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Mimosa tannin resins for impregnated paper overlays

Abstract : The surface quality of plywood coated with resin impregnated papers based on tannin/furfuryl alcohol resins was studied. Several hardeners such as hexamine, paraformaldehyde, formurea and a mixture of formurea and paraformaldehyde were added in small quantities to a mimosa tannin/furfuryl alcohol resin. Papers impregnated with resin based on tannin + furfuryl alcohol + paraformaldehyde, or + formurea were found to yield excellent results in standard water vapour resistance and cross-cut tests. Matrix assisted laser desorption ionization time of flight (MALDI-TOF) mass spectrometry and cross-polarisation-magic angle spinning NMR (CP-MAS C-13 NMR) were used to show coreaction of tannin with furfuryl alcohol and even furfuryl alcohol self condensation under alkaline conditions, as well as coreaction of formaldehyde-yielding compounds such as hexamine with both tannin aromatic rings and the aromatic ring of furfuryl alcohol. Some of the more important oligomers formed were identified by MALDI-TOF.
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Submitted on : Tuesday, September 26, 2017 - 4:25:35 PM
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Ummi Hani Abdullah, A. Pizzi, K. Rode, L. Delmotte, X. Zhou, et al.. Mimosa tannin resins for impregnated paper overlays. European Journal of Wood and Wood Products, Springer Verlag, 2013, 71 (2), pp.153-162. ⟨10.1007/s00107-012-0652-5⟩. ⟨hal-01593760⟩



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