Lignin-based adhesive crosslinked by furfuryl alcohol-glyoxal and epoxy resins

In this work, a novel environmentally friendly lignin-based adhesive crosslinked with a furfuryl alcohol-glyoxal resin and epoxy resin (EPR) was used to bond particleboard. The results of C-13 nuclear magnetic resonance and matrix-assisted laser desorption-ionization time-of-flight mass spectroscopy indicated that furfuryl alcohol and glyoxal reacted under acidic conditions and that-CH-(OH)-groups may be involved in the crosslinking of the lignin-furfuryl-glyoxal resin, which also easily crosslinked with EPR. The IB strength of the particleboard bonded with LFG + 9% EPR adhesive was better than that of the particleboard bonded with lignin-furfuryl alcohol (LF) adhesive. Moreover, the modulus of elasticity of the LFG + 9% EPR adhesive was higher than that of the LF and phenol-formaldehyde adhesives.