An exploration of enhancing thermal stability of leather by hydrophilicity regulation : effect of hydrophilicity of phenolic syntan / Sun Qingyong in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 4 (Année 2022)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 4 (Année 2022) . - 10 p. Titre : An exploration of enhancing thermal stability of leather by hydrophilicity regulation : effect of hydrophilicity of phenolic syntan Type de document : texte imprimé Auteurs : Sun Qingyong, Auteur ; Zeng Yunhang, Auteur ; Yue Yu, Auteur ; Ya-Nan Wang, Auteur ; Bi Shi, Auteur Année de publication : 2022 Article en page(s) : 10 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Analyse Cuirs et peaux -- Teneur en eau Dynamique moléculaire Hydrophobie Phénoplastes Retannage Simulation, Méthode de Stabilité thermique Syntans Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Effect of retanning on the thermal stability of leather is eliciting increasing attention. However, the relationship between the hydrophilicity of retanning agents and the heat resistance of leather and the corresponding mechanism remain unclear. Herein, phenolic formaldehyde syntans (PFSs) were selected as models to explore the effect of the hydrophilicity of retanning agents on the thermal stability of retanned leather. The thermal stability of leather was closely correlated to the hydrophilic group content (sulfonation degree) of PFSs. As the sulfonation degree increased, the water absorption rate of PFSs and their retanned leathers decreased, whereas the thermal stability of leather increased. Molecular dynamics simulation results proved that the introduction of PFSs could reduce the binding ability of collagen molecules with water and thus decreased the water molecules around the PFS-treated collagen. These results may provide guidance for the tanners to select retanning agents reasonably to improve the thermal stability of leather. Note de contenu : - EXPERIMENTAL : Materials - Water adsorption behavior of PFSs - Retanning experiments - Analysis of leather - MD simulation - RESULTS AND DISCUSSION : Effect of DS on the water adsorption behavior of PFSs - Effect of DS on the water adsorption of PFSs retanned leather - Effect of DS on the thermal stability of PFSs retanned leathers - Table 1 : Retanning and fatliquoring processes - Table 2 : Sequence of the collagen peptide used for constructing collagen model - Table 3 : Simulation details - Table 4 : Adsorption kinetics parameters fitted by the pseudo-second-order rate model - Table 5 : Weight loss of PFSs retanned leathers and control leather at different stages and residual weight DOI : https://doi.org/10.1186/s42825-022-00096-1 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-022-00096-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38217 [article]

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Construction of a chrome-free tanning system based on highly-oxidized starch–zirconium complexes / Yue Yu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 3 (03/2022)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 3 (03/2022) . - p. 87-95 Titre : Construction of a chrome-free tanning system based on highly-oxidized starch–zirconium complexes Type de document : texte imprimé Auteurs : Yue Yu, Auteur ; Hui Wang, Auteur ; Ya-Nan Wang, Auteur ; Jianfei Zhou, Auteur ; Bi Shi, Auteur Année de publication : 2022 Article en page(s) : p. 87-95 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Amidons Biodégradation 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 Eaux usées -- Analyse Granulométrie Post-tannage Taille des particules Tannage chrome free Tannage combiné Le 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 Å“uvre par exemple Chrome-Végétal ou Chrome-Synthétique Zirconium Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Chrome-free leather manufacture is one of the major focuses of leather industry. In this work, a chrome-free tanning system based on highly-oxidized starch–zirconium complexes (HOS–Zr) was constructed. Particle size and charge properties analyses revealed that the small size (2.5 nm) and the low cationic species content (45.1%) of HOS–Zr at low pH facilitated its uniform penetration in leather at the initial stage of tanning, and the large size (89–169 nm) and the high cationic species content (77.5%) of HOS–Zr after basification contributed to its stable crosslinking between collagen fibers. A 3% HOS–Zr offer (based on the weight of ZrO2) imparted wet white with sufficient tanning effect. The physical properties of HOS–Zr crust leather were remarkably better than those of lactic acid–zirconium crust leather and were comparable to those of chrome crust leather. Wastewater in HOS–Zr tanning system showed a reduction in TOC load by 40.0% and higher biodegradability compared with chrome tanning system. As a result, this work provided a practical and sustainable approach to eliminate chrome in leather manufacture. Note de contenu : - EXPERIMENTAL : Materials - Optimization of HOS-Zr tanning system - Particle size analysis - Charge properties analysis - Tanning trials - RESULTS AND DISCUSSION : Optimization of HOS-Zr-tanning system - Particle soze of HOS-Zr - Charge properties of Zr complexes - Comprehensive evaluation of the tanning performance of HOS-Zr - Table 1 : La-Zr and HOS-Zr tanning process - Table 2 : conventional chrome tanning process - Table 3 : Post-tanning process - Table 4 : Properties of tanned leathers - Table 5 : Physical properties o fcrust leathers - Table 6 : Pollution loads in tanning and post-tanning wastewaters (unit: kg/ton of pickled hide) - Table 7 : Biodegradability of tanning and post-tanning wastewaters En ligne : https://drive.google.com/file/d/1VmQIPtNQ6vZECS63DGWb4kMJcZEwDYNN/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37599 [article]

