Auxiliary agents with non-swelling capacity used in pickling-tanning processes. Part 2 / Ramón Palop in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 86, N° 5 (09-10/2002)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 86, N° 5 (09-10/2002) . - p. 203-211 Titre : Auxiliary agents with non-swelling capacity used in pickling-tanning processes. Part 2 Type de document : texte imprimé Auteurs : Ramón Palop, Auteur ; Agusti Marsal, Auteur Année de publication : 2002 Article en page(s) : p. 203-211 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents anti-gonflement Cuirs et peaux Picklage Le picklage consiste à faire absorber à la peau en tripe une quantité importante d'acide, en présence de sel neutre (NaCl) pour réprimer le gonflement que provoquerait l'acidité du milieu. Sulfoniques, Acides Tannage Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The use of different types of aromatic sulphonic acids, known as "non-swelling acids" has been suggested by many authors in order to avoid swelling when the pickling operation is completed with sulphuric and/or formic acid. G.Otto studied the influence of 16 aromatic sulphonic acids and their salts on the swelling of hides during the pickling process. He found that the acid swelling of the leather diminishes in sulphonic acids containing only one ring and an increased dipolar activity. Sulphonic acids with two rings and a high dipolar activity repress swelling in an even more remarkable way. In a previous paper, we studied the capacity of four commercial products to prevent acid swelling: polyacrylic acid ; naphthol 3-6-disulphonic acid; p-hydroxydiphenyl sulphonic acid and a blend of naphthalene and naphthol sulphonic acids (chemical A). On the basis of the results obtained, we concluded that an offer of 3% (on pelt weight) of the four products studied reduced swelling after pickling at salinity values of 0 ̊, 1 ̊ and 2 ̊ Bé. However, after tanning and dyeing, Chemical A provided the best results since, at a salinity of 2 ̊Bé, it prevented swelling sufficiently, gave rise to a good shrinkage temperature and did not reduce the colour too much when compared with the standard pickling process(L* = 50 against 42). In this part of the work, the application conditions for chemical A which were determined in the previous paper with hide pieces are here optimised for whole hides. First of all, a pickling process with chemical A is compared to a standard pickling process. Subsequently, the tanning process of hides treated with Chemical A and subsequently pickled is more deeply studied. Note de contenu : - EXPERIMENTAL PROCEDURE : Optimisation of application conditions of chemical A - RESULTS : Standard pickling process vs a pickling process with chemical A - Improvement of the tanning process - Variations in the process with chemical A and chemical C - Comparative study between the process with chemicals A and C and the standard (Reference) process - Table 1 : Process using a blend of naphthalene and naphthol sulphonic acids (chemical A) compared with a standard process - Table 2 : Process using chemical A and a strongly masked chromium salt (chemical C) - Table 3 : Process using chemicals A and C compared with a standard process - Table 4 : Evaluation of the residual bath and the wet-blue leather obtained with the standard process and the process with chemical A - Table 5 : Evaluation of the organoleptic and mechanical properties of leathers obtained with the standard process and the process with chemical A - Table 6 : Evaluation of the residual bath and the wet-blue leather obtained with the standard process and the process using chemicals A and C - Table 7 : Evaluation of the organoleptic and mechanical properties of leathers obtained with the standard process and the process with chemical A and C En ligne : https://drive.google.com/file/d/1efWw-7m3HRsXP5cXmGwNrwsK7EWQmS_C/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39860 [article]

