Development of reference materials for inorganic elements in leather powder / Qian Wang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 6 (11-12/2018)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 102, N° 6 (11-12/2018) . - p. 304-311 Titre : Development of reference materials for inorganic elements in leather powder Type de document : texte imprimé Auteurs : Qian Wang, Auteur ; Chao Wei, Auteur ; Liandi Ma, Auteur Année de publication : 2018 Article en page(s) : p. 304-311 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse spectrale Chimie analytique Composés inorganiques Cuirs et peaux -- Analyse Poudre de cuir Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Three reference materials for As, Cd, Co, Cu, Hg, Ni, Pb and Sb - 8 inorganic elements in leather powder were developed with relatively low, middle and high concentrations. The reference materials were prepared by adding an appropriate concentration using industrial process. The concentration range of the three levels is within the +/- 200% of the limited value in the China statute Safety Technical Specifications for Children's Footwear (GB 30585-2014). By using 16 units with duplicate analysis, it was shown that the samples were enough to demonstrate the homogeneity of these candidate reference materials. The statistical results from the stability test, also showed no significant trends in both short-term stability test for one week at 40°C and long-term stability test for 23 months. This set of reference materials, were used for more than two certification methods - including isotope dilution inductively coupled plasma mass spectrometry (ID-ICP-MS), inductively coupled plasma mass spectroscopy (ICP-MS) and inductively coupled plasma optical emission spectroscopy (ICP-OES). The combined relatively standard uncertainties of the reference values were estimated by considering the uncertainties of the analytical methods, homogeneity and stability. The range of the expanded uncertainties of all the elements is from 3% to 5%. The certified reference materials (CRMs) are primarily intended for use in the calibration and validation of procedures for the determination of inorganic elements in leather or similar leather samples. Note de contenu : - Instrumentation - Reagents and standards - Preparation of candidate materials - Homogenity - Stability monitoring - Moisture content correction - Measurement methods for certified values and relative uncertainty - ID-ICP-MS (Cd, Cu, Hg, Ni, Pb, Sb) - ICP-MS (8 elements) - ICP-OES (8 elements) - Determination of standard values - Uncertainty evaluation - Uncertainty (uc) due to characterisation process - The combined standard uncertainty - Expanded uncertainty En ligne : https://drive.google.com/file/d/1iIR1yv69vTVvjgM16Zbw4-JT5X3dSASE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31336 [article]

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Synthesis of ionic liquid-based amphiphilic polymer surfactant and its application in leather fatliquoring / Hao Dongyan 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. Titre : Synthesis of ionic liquid-based amphiphilic polymer surfactant and its application in leather fatliquoring Type de document : texte imprimé Auteurs : Hao Dongyan, Auteur ; Xing Zhu, Auteur ; Hao Dongyu, Auteur ; Chao Wei, Auteur ; Hu Yujie, Auteur ; Wang Xuechuan, Auteur Année de publication : 2023 Article en page(s) : p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Croûte (cuir) On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés. Cuirs et peaux -- Propriétés physiques Cuirs et peaux de moutons Douceur (toucher) Emulsions Granulométrie Liquides ioniques Polymères -- Synthèse Polymères amphiphiles Surfactants -- Synthèse Wet-white (tannage) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In view of the environmental pollution caused by chrome tanning in current tanning processes, the development of chrome-free ecological leather manufacturing technology is an important direction for the development of the leather industry. However, the strong negative charge of chrome-free tanned leather leads to the reduction of binding sites of most anionic dyeing and finishing materials, resulting in colour fading and poor handle of the finished leather. Therefore, this paper mainly uses Nvinylimidazole, bromodecan and dimethylaminoethyl acrylate as raw materials to synthesise a ionic liquid-based amphiphilic polymer surfactant through free radical polymerisation and quaternisation and then, uses it in the fatliquoring process of a chrome-free non-metallic tanned green leather. The structure and morphology of the fatliquored wet-white leather were studied by SEM and the ultra depth of a field microscope, and the softness and physical and mechanical properties of the fatliquored leather were tested. The results showed that the collagen fibres were loosely distributed and the gap between the collagen fibres was larger after fatliquoring,and the softness and physical and mechanical properties of the fatliquored leather were improved. Note de contenu : - EXPERIMENTAL SECTION : Materials - Methods - Characterisation - RESULTS AND DISCUSSION : FTIR analysis - 1H-NMR analysis - Surface tension - Emulsion particle size test - Physical property testing of crust leather - SEM observations - Ultra depth of field microscope - Table 1 : Fatliquoring process for sheep wet-white leather tanned by F-90 - Table 2 : Test results of physical properties of crust leather En ligne : https://drive.google.com/file/d/1lHYlywraBbreP7FKgn902_KBzii8LmAB/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39065 [article]

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