酚醛树脂处理杨木、杉木尺寸稳定性分析

Dimensional Stability of Surface-Compressed Wood by PF Resin Treatment

采用酚醛树脂浸渍处理人工林杨木、杉木,然后通过热压定型工艺制得表面密实化木材。对其尺寸稳定性的分析结果表明:处理试材的增重率、抗胀率和阻湿率随树脂浓度的增加而成比例增大,弦向和径向干缩率明显降低,在树脂浓度较低时变化较大,当达到一定量时变化趋于稳定。就压缩变形恢复率而言,当树脂浓度超过10%,压缩变形恢复率很小,说明表面密实化木材的压缩变形几乎被固定。

Specimens of Poplar (Populus xeuramericana Guinier CI.'San Martino' and P. Deltoides Bartr CI.'Lux') and Chinese Fir (Cunninghamia lanceolata) were measured and weighed. They were then impregnated with PF resin, surface compressed and then again measured and weighed. The results showed that with the increase in resin concentration, the weight percent gain (WPG), anti-shrink efficiency (ASE) and moisture excluding efficiency (MEE) of the treated wood increased proportionally, while its tangential and radial shrinking ratio decreased. When the resin concentration was lower, the changes of all the above indexes appeared more pronounced and tended to be stable until a certain level. The compression deformation recovery rate of the treated wood was slight when the resin concentration exceeded 10%, which meant that the compressive (deformation) was almost constant for wood.