[article]
| Titre : |
The effect of different acids in the warm circulator system sole leather tannage |
| Type de document : |
texte imprimé |
| Auteurs : |
D. A. Williams-Wynn, Auteur |
| Année de publication : |
1970 |
| Article en page(s) : |
p. 348-355 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Chimie analytique
Cuirs et peaux
Formique, Acide
Lactique, AcideL'acide lactique est un acide organique qui joue un rôle dans divers processus biochimiques. Un lactate est un sel de cet acide. Contrairement à ce que peut laisser penser son nom, l'acide lactique n'est pas présent uniquement dans le lait, mais également dans le vin, certains fruits et légumes, et dans les muscles.
L'acide lactique est un acide alpha hydroxylé, sa formule chimique est C3H6O3 et sa structure se reflète dans son nom systématique, l'acide 2-hydroxypropanoïque.
Liqueurs de tannage
Semelles
Sulfurique, Acide
Tannage
|
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
An investigation has been made of the use of formic acid, or lactic acid, or binary blends of these with each other, or with sulphuric acid, in place of sulphuric acid used alone for acidifying the warm circulator vegetable tan liquors. In each case the pelt had been pretreated in a standing pickle consisting of Calgon and sulphuric acid.
Small differences due to the organic acids were noted, in particular increased water absorption but improved resistance to water penetration, when formic acid was used. However, there seemed to be no advantages in the use of lactic acid. Blends of acid tended to give results intermediate in effect between the use of the individual acids.
In any event the effects noted were generally very small, and this may be the result of the relatively small amount of acid used for acidifying the tan liquors, since the pickle is the major source of acid in this tanning system. |
| Note de contenu : |
- PHYSICAL PROPERTIES : Density, g/cc - Compressibility - Grain crack index - Water absorption Q24, % - Water absorption Kubelka, % - Dynamic water penetration minutes - Water penetration after redrying, minutes - Thickness, mm - Abrasion rate, mm/1000 throws - Shrinkage temperature, °C
- CHEMICAL ANALYSES : Petrol ether extract, % - Water soluble matter, % - Hide substance, % - Fixed tans, % - Degree of tannage |
| En ligne : |
https://drive.google.com/file/d/1F5iYFpESaQKm4D9BYwBmzqhHVFY1vL8W/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37020 |
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 54, N° 10 (10/1970) . - p. 348-355
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