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A novel pickle-free high exhaust chrome tanning method-an appproach for tota dissolved solids management / Victor John Sundar in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 6 (11-12/2004)
[article]
Titre : A novel pickle-free high exhaust chrome tanning method-an appproach for tota dissolved solids management Type de document : texte imprimé Auteurs : Victor John Sundar, Auteur ; T. Rangasamy, Auteur ; Venkatasubramanian Sivakumar, Auteur ; Chellappa Muralidharan, Auteur Année de publication : 2004 Article en page(s) : p. 252-255 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chrome trivalent -- Absorption
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 organoleptiques
Déchets -- Réduction
Eaux usées -- Analyse
Tannage au chrome
Température de retrait
Totaux solides dissousLe total des solides dissous (TDS) est une mesure de la teneur combinée dissoute de toutes les substances inorganiques et organiques présentes dans un liquide sous forme moléculaire , ionisée ou microgranulaire (sol colloïdal) en suspension. Les TDS sont souvent mesurés en parties par million (ppm). Le TDS dans l'eau peut être mesuré à l'aide d'un compteur numérique. (Wikipedia)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Serious environmental concerns are being raised with respect to at high Total Dissolved Solids (TDS) contents in spent leather processing liquors. Pickling alone contributes about 35% TDS in the effluents. As cost effective treatments for TDS are not yet available, in-plant control has become a necessity. In the present work, a picklefree chrome tanning method has been coupled with in-situ neutralisation of acid generated during the hydrolysis of chrome salts. The elimination of pickling has given a significant reduction in TDS. Higher uptake and more uniform distribution of chromium in the leather are other benefits of the process. Chemical, physical and microscopical analyses indicate that the leathers’ properties are comparable with those of conventionally processed leathers. It is believed that this new approach could be gainfully employed to overcome the twin concerns of TDS and chromium in the effluent. Note de contenu : - MATERIALS AND METHODS
- PROCESS DETAILS : (All chemical offers are based on the fleshed weight) - Spent liquor analysis - Scanning Electron Microscopic (SEM) examination - Strength properties - Organoleptic properties - Colour value of dyed crust leathers
- RESULTS AND DISCUSSION : Spent tan liquor analysis - Shrinkage temperature and stratigraphic chromium distribution - Scanning Electron Microscopic (SEM) examination - Strength and Organoleptic functional property analysis - Colour value of dyed crust leathers
- Table 1 : Spent tan liquor analysis
- Table 2 : Analysis of wet-blue leathers
- Table 3 : Physical test characteristics of dyed crust leathers
- Table 4 : Organoleptic properties of wet-blue leathers
- Table 5 : Organoleptic properties of dyed crust leathers
- Table 6 : Colour values of dyed crust leather from reflectance measurementsEn ligne : https://drive.google.com/file/d/1QCx2Dhko62huH-NXEDagMdsX0l72qZy6/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39619
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 88, N° 6 (11-12/2004) . - p. 252-255[article]Phosphonium-zirconium combination tannage for goat garment leather / Qiang Tao-Tao in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 5 (09-10/2008)
[article]
Titre : Phosphonium-zirconium combination tannage for goat garment leather Type de document : texte imprimé Auteurs : Qiang Tao-Tao, Auteur ; Wang Xue-Chuan, Auteur ; Ren Long-Fang, Auteur ; Xu Jian-Xin, Auteur Année de publication : 2008 Article en page(s) : p. 192-199 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Propriétés chimiques
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux -- Propriétés organoleptiques
Cuirs et peaux -- Propriétés physiques
Cuirs et peaux de chèvres
Essais (technologie)
pH
Sulfate de tétrakis hydroxyméthyl phosphoniumLe sulfate de tétrakis hydroxyméthyl phosphonium est un myxobactéricide qui offre une prévention efficace contre les biofilms microbiens dans les eaux de traitement, et ce, pour une vaste gamme de micro-organismes formant des biofilms. Le sulfate de tétrakis (hydroxyméthyl) phosphonium agit principalement en augmentant la perméabilité de la membrane externe de l'enveloppe de la cellule microbienne, ce qui entraîne la libération rapide de protéines et d'autres substances cellulaires par les cellules. En outre, le sulfate de tétrakis (hydroxyméthyl) phosphonium inhibe le processus de sulfatoréduction dans les bactéries réductrices de sulfate.
