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)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 3 (05-06/2009) . - p. 91-96 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. Borràs, 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 : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5937 [article]

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Effect of ultrasound on several chromium tanning parameters / Josep Maria Morera in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 5 (05/2010)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CV, N° 5 (05/2010) . - p. 150-159 Titre : Effect of ultrasound on several chromium tanning parameters Type de document : texte imprimé Auteurs : Josep Maria Morera, Auteur ; Esther Bartoli, Auteur ; M. Serrano, Auteur ; F. Ccombalia, Auteur ; E. Borràs, Auteur ; Lluis Ollé, Auteur ; Anna Bacardit, Auteur Année de publication : 2010 Article en page(s) : p. 150-159 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Tannage au chrome Ultrasons Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Chrome tanning with ultrasound - This work studies the effect of several variables on a series of properties of the final leather obtained from chrome tanning, using ultrasounds as the sole mechanical effect during the tanning operation. The variables studied (at two levels by means of a 2 3 factorial design) are tanning temperature, condition of chrome offered (solid or dissolved) and salt basicity. Our studies indicate that the results obtained measuring parameters such as struck-through time of tanning agent, chromium uptake and its distribution, shrinkage temperature, tensile strength, tear load, grain distension and leather burst distention significantly depend on the previously selected level of one or more of the variables being studied. The study of the evolution of the concentration and basicity of the chromium salts has led us to conclude that reutilization is possible. Results show that ultrasound use in chrome tanning is a possibility to consider in the case of leather goods in which the use of drum may not be avisable. En ligne : https://drive.google.com/file/d/1VGwjmGwSc975iHa4k7Ssbw6iRGFjJTj9/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9364 [article]

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Epoxy resin cross-linked binders in aqueous finishing / Anna Bacardit in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 94, N° 1 (01-02/2010)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 94, N° 1 (01-02/2010) . - p. 1-8 Titre : Epoxy resin cross-linked binders in aqueous finishing Type de document : texte imprimé Auteurs : Anna Bacardit, Auteur ; M. Cobos, Auteur ; E. Borràs, Auteur ; Lluis Ollé, Auteur Année de publication : 2010 Article en page(s) : p. 1-8 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Finition Epoxydes Réticulation (polymérisation) Solutions aqueuses (chimie) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Nowadays, the leather industry needs to produce a very wide range of finished articles with different levels of performance to increase their competitiveness while minimizing their environmental impact. To reduce the negative effects on the environment a strong shift from solvent to water-based recipes has taken place in leather finishing. However, most of the water-based high-performance articles require the addition of a cross-linker 1-5 to improve wet-fastness properties. The aim of the present work is to study the cross-linking reaction between an epoxy cross-linker and both acrylic binders and polyurethanes. A comparison of results shows that epoxy resin improves wet rub fastness significantly. The cross-linking reaction evolves with time within 31 days storage. Moreover, different amounts of epoxy resin are required to obtain optimum values depending on the type of leather used on the physical characteristics of the binders employed. En ligne : https://drive.google.com/file/d/168I_fvS0bwyKi9SZnXa8nig-NYnqQsPO/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8304 [article]

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Study of the application of ultrasound in a vegetable tannage / Josep Maria Morera in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 11 (11/2010)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CV, N° 11 (11/2010) . - p. 369-375 Titre : Study of the application of ultrasound in a vegetable tannage Type de document : texte imprimé Auteurs : Josep Maria Morera, Auteur ; Esther Bartoli, Auteur ; Felipe Combalia, Auteur ; E. Borràs, Auteur ; Joan Carles Castell, Auteur ; Silvia Sorolla, Auteur Année de publication : 2010 Article en page(s) : p. 369-375 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux Tannage végétal Ultrasons Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : This study concerns the implementation and improvement of a system that applies ultrasound technology to vegetable tanning floats. The system is versatile and requires no major modifications or investment expense for tanneries. In particular, the study investigated grain fineness and fixation of tannins in relation to several mechanical approaches, which included : no mechanical effect (pits), drum, ultrasound, and ultrasound plus drum. A comparative study of energy expenses on the basis of the mechanical effect being used was also carried out. En ligne : https://drive.google.com/file/d/1h2CaLvs-ne65foGffvVXrrqEGGtocbwg/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10238 [article]

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