Studies on Synthesis of Resol Phenol-formaldehyde Resin from Liquefied Chinese Fir Wood in Phenol

In this study,we aimed to synthesize resol phenol-formaldehyde resin from the liquefied Chinese Fir(Cunninghamia lanceolata) wood in phenol with different ratio of wood to phenol in presence of sulfuric acid as catalyst.The effects of ratio of formaldehyde to phenol(rF/P),ratio of NaOH to phenol(rNaOH/P) and resinification temperature on chemical properties of liquefied wood resins(LWR) were investigated.The resol phenol-formaldehyde adhesive could be prepared from liquefied wood(wood ∶phenol=1 ∶2) in phenol at rF/P 1.8,rNaOH/P 0.7 and resinification temperature 80 ℃.The physical properties of the poplar three-layer plywood bonded with LWR were similar to those with normal PF resins and also satisfied the demands of I level.Free formaldehyde content of plywood(0.1 mg/L) was lower than the E0 level set by GB/T 9846-2004 Plywood.