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Effect of pickling materials on leather quality from a hide surface charge perspective / Tianqi Yang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 7 (07/2022)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 7 (07/2022) . - p. 279-287 Titre : Effect of pickling materials on leather quality from a hide surface charge perspective Type de document : texte imprimé Auteurs : Tianqi Yang, Auteur ; Yunhang Zeng, Auteur ; Qingyong Sun, Auteur ; Chao Lei, Auteur ; Bi Shi, Auteur Année de publication : 2022 Article en page(s) : p. 279-287 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composés aromatiques Croûte (cuir) On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés. Cuirs et peaux -- Propriétés physiques Pénétration cutanée Picklage Le picklage consiste à faire absorber à la peau en tripe une quantité importante d'acide, en présence de sel neutre (NaCl) pour réprimer le gonflement que provoquerait l'acidité du milieu. Sulfoniques, Acides Tannage au chrome Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Salt-free pickling technology has recently received increased attention because it produces much lower salt pollution than the conventional pickling technology using formic acid, sulfuric acid, and sodium chloride. However, the existing salt-free pickling materials, for instance, aromatic sulfonic acids (ASAs), lead to reduced leather quality and the reason behind this phenomenon is unclear. In this study, we explored how ASAs affect the properties of tanned leather. Results showed that typical ASAs, such as 5-sulfosalicylic acid, 1,5-naphthalenedisulfonic acid, and 2-naphthalenesulfonic acid, penetrated cattle hide more slowly compared with formic and sulfuric acids because of their large molecular weight and strong intermolecular interactions with hide collagen. ASAs decreased the positive charge of the pickled hide via interactions with their sulfonic acid groups, resulting in the increased adsorption rate of chrome tanning agent to the hide surface. Rapid tanning agent adsorption could impede the deep penetration and uniform distribution of the agent in the ASA-pickled hide. Thus, the properties of wet blues and crust leathers pickled with ASAs are inferior to those of wet blue and crust leather pickled using conventional pickling materials. Our results indicate that a strongly positive charge of the pickled hide is vital to obtaining high-quality leather and provide insights into salt-free pickling materials from a hide surface charge perspective. Note de contenu : - EXPERIMENTAL : Materials - Pickling experiments - Analyses of pickling performance - Analyses of chrome tanning performance - Determination of the physical properties of crust leather - RESULTS AND DISCUSSION : Penetration of various acids into hide - Surface charge properties of hides pickled with various acids - Hydrothermal stability and fiber dispersion of hides pickled with various acids - Effect of pickling materials on chrome tanning performance - Effect of pickling materials on the physical properties of crust leathers - Table 1 : Pickling and chrome tanning processes - Table 2 : Pseudo-first-order and pseudo-second-order kinetic parameters for chrome adsorption - Table 3 : Physical properties of crust leathers DOI : https://doi.org/10.34314/jalca.v117i7.5962 En ligne : https://drive.google.com/file/d/1UhajIthtPvDv2bquUbfxlI9pj2WugNC8/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37820 [article]

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Etudes des propriétés dispersantes des produits de condensation des acides naphtalène sulfoniques / Hamid Aleboyeh in L'ACTUALITE CHIMIQUE, N° 6 (06/1999)  

[article]  inL'ACTUALITE CHIMIQUE > N° 6 (06/1999) . - p. 10-15 Titre : Etudes des propriétés dispersantes des produits de condensation des acides naphtalène sulfoniques Type de document : texte imprimé Auteurs : Hamid Aleboyeh, Auteur ; Serge Walter, Auteur ; Néji Ladhari, Auteur ; Azam Aleboyeh, Auteur Année de publication : 1999 Article en page(s) : p. 10-15 Note générale : Bibliogr. Langues : Français (fre) Catégories : Adsorption Agents dispersants (chimie) Colorants Produits de condensation (chimie) Sulfoniques, Acides Index. décimale : 547 Chimie organique : classer la biochimie à 574.192 Résumé : This work deals with the use of the dinaphtylmethanedisulfonic acid sodium salt as a dispersing agent for dyestuffs. Is it produced naphtalène sulfonation in oleum, followed by condensation with formaldehyde and subsequent neutralization by caustic soda. The properties of the obtained products are discussed as dependent on processing conditions. The origins of the main parameters ruling the dispersant effect, dispersion stability and dying power on polyester material are examined. The results show that the presence of remaining naphtalene does no modify significantly the adsorption speed on dyestuff particles. The samples made of naphtalene-2 sulfonic acid show excellent dispersant properties. Naphatalene-1 sulfonic acid derivatives show higher adsorption rates. The simultaneous presence of both acids thus leads to good properties of the final product. With high molecular weight, high condensation degrees result in very good absorbtion behaviour of the dyestuff in textile fibers. En ligne : https://new.societechimiquedefrance.fr/numero/etudes-des-proprietes-dispersantes [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7562 [article]

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Methods for managing chrome in leather making / Florian Doeppert in LEATHER INTERNATIONAL, Vol. 213, N° 4816 (11-12/2011)  

