| Titre : |
Comparative study of retanning properties of melamine-glyoxal resins produced by different sulfonating agents |
| Type de document : |
texte imprimé |
| Auteurs : |
Muhammad Naveed Ashraf, Auteur ; Shahzad Maqsood Khan, Auteur ; Shahid Munir, Auteur ; Rashid Saleem, Auteur |
| Année de publication : |
2022 |
| Article en page(s) : |
p. 205-214 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Composés organiques -- Synthèse
Cuirs et peaux -- Propriétés mécaniques
Eaux usées -- Analyse
Etudes comparatives
Mélamine glyoxal
Retannage
Tannage synthétique
|
| Index. décimale : |
675.2 Préparation du cuir naturel. Tannage |
| Résumé : |
Amino resins have many applications including leather retanning. Being condensation products of formaldehyde, amino resins are one of the sources of free formaldehyde in leather. ln this work novel glyoxylated melamine resins were produced to make formaldehyde-free leather. The optimised process of synthesis was used to produce stable resins which were able to polymerise further in situ at retanning pH conditions. Water solubility of the resins was achieved by using various aromatic sulfonating agents including, orthanilic acid (ONA), metanilic acid (MNA), sulfanilic acid (SNA) and aniline 2,5-disulfonic acid (ADS). Synthesised resins were used in leather retanning to evaluate their comparative mechanical properties, organoleptic properties, free formaldehyde content and SEM analysis. The effluent of each retanning bath was also analysed for pollution load studies. All the resins showed improvements in mechanical and organoleptic properties in comparison with a commercial melamine resin but, the novel resin MGSNA exhibited remarkable results.
Estimation of free formaldehyde content showed absence of free formaldehyde content in leather and retanning effluent of all the novel resins. Determination of COD, TDS and TSS of effluent confirmed a significant reduction in pollution load due to improved exhaustion of resins attributed to their in-situ polymerisation in collagen fibres to enhance their fixation.
SEM analysis of leather confirmed improvements in retanning results due to formation of more orderly arranged networks of collagen fibres. Moreover, the introduction of an aromatic ring in the resin structure resulted in improved thermal stability of the resins. The results indicate that this development is remarkable for production of formaldehyde-free leather with improved retanning properties along with reduction in water pollution. This work also addresses the carcinogenic effects of formaldehyde. |
| Note de contenu : |
- EXPERIMENTAL PROCEDURE : Chemicals and apparatus - Synthesis of novel melamine-glyoxal resins
- RESULTS AND DISCUSSION : Synthesis of resins - Leather applications of various novel glyoxal based melamine resins - Mechanical properties of leather reatanned with glyoxal-based melamine resins - Orgnoleptic properties of the leather retanned with glyoxal-based melamine resins - SEM analysis - Quantitative estimation of free formaldehyde content in retanned leather - Thermogravimetric analysis - Effluent analysis - Structural elucidation
- Table 1 : Mole ratio and physical characteristics of prepared novel melamine resins
- Table 2 : Leather processing materials, conditions and recipe
- Table 3 : Mechanical properties of leather retanned with glyoxal based melamine resins
- Table 4 : Comparative study of effluent produced from retanning baths of synthesised resins |
| En ligne : |
https://drive.google.com/file/d/1d731nM2Y_RzuR-xX0DT3EX7AtII9e3uS/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38195 |
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 106, N° 5 (09-10/2022) . - p. 205-214
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Comparative study of retanning properties of melamine-glyoxal resins produced by different sulfonating agents in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 5 (09-10/2022)
