Effect of chrome content in the chrome tanning liquid of the leather tanning machine on the properties of leather / Wang Xue-Chuan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 1 (01-02/2015)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 1 (01-02/2015) . - p. 33-38 Titre : Effect of chrome content in the chrome tanning liquid of the leather tanning machine on the properties of leather Type de document : texte imprimé Auteurs : Wang Xue-Chuan, Auteur ; Zhang Feifei, Auteur ; Qiang Tao-Tao, Auteur ; Xi Ying, Auteur Année de publication : 2015 Article en page(s) : p. 33-38 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bains de tannage -- Teneur en chrome Caractérisation Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés physiques Mesure Tannage -- Appareils et matériels Tannage au chrome Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The effect of chrome content in chrome tanning liquid on the physical and mechanical properties of leather when using the specially designed leather tanning machine were studied and the leather was characterized by EDS and SEM. The results showed that, considering the chrome content in leather and the physical and mechanical properties of leather, the best chrome content in the chrome tanning liquid was 16g/L. The EDS results showed that the distribution of chrome in leather was relatively uniform. The SEM results showed that the collagen fibre dispersion of leather tanned with the leather tanning machine was better than the leather tanned by drum. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Equipment - Experiment operation - Testing characterization - RESULTS AND DISCUSSION : The effect of chrome content in chrome tanning liquid on the shrinkage temperature of leather - The effect of chrome content in chrome tanning liquid on physical and mechanical properties of leather - EDS analysis - SEM analysis En ligne : https://drive.google.com/file/d/1UTIWJ4VvzIQFcgthQU-xPoAjPPglqI3m/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23232 [article]

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Fluorescence labelling of amphoteric acrylic retanning agent / Jin Liqiang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 108, N° 4 (07-08/2024)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 108, N° 4 (07-08/2024) . - p. 185-190 Titre : Fluorescence labelling of amphoteric acrylic retanning agent Type de document : texte imprimé Auteurs : Jin Liqiang, Auteur ; Gaosheng Zou, Auteur ; Wenbin Xun, Auteur ; Yulu Wang, Auteur ; Zhang Feifei, Auteur ; Hongxia Zhu, Auteur Année de publication : 2024 Article en page(s) : p. 185-190 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de tannage Caractérisation Composés amphotériques Cuirs et peaux Fluorescence Marquage (technologie) Polyvinylamine Retannage Transfert de masse Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In recent years, there has been a growing focus on amphoteric retanning materials due to their crucial role in enhancing the electropositivity of retanned leather and improving the absorption of anionic dyes and fatliquors. This paper introduces a novel design and successful preparation of amphoteric retanning agents. Initially, a series of poly(N-vinylformamide-co-acrylic acid) copolymers were synthesized through a free radical copolymerization reaction initiated by azodiisobutyamidine hydrochloride. Subsequently, these polymers were hydrolyzed to produce an amphoteric retanning agent (A-PVAm) with a solid content of 15 %(Wt). Their structures were characterized using FT-IR, and their isoelectric points were determined through a zeta potential analyzer. Following this, a fluorescent tracer (FA-PVAm) was synthesized by reacting fluorescein 5-isothiocyanate with A-PVAm. This tracer was utilized to monitor the real-time penetration and mass transfer of A-PVAm during the retanning process as a signaling agent. The mass transfer of A-PVAm was observed concerning dosage and running time. It was observed that within 60 minutes, A-PVAm could evenly distribute throughout the leather. In instances where the retanning agent dosage was inadequate, the inner part of the crust showed minimal presence of the retanning agent. However, at dosages exceeding 20 %, the retanning agent exhibited uniform distribution within the leather. The utilization of the fluorescent tracing technique proved effective in creating a tracer to monitor the penetration of the amphoteric acrylic resin retanning agent in leather. This approach can assist in optimizing the molecule structure of the polyacrylate retanning agent and analyzing its mechanism of action. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Preparation of poly (N-vinylformamide-co-acrylic acid) copolymer (PNVF) - Preparation of amphoteric polyvinylamine retanning agent (A-PVAm) - The mass transfer and distribution of A-PVAm in crust - RESULTS AND DISCUSSION : Characterization of (PNVF) - Characterization of A-PVAm - Characterization of FA-PVAm - The mass transfer and distribution of A-PVAm in crust - Table 1 : Recipe of the preparation of PNVF - Table 2 : The application formulation of A-PVAm En ligne : https://drive.google.com/file/d/1l6KtiiRU5KjinwvROAzHg82Dvg4fcu9O/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41405 [article]

