Removal of a synthetic soiling mixture from mastic, shellac and Laropal K80 coatings using two hydrogels

Galatis, Panagiotis, Boyatzis, Stamatis and Theodorakopoulos, Charis (2015) Removal of a synthetic soiling mixture from mastic, shellac and Laropal K80 coatings using two hydrogels. In: Conservation of Cultural Heritage: Challenges and Reviews, 25th - 29th May 2015, Athens, Greece.

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Abstract

The effects of two hydrogels employed for the selective removal of a synthetic soiling mixture on mastic, shellac and Laropal® K80 varnishes are investigated. The varnishes were on aluminium substrates and subjected to accelerated degradation in a xenon-arc fadeometer. A mixture, simulating urban pollution, was produced applied on the degraded varnish films. The fabricated soil-resin film samples were further irradiated in the xenon-arc fadeometer. Subsequently, a sodium acetate pH 5.5 hydrogel and a sodium deoxycholate pH 7.8 hydrogel were produced using acetic acid and deoxycholic acid, sodium hydroxide, a non-ionic polyethoxylate surfactant and cellulose derivative polymers. Both hydrogels were applied to the corresponding samples and the cleaning results were evaluated using ultraviolet fluorescence imaging, Fourier Trasform Infrared Spectroscopy and Reflection Absorption Infrared and semi-quantitative data analysis. The experimental data indicated the removal of both the soiling layer as well as the partial removal of the uppermost layers of the degraded coatings. This may have been caused by the penetration of the soiling layer into the substrates followed by partial ionisation and dissolution of the upper layers of the degraded films.

Item Type: Conference or Workshop Item (Paper)
Additional Information: Charis Theodorakopoulos is in the scientific committee and an editorial member for this particular issue of the Journal of Conservation and Museum Studies - no dates of publication have been announced
Subjects: F100 Chemistry
F200 Materials Science
J500 Materials Technology not otherwise specified
W100 Fine Art
Department: Faculties > Arts, Design and Social Sciences > Arts
Related URLs:
Depositing User: Charis Theodorakopoulos
Date Deposited: 05 Apr 2016 14:51
Last Modified: 13 Nov 2017 13:21
URI: http://nrl.northumbria.ac.uk/id/eprint/25927

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