Investigation on protective hybrid silica coatings on historical glass: Comparative study and new approaches

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F15%3A43901017" target="_blank" >RIV/60461373:22310/15:43901017 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Investigation on protective hybrid silica coatings on historical glass: Comparative study and new approaches

Original language description

Historical stained glass or glass mosaics are an integral part of a very fragile and valuable heritage placed on many civil and religious buildings. As such an exterior architectural glass preferably remains in its original surrounding, it is heavily endangered by weathering phenomena. Since the protective glazing does not eliminate completely weathering issues, there is a strong interest in the application of protective coatings which have been used with mixed success since the beginning of the last century. More recently, the attention has been focused particularly on development of advanced hybrid organic-inorganic silicon-based coatings. In this study, we investigated newly designed hybrid silica coatings prepared via the sol-gel process consisting in mixing a silica-based inorganic matrix (tetraethyl orthosilicate) with different quantities of Si-alkoxides functionalized with various organic groups. In addition, we analysed also the influence of possible multi-layering and addition of different substances modifying final flow properties. All the tested coatings were dip-coated onto the glass samples at low temperatures without any heat treatment. Besides that, also some of already existing commercial hybrid silica products were tested. The samples were analysed before and after different model aging tests simulating various weathering parameters. After aging, the best performing coatings showed good overall homogeneity and transparency (optical and scanning electron microscopy), improved water repellency and adhesion to the glass substrate (static contact angle measurements, cross-cut tape tests) and no colour or chemical composition shifts (UV-VIS, FTIR). In general, we approved that these transparent low temperature coatings, easily applicable to thin films, appear to satisfy the main requirements for the protection of glass exposed to weathering phenomena.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

JH - Ceramics, fire-proof materials and glass

OECD FORD branch

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Project

<a href="/en/project/DF12P01OVV017" target="_blank" >DF12P01OVV017: Technology of maintenance and conservation of the Last Judgment mosaic and methods of medieval and archaeological glass conservation.</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2015

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů