The effect of iron mordanting and sol-gel coating on the hydrophobicity and colour properties of cotton fabrics dyed with natural tannin / Penwisa Pisitsak in COLORATION TECHNOLOGY, Vol. 137, N° 2 (04/2021)  

[article]  inCOLORATION TECHNOLOGY > Vol. 137, N° 2 (04/2021) . - p. 145-153 Titre : The effect of iron mordanting and sol-gel coating on the hydrophobicity and colour properties of cotton fabrics dyed with natural tannin Type de document : texte imprimé Auteurs : Penwisa Pisitsak, Auteur Année de publication : 2021 Article en page(s) : p. 145-153 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Coton Le coton est une fibre végétale qui entoure les graines des cotonniers "véritables"(Gossypium sp.), un arbuste de la famille des Malvacées. Cette fibre est généralement transformée en fil qui est tissé pour fabriquer des tissus. Le coton est la plus importante des fibres naturelles produites dans le monde. Depuis le XIXe siècle, il constitue, grâce aux progrès de l'industrialisation et de l'agronomie, la première fibre textile du monde (près de la moitié de la consommation mondiale de fibres textiles). Hydrophobie Mordançage (teinture) Organosilanes Rouge (couleur) Sels métalliques Sol-gel, Procédé Sulfate de fer Tanins Teinture -- Fibres textiles Teinture au tampon Index. décimale : 667.3 Teinture et impression des tissus Résumé : Cotton fabrics were dyed with natural tannin and post-treated with a metallic salt mordant and/or sol-gel coating. The effects on colour properties and hydrophobicity were studied. Pad-dyeing was carried out using a reddish-brown, tannin-rich dye. Some samples were then post-mordanted with iron(II) sulphate. Samples were sol-gel coated using tetraethyl orthosilicate (TEOS) with small amounts of organically modified alkoxysilane precursors phenyltriethoxysilane (PHY) and n-octyltriethoxysilane (OCT) to impart hydrophobicity, and with 3-(glycidoxypropyl)-trimethoxysilane (GLY) to improve adhesion between the coating and the fabric. The colour parameters were analysed in the CIELab colour space. Dyed samples appeared reddish-brown, with the exception of those post-mordanted with iron(II) sulphate, which were dark brown. Sol-gel coating with hydrophobic alkyltriethoxysilanes (PHY or OCT) increased the hydrophobicity of the undyed fabrics, increasing contact angle values and drop absorption times. However, this hydrophobic sol-gel coating alone failed to impart hydrophobicity to the dyed fabrics. Post-mordanting with iron(II) sulphate was more effective in improving the hydrophobicity of the dyed fabrics than sol-gel coating. Only the dyed sample treated with both iron(II) sulphate and OCT completely prevented absorption of water droplets. Sol-gel coating was found to improve colour fastness to washing, light, and crocking. Post-mordanting with iron(II) sulphate improved colour fastness to washing and light, but not to crocking. DOI : https://doi.org/10.1111/cote.12514 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12514 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36074 [article]

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