Evaluation of environmental impact of typical leather chemicals. Part 2 : Biodegradability of organic tanning agents by activated sludge / Danhong Sun in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 2 (03-04/2008)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 92, N° 2 (03-04/2008) . - p. 59-64 Titre : Evaluation of environmental impact of typical leather chemicals. Part 2 : Biodegradability of organic tanning agents by activated sludge Type de document : texte imprimé Auteurs : Danhong Sun, Auteur ; Qiang He, Auteur ; Zhang Wenjun, Auteur ; Yulu Wang, Auteur ; Bi Shi, Auteur Année de publication : 2008 Article en page(s) : p. 59-64 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acrylique Agents de tannage Aldéhydes Un aldéhyde est un composé organique, faisant partie de la famille des composés carbonylés, dont l'un des atomes de carbone primaire (relié au plus à 1 atome de carbone) de la chaîne carbonée porte un groupement carbonyle. L'aldéhyde le plus simple est le formaldéhyde (ou méthanal), aussi appelé formol lorsqu'il est en solution aqueuse. Un aldéhyde dérive formellement d'un alcool primaire (oxydation) dont le groupement hydroxyde -OH est en bout de chaîne et se forme suite à l'enlèvement de deux atomes H d'où le nom "alcool déshydrogéné" ou aldéhyde. Biodégradation Boues résiduaires -- Analyse Composés aromatiques Composés organiques Cuirs et peaux -- Industrie -- Aspect de l'environnement Environnement -- Etudes d'impact Evaluation Syntans Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The biodegradability of typical organic tanning agents, including aromatic syntans, aldehydic tanning agents and acrylic tanning agents, were investigated. The results showed that the biodegradation behaviours of these leather chemicals are closely associated with their chemical structures, molecular weights and compositions. Therefore, different organic tanning agents might result in different environmental impacts even though they belong to the same type of tanning agent. The four aromatic syntans tested exhibited low biodegradability in general. Among them, a phenol-based syntan was not biodegradable and the phenol-sulphone based syntan produced a strong inhibitory effect on respiration of activated sludge. Comparatively, the naphthalene-based syntan was somewhat easier to biodegrade than other aromatic syntans. In the cases of aldehydic tanning agents, both formaldehyde and glutaraldehyde were not biodegradable and were toxic to organisms in activated sludge. Thus, they are potential inhibitors to biodegradation of other organic compounds in wastewater. However, an aliphatic aldehydic tanning agent was biodegradable and showed no toxicity to microorganisms in activated sludge. As for acrylic tanning agents, results indicated that commercial anionic products do not have any negative effect on biodegradation activity of activated sludge but they themselves were hardly biodegraded. Whereas, cationic acrylic tanning agents have the potential to inhibit the activated sludge process when presented at a high concentration. Note de contenu : - Biodegradability of aromatic syntans - Biodegradability of aldehydic tanning agents - Biodegradability of acrylic tanning agents - Table 1 : The types and main properties of organic tanning agents used in experiments - Table 2 : BOD5 /COD values of aromatic syntans - Table 3 : BOD5 /COD values of aldehydic tanning agents En ligne : https://drive.google.com/file/d/1O2b7myavpoCSbVBi0--SckW-RKh98-ca/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38931 [article]

