Improving the photostability of bleached silk without reducing its whiteness / Wang Zongqian in COLORATION TECHNOLOGY, Vol. 131, N° 6 (12/2015)  

[article]  inCOLORATION TECHNOLOGY > Vol. 131, N° 6 (12/2015) . - p. 439-443 Titre : Improving the photostability of bleached silk without reducing its whiteness Type de document : texte imprimé Auteurs : Wang Zongqian, Auteur ; Weiguo Chen, Auteur ; Xuewei Zhou, Auteur ; Chaonan Liu, Auteur ; Keith R. Millington, Auteur Année de publication : 2015 Article en page(s) : p. 439-443 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorbeurs de rayonnement ultraviolet Blanchiment Chimie textile Photoabsorption Photostabilité Soie et constituants Index. décimale : 667.3 Teinture et impression des tissus Résumé : Bleached silk is rapidly yellowed by exposure to the ultraviolet radiation present in sunlight. The conventional application of a water-soluble hydroxyphenyl benzotriazole ultraviolet absorber (such as UVFast W) to bleached silk reduces its rate of photoyellowing but has a negative impact on the whiteness of the bleached silk, largely cancelling out the improvements in whiteness achieved during bleaching. Therefore, a series of bleaching processes and aftertreatments using UVFast W on silk were investigated, with the measurement of reflection spectrum, whiteness, yellowness, and strength before and after exposure to ultraviolet radiation. The results show that whiteness of silk treated by oxidation–reduction double bleaching can be increased, and the whiteness of double-bleached silk with 4% UVFast W aftertreatment was even slightly higher than that of the hydrogen-peroxide-bleached silk. After ultraviolet irradiation, double-bleached silk samples with 4% UVFast W treatment resulted in both the highest whiteness and optimum photostability by comparison with unbleached standard silk and hydrogen-peroxide-bleached silk samples with and without 4% UVFast W treatment, and its strength difference was superior to the samples, except for standard silk with 4% UVFast W treatment after exposure to UV radiation for 18 h. Note de contenu : - EXPERIMENTAL : Materials - Oxidative bleaching with hydrogen peroxide - UVFast W treatment process for unbleached and hydrogen-peroxide-bleached silk - UVFast W treatment from a reductive bleach bath - Photostability testing - Yellowness measurement - Whiteness measurement - Colour measurement - Breaking strength test - RESULTS AND DISCUSSION : Colour values of silk and hydrogen-peroxide-bleached silk with and without UVFast W treatment - Colour values of double-bleached silk with and without UVFast W treatment - Photostability of silk and bleached silk with and without UVFast W treatment DOI : 10.1111/cote.12185 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12185 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25090 [article]

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