Evaluation of the Solubility and Colour Changes of Artificially and Naturally Aged Adhesives for the Conservation of Ceramics and Glass in Studies in conservation, Vol.67 N°7-8(2022; October-November) (2022-10-01)  

Public ISBD [article]  inStudies in conservation > Vol.67 N°7-8(2022; October-November) (2022-10-01) . - P. 500-517 Titre : Evaluation of the Solubility and Colour Changes of Artificially and Naturally Aged Adhesives for the Conservation of Ceramics and Glass Type de document : texte imprimé Année de publication : 2022 Article en page(s) : P. 500-517 Langues : Anglais (eng) Catégories : Adhésifs -- Conservation et restauration -- Méthode comparative Adhésifs -- Couleur -- Altération Adhésifs -- Déterioration -- Méthode comparative Adhésifs -- Solubilité Art du verre -- Conservation et restauration Céramique -- Conservation et restauration Polymères vinyliques Réticulation (polymérisation) Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : With the occasion of the exhibition Fatti come nuovi (20 October 1985–12 January 1986), where the most prominent artworks of the Poldi Pezzoli Museum in Milan were shown after restoration, a multidisciplinary project was launched between the Museum and the Italian Montedison group. This project aimed at evaluating several conservation products used at the time in ceramic and glass conservation, such as adhesives and retouching varnishes. In the frame of the project, two-component epoxy adhesives (Plastogen® EP, HXTAL NYL-1), acrylates (Paraloid® B-72, Plastogen® G), vinyl acetate dispersions (Vinavil®, Arkolyn), a polyester resin and cellulose nitrate adhesives (HMG, AGO® Goldsiegel) were studied in terms of their mechanical properties and colour change upon artificial ageing by UV-VIS radiation. Since then, the samples were kept in the dark. Almost 30 years later, the samples have been re-evaluated for changes in solubility and colour upon natural ageing. En ligne : https://www.tandfonline.com/doi/abs/10.1080/00393630.2021.1995262 [article] Evaluation of the Solubility and Colour Changes of Artificially and Naturally Aged Adhesives for the Conservation of Ceramics and Glass [texte imprimé] . - 2022 . - P. 500-517. Langues : Anglais (eng) in Studies in conservation > Vol.67 N°7-8(2022; October-November) (2022-10-01) . - P. 500-517 Catégories : Adhésifs -- Conservation et restauration -- Méthode comparative Adhésifs -- Couleur -- Altération Adhésifs -- Déterioration -- Méthode comparative Adhésifs -- Solubilité Art du verre -- Conservation et restauration Céramique -- Conservation et restauration Polymères vinyliques Réticulation (polymérisation) Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : With the occasion of the exhibition Fatti come nuovi (20 October 1985–12 January 1986), where the most prominent artworks of the Poldi Pezzoli Museum in Milan were shown after restoration, a multidisciplinary project was launched between the Museum and the Italian Montedison group. This project aimed at evaluating several conservation products used at the time in ceramic and glass conservation, such as adhesives and retouching varnishes. In the frame of the project, two-component epoxy adhesives (Plastogen® EP, HXTAL NYL-1), acrylates (Paraloid® B-72, Plastogen® G), vinyl acetate dispersions (Vinavil®, Arkolyn), a polyester resin and cellulose nitrate adhesives (HMG, AGO® Goldsiegel) were studied in terms of their mechanical properties and colour change upon artificial ageing by UV-VIS radiation. Since then, the samples were kept in the dark. Almost 30 years later, the samples have been re-evaluated for changes in solubility and colour upon natural ageing. En ligne : https://www.tandfonline.com/doi/abs/10.1080/00393630.2021.1995262

Material Selection for the Hydrophobic Cushion Layer Applied to Earthen Sites in Northwest China in Studies in conservation, Vol.68 N°1-2(2023; January-February) (2023-01-01)

