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Characteristics of lightweight grain leather with improved foamability and properties using wet-foaming technology / Eun Chul Shin in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 107, N° 3 (05-06/2023)
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Titre : Characteristics of lightweight grain leather with improved foamability and properties using wet-foaming technology Type de document : texte imprimé Auteurs : Eun Chul Shin, Auteur ; Young-Woo Kim, Auteur ; Kim Joo-Young, Auteur ; Won-Ki Lee, Auteur Année de publication : 2023 Article en page(s) : p. 106-112 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents d'expansion (chimie)
Cuir pleine fleur
Cuirs et peaux -- Propriétés physiques
Cuirs et peaux -- Teinture
Fixateurs (chimie)
LignineLa lignine est un des principaux composants du bois, avec la cellulose, l'hémicellulose et des matières extractibles. La lignine est présente principalement dans les plantes vasculaires et dans quelques algues. Ses principales fonctions sont d'apporter de la rigidité, une imperméabilité à l'eau et une grande résistance à la décomposition. Toutes les plantes vasculaires, ligneuses et herbacées, fabriquent de la lignine. Quantitativement, la teneur en lignine est de 3 à 5 % dans les feuilles, 5 à 20 % dans les tiges herbacées, 15 à 35 % dans les tiges ligneuses. Elle est moindre pour les plantes annuelles que pour les vivaces, elle est maximum chez les arbres. La lignine est principalement localisée entre les cellules (voir parois pectocellulosiques), mais on en trouve une quantité significative à l'intérieur même de celles-ci. Bien que la lignine soit un réseau tridimensionnel hydrophobe complexe, l'unité de base se résume essentiellement à une unité de phénylpropane. La lignine est le deuxième biopolymère renouvelable le plus abondant sur la Terre, après la cellulose, et, à elles deux, elles cumulent plus de 70 % de la biomasse totale. C'est pourquoi elle fait l'objet de recherches en vue de valorisations autres que ses utilisations actuelles en bois d'œuvre et en combustible.
Voie de biosynthèse : La lignine est une molécule dont le précurseur est la phénylalanine. Cet acide aminé va subir une cascade de réactions faisant intervenir une dizaine de familles d'enzymes différentes afin de former des monolignols. Ces enzymes sont : phénylalanine ammonia-lyase (PAL), cinnamate 4-hydroxylase (C4H), 4-coumarate:CoA ligase (4CL), hydroxycinnamoyl-CoA shikimate/quinate hydroxycinnamoyl transferase (HCT), p-coumarate 3-hydroxylase (C3H), caffeoyl-CoA o-methyltransferase (CCoAOMT), cinnamoyl-CoA reductase (CCR), ferrulate 5-hydroxylase (F5H), caffeic acid O-methyltransferase (COMT) et cinnamyl alcohol deshydrogenase (CAD). Dans un certain nombre de cas, des aldéhydes peuvent également être incorporés dans le polymère.
