四硼酸锂用于纸张脱酸研究

Paper Deacidification with Lithium Tetraborate

关键词:  纸张  脱酸  四硼酸锂  硼砂

Key Words:paper  deacidification  lithium tetraborate  borax

摘要:在25℃下采用四硼酸锂对两种纸张进行脱酸处理及脱酸后的老化实验，观察了脱酸剂浓度、处理时间对脱酸效果的影响，并与硼砂脱酸效果进行了比较。结果表明，纸张在质量浓度5.0 mg/mL的四硼酸锂中浸泡30 min后的强度性能较好，且脱酸后纸张的pH值控制在理想范围。老化实验后，四硼酸锂脱酸的纸张强度性能下降幅度要明显低于未脱酸处理纸张。在最佳脱酸剂质量浓度和处理时间条件下，与硼砂脱酸相比，四硼酸锂脱酸纸张的强度性能更好，四硼酸锂是一种较好的纸张脱酸剂。

Abstract:In this work, lithium tetraborate was used for deacidification of two kinds of paper. Effects of concentration of lithium tetraborate and treatment time on pH and strengh properties of the paper were mainly investigated at 25℃, the deacidification effects of lithium tetraborate were compared with that of borax. Results showed that the strengh properties of treated paper were the best when the concentration of lithium tetraborate was 5.0 mg/mL and the immersion time was 30 min, and the pH of treated paper could be controlled in an appropriate range of 7.5~8.5. After aging test, the strengh properties of the paper deacidified with lithium tetraborate didn’t significantly deteriorate comparing those of un-aged paper. Under optimal deacidification solvent concentration and treatment time, strength properties of the paper deacidified with lithium tetraborate were better than those deacidified with borax. In a word, lithium tetraborate was a good reagent for paper deacidification.