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Particle size evolution of melamin-formaldehyde tanning agent on tanning effect / Mengmeng Chen in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 5 (05/2018)
[article]
Titre : Particle size evolution of melamin-formaldehyde tanning agent on tanning effect Type de document : texte imprimé Auteurs : Mengmeng Chen, Auteur ; Yahui Wang, Auteur ; Haojun Fan, Auteur ; Yi Chen, Auteur ; Jun Yan, Auteur ; Yu Liu, Auteur Année de publication : 2018 Article en page(s) : p. 151-162 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agents de tannage
Copolymère mélamine-Formaldéhyde
Cuirs et peaux -- Propriétés mécaniques
Polycondensation
Stabilité hydrothermale
Taille des particules
Tannage organiqueIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Melamine-formaldehyde [MF] resin is a tanning agent. Its average particle size [PS] is important for penetrating the skin and thus endowing performance of its resultant leather. The synthesis parameters for MF resin such as pH, molar ratio of formaldehyde to melamine, temperature and reaction time affect its PS. We investigated in detail the growth of MF’s PS and its consequent effects on hydrothermal stability, mechanical properties and the apparent properties of leather. The data showed that a broad range of average PS was formed at the different synthesis stages of MF resin. For example, the first reaction stage of methylolation gave an average particle diameter of 250 nm with a narrow size distribution under the conditions of 45°C, 3:1 molar ratio, a pH of 8.5, and a reaction time of 3 hrs. In this case the resultant leather was poor as it had a low shrinkage temperature, lacked fullness and showed a low-valued elongation at break. During the second polycondensation stage, the PS of MF resin increased with increasing reaction temperature and the molar ratio of formaldehyde to melamine. Furthermore, PS increased more rapidly by lowering the pH of the polycondensation and extending its reaction time. Thus, the new average diameter of MF resin particles reached above 3000 nm when the polycondensation reaction was done inside the skin for 2 hours at a pH of 4.5. Consequently, the resultant leather was white and full. It had a high hydrothermal stability and mechanical strength as evidenced by its fully satisfactory elongation at break. Clearly, the cross-links were formed by multiple site interactions between MF resin with large PS and collagen fibers, which enhanced the tanning effect. Note de contenu : - EXPERIMENTAL : Materials - Reaction of melamine and formaldehyde - Tanning trial - Assessment of properties of tanned leathers
- RESULTS AND DISCUSSION : Parameters affecting the particle size of MF resin tanning agent - The effect of tanning agent's PS on properties of tanned leatherEn ligne : https://drive.google.com/file/d/1nqOi07mAnm5Xjiy0M0yrCKEJqM67qm-7/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30533
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Code-barres Cote Support Localisation Section Disponibilité 19877 - Périodique Bibliothèque principale Documentaires Disponible Phosphorus-nitrogen flame retardant waterborne polyurethane/graphene nanocomposite for leather retanning / Peikun Zhang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 5 (05/2018)
[article]
Titre : Phosphorus-nitrogen flame retardant waterborne polyurethane/graphene nanocomposite for leather retanning Type de document : texte imprimé Auteurs : Peikun Zhang, Auteur ; Pingfan Xu, Auteur ; Haojun Fan, Auteur ; Zhenyu Zhang, Auteur ; Yi Chen, Auteur Année de publication : 2018 Article en page(s) : p. 142-150 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption
Azote
Cuirs et peaux -- Propriétés mécaniques
Dispersions et suspensions
Emulsions
Emulsions -- Stabilité
Essais de résilience
Essais dynamiques
GraphèneLe graphène est un cristal bidimensionnel (monoplan) de carbone dont l'empilement constitue le graphite. Il a été isolé en 2004 par Andre Geim, du département de physique de l'université de Manchester, qui a reçu pour cette découverte le prix Nobel de physique en 2010 avec Konstantin Novoselov. Il peut être produit de deux manières : par extraction mécanique du graphite (graphène exfolié) dont la technique a été mise au point en 2004, ou par chauffage d'un cristal de carbure de silicium, qui permet la libération des atomes de silicium (graphène epitaxié). Record en conduction thermique jusqu'à 5300 W.m-1.K-1. C'est aussi un matériaux conducteur.
