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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)
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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 sodiumLe 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 benefitsEn ligne : https://drive.google.com/file/d/15pYiNAZ3f0fxj-aCNZveRUGAmKAQ-gNM/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29748
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 1 (01/2018) . - p. 19-25[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19487 - Périodique Bibliothèque principale Documentaires Disponible Effect of histological feature of leather on acrylic resin retanning / Ying Song in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 3 (05-06/2018)
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Titre : Effect of histological feature of leather on acrylic resin retanning Type de document : texte imprimé Auteurs : Ying Song, Auteur ; Yunhang Zeng, Auteur ; Bi Shi, Auteur Année de publication : 2018 Article en page(s) : p. 149-154 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acide polyacrylique
Cuirs et peaux de bovins
Cuirs et peaux de moutons
Cuirs et peaux de porcs
Peau -- Histologie
RetannageIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The effect of histological features of leather on acrylic resin retanning was investigated by retanning pigskin, cattle hide and sheepskin leathers with fluorescein-labelled poly(acrylic acid) (PAA). A deeper penetration and a higher uptake rate of PAA were observed in the belly area of pigskin leather compared to in its butt area. This led to a greater increase in leather thickness of the belly. As for cattle hide and sheepskin leathers whose structural difference in various parts is not obvious, the differences in penetration and uptake of PAA and increase in leather thickness between their butts and their bellies were relatively slight. These results indicated that acrylic resins penetrate and fill the thinner and looser parts of the leather more easily. This fact gives acrylic resins a good selective filling property and is helpful to level out the structure of leather. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation and analyses of AF-labelled PAA (AF-PAA) - Observation of penetration and distribution of AF-PAA in leather - Determination of uptake rate of PAA in leather - Determination of increase in leather thickness
- RESULTS AND DISCUSSION : Effect of histological features of leather on penetration and distribution of acrylic resin in leather - Effect of histological features on leather on uptake of PAA in leather - Effect of histological features of leather on increase in thickness of leatherEn ligne : https://drive.google.com/file/d/1x84FMU9IsuftPQIMVIWNwd3yh7JcqZCZ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30796
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 102, N° 3 (05-06/2018) . - p. 149-154[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20058 - Périodique Bibliothèque principale Documentaires Disponible Effect of molecular weight of acrylic resin retanning agent on properties of leather / Ying Song in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 4 (04/2017)
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Titre : Effect of molecular weight of acrylic resin retanning agent on properties of leather Type de document : texte imprimé Auteurs : Ying Song, Auteur ; Yunhang Zeng, Auteur ; Kunlu Xiao, Auteur ; Haopeng Wu, Auteur ; Bi Shi, Auteur Année de publication : 2017 Article en page(s) : p. 128-134 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Propriétés mécaniques
Poids moléculaires
Polyacryliques
RetannageIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The effect of molecular weight of acrylic resin retanning agent on its penetration in leather and the properties of the retanned leather were investigated. After retanning chrome tanned leather by four fluorescent acrylic resins with different weight-average molecular weights (Mw) from 5,000 to 200,000, it was observed that the Mw of acrylic resins was not the main factor influencing their penetration in leather. In fact, the dosage of acrylic resin and the charge of leather were more important factors affecting penetration rate. Additionally, an increase in the Mw of acrylic resin led to an increase in the thickness of leather and a decrease in the softness of leather, which is mainly because the acrylic resins with higher Mw can enter larger gaps between collagen fibers and exhibit a better filling effect. Moreover, when acrylic resins were used together with other anionic retanning agents in retanning process, the penetration and distribution evenness of acrylic resins were remarkably improved, and meanwhile the acrylic resins with different molecular weights presented nearly the same effect on properties of resultant leathers. Note de contenu : - EXPERIMENTAL : Materials - Preparation and analyses of AF-PAAs with different molecular weights - Effect of molecular weight of acrylic resin on its penetration in leather - Effect of molecular weight of acrylic resin on properties of leather
- RESULTS AND DISCUSSION : Effect of molecular weight of acrylic resin on its penetration in leather - Effect of molecular weight of acrylic resin on properties of leatherEn ligne : https://drive.google.com/file/d/1g5WGNa9lR2nJVjlYcEiHMtSQelEihC7J/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28362
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Code-barres Cote Support Localisation Section Disponibilité 18835 - Périodique Bibliothèque principale Documentaires Disponible Factors affecting mass transfer of protease in pelt during enzymatic bating process / Ying Song in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 1 (Année 2019)
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Titre : Factors affecting mass transfer of protease in pelt during enzymatic bating process Type de document : texte imprimé Auteurs : Ying Song, Auteur ; Siqi Wu, Auteur ; Qian Yang, Auteur ; Hao Liu, Auteur ; Yunhang Zeng, Auteur ; Bi Shi, Auteur Année de publication : 2019 Article en page(s) : 10 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Confitage Le confitage est une action biochimique effectuée au moyen de produits enzymatiques, qui a pour but de dégrader les fibres élastiques, contribuant ainsi à augmenter la souplesse du cuir. En outre, les enzymes complètent la dégradation des résidus épidermiques, donnant ainsi une fleur plus propre et plus lisse.
