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A study on characteristics of lightweight split leather using foam technology / Eun-Chul Shin in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 107, N° 2 (03-04/2023)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 107, N° 2 (03-04/2023) . - p. 49-54 Titre : A study on characteristics of lightweight split leather using foam technology Type de document : texte imprimé Auteurs : Eun-Chul Shin, Auteur ; Young-Woo Kim, Auteur ; Won-Ki Lee, Auteur Année de publication : 2023 Article en page(s) : p. 49-54 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Copolymères Cuirs et peaux Fixation (chimie) Matériaux expansés Microcapsules Moussage (chimie) Pénétration (physique) Polyacryliques Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Natural leather is traditionally a high-quality material that is widely used for vehicle interior materials (e.g., automobiles, trains and airplanes) and fashion items (e.g., handbags, shoes and gloves). However, it is heavier than materials such as various fibres and synthetic leather, which makes it unsuitable for modern applications that prioritise lightness, portability and fuel efficiency. In addition, animal skins used as raw materials are structured with collagen protein, which limits the ability to ability to reduce the weight by altering the thickness and chemicals used in its preparation. In this study, we investigated the penetration, fixation, and foaming methods of thermally expandable microcapsules (TEM) in leather manufacturing procedures to reduce the weight of natural leather. Dyeing and fatliquoring were suitable processes for applying TEM to leather, and the combined use of acryl polymers enabled TEM to attach efficiently to the leather tissue. The manufacture of foamed leather under conditions of 20% TEM and 3% fixing agent resulted in an increase in the thickness by >20% and enabled the production of foamed leather with excellent physical properties. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Apparatus - Process of leather manufacturing and measuring of physical properties - Measurements - RESULTS AND DISCUSSION : TEM application experiments for each leather - TEM content-specific application experiments in dyeing/fatliquoring processes manufacturing procedure - Foaming characteristics with time - Fixing agent application experiments - Table 1 : Characteristics of chemicals - Table 2 : Expansion ratio according to leather process En ligne : https://drive.google.com/file/d/1vj_BfNFpV9Ndk1h5_K2xhj5V36BwyZy3/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39062 [article]

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A study on characteristics of low-density regenerated leather using chromium-tanned shaving waste / Eun-Chul Shin in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 107, N° 2 (03-04/2023)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 107, N° 2 (03-04/2023) . - p. 43-48 Titre : A study on characteristics of low-density regenerated leather using chromium-tanned shaving waste Type de document : texte imprimé Auteurs : Eun-Chul Shin, Auteur ; Young-Woo Kim, Auteur ; Won-Ki Lee, Auteur Année de publication : 2023 Article en page(s) : p. 43-48 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuir reconstitué Cuirs et peaux -- Déchets -- Recyclage Dérayage Matériaux expansés Microsphères Moussage (chimie) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Shaving scrap is collagen fibre, that is the leather waste occurring during thickness adjustment during the natural leather manufacturing process, and may cause problems such as environmental contamination because of the chromium (Cr) contained when it comes to reclaiming processes. Various studies applying to shaving scrap are currently being conducted in many countries across the world with an initiative by the EU. Amongst those applications, the regenerated leather is being highlighted as a substitute for natural leather. However, since the regenerated leather uses latex as a binder, it accordingly entails a high weight, which is deemed as a disadvantage due to its dense internal tissues compared to other synthetic leathers. To address such disadvantages, this study employed the thermally expandable microspheres (TEMs) to improve its density and light weight by alleviating the internal structure. This is a study on the manufacturing of foamed regenerated leather using shaving scraps. In the study, the shaving scraps were forced to foam at under 100~120°C with consideration for the heat resistance of collagen fibre after applying the thermally expandable microsphere, and then the effect was analysed. In the analysis results, the most effective foaming rate was exhibited when the shaving scraps were treated at under 110°C for 8 minutes using TEMs T110. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Manufacture of regenerated leather - Measurements - RESULTS AND DISCUSSION : Optimisation of foaming conditions - Foaming studies by microsphere content - Table 1 : Microsphere used in this study - Table 2 : SEM images of foaming conditions - Table 3 : Physical properties according to content of microsphere - Table 4 : WVP* and density according to content of microsphere En ligne : https://drive.google.com/file/d/11Uz81wHKO5x9AAvLwpedwpNOepWJST2F/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39063 [article]

