Innovative neutralizing and strengthening treatments for aged acidic paper have been developed, based on the use of supercritical carbon dioxide (CO2SCF) as solvent system. After treatment with the non toxic neutralizing agent CaCO3 in CO2SCF, acidic papers exhibited a pH increase of water extracts, the creation of an alkaline reserve and a decrease in the rate of artificial aging, while mechanical tensile properties properties of aged acidic papers improved after treatment with catechol both simply dissolved in ethanol or in CO2SCF in the presence of ethanol as co-solvent.
Preservation treatments of aged papers by supercritical carbon dioxide / E. Selli, E. Lange, A. Mossa, G. Testa, A. Seves. - In: MACROMOLECULAR MATERIALS AND ENGINEERING. - ISSN 1438-7492. - 280:7-8(2000), pp. 71-75.
Preservation treatments of aged papers by supercritical carbon dioxide
E. Selli;
2000
Abstract
Innovative neutralizing and strengthening treatments for aged acidic paper have been developed, based on the use of supercritical carbon dioxide (CO2SCF) as solvent system. After treatment with the non toxic neutralizing agent CaCO3 in CO2SCF, acidic papers exhibited a pH increase of water extracts, the creation of an alkaline reserve and a decrease in the rate of artificial aging, while mechanical tensile properties properties of aged acidic papers improved after treatment with catechol both simply dissolved in ethanol or in CO2SCF in the presence of ethanol as co-solvent.
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