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Eco-friendly chrome tanning of leather using ultrasound technique / Mohamed Abu Sayid Mia in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 2 (02/2024)
[article]
Titre : Eco-friendly chrome tanning of leather using ultrasound technique Type de document : texte imprimé Auteurs : Mohamed Abu Sayid Mia, Auteur ; Shamima Yeasmin, Auteur ; Mohammad Nurnabi, Auteur ; Mohamed Zahangir Alam, Auteur Année de publication : 2024 Article en page(s) : p. 80-90 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption
Caractérisation
Cuirs et peaux de bovins
Tannage au chrome
UltrasonsIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : This article describes the development of an environmentally friendly chrome tanning process of leather using ultrasound. Most of the leathers are tanned by the conventional method using basic chromium sulfate. It is one of the most polluting and time-consuming steps in leather processing. Investigations were carried out on ultrasound assisted eco-friendly tanning process so that the chrome tanning agent could provide better quality leather. Effects of using ultrasound in chrome tanning process were studied at different pH, tanning time, tanning agent dosage, and then compared with that of conventional method. Tanned leathers were characterized by scanning electron microscopy (SEM), photomicrographic analysis, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and energy dispersive X-ray (EDX). SEM analyses of the surface and cross-section of the tanned leather showed that fiber structures were not affected by ultrasound. It was also found that the shrinkage temperature of leather tanned with ultrasound was increased by about 5-29 °C. Chrome uptake and content were found to increase by 30-50% and 1-7%, respectively. Tanning time was shortened from 6 hours to 2 hours and the quantity of leachable chromium in ultrasound assisted chrome tanned leather was also decreased significantly. The noteworthy enhancing effects have been attributed largely because of the increased penetration of tanning agents into pickled leather. Photomicrographic analysis of the cross-section of the tanned leather also showed a higher penetration of tanning agents in presence of ultrasound. Note de contenu : - EXPERIMENTAL : Materials - Experimental set-up - Tanning procedure of cow pickled pelt -
- Table 1 : Details of chrome tanning operation - Characterization of tanned leather - UV-visible spectrophotometry - Boiling test - Toxicity characteristic leaching procedure (TCLP)
- RESULTS AND DISCUSSION : Effect of ultrasound on percent chromium uptake of leather - Effect of time on chromium uptake - Chromium content in the tanned leather - Thermogravimetric analysis of tanned leather - Differential scanning calorimetric analysis of tanned leather - Boiling test of tanned leather - Field emission scanning electron microscopic (FESEM) analysis - Diffusion of tanning agent - Determination of leachable chromium content - Estimation of environmental benefits
- Table 1 : Details of chrome tanning operation
- Table 2 : Percentage of area loss of chrome tanned leather by boiling test
- Table 3 : Leachable chromium of tanned leather
- Table 4 : Amount of chromium present in the spent tanning liquorDOI : https://doi.org/10.34314/jalca.v119i2.8325 En ligne : https://drive.google.com/file/d/147dBUkJ8K0JJW0dvpb0wkO3ZNt_peH0W/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40468
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 2 (02/2024) . - p. 80-90[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24447 - Périodique Bibliothèque principale Documentaires Disponible Effect of an amphoteric chromium-free polymer retanning agent with reactive aldehyde groups on collagen fibers / Wang Xuechuan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 10 (10/2019)
[article]
Titre : Effect of an amphoteric chromium-free polymer retanning agent with reactive aldehyde groups on collagen fibers Type de document : texte imprimé Auteurs : Wang Xuechuan, Auteur ; Hao Dongyan, Auteur ; Xiaoye Chai, Auteur ; Li Ji, Auteur Année de publication : 2019 Article en page(s) : p. 373-381 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption
Agents de tannage
AldéhydesUn aldéhyde est un composé organique, faisant partie de la famille des composés carbonylés, dont l'un des atomes de carbone primaire (relié au plus à 1 atome de carbone) de la chaîne carbonée porte un groupement carbonyle.
L'aldéhyde le plus simple est le formaldéhyde (ou méthanal), aussi appelé formol lorsqu'il est en solution aqueuse.
Un aldéhyde dérive formellement d'un alcool primaire (oxydation) dont le groupement hydroxyde -OH est en bout de chaîne et se forme suite à l'enlèvement de deux atomes H d'où le nom "alcool déshydrogéné" ou aldéhyde.
