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Research on the Regulation of Dispersion Stability of Synthetic Calcium Carbonate and Its Effect on Deacidification of Paper-based Documents
Received:January 20, 2024  
DOI：10.11980/j.issn.0254-508X.2024.08.008
Key Words:paper-based document protection  deacidification  synthesis calcium carbonate  methylcellulose
Fund Project:华南理工大学基本科研业务费项目（2022ZYGXZR106）；广州市科技计划特批项目（GZDD201808）。
Author NameAffiliationPostcode
ZHAO He School of Light Industry and Engineering， State Key Lab of Pulp and Paper Engineering， Lingnan Literature Preservation Research Center， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
HE Bei Engineering Research Center of Historical Cultural Heritage Conservation， Ministry of Education， School of Materials Science and Engineering， Shaanxi Normal University， Xi’an， Shaanxi Province， 710119 710119
CAO Xian School of Light Industry and Engineering， State Key Lab of Pulp and Paper Engineering， Lingnan Literature Preservation Research Center， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
LIU Chuanfu School of Light Industry and Engineering， State Key Lab of Pulp and Paper Engineering， Lingnan Literature Preservation Research Center， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
FAN Huiming School of Light Industry and Engineering， State Key Lab of Pulp and Paper Engineering， Lingnan Literature Preservation Research Center， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
TANG Donglin School of Materials Science and Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
ZHAO Lihong School of Light Industry and Engineering， State Key Lab of Pulp and Paper Engineering， Lingnan Literature Preservation Research Center， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
REN Junli* School of Light Industry and Engineering， State Key Lab of Pulp and Paper Engineering， Lingnan Literature Preservation Research Center， South China University of Technology， Guangzhou， Guangdong Province， 510640 510640
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Abstract:In this study， the particle size and dispersion stability of synthesized calcium carbonate dispersion system were regulated by methylcellulose as dispersion agent. Then the calcium carbonate dispersion system was applied to the deacidification of acidified paper literature， and the aging resistance was evaluated. The results showed that the calcium carbonate dispersion system synthesized in a carbon dioxide atmosphere using methylcellulose with viscosity of 1 500 mPa·s and calcium hydroxide at mass ratio of 1∶4 achieved optimal dispersion stability. The average particle size of the calcium carbonate was 108 nm， and it remained stably dispersed even after standing for 5 days. The pH value of the old-book paper treated with calcium carbonate dispersion system increased from 4.7 to 7.7， the alkali reserve was 1.95% calcium carbonate equivalent. After accelerated aging for 14 days， the deacidified old-book paper still maintained pH value was 7.5 and the alkali reserve was 1.70% calcium carbonate equivalent. The mechanical properties of the deacidified old-book paper were significantly higher than those of the untreated group， and the chromatic aberration was less than 1 which had no effect on the handwriting ink， indicating that the system had excellent deacidification and aging resistance to paper-based documents.
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