Tannage combinéLe tannage combiné se dit des tannages qui allient deux familles ou genre de tannage pour obtenir un résultat additionnant les qualités complémentaires des tannins mis en œuvre par exemple Chrome-Végétal ou Chrome-Synthétique
ZirconiumIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A new tetrakis hydroxymethyl phosphonium sulphate (THPS)-zirconium combination tanning system has been developed. The optimum dosage of THPS, pickling pH and basifying pH were 2.0%, 3.5 and 5.0, respectively. The amount of THPS and zirconium sulphate were optimized at 2.0% and 2.5% (based on the pelt weight). The influence of ligands on the shrinkage temperature (Ts) of leathers has also been studied and the Ts of THPS alone and THPS-zirconium combination tanned leathers was much better than the relevant colour fastness to dry/wet rub of THPS alone tanned leathers.
Scanning electron microscopic studies show that the fibre weave of THPS-zirconium combination tanned leather was much closer than for THPS only tanned leather and the fibre weave of THPS-zirconium combination tanned leather was closer with an increase of amount of zirconium sulphate. Hence, this proves that the softness was reduced with an increase of the amount of zirconium sulphate and that the reactivity of zirconium sulphate with collagen fibre was very strong. The bulk trial carried out in Haining Shangyuan Leather Co., Ltd., proved that all indexes of the leather reached Chinese standard requirements.Note de contenu : - EXPERIMENTAL PROCEDURE : Materials - Determination of Ts - Optimization of the dosage of THPS - Optimizing pH - THPS-zirconium combination tanning - Physical testing and handle of leather - Test of Cr2O3, Cr6+ and formaldehyde content - Analysis with scanning electron microscopic (SEM)
- RESULTS AND DISCUSSION : Optimization of the dosage of THPS - Optimization of pH - Optimization of the dosage of zirconium retanning agent
- Fig. 1 : Relation of Ts and the dosage of THPS
- Fig. 2 : Relation of tensile strength and the dosage of THPS
- Fig. 3 : Relation of tear strength and the dosage of THPS
- Fig. 4 : Organoleptic properties of THPS alone tanned leathers
- Fig. 5 : Relation of TS and the dosage of zirconium sulphate
- Fig. 6 : Organoleptic properties of leathers tanned with THPS-zirconium
- Table 1 : Process to pickle and tan for wet salted goatskins
- Table 2 : Process topickle and tan and post tanning for garment leather
- Table 3 : Zirconium retanning process for garment leather
- Table 4 : Relation of pickling pH and penetration of THPS
- Table 5 : Relation of basifying pH and Ts
- Table 6 : Dyeing ability of THPS-zirconium combination tanned leather
- Table 7 : Physical-chemical properties of leathersPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35250
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 92, N° 5 (09-10/2008) . - p. 192-199[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21781 - Périodique Bibliothèque principale Documentaires Disponible Preparation and application of metanilic acid modified ecological melamine resins for making formaldehyde-free leather / Muhammad Naveed Ashraf in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 3 (05-06/2022)
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Titre : Preparation and application of metanilic acid modified ecological melamine resins for making formaldehyde-free leather Type de document : texte imprimé Auteurs : Muhammad Naveed Ashraf, Auteur ; Shahzad Maqsood Khan, Auteur ; Shahid Munir, Auteur ; Rashid Saleem, Auteur Année de publication : 2022 Article en page(s) : p. 126-136 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux -- Propriétés organoleptiques
Formaldéhyde -- Suppression ou remplacement
MélamineLa mélamine, de nom chimique 1,3,5-triazine-2,4,6-triamine, est parfois dénommée cyanuramide ou cyanurotriamine. Sa formule brute est C3H6N6.
