Process for the production of bio-based formaldehyde-free wood adhesives from lignocellulosic biomass

Abstract

The present disclosure provides a process for the synthesis of bio-based formaldehyde-free wood adhesive with lignin and cellulose derived bio-oil which can be generated from the fractionation/liquefaction of lignocellulose biomass such as agricultural and forestry wastes. Curable groups are introduced onto the bio oil through functionalization reaction with cyclic anhydrides such as maleic anhydride, citric anhydride, phthalic anhydride, succinic anhydride, methyl succinic anhydride. Wood adhesives are formulated with the functionalized bio oil by addition of water and curing agents. Two-ply plywood samples were prepared following the ASTM International Standard 2017, D2339-98 and cured on a hot press between 190-200° C. for 3-4 min under 3 MPa pressure. The plywood samples have dry and wet strengths in the range of up to 3.5 MPa with over 80% wood failure.

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