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Role of natural binders in leather finishing : A comparative approach / Janani Venkatramani in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 6 (06/2022)
[article]
Titre : Role of natural binders in leather finishing : A comparative approach Type de document : texte imprimé Auteurs : Janani Venkatramani, Auteur ; Bindia Sahu, Auteur Année de publication : 2022 Article en page(s) : p. 223-231 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Finition
Enduction
Etudes comparatives
LiantsIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leather finishing has its own importance in leather making. A variety of chemicals are used in the finishing operation, to provide the aesthetic look of the leather products. The role of finishing chemicals such as pigments, dyes, plasticizers, wax emulsions, cross linkers, fillers, wetting, penetrating agents and binders have their own role to give finished look to the leather products. A binder plays significant role in the leather finishing. This review elaborated on the role of natural binders with respect to their properties, application and binding effects in leather finishing against synthetic binders. This review focuses on a greener approach to leather finishing. Note de contenu : - Role of finishing step
- Different coats used in leather finishing
- Different types of finishing techniques used in leather finishing
- Different types of finishing chemicals consist of natural compounds
- Binders - The role of binder
- Tyes of binders used for leather finishing
- Environmental concern
- Fig. 1 : Processes involved in leather processing
- Fig. 2 : Different types of coating process in leather finishing
- Fig. 3 : Different types of finishing techniques for leather finishing
- Fig. 4 : The comparative properties of natural and synthetic binders
- Table 1 : Represent the different types of leather finishing techniques
- Table 2 : Finishing materials consisting of natural compounds
- Table 3 : List of binders for leather finishingDOI : https://doi.org/10.34314/jalca.v117i6.4963 En ligne : https://drive.google.com/file/d/1-eBX-91oLOZ_0BtHPi_BL-lZyfDo1FcE/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37797
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 6 (06/2022) . - p. 223-231[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23490 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Saccharides in leather Type de document : texte imprimé Auteurs : Karl Flowers, Auteur Année de publication : 2022 Article en page(s) : p. 44-45 Langues : Anglais (eng) Catégories : Amidon dialdéhyde
Biomatériaux
Carboxyméthylcellulose
Carraghénanes
Cuirs et peaux -- Finition
Glucides
HémicelluloseLes principaux polysaccharides non cellulosiques du bois. Le bois est constitué d'hémicellulose (28 à 35%), de cellulose et de lignine.
hydrocolloïdes
Lignocellulose
Polymères
Post-tannageIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The November/December 2020 issue of International Leather Maker (page 42) covered the new bio-based materials that are being looked at for the post-tanning and finishing. This article will examine the practical use of the chemistry in today's modern process and will try to explain why these are advantageous. To remind the reader, the materials covered in that editorial article were:
- Nano-biocomposites
- Cellulose grafts
- Regenerated cellulosics
- Lignocelluloses
- Finishing cellulosics.
Since that edition of ILM in 2020, many more polysaccharides have been examined in the use of hydrogel technology, but also a look back in time shows the experience of tanners, the textbooks, leather journals and product sheets shows that saccharides have been used as monosaccharides, disaccharides or polysaccharides for a long time. Substances used include:
- Glucose for the manufacture of chromium salts
- suppression
- Dialdehyde starch
- Disaccharides in heavy vegetable manufacture (filling and grain plasticisation).
The use of dialdehyde starch was first examined in the leather industry in the 1970s. It was used by a few tanner leathers, but then seemed to fade away as other priorities in the industry started to materialise. The industry was also not prepared for the extensive post-tanning that was needed for these leathers. The perfection of the glutaraldehyde tannage would only corne through mastery of chrome-free, post-tanning that was mainly invented in the late 1990s.
Starch structure opening through oxidative ring opening allowed the starch to react, through the Maillard reaction, with the collagen. Large, bulky dialdehyde starch did not always penetrate well and many companies dropped it when they realised that the tannage may result in a raw centre.
