纳米氢氧化镁应用于纸质文物的脱酸

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(715N/m左右)比较稳定,从而能够长时间保存。

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

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.