IgnifugeantsComposé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface.
Matériaux hybrides
Phosphore
Polyuréthanes
Retannage
Stabilité hydrothermale
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : We demonstrate a facile and green approach to prepare phosphorus-nitrogen containing waterborne polyurethane/graphene nanocomposite (PN/G-WPU) as flame-retardant retanning agent for leather. The PN/G-WPU was synthesized by covalently embedding phosphoramidate-based diol into polyurethane chain, followed by emulsification with graphene oxide (GO) aqueous solution and in-situ reduced with hydrazine hydrate. The structure and emulsion stability of prepared PN/G-WPU were characterized, and the physical mechanical properties as well as the flammability of resulting leathers were investigated. The results indicate the good dispersion and strong interfacial interaction of graphene with polyurethane matrix, which facilitates the PN/G-WPU penetrating into leather fibers. The PN/G-WPU retanning agent can effectively improve the comprehensive performance of resultant leather such as hydrothermal stability, physical-mechanical properties, flame retardancy and smoke suppression performance. Accordingly, our method might provide an alternative strategy for manufacturing high-performance leather. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of PN/G-WPU dispersion - Retanning process - Characterization and performance tests FTIR analysis - Emulsion stability - XRD analysis - Hydrothermal stability - Flammability tests - SEM observation - Mechanical properties
- RESULTS AND DISCUSSION : Characterization of retanning agents - Absorption of wet blue to retanning agents - Flammability of leather - Char morphology analysis - Physical properties and hydrothermal stability of thermalEn ligne : https://drive.google.com/file/d/1C4gkIYMVr82QidS8ZXReKMNsw-beQyvG/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30532
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 5 (05/2018) . - p. 142-150[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19877 - Périodique Bibliothèque principale Documentaires Disponible A polyurethane-based retanning agent with fluorescent effect / Saiqi Tian in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 4 (04/2016)
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Titre : A polyurethane-based retanning agent with fluorescent effect Type de document : texte imprimé Auteurs : Saiqi Tian, Auteur ; Peikun Zhang, Auteur ; Haojun Fan, Auteur ; Yi Chen, Auteur ; Jun Yan, Auteur ; Bi Shi, Auteur Année de publication : 2016 Article en page(s) : p. 148-154 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agents de tannage
Fluorescence
Polymères en émulsion
Polyuréthanes
RetannageIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A novel fluorescent waterborne polyurethane retanning agent (FWPRA) was prepared through chemically incorporation of fluorescer, disodium 4,4’-bis[4-anilino-6-hydroxyethylamino-6-(2-choloronilino-1,3,5-triazin-2-yl)amino]stilbene-2,2’-disulphonate (RSW), into polyurethane backbone as a chain extender. The chemical structure was characterized by FTIR, 1H NMR and UV?vis spectrophotometer, and fluorescence performances of FWPRA, RSW together with resultant leather were investigated systematically. The results indicate that polymerization has a positive effect on optical performance; FWPRA shows enhanced fluorescence intensity in comparison with fluorescer RSW. In the retanning process, no decay of optical performance can be found when chromium(III) salt and chestnut extract are used together, which reveals that FWPRA presents good fluorescence stability to other chemicals. For wet blue retanned by FWPRA, the shrinkage temperature, thickness as well as mechanical properties are improved. Most importantly, the resultant leather exhibits magic fluorescence effect under UV lamp. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of FWPRA - Measurements
- RESULTS AND DISCUSSION : Chemical structure - Fluorescent properties - Stability of fluorescence - Application of FWPRA in retanning processEn ligne : https://drive.google.com/file/d/1b8U8vIsnegH8LkAgZvugqssXGQ24hX6K/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25994
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Code-barres Cote Support Localisation Section Disponibilité 17930 - Périodique Bibliothèque principale Documentaires Disponible Preparation and characteristics of graphene-based polymeric leather fatliquor / Zhenyu Zhang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 9 (09/2020)