Oxidation of saccharides that opens the compound has been modified and tweaked numerous times since the 70s. If the density of the starch opening is high the result will be a polymer that can react with the collagen in several places as the compound can bind with amine, hydroxyl and amide groups along the way. If the leather is not retanned and fatliquored correctly, the leather will be stiff and will have an unpleasant break.Note de contenu : - Biocomposites
- Hydrogels
- Lignocelluloses
- Fig. 1 : The dialdehyde starch polymer
- Fig. 2 : Carboxymethylcellulose
- Fig. 3 : Chemical structure of carrageenan
- Fig. ' : The lignin, cellulose and hemicellulose mass in plantsEn ligne : https://drive.google.com/file/d/1XKQy8bFSD2i3kqaG2C94mfBE2hMHs9b5/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37951
in INTERNATIONAL LEATHER MAKER (ILM) > N° 54 (07-08/2022) . - p. 44-45[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23483 - Périodique Bibliothèque principale Documentaires Disponible Science for students of leather technology / R. Reed / Oxford [Royaume-Uni] : Pergamon Press (1966)
Titre : Science for students of leather technology Type de document : texte imprimé Auteurs : R. Reed, Editeur scientifique Editeur : Oxford [Royaume-Uni] : Pergamon Press Année de publication : 1966 Collection : A modern course in leather technology num. 1 Importance : IX-278 p. Présentation : ill. Format : 20 cm ISBN/ISSN/EAN : 978-1-4831-2722-4 Prix : 58 E Note générale : Index Langues : Anglais (eng) Catégories : Cuirs et peaux
Cuirs et peaux -- Finition
Cuirs et peaux -- Teinture
TannageIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : This volume is the first of a series of textbooks of leather science and technology, which in view of the parucity of books delaing with this subject, can therefore be recommended to students as reliable scientifically and as reflecting current industrial practice. This book provides a concise modern treatment of fundamentals. The method of presentation is modern since the significance of scientific knowledge in technological practice is continually stressed. Many recent advances in the cheistry of vegetable tannins, reactive dyes, chrome tanning complexes and polymer structure have been included. This book covers fundamental physical chemistry, macromolecules (including proteins and carbohydrates), lipids, skin structure, biological damage, the chemistry of chrome tanning materials, vegetable tannins, dyestuffs and pigments. It is designed to assist students at schools, colleges of technology and universities. Note de contenu : - Basic physical chemistry
- Macromolecules : proteins and carbohydrates
- Lipids (oils, fats and waxes)
- Surface physical chemistry
- Skin structure and the chemistry of collagen
- Insects and micro-organisms
- The chemistry of mineral tannage
- Vegetable tannins and syntans
- Dyestuffs and pigmentsPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40421 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24435 675 REE Monographie Bibliothèque principale Documentaires Disponible Self cleaning leathers - The effect of nano TiO2 in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 5 (09-10/2008)
[article]
Titre : Self cleaning leathers - The effect of nano TiO2 Type de document : texte imprimé Année de publication : 2008 Article en page(s) : p. 183-186 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuir auto-nettoyant
Cuirs et peaux -- Finition
Cuirs et peaux de chèvres
Dioxyde de titane
Emulsions
Essais (technologie)
Formulation (Génie chimique)
Nanoparticules
PhotocatalyseIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : This study investigated the effects of nano TiO2 in self-cleaning leathers. Nano TiO2 was applied as a top coat to white goat leathers at 25%, 50%, 75% and 100% ratios, based on the amount of lacquer emulsion.
To observe the self cleaning effect, the leather samples to which nano TiO2 had been applied and control samples were stained with mud , coffee and sebum. The stained samples were exposed to UV for 24 hours. It was determined that leather samples treated with nano TiO2 exhibited a photocatalytic effect and a self cleaning effect, which increased depending on the amount of nano TiO2.Note de contenu : - Materials
- Methods : Finishing application - Applications of stains - Self cleaning test
- Fig. 1 : Photocatalyst and chlorophyll
- Fig. 2 : Finishing formulation
- Table 1 : Finishing formulation
- Table 2 : Mud stained leathers - changes in L and b value
- Table 3 : Coffee stained leathers - changes in L and b values
- Table 4 : Sebum stained leathers - changes in L and b valuesPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35248
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 92, N° 5 (09-10/2008) . - p. 183-186[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21781 - Périodique Bibliothèque principale Documentaires Disponible Silica-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)
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Titre : Silica-embedded polyurea microspheres with rough surface for matte leather finishing Type de document : texte imprimé Auteurs : Liang Jia, Auteur ; Li Wang, Auteur ; Jing Li, Auteur ; Jun Xiang, Auteur ; Yi Chen, Auteur ; Haojun Fan, Auteur Année de publication : 2022 Article en page(s) : p. 184-194 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Finition
Microsphères
Polymères en émulsion
Polyurée
Polyuréthanes
Rugosité
SiliceLa silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux.
La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...).
Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale.Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A type of polyurea microspheres with rough surfaces and different sizes (1-12 μm), which was used for waterborne polyurethane matte leather coating, were prepared by precipitation polymerization in H 2 O/acetonitrile system, using isophorone diisocyanate as polymerized monomer, 2,4-diaminobenzenesulfonic acid sodium salt as hydrophilic monomer and nano-SiO 2 as surface roughener. The effect of the loading of isophorone diisocyanate and 2,4-diaminobenzenesulfonic acid sodium salt, the volume ratio of H 2 O/acetonitrile and the addition stage of nano-SiO 2 on the particle size and surface roughness were investigated so as to achieve the excellent matte effect of the coating. The results indicated that the adding of hydrophilic monomer can reduce the particle size of microspheres and improve its re-dispersibility in water, while the increase of the proportion of acetonitrile in the mixed solvent and the loading of polymerized monomer can enlarge the size of the polyurea microspheres. As surface roughener, with the increase of nano-SiO 2 loading, the surface roughness and the particle size of microspheres increase. When nano-SiO 2 is added at the stage of the reaction system getting turbid, the maximum surface roughness of polyurea microspheres can be achieved. Polyurea microspheres with particle size (1-2 μm) and high surface roughness have better matting effect, and the gloss of the prepared waterborne polyurethane coating can be adjusted to less than 1.6° (60°-incident Angle). Note de contenu : - EXPERIMENTAL : Materials - Preparation of polyurea microspheres with different surface roughness - Preparation of WPU matte coating - Characterization
- RESULTS AND DISCUSSION : Structural of polyurea microspheres - Influence of MPDSA-Na loading on microsphere size and its re-dispersibility - Influence of H2O/AN volume ratio on microsphere size - Influence of IPDI loading on microsphere size - Effect of nano-SiO2 loading on surface roughness of polyurea microspheres
- Influence of nano-SiO2 addition stage on surface roughness of polyurea microspheres - Influence of different polyurea microspheres on the gloss of WPU coating
- Table 1 : Dn and Dn/Dw of polyurea microspheres at different MPDSA-Na loading
- Table 2 : Dn and Dn/Dw of polyurea microspheres at differentH2O/AN
- Table 3 : Dn and Dn/Dw of polyurea microspheres at different IPDI loading
- Table 4 : Dn and Dn/Dw of polyurea microspheres at different nano-SiO2 loading
- Table 5 : The polyurea microspheres with different sizes and size distributionDOI : https://doi.org/10.34314/jalca.v117i5.4913 En ligne : https://drive.google.com/file/d/11yBWz4C1N2hxkNkOsI_QcjBpR8gbfic2/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37568
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 5 (05/2022) . - p. 184-194[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23398 - Périodique Bibliothèque principale Documentaires Disponible PermalinkPermalinkSoil resistant leathers come of age / Dietrich Tegtmeyer in LEATHER INTERNATIONAL, Vol. 210, N° 4789 (04/2009)
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PermalinkStudies on the effect of polyurethane finishing on the physico-mechanical properties of leather / Rajesh Kumar in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. N° 71 (Année 1987)
PermalinkStudies on the fabrication of hydrophobic coating incorporating bentonite clay and its effect on the physical properties of the finished leather / Renganath Rao Ramesh in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 2 (02/2023)
PermalinkStudy of cross-linking reactions on butadiene binders in aqueous finishing / Anna Bacardit in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 94, N° 6 (11-12/2010)
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PermalinkSynthesis and leather application properties of a carboxylated graphene oxide modified waterborne polyacrylate leather finishing agent / Shuangquan Lai in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 6 (06/2019)
PermalinkSynthesis, characterisation and application of novel valonia tannin based waterborne polyurethane with natural colour / Yang Liu in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 103, N° 3 (05-06/2019)
PermalinkSynthesis of highly carboxylate acrylic resins for leather impregnation / Lluis Ollé in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 1 (01/2012)
PermalinkSynthesis of novel polyurethane cationomers and their application in leather finishing / B. Chattopadhyay in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIV (Année 1989)
PermalinkSynthesis of tannic acid waterborne polyurethane in application for leather finishing / Haihang Luo in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 104, N° 3 (05-06/2020)
PermalinkPermalinkTanner - Teindre - Finir / Bayer / Leverkusen [Allemagne] : Bayer (n.d.)
PermalinkPermalinkLa tannerie - Tome II / Louis Meunier / Paris : Gauthier-Villars Editeur (1952)
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