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Preparation and application of a high exhaustion chrome tanning auxiliary from limed fleshings / Hongjiao Liang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 107, N° 3 (05-06/2023)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 107, N° 3 (05-06/2023) . - p. 98-105 Titre : Preparation and application of a high exhaustion chrome tanning auxiliary from limed fleshings Type de document : texte imprimé Auteurs : Hongjiao Liang, Auteur ; Jun Zhao, Auteur ; Yulu Wang, Auteur ; Jin Liqiang, Auteur ; Zhang Feifei, Auteur Année de publication : 2023 Article en page(s) : p. 98-105 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Chaulage Collagène Cuirs et peaux -- Déchets -- Recyclage Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés thermiques Cuirs et peaux de chèvres Echarnage Epuisement des tanins Hydrolysats de protéines Morphologie (matériaux) Tannage au chrome Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The recycling of leather solid waste has become a key issue aimed at realising the sustainable development of the leather industry. Recently, more and more attention has been paid on the recycling of limed fleshings. In this paper, a new recycling method for limed fleshings is reported. First, collagen protein hydrolysate (CH) was obtained by hydrolysing limed fleshings under alkaline conditions, and then the CHwas modified with cyanuric chloride (TCT) to obtain a high exhaustion chrome auxiliary (HECA). The coordination of HECA with chromium salts was investigated by ultraviolet-visible (UV-Vis) spectrum. HECA was applied in the chrome tanning process as an additive. The chrome concentration in effluent, the shrinkage temperature and mechanical properties of the resultant wet-blue were determined. Thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to analyse the properties of the obtained leather. The results show that HECA could coordinate with chromium salts and significantly improved the absorption and fixation of chrome salt into leather. When the amount of chrome tanning agent was 5% and the amount of HECA was 3%, the uptake of chrome tanning agent could be increased to 92.42%, the shrinkage temperature (Ts) of wet-blue leather could reach 102.8°C, the relative increases being 27.26% and 7.3°C, respectively, compared with the conventional tanning process. The obtained wet-blue leather demonstrated uniform grain, good fullness and improved mechanical properties. This recycling method provides a valuable insight of developing high exhaustion chrome tanning aid from limed fleshings, and consequently increases the economic and environmental benefits in leather production. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Preparation of collagen protein hydrolysate (CH) - Preparation of high exhaustion chrome auxiliary (HECA) - Coordination of HECA with chromium salt - Application of HECA in tanning process - Characterisation - RESULTS AND DISCUSSIONS : Physicochemical index of CH - Characterisation of HECA - Coordination of HECA with chromium salt - Ts and chrome uptake rate - Thermal properties and morphology of the leather - XRD analysis of wet-blue leather - Mechanical properties of leather samples - Table 1 : Tanning process of pickled goat pelts - Table 2 : Basic characteristics of CH - Table 3 : Mechanical properties of leather samples En ligne : https://drive.google.com/file/d/1DMihbpPPdVi8PEOBB1qi5aQ0eQbtKieW/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39580 [article]