[article]
Titre : Preparation and characteristics of graphene-based polymeric leather fatliquor Type de document : texte imprimé Auteurs : Zhenyu Zhang, Auteur ; Mengjie Cui, Auteur ; Zhonghui Wang, Auteur ; Haojun Fan, Auteur ; Yi Chen, Auteur ; Jun Xiang, Auteur ; Jun Yan, Auteur ; Jixin Ning, Auteur Année de publication : 2020 Article en page(s) : p. 337-346 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens
Blindage (électricité)
Caractérisation
Essais (technologie)
Essais de comportement au feu
Oxyde de graphène
Produits de nourriture du cuir
Résistance au rayonnement ultravioletIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Although the research of leather chemicals has experienced considerable advances, it remains imperative and challenging to develop functional ones ; especially functionalized fatliquors or retanning agents. In consideration with the unique structure and properties, graphene oxide (GO) has been reported as a potential alternative to ameliorate the performance of leather. However, one of the intractable handicaps is how to make graphene penetrate evenly and react with collagen fibers. Here, we demonstrate a method for preparing graphene-based polymeric fatliquor (PFGO) via an amidation reaction between amino-groups of aminated graphene (AGO) and anhydride bonds of maleic anhydride-rapeseed ouf copolymer (MRO), which was synthesized by free radical copolymerization. The results show that the as-prepared fatliquor has good emulsion stability and can penetrate into the collagen fibers uniformly. Compared with the control sample without graphene, the antibacterial, electromagnetic shielding, flame retardant and UV resistance characteristics of the PFGO-treated leather were significantly improved. Overall, this effective yet promising paradigm may provide an achievable solution toward developing graphene-based polymer composites simultaneously with high physical property and high functional performance. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of GO based faltiquor (PFGO) - Fatliquoring process
- CHARACTERIZATION AND PERFORMANCE TESTS : Instrument testing - Stability of fatliquor solution - SEM observation of leather - Antibacterial testing of fatliquor - Electromagnetic radiation shielding. Performance testing of leather - Flammability testing of leather - UV-resistance property testing of leather - Thermal stability testing of leather - Mechanical measurements
- RESULTS AND DISCUSSION : Characterization of AGO - Characterization of fatliquor - Distribution of fatliquor in leather - Antibacterial property of fatliquor - Electromagnetic shielding performance of leather - Flammability of leather - UV-resistance of fatliquored leatherDOI : https://doi.org/10.34314/jalca.v115i9.3849 En ligne : https://drive.google.com/file/d/1v5ccCkackiJzJmgK2tdNNEZKqF3muZUK/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34587
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Code-barres Cote Support Localisation Section Disponibilité 22340 - Périodique Bibliothèque principale Documentaires Disponible 22341 - Périodique Bibliothèque principale Documentaires Disponible Preparation and properties of thermally expandable microspheres for foam coating / Guodong Huang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 7 (07/2021)
[article]
Titre : Preparation and properties of thermally expandable microspheres for foam coating Type de document : texte imprimé Auteurs : Guodong Huang, Auteur ; Zhixian Lin, Auteur ; Haojun Fan, Auteur ; Jun Xiang, Auteur ; Chong Zheng, Auteur ; Zhiqing Luo, Auteur Année de publication : 2021 Article en page(s) : p. 249-259 Note générale : Bibliogr. Langues : Américain (ame) Catégories : 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 -- Finition
Fleur du cuir
Formulation (Génie chimique)
Microsphères
Moussants
Mousses plastiques
Polyacétate de vinyle
Polyacrylonitrile
Polymères expansés
Polyméthacrylate de méthyleLe poly(méthacrylate de méthyle) (souvent abrégé en PMMA, de l'anglais Poly(methyl methacrylate)) est un polymère thermoplastique transparent obtenu par polyaddition dont le monomère est le méthacrylate de méthyle (MMA). Ce polymère est plus connu sous son premier nom commercial de Plexiglas (nom déposé), même si le leader global du PMMA est Altuglas International9 du groupe Arkema, sous le nom commercial Altuglas. Il est également vendu sous les noms commerciaux Lucite, Crystalite, Perspex ou Nudec.
