Preparation Of Phenol-Form Aldehyde Resin Adhesive With A Partial Replacement Of Phenol With Wood Tar

Bioenergy is important in green energy, paid more attention by the government and scientists. As an important way of biomass and bioenergy, the process of biomass pyrolysis is sustainable. As the by-products of biomass pyrolysis, wood tar contains kinds of inorganic, organic compounds which are harmful to the environmental, but at the same time, wood tar is a cheap and valuable chemical resources. How to utilize wood tar is the crucial problem of biomass pyrolysis.The distillates of wood tar from 150℃to 250℃were obtained by distillation method and the 37 compounds from the distillates were identified by GC/MS method in which the mass fraction of phenols compounds was above 11%.The synthesis technique for phenol-formaldehyde resin (PF) adhesive was studied by wood tar partial substitute for phenol through a one-step reaction and the sample temperature program. Orthogonal experiment was carried out with regard to the amount of wood tar substituted, reaction temperature, reaction time, and catalyst proportion. The best synthesis condition was determined and the PF adhesive achieved the demands of GB/T 14074-2006, and the bonding strength could achieve 3.08MPa.The synthesis technique of PF was studied by one step reaction and sample temperature program catalyzed by NaOH and KOH. The PF adhesive achieved the demands of GB/T 14074-2006 was obtained. The bonding strength of the PF adhesive catalyzed by NaOH could achieve 1.77MPa. The curing time also achieved the industrial demands. The bonding strength of the PF adhesive catalyzed by KOH could achieve 2.07MPa. The curing time was suitable for industries. The PF adhesives prepared by KOH showed lower viscosity, it was beneficial for storage.The PF adhesives prepared by one step reaction and sample temperature program exhibited excellent properties. The PF adhesives showed lower toxicity, lower cost and might be feasible in practical applications.