PF and UF resins are two most commonly used wood adhesives. However, their inherent defects, such as the high cost of PF resin and high formaldehyde emissions and low water resistance of UF resin, make it hard to achieve the requirements of modern wood industry with a single resin. To utilize the advantages of various resins, considerable attention has been paid to prepare a cocondensed resin. In the present study, biorefinery technical lignin, phenol, urea and formaldehyde were used to synthesize cocondensed resin in alkaline condition. The synthesis processes were tracked with liquid-state <sup>13</sup>C nuclear magnetic resonance (NMR) and matrix-assisted laser desorption/ionization time of flight mass techniques to explore the cocondensation mechanism. The linkages of the final products was also qualitatively and quantitatively analyzed using above two techniques. The solid-state NMR and differential scanning calorimetry techniques were used to investigate the curing behavior and kinetics of the cocondensed resins. The performances of the cocondensed resins were evaluated by plywood preparation experiment. Eventually, an optimal cocondensation procedure to synthesize high performance resin was proposed.

Synthesis of high performance lignin-phenol-urea-formaldehyde co-condensed resin under alkaline conditions

251st National Meeting (2016)

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