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Study on the Proper pH Range for Paper Documents Preservation
Received:November 18, 2020  
DOI：10.11980/j.issn.0254-508X.2021.04.007
Key Words:range of pH value  paper documents  preservation
Fund Project:广州市科技计划项目(项目编号 GZDD201808)。
Author NameAffiliationPostcode
LIU Jianan Key Lab of Pulp & Paper Engineering， Research Center of Ancient Books Protection and Utilization， National Engineering Research Center of Papermaking and Pollution Control， State Key Lab of Pulp ＆ Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province ，510640 510640
ZHANG Yongli Key Lab of Pulp & Paper Engineering， Research Center of Ancient Books Protection and Utilization， National Engineering Research Center of Papermaking and Pollution Control， State Key Lab of Pulp ＆ Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province ，510640 510640
WANG Huanhuan Key Lab of Pulp & Paper Engineering， Research Center of Ancient Books Protection and Utilization， National Engineering Research Center of Papermaking and Pollution Control， State Key Lab of Pulp ＆ Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province ，510640 510640
ZHOU Ziyin Key Lab of Pulp & Paper Engineering， Research Center of Ancient Books Protection and Utilization， National Engineering Research Center of Papermaking and Pollution Control， State Key Lab of Pulp ＆ Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province ，510640 510640
LIAO Yunfei Key Lab of Pulp & Paper Engineering， Research Center of Ancient Books Protection and Utilization， National Engineering Research Center of Papermaking and Pollution Control， State Key Lab of Pulp ＆ Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province ，510640 510640
FAN Huiming Key Lab of Pulp & Paper Engineering， Research Center of Ancient Books Protection and Utilization， National Engineering Research Center of Papermaking and Pollution Control， State Key Lab of Pulp ＆ Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province ，510640 510640
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Abstract:The initial pH value of the paper was changed by the ultrasonic atomization method， and the pretreated paper was subjected to damp and heat aging， and the appropriate pH range for the preservation of the paper was explored by evaluating its color difference， mecha-nical properties， thermal stability， degree of polymerization， crystallinity and functional group changes. The results showed that the range of pH value suitable for long-term storage of paper was 8.0~8.5， and the end point of deacidification should be kept within this range for acidified paper documents. If the pH value of the paper was too high or too low， the cellulose would be hydrolyzed， the mechanical properties of the paper would decrease， the thermal stability would deteriorate， the crystallinity and degree of polymerization would decrease， and the yellowing of the paper would be accelerated. During deacidification， in order to avoid alkaline hydrolysis of cellulose under high pH conditions， the pH value of the deacidification agent selected in the deacidification protection of paper documents should not be too high.
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