| Titre : |
Auxiliary agents with non-swelling capacity used in pickling-tanning processes - Part 4 |
| Type de document : |
texte imprimé |
| Auteurs : |
Agusti Marsal, Auteur ; Ramón Palop, Auteur ; V. Frias, Auteur ; M. D. de Castellar, Auteur ; Pedro J. Celma, Auteur ; Albert M. Manich, Auteur |
| Année de publication : |
2004 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Agents anti-gonflement
Cuirs et peaux -- Analyse
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux de moutons
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.
Post-tannage
Résistance à la déchirure
Résistance à la traction
Tannage au chrome
|
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
The reduction in the use of salt in pickling due to the application of different chemicals with non-swelling capacity - polyacrylic acid, naphthol 3-6-disulphonic acid, p-hydroxydiphenyl sulphonic acid and a blend of naphthalene and naphthol sulphonic acids- has been studied in previous papers.1-3 These chemicals were applied in the pickling process either alone or with small amount of salt.
In Part I1, it was confirmed that the blend of naphthalene and naphthol sulphonic acids at an offer of 3% (on pelt weight) and at a salinity of 2°Bé could be a valid alternative since it adequately prevented the swelling of hides. Tanning treatments with conventional chromium salts yielded the correct shrinkage temperatures.
In Part II2 it was observed that the conventional tanning process of hides pickled with sulphuric acid and 3% (on pelt weight) of the blend of naphthalene and naphthol sulphonic acids at a salinity of 2°Bé yielded leathers that could be acceptable as far as physical properties and handle were concerned. However; these leathers showed an irregular stratigraphic distribution of Cr2O3 and a marked colour difference between grain and flesh sides.
Optimization of the tanning process of these hides confirmed that the best results were obtained with a strongly masked chromium salt with a very low basicity.
In Part III3, the possible application of chemicals with non-swelling capacity to reduce the use of salt in the pickling process of sheepskins was studied. In this case, the use of a strongly masked chromium salt with a very low basicity in the tanning process was not necessary since conventional tanning salts were adequate. The best results in terms of non-swelling capacity, shrinkage temperature of the tanned hides, conductivity and Chemical Oxygen Demand of the residual baths were achieved under the following conditions: 2% p-hydroxydiphenyl sulphonic acid (salinity 2°Bé); 2% naphthol 3-6-disulphonic acid (salinity 2°Bé) and 4% polyacrylic acid (salinity 2°Bé). |
| Note de contenu : |
- AIM OF THE WORK
- EXPERIMENTAL PROCEDURE : Pickle and tannage - Process evaluation
- RESULTS : Swelling of the pickled/tanned skins - Evaluation of the pickling and tanning residual baths - Leather characteristics
- APPENDIX : Chemicals utilized in this work
- Table 1 : Comparative study between pickling processes
- Table 2 : Post-tanning processes
- Table 3 : Thickness variation (%) after pickling/tanning in relation to bating
- Table 4 : Evaluation of the pickling and tanning residual baths
- Table 5 : Leather characteristics as a function of the pickling process
- Table 6 : Tensile strength (IUP 6)
- Table 7 : Tear Resistance (IUP 8)
- Table 8 : Measurement of distension and strength of the grain by the Ball Burst Test (IUP 9) |
| En ligne : |
https://drive.google.com/file/d/1KGJNb1N6N3BJ-enzwHjtuzRzbeI92kqw/view?usp=shari [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39617 |
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 88, N° 6 (11-12/2004)
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Auxiliary agents with non-swelling capacity used in pickling-tanning processes - Part 4 in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 6 (11-12/2004)
