Aliphatic anionic polyurethane microemulsion leather filling-retanning agent / Bao Lihong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 91, N° 2 (03-04/2007)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 91, N° 2 (03-04/2007) . - p. 73-80 Titre : Aliphatic anionic polyurethane microemulsion leather filling-retanning agent Type de document : texte imprimé Auteurs : Bao Lihong, Auteur ; Lan Yunjun, Auteur ; Shufen Zhang, Auteur Année de publication : 2007 Article en page(s) : p. 73-80 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de tannage Caractérisation Charges (matériaux) Chimie analytique Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés organoleptiques Cuirs et peaux -- Propriétés physiques Formulation (Génie chimique) Imperméabilisation Microémulsions Poids moléculaires Polymères aliphatiques Polyuréthanes Retannage Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The retanning process plays an important role in optimizing the leather’s colour, levelness, softness, fullness, and hydrophobicity. Polymer retanning agents are important materials for this process. The present study used maleic anhydride modified castor oil (MCO), PEG1000 (polyethylene glycol) and IPDI (isophorone diisocyanate) as main materials to synthesize polyurethane microemulsions (MC-PURs) and employed them to retan chrometanned leathers. The hydroxyl functionality of MCO was investigated by chemical and 1HNMR analysis, and confirmed to be about 2.0. The chemical structures of MCO, prepolymer and MC-PUR were characterized by IR. The optimized synthesis formulation and polyurethane microemulsion MC-PUR3 for MC-PURs as retanning agent was selected by comparing the properties of retanned leathers, such as softness, fullness, grain tightness, tensile strength, extension at break, depth of shade, waterproof properties et al. Then, MC-PUR3 was characterized by means of DSC, TG/DTG and TEM techniques. SEM microgram of MC-PUR3 retanned leather shows that the fibres are well dispersed. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Preparation of maleic anhydride modified castor oil (MCO) - Preparation of microemulsions of polyurethane filling retanning agents (MC-PURs) - Determination of molecular weight - H n.m.r. spectroscopy - Purification - FT-IR spectroscopy - Differential scanning spectroscopy - Thermo-gravimetric analysis - Transmission electron microscope analysis - Measurement of final dyebath exhaustion - Physical and waterproofness properties of leathers - Organoleptic properties of the final leathers - Scanning electron microscopic analysis - RESULTS AND DISCUSSION : Determination of the average molecular weight, hydroxyl number and average hydroxyl functionality (Fn(OH)) of MCO - Determination of the average hydroxyl functionality of MCO by chemical analysis - Determination of the average hydroxyl functionality of MCO by 1HNMR - Chemical structure analysis by IR - OPTIMIZATION OF RETANNING AGENT : Effect of MCO/PEG1000 mass ratio on the properties of retanned leathers - Effect of carboxyl content of MC-PUR on the properties of retanned leathers - Effect of NCO/OH molar ratio on the properties of retanned leathers - Thermal properties of MC-PUR3 - Table 1 : Basic formulations of MC-PURs - Table 2 : Filling, retanning and wet finishing processes - Table 3 : Effect of MCO/PEG1000 mass ratio on the properties of retanned leathers - Table 4 : Effect of carboxyl content of MC-PUR on the properties of retanned leathers - Table 5 : Effect of NCO/OH molar ratio on the properties of retanned leathers En ligne : https://drive.google.com/file/d/19ti2BicD3kfHFF4Z4QLX1cSWPC0J39gs/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39037 [article]

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Effects of PAA on the different scales of leather structure / Zou Xianglong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 5 (09-10/2018)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 102, N° 5 (09-10/2018) . - p. 251-253 Titre : Effects of PAA on the different scales of leather structure Type de document : texte imprimé Auteurs : Zou Xianglong, Auteur ; Chai Yuye, Auteur ; Lan Yunjun ; Li Zhongyu Année de publication : 2018 Article en page(s) : p. 251-253 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acide polyacrylique Cuir -- Séchage Fibrilles de collagène La fibrille de collagène est une structure constituée d'un assemblage de fibres de tropocollagène (assemblage de 3 protéines de collagène alpha (alpha 1 - alpha 1 - alpha 2) en une hélice droite. Retannage Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this article, the topology of fibrils and the aggregate structure of leather fibres were characterised by TEM and SEM to reveal the effects of PAA on the different scale of the structure of leather. The results show that PAA has little influence on the collagen molecules array and collagen fibres aggregate structure in the wet state. But, during air-drying PAA observably influences the collagen fibres aggregate structure. After being PAA retanned, the air-dried leather fibres become thinner and the space between fibres increases. Note de contenu : - MATERIALS AND METHODS - RESULTS AND DISCUSSION : Effect of PAA on the array of collagen molecules - Effect of PAA on the array of collagen fibres - Fig. 1 : TEM images of collagen fibrils ; no retanning and PAA retanning - Fig. 2 : SEM images of freeze drying collagen fibres : no retanning and PAA retanning - Fig. 3 : SEM images of air drying collagen fibres : no retanning and PAA retanning En ligne : https://drive.google.com/file/d/1QZzoJ4QwM2kSxzcDjTnZOzrUmZTcUiJ1/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31110 [article]

