Abstract

SANABRIA, Ernesto Osvaldo; CAYRE, María Elisa  and  FRANK, Walter Adrián. Evaluation of three adhesives in the manufacture of Aspidosperma quebracho blanco wood blockboards stabilized with polyethylene glycol. Rev. Chapingo ser. cienc. for. ambient [online]. 2011, vol.17, n.1, pp.69-75. ISSN 2007-4018.  https://doi.org/10.5154./r.rchscfa.2010.05.030.

This study analyzed what type of adhesive is most suitable for use in the manufacture of Aspidosperma quebracho-blanco wood blockboards impregnated with polyethylene glycol (PEG). Three types of adhesives that could potentially be used to form the boards were analyzed: polyvinyl acetate (PVAc), urea-formaldehyde (UF) and phenol-formaldehyde (PF). Bond quality was determined by the glue-line strength in boards made with impregnated and non-impregnated wood. The use of PEG as a stabilizer of Aspidosperma quebracho-blanco wood did not interfere in the adhesion process when UF and PF adhesives were tested. The PVAc adhesive decreased (<15%) the resistance of the glue line in comparison with the non-impregnated wood. The adhesive that performed the best according to the Spanish standard UNE 56-777-92, pertaining to the determination of glue-line strength, was the UF one. The PVAc and PF adhesives failed to reach the minimum specifications of 10 Nmm^-2 even in those boards manufactured with non-impregnated wood.

Keywords : PEG; PVac; PF; UF.

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