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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Chrome-reduced combination tanning for cleaner dyed sheep fur processing / Wei Ding in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 11 (11/2015)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CX, N° 11 (11/2015) . - p. 363-371 Titre : Chrome-reduced combination tanning for cleaner dyed sheep fur processing Type de document : texte imprimé Auteurs : Wei Ding, Auteur ; Yihan Chen, Auteur ; Ya-Nan Wang, Auteur ; Bi Shi, Auteur Année de publication : 2015 Article en page(s) : p. 363-371 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux de moutons Déchets -- Réduction Eaux usées -- Analyse Fourrures Tannage au chrome Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Chrome tanning is essential for conventional processing of dyed sheep fur as it can provide fur with high hydrothermal stability suitable for dyeing of wool at a temperature around 70°C. However, a long float length and a big offer of chrome tanning agent (16 g/L) are required for the tanning process, which lead to poor uptake of chrome and excessive discharge of chrome in wastewater. In this study, reduction of chrome offer in dyed sheep fur production was investigated to develop a cleaner tanning technology. It was found that the even distribution of chrome and satisfactory dispersion of fur collagen matrix were achieved even though chrome tanning agent offer was reduced to 2 g/L and 4 g/L. But the shrinkage temperature of the furs was only 79°C and 85°C, respectively, which resulted in a sharp area shrink of fur in following high temperature dyeing. In the combination tannage using 10 g/L amphoteric organic tanning agent (TWT) and 2 g/L or 4 g/L chrome tanning agent, the shrinkage temperature of fur was higher than 90°C accompanied by a higher utilization of chrome. These combination tanned furs were capable of enduring dyeing process at 68°C for 8 h, and presented a high uptake of post tanning chemicals because they had an isoelectric point close to that of chrome tanned fur. More importantly, the physical properties of the combination tanned dyed furs were comparable to the dyed fur made by conventional chrome tanning using 16 g/L chrome tanning agent. Note de contenu : - EXPERIMENTAL : Materials - Conventional chrome tanning of sheep fur - Chrome-reduced combination tanning of sheep fur - Post tanning processes of sheep fur - Determination of chrome content in sheep fur and dyeing wastewater - Scanning electron microscope (SEM) analysis of sheep fur - Estimation of area yield of sheep fur - Uptake of fatliquor and dyestuff in post tanning processes - Determination of isoelectric point of sheep fur - Determination of physical properties of fur - RESULTS AND DISCUSSION : Effect of reduction of chrome offer on tanning performance - Effect of reduction of chrome offer on dyeing performance - Chrome-reduced combination tanning using TWT - Dyeing performance of chrome-reduced combination tanned fur En ligne : https://drive.google.com/file/d/19OtOSxVNM2feFFTWNzaprneqTyX2j1al/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24865 [article]

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A cleaner deliming process using sodium gluconate for reduction in nitrogen pollution in leather manufacture / Yunhang Zeng in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 1 (01/2018)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 1 (01/2018) . - p. 19-25 Titre : A cleaner deliming process using sodium gluconate for reduction in nitrogen pollution in leather manufacture Type de document : texte imprimé Auteurs : Yunhang Zeng, Auteur ; Ya-Nan Wang, Auteur ; Ying Song, Auteur ; Jianfei Zhou, Auteur ; Bi Shi, Auteur Année de publication : 2018 Article en page(s) : p. 19-25 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux Cuirs et peaux -- Analyse Décapage Gluconate de sodium Le gluconate de sodium est un composé organique de formule brute Na1C6H11O7. C'est un sel sodique de l'acide gluconique. Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Ammonium salts used in deliming process are the main source of high ammonia nitrogen (NH3-N) concentration in tannery wastewater. To reduce nitrogen pollution in leather manufacture without sacrificing quality of resultant leathers, a cleaner deliming agent prepared by mixing sodium gluconate (60 wt.%), citric acid (15 wt.%) and ammonium sulfate (25 wt.%) together was employed for deliming limed cattle hide pelt. The results indicated that this cleaner deliming agent penetrated the whole pelt very quickly and successfully formed a buffer system of pH 8-9 with the alkali from liming, which prevented acid swelling and damage to the fiber network of pelt. The delimed pelt had a cleaner grain surface with a higher extent of calcium removal than the conventional ammonium delimed pelt. The concentrations of NH3-N and total nitrogen (TN) in the cleaner deliming effluent were dramatically reduced by 86% and 79%, respectively. Moreover, the cleaner deliming scarcely affected subsequent bating process with trypsin. Note de contenu : - EXPERIMENTAL : Materials - Experimental and control deliming and bating processes - Analyses of penetration of deliming agents - Determination of deliming float pH - Determination of concentration of hydroxyproline (Hyp) in deliming effluent - SEM and EDS analyses of delimed pelt - Determination of concentrations of NH3-N, TN, TOC, COD and BOD5 in deliming effluent - Determination of concentrations of protein and Hyp in bating effluent - Observation of mass transfer of trypsin in bated pelt - RESULTS AND DISCUSSION : Penetration and pH buffering capacity of deliming agent - Extent of calcium removal from pelt - Effect of deliming on bating - Environmental benefits En ligne : https://drive.google.com/file/d/15pYiNAZ3f0fxj-aCNZveRUGAmKAQ-gNM/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29748 [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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Determination of free formaldehyde in leather chemicals / Yudan Yi in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 10 (10/2019)  

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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)  

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Effect of cationic monomer structure on the aggregation behavior of amphoteric acrylic polymer around isoelectric point / Qijun Li in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 4 (Année 2022)  

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Effect of co-combustion of tannery sludge and coal on the migration of Cr in the bottom ash / Jianfei Zhou in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 1 (01-02/2014)  

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Effect of sodium chloride on structure of collagen fiber network in pickling and tanning / Li Xinxin in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 6 (06/2016)  

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Effective component in a-amylase preparation for unhairing / Yunhang Zeng in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 3 (03/2013)  

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Essential role of isoelectric point of skin/leather in leather processing / Ya-Nan Wang in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 4 (Année 2022)  

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Experimental and computational fluid dynamics investigation on tanning process in a rotating drum / Yirui Lin in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 11 (11/2023)  

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Fluorescent tracing of dialdehyde sodium alginate tanning agent in leather matrix / Min Zhu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 9 (09/2023)  

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Improvement in leather surface hydrophobicity through low-pressure cold plasma polymerization / Ya-E Feng in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 3 (03/2014)  

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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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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 based on wet white tanned by Al-Zr complex tanning agent / Siwei Cai in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 4 (04/2015)  

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Investigations on the general properties of biomass-based aldehyde tanned sheep fur for its selective post-tanning processing / Wei Ding in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

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Neutral protease assisted low-sulfide hair-save unhairing based on pH-sensitivity of enzyme / Yunhang Zeng in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 9 (09/2016)  

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