Study of Mechanism of Aluminum Sizing Precipitant on Xuan Paper Based on Spectral Analysis
HE Qiu-ju1，2, WANG Li-qin1*, ZHANG Ya-xu1
1. College of Cultural Heritage，Key Laboratory of Culture Heritage Research and Conservation (Northwest University)，Ministry of Education，Xi’an 710069，China
2. Department of Conservation and Restoration of Cultural Heritage，Key Laboratory of Beijing Cultural Relics and Museums Sci-Tec Protection Research and Application，Capital Museum，Beijing 100045，China
Abstract：In order to investigate the action mechanism of aluminum salts in the process of surface sizing of Xuan paper used in painting and calligraphy，the aluminum species distribution of Alum，polyaluminum chloride (PAC) and polyaluminum sulfate (PAS)，which were commonly used as sizing precipitant，in aqueous solution and mixed with gelatin on the surface of Xuan paper were studied by Al-Ferron complex timed spectrophotometric method (Al-Ferron)，high-field 27Al-NMR spectroscopy (27Al-NMR) and attenuated total reflection infrared spectroscopy (ATR-FTIR) for the first time. (1) Al-Ferron and 27Al-NMR analysis showed that the hydrolysis products of alum and PAS solution were mainly monomeric aluminum Al(H2O)3+6(Al1)，AlSO+4 and polymeric aluminum[Al30O8(OH)56(H2O)24]18+(Al30)；except for Al1 and Al30，polymeric aluminum [AlO4Al12(OH)24(H2O)12]7+(Al13) was also existed in PAC solution；(2) 27Al-NMR analysis showed that the peaks of monomeric and polymeric aluminum were weakened significantly with the combination of aluminum salt and gelatin，and the results of ATR-FTIR showed that the reduced positive hydrolyzed products were probably bonded with hydroxyl (—OH) or carboxyl (—COOH) from gelatin. The tight network structure they formed could improve the crosslinking and water-resistance of the glue. Meanwhile，as a role of precipitants，aluminum hydrolyzed products could transform negative gelatin particles into positive charge，prompting gelatin particles deposited on the negatively charged fibers. After sizing, the hydroxyl groups, some amino and carboxyl groups of gelatin collagen could form many hydrogen bonds with the carboxyl groups in the non ionic region of the plant fibers, so the water resistance of the Xuan paper was improved obviously. In summary，as an effective means to study sizing mechanism，the combination of Al-Ferron，high-field 27Al-NMR and ATR-FTIR technology can rapidly reveal the chemical structure changes of aluminum salts in paper sizing process.
何秋菊，王丽琴，张亚旭. 基于光谱分析技术的宣纸用铝盐施胶沉淀剂作用机理研究[J]. 光谱学与光谱分析, 2018, 38(02): 418-423.
HE Qiu-ju, WANG Li-qin, ZHANG Ya-xu. Study of Mechanism of Aluminum Sizing Precipitant on Xuan Paper Based on Spectral Analysis. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2018, 38(02): 418-423.
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