Preservation of aged paper using borax in alcohols and the supercritical carbon dioxide system
Preservation of aged paper using borax in alcohols and the supercritical carbon dioxide system
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DOI：
10.1016/j.culher.2012.02.010
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发表时间：
2013-01-01
影响因子：
3.1
通讯作者：
Liu Chunying
中科院分区：
文献类型：
--
作者：
Wang Yanjuan;Fang Yanxiong;Liu Chunying
选择合适的纸张脱酸剂对纸张的脱酸至关重要。使用三种脱酸剂（即，通过考察纸张表面pH值、碱残留量、纸张白度、强度等性能指标，研究了三种常用的降酸剂（异丁胺、丙酸钙、异丁胺）对纸张进行浸泡降酸处理。结果表明，造纸黑液除酸不仅能提高纸张的适宜pH值范围，提高碱储量，改善纸张外观，而且能提高纸张的机械强度，即使经过人工老化也能保持较好的机械强度。超临界二氧化碳（CO_2SCF）作为溶剂体系，以水和乙醇的混合溶液作为酸性纸张的脱酸剂。CO2超临界流体通过显著提高pH值和碱残值改善了脱酸过程。超临界流体中的纤维素可以与纤维素羟基更好地结合，从而大幅度提高纸张的力学性能。CO_2超临界流体处理废纸是酸性纸的一种替代方法。除了改善pH值和沉积足够的碱性残留物外，CO2SCF还增强了处理过的纸张的机械性能。(C)2012年Elsevier Masson SAS。All rights reserved.
Selecting an appropriate paper deacidification agent is very important for the deacidification of paper. The use of three deacidification agents (i.e., iso-butylamine, calcium propionate, and borax) is studied for the deacidification of paper using the immersion treatment by investigating the paper surface pH, alkaline residue, paper whiteness, strength, and other performance indicators. Results show the deacidification by borax solution not only results in the promotion of a proper pH range, high level of alkali reserves, and ignorable influence to paper appearance, but also to the enhancement of the mechanical intensities of paper even after artificial aging. Supercritical carbon dioxide (CO2SCF), as a solvent system, is used in the deacidification of acidic papers using the borax solution of water and alcohol. CO2SCF improved the deacidification process by significantly improving the pH value and the base residual value. The borax in supercritical fluids can be better combined with cellulose hydroxyl to improve the mechanical properties of paper substantially. The treatment of borax in CO2SCF could be an alternative for acidic papers. Aside from improving the pH and depositing a sufficient alkaline residual, CO2SCF also strengthens the mechanical properties of treated papers. (C) 2012 Elsevier Masson SAS. All rights reserved.