This paper discusses the potential use of sugarcane bagasse in two different fiber lengths (5 mm and 8 mm) of the same density as a raw material for the production of particleboards, using castor oil-based two-component polyurethane adhesive. The quality of the product that can be manufactured industrially was evaluated based on density, thickness swell (TS), absorption (WA), modulus of elasticity (MOE), modulus of rupture (MOR) in static bending and internal bond (IB), according to the Brazilian NBR 14.810:2006 standard. The results revealed a significant difference between the particleboards made with 5-mm-long fibers and those made with 8-mm-long fibers. An analysis by scanning electron microscopy (SEM) indicates that the interparticle spaces are filled with castor oil-based two-component polyurethane adhesive, contributing to improve the physicomechanical properties of the particleboards. A durability assessment based on accelerated aging tests shows that waterproofed particleboards can be used in moist environments.

O trabalho teve como objetivo desenvolver painel em madeira de reflorestamento e chapas de partículas de bagaço de cana-de-açúcar e resina poliuretana bicomponente à base de óleo de mamona, como alternativa para o sistema convencional de fechamento lateral do tronco coletivo de centro de manejo para bovinos de corte. A caracterização físico-mecânica do material forneceu um indicativo das possibilidades de uso para esse produto, que associado a pilares roliços de eucalipto compõem o sistema modular estrutural. A avaliação da resistência ao impacto do sistema modular, que procurou simular o efeito provocado pelo animal, em condições de uso, demonstrou a eficiência do modelo estrutural proposto para uso em centro de manejo.Palavras-chave: bagaço de cana, resina poliuretana, centro de manejo.

RESUMOO presente trabalho teve como objetivo desenvolver painéis de partículas aglomeradas de baixa densidade com casca de amendoim, fibra da casca do coco-verde (híbrido) e resina poliuretana bicomponente à base de óleo de mamona. Os painéis experimentais foram fabricados com partículas de até 8 mm de comprimento e 15% de resina poliuretana. A prensagem foi realizada a 5,0 MPa, por 10 minutos, a uma temperatura de 100°C. Foram determinadas as propriedades físico-mecânicas do material, seguindo as recomendações da norma ABNT 14810:2006. Os resultados demonstraram que o desempenho mecânico que atende às recomendações estabelecidas pela normativa ANSI A208.1-1999 e ABNT 14.810-2:2006. Palavras-chave: fibra de coco; casca de amendoim; resina poliuretana; painéis aglomerados. ABSTRACTThe present study aimed to develop particleboards of low density with peanut shell, coconut husk fiber green (hybrid) and two-component polyurethane resin based on castor oil. The experimental panels were manufactured with particles up to 8mm and 15% polyurethane resin. The pressing was carried out at 5.0 MPa for 10 minutes at 100°C of temperature. The physical-mechanical properties of the material were determined as recommended by ABNT 14810:2006. The results demonstrated a mechanical performance that meets the recommendations established by normative ANSI A208. 1-1999 and ABNT 14.810-2:2006.

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ABSTRACT. This work aimed at the construction and structural evaluation of modular panel with reforested wood, particleboards of sugarcane bagasse and a bi-component resin based on castor oil, for use in lateral closing for construction of crowding pens and chutes for cattle handling facilities. The quality of the particleboards was evaluated considering the requirements of NBR 14810 (ABNT, 2006) and A208.1 (ANSI, 1999). The structural performance of the modular panel was evaluated by the soft body impact testing. The results indicate that the particleboards have physical and mechanical properties that meet the minimum recommendations of the normative documents for structural use. The modular panel shows structural performance suitable to withstand impact loads equivalent to conditions of use, and can be used in cattle handling facilities.