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Biomass-based tanning agent for sustainable leather manufacture via cyanuric chloride modified chitooligosaccharide / Min Jiang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 10 (10/2023)
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inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVIII, N° 10 (10/2023) . - p. 417-427
Titre : Biomass-based tanning agent for sustainable leather manufacture via cyanuric chloride modified chitooligosaccharide Type de document : texte imprimé Auteurs : Min Jiang, Auteur ; Yuanhang Xiao, Auteur ; Jun Sang, Auteur ; Chunhua Wang, Auteur ; Jiajing Zhou, Auteur ; Wei Lin, Auteur Année de publication : 2023 Article en page(s) : p. 417-427 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agents de tannage
Analyse morphologique
Biomasse
Caractérisation
Chitooligosaccharide
Composés organiques -- Synthèse
Cuirs et peaux -- Propriétés organoleptiques
Cuirs et peaux -- Propriétés physiques
PoidsIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Developing alternative tanning agents to avoid the potential environmental and human health risks from the conventional chrome tanning is essential for the leather industry. In this work, we prepared an eco-friendly biomass-based tanning agent dichlorotriazinyl chitooligosaccharide (DTCS) by modifying chitooligosaccharide (COS) with cyanuric chloride (CC) for chrome-free leather manufacture. The synthesis of such biomass-based tanning agent was systematically optimized to obtain the target product with high grafting degree of 67% and weight-average molecular weight (Mw) of 1465 g/mol. The non-pickling tanning procedure using DTCS was investigated, and the interactions between DTCS and collagen fibers were studied. Our results showed that the hydrothermal stability of the tanned leather was significantly increased, i.e., the shrinkage temperature (Ts) exceeding 82.0°C, and the mechanical properties were improved. Moreover, the organoleptic properties of leather (e.g., fullness, softness and grain tightness) exhibited obvious improvement. This research not only offers a reliable approach for cleaner leather manufacturing while addressing the underlying ecological pressure, but also highlights the emerging use of biomass materials in the leather industry. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis of DTCS - Determination of grafting degree (GD) of DTCS - Characterization of DTCS - DTCS tanning trials - Leather properties analysis
- RESULTS AND DISCUSSION : Optimization of DTCS synthesis condition - Characterization of DTCS - Optimizatin of DTCS tanning process - Leather morphology anlaysis - Thickening rate analysis - Physical and organoleptic properties analysis
- Table 1 : Tanning process for DTCS
- Table 2 : Tanning process for F-90
- Table 3 : The average molecular weight and molecular-weight distribution of COS and DTCS - Table IV : The optimum tanning process of DTCSDOI : https://doi.org/10.34314/jalca.v118i10.8230 En ligne : https://drive.google.com/file/d/1csGAWb8R-ZPLSmdInoTLfYTzOcUHK0KN/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39940 [article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24241 - Périodique Bibliothèque principale Documentaires Disponible Pickering aqueous foam templating : a promising strategy to fabricate porous waterborne polyurethane coatings / Jianhui Wu in COLLAGEN AND LEATHER, Vol. 5 (2023)
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inCOLLAGEN AND LEATHER > Vol. 5 (2023) . - 4 p.
Titre : Pickering aqueous foam templating : a promising strategy to fabricate porous waterborne polyurethane coatings Type de document : texte imprimé Auteurs : Jianhui Wu, Auteur ; Jiajing Zhou, Auteur ; Zhenghao Shi, Auteur ; Chunhua Wang, Auteur ; To Ngai, Auteur ; Wei Lin, Auteur Année de publication : 2023 Article en page(s) : 4 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Emulsions pickering
Matériaux poreux
Mousses plastiques
Polymères en émulsion
Polyuréthanes
Revêtements en phase aqueuseIndex. décimale : 667.9 Revêtements et enduits Résumé : Waterborne polyurethane (WPU) has been widely used as coatings in industrial fields ranging from wood, real/synthetic leather, and textiles, because it exhibits versatile performance, excellent eco-friendliness, and superior film-forming property. In terms of wearable products, compact WPU coatings often cause discomfort due to the intrinsic poor vapor transmission. Moreover, the resultant relatively high humidity promotes the growth of skin flora, resulting in unpleasant odors, and even skin infectious diseases. To this end, breathable porous WPU coatings with tunable pore size has emerged as a favorable alternative to modulate the “climate” of microenvironment at the interface between skins and wearable products. Several strategies have been now developed to engineer porous WPU coatings. In this perspective, we describe various strategies that have been developed to manufacture porous WPU coatings. According to whether the template is used and the category of templates used, we categorize these strategies into three different types, including hard templating, soft templating, and template-free methods. We discuss the advantages and disadvantages of each strategy and highlight the importance in developing new strategies of making highly breathable WPU to help the sustainable growth of the leather industry. Note de contenu : - Hard templating
- Soft templating
- Template-free method
- Pickering aqueous foam templatingDOI : https://doi.org/10.1186/s42825-023-00115-9 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-023-00115-9.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40064 [article]Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Sustainable metal-free leather manufacture via synergistic effects of triazine derivative and vegetable tannins / Yuanhang Xiao in COLLAGEN AND LEATHER, Vol. 5 (2023)
[article]
inCOLLAGEN AND LEATHER > Vol. 5 (2023) . - 13 p.
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 [article]Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire