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Study on the Application of Water-soluble Chitosan of Different Molecular Weights in the Reinforcement of Paper Documents
Received:December 29, 2023  
DOI：10.11980/j.issn.0254-508X.2024.05.015
Key Words:water-soluble chitosan  molecular weight  paper document  enhanced reinforcement
Fund Project:广州市科技计划项目（GZDD201808）；广州市社会科学界联合会（202103260039）；华南理工大学制浆造纸国家重点实验室（2020ZR03）。
Author NameAffiliationPostcode
LIU Jian’an State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640
Lingnan Literature Preservation Research Center， Guangzhou， Guangdong Province， 510640 		510640
GE Ge State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640
Lingnan Literature Preservation Research Center， Guangzhou， Guangdong Province， 510640 		510640
WANG Huanhuan State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640
Lingnan Literature Preservation Research Center， Guangzhou， Guangdong Province， 510640 		510640
FAN Huiming* State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640
Lingnan Literature Preservation Research Center， Guangzhou， Guangdong Province， 510640 		510640
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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.
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