A new way to treat chrome leather shavings : collagen degradation product as cement retarder / Bangquan Wei in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 105, N° 3 (05-06/2021)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 105, N° 3 (05-06/2021) . - p. 159-165 Titre : A new way to treat chrome leather shavings : collagen degradation product as cement retarder Type de document : texte imprimé Auteurs : Bangquan Wei, Auteur ; Xiaoliang Ding, Auteur ; Zhihua Shan, Auteur Année de publication : 2021 Article en page(s) : p. 159-165 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique Caractérisation Collagène -- Détérioration Cuirs et peaux -- Déchets -- Recyclage Diffractométrie de rayons X Matériaux cimentaires -- Additifs Produits de dégradation du collagène Retardateur de ciment Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Chrome leather shavings generated in leather making have always been a difficult to handle handle solid waste. Inspired by a protein-based gypsum retarder, a collagen degradation product (CDP) obtained from chrome leather shavings has been developed as a Portland cement retarder. The effect of CDP on the setting, strength, crystal morphology, and hydration process of cement were investigated. The results showed that after adding CDP, the setting time of cement was effectively prolonged. 0.1% CDP could delay the initial setting time from 150 minutes to 300 minutes and final setting time from 200 minutes to 370 minutes. SEM observation revealed that the cement crystals changed from needle-like to massive clusters with the addition of CDP. Furthermore, TG/DSC and XRD analysis showed that the addition of CDP inhibited the hydration process of cement reactants (alite and belite) and the formation of hydration product (Ca(OH)2). This study provides not only new ideas for the research of cement retarders but also a new method for treating waste leather shavings. Note : Alite and belite are phases in portland cement based materials. Alite is impure tricalcium silicate (C3S) and belite is impure dicalcium silicate (C2S). Although both are calcium silicates, alite reacts much more quickly than belite when mixed with water. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Characterisation of CDP - Retarding effect of CDP - RESULTS AND DISCUSSION : The composition of CDP - Analysis of strength - Analysis of crystal morphology - Analysis of X-ray diffraction - Analysis of DSC/TG - Table 1 : The chemical components of cement - Table 2 : The composition of CDP - Table 3 : Molecular weight of CDP En ligne : https://drive.google.com/file/d/1FX5VUhHnkKgH4deScuAg3LNTTpB3RYsH/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35836 [article]

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Study on a new gypsum retarder from finished leather waste / Minggao Deng in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 3 (05-06/2022)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 106, N° 3 (05-06/2022) . - p. 106-111 Titre : Study on a new gypsum retarder from finished leather waste Type de document : texte imprimé Auteurs : Minggao Deng, Auteur ; Xiaoliang Ding, Auteur ; Zhihua Shan, Auteur Année de publication : 2022 Article en page(s) : p. 106-111 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Cuir -- Déchets Cuirs et peaux -- Détérioration Déchets industriels -- Elimination Gypse Hydratation Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The disposal of finished leather waste (FLW) has always been a concern of the tanning industry. In this paper, the finished leather degradation solution (LDS) was obtained from the alkali-heat degradation of FLW at an 84.4% extraction rate. The solid Collagen Degradation Product (CDP) of LDS contains 47.1mg/kg of chromium. When the LDS was used for gypsum retardation, with the dosage of LDS increased, the setting time of gypsum was gradually prolonged. XRD, TG and FTIR analysis indicated that the hydration reaction of gypsum hemihydrate was inhibited after adding LDS. SEM observation showed that the crystal morphology of gypsum dihydrate changed from needle-like to columnar when the 1 mL 25% LDS was introduced. This study not only indicated that LDS obtained from FLW can be a new material for gypsum retardation but also provided a new way to deal with finished leather waste. Note de contenu : - EXPERIMENTAL PROCEDURES : Experimental materials - Preparation of LDS - Characteristisation of LDS - Characterisation of gypsum hydration process - Characterisation of hydrated gypsum - RESULTS AND DISCUSSION : Basic features of LDS - Analysis of hydratin process - Analysis of hydrated gypsum - Table : Basic features of LDS En ligne : https://drive.google.com/file/d/1fGzFnXVeBRes_MBdainllxzuWM_0T3CU/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37753 [article]

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