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675 : Technologie du cuir et de la fourrure |
Ouvrages de la bibliothèque en indexation 675
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Mechanism of collagen processed with urea determined by thermal degradation analysis / Keyong Tang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 10 (10/2020)
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Titre : Mechanism of collagen processed with urea determined by thermal degradation analysis Type de document : texte imprimé Auteurs : Keyong Tang, Auteur ; Weilin Li, Auteur ; Jie Liu, Auteur ; Cheng-Kung Liu, Auteur ; Hongbo Pan, Auteur Année de publication : 2020 Article en page(s) : p. 380-389 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Collagène
Collagène -- Détérioration
Cuir nappa
PyrolyseLa pyrolyse est la décomposition ou thermolyse d'un composé organique par la chaleur pour obtenir d'autres produits (gaz et matière) qu'il ne contenait pas. L'opération est réalisée en l'absence d'oxygène ou en atmosphère pauvre en oxygène pour éviter l'oxydation et la combustion (L’opération ne produit donc pas de flamme). Il s'agit du premier stade de transformation thermique après la déshydratation.
Elle permet généralement d'obtenir un solide carboné, une huile et un gaz. Elle débute à un niveau de température relativement bas (à partir de 200 °C) et se poursuit jusqu'à 1 000 °C environ. Selon la température, la proportion des trois composés résultants est différente.
UréeIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : During the beamhouse process for nappa leather, pelts are usually limed with amino compounds such as urea, ethylenediamine, and triethanolamine. However, the interaction between amino compounds and collagen is not well known. In this work, collagen fibers were soaked in various concentrations of urea and the thermal degradation of collagen fibers were studied by the methods Horowitz-Metzger and Coats-Redfern. The mechanism of the reaction between urea and collagen fibers is discussed, wherein the thermal degradation activation energy first decreases and then increases. The lowest thermal degradation activation energy of urea processed collagen appears at 2-3 mol/L urea, suggesting that the stability of collagen is the poorest when the pelt is processed in the urea solution. At the urea concentration above 6 mol/L, the thermal degradation activation energy of the sample is similar to samples without urea processing and the higher concentrations does not have the same effect as lower concentrations of urea. The collagen fibers with a urea processing history were washed to remove the urea in them, and the samples were studied again for their thermal degradation behavior. The results indicated that the thermal degradation activation energy of the collagen fibers might recover to the unprocessed level. Therefore, it was suggested that the reaction between urea molecules and collagen fibers is reversible. Urea molecules might help to destroy some of the hydrogen bonds between collagen peptides in the urea solution. After the urea is washed out, the structure of the collagen will return to its original state, because the hydrogen bonds might be reconstructed. Note de contenu : - EXPERIMENTAL : Materials and apparatus - Preparation of urea solutions - Preparation of different CCFs - TG/DTG analysis and data processing
- RESULTS AND DISCUSSION : Thermal degradation behaviors of urea processed collagen fibers - Influence of water washing on the urea-processed CCFsDOI : https://doi.org/10.34314/jalca.v115i10.4172 En ligne : https://drive.google.com/file/d/1nmmnQ02Lho0CulCfzsKaRlV-3YIetnwB/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34613
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Code-barres Cote Support Localisation Section Disponibilité 22361 - Périodique Bibliothèque principale Documentaires Disponible Mechanism of the influence of the fatliquor on the bio-decolourization of an azo dye / Li Yanchun in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 4 (07-08/2015)
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Titre : Mechanism of the influence of the fatliquor on the bio-decolourization of an azo dye Type de document : texte imprimé Auteurs : Li Yanchun, Auteur ; Zheng Liwen, Auteur ; Yulu Wang, Auteur Année de publication : 2015 Article en page(s) : p. 163-171 Note générale : Abbrev. - Bibliogr. Langues : Anglais (eng) Catégories : Colorants azoïques
Décoloration
Poly-3-hydroxybutyrate
Poly-B-hydroxybutyrate
Produits de nourriture du cuirIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : In the treatment of tannery wastewater, other chemical agents such as tannins and fatliquors may possibly have an influence on bio-decolourization of dyes, few researchers have addressed that problem. This paper reports how four kinds of commercial fatliquors influence the bio-decolourization of an azo dye (Acid Fuchsin 6B as the experimentat object) and expounds the mechanisms of these influence processes. it was obvious that the addition of sulfonated fatliquor and oxidized-sulfited fatliquor have improved the bio-decolourization activity of Acid Fuchsin 66, by contrary, the bio-decolourization of the dye has been stopped virtually by the addition of Lecithin based fatiguer and Phosphoric esters fatliquor. The paper used LC/MS to analyze and quantify metabolites of the dye in various substrates. The results certify that a stimulation of degradation products of these fatliquors on the breaking of the azo linkage contributes to the improvement of the bio-decolourization of the azo dye. And according to the correlation coefficient of the poly-?-hydroxybutyrate production with the residual concentrations of the dye, the inhibition of the fatliquors with phosphate groups on the bio-decolourization is directly due to the formation of the poly?-p-hydroxybutyrate. Note de contenu : - EXPERIMENTAL DETAILS : Materials - Inoculum - Bio-decolourization of acid fuchsin 6B and biodegradation of the fatliquors
