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Sustainable finished leather preservation / Ruby Shekinah in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 2 (02/2024)
[article]
Titre : Sustainable finished leather preservation : Part II - Wattle tannin 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 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acacia et constituants
Antibactériens
Caractérisation
Cuirs et peaux -- Conservation
Cuivre
Extraction (chimie)
Nanoparticules -- Synthèse
Produits de conservation du cuir
Tanins végétauxIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Part 1 of the current paper described the green synthesis of myrobalan capped copper nanoparticles for the preservation of the finished leather. In Part II of the current study, Copper Nanoparticles (CuNPs) were synthesized using green synthesis with wattle (tannin) extract as a reducing agent. Green synthesis is the preferred approach for the synthesis of metal nanoparticles due to its eco-friendly and cost-effectiveness for the preservation of finished leather. To improve the antibacterial qualities of leather with different types of finishes, the resin finished leather was coated with synthesized wattle copper nanoparticles (W-CuNPs). The chemical constituents of wattle induce the reduction of Cu2+ ions to CuNPs with the capping process and also remain as a stabilizing agent for the capping process. The formation of W-CuNPs was confirmed by UV-Spectroscopy at an absorbance of 467 nm. The identified functional groups such as -OH, C=C, and C-N were analyzed by Fourier transform infrared spectrum (FT-IR) which are responsible for the reduction and stabilization of copper nanoparticles. The spherical shape of the nanoparticles was ascertained by Scanning Electron Microscope (SEM), whereas Energy dispersive X-ray (EDX) studies confirmed the presence of copper with 65%. The average particle size of W-CuNPs was found to be 96 nm. The zeta potential value of -24 mv affirmed the stability of the W-CuNPs. The maximum zone of inhibition was 12 mm against Gram-positive (Bacillus subtilis) and 11 mm against Gram-negative (Serratia marcescens) bacteria on W-CuNPs coated finished leather, which exhibits strong antimicrobial activity. Hence, CuNPs synthesized by wattle extract have the potential to preserve the finished leather and its products as an antibacterial agent. Note de contenu : - MATERIALS AND METHODS : Preparation of tannin extraction - Synthesis of W-CuNPs - Characterization of W-CuNPs - Methodology of leather nanocoatings - Antibacterial assay of W-CuNPs and W-CuNPs coated leather - Effect of copper nanoparticles on growth of bacteria
- RESULTS AND DISCUSSION : UV-visible spectroscopy of w-CuNPs - Particle size distribution of W-CuNPs - Functional group analysis of W-CuNPs - Morphology and size of W-CuNPs - Antibacterial activity of W-CuNPs
- Table 1 : Antibacterial activity of the synthesized W-CuNPsDOI : https://doi.org/10.34314/jalca.v119i2.8323 En ligne : https://drive.google.com/file/d/1HvhiGDIyGSW4y29rKyK9k40TsJzHnT_O/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40466
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 2 (02/2024)[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24447 - Périodique Bibliothèque principale Documentaires Sorti jusqu'au 14/05/2024 Sustainable metal-free leather manufacture via synergistic effects of triazine derivative and vegetable tannins / Yuanhang Xiao in COLLAGEN AND LEATHER, Vol. 5 (2023)
[article]
Titre : Sustainable metal-free leather manufacture via synergistic effects of triazine derivative and vegetable tannins Type de document : texte imprimé Auteurs : Yuanhang Xiao, Auteur ; Jiajing Zhou, Auteur ; Chunhua Wang, Auteur ; Jinwei Zhang, Auteur ; Vera D. Radnaeva, Auteur ; Wei Lin, Auteur Année de publication : 2023 Article en page(s) : 13 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acacia et constituants
Caractérisation
Coût
Cuirs et peaux -- Propriétés organoleptiques
Cuirs et peaux -- Propriétés physiques
Déchets -- Réduction
Eaux usées -- Analyse
Environnement -- Etudes d'impact
Produits chimiques -- Consommation -- Réduction
Synergie
Syntans
Tanins végétaux
Tannage combinéLe tannage combiné se dit des tannages qui allient deux familles ou genre de tannage pour obtenir un résultat additionnant les qualités complémentaires des tannins mis en œuvre par exemple Chrome-Végétal ou Chrome-Synthétique
Tannage métal free
Tannage synthétique
Tannage végétal
TriazineUne triazine est l'un des trois isomères du composé organique constitué d'un hétérocycle aromatique de six atomes, dont trois de carbone et trois d'azote. Chacune a donc pour formule C3H3N3.