Caractérisation
Chimie analytique
Colorants acides
Composés amphotériques
Composés organiques -- Synthèse
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 -- Teinture
Cuirs et peaux de moutons
Douceur (toucher)
Essais de résilience
Essais dynamiques
Frottements (mécanique)
Huiles et graisses -- Absorption
Liaisons chimiques
Polymères
Retannage
Tannage végétal
Température de retraitIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A chromium-free amphoteric polymer retanning agent was prepared by free radical polymerization reaction of undecylenic aldehyde (UAL), acrylic acid (AA) and dimethyl diallyl ammonium chloride (DADMAC) as raw materials. The structure of amphoteric polymer retanning agent was characterized by FT-IR and 1H-NMR. Amphoteric polymer retanning agent was applied to the retanning of vegetable-tanned light leather to investigate the binding ability of crust leather to anionic dyes, fat liquoring agent and physical-mechanical properties of the crust leather. The results showed that the synthesized amphoteric polymer retanning agent was successfully prepared. The application trial indicated that the amphoteric polymer retanning agent can improve the binding capacity between leather and anion dye and fat liquoring agent in the retanning process. The dye absorption rate of the crust leather was up to 99.58% and the dyeing liquor was clear. Furthermore, color of the crust leather was uniform and full and its K/S value and drywet rub fastness, thickening rate and physical-mechanical properties were higher than that of the retanned leather by acrylic resin retanning agent. In addition, the crust leather after retanning with amphoteric polymer retanning agent has good softness, and the absorption rate of fat liquoring agent was 99.62%. The above results showed that amphoteric polymer retanning agent possessed the good retanning property in vegetable tanned sheep garment leather. Note de contenu : - EXPERIMENTAL : Materials - Instruments - Synthesis of amphoteric polymer retanning agent (PADU) - Fourier Transform Infrared Spectroscopy (FT-IR) - Nuclear Magnetic Resonance Hydgogen Spectra (H-NMR) - Test of shrinkage temperature - Test of uptake of dye - Test of color strength (K/S) value - Test of dry and wet rub fastness - Test of absorption of fat liquoring agent - Test of softness - Test of thickening percentage - Test of tensile strength and tearing strength - SEM observation
- RESULTS AND DISCUSSION : FT-IR analysis - H-NMR analysis - Shrinkage - Contrast of bath before and after dyeing - Comparison of pictures of crust leathers retanned by different retanning agent - Dyeing properties of the crust leathers - Comparison of uptakes of fat liquoring agent in different crust leathers - Physical properties of crust leather - SEM observationEn ligne : https://drive.google.com/file/d/1ZhR1F8pIPUy_fgU3qYJV6V4qs6tezhHl/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33033
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Code-barres Cote Support Localisation Section Disponibilité 21208 - Périodique Bibliothèque principale Documentaires Disponible Effect of artiticial heat ageing on the humidity sorption of parchment and lathers compared with archeological samples / G. M. M. Abdel-Maksoud in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 84, N° 5 (09-10/2000)
[article]
Titre : Effect of artiticial heat ageing on the humidity sorption of parchment and lathers compared with archeological samples Type de document : texte imprimé Auteurs : G. M. M. Abdel-Maksoud, Auteur ; E. marcinkowska, Auteur Année de publication : 2000 Article en page(s) : p. 219-222 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorption
Adsorption
Antiquités (objets anciens) -- Analyse
Antiquités (objets anciens) -- Conservation et restauration
Cuirs et peaux -- Effets de l'humidité
Essais accélérés (technologie)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In Egypt there are many archaeological sites, museums, storehouses, old libraries and excavation areas. There are a large number of important parchment manuscripts and tanned leather (vegetable and chrome tanned leathers) artefacts that are in poor condition and at the same time are poorly preserved. This paper represents an attempt to experiment with artificial heat ageing at different temperatures (70°C, 100°C and 134°C) as an individual factor in following the changes in the ability of parchment and tanned leathers to absorb vapour water. These changes are compared with some samples of selected archaeolog ical parchment and tanned leathers in order to explain the deterioration mechanism of vapour water absorption so as to design and plan for the future conservation of parchment manuscripts and leather artefacts in Egypt.