Public ISBD [article]  inStudies in conservation > Vol.68 N°1-2(2023; January-February) (2023-01-01) . - P. 243-257 Titre : Material Selection for the Hydrophobic Cushion Layer Applied to Earthen Sites in Northwest China Type de document : texte imprimé Année de publication : 2023 Article en page(s) : P. 243-257 Langues : Anglais (eng) Catégories : Construction -- Matériaux -- Analyse Constructions -- Effets des agents atmosphériques Constructions en terre -- Chine (nord-ouest) -- Conservation et restauration Constructions en terre -- Chine (nord-ouest) -- Érosion Contraintes (mécanique) Huile de Toung Matériaux -- Couleur -- Altération Polymères vinyliques Sols -- Dégradation Surfaces hydrophobes Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : Earthen sites with important historical, cultural, artistic, social, and scientific values have been seriously damaged. Basal erosion, which is caused by soluble salts, water runoff, and sand-driving wind, is an extremely threatening erosion pattern for earthen sites. A cushion layer which has a damp-proofing function and good physical and mechanical properties can effectively decrease basal erosion. The primary aim of this study is to investigate material selection for the hydrophobic cushion layer for earthen sites in northwest China. The results indicate that cooked tung oil and sticky rice liquid, traditionally used in China, cannot meet the fundamental requirements of sufficient hydrophobicity for the cushion layer. Although polyvinyl alcohol (PVA) solution and tung oil exhibit similar properties in terms of soil hydrophobicity, water vapour permeability, water resistance, surface hardness, and colour difference for samples with 0.0-1.0% content, the PVA solution is significantly better than tung oil in unconfined compressive strength, deformation modulus, wave velocity, and viscosity. Therefore, the PVA solution should be preferentially selected as a hydrophobic cushion layer material according to the results of this work. When the mixing method is adopted, 0.6-1.0% PVA content is the best choice. [article] Material Selection for the Hydrophobic Cushion Layer Applied to Earthen Sites in Northwest China [texte imprimé] . - 2023 . - P. 243-257. Langues : Anglais (eng) in Studies in conservation > Vol.68 N°1-2(2023; January-February) (2023-01-01) . - P. 243-257 Catégories : Construction -- Matériaux -- Analyse Constructions -- Effets des agents atmosphériques Constructions en terre -- Chine (nord-ouest) -- Conservation et restauration Constructions en terre -- Chine (nord-ouest) -- Érosion Contraintes (mécanique) Huile de Toung Matériaux -- Couleur -- Altération Polymères vinyliques Sols -- Dégradation Surfaces hydrophobes Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : Earthen sites with important historical, cultural, artistic, social, and scientific values have been seriously damaged. Basal erosion, which is caused by soluble salts, water runoff, and sand-driving wind, is an extremely threatening erosion pattern for earthen sites. A cushion layer which has a damp-proofing function and good physical and mechanical properties can effectively decrease basal erosion. The primary aim of this study is to investigate material selection for the hydrophobic cushion layer for earthen sites in northwest China. The results indicate that cooked tung oil and sticky rice liquid, traditionally used in China, cannot meet the fundamental requirements of sufficient hydrophobicity for the cushion layer. Although polyvinyl alcohol (PVA) solution and tung oil exhibit similar properties in terms of soil hydrophobicity, water vapour permeability, water resistance, surface hardness, and colour difference for samples with 0.0-1.0% content, the PVA solution is significantly better than tung oil in unconfined compressive strength, deformation modulus, wave velocity, and viscosity. Therefore, the PVA solution should be preferentially selected as a hydrophobic cushion layer material according to the results of this work. When the mixing method is adopted, 0.6-1.0% PVA content is the best choice.

Polyvinylamine Gel as a Cleaning Agent for Removing Mineral Crusts from Archaeologically Important Stone Artifacts in Studies in conservation, Vol.67 N°7-8(2022; October-November) (2022-10-01)  

Public ISBD [article]  inStudies in conservation > Vol.67 N°7-8(2022; October-November) (2022-10-01) . - P. 389-399 Titre : Polyvinylamine Gel as a Cleaning Agent for Removing Mineral Crusts from Archaeologically Important Stone Artifacts Type de document : texte imprimé Année de publication : 2022 Article en page(s) : P. 389-399 Note générale : Huarui Han, Jianrui Zha, Feng Wang, Linlin Zhou, Ankun Wang & Shuya Wei Langues : Anglais (eng) Catégories : Calcaire -- Conservation et restauration Imagerie infrarouge Marbre -- Conservation et restauration Polymères vinyliques Sculpture en marbre -- Nettoyage -- Méthode comparative Sculpture en pierre -- Nettoyage -- Méthode comparative Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : When stone objects are excavated at archeological sites, they are often covered with crusts of mineral deposits on the surface, which seriously obscure their aesthetic value, especially in the case of polychrome stone statues. To remove these carbonate crusts without damaging the underlying painting and stone matrix, a gel-based cleaning system combining polyvinylamine (PVAm) and acetic acid is proposed. The structures of the PVAm cleaning gels were characterized using X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. Employing samples of the typical types of stone used in polychrome statues (marble and limestone) and painted samples, the cleaning efficiencies, surface morphologies, and chromatic alterations resulting from treatment with the different cleaning gels were evaluated and compared. Based on the obtained results, the optimal composition of the PVAm cleaning gel was determined. En ligne : https://www.tandfonline.com/doi/abs/10.1080/00393630.2021.1935119 [article] Polyvinylamine Gel as a Cleaning Agent for Removing Mineral Crusts from Archaeologically Important Stone Artifacts [texte imprimé] . - 2022 . - P. 389-399. Huarui Han, Jianrui Zha, Feng Wang, Linlin Zhou, Ankun Wang & Shuya Wei Langues : Anglais (eng) in Studies in conservation > Vol.67 N°7-8(2022; October-November) (2022-10-01) . - P. 389-399 Catégories : Calcaire -- Conservation et restauration Imagerie infrarouge Marbre -- Conservation et restauration Polymères vinyliques Sculpture en marbre -- Nettoyage -- Méthode comparative Sculpture en pierre -- Nettoyage -- Méthode comparative Index. décimale : 7.025 Dommages. Conservation. Protection Résumé : When stone objects are excavated at archeological sites, they are often covered with crusts of mineral deposits on the surface, which seriously obscure their aesthetic value, especially in the case of polychrome stone statues. To remove these carbonate crusts without damaging the underlying painting and stone matrix, a gel-based cleaning system combining polyvinylamine (PVAm) and acetic acid is proposed. The structures of the PVAm cleaning gels were characterized using X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. Employing samples of the typical types of stone used in polychrome statues (marble and limestone) and painted samples, the cleaning efficiencies, surface morphologies, and chromatic alterations resulting from treatment with the different cleaning gels were evaluated and compared. Based on the obtained results, the optimal composition of the PVAm cleaning gel was determined. En ligne : https://www.tandfonline.com/doi/abs/10.1080/00393630.2021.1935119

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