Résistance chimique
Réticulation (polymérisation)
Revêtements organiquesIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : A type of thermally expandable microspheres (TEMs) for foam coating was prepared by suspension polymerization with acrylonitrile (AN), methyl methacrylate (MMA), vinyl acetate (VAC) as shell polymer monomers and i-pentane as core foaming agent. The effects of an aqueous additive (Sodium Chloride, NaCl) on the size and distribution of TEMs, and the effects of crosslinking degree, i-pentane dosage and monomer mass ratio on the expansion property, expansion temperature and solvent-resistance of TEMs were investigated. The results showed that when the dosage of NaCl was close to the saturation solubility (30%), the dosage of crosslinking agent and alkane were about 0.09% and 7.4%, and the mass ratio of AN/MMA/VAC w rm distribution and good solvent resistance, the expansion diameter ratio was 5 times under 110~120 C, which meets the application requirements for foam coating of leather or synthetic leather. Note de contenu : - MATERIALS AND METHODS : Experimental materials - Preparation of TEMs - Preparation of foaming coating - Finishing of split leather and damaged grain leather
- CHARACTERISTICS OF TEMS : Determination of particle size and distribution - Observation on surface morphology - Determination of expansion property and temperature
- RESULTS AND DISCUSSION : Structure design of TEMs - Effect of NaCl concentration on the size and distribution of TEMs - Effect of crosslinking degree on the expansion property and temperature of TEMs - Effect of dosage of alkane on expansion property and temperature of TEMs - Effect of monomer mass ratio on expansion property, temperature and solvent resistance of TEMs - Morphology of split leather foam coating - Matting and mending effect of foaming coating
- Table 1 : The basic formula for preparing TEMs
- Table 2 : Foaming properties and foaming temperature of TEMS with different content of EGDMA
- Table 3 : Effect of foaming agent dosage on the expansion property and foaming temperature of thermally expanded microspheres
- Table 4 : Effect of monomer ratio on the expansion property and expansion temperature of thermally expanded microspheresDOI : https://doi.org/10.34314/jalca.v116i7.4336 En ligne : https://drive.google.com/file/d/1i1pJAJAQnAwYRmogNbezp7Ho-pyNhhl1/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36082
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Code-barres Cote Support Localisation Section Disponibilité 22869 - Périodique Bibliothèque principale Documentaires Disponible Preparation, mechanical and thermal properties of polydimethylsiloxane coating for synthetic leathers / Zhe Sun in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 6 (11/2022)
PermalinkSilica-embedded polyurea microspheres with rough surface for matte leather finishing / Liang Jia in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 5 (05/2022)
PermalinkSustainable and invisible anti-counterfeiting inks based on waterborne polyurethane and upconversion nanoparticles for leather products / Jun Xiang in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)
PermalinkTanning characteristics and tanning mechanism of nano-SiO2 / Haojun Fan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 4 (07-08/2004)
PermalinkThe biodegradabilities of rape oil-based fatliquors prepared from different methods / Zhaoyang Luo in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 4 (04/2010)
PermalinkThe water vapour permeability of leather finished by thermally responsive polyurethane / Haojun Fan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 89, N° 3 (05-06/2005)
PermalinkThermally responsive collagen switching from bactericidal for ambient storage condition to biologically inert in vivo / Jinming Chang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 4 (04/2018)
PermalinkWaterborne dimethylolpropionic acid-diisocyanate adducts with alkali-deblockable isocyanate groups as pretanning agent for chrome tanning / Jie Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 2 (02/2015)
PermalinkWaterborne polyurethane/O-MMT nanocomposites for flame retardant leather finishing / Zhang Xiuli in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 94, N° 2 (03-04/2010)
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