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

本研究的目的是开发一种可降低模压温度的酚醛树脂。添加青海云杉树皮粉作为硫化促进剂。采用不同的工艺合成了几种酚醛树脂。考察了树皮粉的加入对酚醛树脂固化过程的影响。树皮粉的加入提高了酚醛树脂的粘接强度，表明树皮粉的加入促进了树脂的固化。但是，对于其中一种酚醛树脂，树皮粉的加入提高了100℃压制的层压木材的剪切强度，而与其他酚醛树脂粘结的100℃压制的层压木材的粘接强度没有增加。这些酚醛树脂的化学结构不同，亚甲基桥的数量也不同。

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.