Cuirs et peaux
Electrostatique
Peptidases
Poids moléculaires
Tension superficielle
Transfert de masseIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Bating pelt with protease is an important process, which removes unwanted non-collagenous proteins from the pelt and moderately disperse hide collagen network. However, the grain surface, may be excessively hydrolyzed during bating due to the longer retention time of protease in the grain than in the middle layer caused by the low mass transfer rate of protease in pelt. Here, the effects of protease dosage, common auxiliaries and molecular weight of protease on protease transfer during bating were investigated so that we can find the key points to avoid excessive collagen damage, particularly in the grain. Observably, increasing protease dosage led to faster protease transfer and softer leather, but along with more considerable grain damage. Using penetrating agent JFC (fatty alcohol-polyoxyethylene ether) and ammonium sulfate enhanced protease transfer and simultaneously alleviated collagen damage due to the decrease in interfacial tension and electrostatic attraction between protease and pelt, respectively. Additionally, proteases with lower molecular weight transferred faster in pelt, which suggests that a potential strategy to solve the conflict between the mass transfer and the reaction of protease in pelt might be to produce/employ smaller bating proteases. Note de contenu : - MATERIALS AND METHODS : Materials - Effect of protease dosage on bating performance - Effect of auxiliaries on bating performance of protease - Effect of molecular weight of protease on its transfer rate during bating
- RESULTS AND DISCUSSION : The effect of protease dosage on bating performance - The effect of auxiliaries on bating performance - The effect of molecular weight of protease on its mass transfer rate during batingDOI : https://doi.org/10.1186/s42825-019-0007-7 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-019-0007-7.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36949
in JOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 1 (Année 2019) . - 10 p.[article]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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Titre : Interaction between retanning agents and wet white tanned by a novel bimetal complex tanning agent Type de document : texte imprimé Auteurs : Wanli Huang, Auteur ; Ying Song, Auteur ; Yue Yu, Auteur ; Ya-Nan Wang, Auteur ; Bi Shi, Auteur Année de publication : 2020 Article en page(s) : 9 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Complexes métalliques
Cuirs et peaux -- Analyse
Point isoélectriqueEn biochimie, le point isoélectrique (pI) ou potentiel hydrogène isoélectrique (pHI) est le pH auquel une molécule est sous forme d'ion mixte ou, en physico-chimie, le pH d'une solution aqueuse dans laquelle un solide existe sous un potentiel électrique neutre.
En physico-chimie : Selon Bolger, le caractère acide ou basique d'une surface s'exprime par son point isoélectrique " Is ou IEPS (Iso Electric point for the surface) " ou point de charge nulle " PCN ou PZC (Point of Zero Charge) ", défini comme étant le pH de la solution aqueuse dans laquelle le solide existe sous un potentiel électrique neutre. Si le pH de la solution est basique, la surface est acide, et inversement. La différence entre le PZC et l'IEPS est basée sur le phénomène d'adsorption spécifique. On peut considérer que si la grandeur mesurée ne dépend pas de la solution utilisée pour la mesurer (pH, concentration, nature des ions), alors on a affaire à un PZC. Dans le cas contraire, c'est un IEPS que l'on mesure. Par exemple, quand la mesure de goutte sessile à deux liquides est utilisée, on considère en général qu'il n'y a pas adsorption des ions de cette goutte et que la goutte déplace complètement l'alcane qui sert de deuxième liquide: on est alors en présence d’un PZC. Au contraire, dans les mesures de potentiel d'écoulement (streaming potential), la solution joue un rôle important et c'est un IEPS que l'on mesure. Enfin, la charge nette se définit grâce au pH de la solution aqueuse dans laquelle la surface métallique existe, dans un état électriquement neutre (c’est-à -dire [M-OH2+ surf]=[M-O- surf]) et au PZC.
- Si pH < PZC alors la charge nette est positive
- Si pH > PZC alors la charge nette est négative.
Il existe plusieurs méthodes expérimentales permettant de décrire l’état acido-basique de la surface : la mesure du potentiel d’écoulement, la photoélectrochimie, la mesure de l’angle de contact, et la spectroscopie XPS.
Retannage
Tannage chrome free
Traçage fluorescent
Wet-white (tannage)Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A promising and practical chrome-free tanning system has been developed based on a novel Al–Zr bimetal complex tanning agent. However, to achieve satisfactory resultant leather, the retanning process that is compatible with this emerging tannage needs to be investigated systematically. This paper aims to explore the interaction between the bimetal complex tanned wet white and retanning agents. The isoelectric point (pI) of wet white was 7.2, which was nearly the same as wet blue. The electropositivity of wet white was even higher than that of wet blue during post-tanning processes, resulting in higher uptake rate of retanning agents. The distribution of various retanning agents in wet white was analyzed by pI measurement of layered leather and fluorescent tracing technique. The retanning agents were unevenly distributed throughout the cross-section, which might be an important restriction factor in obtaining satisfactory organoleptic properties of the crust leather. This fact is mainly due to the strong electrostatic interaction between anionic retanning agents and wet white. Applying a high dosage of multiple retanning agents in a proper sequence of addition benefited the full penetration of retanning agents in leather matrix and thus improved the organoleptic properties of crust leather. This work provides guidance for optimizing retanning process of the wet white leather. Note de contenu : - EXPERIMENTAL : Materials - Post-tanning processes of wet white and wet blue - Retanning trials of wet white - Observation of retanning agents distribution in leather - Analytical methods
- RESULTS AND DISCUSSION : Charge properties of leather during post-tanning - Interaction between wet white and single retanning agent - Interaction between wet white and multiple retanning agents
- Table 1 : Retanning trialsDOI : https://doi.org/10.1186/s42825-020-00023-2 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-020-00023-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37332
in JOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 2 (Année 2020) . - 9 p.[article]Quantitative determinations of isoelectric point of retanned leather and distribution of retanning agent / Ying Song in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 7 (07/2018)
PermalinkVisualization and quantification of penetration/mass transfer of acrylic resin retanning agent in leather using fluorescent tracing technique / Yunhang Zeng in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 11 (11/2016)
PermalinkVisualization of penetration and reaction of aldehyde tanning agent in leather using fluorescence technique / Ying Song in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 7 (07/2020)
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