纳米氢氧化镁应用于纸质文物的脱酸

Deacidification of Paper Based Cultural Relics Using Nano-Mg(OH)2

关键词:  纸质文物  纳米氢氧化镁  脱酸

Key Words:paper based cultural relics  nano magnesium hydroxide  deacidification

摘要:通过不同工艺制备纳米氢氧化镁（Mg(OH)₂），探讨了工艺条件对纳米粒径及其分布的影响。将制备的纳米Mg(OH)₂用于纸质文物的脱酸处理，通过加速热老化探讨纸张的pH值及抗张强度随时间的变化关系。结果表明，在超声波（40 kHz）和加温（90℃）的条件下可以制备纳米粒径分布窄（17.9~86.6 nm）、平均粒径在44.2 nm左右的粒子；脱酸处理后纸张的pH值得到了明显的提高（从4.5提高到8.5）；热老化实验表明，脱酸处理后纸张pH值（7.5左右）和抗张强度（715 N/m左右）比较稳定，从而能够长时间保存。

Abstract:The preparation of nano-Mg(OH)₂ by different processes, and the effect of the process on particle size and its distribution of nano-Mg(OH)₂ were studied. The nano-Mg(OH)₂ was used in deacidification treatment of the paper based cultural relics. The results showed that with the aid of ultrasonic and high temperature(90℃), the particles of Mg(OH)2 prepared had a narrow size distribution between 17.9 nm and 86.6 nm, the mean size was 44.2 nm. After deacidification treatment with the nano- Mg(OH)2 the pH value of the papers increased from 4.5 to 8.5. The heat aging test indicated that the papers after deacidification showed a good stability of pH value (~7.5) and the tensile strength (~715 N/m) so that they could be conserved for long-time.