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Research on two-step synthesis method of 12-hydroxystearate diethanolamide / Ziling Zhao in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 107, N° 2 (03-04/2023)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 107, N° 2 (03-04/2023) . - p. 55-59 Titre : Research on two-step synthesis method of 12-hydroxystearate diethanolamide Type de document : texte imprimé Auteurs : Ziling Zhao, Auteur ; Haojie Qin, Auteur ; Pei Mao, Auteur ; Shixing Gong, Auteur ; Xiaojun Shen, Auteur Année de publication : 2023 Article en page(s) : p. 55-59 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : 12-hydroxystearate diethanolamine Acylation Ammonolyse Caractérisation Chimie analytique Composés organiques -- Synthèse Fourier, Spectroscopie infrarouge à transformée de Produits de nourriture du cuir Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : 12-hydroxystearate diethanolamine, an intermediate for a leather fatliquoring agent, was prepared by two-step synthesis of amidation reaction and ammonolysis reaction through vacuum distillation dehydration, using 12-hydroxystearic acid and diethanolamine as raw materials. Through single factor experiments, the optimised synthesis conditions were determined as follows: the molar ratio of 12-hydroxystearic acid to diethanolamine was 1:1.03, and the temperature of the first amidation reaction was 135°C and the reaction time was 4 hours. In the second step of ammonolysis reaction, the reaction temperature was 70°C, the amount of sodium ethylate (sodium ethoxide) used as catalyst was 1.5% of the mass of 12-hydroxystearic acid, and the reaction time was 2 hours. Under the optimised conditions, the yield of the product could reach 90.9%. The structures of 12-hydroxystearate diethanolamide were characterised by FTIR spectrum. Note de contenu : - MATERIALS AND METHODS : Materials - Experimental methods - Analytical methods - RESULTS AND DISCUSSION : Acylation reaction - Ammonolysis reaction - FTIR analysis - Table 1 : Effect of first step reaction temperature on the ratio of products En ligne : https://drive.google.com/file/d/1UNNfqZm_-rhgnyO37uoBvTtJzFeyrL8P/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39064 [article]

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Synthesis of ionic liquid-based amphiphilic polymer surfactant and its application in leather fatliquoring / Hao Dongyan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 107, N° 2 (03-04/2023)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 107, N° 2 (03-04/2023) . - p. Titre : Synthesis of ionic liquid-based amphiphilic polymer surfactant and its application in leather fatliquoring Type de document : texte imprimé Auteurs : Hao Dongyan, Auteur ; Xing Zhu, Auteur ; Hao Dongyu, Auteur ; Chao Wei, Auteur ; Hu Yujie, Auteur ; Wang Xuechuan, Auteur Année de publication : 2023 Article en page(s) : p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation 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 physiques Cuirs et peaux de moutons Douceur (toucher) Emulsions Granulométrie Liquides ioniques Polymères -- Synthèse Polymères amphiphiles Surfactants -- Synthèse Wet-white (tannage) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In view of the environmental pollution caused by chrome tanning in current tanning processes, the development of chrome-free ecological leather manufacturing technology is an important direction for the development of the leather industry. However, the strong negative charge of chrome-free tanned leather leads to the reduction of binding sites of most anionic dyeing and finishing materials, resulting in colour fading and poor handle of the finished leather. Therefore, this paper mainly uses Nvinylimidazole, bromodecan and dimethylaminoethyl acrylate as raw materials to synthesise a ionic liquid-based amphiphilic polymer surfactant through free radical polymerisation and quaternisation and then, uses it in the fatliquoring process of a chrome-free non-metallic tanned green leather. The structure and morphology of the fatliquored wet-white leather were studied by SEM and the ultra depth of a field microscope, and the softness and physical and mechanical properties of the fatliquored leather were tested. The results showed that the collagen fibres were loosely distributed and the gap between the collagen fibres was larger after fatliquoring,and the softness and physical and mechanical properties of the fatliquored leather were improved. Note de contenu : - EXPERIMENTAL SECTION : Materials - Methods - Characterisation - RESULTS AND DISCUSSION : FTIR analysis - 1H-NMR analysis - Surface tension - Emulsion particle size test - Physical property testing of crust leather - SEM observations - Ultra depth of field microscope - Table 1 : Fatliquoring process for sheep wet-white leather tanned by F-90 - Table 2 : Test results of physical properties of crust leather En ligne : https://drive.google.com/file/d/1lHYlywraBbreP7FKgn902_KBzii8LmAB/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39065 [article]

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