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A deeper exploration of the relation between sulfonation degree and retanning performance of aromatic syntans / Qingyong Sun in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 10 p. Titre : A deeper exploration of the relation between sulfonation degree and retanning performance of aromatic syntans Type de document : texte imprimé Auteurs : Qingyong Sun, Auteur ; Yunhang Zeng, Auteur ; Ya-Nan Wang, Auteur ; Yue Yu, Auteur ; Bi Shi, Auteur Année de publication : 2021 Article en page(s) : 10 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composés aromatiques Dynamique moléculaire Pénétration (physique) Précipitation (chimie) Retannage Simulation, Méthode de Sulfonation Syntans Tannage synthétique Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : It is well-known that the sulfonation degree (DS) of aromatic syntan is an important factor affecting its retanning performances. But the quantitative relation between DS and syntan property and the influencing mechanism of DS on syntan property are not clarified. In this work, five phenolic formaldehyde syntans (PFSs) with the same polymerization degree but varying DS were prepared to investigate the effect of DS on the properties of syntan and crust leather. It was found that the absolute value of zeta potential and the particle size of PFS decreased with increasing DS in aqueous solution. Molecular dynamic simulation results proved that the DS of PFS was a major contributor to electrostatic interaction and hydrogen bonding in the PFS–water system and greatly affected the aggregation and dispersion of PFS in aqueous solution. The PFS with a low DS was prone to aggregate to large particles in aqueous solution because of low intermolecular electrostatic repulsion and less hydrogen bonds and therefore can be used to increase the thickness and tightness of leather. The PFS with a high DS presented a small particle size with more anionic groups in aqueous solution, thereby sharply decreasing the positive charge of leather surface and facilitating the penetration of the post-tanning agents into the leather. These results might be scientifically valid for rational molecular design of syntans and more productive use of syntans in leather making. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of PFSs with different DSs - Determination of DS of PFS - Determination of zeta potential and particle size of PFS - MD simulation - Retanning and fatliquoring - Determination of zeta potential and pIs of retanned leather - Analysis of PFS penetration in leather - Determination of uptake rate of PFS by leather - Determination of thickness increase rate of leather - Determination of leather softness - RESULTS AND DISCUSSION : Effect of DS on zeta potential and particle size of PFS - Effect of DS of PFS on pI of retanned leather - Effect of DS on penetration of PFS in retanned leather - Effect of DS on uptake of PFS by leather - Effect of DS of PFS on thickness and softness of crust leather - Table 1 : Simulation details - Table 2 : Retanning process - Table 3 : Retanning and fatliqouring processes DOI : https://doi.org/10.1186/s42825-021-00073-0 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00073-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37556 [article]