La structure de la triazine est hétérocycle aromatique, analogue au cycle à six atome du benzène, mais avec trois atomes de carbone remplacés par des atomes d'azote. Les trois isomères correspondent donc aux emplacements respectifs des atomes de carbone et d'azote sur le cycle. On compte ainsi la 1,2,3-triazine, la 1,2,4-triazine, et la 1,3,5-triazine. Les autres hétérocycles aromatiques courant contenant de l'azote sont les azines (en particulier la pyridine) qui contiennent un atome d'azote, les diazines qui contiennent deux et les tétrazines qui en contiennent quatre.
Les triazines sont des bases faibles, plus faibles que la pyridine.Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Restrictions on heavy metals, especially chromium, have encouraged alternative tanning systems that can reduce environmental and human health risks from conventional chrome-based tanning. In this work, metal-free combination tanning was developed by using vegetable tannins and a triazine-based syntan containing active chlorine groups (SACC). Specifically, the relationship between leather performance (e.g., hydrothermal stability and organoleptic properties) and technical protocols (e.g., types and dose of tannins) was systematically established. The optimized protocol involving a unique procedure (i.e., 10% SACC pre-tanning, shaving, and 25% wattle tanning) endowed the leather with high shrinkage temperature (~ 92 °C) and met the Chinese standards for shoe upper leather (QB/T 1873-2010). Our method not only produces zero chrome-containing solid wastes, but also uses ~ 75% less tannin for leather manufacture. The excellent leather performance was ascribed to the synergistic effects, where SACC and wattle diffused into collagen fibrils and may bind to collagen via covalent, hydrogen and ionic bonding, locking the hierarchical structure of collagen from microfibrils to fiber bundles. Moreover, we summarized these findings and proposed a diffusion-binding-locking mechanism, providing new insights for current tanning theory. Together with the biodegradable spent tanning liquor, this approach will underpin the development of sustainable leather manufacture. Note de contenu : - EXPERIMENTAL SECTION : Materials - Leather tanning process - Characterization - The environmental impact assessment (EIA) of metal-free tanning process
- RESULTS AND DISCUSSIONS : Optimizations of metal-free combination leather tannage - Molecular mechanisms in the combination tanning system - Morphologies and porous structures of leather - Organoleptic properties and physical performance of the leathers - Environmental assessment and cost analysis of our method
- Table 1 : The physical properties of the leathers. The value on the shoe upper leather suggests the Chinese standard requirements (QB/T 1873-2010)
- Table 2 : The content of extractable metals in the metal-free finished leather
- Table 3 : Environmental assessment index of tanning spent liquor
- Table 4 : The cost of main chemicals used in the SACC-tannin acid and SACC-wattle combination tanningDOI : https://doi.org/10.1186/s42825-022-00108-0 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-022-00108-0.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38537
in COLLAGEN AND LEATHER > Vol. 5 (2023) . - 13 p.[article]Tannin analysis by near infrared spectroscopy in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 79, N° 1 (01-02/1995)
[article]
Titre : Tannin analysis by near infrared spectroscopy Type de document : texte imprimé Année de publication : 1995 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acacia et constituants
Ecorces
Spectroscopie infrarouge proche
Statistique
Tanins -- analyse
Tanins végétauxIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé :
The use of near infrared spectroscopy (NIRS) is demonstrated to be an important alternative to the empirical and laborious traditional methods for tannin analysis of the bark of black wattle (Acacia mearnsii De Wild.), particularly when large numbers of samples have to be processed rapidly.
