THE EFFECT OF A HINDERED AMINE LIGHT STABILIZER ON THE AGING OF DAMMAR AND MASTIC VARNISH IN AN ENVIRONMENT FREE OF ULTRAVIOLET LIGHT
| Autor: | E. René de la Rie, Christopher W. McGlinchey |
|---|---|
| Rok vydání: | 1990 |
| Předmět: |
Materials science
Benzotriazole Varnish Conservation medicine.disease_cause Accelerated aging chemistry.chemical_compound chemistry visual_art medicine visual_art.visual_art_medium Ultraviolet light Amine gas treating Solubility Composite material Ultraviolet Nuclear chemistry Stabilizer (chemistry) |
| Zdroj: | Studies in Conservation. 35:160-164 |
| ISSN: | 2047-0584 0039-3630 |
| Popis: | Long-term accelerated aging in an environment free of ultraviolet (UV) light of dam mar resin films, containing the hindered amine light stabilizer (HALS) Tinuvin 292, shows that for best results the concentration of the additive may be increased to 3% from the previously recommended level of 2%, and also that the benzotriazole UV-absorber Tinuvin 328 can be omitted. Stabilized dammar films last virtually unchanged for 3,000 hours in the fadeometer and suffer only minor changes after twice that amount of time. Assuming that the law of reciprocity holds, stabilized dammar varnish would retain its transparency and solubility for more than 136 years in a gallery free of UV light illuminated at 1,000 lux. Because films of gum mastic are less stable than dammar films, they may need 4% HALS in order to be stabilized successfully. The results of tests on dammar and mastic films containing HALS, naturally aged for several years, confirm the results of accelerated aging experiments. Differential scanning c... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|