Preparation and assistant-dyeing of formaldehyde-free amphoteric acrylic retanning agent / Jian zhong Ma in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 13 p. Titre : Preparation and assistant-dyeing of formaldehyde-free amphoteric acrylic retanning agent Type de document : texte imprimé Auteurs : Jian zhong Ma, Auteur ; Mengxin Wu, Auteur ; Zhenhua Tian, Auteur Année de publication : 2021 Article en page(s) : 13 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de tannage Colorants -- Propriétés tinctoriales Colorants acides Composés amphotériques Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés organoleptiques Cuirs et peaux -- Propriétés physiques Cuirs et peaux -- Propriétés thermiques Cuirs et peaux -- Teinture Environnement -- Etudes d'impact Formaldéhyde Glutaraldéhyde Polyacryliques Retannage Tannage synthétique Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : With the enhancement of environmental protection consciousness, concerns have been raised about non-toxic and biodegradable leather retanning agents. According to the European standard 2002/231/EC, the free formaldehyde content of leather products should be less than 150 mg/kg. As one of the retanning agents in the market, the content of free formaldehyde in the Multifunctional retanning agent (MTA) is 372.22 mg/kg and higher than the limit value. In this work, glutaraldehyde as an alternative of formaldehyde was used to modify acrylic polymer and an amphoteric acrylic retanning agent was prepared. Then it was used in retanning process, and its retanning and assistant-dyeing properties were investigated. The results showed that the free formaldehyde content of amphoteric acrylic retanning agent modified with glutaraldehyde was only 4.17 mg/kg. Meanwhile, the presence of amino groups in the amphoteric acrylic retanning agent improved the dyeing properties of leather by electrostatic attraction. Compared with the leather treated with anionic acrylic retanning agent, the residual dye concentration of the dyeing effluent of the retanned leather with amphoteric acrylic retanning agent decreased from 17.4 mg/L to 10.0 mg/L, and the dyed leather had better resistances to friction and water-washing. In addition, the BOD5/COD value of the wastewater after Mannich base polymer retanning was only 0.32, indicating that the retanning agent was biodegradable. Moreover, the leather retanned with amphoteric acrylic retanning agent had good thermal stability, fullness and physical and mechanical properties. Note de contenu : - EXPERIMENTAL : Materials - Preparation of retanning agent - Application - Free formaldehyde content of leather - Free formaldehyde content of retanning agent - Leather surface color depth (K/S) - Color fastness to cycles of to-and-fro rubbing (wet/dry) - Color fastness to washing (discoloration) - Gain of leather - Physical-mechanical property - Softness - RESULTS AND DISCUSSION : Amination degree - 1H NMR spectra - FT-IR spectra - Analysis of molecular weight and molecular weight distribution - Zeta potential - Free formaldehyde content - Thermal properties - Dyeing properties - Physical-mechanical properties of leathers - Organoleptic properties of leathers - Environmental impact assessments - Table 1 : Specific operation of conventional and experimental processesa - Table 2 : GPC results of GAMP, MTA and P - Table 3 : The free formaldehyde contents of different retanning agents and corresponding retanned leathers - Table 4 : Blackness of leather before and after washing with soapy water five times and whiteness of wet and dry interlining cloths rubbed on the dyed leathers - Table 5 : Biochemical oxygen demand (BOD5) and Chemical oxygen demand (COD) of the wastewater after retanning DOI : https://doi.org/10.1186/s42825-021-00066-z En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00066-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37551 [article]

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