Moussage (chimie)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Natural leather is widely used in fashion products and has excellent physical properties owing to its structurally dense organisation. However, this high density leads to a high weight, which has been noted as a disadvantage. A fundamental method for improving the weight of natural leather materials is to reduce the weight of the naturally derived high-density collagen fibre tissue by structurally changing it into a low-density tissue. A low-density natural leather manufacturing technology is being developed to do so by infiltrating and foaming thermally expandable materials into a natural leather processing process; however, the dyeing of the fabric after foaming is uneven and the fabric becomes hard. In this study, we developed a wet-foaming process to replace the existing dry-foaming process after dyeing. The wet-foaming process is performed during the natural leather processing process (before the dyeing process) to improve the fixation and dyeability of thermo-expandable microcapsules (TEMs). By applying TEMs to the retanning process along with lignin (a natural product-based fixing agent) and then proceeding with the TEM foaming in liquid it is possible to provide stable foaming with flexibility of the TEMs in the leather tissue and to minimise the loss to drain. Furthermore, in the subsequent dyeing process, the TEMs dyed in the foamed state show an improved dyeing levelness. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Apparatus - Experimental method - Measurement of properties
- RESULTS AND DISCUSSION : Wet-foaming experiments by TEMs content in the retanning process - Experiment applying lignin-based fixing agent - experiment on lignin-based agent content - Experiment on dyeability of wet-foamed grain leather
- Table 1 : Characteristics of chemicals
- Table 2 : Density and flexibility according to TEMs and lignin fixing agent content
- Table 3 : Physical properties of wet-foaming leatherEn ligne : https://drive.google.com/file/d/13CISJY1kcZnr8I9DSCADGu96o4SY5aJ2/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39581
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 107, N° 3 (05-06/2023) . - p. 106-112[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24110 - Périodique Bibliothèque principale Documentaires Disponible 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)
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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 processEn ligne : https://drive.google.com/file/d/1vj_BfNFpV9Ndk1h5_K2xhj5V36BwyZy3/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39062
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 107, N° 2 (03-04/2023) . - p. 49-54[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24024 - Périodique Bibliothèque principale Documentaires Disponible 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)
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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 microsphereEn ligne : https://drive.google.com/file/d/11Uz81wHKO5x9AAvLwpedwpNOepWJST2F/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39063
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 107, N° 2 (03-04/2023) . - p. 43-48[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24024 - Périodique Bibliothèque principale Documentaires Disponible Study on possibility of oil migration according to fatliquoring agent characteristics / Jae-Hyung Park in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 5 (09-10/2018)
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Titre : Study on possibility of oil migration according to fatliquoring agent characteristics Type de document : texte imprimé Auteurs : Jae-Hyung Park, Auteur ; Young-Woo Kim, Auteur ; Won Ju Kim, Auteur ; In-Kye Paik, Auteur ; Eun-Ji Kim, Auteur ; Hyun-Dae Cho, Auteur ; Hyung-Joon Youn, Auteur ; Han-Do Kim, Auteur ; Eun-Chul Shin, Auteur Année de publication : 2018 Article en page(s) : p. 247-250 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuir dans les automobiles
Cuirs et peaux -- Analyse
Cuirs et peaux -- Détérioration
Fourier, Spectroscopie infrarouge à transformée de
Huiles et graisses
Hydrolyse
Produits chimiques -- Migration
Produits de nourriture du cuir
Réflexion totale atténuéeIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The natural leather used for car interior materials is a traditional and high-quality material that can be applied to diverse purposes such as the steering wheel, knob, seat and internal trim. However, continuous friction and sweat from the driver causes the hydrolysis of high-molecular resins and the painted surfaces weakened under the high-temperature conditions of the car interior often lead to slipperiness and increased lustre owning to the migration of the fatliquoring agent. Thus, this study investigated the bonding between the leather and different types of fatliquoring agent, and their influence on oil migration by facilitating ageing (hydrolisis). The results revealed that the silicon- and lecithin-based fatliquoring agents had a significant influence on oil migration owning to the low bonding to the leather under the ageing condition. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials and apparatus - Process of leather manufacturing and measuring of physical properties
- RESULTS AND DISCUSSION : Fat content in leather - Oil migration after hydrolisis - Attenuated total reflection-Fourier transform infrared characterisation of oil migration
- Table 1 : Characteristics of fatliquoring agent
- Table 2 : Process for fatliquoring with chrome-tanned steer hide leather
- Table 3 : Extraction solvents of fat in leather
- Table 4 : Oil contents of leather sample treatment with fatliquoring agent according to extraction solvents
- Table 5 : The results of monitoring of the oil migration on each specimen
- Table 6 : Oil absorption film after oil migration
- Table 7 : Main component of migration oilEn ligne : https://drive.google.com/file/d/1R2nzOqKwZm8GXwa9AsqB8OCMZcyvdHUp/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31108
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 102, N° 5 (09-10/2018) . - p. 247-250[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20281 - Périodique Bibliothèque principale Documentaires Disponible