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binders cross-linked with polyaziridine. Study of cross-linked polymers for aqueous finishing. Part III : influence of a cationic pre-bottom / Lluis Ollé in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 3 (05-06/2009)
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Titre : binders cross-linked with polyaziridine. Study of cross-linked polymers for aqueous finishing. Part III : influence of a cationic pre-bottom Type de document : texte imprimé Auteurs : Lluis Ollé, Auteur ; E. Borrà s, Auteur ; Mira Cobos, Auteur ; Josep Maria Morera, Auteur ; M. Dolors Borras, Auteur ; Anna Bacardit, Auteur Année de publication : 2009 Article en page(s) : p. 91-96 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The leather industry needs innovative products and processes to satisfy the requirements of a continuously evolving global market. Modern leathers are processed to very stringent technical specifications so that they will meet end use requirements. In most cases, to fulfil current demands for leather with very fastness, the use of cross-linkers is needed.
Due to differences in the manufacturing processes of polyurethanes and acrylic binders, their structural differences, and the type of tanned and retanned leather being used, variations in cross-linking may occur. Quality discrepancies will therefore be observed in the finished leather.
This study explores the influence of a cationic pre-bottom on the cross-linking reaction of polyaziridine, as well as the influence of the type of polymer employed and the type of tannage and retannage effected on the amount of cross-linker needed to improve wet physical properties of the finishing.
A comparison of results shows that the application of a cationic pre-bottom improves fastness to wet rub, this improvement being most significant in polyurethane rather than in acrylic binders. Furthermore, the cationic prebottom provides beter results when working with resin-synthetic-vegetable retanned leather and vegetable leathers. However, different amounts of polyaziridine are needed with regard to the content of carboxylic acid groups of the polymers being used.En ligne : https://drive.google.com/file/d/1_vAFG39wvCNrj5Axv_7qzNT9PhfrjBXm/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5937
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 3 (05-06/2009) . - p. 91-96[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 011443 - Périodique Bibliothèque principale Documentaires Disponible Liming process using hydrogen peroxide / Josep Maria Morera in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 81, N° 2 (03-04/1997)
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Titre : Liming process using hydrogen peroxide Type de document : texte imprimé Auteurs : Josep Maria Morera, Auteur ; Esther Bartoli, Auteur ; M. Dolors Borras, Auteur ; D. Munoz, Auteur ; F. J. Jiménez, Auteur ; Agusti Marsal, Auteur Année de publication : 1997 Article en page(s) : p. 70-73 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this work, the feasibility of an oxidative liming process with hydrogen peroxide in alkaline medium was studied. The possible reduction in water consumption by float recyclinbg and in effluent loadings by precipitation and separation of proteins contained inthe liming effluents were also investigated.
On the basis of preliminary trials, a second order central rotatable design as a function of both the hydrogen peroxide offer and the mechanical action of the drum, was applied to detemrine the variation of selected physical properties of chrome leather previously subjected to the oxidative liming process. This process was compared with a conventional liming process with sodium sulphide and calcium hydroxide.
Subsequently, a study on the quantification of water consumption as well as analyses of COD, soluble solids and suspended matter of the resulting wastewater were carried out for a given hydrogen peroxide offet and drum mechanical action.En ligne : https://drive.google.com/file/d/16-g98ChCQaqwB-yjvGACvAsbXrMuf93F/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8055
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 81, N° 2 (03-04/1997) . - p. 70-73[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007015 - Périodique Bibliothèque principale Documentaires Disponible A new methodology for the rapid determination of chromium in tanning floats / M. Dolors Borras in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 84, N° 2 (03-04/2000)
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Titre : A new methodology for the rapid determination of chromium in tanning floats Type de document : texte imprimé Auteurs : M. Dolors Borras, Auteur ; J. M. Morera, Auteur ; A. Rius, Auteur ; R. M. Romero, Auteur Année de publication : 2000 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bains de tannage -- Teneur en chrome
Chimie analytiqueIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A method for the determination of chromium in tanning floats is presented in this paper. The new method is based on spectrophotometry and multivariate calibration. Its main characteristics are rapidity and the fact that only deionized water is used as reagent. The sample is first diluted and then the visible spectrum is recorded. The spectrum is related to the chromium concentration in the sample through the use of a calibration function previously calculated by Partial Least Squares (PLS). The results obtained are comparable to those obtained by the classical methodology in terms of accuracy (3.3%). Systematic errors are not detected at a 95% confidence level. Note de contenu : - Theoretical background : Multivariate calibration
- Experimental : Instrumentation - Software - Samples - Reagents and procedures
- Table 1 : Reference and predicted concentration of chromic oxide for the 23 samples used. The relative error for each sample is also shownEn ligne : https://drive.google.com/file/d/1fcdf4m8V2FG2V2BOYU6GoCDgOMo2QZmY/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41462
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 84, N° 2 (03-04/2000)[article]Exemplaires
Code-barres Cote Support Localisation Section Disponibilité aucun exemplaire Oxidative unhairing of leathers : Influence of several process parameters and environmental improvments / Josep Maria Morera in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 10 (10/2006)
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Titre : Oxidative unhairing of leathers : Influence of several process parameters and environmental improvments Type de document : texte imprimé Auteurs : Josep Maria Morera, Auteur ; Esther Bartoli, Auteur ; M. Dolors Borras, Auteur ; Stefan Banaszak, Auteur Année de publication : 2006 Article en page(s) : p. 347-354 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The aim of this project was to develop a type of unhairing using hydrogen peroxide, commercial amine and enzyme products. This unhairing system, which was carried out on a pilot plant scale, enables hair recovery and recirculation of floats in order to save water. The effect of the amine and enzyme products on the properties of vegetable-tanned leather was studied. In addition, five more consecutive unhairing processes were carried out by recirculating the effluents and reusing them according to their composition. After analysing the floats, the results obtained were compared to those achieved by using a reductive unhairing process with hair recovery. The results showed a 65 percent saving of water and a 97 percent decrease in toxicity. These results were compared with the bibliographical values of a reductive unhairing with hair dissolution. En ligne : https://drive.google.com/file/d/19TBlxk1RnQplSfN6NIbvREAczgVA0w3C/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3972
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Code-barres Cote Support Localisation Section Disponibilité 005680 - Périodique Bibliothèque principale Documentaires Disponible Study on an unhairing process with hydrogen peroxide and amines / Agusti Marsal in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCV, N° 1 (01/2000)
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Titre : Study on an unhairing process with hydrogen peroxide and amines Type de document : texte imprimé Auteurs : Agusti Marsal, Auteur ; Josep Maria Morera, Auteur ; Esther Bartoli, Auteur ; M. Dolors Borras, Auteur Année de publication : 2000 Article en page(s) : p. 1-10 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this work, the feasibility of an unhairing process with hydrogen peroxide and amines as an alternative to the conventional unhairing process was considered. A second order central rotatable design for two variables was applied to study the influence of both hydrogen peroxide and amine offers on the characteristics of chromed tanned leather. Likewise, the possible float recycling after protein precipitation and separation by filtration from the unhairing bath was considered. Subsequently, a study on the quantification of water consumption and analysis of the resulting wastewater was carried out for a given hydrogen peroxide and amine offer. En ligne : https://drive.google.com/file/d/15yUcIt516_L_3sMMT6X_XD_xpIzVC_Hp/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4405
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Code-barres Cote Support Localisation Section Disponibilité 006980 - Périodique Bibliothèque principale Documentaires Disponible Vegetable-zinc combination tannage on lamskin / Josep Maria Morera in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 80, N° 4 (07-08/1996)
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