The samples studied were placed with di-sodium hydrogen orthophosphate (Na,HPO 4’12H 20)in a desiccator and the humidity sorption was measured using a Mettler LP 16 Infrared Dryer. The results show that the humidity sorption of artificially aged samples was reduced as the time of ageing and temperature increased; and the humidity sorption of archaeological samples is adversely affected by the length of ageing and by environmental conditions. The results also show that the study of humidity sorption is vital in the field of conservation for studying deterioration and giving detailed information on parchment manuscripts and leather artefacts in order to facilitate the choice of an appropriate conservation treatment.Note de contenu : - Samples studied - New samples
- Archaeological samples
- Accelerated ageingEn ligne : https://drive.google.com/file/d/1u0gcgmjVjd2GRV1iOTjO_1Rf77krUDJf/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40921
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 84, N° 5 (09-10/2000) . - p. 219-222[article]Effect of fatliquoring on leather comfort. Part III : Moisture absorption-desorption of leather / Albert M. Manich in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 10 (10/2017)
[article]
Titre : Effect of fatliquoring on leather comfort. Part III : Moisture absorption-desorption of leather Type de document : texte imprimé Auteurs : Albert M. Manich, Auteur ; Joan Barenys, Auteur ; L. Martinez, Auteur ; J. Lloria, Auteur ; Josep Carilla, Auteur ; Agusti Marsal, Auteur Année de publication : 2017 Article en page(s) : p. 347-355 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption
Désorption
Huiles et graisses
Humidité
Produits de nourriture du cuirIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The comfort of tanned hide/skin is an added value, which is decisive for the choice of leather in articles for footwear or clothing, compared to other alternatives whose design excludes this component. This comfort is related to the capacity of absorption and desorption of moisture and with the physical, mechanical and organoleptic characteristics of the leather. After tanning, fatliquoring and retanning are the operations that more intensively modify the characteristics of leather articles.
This work is a continuation of two previous ones that have studied the influence of fatliquoring on softness and compressibility of leather and on grain and corium quality of leather assessed by ball bursting and tearing tests. In this case, the effect of fatliquoring on moisture absorption-desorption characteristics of leather is studied. The experimental work has been carried out in the pilot plant of Trumpler Española S. A. and the moisture absorption-desorption tests in the Laboratory of Thermal Analysis and Calorimetry of the IQAC. The behavior of non-fatliquored leather and that of leather fatliquored with a combination of sulphited triglycerides of colza oil and fatty polymer (TCSi/PGR) or fatliquored separately with their components TCSi and PGR, or with phosphoric ester ESF or sulphited fish oil Psi has been determined.
The determination of the size of the moisture absorbing monolayer (Xm), the binding energy constants of the monolayer C and the multilayer K, the maximum absorption capacity at saturation X1 and the hysteresis (Hyst.) between absorption and desorption, enabled us to classify the different fatliquoring agents according to stage (crust-blue, finished-red) by applying factorial analysis (see following graph). Finishing is the factor that best explains this behavior. Finishing decreases the size of the monolayer and increases the binding energy constants. Fatliquoring decreases the maximum absorption capacity and hysteresis, partially affecting the reduction of the monolayer size.Note de contenu : - INTRODUCTION : Absorption isotherms - Objective
- METHODS : Calculation of absorption and desorption isotherms - Specific surface of absorption - Hysteresis
- DISCUSSION : Monolayer size - Binding energy constant of the monolayer - Binding energy constant of the multilayer - Average hysteresis and maximum absorption capacity at saturation - Size of the absorption monolayer and apparent density - Ration between monolayer size estimations in desorption and absorption, and the mean hysteresis - Relationship between moisture absorption/desorption characteristics and tearing energyEn ligne : https://drive.google.com/file/d/1YhPToI0K4j6ES-VmHsYYK5P_PJn--Rx1/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29249
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Code-barres Cote Support Localisation Section Disponibilité 19286 - Périodique Bibliothèque principale Documentaires Disponible Effect of prepolymerization of acrylic acid under high gravity on the properties of acrylic resin retanning agent / Xin Shu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 11 (11/2019)
[article]
Titre : Effect of prepolymerization of acrylic acid under high gravity on the properties of acrylic resin retanning agent Type de document : texte imprimé Auteurs : Xin Shu, Auteur ; Weixing Xu, Auteur ; Bi Shi, Auteur ; Zhou Jian, Auteur Année de publication : 2019 Article en page(s) : p. 413-420 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption
Acide polyacrylique
Agents de tannage
Colorimétrie
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 mécaniques
Poids moléculaires
Point isoélectriqueEn biochimie, le point isoélectrique (pI) ou potentiel hydrogène isoélectrique (pHI) est le pH auquel une molécule est sous forme d'ion mixte ou, en physico-chimie, le pH d'une solution aqueuse dans laquelle un solide existe sous un potentiel électrique neutre.
