Adsorption behaviour of carbon black/latex by cationised cotton fabrics / Chunxia Wang in COLORATION TECHNOLOGY, Vol. 131, N° 6 (12/2015)  

[article]  inCOLORATION TECHNOLOGY > Vol. 131, N° 6 (12/2015) . - p. 644-450 Titre : Adsorption behaviour of carbon black/latex by cationised cotton fabrics Type de document : texte imprimé Auteurs : Chunxia Wang, Auteur ; Benjamin Tawiah, Auteur ; Rongrong Cui, Auteur ; Liping Zhang, Auteur ; Shaohai Fu, Auteur Année de publication : 2015 Article en page(s) : p. 644-450 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption Cationisation 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). Dispersions et suspensions Latex Noir de carbone Polymérisation en émulsion Teinture -- Fibres textiles Index. décimale : 667.3 Teinture et impression des tissus Résumé : A carbon black/latex dispersion was prepared by mini-emulsion polymerisation, and its absorption behaviour towards cationised cotton fabric was investigated. The results indicated that the prepared carbon black/latex dispersion had excellent freeze–thaw stability. Cotton fabric that was cationised with 3 g/l of 3-chloro-2-hydroxypropyltrimethyl ammonium chloride at a liquor ratio of 30:1 can be optimally dyed with 4% owf carbon black/latex under the conditions of pH 7.2, 60 °C, and 1 h. The adsorption behaviour of the carbon black/latex towards cationised cotton fabric followed the Langmuir adsorption isotherm, with a lower dyeing rate and a better colour levelness than the ordinary carbon black dispersion with binder. Note de contenu : - EXPERIMENTAL : Materials - Preparation of the carbon black/latex dispersion - Dyeing of cotton fabric - Characterisation of the carbon black/latex dispersion - Colour performance of the dyed cotton fabric - RESULTS AND DISCUSSION : Properties of the carbon black/latex dispersion - Dyeing conditions - Adsorption behaviour of the carbon black/latex towards cationised cotton fabrics - Properties of dyed cotton fabrics DOI : 10.1111/cote.12186 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12186 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25091 [article]

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An overview of the science and art of encapsulated pigments : Preparation, performance and application / Benjamin Tawiah in COLORATION TECHNOLOGY, Vol. 138, N° 3 (06/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 3 (06/2022) . - p. 224-247 Titre : An overview of the science and art of encapsulated pigments : Preparation, performance and application Type de document : texte imprimé Auteurs : Benjamin Tawiah, Auteur ; Benjamin K. Asinyo, Auteur ; Charles Frimpong, Auteur ; Ebenezer K. Howard, Auteur ; Raphael K. Seidu, Auteur Année de publication : 2022 Article en page(s) : p. 224-247 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Complexation (chimie) Couches minces multicouches Dispersions et suspensions Encapsulation Essais (technologie) Evaluation Pigments Polymérisation Séparation de phases Sol-gel, Procédé Index. décimale : 667.2 Colorants et pigments Résumé : A successfully encapsulated pigment requires dispersants, pigment and a dispersion medium to build a thin layer of polymer over individual pigment particles. The stability of encapsulated dispersion is aided by the absorption of stabilising molecules on the surface. The stabilising molecules function by steric hindrance or Coulomb-repulsion forces, which prevent the encapsulated pigments from advancing too close to each other for attractive forces to cause agglomeration. Unlike flocculation, agglomeration results in a cementitious network structure that is not easily redispersed by shear forces, hence the need for effective dispersion of encapsulated pigment intended for engineering applications. Besides dispersion forces, the quality of pigment dispersion, the pigment particle size, pigment density, viscosity of the dispersion, and the method of producing the pigment microcapsules, also affect the efficiency and the quality of encapsulated pigment dispersions. This article, therefore, provides up-to-date information on the various pigment encapsulation methods (with specific emphasis on phase separation, in situ polymerisation, emulsion and mini-emulsion polymerisation, the sol-gel method, inclusion complexation and layer-by-layer assembly), and also reviews the performance, the evaluation/test methods and applications of encapsulated pigments. This review provides important insight into the science and art of encapsulated pigment preparation for pigment dispersion technologists, researchers and consumers of pigment products in different fields of endeavour. Note de contenu : - METHODS OF ENCAPSULATION : Preparation of encapsulated pigment dispersion - Physico-chemical methods - Chemical methods - INCLUSION COMPLEXATION - PERFORMANCE OF ENCAPSULATED PIGMENT DISPERSIONS : Stability - Rheological behavior - COLOUR PERFORMANCE OF ENCAPSULATED PIGMENT DISPERSION - EVALUATION METHODS FOR ENCAPSULATED PIGMENT DISPERSION - APPLICATIONS OF ENCAPSULATED PIGMENT DISPERSION : Emerging applications of encapsulated pigments - Table 1 : Encapsulation methods suitable for different ranges of capsule size - Table 2 : Selected studies in in situ polymerisation - Table 3 : Advantages and limitations of some conventional encapsulation methods applicable different types of pigments - Table 4 : Test methods for evaluating encapsulated pigment dispersion - Table 5 : Application of encapsulated pigments DOI : https://doi.org/10.1111/cote.12597 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12597 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37853 [article]

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Facile synthesis of a cardanol-based levelling agent as a biodegradable alternative to tristyrylphenol ethoxylates for the dyeing of polyester fabric / Kun Chen in COLORATION TECHNOLOGY, Vol. 138, N° 3 (06/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 3 (06/2022) . - p. 266-277 Titre : Facile synthesis of a cardanol-based levelling agent as a biodegradable alternative to tristyrylphenol ethoxylates for the dyeing of polyester fabric Type de document : texte imprimé Auteurs : Kun Chen, Auteur ; Jiefang He, Auteur ; Benjamin Tawiah, Auteur ; Xiangdong Zhou, Auteur ; Yuyang Zhou, Auteur Année de publication : 2022 Article en page(s) : p. 266-277 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Cardanol Éthoxylation alcools et phénols, généralement pour produire de puissants agents surfactants ou mouillants. Fibres polyesters Oligomères Produits chimiques -- Biodégradation Solidité de la couleur Surfactants -- Suppression ou remplacement Teinture -- Fibres textiles synthétiques Index. décimale : 667.3 Teinture et impression des tissus Résumé : To reduce the overdependence on petroleum-based surfactants for the dyeing of polyester fabrics, a series of biodegradable cardanol-based polyethoxylate oligomers (CPm, m = 5, 7 and 9) were synthesised by ethoxylation of cardanol with ethylene oxide. The synthesised compounds were characterised and confirmed by Fourier Transform–infrared spectroscopy and proton nuclear magnetic resonance spectroscopy. In addition, the physical, biodegradable and dyeing-assisting properties of CPm were evaluated through comparison with tristyrylphenol ethoxylates (A typical commercial surfactant). Results revealed that CPm showed a higher hydroxyl value, better dispersing capability and a higher migration percentage than tristyrylphenol ethoxylates. Specifically, CP5 (0.5 g/L) improved the migration percentage by 12.03% compared with tristyrylphenol ethoxylates. The migration performance of the surfactants followed a descending order of CP5 > CP7 > CP9 > tristyrylphenol ethoxylates. Importantly, CP5 displays a higher degradation propensity than tristyrylphenol ethoxylates, demonstrating its biodegradable merit. In summary, the cardanol-based polyethoxylates synthesised through this research are promising biodegradable and effective alternatives to conventional levelling agents for disperse dyeing, which contributes a new strategy to the sustainable development of the textile industry. Note de contenu : - EXPERIMENTAL : Materials - Synthesis - Characterisations - Dyeing process - RESULTS AND DISCUSSION : Characterisations of CPm - Dyeing performance - Table 1 : Physical properties and surface activity of the CP series and TSPEOs - Table 2 : Biodegradation capabilities of CP5 and TSPEOs - Table 3 : Colour fastness of dyed fabric using CP5 and TSPEOs DOI : https://doi.org/10.1111/cote.12588 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12588 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37856 [article]

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