| Titre : |
Photoinduced hydrophilicity and self-cleaning characteristics of silicone-modified soya alkyd/TiO2 nanocomposite coating |
| Type de document : |
texte imprimé |
| Auteurs : |
Sushil S. Pawar, Auteur ; R. Baloji Naik, Auteur ; Sangram K. Rath, Auteur ; T. K. Mahato, Auteur ; Balasubramanian Kandasubramanian, Auteur |
| Année de publication : |
2020 |
| Article en page(s) : |
p. 719–730 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Auto-nettoyage
Caractérisation
Charges (matériaux)
Dioxyde de titane
Formulation (Génie chimique)
Nanoparticules
Photocatalyse
Polyalkydes
Résistance aux conditions climatiques
Revêtements -- Additifs:Peinture -- Additifs
Revêtements organiques
SiliconesLes silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki).
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Nano-TiO2-dispersed polymeric coatings have been extensively studied in recent years owing to their photocatalytic-induced self-cleaning characteristics. However, durability and long-term retention of self-cleaning performance of such coatings remain a challenge for practical applications. In the present work, we report the self-cleaning properties of nano-TiO2/silicone soya alkyd-based coating formulations comprising 0.5–5 wt% of nanofiller as well as conventional additives of rutile TiO2 and BaSO4. The nanocomposites were prepared by an in situ process involving dispersion of nano-TiO2 in soya oil, soya alkyd synthesis by alcoholic process, followed by silicone modification. The coatings prepared from the nanofiller-dispersed resin showed significant UV radiation-induced hydrophilicity and photocatalytic degradation of methylene blue (MB) solution. A coating formulation with 2 wt% of nano-TiO2 loading showed a decrease in water contact angle from 87° to < 10° after 24 h of UV radiation exposure and a 50% decrease in intensity of the 664-nm absorbance peak of MB solution after 8 h of UV irradiation. Further, Fourier transform infrared spectroscopy in reflectance mode (ATR-FTIR) and thermogravimetric analysis (TGA) studies revealed minimal degradation of the host matrix after 500 h of accelerated weathering studies with retention of self-cleaning characteristics. These results imply that silicone-modified alkyd resin can be a suitable host matrix for combining the requisite properties of self-cleaning, organic contaminant degradation, photocatalytic stability, and weathering resistance for sustainable self-cleaning applications. |
| Note de contenu : |
- EXPERIMENTAL DETAILS : Materials - Synthesis of silicone soya alkyd/nano-TiO2 resin - Preparation of paint
- CHARACTERIZATION METHODS
- RESULTS AND DISCUSSION : Photoinduced hydrophilicity and degradation of methylene blue solution - Self-cleaning characteristics Photocatalytic degradation of nanocomposite coating |
| DOI : |
https://doi.org/10.1007/s11998-019-00253-y |
| En ligne : |
https://link.springer.com/content/pdf/10.1007/s11998-019-00253-y.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34102 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 3 (05-06/2020) . - p. 719–730
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