The Application of CarbopolTM Poultices on Paper Objects
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English Slovak |
| Online Access: | http://www.viks.sk/chk/res_4_95_234_247.doc |
| Abstract: | Conclusions. Based on the observations already described, the application on paper objects of Carbopol gels that have been neutralized with organic amines appears somewhat questionable. Even thick intermediary carrier papers become permeated with amines in due course, which leads to contamination of the paper, despite the fact that triethanolamine as well as Ethomeen C-25 are soluble in water and can theoretically, at least, be removed again if thoroughly washed. The question of their retention in the paper is, however, open and should not be neglected -especially in the case of the presence of acid groups in the paper. Apart from this, post treatment after local use by means of aqueous immersion is not generally provided. If Carbopol is neutralized with an inorganic base such as sodium hydroxide or ammonia, it can be applied to paper. However, the above observations recommend avoiding direct contact of the gel with the paper by means of an intermediary carrier, also heavy weighing to prevent the gel permeating the intermediary carrier. These precautionary measures must be taken if the gels are to be used locally without aqueous treatment afterwards. Under such conditions it is feasible to remove adhesives that have been pasted over on papers sensitive to humidity. Summaries. The polyacrylic acid Carbopol has been employed for several years as a gel formative. Characteristics and the ageing process of Carbopol gels are discussed in the light of their application on paper. Investigations showed that neutralizing agents which are necessary to achieve gel formation, are migrating with the moisture to the substrate to which the gel is applied. Special attention is drawn to the behavior of (organic) amines used as neutralizing agents. |
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| ISSN: | ISSN 0034-5806 |