Les "résines mélamine-formaldéhyde" ou "mélamine-formol" (sigle MF) sont appelées "mélamine" dans le langage courant. Elles font partie de la famille des aminoplastes qui regroupe des résines thermodurcissables aminées, issues d'un comonomère tel l'urée ou la mélamine, parfois le thiocarbamide, le cyanamide hydrogène ou le dicyandiamide ; le second comonomère étant le formaldéhyde.
RetannageIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The objective of this study is to develop a novel melamine based resin suitable for producing formaldehyde-free leather with improved retanning properties. A series of resins was prepared by condensation of melamine, glyoxal and metanilic acid at varied mole ratios of reactants. Prepared resins were evaluated for retanning performance in leather in comparison with a commercial melamine resin to select the optimal resin. The mechanical and organoleptic properties of the optimal resin were found to be better than those of the commercial melamine resin. Tensile strength, tear strength and elongation of leather were increased by 17.43 %, 10.41 % and 8.62 % in direction parai lel to backbone while the increase in these parameters was 15.17 %, 9.79 % and 6.0% respectively in direction perpendicular to the backbone at same dosages. 100% reduction of free formaldehyde content was apparent in retanned leather and in the effluent produced by novel melamine resin. Pollution load study of the effluent showed a reduction in chemical oxygen demand, total suspended solids and total dissolved solids by 9.21 %, 5.60 % and 6.97 % for the novel melamine resin reflecting its improved exhaustion. The fibre structure of the leather produced using the optimal melamine resin was arranged in a more orderly pattern as confirmed by scanning electron microscopy, thus showing its improved retanning capability. These results prove that the optimal melamine resin is an effective retanning agent suitable for producing formaldehyde-free leather with a reduction in effluent pollution load. This work also presents an alternative for formaldehyde for amino resins to address its carcinogenic effects. Note de contenu : - EXPERIMENTAL PROCEDURE : Chemicals and apparatus - Synthesis of metanilic acid modified melamine-glyoxal resins
- RESULTS AND DISCUSSION : Schematic route - Leather application of resins as retanning agent - Mechanical characteristics of retanned leather - Effect of melamine resins on organoleptic properties - SEM analysis - Quantitative determination of ree formaldehyde contents in leather - Thermogravimetric analysis (TGA) - FTIR analysis - Effluent analysis
- Table 1 : Mole ratio and physical characteristics of synthesised MGMNA resins
- Table 2 : Leather processing recipe conditions
- Table 3 : Mechanical characteristics of leather retanned with novel MGMNA resins and commercial resin
- Table 4 : Comparative characteristics of effluent for leathers retanned with novel resin MGMNA#09 and commercial melamine resinEn ligne : https://drive.google.com/file/d/1VlBcJdgglhf3cE0A5J6OugVIVuK_otgv/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37757
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 106, N° 3 (05-06/2022) . - p. 126-136[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23467 - Périodique Bibliothèque principale Documentaires Disponible Preparation and assistant-dyeing of formaldehyde-free amphoteric acrylic retanning agent / Jian zhong Ma in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)
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Titre : Preparation and assistant-dyeing of formaldehyde-free amphoteric acrylic retanning agent Type de document : texte imprimé Auteurs : Jian zhong Ma, Auteur ; Mengxin Wu, Auteur ; Zhenhua Tian, Auteur Année de publication : 2021 Article en page(s) : 13 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de tannage
Colorants -- Propriétés tinctoriales
Colorants acides
Composés amphotériques
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux -- Propriétés organoleptiques
Cuirs et peaux -- Propriétés physiques
Cuirs et peaux -- Propriétés thermiques
Cuirs et peaux -- Teinture
Environnement -- Etudes d'impact
Formaldéhyde
Glutaraldéhyde
Polyacryliques
Retannage
