自水解对速生杨木片碱浸渍性能影响的研究

Effect of Autohydrolysis Pretreatment on the Subsequent Alkali Impregnation of Fast-growing Poplar Wood Chips

关键词:  速生杨木  自水解  碱液预浸渍  物理性质

Key Words:fast-growing poplar  autohydrolysis  alkali impregnation  physical properties

摘要:探索了不同强度自水解预处理后速生杨木边材木片和心材木片的基本物理性质变化，并对自水解预处理后木片的碱液浸渍效果及各方向的浸渍情况进行了分析。结果表明，经自水解预处理后，边材木片和心材木片的基本密度减小，体积孔隙率及饱和含水率增大，而骨架密度几乎保持不变；自水解预处理后的木片在碱液预浸渍过程中，NaOH的吸收量和消耗量都随自水解强度的提高而增大；在对自水解预处理后边材木片各方向的碱液浸渍过程进行研究时发现，边材木片的轴向、径向和弦向的碱液浸渍性能在自水解预处理后都得到了不同程度的提升，且轴向的提升幅度较径向和弦向更加明显。综上所述，对速生杨木片进行自水解预处理能够增强其在后续碱液浸渍过程中的浸渍效果。

Abstract:The basic physical properties of autohydrolyzed fast-growing poplar wood chips were investigated. The alkali impregnation efficiency and the impregnation performance in different directions of autohydrolyzed poplar wood chips in the subsequent alkali impregnation process were also explored. The results showed that, after autohydrolysis pretreatment, the basic densities of poplar sapwood and heartwood chips all decreased, their volume porosities and saturated moisture contents increased, while their skeletal densities almost kept constant. When autohydrolyzed poplar wood chips were carried out alkali impregnation the absorption amounts of NaOH solution and consumption of NaOH increased with increasing of autohydrolysis intensity. The alkali impregnation performances of the sapwood chips in the axial, radial and tangential directions were improved in varying degrees, and the improvement in the axial direction was much more obvious than that in the radial and tangential directions. All of these indicated that the autohydrolysis pretreatment for fast-growing poplar wood chips could enhance their impregnation efficiency in the subsequent alkali impregnation process．