Development of natural colours in Cr-Fe tanned garment leathers / J. R. Rao in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 86, N° 3 (05-06/2002)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 86, N° 3 (05-06/2002) . - p. 106-111 Titre : Development of natural colours in Cr-Fe tanned garment leathers Type de document : texte imprimé Auteurs : J. R. Rao, Auteur ; Palanisamy Thanikaivelan, Auteur ; J. Malathi, Auteur ; R. Rajaram, Auteur ; Balachandran Unni Nair, Auteur Année de publication : 2002 Article en page(s) : p. 106-111 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acacia et constituants chataigner et constituants Chrome Colorimétrie 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 physiques Cuirs et peaux -- Teinture Fer Myrobalan et constituants Quebracho Le quebracho est un arbre à écorce ligneuse, mesurant 30 mètres de haut, à feuilles tannées et à fleurs tubulées blanches. Quebracho est l'un des noms communs, en espagnol, d'au moins trois espèces similaires d'arbres originaires du Gran Chaco, en Amérique latine : Schinopsis lorentzii (quebracho colorado santiagueño), de la famille des Anacardiaceae ; Schinopsis balansae (quebracho colorado chaqueño), de la même famille ; Aspidosperma quebracho-blanco (quebracho blanc), de la famille des Apocynaceae. Ces trois espèces sont riches en tanin et fournissent un bois très dur, particulièrement résistant. Leur nom provient de l'espagnol quiebrahacha, qui signifie brise-hache. Réflectance Résistance à l'abrasion Tanins végétaux Tannage minéral Tannage dans lequel interviennent différents minéraux. Le plus répandu est le tannage aux sels de chrome, mais aussi à l’aluminium Vêtements en cuir Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Dyes based on synthetic formulations are widely used in the leather industry, however, many aryl amine dyes are restricted due to their carcinogenic nature. Environmental concern leads one to look for the dye products based on natural resources, which may have advantages of biodegradability and lower toxicity. We aimed to create an eco-friendly dyeing process by forming in-situ complexes between vegetable tannins and the Cr-Fe tanning salt, where the use of iron salts results in various colours on reaction with various vegetable tannins. Sheepskins were tanned using the Cr-Fe tanning salt and treated with various vegetable tanning materials, brown, black and grey shades were developed. The shades obtained have been quantified by reflectance measurements and compared by visual assessment. Strength characteristics of the leathers treated with 5% vegetable tannins are higher than those treated with 1% tannins, bulk properties not being affected with the increase in concentration from 1 to 5%. The light, wet and dry rub fastness of the naturally coloured leathers are good with no change on ageing. Colour reproduction at bulk level production is acceptable with minor batch variations. Note de contenu : - EXPERIMENTAL DETAILS : Process details for larger scale trials - Physical testing - RESULTS AND DISCUSSION : Wattle - Chestnut - Myrobalan - Quebracho - Environmental Perception - Table 1 : Percentage reflectance measurement for garment leathers coloured with various concentrations of wattle - Table 2 : Visual assessment data of the garment samples treated with various concentrations of wattle (Grade points 0-poor and 10-very good) - Table 3 : Visual assessment data of the garment samples treated with various concentrations of chestnut (Grade points 0-poor and 10-very good) - Table 4 : Visual assessment data of the garment samples treated with various concentrations of myrobalan (Grade points 0-poor and 10-very good) - Table 5 : Percentage reflectance measurement for garment leathers coloured with various concentrations of quebrancho - Table 6 : Visual assessment data of the garment samples treated with various concentrations of quebracho (Grade points 0-poor and 10-very good) - Table 7 : Strength characteristics for various crust garment leathers - Table 8 : Visual assessment data for garment leathers treated with selected concentrations of vegetable tannins - Table 9 : Fastness of the naturally coloured leathers treated with selected concentration of vegetable tannins to wet, dry rubbing and artificial light - Table 9 : Comparison of colour measurements data between the sample and bulk colouration of leathers using selected concentration vegetable tannins En ligne : https://drive.google.com/file/d/1cy6baDBVvluD26gKPLzG7iFzZjo83l1w/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39924 [article]

