Preservação da madeira de Eucalyptus grandis W. Hill ex Maiden com o polímero Tanfloc em ensaio de degradação com o fungo Trametes versicolor Lygis,V. et al. (2004)

Abstract

The quality of the wood for any commercial purpose depends on its anatomical, chemical and mechanical characteristics. All species have advantages and disadvantages in their structure, varying their specific mass, color, workability, natural resistance, among other aspects. Eucalyptus grandis among many species is one of the most used in forests planted in almost all Brazil, possessing high growth and quality, consequently a high market interest. Among the difficulties to cultivate and destine this wood to the final consumer can be highlighted the attacks of xylophagous, mainly fungi, in this case the white rot, which makes use of the nutritive components of the wood causing the loss of mass, consequently mechanical resistance. Therefore, treatments and methods of preserving the wood are of extreme importance. The Polymer used "Tanfloc" is an industrialized product commonly used for water treatment by large companies and countries in Europe. The work seeks to provide an increase in the resistance of the treated samples to the fungus Trametes versicolor, which causes white rot. The experimental part consisted of the impregnation of the polymer in the wood through a vacuum pump that provided a simple diffusion. After, spores of the fungus were inserted and then conducted an accelerated degradation test for the required period. Finally, the loss of mass of the specimens with and without the treatment was evaluated, evaluating the efficacy of the polymers. The obtained result showed that the Tanfloc polymer was efficient in the concentration used, and the loss of mass obtained was of 3,4% for the treated blocks and 10,43% for the untreated ones, however the mass loss did not reach the same ones Values of other authors for the untreated blocks, this may have occurred because the biodegradation test lasts for the minimum period exposed in the standard and not the 12 weeks that the other authors used. Finally it can be concluded that the polymer was statistically effective.