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A new bio-based organogel for the removal of wax coating from indoor bronze surfaces
- Source :
- Heritage Science, Vol 7, Iss 1, Pp 1-12 (2019)
- Publication Year :
- 2019
-
Abstract
- In this research, we propose an advanced system for the cleaning of wax-based coatings applied on indoor bronzes. To this aim we developed a new kind of eco-friendly gel based on PHB (poly-3-hydroxybutyrate) used as thickening agent, biodiesel (BD) and dimethyl carbonate (DMC). BD is a mixture of methyl esters obtained from palm oil, which acts as cleaning agent while DMC was added as additional solvent to partially solubilize PHB and forming a gelly phase. For the first time a PHB-based gel obtained by mixing two solvents with different proprieties was proposed, expanding the range of possible formulations, that can be used according to the specific restoration purpose. After the preliminary characterization of chemical and physical properties of the gel, an ad hoc analytical protocol was implemented to evaluate both the cleaning efficiency and the release of residues on the treated surfaces. Standard samples were prepared following ancient recipes and submitted to spectroscopic and chromatographic analysis before and after the cleaning procedures. Finally, the performances of PHB-DMC/BD gel were assessed on a real case of study presenting a wax-based coating: the Pulpito della passione attributed to Donatello and dated back to 1460. In situ analysis demonstrated the high cleaning efficiency of the proposed systems also for the removal of aged coatings.
- Subjects :
- Cleaning agent
Archeology
Materials science
lcsh:Fine Arts
lcsh:Analytical chemistry
Mixing (process engineering)
Conservation
engineering.material
Polyhydroxyalkanoate
01 natural sciences
Green organogel
chemistry.chemical_compound
Coating
0103 physical sciences
Wax-based coatings
Wax
Biodiesel
lcsh:QD71-142
010304 chemical physics
Polyhydroxyalkanoates
010401 analytical chemistry
Indoor bronzes
0104 chemical sciences
Solvent
chemistry
Chemical engineering
Indoor bronze
visual_art
visual_art.visual_art_medium
engineering
lcsh:N
Dimethyl carbonate
Thickening agent
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Heritage Science, Vol 7, Iss 1, Pp 1-12 (2019)
- Accession number :
- edsair.doi.dedup.....2f2dbbd03f8f7999c88c058813db3cec