Tannage synthétiqueIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : With the enhancement of environmental protection consciousness, concerns have been raised about non-toxic and biodegradable leather retanning agents. According to the European standard 2002/231/EC, the free formaldehyde content of leather products should be less than 150 mg/kg. As one of the retanning agents in the market, the content of free formaldehyde in the Multifunctional retanning agent (MTA) is 372.22 mg/kg and higher than the limit value. In this work, glutaraldehyde as an alternative of formaldehyde was used to modify acrylic polymer and an amphoteric acrylic retanning agent was prepared. Then it was used in retanning process, and its retanning and assistant-dyeing properties were investigated. The results showed that the free formaldehyde content of amphoteric acrylic retanning agent modified with glutaraldehyde was only 4.17 mg/kg. Meanwhile, the presence of amino groups in the amphoteric acrylic retanning agent improved the dyeing properties of leather by electrostatic attraction. Compared with the leather treated with anionic acrylic retanning agent, the residual dye concentration of the dyeing effluent of the retanned leather with amphoteric acrylic retanning agent decreased from 17.4 mg/L to 10.0 mg/L, and the dyed leather had better resistances to friction and water-washing. In addition, the BOD5/COD value of the wastewater after Mannich base polymer retanning was only 0.32, indicating that the retanning agent was biodegradable. Moreover, the leather retanned with amphoteric acrylic retanning agent had good thermal stability, fullness and physical and mechanical properties. Note de contenu : - EXPERIMENTAL : Materials - Preparation of retanning agent - Application - Free formaldehyde content of leather - Free formaldehyde content of retanning agent - Leather surface color depth (K/S) - Color fastness to cycles of to-and-fro rubbing (wet/dry) - Color fastness to washing (discoloration) - Gain of leather - Physical-mechanical property - Softness
- RESULTS AND DISCUSSION : Amination degree - 1H NMR spectra - FT-IR spectra - Analysis of molecular weight and molecular weight distribution - Zeta potential - Free formaldehyde content - Thermal properties - Dyeing properties - Physical-mechanical properties of leathers - Organoleptic properties of leathers - Environmental impact assessments
- Table 1 : Specific operation of conventional and experimental processesa
- Table 2 : GPC results of GAMP, MTA and P
- Table 3 : The free formaldehyde contents of different retanning agents and corresponding retanned leathers
- Table 4 : Blackness of leather before and after washing with soapy water five times and whiteness of wet and dry interlining cloths rubbed on the dyed leathers
- Table 5 : Biochemical oxygen demand (BOD5) and Chemical oxygen demand (COD) of the wastewater after retanningDOI : https://doi.org/10.1186/s42825-021-00066-z En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00066-z.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37551
in JOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 13 p.[article]Preparation of formaldehyde-free melamine resins using furfural as condensing agent and investigation of their retanning performance / Muhammad Naveed Ashraf in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 103, N° 5 (09-10/2019)
[article]
Titre : Preparation of formaldehyde-free melamine resins using furfural as condensing agent and investigation of their retanning performance Type de document : texte imprimé Auteurs : Muhammad Naveed Ashraf, Auteur ; Shahzad Maqsood Khan, Auteur ; Shahid Munir, Auteur ; Rashid Saleem, Auteur Année de publication : 2019 Article en page(s) : p. 272-278 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuir -- Teneur en formaldéhyde
Cuirs et peaux -- Analyse
Cuirs et peaux -- Propriétés organoleptiques
Furfural
MélamineLa mélamine, de nom chimique 1,3,5-triazine-2,4,6-triamine, est parfois dénommée cyanuramide ou cyanurotriamine. Sa formule brute est C3H6N6.
Les "résines mélamine-formaldéhyde" ou "mélamine-formol" (sigle MF) sont appelées "mélamine" dans le langage courant. Elles font partie de la famille des aminoplastes qui regroupe des résines thermodurcissables aminées, issues d'un comonomère tel l'urée ou la mélamine, parfois le thiocarbamide, le cyanamide hydrogène ou le dicyandiamide ; le second comonomère étant le formaldéhyde.
