| Titre : |
"Formaldehyde-free leather" - a realistic objective ? |
| Type de document : |
texte imprimé |
| Auteurs : |
Renate Meyndt, Auteur ; Heinz-Peter Germann, Auteur |
| Année de publication : |
2005 |
| Article en page(s) : |
p. 23-27 |
| Langues : |
Anglais (eng) |
| Catégories : |
Cuir -- Teneur en formaldéhyde
Cuirs et peaux -- Analyse
Formaldéhyde
Produits chimiques -- Consommation -- Réduction
Vieillissement
|
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
There is an increasing demand for "formaldehyde-free" leather. No legal regulation presently exists for this chemical in the EU, but in many areas of application the amount of formaldehyde contained in leather is limited by technical specifications or eco-labels.
Formaldehyde is used in large quantities as a starting material for the production of synthetic aromatic and resin-tanning agents. During the production of these compounds formaldehyde acts as a condensation agent, helping to develop larger molecules. The resulting condensation products have different levels of hydrolytic stability, so are potential sources of formaldehyde. In addition, some dyeing auxiliaries, fatliquors and finishing products are also able to release formaldehyde.
However, high quality leather requirements cannot be met unless a wide range of tanning and retanning agents, dyeing auxiliaries and fatliquors are used. It therefore appears necessary to develop a leather-producing technology that meets high quality demands and guarantees a minimal risk of formaldehyde release from the finished product.
Attempts to bind free and releasable formaldehyde in leather with scavenging compounds have been reported and the modification of some technological steps has also been investigated.
However, another way to reduce the formaldehyde content of leather is to select the recipe components on the basis of their potential to release formaldehyde. Even so, an adequate analytical method to determine the free formaldehyde in tanning agents and auxiliaries had not been previously developed.
Within this investigation the development and validation of such a method was therefore essential. Furthermore, it was important to take into account that the interaction between chemicals and the leather matrix might generate synergistic effects. Also the ageing process of leather could involve formaldehyde release. Finally, several compounds needed testing regarding their suitability as formaldehyde scavengers. |
| Note de contenu : |
- A test method for the determination of free formaldehyde
- Materials for assessment and scope of the investigation
- The production of formaldehyde-free leather
- The influence of product selection
- Determination of free formaldehyde in tannins and auxiliaries
- The production of formaldehyde-free leather
- The influence of product selection
- The influence of ageing
- Panel 1 : The release and collection of formaldehyde from leather making products
- Panel 2 : Free formaldehyde in different product classes
- Panel 3 : Inorganic compound: effect of sodium disulphite (chrome tanned leather)
- Panel 4 : Inorganic compound : effect of Auxiliary A (chrome tanned leather)
- Panel 5 : Organic compound: effect ofAuxiliary B (chrome tanned leather)
- Panel 6 : Efficiency of the tested scavengers (VDA 275, chrome tannage)
- Panel 7 : Development of recipes for low formaldehyde release (chrome tannage)
- Panel 8 : Development of recipes for low formaldehyde release (chrome-free tannage)
- Panel 9 : Artificial ageing parameters
- Panel 10 : Results of artificial ageing experiments on chrome tanned leather
- Panel 11 : Results of artificial ageing experiments on chrome-free leather
- Panel 12 : Chrome tanned leather : Variation of formaldehyde content during storage
- Panel 13 : Chrome free leather : variation of formaldehyde content during storage |
| En ligne : |
https://drive.google.com/file/d/1_OebkuER7Ocv7ObV5t4-vhLMPJrsUl1a/view?usp=drive [...] |
| Format de la ressource électronique : |
pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32463 |
in WORLD LEATHER > Vol. 18, N° 4 (06-07/2005) . - p. 23-27
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