric parameters (L*, a*, b*, C, h*) were measured before and after the treatments. The treatment with “polisten” offered greater protection against ultraviolet radiation, yielding greater stability to the parameters. The treatment with sealer led to a greater change in color after the simulation of aging in the photochemical reactor.
Downloads
References
AYADI, N. et al. Color stability of heat-treated woos during artificial weathering. Holz als Roh-und Werkstoff, Berlin, Heidelberg, v. 61, n. 3, p. 221-226, jun.2003.
CAMARGOS, J.A.A. Colorimetria quantitativa aplicada na elaboração de uma tabela de cores para madeiras tropicais. Brasília, 1999. 99 f. Dissertação (Mestrado em Ciências Florestais)- Universidade de Brasília, Brasília, 1999.
CHANG, S.-T. et al. Photodegradation and photoprotection os wood surfaces. Wood and fiber, v. 14, n. 2, p. 104-107. 1982.
CHANG, H.-T. et al. Correlation between softwood discoloration induced by accelerated lightfastness testing and by indoor exposure. Polymer Degradation and Stability. n. 72, p. 361 – 365. 2001.
FEIST, W.C. Weathering and protection of wood. In: Annual Meeting of the American Wood-Preservers’ Association, 79, 1983, Kansas City. Proceedings. p. 195-205.
GEORGE, B. et al. Photodegradation and photostabilisation of wood – the state of the art. Polymer Degradation and Stability, v. 88. p. 268-274. 2005.
HON, D. N.-S Weathering and photochemistry of wood. In: Hon, D.N.-S; Shiraishi, N. Woos and cellulosic chemistry. 2nd ed. New york: Marcel Dekker, 2001. 928 p.
MITSUI, K. et al. Low atmospheric temperature dependence on photodegradation of wood. Journal of Photochemistry and Photobiology B: Biology. v. 81, p.84-88. 2005.
NEUMANN, M. G. et al. A fotoquímica no Brasil. Quim. Nova, v. 25, p. 34-38, 2002. Supl. 1.
OLIVEIRA, F.C.C. Modelos de calibração multivariada associados à espectroscopia vibracional para análise de misturas diesel - óleos vegetais. Brasília, 2006. 98 f. Dissertação (Instituto de Química)-Universidade de Brasília, Brasília, 2006.
SILVA, J. O. et al. Fotodecomposição e proteção de madeiras tropicais. Floresta e Ambiente, Rio de Janeiro, v. 11, n. 2, p. 07 – 13. ago/dez. 2004.
SILVA, J. O. et al. Resistência ao intemperismo artificial de cinco madeiras tropicais e de dois produtos de acabamento. Ciência Florestal, Santa Maria, v. 17, n. 1, p. 17 – 23. 2007.
TEMIZ, A. et al. Surface roughness and color characteristics of wood treated with preservatives after accelerated weathering test. Applied Surface Cience, n. 205, p. 35-42. 2005.
TOLVAJ, L. Discoloration and deterioration of wood surface by ultraviolet light. In: Wood Structure and Properties’94 - The 2nd International Symposium, Zvolen – Slovakia, 1994, p.181-189.
