NaOH and Ba(OH)2 Compound Catalyzed Phenol-Resorcinol-Formaldehyde Copolycondensation Resin Adhesive for Recombined Bamboo

In order to reduce the curing temperature, shorten the curing time of phenol- formaldehyde (PF) resin adhesive, and ensure the good water-solubility, NaOH and Ba(OH)2 were used as compound catalysts. The influences of the adding time of Ba(OH)2, the adding amount of NaOH, Ba(OH)2 and resorcinol on the properties of adhesives were studied. The properties of NaOH catalyzed phenol-formaldehyde (PF) adhesive, NaOH and Ba(OH)2 compound catalyzed PF adhesive, NaOH and Ba(OH)2 compound catalyzed phenol-resorcinol-formaldehyde (PRF) adhesive, and the prepared recombinant bamboo with three kinds of adhesives were compared. The experimental results show that NaOH and Ba(OH)2 compound catalyst not only shortens the curing time of PF adhesive, but also guarantees the suitable water solubility of adhesive. After copolycondensation with resorcinol, the curing time of adhesive is further shortened, the water solubility is improved obviously, and the highest bonding strength is obtained. Infrared spectrum analysis shows that the reaction activity point of NaOH and Ba(OH)2 compound catalyzed PRF adhesive will increase, so that both the curing temperature and curing enthalpy decrease.