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Green chemistry approach in leather processing : a case of chrome tanning / Marimuthu Pradeep Kumar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 4 (04/2011)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 4 (04/2011) . - p. 113-120 Titre : Green chemistry approach in leather processing : a case of chrome tanning Type de document : texte imprimé Auteurs : Marimuthu Pradeep Kumar, Auteur ; Rathinam Aravindhan, Auteur ; Kalarical Janardhanan Sreeram, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur Année de publication : 2011 Article en page(s) : p. 113-120 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chimie écologique Ethanolamine L'éthanolamine, également appelée 2-aminoéthanol ou monoéthanolamine, est un composé chimique organique qui est à la fois une amine primaire (par son groupe amine) et un alcool primaire (par son groupe hydroxyle). À l'instar des autres amines, la monoéthanolamine se comporte en base faible. L'éthanolamine est un liquide toxique, inflammable, corrosif, incolore et visqueux ; son odeur est similaire à celle de l'ammoniac. Liqueurs de tannage Picklage Le picklage consiste à faire absorber à la peau en tripe une quantité importante d'acide, en présence de sel neutre (NaCl) pour réprimer le gonflement que provoquerait l'acidité du milieu. Tannage au chrome Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The leather industry, world over, has adopted several new practices as a part of their green initiative. In this study the chrome tanning process, one of the most important steps in leather making, was evaluated for its ‘greenness’. The prominent tool employed for assessing greenness for an industrial process, atom economy (the conversion efficiency of a chemical process in terms of all atoms involved) was studied for the first time for four types of chrome tanning processes: direct chrome liquor recycle (DCLR), ethanolamine-assisted, pickleless chrome tanning, and conventional chrome tanning. All chemicals involved in the reaction with skin protein were taken into consideration for the computation of overall atom economy. An atom economy of only 29% was obtained for the conventional chrome tanning system. Among the four improved methods of chrome tanning evaluated, the pickleless chrome tanning method provides the maximum atom economy of about 57% followed by ethanolamine and DCLR, having atom economies of 42 and 32%, respectively. Note de contenu : - EXPERIMENTAL METHODS : Materials and methods - Analysis of leather and spent liquors - RESULTS AND DISCUSSION : Atom economy for conventional chrome tanning process - Atome economy of various chrome management systems En ligne : https://drive.google.com/file/d/1sXASKYo0y5hG3KXknuDDD0qwnOypMpdd/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11313 [article]

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Dyeing/cross-linking property of natural iridoids to protein fibers / Baoqin Zhang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 4 (04/2011)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 4 (04/2011) . - p. 121-126 Titre : Dyeing/cross-linking property of natural iridoids to protein fibers : Part I. Preparation of four natural iridoids and their dyeing/cross-linking (tanning) property to hide power Type de document : texte imprimé Auteurs : Baoqin Zhang, Auteur ; Loujin Xu, Auteur ; Keyi Ding, Auteur Année de publication : 2011 Article en page(s) : p. 121-126 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Teinture Iridoïdes Résonance magnétique nucléaire Spectrométrie de masse Tannage Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Four iridoid compounds, genipin, loganin aglycone, oleuropein aglycone and E-6-O-methoxycinnamoyl scandoside methyl ester aglycone were prepared from Gardenia jasminoides Ellis, Lonicera japonica Thunb, Olea europaea Linn and Hedyotis diffusa (Willd) Roxb respectively, their structures were identified by electron spray ionization-mass spectrometry (ESI-MS), 1H NMR and 13C NMR. Their dyeing/tanning properties on hide powder was investigated, the relationship between dyeing/cross-linking (tanning) property and the chemical structures were discussed. The results showed that these four natural iridoids could react with hide powder under mild conditions (35?, pH=7.5-8.0), within a short time (about 6 h) and at a low dosage (5% (w/w) of hide powder). The hydrothermal stability of the reacted hide powder was 20-25°C higher than the control sample, and different colors, such as dark blue, brown-yellow, yellow and mauve, were imparted to hide powder. The mechanism might be that cross-linking reaction took place between iridoids and –NH2 groups of collagen molecular chains. These results implied that natural iridoids might act as completely novel “natural reactive dyes”, especially for protein fibers and offering environmental-friendly simultaneous tanning-dyeing agents for leather manufacture. Note de contenu : - EXPERIMENTAL : Materials - Preparation and identification of iridoid glucosides (preparation and identification of loganin - Preparation and identification of geniposide, oleuropein and E-6-O-methoxycinnamoyl scandoside methyl ester - Preparation of iridoid aglycones by hydrolysis - Tanning and dyeing experiment). - Analytical procedures : Determination of thermal stability - Stability of iridoid aglycones in phosphate buffered saline (PBS) - reaction analysis between genipin and BSA via SDS-PAGE RESULT AND DISCUSSION : The chemical structures of four iridoid glycosides - Tanning and dyeing properties of iridoids on hide powder - the dyeing/tanning mechanism of iridoids to hide powder iridoid stability in PBS : Analysis by SDS-PAGE for the reaction between genipin and BSA. En ligne : https://drive.google.com/file/d/12fkr42u_e6_nxZOrWmSXHcUGFOuYPjiz/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11314 [article]