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Preparation of amino-terminated hyperbranched buffing dust and its adsorption property towards acid fuchsin : Use of an industry by-product to adsorb dyestuffs / Jie Liu in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 105, N° 1 (01-02/2021)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 105, N° 1 (01-02/2021) . - p. 31-40 Titre : Preparation of amino-terminated hyperbranched buffing dust and its adsorption property towards acid fuchsin : Use of an industry by-product to adsorb dyestuffs Type de document : texte imprimé Auteurs : Jie Liu, Auteur ; Zhang Feifei, Auteur ; Yinghu Song, Auteur ; Zhendi An, Auteur ; Yanchun Li, Auteur Année de publication : 2021 Article en page(s) : p. 31-40 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse quantitative (chimie) Caractérisation Colorants -- Adsorption Cuirs et peaux -- Déchets -- Recyclage Eaux usées -- Epuration Electrostatique Fuchsine, Acide Isotherme d'adsorption Poids moléculaires Polymères ramifiés Poussière de cuir Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Buffing dust (BD) is generated in the buffing process of leather making. Amino-terminated hyperbranched polymer (HBPN) was used to modify the BD to prepare hyperbranched polymer modified BD (HBPN-B). The molecular weight of HBPN was analysed by GPC and FTIR, SEM-EDS and BET analysis were employed to characterise the structure of the HBPN-B. The BET specific surface area of HBPN-B was 7.128m2.g-1. The EDS analysis results show that after modification, the N content of BD increased from 21.23% to 24.47%. HBPN-B was then used in the adsorption of dye from wastewater. The influences of reaction conditions on the adsorption properties of HBPN-B towards acid fuchsin were studied and the adsorption kinetic and isotherm were researched. The removal rate of acid fuchsin by HBPN-B increased with the increase of pH, the removal rate reached the maximum at pH2.5. Electrostatic attraction was the chief adsorption mechanism. The removal rate increased with the increase of HBPN-B dosage and temperature. The adsorption process was in conformity with pseudo-second order kinetic and Langmuir adsorption isotherm model adsorption. Note de contenu : - MATERIALS AND METHODS : Chemicals - Preparation of HBPN-B - The characterisation of HBPN-B - Quantification of acid fuchsin - Batch adsorption experiments - Adsorption kinetic - Adsorption isotherm - RESULTS AND DISCUSSION : Characterisation of the HBPN-B - Effect of conditions of solution to the adsorption property of HBPN-B - Kinetics adsorption studies - Adsorption isotherm - Table 1 : GPC analysis result of HBPN - Table 2 : BET characterisation of biosorbent - Table 3 : Constants for the kinetic models of acid fuchsin on the HBPN-B - Table 4 : Isotherm parameters obtained from the fitting to experimental results on the adsorption of acid fuchsin onto the HBPN-B En ligne : https://drive.google.com/file/d/1HBFOgdQ3CcXaP5KEwrSo-QjLF-JlWCTB/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35315 [article]

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Progress of application and chemical modification of biomass collagen : a review / Wang Xuechuan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 5 (09-10/2015)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 5 (09-10/2015) . - p. 216-222 Titre : Progress of application and chemical modification of biomass collagen : a review Type de document : texte imprimé Auteurs : Wang Xuechuan, Auteur ; Xiaoqin Wang, Auteur ; Ren Longfang, Auteur ; Qiang Taotao, Auteur ; Guo Peiying, Auteur ; Zhang Feifei, Auteur Année de publication : 2015 Article en page(s) : p. 216-222 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chimie industrielle Collagène Copolymères greffés Copolymérisation Greffage (chimie) Matériaux -- Applications industrielles Réticulation (polymérisation) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : As an animal biomass resource, collagen not only has rich sources, but is also an important component of animal skins. In this study, structure and functional characteristics of collagen are summarized. The lastest achievements on molecular assembly modifying methods for collagen cross-linking, groups, and graft copolymerization modifications are reviewed. The applications of modified collagen in the fields of leathers, papermaking, cosmetics, biomedical material and food industry ect. are summarized. In addition, the prospect of its application in the leather industry is stated. Note de contenu : - COLLAGEN : The structure of collagen - The functional characteristics of collagen - THE CHEMICAL MODIFICATION OF COLAGEN : Cross-linking modification - Group modification - Graft modification - THE APPLICATION OF MODIFIED COLLAGEN : Leather industry - Papermaking additives - Cosmetics - Biomedical material - Food industry - Others - PROPECT FORECAST En ligne : https://drive.google.com/file/d/1snCJYNAQ-9VYDnjOOQkCqyACeC7pqukj/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24647 [article]

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