- ANALYTICAL METHODS
- RESULTS AND DISCUSSION : The bio-decolourization of acid fuchsin 6B using various fatliquors as the co-substrates - The mecanism of the improvement by the fatliquor to the biological decolourization - The inhibition mechanism of the fatliquor on the biological decolourizationEn ligne : https://drive.google.com/file/d/1aBdd2k-VrWaSTOxOcAXUxL2fOFkMYz7Z/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24557
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Code-barres Cote Support Localisation Section Disponibilité 17358 - Périodique Bibliothèque principale Documentaires Disponible Mechanisms and benefits of upgrading technologies in finishing / Loyd J. Burcham in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. C, N° 6 (06/2005)
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Titre : Mechanisms and benefits of upgrading technologies in finishing Type de document : texte imprimé Auteurs : Loyd J. Burcham, Auteur ; Diamano Cracco, Auteur Année de publication : 2005 Article en page(s) : p. 209-216 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Upgrading of leather crusts that have been damaged by hide defects such as tick bites, scars, and other imperfections remains a high priority in leather finishing because it enables manufacturers to improve the overall quality of their finished leather. The present study uses surface mapping techniques to characterize samples of upgraded full-grain leathers prepared by reverse roll-coating (RRC) and hand stucco application methods. Specific techniques used for surface characterization included Impulse Thermography for surface thermal properties, FTIR mapping for surface chemical properties, dynamic contact angle mapping for surface tension, and scanning-electron and optical microscopy for surface morphology. It was found that the RRC method results in an upgraded crust surface that exhibits very uniform surface properties across the entire surface and in both defect and non-defect areas. By contrast, hand stucco results in a non-uniform crust surface with extremely discontinuous surface properties between defect and non-defect areas. Moreover, adjustments in the RRC add-on coat weight allow for selective and exclusive defect filling while maintaining constant surface physical and chemical properties outside of defect areas through the presence of a thin binder film across the entire surface. Therefore, while the mechanism of upgrading in hand stucco is simply the filling of defects, the mechanism of RRC upgrading comprises the filling of defects plus homogenization of surface physical and chemical properties. These uniform surface properties created by RRC upgrading provide a unique benefit by "priming" the surface for efficient and uniform application of subsequent basecoats and topcoats. En ligne : https://drive.google.com/file/d/1FSLaE4BG3xcWOJ4gexwhapuJGJoVDPRJ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4059
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Code-barres Cote Support Localisation Section Disponibilité 002324 - Périodique Bibliothèque principale Documentaires Disponible Mechanistic studies of mineral tanning - Part I : / Anthony D. Covington in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 73 (Année 1989)
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Titre : Mechanistic studies of mineral tanning - Part I : : Solid state aluminium-27 NMR studies and the thermodynamics of shrinking Type de document : texte imprimé Auteurs : Anthony D. Covington, Auteur ; R. A. Hancock, Auteur ; I. A. Ioannidis, Auteur Année de publication : 1989 Article en page(s) : p. 1-8 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Aluminium-27 solid state NMR spectroscopy has been applied to investigate the interactionat the molecular level of various aluminium based tanning salts with leather. High resolution and variable temperature Al-solid state NMR studies, combined with differential scanning calorimetry and kinetic studies of the shrinking of Al-tanned hide powder and sheepskin samples have clearly shown that shrinking is a kinetically controlled process, during which the synthetic crosslinks remain intact. The shrinkage temperature is determined by the size of the formed crosslinked macromolecular moieties which in turn depends on the kinetics stability of the interactions of the tanning agent with collagen. En ligne : https://drive.google.com/file/d/1nWW_-bJbgR1Pfd3BbI_FsAWZj_n39ZNi/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8812
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Code-barres Cote Support Localisation Section Disponibilité 007136 - Périodique Bibliothèque principale Documentaires Disponible Medium optimisation for bioflocculant produced from bacillus cereus / Changqing Zhao in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 3 (05-06/2017)