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Effects of polyacrylic acid on the structure of collagen fibre / Zou Xianglong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 4 (07-08/2014)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 98, N° 4 (07-08/2014) . - p. 172-176 Titre : Effects of polyacrylic acid on the structure of collagen fibre Type de document : texte imprimé Auteurs : Zou Xianglong, Auteur ; Lan Yunjun, Auteur ; Zhang Qinghua, Auteur ; Li Zhongyu, Auteur ; Zhang Xiaoli, Auteur Année de publication : 2014 Article en page(s) : p. 172-176 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acide polyacrylique Analyse thermique Collagène Cuirs et peaux de moutons Diffractométrie de rayons X Microscopie électronique à balayage Microscopie électronique en transmission Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The effects of polyacrylic acid (PAA) on the hierarchical structure of sheepskin collagen fibres were investigated by using of transmission electron microscope (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and differential scanning calorimetry (DSC). It was found that although the unique axial periodic (d periodicity) structure of collagen fibrils and orderly arrangement of collagen molecule did not change obviously alter the introduction of PAA, the aggregation behaviour of collagen fibres was greatly influenced. With increasing concentration of PAA, the order of intermolecular lateral packing decreased, the shrinkage of the leather lessened [from changes in surface morphology observed by SEM] and the dry heat stability of collagen fibre declined due to a decrease in the orderly degree of collagen fibre aggregation. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis of PAA - Experimental procedure and characterization - RESULTS AND DISCUSSION : TEM - SEM - XRD - DSC En ligne : https://drive.google.com/file/d/1Kql2Xrhdh5La-mewKh0DfUdKNDtREK84/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21818 [article]

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Synthesis and application of highly branched polymers as filling-retanning agents / Chai Yuye in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 94, N° 5 (09-10/2010)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 94, N° 5 (09-10/2010) . - p. 200-204 Titre : Synthesis and application of highly branched polymers as filling-retanning agents Type de document : texte imprimé Auteurs : Chai Yuye, Auteur ; Wan Xiangxiang, Auteur ; Lan Yunjun, Auteur ; Zhang Shuffen, Auteur Année de publication : 2010 Article en page(s) : p. 200-204 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique Cuirs et peaux Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés organoleptiques Cuirs et peaux de porcs Etanchéité Polyaddition Polymères ramifiés Polyméthacrylate de méthyle Le 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. Retannage Transition vitreuse Triméthylolpropane Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Highly branched polymers (HBPs) were prepared via free-radical polymerization of methacrylic acid (MAA) with polyfunctional allyl co-monomer (mono-trimethylolpropan trimaleate, PTPTM) at various n(MAA)/n(MTPTM) ratios. HBPs were employed in retanning wet-blue pigskins and the retanned leathers were evaluated by their physical properties such as tensile strength, tear strength, extension at break and organoleptic properties including softness, fullness, smoothness and tightness. The results showed that HBPs did well in filling and retanning leather and especially in the case of n(MAA)/n(MTPTM) = 12:1 (HBP-4). HBP-4 was characterized by HNMR, SEC, DSC and TGA, the results indcated that the polymer showed polydispersity (PDI = 1.456, Mw 27,024, Mn 15 566), its TG/DTG curves showed two-stage decomposition with two weight loss temperature maxima (206.38°C and 429.57°C), the single glass transition on the DSC curve and the Tg (209.98°C) which was lower than that of poly-methacrylic acid (227.85°C) implies that HBP-4 molecules have better flexibility than PMMA and there is no phase separation in the polymer. En ligne : https://drive.google.com/file/d/1yL2dJ49t1nelQb-UDh_jiL8nNWXRQk_r/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9999 [article]

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Synthesis and mechanical properties of polyacrylic acid resin retanning agent / Zou Xianglong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 3 (05-06/2014)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 98, N° 3 (05-06/2014) . - p. 127-130 Titre : Synthesis and mechanical properties of polyacrylic acid resin retanning agent Type de document : texte imprimé Auteurs : Zou Xianglong, Auteur ; Lan Yunjun, Auteur ; Zhang Qinghua, Auteur ; Zhan Xiaoli, Auteur Année de publication : 2014 Article en page(s) : p. 127-130 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acide polyacrylique Analyse mécanique dynamique Caractérisation Humidité -- Absorption Polymères -- Synthèse Retannage Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Polyacrylic acid retanning agent (PAA), PAA-1 and PAA-2 with weight average molecular weights (Mw) of 14.4 x 103 and 23.1 x 103g/mol respectively, were prepared by water solution homopolymerization of acrylic acid monomer. The effects of molecular weight and moisture absorbency on glass transition temperature (T) and mechanical properties of PAA were investigated. The results showed that PAA-1 and PAA-2 have similar capacity for moisture absorbency, namely about 14.5% at 20°C(T=20°C) and 65% relative humidity (RH=65%). After equilibrating for 48 hours at T=20°C, RH=65%, the T of PAA-1 and PAA-2 fell from 86.17°C and 90.71°C to -11.44°C and -3.09°C respectively. Dynamic mechanical analysis (DMA) showed the storage moduli of PAA-1 and PAA-2 were significantly decreased at -26.99°C and -8.78°C respectively, the storage modulus of PAA-2 was higher than that of PAA-1 due to its higher molecular weight. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis of PAA - Experimental procedure and characterization - RESULTS AND DISCUSSION : FT-IR analysis - Moisture absorption of PAA - DMA En ligne : https://drive.google.com/file/d/1o6rYJ3cgN9-nNdNj-T2EIrXpE4U7QbBG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21533 [article]

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The relationship between the organoleptic properties of leather and the aggregate structure of collagen fibres / Ren Bianli in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 6 (11-12/2018)  

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