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire

Sustainable finished leather preservation / Ruby Shekinah in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 2 (02/2024)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 2 (02/2024) . - p. 55-63 Titre : Sustainable finished leather preservation : Part I - Myrobalan capped copper nanoparticles Type de document : texte imprimé Auteurs : Ruby Shekinah, Auteur ; Saranya Kailasam, Auteur ; Sujata Mandal, Auteur ; Swarna Vinodh Kanth, Auteur Année de publication : 2024 Article en page(s) : p. 55-63 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens Cuirs et peaux -- Conservation Cuirs et peaux -- Finition Cuivre Formulation (Génie chimique) Myrobalan et constituants Nanoparticules Nanoparticules -- Synthèse Produits de conservation du cuir Réduction (chimie) Revêtements Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Copper nanoparticles were synthesized using myrobalan (tannin) extract as a reducing agent. The synthesized nanoparticles were used in the coating of leather after the finishing process of upper leather to enhance the antimicrobial properties of leather. Primarily, the synthesized myrobalan copper nanoparticles (M-CuNPs) were characterized using UV-Spectroscopy (UV), which resulted in an absorption peak at 412 nm, confirming the presence of CuNPs in the solution. The size distribution and zeta potential values of M-CuNPs were analyzed by Dynamic Light Scattering (DLS) which resulted in an average particle size of 104 nm and zeta potential value of -28mv. These values affirm the stability of the M-CuNPs. Scanning Electron Microscope (SEM) image showed that the particles are spherical in shape. The elemental composition of M-CuNPs was confirmed using Energy dispersive X-ray (EDX) studies. Fourier transform infrared (FTIR) spectra showed peaks at 3173 cm-1, 1727 cm-1, 1147 cm-1, and 624 cm-1, which correspond to -OH, C=O, C-O, and C-H respectively confirming functional groups involved in the synthesis and capping process. The antibacterial activity of the M-CuNPs coated finished leather was evaluated against Grampositive (Bacillus subtilis) and Gram-negative (Serratia marcescens) bacteria, which are common pathogenic species that effect the preservation capabilities of the leather. The M-CuNPs coated finished leather exhibits strong antimicrobial activity against both Gram-positive (Bacillus subtilis) and Gram-negative (Serratia marcescens) bacteria. Hence from the above study, M-CuNPs can be used as a sustainable antibacterial agent for preserving leather and its products. Note de contenu : - MATERIALS AND METHOD : Materials - Preparation of tannin extraction - Synthesis of M-CuNPs - Characteristics of M-CuNPs - Methodology of leather nanocoatings - Antibacteial assay of M-CuNPs - Effect of copper nanoparticles on growth of bacteria - Antibacterial evaluation of M-CuNPs coated leather - RESULTS AND DISCUSSION : Antibacterial activity of M-CuNPs - Antibacterial mechanism of copper nanoparticles - Table 1 : Resin finish formulation - Table 2 : Antibacterial activity of the synthesized M-CuNPs DOI : https://doi.org/10.34314/jalca.v119i2.8322 En ligne : https://drive.google.com/file/d/1Sj4vOJh9ztiOGhfz1DgCXCot8I0WENEA/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40465 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
24447	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Ultrasound assisted vegetable tannin extraction from myrobalan nuts for leather application / Venkatasubramanian Sivakumar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 2 (02/2018)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 2 (02/2018) . - p. 53-58 Titre : Ultrasound assisted vegetable tannin extraction from myrobalan nuts for leather application Type de document : texte imprimé Auteurs : Venkatasubramanian Sivakumar, Auteur ; A. Princess, Auteur ; C. Veena ; R. Lakshmi Devi Année de publication : 2018 Article en page(s) : p. 53-58 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Eau Essais (technologie) Extraction par solvant Extraction par ultrasons Myrobalan et constituants Tanins végétaux Tannage végétal -- Analyse Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Ultrasound (US) assisted preparation of tannins from Terminalia Chebula nuts (myrobalan) through solid-liquid extraction process using water as solvent even dispensing with conventional heating/stirring is presented in this paper. The results indicate there is a significant enhancement in myrobalan extraction due to the influence of US, in extract %yield and tannin contents respectively as compared to different control processes (static/stirring). Whereas, ultrasound probe at 120 W in 50°C water bath gave the best overall %yield and tanning content. Some of the important scale-up parameters could be a significant savings of 427,184 and 188 kg per ton of raw material usage as extrapolated values based on Lab-scale results in terms of % yield, tannin content and tanning agent offer respectively due to the use of US as compared to control process. The process involves : i). Clean technology with physical activation (US) in aqueous medium at ambient condition - no additional chemicals ii). Green and Eco-benign process with natural materials - useful in all extract applications, iii. Tannins extract as generic product for better functional properties, iv). Better diffusion of plant extract through skin matrix in tanning process for leather making, v). Sustainable solution and ecoconservation through better yields Note de contenu : - EXPERIMENTAL : Experimental Set up - Experimental Procedure - Tanning Trials - Analytical methods - Quantitative analysis of tannin content - RESULTS AND DISCUSSIONS : Myrobalan extraction in ultrasonic tank - Effect of extraction in US probe - Effect of US power, temperature and stirring in extration - Enhancement factors for myrobalan extraction with ultrasound - Effect of distance of material from US probe tip - Mechanism tor the ultrasound assisted extraction - Two-stage extraction - Efficacy of extract in tanning process - Experimental results and process scale-up considerations En ligne : https://drive.google.com/file/d/1Nfgs9Mp-HnCkG6Q4zlf4t-oXsI-oBK3b/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29951 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
19539	-	Périodique	Bibliothèque principale	Documentaires	Disponible

---

1 (1 - 3 / 3)