[article]  inLEATHER INTERNATIONAL > Vol. 213, N° 4816 (11-12/2011) . - p. 40-42 Titre : Methods for managing chrome in leather making Type de document : texte imprimé Auteurs : Florian Doeppert, Auteur ; Jan-Tiest Pelckmans, Auteur ; Markus Hess, Auteur ; Jürgen Christner, Auteur Année de publication : 2011 Article en page(s) : p. 40-42 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chrome hexavalent Picklage Le picklage consiste à faire absorber à la peau en tripe une quantité importante d'acide, en présence de sel neutre (NaCl) pour réprimer le gonflement que provoquerait l'acidité du milieu. Polysulfones Sulfoniques, Acides Tannage Tannage au chrome Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Note de contenu : - Fixation of chromium in wet-blue - Pickling and tanning with polysulphonic acids - Chromium exhaustion and fixation - Prevention of chromium (VI) En ligne : https://drive.google.com/file/d/16lh3Sh30l9Pa6lNfnQhywFM0YGxMaMSK/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12757 [article]

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A novel recycling technology for chrome shavings : Application of non-swelling acids during dechroming process / Sadaqat Ali Chattha in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 8 (08/2024)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 8 (08/2024) . - p. 360-368 Titre : A novel recycling technology for chrome shavings : Application of non-swelling acids during dechroming process Type de document : texte imprimé Auteurs : Sadaqat Ali Chattha, Auteur ; Minghui Li, Auteur ; Xu Zhang, Auteur ; Piyu Peng, Auteur ; Chunxiao Zhang, Auteur Année de publication : 2024 Article en page(s) : p. 360-368 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chimie analytique Chrome -- Recyclage Cuirs et peaux -- Déchets -- Recyclage Déchromage Extraction (chimie) Récupération (Déchets, etc.) Sulfoniques, Acides Sulfurique, Acide Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : To separate and recycle collagen fibers and chromium from chrome shavings is important for the sustainable development of leather industry. However, the requirement of chromium content for a wide range of industrial applications of the recycled collagen fibers is limited to 50 mg/kg, which is challenging for the current dechroming methods. Hence, the goal of this work was to establish an efficient dechroming method to address this problem based on the OH-replacement and non-swelling acid application principles. In this study, the types of aromatic sulfonic acids and the parameters of the dechroming processes were optimized, and the tanning performance of the recycled chromium was investigated. The results indicated that disposal of the alkali treated chrome shavings with a mixed acids exhibited high dechroming extent and low extent of collagen hydrolysis, and the optimal ratio of sulfuric acid (20%) to optimized non- swelling acid-sulfone sulfonic acid was 7:1 at pH 1.0 and 25°C. The resultant collagen fibers retained their fiber structure and had a maximum hydrolysis extent of 10.6%, with a chromium content of 39.9 mg/kg. Additionally, the chromium in the dechroming filter liquor displayed good alkali precipitation property, and the chromium concentration of the precipitate’s supernatant satisfied the requirements for direct discharge, approximately 1.05 mg/L, and the recovered chromium exhibited good tanning performance. Therefore, the newly developed salt free chrome shavings treatment method is a promising resource recycling technology and may be helpful for the sustainable development of the leather industry. Note de contenu : - MATERIALS AND METHODS : Materials - Methods - Exploring the tanning performance of recycled chrome tanning agent - Analysis and testing - Scanning electron microscope analysis - RESULTS AND DISCUSSION : Chromium extraction - Utilization of products - Utilization of dechromed collagen fibers - Table 1 : Effect of acid types on filtration performance (min), moisture content (%) and dechroming extent (%) - Table 2 : Effect of sulfuric acid (20%, w/w) and SDPSA (50%, w/w) on filtration performance, moisture content, dechroming extent and extent of collagen hydrolysis DOI : https://doi.org/10.34314/brrhvf02 En ligne : https://drive.google.com/file/d/18NEdU3a_YjuWL6e-dbTQ9139bBWJRSSM/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41289 [article]

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Performance of sulfonated dimeric malenised soya fatty acid as a leather fatliquor / R. Janardhanan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 4 (04/2012)  

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The sulphonation of phenol-formaldehyde novolacs (Part 1) / J. Guthrie in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 66 (Année 1982)  

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Viscosity and retanning properties of isophthalic dihydrazide based amino resins under different reactant conditions / Rashid Saleem in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 97, N° 5 (09-10/2013)  

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