Determinação das propriedades físicos-mecânicas de painéis de madeira compensada de pinus produzidos com resina fenólica com substituição de lignina
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Data
2023-06-20
Autores
Araujo, Camilla Kawane de Carvalho
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Universidade Estadual Paulista (Unesp)
Resumo
Os produtos engenheirados de madeira vêm sendo empregados em diferentes aplicações, desde elementos estruturais para a construção civil até a indústria de móveis e embalagens. Dentre esses produtos, pode-se destacar os painéis laminados, como o compensado que é constituído por lâminas de madeira coladas e defasadas de 90◦em relação as adjacentes. Este projeto consiste em produzir, caracterizar e avaliar as propriedades físicas e mecânicas desses painéis de madeira compensada com e sem substituição de lignina em pó associada ao adesivo fenólico. Os painéis foram produzidos com lâminas de pinus e colados com resina fenol-formaldeído comercial com substituição de lignina nas proporções de 10 e 20% em relação a massa de resina. Os ensaios físico-mecânicos foram realizados segundo as normas brasileiras da ABNT NBR para determinação da densidade, teor de umidade, inchamento em espessura, qualidade de colagem e para a determinação do módulo de elasticidade (MOE) e módulo de ruptura (MOR) à flexão estática nas direções paralela e perpendicular às fibras das lâminas externas. A partir dos resultados pode-se observar que a substituição de lignina ao adesivo, proporcionou melhor desempenho físico-mecânico ao painel, podendo destacar as propriedades físicas, visto que a análise dos mesmos quando comparados à literatura e documentos normativos, mostraram-se superiores.
Engineered wood products have been used in different applications, from structural elements for civil construction to the furniture and packaging industry. Among these products, laminated panels can be highlighted, such as plywood, which is made up of glued wooden veneers 90◦ out of phase with the adjacent ones. This project consists of producing, characterizing and evaluating the physical and mechanical properties of these plywood panels with and without replacement of powdered lignin associated with the phenolic adhesive. The panels were produced with pine blades and glued with commercial phenol-formaldehyde resin with lignin replacement in proportions of 10 and 20% in relation to resin mass. The physical-mechanical tests were carried out according to the Brazilian standards of ABNT NBR for determination of density, moisture content, swelling in thickness, bonding quality and for determination of modulus of elasticity (MOE) and modulus of rupture (MOR) to flexion static in the parallel and perpendicular directions to the fibers of the outer laminae. From the results it can be observed that the replacement of lignin to the adhesive, provided better physical-mechanical performance to the panel, being able to highlight the physical properties, since the analysis of the same when compared to the literature and normative documents, proved to be superior.
Engineered wood products have been used in different applications, from structural elements for civil construction to the furniture and packaging industry. Among these products, laminated panels can be highlighted, such as plywood, which is made up of glued wooden veneers 90◦ out of phase with the adjacent ones. This project consists of producing, characterizing and evaluating the physical and mechanical properties of these plywood panels with and without replacement of powdered lignin associated with the phenolic adhesive. The panels were produced with pine blades and glued with commercial phenol-formaldehyde resin with lignin replacement in proportions of 10 and 20% in relation to resin mass. The physical-mechanical tests were carried out according to the Brazilian standards of ABNT NBR for determination of density, moisture content, swelling in thickness, bonding quality and for determination of modulus of elasticity (MOE) and modulus of rupture (MOR) to flexion static in the parallel and perpendicular directions to the fibers of the outer laminae. From the results it can be observed that the replacement of lignin to the adhesive, provided better physical-mechanical performance to the panel, being able to highlight the physical properties, since the analysis of the same when compared to the literature and normative documents, proved to be superior.
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Compensado, Fenol-formaldeído, Lignina