TRANSFORMAÇÃO DA CASCA DE ARROZ EM UM PRODUTO DE MAIOR VALOR AGREGADO: POTENCIAL PARA A PRODUÇÃO DE PAINÉIS PARTICULADOS

Autor/innen

  • Antônia Amanda da Silva César
  • Lina Bufalino
  • Lourival Marin Mendes
  • Ricardo Gabriel de Almeida Mesquita
  • Thiago de Paula Protásio
  • Rafael Farinassi Mendes
  • Láysa Maria Ferreira Andrade

DOI:

https://doi.org/10.5902/1980509826468

Schlagworte:

Cunninghamia lanceolata, materiais lignocelulósicos, ligação interna, teor de adesivo.

Abstract

O objetivo deste trabalho foi avaliar a qualidade de painéis particulados produzidos com diferentes formulações, variando percentagens de adesivo e casca de arroz (Oryza sativa L.) adicionadas à madeira de Cunninghamia lanceolata. Três teores de adesivo (6, 9 e 12%) e três proporções de casca de arroz (25, 50 e 75%) foram combinados resultando em 9 formulações. Para analisar a influência de cada matéria-prima na qualidade final dos painéis, sua composição química foi determinada de acordo com os teores de extrativos, componentes minerais, lignina e holocelulose. Os painéis aglomerados foram avaliados de acordo com as seguintes propriedades físicas e mecânicas: absorção de água (AA), inchamento em espessura (IE), ligação interna (LI), compressão paralela (CP), módulo de elasticidade (MOE) e módulo de ruptura (MOR) na flexão estática. Os valores médios das propriedades físicas e mecânicas demonstraram que menores teores de casca de arroz e maiores teores de teor de adesivo ocasionaram melhor desempenho dos painéis. O baixo teor de lignina e alto teor de cinzas da casca de arroz influenciaram negativamente a qualidade dos painéis. Dentre as formulações avaliadas, painéis com inclusão de 25% de casca de arroz e 9% de ureia-formaldeído apresentaram os melhores resultados. Os painéis produzidos neste trabalho são alternativas potenciais para aplicações gerais em condições secas que não demandem alta resistência mecânica. No entanto, o processo e as formulações necessitam ser ajustados para aplicações estruturais mais exigentes.

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Veröffentlicht

2017-03-31

Zitationsvorschlag

César, A. A. da S., Bufalino, L., Mendes, L. M., Mesquita, R. G. de A., Protásio, T. de P., Mendes, R. F., & Andrade, L. M. F. (2017). TRANSFORMAÇÃO DA CASCA DE ARROZ EM UM PRODUTO DE MAIOR VALOR AGREGADO: POTENCIAL PARA A PRODUÇÃO DE PAINÉIS PARTICULADOS. Ciência Florestal, 27(1), 303–313. https://doi.org/10.5902/1980509826468

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