Polymères -- Synthèse
Produits de condensation (chimie)
RetannageIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Sulfonated amino resins are an important class of polymers which are used as retanning agents in the leather industry. There is challenge for such resins to be synthesised without formaldehyde to satisfy the strict regulation in leather goods. In this work, formaldehyde-free melamine based retanning agents have been synthesised by acid catalysed process using furfural as condensing agent and sodium metabisulfite as the sulfonating agent. Sulfonated melamine furfural (SMFr) resins were synthesised using different molar ratio of melamine, sodium metabisulfite and furfural. Stable and water-soluble resins were produced without etherification.
The sodium metabisulfite to melamine ratio (SMB/M) was changed from 0.5-2.0 and furfural to melamine mole ratio (Fr/M) was varied from 2-6. The viscosity behaviour of the produced resins wâs evaluated with the increasing trend of sulfonation and increasing mole ratio of furfural to melamine. Functional group analysis and conversion of reactants into product was elucidated by FTIR.
Synthesised formaldehyde-free resins (SMFr) were comparatively evaluated as retanning agents on goatskin wet-blue against a commercially available sulfonated melamine formaldehyde (SMF) resin. The retanning performance of synthesised resins was studied and found better than that of the commercial SMF resin.Note de contenu : - EXPERIMENTAL PROCEDURE : Materials and equipment - Preparation of SMFr resin
- RESULTS AND DISCUSSION : Synthesis of SMFr resin - Viscosity trend of resins - Resin application on leather as retanning agent - Quantitative determination of free formaldehyde content in leather - Organoleptic properties of retanned leather - SEM examination (JEOL 6490) - Structure elucidation/FTIR spectroscopy analysis of SMFr resinEn ligne : https://drive.google.com/file/d/1tehL2heU-liowrx614fHL9jzpSdLCcXB/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33003
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Code-barres Cote Support Localisation Section Disponibilité 21222 - Périodique Bibliothèque principale Documentaires Disponible Production of carboxymethyl starches from oxidized starches and determination of their tanning characteristics / Hasan Ozgunay in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 6 (06/2021)
PermalinkQuality enhancement of low grade wet blue leathers : up-grading of thin substance in the wet end process / K. Gowthaman in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 9 (09/2012)
PermalinkReducing the use of volatile organic compounds in the leather industry / Rosa M. Cuadros in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 1 (01-02/2016)
PermalinkRemoval of proteoglycans in animal hides by glycosidase to promote opening-up of collagen fiber bundles : optimization of glycosidase and its application in the soaking process / Xiang Zhong in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 2 (02/2023)
PermalinkRole of anionic chromium species in leather tanning / Kumar Abhinandan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 10 (10/2021)
PermalinkSalinity reduction in the production of nappa skins by using agents with non-swelling capacity in pickling/tanning / Agusti Marsal in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 89, N° 6 (11-12/2005)
PermalinkSalt-free chromium tanning : Practical approaches / Murali Sathish in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 1 (01/2022)
PermalinkSalt free preservation of raw goat skin using swietenia mahogany (seed) extract / Md. Abdur Razzaq in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 2 (02/2022)
PermalinkShort-term hide preservation with acid and salt / Jaume Soler in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 3 (05-06/2018)
PermalinkSolving vein marks defects problem through wet end process / K. Gowthaman in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 9 (09/2014)
PermalinkStudies of ethiopian sheepskins as an opportunity for value addition, part II : optimization and characterization of wanke upper and garment leather / H. Mohammed in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 5 (05/2014)
PermalinkStudies on the physico-chemical behavior of synthetic tanning agents in non-aqueous medium / Gladstone Christopher Jayakumar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 8 (08/2017)
PermalinkSuitability of different oils for chamois leather manufacture / K. V. Sandhya in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 7 (07/2015)
PermalinkSupercritical carbon dioxide based skin preservation : solving the soak liquor effluent crisis of the leather industry / Arun Gopinath in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 4 (04/2020)
PermalinkA survey of current bookbinding leathers - Part 2 - organoleptic properties / R. S. Thomson in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 86, N° 6 (11-12/2002)
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