Application of carboxyl-functionalized epoxy resin in the leather tanning process / Bin Lyu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 7 (07/2018)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 7 (07/2018) . - p. 225-231 Titre : Application of carboxyl-functionalized epoxy resin in the leather tanning process Type de document : texte imprimé Auteurs : Bin Lyu, Auteur ; Li Yajuan, Auteur ; Dangge Gao, Auteur ; Jianzhong Ma, Auteur ; Lv Leihong, Auteur Année de publication : 2018 Article en page(s) : p. 225-231 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuir -- Teneur en chrome hexavalent Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés physiques Détérioration enzymatique Douceur (toucher) Eaux usées -- Teneur en chrome hexavalent Epoxydes Groupement carboxyle Polymères -- Synthèse Réactions chimiques Stabilité hydrothermale Tannage Température de retrait Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Chrome tanning is widely used in the tanning process ; however, it can cause environmental pollution. Leather tanned with epoxy resin was considered as a more environmentally friendlyprocess, but it takes as long as five days for reaction, and results in poor performance of leather. The aim of the present study was to tan leather collagen with a carboxyl-functionalized epoxy resin, which was thought to be an eco-friendly tanning process and the reaction time was shortened to 12h. The reaction between carboxyl-functionalized epoxy resin and leather collagen can be divided into two stages, the reaction of epoxy group with leather collagen and the reaction of carboxyl group with leather collagen. The influences of tanning conditions (medium pH, epoxy resin amount and reaction time) on the properties of tanned leather were also discussed. In the first stage, the epoxy group was reacted with leather collagen in basic conditions. The results showed that the carboxyl-functionalized epoxy resin could better penetrate into the leather fibers when the pH value was 8.5, and the best effect of tanned leather collagen was found using reaction condition of pH 7.0. In the second stage, it was the reaction of carboxyl group to leather collagen in acid conditions, and the best effect was found under the condition of pH was 3.5. Meanwhile, it provided a better tanning effect when the carboxyl-functionalized epoxy resin amount was 6% and the reaction time was 12h. The chrome-less tanning process that carboxyl-functionalized epoxy resin combination with 3% chrome was studied. The results showed that the hydrothermal stability and strength properties of leather tanned by carboxyl-functionalized epoxy resin with 3% chrome were close, even superior, to those of the leather produced by conventional chrome tanning with 8% chrome. Note de contenu : - MATERIALS AND METHODS : - Material - Methods : Synthesis of the carboxyl-functionalized epoxy resin - Tanning methodology - Testing and characterization : Shrinkage temperature - Thickness increment ratio - Mechanical properties - Softness - Enzymatic degradation - Chrome content in leather and waste water - Calculation - RESULTS : - Tanning conditions of carboxyl-functionalized epoxy resin pH : The amount of tanning agent - Chrome-less tanning results : SEM topography of the leather - Physical properties - Mechanical properties - Softness - Enzymatic degradation - Chrome content in leather and waste water En ligne : https://drive.google.com/file/d/1zAn7Cgd6nhD2xonUrhpGkK5uE09EybTG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30830 [article]

