不同分子质量水溶性壳聚糖在纸质文献加固中的应用研究

Study on the Application of Water-soluble Chitosan of Different Molecular Weights in the Reinforcement of Paper Documents

关键词:  水溶性壳聚糖  分子质量  纸质文献  增强加固

Key Words:water-soluble chitosan  molecular weight  paper document  enhanced reinforcement

摘要:本研究采用乙酸酐制备了不同分子质量的水溶性壳聚糖（WSC-3、WSC-10、WSC-20、WSC-30和WSC-60）并用作修复液，探究其对纸质文献加固及耐老化的效果。结果表明，与未经加固处理的纸张（原纸）相比，采用不同分子质量的水溶性壳聚糖加固处理后，纸张的强度性能有所提升，白度下降幅度较小，色差变化较小，pH值和碱储量均增加。纸张加速老化后，与原纸相比，加固处理后纸张的强度性能下降幅度明显较小，其中WSC-30加固处理后纸张的抗张指数、撕裂指数、零距抗张强度的保留率分别提升了9.7、7.4、4.5个百分点，外观形貌、白度和色差等相差较小。

Abstract:In this study， water-soluble chitosan with different molecular weights （WSC-3， WSC-10， WSC-20， WSC-30 and WSC-60） were prepared by acetic anhydride， which were used as restoration liquids to investigate their effects on the reinforcement and ageing resistance of paper documents. The results showed that compared with the paper before reinforcement treatment （original paper）， the strength properties of the papers after reinforcement treatment with water-soluble chitosan of different molecular weights were enhanced， the whiteness was slightly decreased， the colour difference had a minimal change， and pH value and alkali storage capacity both increased. After accelerated aging， the strength properties of the reinforced treated papers showed a significantly smaller decrease compared to the original paper，retention rates of the tensile index， tear index， and zero-distance tensile strength of the WSC-30 reinforced treated paper increased by 9.7， 7.4， and 4.5 percent points， respectively， while the appearance and morphology， whiteness， and colour difference showed little variation.