A new preventive coating for building stones mixing a water repellent and an eco-friendly biocide

Stéphanie Eyssautier-Chuine 1, 2 Ivan Calandra 3 Nathalie Vaillant-Gaveau 4, 2 Gilles Fronteau 2, 1 Céline Thomachot-Schneider 1, 2 Julien Hubert 2, 1 Jessica Pleck 5 Maxime Gommeaux 1, 2
1 GEGENAA - Groupe d'Étude sur les Géomatériaux et Environnements Naturels, Anthropiques et Archéologiques - EA 3795
2 URCA - Université de Reims Champagne-Ardenne
3 PEPS - PaleoEnvironnements et PaleobioSphere
4 URVVC - Unité de Recherche Vigne et Vins de Champagne Stress et Environnement - EA 4707
5 Certech - Centre de Ressources Technologiques en Chimie
Abstract : The durability of stone monuments is a constant problem as their decay through weathering is irremediable and endless. Fortunately, coatings are becoming more and more efficient and tailored to specific alterations of the stone material. This study aimed at developing an eco-friendly coating with both hydrophobic and biocide properties based on a silane/siloxane emulsion as a water repellent combined with chitosan and silver nitrate as biocides. Chitosan was first added at different concentrations to the water repellent and its efficacy was tested in laboratory conditions by the inoculation of axenic suspension of the green algae Chlorella vulgaris on a building porous limestone. Chlorophyll a fluorescence analysis displayed the chitosan acted on the photosystem of algae and limited their development but its effect was not optimal and higher dose modified the aspect of the stone. Low concentration of silver nitrate achieved a good performance thanks to the combination with the chitosan and the water repellent. The properties of coated stones and the efficacy of the formulation were assessed at two different doses of coating. The results showed that the lowest dose gathered all requirements to both preserve the stone monument with a weak colour change over time and to reach optimal biocide effect and a good hydro- phobicity.
Keywords : Coating Biocide Hydrophobic Chitosan Silane/siloxane Cultural Heritage
Document type :
Journal articles
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https://hal.univ-reims.fr/hal-02409969
Contributor : Gilles Fronteau <>
Submitted on : Friday, December 13, 2019 - 4:05:41 PM
Last modification on : Tuesday, December 17, 2019 - 2:27:33 AM

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Stéphanie Eyssautier-Chuine, Ivan Calandra, Nathalie Vaillant-Gaveau, Gilles Fronteau, Céline Thomachot-Schneider, et al.. A new preventive coating for building stones mixing a water repellent and an eco-friendly biocide. Progress in Organic Coatings, Elsevier, 2018, 120, pp.132-142. ⟨10.1016/j.porgcoat.2018.03.022⟩. ⟨hal-02409969⟩

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