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Effects of chain transfer agents on properties of AA/BA/AM copolymer retanning agents / Bin Lyu in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 1 (01-02/2017)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 101, N° 1 (01-02/2017) . - p. 10-15 Titre : Effects of chain transfer agents on properties of AA/BA/AM copolymer retanning agents Type de document : texte imprimé Auteurs : Bin Lyu, Auteur ; Jia Lu, Auteur ; Jianzhong Ma, Auteur ; Dangge Gao, Auteur ; Dong Ma, Auteur Année de publication : 2017 Article en page(s) : p. 10-15 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Copolymère acide acrylique acrylate de butyle acrylamide Cuirs et peaux -- Propriétés mécaniques Diffractométrie de rayons X Fourier, Spectroscopie infrarouge à transformée de Microscopie électronique à balayage Polyaddition Polymères -- Analyse Retannage Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The retanning process is one of the most important processes in leather production and which plays a vital role in the modern leather industry. In this paper, copolymers based on acrylic acid (AA), butyl acrylate (BA) and acrylamide (AM), were prepared by free radical polymerization. Chain transfer agents were added during the synthesis process to control the molecular weight of the copolymer. The copolymers with different amounts of chain transfer agent were tested for their molecular weight and other properties. The copolymers were analysed using XRD, GPC and FT-IR. Leathers were retanned with different copolymers and the mechanical properties, and SEM of retanned leather were also examined. The results showed that the increased molecular weight of the copolymers decreased the crystallinity, the functional groups of copolymers did net change significantly when the dosage of chain transfer agents increased. When the amount of chain transfer agents was increased, the copolymer had a smaller molecular weight and the retanned leather showed better elongation at break. When the copolymer molecular weight was larger, the tensile strength and tear strength of retanned leather increased. This is important to help select the appropriate molecular weight acrylic retanning agent for different styles of leather products. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Synthesis of the poly AA/BA/AM copolymer - Preparation of leather - Characterization - FT-IR analysis - Mechanical properties - RESULTS AND DISCUSSION : Characteristics of the prepared copolymer solution - Gel permeation chromatography (GPC) - FT-IR analysis of the prepared copolymers solution - XRD analysis of the prepared copolymers - Scanning electron microscope (SEM) - Mechanical properties En ligne : https://drive.google.com/file/d/1w2kH_N0PovJ81YRA4Y7GYM4W1wDFxHJQ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27983 [article]

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Synthesis of modified hydrogenated castor oil/nano-ZnO composites and its application as fatliquoring agent / Duan Limin in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 4 (07-08/2015)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 4 (07-08/2015) . - p. 183-189 Titre : Synthesis of modified hydrogenated castor oil/nano-ZnO composites and its application as fatliquoring agent Type de document : texte imprimé Auteurs : Duan Limin, Auteur ; Ma Jianzhong, Auteur ; Lu Juan, Auteur ; Bin Lyu, Auteur ; Wu Xionghu, Auteur Année de publication : 2015 Article en page(s) : p. 183-189 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Propriétés mécaniques Huile de ricin et constituants Huiles et graisses hydrogénées Microscopie électronique à balayage Nanoparticules Oxyde de zinc Résistance au jaunissement Résistance au rayonnement ultraviolet Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Modified hydrogenated castor oil/nano-ZnO composites have been successfully prepared via a facile chemical approach. In this method, ZnO nanoparticles were first modified by isopropyl tri(dioctyl pyrophosphate acyloxy) titanate (NDZ201) to obtain NDZ201 modified ZnO, and then the NDZ201 modified ZnO was introduced into hydrogenated castor oil to prepare modified hydrogenated castor oli/nano-ZnO (MHCO/ZnO) composites. The stability and anti-UV susceptibility of MHCO/ZnO composites were investigated. The results show that MHCO/ZnO composites have botter UV resistance and stability than hydrogenated castor oil. Bath MI-1C0 and ZnO have the anti-UV synergistic effect. MHCO/ZnO composites as fatliquoring agents were applied to leather. The yellowing resistance, softness, and strength properties involving tensile strength, elongation al break and tear strength of fatliquored leather were studied. The tests indicated that the leather fatliquored by MHCOIZnO composites exhibited an excellent anti-yellowing performance. ZnO nanoparticles had toughening and reinforcing effects for leather. The morphology of fractured surfaces of the selected leather samples and the distribution of Zn element were observed by SEM-EDS. SEM-EDS analysis reveals that ZnO nanoparticles exist on the leather fibres. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Synthesis of modified hydrogenated castor oil/nano-ZnO (MHCO/ZnO) composites - Application in fatliquoring - Characterization - Strength properties - RESULTS AND DISCUSSION : XRD analysis of MHCO/ZnO composites - Properties of MHCO/ZnO composites - Properties of fatliquored leathers - SEM-EDS analysis of fatliquored leather samples En ligne : https://drive.google.com/file/d/1JFs8wYjoNYNKVSd-p468Ow2vrxxxKDja/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24560 [article]

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