Floresta e Ambiente
https://floram.org/article/doi/10.1590/2179-8087.059113
Floresta e Ambiente
Original Article Forest Products

Resistência de Painéis Aglomerados de Acacia mangium Willd. Colados com Ureia-formaldeído e Taninos a Organismos Xilófagos

Resistance of Acacia mangium Willd. Wood Particleboards Bonded with Urea-formaldehyde and Tannins to Wood-destroying Organisms

Gonçalves, Fabricio Gomes; Brocco, Victor Fassina; Paes, Juarez Benigno; Loiola, Pedro Licio; Lelis, Roberto Carlos C.

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Resumo

Objetivou-se avaliar a resistência de aglomerados confeccionados com madeira de Acacia mangium Willd. colada com adesivo à base de ureia-formaldeído e taninos a organismos xilófagos. Os painéis foram produzidos com 40 × 40 × 1,27 cm (largura × comprimento × espessura); ao adesivo, foram adicionados 10, 20 e 30% de taninos, sendo empregadas quatro razões de compactação (1,39; 1,55; 1,73 e 2,00). Nos ensaios com fungos e térmitas, utilizaram‑se amostras de 2,50 × 2,50 × 1,27 cm (largura × comprimento × espessura). Empregaram-se os fungos Gloeophyllum trabeum e Trametes versicolor (12 semanas de ensaio) e o térmita Nasutitermes sp. (45 dias de ensaio). Para o Gloeophyllum trabeum, os painéis com maior proporção de taninos e razão de compactação foram mais eficientes. Para o Trametes versicolor, não houve diferença entre os adesivos e razões de compactação utilizados. O Gloeophyllum causou maior perda de massa que o Trametes. Os térmitas consumiram completamente as amostras.

Palavras-chave

painéis reconstituídos, biodeterioração, fungos apodrecedores, térmita subterrâneo.

Abstract

This study aimed to evaluate the resistance of particleboards made of Acacia mangium Willd. wood, bonded with urea-formaldehyde and tannins as adhesive, against xylophagous organisms. Panels of 40 × 40 × 1.27 cm (width x length x thickness) were produced; 10, 20 and 30% of tannins were added to the adhesive; four compaction ratios (1.39; 1.55; 1.73 and 2.00) were employed. Samples of 2.50 × 2.50 × 1.27 cm (width x length x thickness) were used in the tests with fungi and termites. Gloeophyllum trabeum and Trametes versicolor (12 weeks) fungi and Nasutitermes sp. (45 days) termites were employed in the tests. Panels with the highest compaction ratio and proportion of tannins provided the most effective resistance to Gloeophyllum trabeum. No difference between the adhesives and compaction ratios was observed for Trametes versicolor. Gloeophyllum trabeum caused greater mass loss than Trametes versicolor. The samples were completely consumed by the termites.

Keywords

particleboard, biodeterioration, decay fungi, subterranean termite
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