With the development of the modern biorefinery industry and the application of this concept in conventional biomass utilization, large amounts of biorefinery technical lignins have been generated. As phenolic polymers, lignins are considered to be potential renewable sources for industrial applications. Because of the structural similarity between lignin and phenol-formaldehyde (PF) resin, phenolic resin is an attractive area for the application of technical lignin. The final properties of the lignin-phenol-formaldehyde (LPF) resin adhesive are significantly dependent on the structural and chemical (active sites) features of the lignin. Thus, a complete characterization of the technical lignin is extremely necessary prior to the synthesis of LPF resin adhesive. In the present study, the structural features and active sites of four different biorefinery technical lignins before and after phenolation treatment under alkaline condition were determined using quantitative 2D HSQC, 13C NMR and 31P NMR spectroscopies. Four LPF resin adhesives were synthesized with a proposed formulation, which was designed based on accurate analysis of the active sites of the four lignins with 31P NMR. The properties of the LPF resin adhesives and the plywoods prepared with them were tested according to the corresponding Chinese National Standard. The structural features and curing behavior of the LPF resin adhesives, as well as a commercial phenol-formaldehyde (CPF) resin adhesive, were investigated by solution and solid state 13C NMR. The curing characteristic of the uncured LPF and CPF resin adhesives was comparatively analyzed with DSC.

Utilization of biorefinery technical lignins on lignin-phenol-formaldehyde resin adhesives

249th National Meeting (2015)

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