| Titre : |
Aqueous finishing with polyisocyanate cross-linked binders |
| Type de document : |
texte imprimé |
| Auteurs : |
Lluis Ollé, Auteur ; M. Cobos, Auteur ; O. Solé, Auteur ; Anna Bacardit, Auteur |
| Année de publication : |
2009 |
| Article en page(s) : |
p. 222-228 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Cuirs et peaux -- Finition
Liants
Polyacryliques
Polyisocyanates
Polyuréthanes
Réactions chimiques
Réticulants
Réticulation (polymérisation)
Solutions aqueuses (chimie)
|
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
Due to increasingly stringent environmental legislation the leather industry has to produce eco-friendly articles. At the same time, it needs to manufacture fashionable and high-quality articles in order to increase competitiveness. As part of this, factories have to replace solvent-based products by water-based products in their finishing formulations to reduce the level of volatile organic compounds. The addition of a cross-linker is required in most cases in order to obtain high performance aqueous finishes. The aim of the present work is to explore the cross-linking reaction between polyisocyanate and both acrylic binders and polyurethanes.
A comparision of results shows that polyisocyanate presents a very fast reticulation (cross-linking) speed at room temperature and has a pot-life of only 4 hours. In order to obtain optimum fastness values, different amounts of polyisocyanate are required, the amounts depend on the type of leather used and the physical characteristics of the binders employed. |
| Note de contenu : |
- FIGURES : 1. Reaction initiation of the isocyanate group - 2. Reaction between isocyanate and functional groups - 3. Diisocyanates most commonly used in industry - 4. Evolution of the cross-linking reaction of acrylic binders A over time. Chrome leather with chrome retanning. 25 wet rubs - 5. Comparaison between cross-linked acrylic binders on chrome leather with chrome retanning. 25 wet rubs, 7 days'storage - 6. Comparaison between cross-linked acrylic binders on vegetable leather. 25 wet rubs, 7 days'storage - 7.Comparaison between cross-linked acrylic binders on chrome leather with res-syn-veg retanning. 25 wet rubs, 7 days'storage - 8. Comparaison between cross-linked polyurethane binders on chrome leather with chrome. 25 wet rubs, 7 days'storage - 9. Comparaison between cross-linked polyurethane binders on vegetable leather. 25 wet rubs, 7 days'storage - 10.Comparaison between cross-linked polyurethane binders on chrome leather with res-syn-veg retanning. 25 wet rubs, 7 days'storage
- TABLES : 1. Coating formulations - 2. Physical characteristics of acrylic binders - 3. Physical characteristics of polyurethane binders - 4. Results of colour fastness to dry rubbing. Acrylic binders - 5. Results of colour fastness to wet rubbing. Acrylic binders - 6. Results of colour fastness to dry rubbing. Polyurethane binders - 7. Results of colour fastness to wet rubbing. Polyurethane binders - 8. Results of dry flex resistance - number of rubs x 1000 - 9. Results of wet flex resistance - number of rubs x 1000 - 10. Determination of binder acidity |
| En ligne : |
https://drive.google.com/file/d/17et4UOXjaozggPe2HNaiDqR7M_LV0Miu/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25650 |
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 6 (11-12/2009) . - p. 222-228
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