| Titre : |
Auxiliary agents with non-swelling capacity used in pickling-tanning processes. Part 2 |
| Type de document : |
texte imprimé |
| Auteurs : |
Ramón Palop, Auteur ; Agusti Marsal, Auteur |
| Année de publication : |
2002 |
| Article en page(s) : |
p. 203-211 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Agents anti-gonflement
Cuirs et peaux
PicklageLe picklage consiste à faire absorber à la peau en tripe une quantité importante d'acide, en présence de sel neutre (NaCl) pour réprimer le gonflement que provoquerait l'acidité du milieu.
Sulfoniques, Acides
Tannage
|
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
The use of different types of aromatic sulphonic acids, known as "non-swelling acids" has been suggested by many authors in order to avoid swelling when the pickling operation is completed with sulphuric and/or formic acid. G.Otto studied the influence of 16 aromatic sulphonic acids and their salts on the swelling of hides during the pickling process. He found that the acid swelling of the leather diminishes in sulphonic acids containing only one ring and an increased dipolar activity. Sulphonic acids with two rings and a high dipolar activity repress swelling in an even more remarkable way.
In a previous paper, we studied the capacity of four commercial products to prevent acid swelling: polyacrylic acid ; naphthol 3-6-disulphonic acid; p-hydroxydiphenyl sulphonic acid and a blend of naphthalene and naphthol sulphonic acids (chemical A). On the basis of the results obtained, we concluded that an offer of 3% (on pelt weight) of the four products studied reduced swelling after pickling at salinity values of 0 ̊, 1 ̊ and 2 ̊ Bé. However, after tanning and dyeing, Chemical A provided the best results since, at a salinity of 2 ̊Bé, it prevented swelling sufficiently, gave rise to a good shrinkage temperature and did not reduce the colour too much when compared with the standard pickling process(L* = 50 against 42).
In this part of the work, the application conditions for chemical A which were determined in the previous paper with hide pieces are here optimised for whole hides. First of all, a pickling process with chemical A is compared to a standard pickling process. Subsequently, the tanning process of hides treated with Chemical A and subsequently pickled is more deeply studied. |
| Note de contenu : |
- EXPERIMENTAL PROCEDURE : Optimisation of application conditions of chemical A
- RESULTS : Standard pickling process vs a pickling process with chemical A - Improvement of the tanning process - Variations in the process with chemical A and chemical C - Comparative study between the process with chemicals A and C and the standard (Reference) process
- Table 1 : Process using a blend of naphthalene and naphthol sulphonic acids (chemical A) compared with a standard process
- Table 2 : Process using chemical A and a strongly masked chromium salt (chemical C)
- Table 3 : Process using chemicals A and C compared with a standard process
- Table 4 : Evaluation of the residual bath and the wet-blue leather obtained with the standard process and the process with chemical A
- Table 5 : Evaluation of the organoleptic and mechanical properties of leathers obtained with the standard process and the process with chemical A
- Table 6 : Evaluation of the residual bath and the wet-blue leather obtained with the standard process and the process using chemicals A and C
- Table 7 : Evaluation of the organoleptic and mechanical properties of leathers obtained with the standard process and the process with chemical A and C |
| En ligne : |
https://drive.google.com/file/d/1efWw-7m3HRsXP5cXmGwNrwsK7EWQmS_C/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39860 |
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 86, N° 5 (09-10/2002) . - p. 203-211
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Auxiliary agents with non-swelling capacity used in pickling-tanning processes. Part 2 in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 86, N° 5 (09-10/2002)
