[article]
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-tannage
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Index. 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 plants |
En ligne : |
https://drive.google.com/file/d/1XKQy8bFSD2i3kqaG2C94mfBE2hMHs9b5/view?usp=drive [...] |
Format de la ressource électronique : |
Pdf |
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]
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