Fluorescence labelling of amphoteric acrylic retanning agent / Jin Liqiang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 108, N° 4 (07-08/2024)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 108, N° 4 (07-08/2024) . - p. 185-190 Titre : Fluorescence labelling of amphoteric acrylic retanning agent Type de document : texte imprimé Auteurs : Jin Liqiang, Auteur ; Gaosheng Zou, Auteur ; Wenbin Xun, Auteur ; Yulu Wang, Auteur ; Zhang Feifei, Auteur ; Hongxia Zhu, Auteur Année de publication : 2024 Article en page(s) : p. 185-190 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de tannage Caractérisation Composés amphotériques Cuirs et peaux Fluorescence Marquage (technologie) Polyvinylamine Retannage Transfert de masse Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In recent years, there has been a growing focus on amphoteric retanning materials due to their crucial role in enhancing the electropositivity of retanned leather and improving the absorption of anionic dyes and fatliquors. This paper introduces a novel design and successful preparation of amphoteric retanning agents. Initially, a series of poly(N-vinylformamide-co-acrylic acid) copolymers were synthesized through a free radical copolymerization reaction initiated by azodiisobutyamidine hydrochloride. Subsequently, these polymers were hydrolyzed to produce an amphoteric retanning agent (A-PVAm) with a solid content of 15 %(Wt). Their structures were characterized using FT-IR, and their isoelectric points were determined through a zeta potential analyzer. Following this, a fluorescent tracer (FA-PVAm) was synthesized by reacting fluorescein 5-isothiocyanate with A-PVAm. This tracer was utilized to monitor the real-time penetration and mass transfer of A-PVAm during the retanning process as a signaling agent. The mass transfer of A-PVAm was observed concerning dosage and running time. It was observed that within 60 minutes, A-PVAm could evenly distribute throughout the leather. In instances where the retanning agent dosage was inadequate, the inner part of the crust showed minimal presence of the retanning agent. However, at dosages exceeding 20 %, the retanning agent exhibited uniform distribution within the leather. The utilization of the fluorescent tracing technique proved effective in creating a tracer to monitor the penetration of the amphoteric acrylic resin retanning agent in leather. This approach can assist in optimizing the molecule structure of the polyacrylate retanning agent and analyzing its mechanism of action. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Preparation of poly (N-vinylformamide-co-acrylic acid) copolymer (PNVF) - Preparation of amphoteric polyvinylamine retanning agent (A-PVAm) - The mass transfer and distribution of A-PVAm in crust - RESULTS AND DISCUSSION : Characterization of (PNVF) - Characterization of A-PVAm - Characterization of FA-PVAm - The mass transfer and distribution of A-PVAm in crust - Table 1 : Recipe of the preparation of PNVF - Table 2 : The application formulation of A-PVAm En ligne : https://drive.google.com/file/d/1l6KtiiRU5KjinwvROAzHg82Dvg4fcu9O/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41405 [article]

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Fluorescence labelling of amphoteric acrylic retanning agent and its mass transfer behaviour / Liqiang Jin in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 108, N° 5 (09-10/2024)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 108, N° 5 (09-10/2024) . - p. 249-254 Titre : Fluorescence labelling of amphoteric acrylic retanning agent and its mass transfer behaviour Type de document : texte imprimé Auteurs : Liqiang Jin, Auteur ; Gaosheng Zou, Auteur ; Wenbin Xu, Auteur ; Yulu Wang, Auteur ; Feifei Zhang, Auteur ; Hongxia Zhu, Auteur Année de publication : 2024 Article en page(s) : p. 249-254 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de tannage Caractérisation Composés amphotériques Cuirs et peaux Fluorescence Formulation (Génie chimique) Marquage (technologie) Polyvinylamine Transfert de masse Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In recent years, there has been a growing focus on amphoteric retanning materials due to their crucial role in enhancing the electropositivity of retanned leather and improving the absorption of anionic dyes and fatliquors. This paper introduces a novel design and successful preparation of amphoteric retanning agents. Initially, a series of poly(N-vinylformamide-co-acrylic acid) copolymers were synthesized through a free radical copolymerization reaction initiated by azodiisobutyamidine hydrochloride. Subsequently, these polymers were hydrolyzed to produce an amphoteric retanning agent (A-PVAm) with a solid content of 15%(Wt). Their structures were characterized using FT-IR, and their isoelectric points were determined through a zeta potential analyzer. Following this, a fluorescent tracer (FA-PVAm) was synthesized by reacting fluorescein 5-isothiocyanate with A-PVAm. This tracer was utilized to monitor the real-time penetration and mass transfer of A-PVAm during the retanning process as a signaling agent. The mass transfer of A-PVAm was observed concerning dosage and running time. It was observed that within 60 minutes, A-PVAm could evenly distribute throughout the leather. In instances where the retanning agent dosage was inadequate, the inner part of the crust showed minimal presence of the retanning agent. However, at dosages exceeding 20%, the retanning agent exhibited uniform distribution within the leather. The utilization of the fluorescent tracing technique proved effective in creating a tracer to monitor the penetration of the amphoteric acrylic resin retanning agent in leather. This approach can assist in optimizing the molecule structure of the polyacrylate retanning agent and analyzing its mechanism of action. Note de contenu : - EXPERIMENTAL PROCEDURES : - Materials - Preparation of poly (N-vinylformamide-co-acrylic acid) copolymer (PNVF) - Preparation of amphoteric polyvinylamine retanning agent (A-PVAm) - Fluorescence labeling of A-PVAm - Characterization - Fluorescence Emission Spectra - The mass transfer and distribution of A-PVAm in crust - RESULTS AND DISCUSSIONS : - Characterization of (PNVF) - Characterization of A-PVAm - Characterization of FA-PVAm - The mass transfer and distribution of A-PVAm in crust - Table 1 : Recipe of the preparation of PNVF - Table 2 : The application formulation of A-PVAm En ligne : https://drive.google.com/file/d/1liP09X8TGng0avwWsDJk7Rni8Da8Gogz/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41603 [article]

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