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JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) . Vol. CXIV, N° 10Mention de date : 10/2019Paru le : 11/10/2019 |
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Ajouter le résultat dans votre panierThe effect of incorporating hydroxyapatite and silica nanoparticles in polyethylene surface treatment of natural leather / E. Jowshan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 10 (10/2019)
[article]
inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIV, N° 10 (10/2019) . - p. 361-372
Titre : The effect of incorporating hydroxyapatite and silica nanoparticles in polyethylene surface treatment of natural leather Type de document : texte imprimé Auteurs : E. Jowshan, Auteur ; Amir Ershad-Langroudi, Auteur Année de publication : 2019 Article en page(s) : p. 361-372 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux -- Propriétés optiques
Cuirs et peaux -- Propriétés thermiques
HydroxyapatiteL'hydroxyapatite est une espèce minérale de la famille des phosphates, de formule Ca5(PO4)3(OH), usuellement écrite Ca10(PO4)6(OH)2 pour souligner le fait que la maille de la structure cristalline comprend deux molécules. L'hydroxyapatite est le membre hydroxylé du groupe apatite. L'ion OH- peut être remplacé par le fluor, le chlore ou le carbonate.
L'hydroxyapatite cristallise dans le système hexagonal. La poudre d'hydroxyapatite pure est blanche. Celles que l'on trouve dans la nature peuvent cependant être de couleur marron, jaune ou verte.
Mesures optiques
Nanoparticules
Polyéthylène glycol
Résistance au vieillissement
SiliceLa silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux.
La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...).
Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale.
Traîtements de surfaceIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leather is a natural material which is used widely in different industries. It is prone to lose moisture due to environmental conditions. Consequently, leather becomes hard and fragile, which leads to poor durability. A novel mixed system of Poly (ethylene glycol), Hydroxyapatite, plus Silica nanoparticles enhanced the mechanical, thermal, optical, and aging properties of the natural leather properties. This system also enabled the retention of moisture in leather. Thanks to the reinforcing properties of hydroxyapatite/silica nanoparticles, and the lubricating effect of poly (ethylene glycol), these modifying agents enhanced the mechanical and thermal properties of leather and preserved the leather’s natural color and gloss. Note de contenu : - EXPERIMENTAL : Materials - Modification of the leather - Characterization
- RESULTS AND DISCUSSION : Optical test results - The acidity of modified leather specimens - The dynamical-mechanical behavior of the leather specimens - Morphology investigation using SEM - The oxygen of the specimensEn ligne : https://drive.google.com/file/d/1hl1hKNCf9NFtxRak5GP6wr61Jfv0ry2g/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33032 [article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21208 - 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)
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inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIV, N° 10 (10/2019) . - p. 373-381
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 [article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21208 - Périodique Bibliothèque principale Documentaires Disponible Determination of free formaldehyde in leather chemicals / Yudan Yi in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 10 (10/2019)
[article]
inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIV, N° 10 (10/2019) . - p. 382-390
Titre : Determination of free formaldehyde in leather chemicals Type de document : texte imprimé Auteurs : Yudan Yi, Auteur ; Wei Ding, Auteur ; Ya-Nan Wang, Auteur ; Bi Shi, Auteur Année de publication : 2019 Article en page(s) : p. 382-390 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agents de tannage
Chimie analytique
Cuir -- Teneur en formaldéhyde
Polyamines
Produits chimiques -- Teneur en formaldéhyde
RetannageIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Formaldehyde is widely used in the synthesis of various leather chemicals due to its high reactivity and low cost. It is probably introduced into leather when applying the chemicals to processing, and then released during storage and use of leather, which may pose a potential risk to human health. Existing method for determining formaldehyde in leather is helpless to deal with the complicated chemicals. In this study, a method was optimized for determination of free formaldehyde in leather chemicals based on ISO 27587. A 0.5-2.0 g sample of leather chemical (formaldehyde could range from 1.25 to 1250 mg/kg) was heated at 90°C in nitrogen atmosphere. The released formaldehyde was purged at a flow rate of 300 mL/min for 30 min, captured and derivatized using a bubble absorption tube containing 2,4-dinitrophenylhydrazine absorption solution, and then detected by HPLC-diode array detector. The recovery rate of formaldehyde standard solution was 91.0% with relative standard deviation (RSD) of 4.87% in seven times repeated trials. The repeated determinations of aldehyde tanning agents showed the formaldehyde recoveries higher than 90% and RSD lower than 7%, indicating the accuracy and precision of the method. Powdery amino resins were determined to contain a tiny amount of free formaldehyde using this method. However, it should be noted that hydrolyzed formaldehyde will be formed when the amino resins were dissolved in water and used in retanning, leading to the potential for bringing leather with high content of formaldehyde. Note de contenu : - EXPERIMENTAL : Materials - Determination of formaldehyde in leather chemicals - Effects of extraction conditions on the determination of formaldehyde - Effect of derivative devices on the determination of formaldehyde - Determination of formaldehyde in amino resin and leather
- RESULTS AND DISCUSSION : Effect of extraction conditions on the determination of formaldehyde - Validation parameters of the proposed method - Effect of derivative devices on the determination of formaldehyde - Determination of formaldehyde content in amino resins and retanned leatherEn ligne : https://drive.google.com/file/d/1ovkzKqph88a5PaXbxWN0an2EWrZffTZZ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33034 [article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21208 - Périodique Bibliothèque principale Documentaires Disponible Effect of ionic liquids pretreatment on the extraction of collagen from calf skin / Sicong Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 10 (10/2019)
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inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIV, N° 10 (10/2019) . - p. 391-399
Titre : Effect of ionic liquids pretreatment on the extraction of collagen from calf skin Type de document : texte imprimé Auteurs : Sicong Liu, Auteur ; Wentao Liu, Auteur ; Li Guoying, Auteur Année de publication : 2019 Article en page(s) : p. 391-399 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chimie analytique
Collagène
Cuirs et peaux de veaux
Extraction (chimie)
Liquides ioniquesIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The use of ionic liquids (ILs) for collagen extraction should be premised of not destroying the triple helix structure of collagen. Herein, the effects of pretreatments by two imidazolium based ILs with different anions, 1-ethyl-methylimidazolium dicyanamide ([EMIM][N(CN)2]) and 1-ethyl-methylimidazolium tetrafluoroborate ([EMIM][BF4]), on the extraction of collagen from calf skins were studied. The dependences of ILs pretreatments on ILs species and concentrations (30%, 50%, and 70% (w/w)) were examined, in terms of the fiber morphology of skins as well as the extraction rate, structural integrity, thermal stability, and aggregation behaviors of collagens. The results of histological analysis and scanning electron microscopy showed that the skin fibers were effectively loosened by the IL s pretreatments. The extraction rate of collagen was improved as the increase of ILs concentration and polarity with the highest value of 28.79%. Moreover, sodium dodecyl sulphatepolyacrylamide gel electrophoresis and Fourier transform infrared spectroscopy confirmed that the structural integrity of collagen was maintained after ILs pretreatments, although the thermal stability of collagen was determined to be slightly decreased by ultra-sensitive differential scanning calorimeter. Finally, pyrene fluorescence analysis and atomic force microscope indicated that the aggregation behavior of collagen was weakened when increasing the ILs concentration and polarity. The green ILs pretreatment of calf skins might be used as an effective approach for the extraction of bioactive collagen with improved yield and purity. Note de contenu : - EXPERIMENTAL : Materials - Ionic liquids pretreatment on NS - Histological analysis - SEM - Extraction of collagen - Extraction rate of collagen - SDS-PAGE - FTIR - Thermal analysis - Fluorescence measurements - AFM
- RESULTS AND DISCUSSION : Effect of ILs on calf skin - Extraction rate anaysis - Structural integrity of collagen - Thermal stability of collagen - Aggregation behavior of collagenEn ligne : https://drive.google.com/file/d/1IYTryFmWwzS6xJRTho0fxBzDFkzmgrxa/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33035 [article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21208 - Périodique Bibliothèque principale Documentaires Disponible
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