Painel estrutural de lâminas paralelas (PLP) de eucalyptus grandis utilizando adesivo resorcinólico, tanino e poliuretano derivado de óleo de mamona

Abstract

The study has as objective to evaluate and produce structural panel of laminated venner lamber of Eucalyptus grandis using resorcina-formaldehyde, tannin and castor oil-based polyurethane adhesive. The panels were assembled from 09 sheets of the same origin oriented in the same direction of its grains. The final size of each panel was nominally 20 x 480 x 480 mm (width x length x thickness), where the sheets more resistance were placed in the external layers of the panel and those of the smaller kernels. Were produced 15 panels by origin. Were employed three types of adhesive, resorcinol-formaldehyde, tannin formaldehyde and castor oil-based polyurethane adhesive, which were prepared in the following proportions: 100% resorcinol, 75% resorcinol with 25% tannin, 50% resorcinol with 50% tannin, 25 % Resorcinol with 75% tannin and 100% castor oil-based polyurethane.The panels were subjected to physical and mechanical tests in order to verify their resistance and behavior in various possible applications. The gluelines produced with the adhesives compositions already mentioned, were evaluated and compared with each other, confirming the potential of alternative adhesives in the production of wood structural panels.