Improved Paper Deacidification Performance with CaMgO2 Nanocomposite in Fluorocarbon Solvent

Paper acidification is the primary factor causing the rapid deterioration of paper documents. To overcome drawbacks of single type of deacidification agent for paper deacidification, the innovative application of a composite deacidification agent was proposed and significantly enhanced the comprehensive performance of the paper and prolonged the stability of acidic paper. The environmentally friendly fluorocarbon solvent of methyl perfluoroisobutyl ether was employed as the main solvent, reducing the harm to operators and the environment. Different calcium magnesium oxide (CaMgO 2 ) nanocomposites were synthesized and their effect on paper performance was explored by comparing the pH, whiteness, tensile strength and alkali reserve of the treated paper samples. The results indicate that owing to the excellent dispersion effect of calcium magnesium oxide in fluorocarbon solvents and their good compatibility with paper fibers, it has the slightest impact on the appearance of paper. Moreover, the pH value is raised from 5 to 9, and the deacidification effect is most remarkable when the molar ratio of Mg to Ca is 0.2:0.8. After the deacidification treatment and artificial aging treatment, the paper performance is still maintained with good pH and mechanical strength and almost no generating ink marks, which is suitable for the protection of ancient books and archives through deacidification.