| Titre : |
Physical and fastness properties of leather dyed with a natural dye extracted from beetroot peels using a biomordant |
| Type de document : |
texte imprimé |
| Auteurs : |
Louret A. Andalo, Auteur ; Paul K. M. Sang, Auteur ; Rose Tanui, Auteur |
| Année de publication : |
2023 |
| Article en page(s) : |
p. 226-231 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Acacia et constituants
Colorants végétaux
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux -- Propriétés physiques
Cuirs et peaux -- Teinture
Cuirs et peaux de chèvres
Mordants (chimie)
Post-tannage
Tannage au chrome
|
| Index. décimale : |
675 Technologie du cuir et de la fourrure |
| Résumé : |
Leather dyeing is an essential process in the leather industry, where synthetic dyes are predominantly used. However, the environmental concerns associated with synthetic dyes have led to rising interest in natural dyes as sustainable alternatives. The use of biomordants is however, gaining attention due to their eco-friendly nature and potential to enhance dye fixation and colour fastness. This study aimed at determining the physical and fastness properties of leather dyed using natural dye extract from beetroot peels with the assistance of a biomordant derived from Acacia nilotica barks and banana pseudo stem sap. The dyeing process involved the use of the biomordant in both a pre and post-mordanting technique. Various fastness properties of dyed leather were investigated to assess the quality and durability of the dyeing process including water spotting fastness according to ISO 15700, mild washing fastness according to ISO 15703, and rub fastness (dry and wet rub fastness) according to ISO 11640. To determine the effect of the biomordant on the strength properties of the leather, the physical properties of the dyed leather were also evaluated. The tensile and tear strength of the dyed leather were measured on an Instron using IUP 6. The dye bath exhaustion was measured using spectrophotometric analysis. The dyed leatherʼs fastness properties were discovered to be good to excellent on a grey scale of 5. All of the samples exceeded the minimum recommended values (UNIDO 1996) for tensile strength (>20N/mm2), percentage elongation at break (>40%), and tear strength (>30N/mm). The samples dyed with Acacia nilotica bark as a biomordant had the highest dye bath exhaustion, followed by banana pseudo stem sap, and leather dyed without any mordant had the lowest dye bath exhaustion. According to the results obtained in this study, the use of biomordant in the dyeing of leather with natural dye from beetroot peels improved the fastness properties of the dyed leather as well as the strength of the resulting leather. Furthermore, the biomordant promoted dye uptake. |
| Note de contenu : |
- MATERIALS AND METHODS : Materials - Methods - Physical properties of the dyed leather
- RESULTS AND DISCUSSION : Analysis of the physical properties of the dyed leather -
- Table 1 : Process for pre tanning goatskin
- Table 2 : Process for chrome tanning of goat wet-blue
- Table 3 : Post tanning process
- Table 4 : Tensile strength and percentage elongation of the dyed leather
- Table 5 : Tear strength of the dyed leather
- Table 6 : Fastness properties of the dyed leather both the mordanted and the umordanted samples on a grey scale of 5 |
| En ligne : |
https://drive.google.com/file/d/1G2w2KoZPKkzUblyRJeLJYFRmat4LDXbz/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40242 |
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 107, N° 6 (11-12/2023) . - p. 226-231
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