Interaction between protocatechuic acid and zirconium ions and their tanning properties / Chunqiong Li in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 107, N° 1 (01-02/2023)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 107, N° 1 (01-02/2023) . - p. 11-15 Titre : Interaction between protocatechuic acid and zirconium ions and their tanning properties Type de document : texte imprimé Auteurs : Chunqiong Li, Auteur ; Haojie Qin, Auteur ; Shu Chen, Auteur ; Jie Yu, Auteur ; Xiaojun Shen, Auteur Année de publication : 2023 Article en page(s) : p. 11-15 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de tannage Caractérisation Ions zirconium Protocatéchuique, Acide Tannage combiné Le tannage combiné se dit des tannages qui allient deux familles ou genre de tannage pour obtenir un résultat additionnant les qualités complémentaires des tannins mis en Å“uvre par exemple Chrome-Végétal ou Chrome-Synthétique Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The interaction between protocatechuic acid (PCA) and zirconium ions has been studied via UV-Vis, FTIR and 1H-NMR spectra. The results show that the phenolic hydroxyl and carboxyl groups of PCA can coordinate with zirconium ions. The tanning performance of the protocatechuic acid combined with zirconium ions has been studied. The results show that the shrinkage temperature of the leather can reach 86-87°C in both Zr-PCA combined tanning and PCA-Zr combined tanning. Different tanning orders will lead to different pH values being required to achieve the best tanning effect, which is probably caused by the different interactions among PCA, zirconium ions and collagen fibres during the tanning process. Note de contenu : - MATERIALS AND METHODS : Materials - Experimental methods - Characterisation - RESULTS AND DISCUSSION : Preparation and characterisation of PCA zirconium complex - Tanning properties En ligne : https://drive.google.com/file/d/13axnV0UQ1hpbYt_Cy_CCUBaKRkWLka_N/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38867 [article]

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Research on two-step synthesis method of 12-hydroxystearate diethanolamide / Ziling Zhao in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 107, N° 2 (03-04/2023)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 107, N° 2 (03-04/2023) . - p. 55-59 Titre : Research on two-step synthesis method of 12-hydroxystearate diethanolamide Type de document : texte imprimé Auteurs : Ziling Zhao, Auteur ; Haojie Qin, Auteur ; Pei Mao, Auteur ; Shixing Gong, Auteur ; Xiaojun Shen, Auteur Année de publication : 2023 Article en page(s) : p. 55-59 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : 12-hydroxystearate diethanolamine Acylation Ammonolyse Caractérisation Chimie analytique Composés organiques -- Synthèse Fourier, Spectroscopie infrarouge à transformée de Produits de nourriture du cuir Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : 12-hydroxystearate diethanolamine, an intermediate for a leather fatliquoring agent, was prepared by two-step synthesis of amidation reaction and ammonolysis reaction through vacuum distillation dehydration, using 12-hydroxystearic acid and diethanolamine as raw materials. Through single factor experiments, the optimised synthesis conditions were determined as follows: the molar ratio of 12-hydroxystearic acid to diethanolamine was 1:1.03, and the temperature of the first amidation reaction was 135°C and the reaction time was 4 hours. In the second step of ammonolysis reaction, the reaction temperature was 70°C, the amount of sodium ethylate (sodium ethoxide) used as catalyst was 1.5% of the mass of 12-hydroxystearic acid, and the reaction time was 2 hours. Under the optimised conditions, the yield of the product could reach 90.9%. The structures of 12-hydroxystearate diethanolamide were characterised by FTIR spectrum. Note de contenu : - MATERIALS AND METHODS : Materials - Experimental methods - Analytical methods - RESULTS AND DISCUSSION : Acylation reaction - Ammonolysis reaction - FTIR analysis - Table 1 : Effect of first step reaction temperature on the ratio of products En ligne : https://drive.google.com/file/d/1UNNfqZm_-rhgnyO37uoBvTtJzFeyrL8P/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39064 [article]

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Study of the synthesis of sulfonated and succinated lanolin acid fatliquoring agent / Haojie Qin in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 108, N° 2 (03-04/2024)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 108, N° 2 (03-04/2024) . - p. 51-56 Titre : Study of the synthesis of sulfonated and succinated lanolin acid fatliquoring agent Type de document : texte imprimé Auteurs : Haojie Qin, Auteur ; Guoping Qian, Auteur ; Jianghao Wu, Auteur ; Xiaojun Shen, Auteur Année de publication : 2024 Article en page(s) : p. 51-56 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Amidation Anhydride maléique Composés organiques -- Synthèse Diéthanolamine Esterification Huiles et graisses synthétiques Lanoline Succination sulfite de sodium Sulfonation Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The sulfonated and succinated lanolin acid fatliquoring agent was prepared from lanolin acid by amidation with diethanolamine, monoesterification with maleic anhydride and sulfonation with anhydrous sodium sulfite. Through single factor experiments, the optimised synthesis conditions were determined as follows: the temperature of amidation reaction was 135°C and the reaction time was 5 hours, the amidation yield could reach 94.4 %. In the monoesterification reaction, the molar ratio of maleic anhydride to theoretical hydroxyl groups of the system was 1:1.1, the reaction temperature was 95°C and the reaction time was 2 hours, and the esterification rate could reach 86.1%. In the sulfonation reaction, the molar ratio of maleic anhydride to sodium sulfite was 1:1.05, the reaction temperature was 80°C and the reaction time was 3 hours. Under the optimised conditions, the yield of product could reach 94.9 %, and the structures were characterised by FTIR spectrum. Note de contenu : - MATERIALS AND METHODS : Materials - Experimental methods - Analytical methods - RESULTS AND DISCUSSION : Effect of reaction temperature and time on - Effect of reaction temperature and time on monoesterification amidation - Effect of molar ratio on monoesterification - Effect of reaction temperature and time on sulfonation - Effect of molar ratio on sulfonation - FTIR analysis - Table 1 : Effect of reaction temperature on the proportion of acylation reaction products En ligne : https://drive.google.com/file/d/1LjuD_diJIOs7QJWzVqBz0Z0iiSKXv0lE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40931 [article]

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