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Automated clean leather dyeing assisted by wringing, ultrasound and microwave / Ying Gong in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 4 (04/2011)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 4 (04/2011) . - p. 127-132 Titre : Automated clean leather dyeing assisted by wringing, ultrasound and microwave Type de document : texte imprimé Auteurs : Ying Gong, Auteur ; Kang Cheng, Auteur ; Tao Zhang, Auteur ; Wuyong Chen, Auteur Année de publication : 2011 Article en page(s) : p. 127-132 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Teinture Diffractométrie de rayons X Micro-ondes Microscopie électronique à balayage Ultrasons Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A “clean” leather dyeing was designed with wringing (8-10 kg/cm2), ultrasound (28 kHz, 2.4 W/cm2) and microwave (2450 MHz, 10 W/L). Twenty leathers samples were successively colored with this method in a laboratory scale trial. The dye exhaustion (%), the color values and the color rub fastnesses were determined. Also, the grain surface and the cross-section of the leathers were analyzed before and after dyeing. As presented, it only required 5 minutes to color with this method and the dye exhaustions averaged 2.3%, helpful for the recycling of the dye solution. The color for the test group of ten leathers varied within a small range ( ?E <1) when the solution was directly recycled without dye replenishment. The color fastnesses reached as much as the 4-5 dry rub scale and 3 wet rub scale after the leathers were coated with a typical shoe upper finishing formula. Furthermore, the grain and the collagen fibers were not significantly damaged during the dyeing process as demonstrated by Scanning Electron Microscope and X-ray diffraction analysis. In summary, this clean and quick dyeing could be considered a potential option for leather dyeing. Note de contenu : - EXPERIMENTAL : Materials - experimental set-up - Leather dyeing - Analysis methods : analysis of dye exhaustion - determination of color difference : Determination of fastness to wet and dry rub - scanning electron microscopc study (SEM) - X-ray diffraction study (XRD) - RESULTS AND DISCUSSION : Dye exhaustion - color measurements and fastnesses - SEM analysis - XRD analysis. En ligne : https://drive.google.com/file/d/1CQ_v-nJ9ZzVIL7AXa72ZpxuKiLDcpZRP/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11315 [article]

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The subjective measurement of leather handle by descriptive sensory analysis / Y. Wang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 4 (04/2011)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 4 (04/2011) . - p. 133-140 Titre : The subjective measurement of leather handle by descriptive sensory analysis Type de document : texte imprimé Auteurs : Y. Wang, Auteur ; Geoffrey E. Attenburrow, Auteur ; P. Picton, Auteur ; S. Turner, Auteur Année de publication : 2011 Article en page(s) : p. 133-140 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse sensorielle Cuir Imagerie tridimensionnelle Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leather handle strongly relates to leather quality, and in the leather industries experts still manually assess it. In this paper a new approach, Descriptive Sensory Analysis, was applied when subjectively measure leather handle and thus a comprehensive handle profile was established. Ten attributes of leather samples were identified and quantified by a trained expert panel according to agreed procedures. Principal Component Analysis was used to reduce data dimensionalities and a conception 3D handle space was proposed and demonstrated to exhibit the handle attributes of leather. Note de contenu : - EXPERIMENTS : Screening - Training (Terminology glossary - Attribute list - Scaling technique - Questionnaire - sample preparation) - Handling. - DISCUSSION : Principal component analysis - 3D handle space. En ligne : https://drive.google.com/file/d/1GxYi2BYJEq312TXXKPDB4SRDDZlWYE2J/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11316 [article]

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