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

doi:10.3964/j.issn.1000-0593(2018)02-0418-06

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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.

Key words： High-field ²⁷Al-NMR FTIR UV-Vis Xuan paper Aluminum sizing precipitant Sizing Mechanism

Received: 2017-02-22 Accepted: 2017-07-11

ZTFLH:

O657.3

Corresponding Authors: WANG Li-qin E-mail: wangliqin@nwn.edu.cn

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http://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2018)02-0418-06 OR http://www.gpxygpfx.com/EN/Y2018/V38/I02/418

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