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Titre : Medium optimisation for bioflocculant produced from bacillus cereus Type de document : texte imprimé Auteurs : Changqing Zhao, Auteur ; Che Chun, Auteur ; Yang Qinhuan, Auteur Année de publication : 2017 Article en page(s) : p. 129-134 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biomatériaux
Eaux usées -- Epuration
Floculant
Floculation
SelsIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : This paper further investigated a previous study that discovered a strain of Bacillus camus with a flocculation effect. Based on the initial medium, single-factor experiments were carried out to optimise the carbon and nitrogen sources and their concentrations. Inorganic salts with differing concentrations were successively tested through single factor, orthogonal, and composite experiments, from which an optimal medium recipe was determined with the highest flocculation activity. Next, the flocculation activity and yield of the bioflocculant were compared between the optimal medium and the initial medium. The results showed that 40g/L mannitol was the optimal carbon source, and 4g/1._ peptone was the optimal nitrogen source, white 0.75g/L l<21-1PO4 was the highest amongst the inorganic salts. Considering the carbon sources, nitrogen sources, and inorganic salts, the optimal medium with the highest flocculation activity was 40g/L mannitol, 4g/L peptone, and 0.75g/L K2HPO4. It was found that the optimal medium increased the yiefd of the bioflocculant produced by Bacillus cereus by 189.70% and the flocculation activity by 58.87%, which was a significant improvement. These experimental results are of great importance in increasing the efficiency of wastewater treatment and reducing the cost of bioflocculant. Note de contenu : - MATERIALS AND METHODS : Experimental strains and media - Strain inoculation - Determination of flocculation - Single factor optimisation of carbon source - Single factor optimisation of the nitrogen source - Optimisation of inorganic salts - Comparison of the effects of the optimised and the initial medium
- RESULTS AND DISCUSSION : Optimisation of carbon source - Optimisation of nitrogen source - Optimisation of inorganic salts - Comparison of the effects of the initial medium and the optimised mediumEn ligne : https://drive.google.com/file/d/1IYo2vy4BMYcJJGVtu2m_ZLhW1jwDa0yH/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28797
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Code-barres Cote Support Localisation Section Disponibilité 19049 - Périodique Bibliothèque principale Documentaires Disponible Mesure de la perméabilité à la vapeur d'eau du cuir et de ses substituts / H. Pavelkova in REVUE TECHNIQUE DES INDUSTRIES DU CUIR, Vol. LXIV (Année 1972)
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PermalinkA method and principle of soft and transparent leather manufacturing / Xiu He in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 11 (11/2023)
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PermalinkMethod for calculation of total composition of leather / A. W. Landmann in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. N° 71 (Année 1987)
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PermalinkA method for measuring shrinkage temperature of leather / Ning Duo in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 95, N° 5 (09-10/2011)
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PermalinkA method for removing adobe-type manure from hides using an oxidizing agent / Ryan M. Marsico in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 3 (03/2017)
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PermalinkMethod for the determination of zirconium-iuc 13 / A. W. Landmann in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 59, N° 1 (01-02/1975)
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PermalinkA method of bleaching collagenous materials / D. E. Peters in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXI (Année 1986)
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PermalinkA method of processing fresh butcher-hogskins / William J. Hopkins in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXX (Année 1985)
PermalinkMethod to extract water-soluble collagen from induced biphasic commercial gel / Matthew J. Mastauskas in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 7 (07/2012)
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PermalinkPermalinkMéthode rapide de dosage des matières grasses dans les cuirs et extension à la délipidation / J. Rouzet in TECHNICUIR, (Années 1969-1970)
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PermalinkUne méthode simple de la détermination de la solidité de la teinture d'un cuir / W. Fischer in TECHNICUIR, N° 7 (11/1973)
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PermalinkMéthodes d'analyse des lipides dans les peaux d'ovins / Pierre Bourgeat in TECHNICUIR, N° 4 (04/1976)
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PermalinkMéthodes d'analyse physique des cuirs in REVUE TECHNIQUE DES INDUSTRIES DU CUIR, Vol. LXVI (Année 1974)
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PermalinkMéthodes de détermination et de contrôle de la résistance du cuir à l'eau et aux autres agents extérieurs / R. Desgrippes in TECHNICUIR, N° 8 (10/1973)
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