基于超声雾化Ca（OH）2在纸质文物脱酸修复中的研究

Study on the Deacidification Repair of Paper Cultural Relics Based on Ultrasonic Atomization of Ca（OH）2

采用超声雾化法进行纸质文物脱酸修复,利用超声雾化器将脱酸剂Ca(OH)2溶液雾化成微米级液滴,使纸张充分吸收脱酸剂,并且维持纸张不润湿、不变形。探究了超声雾化不同用量的脱酸剂Ca(OH)2溶液对纸张脱酸及脱酸老化后,纸张pH、碱残留、强度性能、白度、色差及表观形貌的变化。分析结果表明脱酸剂浓度在0.4mol/L,0.6mol/L时脱酸及老化后pH均大于7;脱酸纸张的白度、抗张指数、撕裂指数略有下降,但经人工老化后对比,脱酸老化纸张的抗张指数、撕裂指数均比未脱酸老化纸张的高,说明脱酸后纸张的耐久性更好;并且脱酸后色差均小于0.5,肉眼几乎察觉不出变化。因此超声雾化Ca(OH)2可实现纸质文物脱酸修复。

Ultrasonic atomization method is used to deacidify the paper cultural relics. The deoxidizing agent Ca ( OH ) 2 solution is atomized into micron-sized droplets by ultrasonic atomizer to make the paper fully absorb the deacidifying agent and maintain the paper non-wetting, not deformed. The changes of pH, alkali residue, strength properties, whiteness, chromatic aberration and apparent morphology of the paper after deacidification and deacidification aging were studied by ultrasonic atomization of different amounts of deacidification agent Ca( OH)2 solution. The results showed that the deacidification concentration was 0. 4 mol/L and 0. 6 mol/L, and the pH was more than 7 after deacidification and aging. The whiteness, tensile index and tear index of deacidified paper decreased slightly, but artificially aged. After comparison, the tensile index and tear index of the deacidified aged paper were higher than those of the undeacidified aged paper, indicating that the durability of the paper after deacidification was better;and the color difference after deacidification was less than 0. 5 , and the naked eye could hardly perceive it variety. Therefore, ultrasonic atomization of Ca( OH) 2 can realize the deacidification repair of paper cultural relics.