A set of 98 ground wattle bark samples was used to calibrate the output from a NIRS instrument, taking absorption readings every 2 nm between 1100 nm and 2498 nm. The spectral data from this calibration set was then statistically manipulated using multivariate techniques to generate calibration models. These calibrations were then applied to a separate set of 79 bark samples which, for validation purposes, were also analysed by wet chemistry. The tannin analysis predictions compared favourably with the wet chemistry results on these samples, with standard errors of determination of 1.2%, 0.3% and 1.1% for tans, non-tans and total extractives respectively.Note de contenu : - MATERIALS AND METHODS : Sample preparation - Analysis - Statistical analysis
- RESULTS AND DISCUSSION : Spectral characteristics of bark components
- Table 1 : Characteristics from classical wet chemistry
- Table 2 : Calibration and validation statistics obtained for tans, non-tans and total extractives using partial least squares regression on first derivative transformation of spectral data (PCs = principle components ; SED square error of determination)
- Table 3 : Spectral characteristics of bark componentsEn ligne : https://drive.google.com/file/d/1lj2fjUM8ieQnDb6Bvh-3mCGDFdPG1TZl/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40049
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 79, N° 1 (01-02/1995)[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007002 - Périodique Bibliothèque principale Documentaires Disponible Tanning process study using chestnut and acacia tannin associated with acrylic resin in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 9 (09/2019)
[article]
Titre : Tanning process study using chestnut and acacia tannin associated with acrylic resin Type de document : texte imprimé Année de publication : 2019 Article en page(s) : p. 350-357 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acacia et constituants
Chataigne et constituants
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux -- Propriétés organoleptiques
Cuirs et peaux -- Propriétés physiques
Photostabilité
Polyacryliques
Tannage combinéLe tannage combiné se dit des tannages qui allient deux familles ou genre de tannage pour obtenir un résultat additionnant les qualités complémentaires des tannins mis en œuvre par exemple Chrome-Végétal ou Chrome-Synthétique
Tannage végétal
Température de retraitIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Chromium is the most commonly used tanning agent in the leather industry worldwide due to the good characteristics it adds to the leather. However, it is known that chromium III may oxidize to chromium VI and damage the environment. Based on this context, the industry has vegetable tanning as one of the options that provide leather with different characteristics when compared to the characteristics provided by tanning with salts of chromium. Thus, this study intends to develop a product which is combined with vegetable tanning and brings better characteristics to chrome-free leather. This process raises the quality of the final product, that is, it improves the tanning by combining tannins (acacia and chestnut) with acrylic resin. The methodology consisted of employing six different tanning processes. Firstly, the tanning agents were used alone; secondly, there was the addition of acrylic resin; and, finally, the use of the acrylic resin with tannins. Organoleptic properties, light fastness, shrinkage temperature, and physical-mechanical tests were performed in order to test the quality of the leathers obtained. In the residual baths, chemical oxygen demand (COD), biochemical oxygen demand (BOD), total nitrogen, and total solids were evaluated. Based on the results obtained, it was possible to conclude that the best results were found with the use of chestnut tannin and acrylic resin separately and with the use of acacia mixed with chestnut tannin, which demonstrated that combined vegetable tanning can be an alternative to the production of chrome-free leather with good properties. Note de contenu : - EXPERIMENTAL : Analysis of the tannin mixtures with acrylic resin - Residual bath analysis - Leather analysis
- RESULTS AND DISCUSSION : Analysis of the tannin mixtures with acrylic resin - Residual bath analysis - Leather analysisEn ligne : https://drive.google.com/file/d/1ZR1SfHR6UXftWQ-pNZ8S9MWGessM4QtN/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32903
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIV, N° 9 (09/2019) . - p. 350-357[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21174 - Périodique Bibliothèque principale Documentaires Disponible Upgrading of rural garad-tanned crust leathers / A. E. Musa in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 96, N° 1 (01-02/2012)
[article]
Titre : Upgrading of rural garad-tanned crust leathers Type de document : texte imprimé Auteurs : A. E. Musa, Auteur ; G. A. Gasmelseed, Auteur Année de publication : 2012 Article en page(s) : p. 27-31 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acacia et constituants
Agents de blanchiment
Chaussures
Cuir -- Séchage
Cuirs et peaux
Cuirs et peaux -- Teinture
Produits de nourriture du cuir
Retannage
Sulfate d'aluminium
Tannage végétalIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The present work was caried out to improve Sudanese rural garad tanned crust leathers for production of semi-alum shoe upper leathers. The usual process sequence consists of stripping, bleaching, retannage with aluminium sulphate prepared solution, neutralization, dyeing, fatliquoring, drying and finishing. The physical and chemical characteristics of the leathers produced are compared with control leathers and standard physical properties and showed good agreement. The leathers produced are full, soft, flexible with high tensile strength. The stripped rural garad-tanned leathers were retanned with 2% Al203 ; giving a high shrinkage temperature of 101°C. The leathers produced are full, soft, flexible with high tensile strengh with good organoleptic and strength properties. This confirms that this type of retannage is a promising alternative to traditional chrome tanning. Note de contenu : EXPERIMENTAL - MATERIALS : Preparation of basic aluminum sulphate solution - Upgrading of rural garad-tanned crust leathers - Measurement of hydrothermal stability of leathers - Physical testing and hand evaluation of leathers - Evaluation of chemical constituents in leathers
- RESULTS AND DISCUSSION : Upgrading of rural garad-tanned crust leathers - PERFORMANCE OF LEATHERS : Bulk properties of leathers - hand evaluation of leathers - Strength characteristics of experimental and control crust leathersEn ligne : https://drive.google.com/file/d/1SJG7iaCMxr0eT9vDUfXpWXyRxqpag3w2/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13551
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 96, N° 1 (01-02/2012) . - p. 27-31[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13659 - Périodique Bibliothèque principale Documentaires Disponible