Characterization of a hybrid nano-silica waterborne polyurethane coating for clay bricks / Simonetta Lucia Pagliolico in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 2 (03/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 2 (03/2016) . - p. 267-276 Titre : Characterization of a hybrid nano-silica waterborne polyurethane coating for clay bricks Type de document : texte imprimé Auteurs : Simonetta Lucia Pagliolico, Auteur ; Elena Daniela Ozzello, Auteur ; Guido Sassi, Auteur ; Roberta Bongiovanni, Auteur Année de publication : 2016 Article en page(s) : p. 267-276 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Argile Briques Nanoparticules Photoréticulation Polyacryliques Polyuréthanes Revêtements en phase aqueuse -- Séchage:Peinture en phase aqueuse -- Séchage Revêtements protecteurs Silice La silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux. La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...). Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale. Index. décimale : 667.9 Revêtements et enduits Résumé : A transparent hybrid organic–inorganic waterborne coating was evaluated for the protection of clay bricks. The nanocomposite film was prepared by combining an environmentally friendly process based on UV-curing of water-based acrylic resins and a mild thermal treatment to form nanosilica in situ from alkoxysilane precursors. Coated and uncoated facing bricks were compared by scanning electron microscopy, surface profilometry, water wettability, and capillary rise tests. The hybrid coatings act as a moderate water repellent; interestingly, no appreciable alteration of the aesthetic properties of the brick was observed, in particular no gloss or color change appeared after the treatment. Note de contenu : - EXPERIMENTAL : Specimen preparation - Analyses and characterization - RESULTS AND DISCUSSION : Characterization of the brick substrate - Characterization of OIH resin - Characterization of treated brick samples compared to the untreated DOI : 10.1007/s11998-015-9758-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9758-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26111 [article]

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Testing organic and organic–inorganic fluorinated hybrid coatings as protective materials for clay bricks / Simonetta Lucia Pagliolico in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 1 (01/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 1 (01/2019) . - p. 81-92 Titre : Testing organic and organic–inorganic fluorinated hybrid coatings as protective materials for clay bricks Type de document : texte imprimé Auteurs : Simonetta Lucia Pagliolico, Auteur ; Elena Daniela Ozzello, Auteur ; Guido Sassi, Auteur ; Roberta Bongiovanni, Auteur Année de publication : 2019 Article en page(s) : p. 81-92 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Argile Briques Capillarité Humidité -- Absorption:Eau -- Absorption Perfluoropolyéther Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : The durability of brickworks, used as facing bricks, parapets, or chimneys, is a crucial aspect of the maintenance of buildings. Water absorption and penetration due to wind-driven rain, water rundown, and capillary rising can cause serious damages and a premature deterioration of porous clay bricks, and a significant increase in their thermal conductivity. Protective coatings for brickwork must provide enhanced hydrophobic properties without affecting moisture regulation and breathability of masonry. In the present work, a standardized type of facing clay brick was treated with two types of hydrophobic coatings based on a commercial perfluoropolyether oligomer containing alkoxysilane terminal groups, respectively, with or without an inorganic precursor, tetraethoxysilane, to generate in situ silica nanoparticles. The performance of the coating was assessed by multiple indicators, such as wetting delay, water absorption coefficient, protection degree by capillarity, contact angle, roughness and gloss, as a function of the amount of coating. Uncertainties analysis of indicators was carried out. Coating performance was assessed at different exposure times comparable to in situ real ones. Optimal amounts of coating were established to maximize the protection with the minimum quantity of polymer. As a result, a square meter of brick surface exposed to water for 2–4 h can absorb about 7–8 L of water. Very small amounts of PFPE coatings change the brick surface/water interactions, more than halving the absorbed water (0.5–2 l) and increasing the protection degree up to 80–100%. After longer exposure times, the reduction in absorbed water is basically higher when brick specimens are treated with organic/inorganic nanostructured hybrid PFPE coatings. Note de contenu : - EXPERIMENTAL : Materials and methods - Characterization of water capillary absorption - Characterization of the bricks surface - RESULTS AND DISCUSSION : Characterization of untreated bricks - Amount of water repellent applied - Characterization of treated specimens - Effectiveness of coatings DOI : 10.1007/s11998-018-0102-3 En ligne : https://link.springer.com/article/10.1007/s11998-018-0102-3 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31967 [article]

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