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

Kód výsledku v 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>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

O - Ostatní výsledky

CEP obor

JH - Keramika, žáruvzdorné materiály a skla

OECD FORD obor

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Projekt

<a href="/cs/project/DF12P01OVV017" target="_blank" >DF12P01OVV017: Technologie údržby a konzervace mozaiky Posledního soudu a metody restaurování-konzervování středověkého a archeologického skla.</a><br>

Návaznosti

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

Rok uplatnění

2015

Kód důvěrnosti údajů

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