| Titre : |
Application of carboxyl-functionalized epoxy resin in the leather tanning process |
| Type de document : |
texte imprimé |
| Auteurs : |
Bin Lyu, Auteur ; Li Yajuan, Auteur ; Dangge Gao, Auteur ; Jianzhong Ma, Auteur ; Lv Leihong, Auteur |
| Année de publication : |
2018 |
| Article en page(s) : |
p. 225-231 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Cuir -- Teneur en chrome hexavalent
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux -- Propriétés physiques
Détérioration enzymatique
Douceur (toucher)
Eaux usées -- Teneur en chrome hexavalent
Epoxydes
Groupement carboxyle
Polymères -- Synthèse
Réactions chimiques
Stabilité hydrothermale
Tannage
Température de retrait
|
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
Chrome tanning is widely used in the tanning process ; however, it can cause environmental pollution. Leather tanned with epoxy resin was considered as a more environmentally friendlyprocess, but it takes as long as five days for reaction, and results in poor performance of leather. The aim of the present study was to tan leather collagen with a carboxyl-functionalized epoxy resin, which was thought to be an eco-friendly tanning process and the reaction time was shortened to 12h. The reaction between carboxyl-functionalized epoxy resin and leather collagen can be divided into two stages, the reaction of epoxy group with leather collagen and the reaction of carboxyl group with leather collagen. The influences of tanning conditions (medium pH, epoxy resin amount and reaction time) on the properties of tanned leather were also discussed. In the first stage, the epoxy group was reacted with leather collagen in basic conditions. The results showed that the carboxyl-functionalized epoxy resin could better penetrate into the leather fibers when the pH value was 8.5, and the best effect of tanned leather collagen was found using reaction condition of pH 7.0. In the second stage, it was the reaction of carboxyl group to leather collagen in acid conditions, and the best effect was found under the condition of pH was 3.5. Meanwhile, it provided a better tanning effect when the carboxyl-functionalized epoxy resin amount was 6% and the reaction time was 12h. The chrome-less tanning process that carboxyl-functionalized epoxy resin combination with 3% chrome was studied. The results showed that the hydrothermal stability and strength properties of leather tanned by carboxyl-functionalized epoxy resin with 3% chrome were close, even superior, to those of the leather produced by conventional chrome tanning with 8% chrome. |
| Note de contenu : |
- MATERIALS AND METHODS :
- Material
- Methods : Synthesis of the carboxyl-functionalized epoxy resin - Tanning methodology
- Testing and characterization : Shrinkage temperature - Thickness increment ratio - Mechanical properties - Softness - Enzymatic degradation - Chrome content in leather and waste water - Calculation
- RESULTS :
- Tanning conditions of carboxyl-functionalized epoxy resin pH : The amount of tanning agent
- Chrome-less tanning results : SEM topography of the leather - Physical properties - Mechanical properties - Softness - Enzymatic degradation - Chrome content in leather and waste water |
| En ligne : |
https://drive.google.com/file/d/1zAn7Cgd6nhD2xonUrhpGkK5uE09EybTG/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30830 |
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 7 (07/2018) . - p. 225-231
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Application of carboxyl-functionalized epoxy resin in the leather tanning process in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 7 (07/2018)
