Development of lower temperature cure phenol-formaldehyde resin modified with bark flour of picea glehnii as a cure accelerator

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The aim of this study is the development of phenol-formaldehyde (PF) resin capable of lower pressing temperature. The bark flour of picea glehnii (Sakhalin spruce) was added as a cure accelerator. Several PF resins were synthesized by different procedures. The effect of the addition of the bark flour on curing process of the PF resins was examined. The bond strength of the PF resins, which showed that cure was accelerated by the addition of the bark flour, was increased by the addition of the bark flour. However, for one of the PF resins, the shear strength of laminated wood pressed at 100℃ was increased by the addition of the bark flour, while the bond strength of laminated wood bonded with the other PF resins and pressed at 100℃ was not increased. The amount of methylene bridges was different among the chemical structures of these PF resins.