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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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Mechanism of the influence of the fatliquor on the bio-decolourization of an azo dye / Li Yanchun in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 4 (07-08/2015)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 4 (07-08/2015) . - p. 163-171 Titre : Mechanism of the influence of the fatliquor on the bio-decolourization of an azo dye Type de document : texte imprimé Auteurs : Li Yanchun, Auteur ; Zheng Liwen, Auteur ; Yulu Wang, Auteur Année de publication : 2015 Article en page(s) : p. 163-171 Note générale : Abbrev. - Bibliogr. Langues : Anglais (eng) Catégories : Colorants azoïques Décoloration Poly-3-hydroxybutyrate Poly-B-hydroxybutyrate Produits de nourriture du cuir Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In the treatment of tannery wastewater, other chemical agents such as tannins and fatliquors may possibly have an influence on bio-decolourization of dyes, few researchers have addressed that problem. This paper reports how four kinds of commercial fatliquors influence the bio-decolourization of an azo dye (Acid Fuchsin 6B as the experimentat object) and expounds the mechanisms of these influence processes. it was obvious that the addition of sulfonated fatliquor and oxidized-sulfited fatliquor have improved the bio-decolourization activity of Acid Fuchsin 66, by contrary, the bio-decolourization of the dye has been stopped virtually by the addition of Lecithin based fatiguer and Phosphoric esters fatliquor. The paper used LC/MS to analyze and quantify metabolites of the dye in various substrates. The results certify that a stimulation of degradation products of these fatliquors on the breaking of the azo linkage contributes to the improvement of the bio-decolourization of the azo dye. And according to the correlation coefficient of the poly-?-hydroxybutyrate production with the residual concentrations of the dye, the inhibition of the fatliquors with phosphate groups on the bio-decolourization is directly due to the formation of the poly?-p-hydroxybutyrate. Note de contenu : - EXPERIMENTAL DETAILS : Materials - Inoculum - Bio-decolourization of acid fuchsin 6B and biodegradation of the fatliquors - ANALYTICAL METHODS - RESULTS AND DISCUSSION : The bio-decolourization of acid fuchsin 6B using various fatliquors as the co-substrates - The mecanism of the improvement by the fatliquor to the biological decolourization - The inhibition mechanism of the fatliquor on the biological decolourization En ligne : https://drive.google.com/file/d/1aBdd2k-VrWaSTOxOcAXUxL2fOFkMYz7Z/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24557 [article]

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Preparation and application of an amphiphilic acrylic copolymer as a retanning agent / Jin Liqiang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 5 (09-10/2014)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 98, N° 5 (09-10/2014) . - p. 222-228 Titre : Preparation and application of an amphiphilic acrylic copolymer as a retanning agent Type de document : texte imprimé Auteurs : Jin Liqiang, Auteur ; Wei Yanwei, Auteur ; Yulu Wang, Auteur ; Li Yanchun, Auteur Année de publication : 2014 Article en page(s) : p. 222-228 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : acrylique, Acide L'acide acrylique ou acide acroléïque ou acide prop-2-énoïque est un composé organique de formule brute C3H4O2 et de formule semi-développée CH2=CHCOOH. C'est un acide carboxylique et un alcène vinylique, et se présente comme un liquide incolore à l'odeur âcre. L'acide acrylique et ses esters, les acrylates, sont utilisés dans la fabrication de matières plastiques, dans les peintures acryliques et dans divers autres polyacryliques qui ont de multiples usages. Agents de tannage Allongement à la rupture Analyse mécanique dynamique Cuirs et peaux -- Analyse Cuirs et peaux -- Propriétés mécaniques Déchirure (mécanique) Diffractométrie de rayons X Microscopie électronique à balayage Polyacrylate de lauryle Polymères amphiphiles Retannage Rupture (mécanique) Stabilité thermique Syntans Taille des particules Traction (mécanique) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : It has been found that the performance of the product is strongly affected by the composition of the amphiphilic polymer. The leather retanned by the amphiphilic polymeric syntan achieves an improvement of mechanical properties, as well as enhancement of thermal stability. The results of instrumental analysis also provide evidence to the applicability of the prepared copolymer as an efficient retanning agent for chrome-tanned leather. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Preparation of the copolymer syntan - Application of copolymers in retanning - Characterization - RESULTS AND DISCUSSIONS : Preparation of the LQ series - Retanning properties - SEM analysis of leather - XRD analysis of leather - DMA analysis of leather En ligne : https://drive.google.com/file/d/1Xskry0H7_P8rELqHApQQuerNQAv6eK4W/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22274 [article]

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Preparation and application of a high exhaustion chrome tanning auxiliary from limed fleshings / Hongjiao Liang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 107, N° 3 (05-06/2023)  

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Preparation and application of a novel cationic fatliquoring agent / Yang Hong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 103, N° 1 (01-02/2019)  

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Synthesis, properties and application in leather colouration of novel polymeric dye based on hyperbranched poly(amine-ester) / Yulu Wang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 4 (07-08/2017)  

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