Paper Conservation Using Aqueous Solutions of Calcium Hydroxide/Methyl Cellulose Preparation of the solution
| Hlavní autori: | , |
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| Médium: | Článok |
| Jazyk: | angličtina slovenčina |
| ISSN: | ISSN 0034-5806 |
| On-line prístup: | http://www.viks.sk/chk/res_1_03_1_17.doc |
| Abstrakt: | SUMMARIES. The results of the paper conservation treatment using Ca(OH)2/methyl cellulose solutions prepared by two different methods were estimated by measuring chemical, mechanical and optical properties of treated and untreated papers. The permanence of papers treated was tested by accelerated ageing. The results obtained showed that treatment with the solution prepared by mixing solid Ca(OH) 2 with methyl cellulose solution (solid phase method, SPM) resulted in a higher alkaline reserve than the treatment with a solution prepared by mixing a solution of Ca(OH) 2 with methyl cellulose solution (liquid phase method, LPM). The alkaline reserve deposited by SPM gave better protection during accelerating ageing. CONCLUSIONS ˙ Our study showed that the SPM treatment was superior to the LPM treatment with respect to the alkaline reserve. The alkaline reserve decreased during accelerated ageing both in the neutral and in the acidic paper, but it remained at a level sufficient for paper protection against the acid-catalysed hydrolysis, especially in the acidic paper. ˙ The strengthening effect of the LPM treatment was greater for both the neutral paper and the acidic paper than the effect of the SPM treatment. ˙ In the case of the neutral paper, a higher alkaline reserve was deposited by the SPM treatment. This provided good protection against cellulose degradation during ageing. In the acidic paper, the accelerated ageing procedure used in this study was not appropriate to estimate the difference between the LPM and SPM treatments. ˙ Both treatments protected the papers against deterioration compared to the untreated paper. |
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| ISSN: | ISSN 0034-5806 |