En physico-chimie : Selon Bolger, le caractère acide ou basique d'une surface s'exprime par son point isoélectrique " Is ou IEPS (Iso Electric point for the surface) " ou point de charge nulle " PCN ou PZC (Point of Zero Charge) ", défini comme étant le pH de la solution aqueuse dans laquelle le solide existe sous un potentiel électrique neutre. Si le pH de la solution est basique, la surface est acide, et inversement. La différence entre le PZC et l'IEPS est basée sur le phénomène d'adsorption spécifique. On peut considérer que si la grandeur mesurée ne dépend pas de la solution utilisée pour la mesurer (pH, concentration, nature des ions), alors on a affaire à un PZC. Dans le cas contraire, c'est un IEPS que l'on mesure. Par exemple, quand la mesure de goutte sessile à deux liquides est utilisée, on considère en général qu'il n'y a pas adsorption des ions de cette goutte et que la goutte déplace complètement l'alcane qui sert de deuxième liquide: on est alors en présence d’un PZC. Au contraire, dans les mesures de potentiel d'écoulement (streaming potential), la solution joue un rôle important et c'est un IEPS que l'on mesure. Enfin, la charge nette se définit grâce au pH de la solution aqueuse dans laquelle la surface métallique existe, dans un état électriquement neutre (c’est-à -dire [M-OH2+ surf]=[M-O- surf]) et au PZC.
- Si pH < PZC alors la charge nette est positive
- Si pH > PZC alors la charge nette est négative.
Il existe plusieurs méthodes expérimentales permettant de décrire l’état acido-basique de la surface : la mesure du potentiel d’écoulement, la photoélectrochimie, la mesure de l’angle de contact, et la spectroscopie XPS.
PrépolymérisationConsiste à faire atteindre, à un élément drapé d'une pièce, un état de début de polymérisation suffisant pour acquérir la stabilité géométrique et la pégosité permettant sa manipulation.
Cette opération a également pour but de faciliter la mise en œuvre du produit, par exemple :
• limiter le fluage ;
• limiter le taux de matières volatiles ;
• diminuer le collant d'un préimprégné ...
Cette opération peut également consister à amorcer une légère polymérisation préalable à un mélange, une résine ou un préimprégné afin de le rendre plus adapté à sa mise en œuvre ultérieure.
La prépolymérisation permet le stockage de sous-ensembles d'une pièce en attendant l'assemblage en monophase à l'occasion de la polymérisation de l'ensemble des éléments de la pièce.Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The effects of prepolymerization of acrylic acid (AA) in rotating packed bed (RPB) on the molecular weight and molecular weight distribution of polyacrylic acid (PAA) were investigated. Results showed that, compared with conventional polymerization in stirred tank reactor (STR), the prepolymerization in RPB followed by polymerization in STR produced PAA with lower weight-average molecular weight (Mw) and polydispersity index (PDI). The Mw of PAA decreased with increasing rotational speed of RPB from 800 rpm to 1400 rpm. Therefore, the use of RPB might be an effective strategy to control the molecular weight and molecular weight distribution of PAA. For exploring the value of this technology in preparing PAA retanning agent, PAAs were synthesized by using STR (STR-PAA, Mw=476,615 Dal, PDI=3.36) and RPB (RPB-PAA, Mw=193,386-288,321 Dal, PDI=1.55-1.86), and their performances in retanning were evaluated. Results showed that RPB-PAAs with low Mw had high absorptivity in wet blue and achieved a good filling property for leather because they could permeate into numerous microstructures of collagen fiber network. As for RPB-PAAs, high PDI led to a satisfactory selective filling property. The fullness, mechanical property, isoelectric point, and dyeability of leather were also affected by PAAs with different Mw and PDI. This work demonstrated the considerable influences of the molecular weight and molecular weight distribution of PAA on retanning property. A method to control these parameters was also presented. Note de contenu : - EXPERIMENTAL : Materials and equipment - Preparation of PAA - Preparation of PAA retanned crust leather - Determination of molecular weight - Absorption of PAA in leather - Thickening extend of leather and selective filling property of PAA - Mechanical properties - Isoelectric point determination - Color measurements
- RESULTS AND DISCUSSION : Effect of preparation method on the molecular weight and molecular weight distribution of PAA - Retanning properties of PAAsEn ligne : https://drive.google.com/file/d/1pCUBd25dnCUd4zcj5Yzh-uPPI7ZVeYND/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33253
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