碱浸渍对芦苇茎秆微观结构及其机械浆性能的影响

Effect of Alkali Impregnation on Microstructure and Mechanical Pulp Properties of Reed Stem

关键词:  芦苇茎秆  微观结构  机械浆  碱浸渍

Key Words:reed stem  microstructure  mechanical pulp  alkali impregnation

摘要:探究了不同条件碱浸渍处理对芦苇茎秆微观结构的改变及对后续芦苇机械浆性能的影响。结果表明，在不同用碱量和温度下，碱浸渍对芦苇茎秆的表观和内部结构有不同程度的改变；随着用碱量和浸渍温度的增加，芦苇茎秆微观表层和内部结构被破坏的程度增大，且破坏程度与后续的成浆性能有一定的关联性。当用碱量6%（以NaOH计）、温度120℃、时间90 min时，芦苇茎秆的微观结构变化较大，表面覆盖的由蜡质层和硅质化膜层组成的角化层破损严重，维管束中的填充物消失，碱液通道打开，此时芦苇机械浆各项性能最好。

Abstract:The effects of different alkali treatments on microstructure and the subsequent mechanical pulp properties of reed stem were studied. The results showed that the appearance and internal structure of reed stem were changed in varying degrees by alkali impregnation under different alkali dosage and temperature. The damage degree of the micro-surface and internal structure of the reed stem increased with the increase of alkali dosage and impregnation temperature， which was closely related to the mechanical pulping performance of the subsequent process. When the dosage of NaOH was 6% and the temperature was 120℃ with time of 90 min， the micro-structure of reed stem changed greatly. The keratinized layer covered of waxy layer and silicified layer covering the surface was seriously damaged， and the material filled in vascular bundle disappeared which created the channels for alkali liquor. At that time， the mechanical pulp of reed had the best performance.