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Diagnosing the environmental impacts of typical fatliquors in leather manufacture from life cycle assessment perspective / Yue Yu in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 4 (Année 2022)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 4 (Année 2022) . - 14 p. Titre : Diagnosing the environmental impacts of typical fatliquors in leather manufacture from life cycle assessment perspective Type de document : texte imprimé Auteurs : Yue Yu, Auteur ; Qingyong Sun, Auteur ; Yunhang Zeng, Auteur ; Yirui Lin, Auteur ; Ya-Nan Wang, Auteur ; Bi Shi, Auteur Année de publication : 2022 Article en page(s) : 14 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Industrie -- Aspect de l'environnement Durée de vie (Ingénierie) Environnement -- Etudes d'impact Produits de nourriture du cuir Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The environmental impacts of typical fatliquors were diagnosed by the life cycle assessment of industrial production and use (post-tanning) processes. Life cycle impact assessment and sensitivity analysis showed that fatliquor and fatliquoring operation were the major contributors to the environmental impacts of post-tanning because a large amount of fatliquors was consumed during fatliquoring operation. The environmental impacts of fatliquors decreased in the following order: chlorinated paraffin (CP) > sulfonated rape oil (SNR) > sulfated rape oil (SR) > phosphated rape oil (PR) > oxidized–sulfited rape oil (OSR). Sulfuric acid, fuming sulfuric acid, and chlorine used for fatliquor modification gave the main contribution to most impact categories for SR, SNR, and CP production, whereas rape oil contributed the most for PR and OSR production. OSR use process reduced the primary energy demand, abiotic depletion potential, and global warming potential by 38.5%, 56.0%, and 48.5%, respectively, compared with CP use process. These results suggested that biomass-derived fatliquors, especially oxidized–sulfited and phosphate modified fatiliquors, helped reduce the environmental burdens in leather manufacturing. Note de contenu : - MATERIALS AND METHODS : Materials - Goal and scope definition - Functional unit and system boundary - Life cycle inventory analysis - LCIA - Sensitivity and uncertainty analyses - RESULTS AND DISCUSSION : Environmental impacts of fatliquor production process - Environmental impacts of fatliquor use process - Sensitivity and uncertainty analyses - Table 1 Description of impact categories - Table 2 Sensitivities of chemicals, energy, and effluents to impact categories for various fatliquor use processes DOI : https://doi.org/10.1186/s42825-022-00084-5 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-022-00084-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37574 [article]

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Evaluation and improvement of the oxidative stability of leather fatliquors / Yue Yu in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 10 p. Titre : Evaluation and improvement of the oxidative stability of leather fatliquors Type de document : texte imprimé Auteurs : Yue Yu, Auteur ; Min Huang, Auteur ; Jiaqi Lv, Auteur ; Zeng Yunhang, Auteur Année de publication : 2021 Article en page(s) : 10 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antioxydants Essais accélérés (technologie) Huiles et graisses Produits de nourriture du cuir Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Fatliquor oxidation may give leather unpleasant odor, and excessive amounts of Cr(VI) and volatile organic compounds. The accurate evaluation and improvement of the oxidative stability of fatliquors are of great significance to high-quality leather manufacturing. We proposed a set of practical methods for evaluating the oxidative stability of fatliquors on the basis of oxidation induction time, change in iodine value (∆ IV), and change in acid value (∆ AV) under accelerated oxidation conditions (at 100 °C with 10 L/h of air). Oxidation induction time is a highly sensitive marker for quantifying the oxidative stability of fatliquors, and ∆ IV and ∆ AV that are low cost and easy to operate are useful in evaluating the oxidative stability of fatliquors when the oxidation induction time is less than 22 h. The number of double bonds in fatliquors is an important factor affecting oxidative stability. The sulfation modification of fatliquors that greatly reduces double bonds and the addition of antioxidants, especially butylated hydroxyanisole and butylated hydroxytoluene, markedly improve oxidative stability of fatliquors. Note de contenu : - MATERIALS AND METHODS : Materials - Accelerated oxidation tests for fatliquors - Attenuated total reflection Fourier transform infrared spectrum of modified rape oils - Accelerated oxidation tests for modified rape oils - Accelerated oxidation tests for sulfated rape oil with antioxidants - RESULTS AND DISCUSSION : Establishment of methods for evaluating the oxidative stability of fatliquors - Effect of modification method on the oxidative stability of fatliquors - Effect of antioxidant on the oxidative stability of fatliquors DOI : https://doi.org/10.1186/s42825-021-00070-3 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00070-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37554 [article]

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Inhibitory effect of protein filling agent from bovine hair on the oxidation of Cr(III) / Yue Yu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 12 (12/2015)  

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Insight into the correlations between fiber dispersion and physical properties of chrome tanned leather / Xiu He in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 1 (01/2020)  

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Interaction between retanning agents and wet white tanned by a novel bimetal complex tanning agent / Wanli Huang in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 2 (Année 2020)  

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Inverse chrome tanning technology : A practical approach to minimizing Cr(III) discharge / Yue Yu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 5 (05/2020)  

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Oxidized maltodextrin : A novel ligand for aluminum-zirconium complex tanning / Xueru Guo in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 5 (05/2021)  

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Tanning performance of a novel chrome-free complex tanning agent : penetration and distribution / Zhen Wang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 8 (08/2021)  

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Thermodynamic investigations on chrome and aluminum tanning / Li Wang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 11 (11/2017)  

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