Biocolorant for leather dyeing applications : an eco-benign evaluation of natural coloring agent / C. Kurinjimalar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 9 (09/2021)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVI, N° 9 (09/2021) . - p. 322-331 Titre : Biocolorant for leather dyeing applications : an eco-benign evaluation of natural coloring agent Type de document : texte imprimé Auteurs : C. Kurinjimalar, Auteur ; Gladstone Christopher Jayakumar, Auteur ; A. Tamil Selvi, Auteur ; Rajangam Venba, Auteur ; Malathy Jawahar, Auteur ; Swarna Vinodh Kanth, Auteur Année de publication : 2021 Article en page(s) : p. 322-331 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse spectrale Caractérisation Colorants végétaux Croûte (cuir) On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés. Cuirs et peaux -- Propriétés organoleptiques Cuirs et peaux -- Teinture Extraction (chimie) Garance et constituants Granulométrie Solidité de la couleur Stabilité thermique Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Exploration of biocolorant in leather industry is explored widely owing to its environmental limitation. Besides, employing synthetic dyes in leather process requires high end of pipe treatment due to their complex chemical structure. Therefore, an attempt has been made on exploiting madder root dye (Rubia cordifolia L.) for leather dyeing application. The effect of varying pretreatment regimen on madder colorant extraction, chemical characterizations (including UV-Vis, IR, particle size, zeta potential value, and thermal studies) and optimum operating leather dyeing conditions are studied. The results revealed dissolving medium pH 5, 100oC, and 60 min duration of extraction is optimum. Thus, obtained dye characteristics showed maximum absorption peak at 460 nm, with an average particle size of 166 nm. It also shows a negative zeta potential value of -5.31 which is indicative for dyeing application. The optimum leather dyeing is found at leather pH 5.5, 10% dye concentration and 4 h duration. At optimum dyeing parameters it shows good fastness, perspiration, organoleptic properties without affecting the physical characteristic. Novelty of the present research would lead to develop eco-dyeing method in leather manufacture. Moreover, the study unravels a new application of eco-benign dye to achieve sustainable process. Note de contenu : - Graphical abstract - MATERIALS AND METHODS : Materials - Optimization on madder dye extraction - Preparation and characterization of madder dye - Spectral characteristics - Thermal property analysis - Leather dyeing application and analysis - RESULTS AND DISCUSSION : Optimization on madder dye extraction - Spectral characteristic analysis - Particle size and stability analysis - Thermal stability analysis - Leather dyeing optimization trials - Effect of concentration (Trial 1) - Effect of pH (Trial 2) - Effect of time (Trial 3) - Effect of mordants (Trial 4) - Grain surface analysis - Characterization of dyed leather - Color fastness analysis - Organoleptic properties analysis - Table 1 : Post-tanning procedure for dyeing using madder dye - Table 2 : Color value analysis of crust leather dyed using madder dye - Table 3 : Organoleptic and fastness properties of crust leather dyed using madder dye DOI : https://doi.org/10.34314/jalca.v116i9.4397 En ligne : https://drive.google.com/file/d/1rlk3HayVEXpRVU8p3Wop0diFyOqa6Xfd/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36404 [article]

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Dry colour prediction of leather from its wet state / Malathy Jawahar in COLORATION TECHNOLOGY, Vol. 129, N° 4 (08/2013)  

[article]  inCOLORATION TECHNOLOGY > Vol. 129, N° 4 (08/2013) . - p. 252–258 Titre : Dry colour prediction of leather from its wet state Type de document : texte imprimé Auteurs : Malathy Jawahar, Auteur ; Rajangam Venba, Auteur ; Govindhan Jyothi, Auteur ; Swarna Vinodh Kanth, Auteur ; Mallinath Jinandra Doss, Auteur ; Chandra Babu Narasimhan Kannan, Auteur Année de publication : 2013 Article en page(s) : p. 252–258 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie Cuir -- Séchage Cuirs et peaux -- Teinture Spectroscopie de réflectance Tags : 'Cuir  sec'  mouillé'  'Modèle  régression'  'Teinture  cuir'  Séchage  'Spectroscopie  réflectance' Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The present investigation describes the development of a regression model for dry colour prediction based on the colour of wet leather. Such a prediction will be useful in the colour matching of leather – the time delay in drying of wet leather and determination of the final colour can be avoided. The use of computer technology interfaced with a reflectance spectrophotometer provides a novel approach to the prediction of dry colour from wet colour. In this study, five different regression models, i.e. linear fit, log fit, quadratic fit, log quadratic fit and cubic fit, were developed, with the dry reflectance of the leather sample as a dependent variable and the wet reflectance of the leather as an independent variable. The relationship between moisture content and surface leather colour, a prerequisite for enabling prediction, was studied. The obtained log quadratic model can be used for accurate prediction of dry colour from wet colour. DOI : 10.1111/cote.12033 En ligne : http://onlinelibrary.wiley.com/doi/10.1111/cote.12033/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19036 [article]

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