An effective way to prepare high performance biomass-based fatliquoring agent - Bromination modification of rapeseed oil and its fatliquoring and flame-retardant properties / Tao Luo in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 8 (08/2023)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVIII, N° 8 (08/2023) . - p. 346-353 Titre : An effective way to prepare high performance biomass-based fatliquoring agent - Bromination modification of rapeseed oil and its fatliquoring and flame-retardant properties Type de document : texte imprimé Auteurs : Tao Luo, Auteur ; Xu Zhang, Auteur ; Biyu Peng, Auteur ; Chunxiao Zhang, Auteur ; Sadaqat Ali Chattha, Auteur Année de publication : 2023 Article en page(s) : p. 346-353 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption Analyse sensorielle Biomasse Bromation Substitution dans une molécule d'un atome d'hydrogène par un atome de brome. Combustion 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 -- Analyse Douceur (toucher) Essais accélérés (technologie) Essais de résilience Fourier, Spectroscopie infrarouge à transformée de Huile de colza Ignifugeants Composé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface. Produits de nourriture du cuir Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : With the implementation of Carbon Neutralization strategy, it is urgently needed to develop low-carbon leather chemicals through replacing petrochemicals with biomass-based raw materials in leather industry. To solve the problems existing in the leather fatliquored by the biomass-based fatliquoring agents made from vegetable oils with high unsaturation, such as poor storability, unpleasant odor, yellowing and possible formation of hexavalent chromium, the strategy was put forward, improving the oil saturation through the double bonds addition reaction with halogen to solve the abovementioned problems resulting from the poor oxidation resistance of oil, and increase the binding ability of the oil with leather fibers and endow the leather with flame-retardant simultaneously. In this paper, the methods of modified rapeseed oil by bromine addition and its fatliquoring and flame-retardant properties were studied. The results showed that the bromine addition reaction of rapeseed oil was easy to proceed and the iodine value of the modified oil decreased almost linearly with the added amount of bromine. The binding and antioxidant properties of the oil and the physical properties of the fatliquored leather were significantly improved with the increase degree of bromination modification. Furthermore, above mentioned unpleasant odor, yellowing and hexavalent chromium formation problems were effectively solved when the iodine value of modified fatliquors was reduced to 31 g I2/100 g. Additionally, brominemodified rapeseed oil could endow leather with good flame-retardant properties and the fatliquored leather was changed from combustible to flame-retardant material with the increasing amount of bromine in the oil. The limit oxygen index (LOI) increased from 24% to 31%, the flame combustion time decreased from 127.0 s to 4.3 s, and the flameless combustion time decreased from 28.5 s to 0.0 s. This study provided an effective way to develop biomass-based and low-carbon fatliquors based on natural unsaturated oils. Note de contenu : - MATERIALS AND METHODS : Materials - Bromination modification of rapessed oil - Preparation of leather fatliquoring agent - Application of fatliquors in the fatliquoring process - Determination of the iodine value of oils - Fourier Transform Infrared Spectroscopy (FT-IR) of oils - Absorption rate of fatliquors - Distribution of Br element and collagen fibers - Binding ability of modified oils with leather fibers - Limiting oxygen index (LOI) test of crust leather - Vertical combustion test of crust leather - Ageing test of crust leather - Odor level evaluation of crust leather - Yellowing resistance property of crust leather - Softness and physical properties of crust leather - RESULTS AND DISCUSSION : Preparation and characterization of bromine-modified rapessed oil - Absorption rate of oil and its distribution in leather - Effect of rapessed oil modification degree on the properties of fatliquored leather - Table 1 : Absorption rate of fatliquors - Table 2 : Oil extraction test results - Table 3 : Leather vertical combustion test results - Table 4 : Leather softness test results DOI : https://doi.org/10.34314/jalca.v118i8.8092 En ligne : https://drive.google.com/file/d/12reqFQXSFwDRWiNVXr_pFHQVWb2biTpR/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39674 [article]

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Typical defects of natural phospholipid fatliquors in leather industry and their solutions / Zhikun Chen in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 11 (11/2021)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVI, N° 11 (11/2021) . - p. 401-410 Titre : Typical defects of natural phospholipid fatliquors in leather industry and their solutions Type de document : texte imprimé Auteurs : Zhikun Chen, Auteur ; Tao Luo, Auteur ; Xu Zhang, Auteur ; Biyu Peng, Auteur ; Chunxiao Zhang, Auteur Année de publication : 2021 Article en page(s) : p. 401-410 Note générale : Bibliogr. Langues : Américain (ame) Catégories : 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. 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 chimiques Cuirs et peaux -- Propriétés physiques Huile de soja Huiles et graisses Oxydation Phospholipides Produits chimiques -- Purification Soja et constituants Vitamine E Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leather made with soybean phospholipid fatliquors is prone to problems such as yellowing, elevated hexavalent chromium content, and undesirable odor. In this study, the aforementioned typical defects of soybean phospholipid fatliquors were investigated in respect to the main components, the antioxidants and the unsaturation degree of the natural soybean phospholipid. The results showed that the oxidation of soybean phospholipid is the primary source for its yellowing, elevated hexavalent chromium content, and undesirable odor. The volatile aldehydes produced by lipid oxidative rancidity are the main components of the undesirable odor. The purification of natural soybean phospholipid through removing the non-phospholipid components cannot solve the problems caused by oxidation of phospholipid. Furthermore, as a typical natural antioxidant existing in natural soybean phospholipid, tocopherols can restrain the oxidation of phospholipid to a certain degree, however, the dissolving out and destruction of tocopherols at high temperature in the phospholipid purification process can lead to more obviously oxidation of phospholipids. Additionally, the oxidation defects of phospholipid cannot be completely resolved by adding extra tocopherols, even at high dosages. The research finds that the defects of soybean phospholipid fatliquors can be thoroughly solved by increasing the saturation degree of lipid through addition reaction, the suggested iodine value of phospholipid products is lower than 20 g I2/100 g. Note de contenu : - MATERIALS AND METHODS : Main instruments - Experimental materials - Purification of concentrated soybean phospholipid - Preparation of modified phospholipids - Determination of AI and AS content and phospholipid characteristic indexes - Fatliquor compounding and fatliquoring process - Physical and chemical properties of the crust leather - RESULTS AND DISCUSSION : Main components and characteristics indexes of soybean phospholipids - Effect of different components on leather properties - (α)tocopherol - Effect of phospholipid saturation on leather properties - Table 1 : Odor scores of fatliquored leathers stored at room temperature for 1 week - Table 2 : Types and relative contents of volatiles in leathers - Table 3 : GC-MS detection of main volatile aldehydes - Table 4 : (α)tocopherol contents in samples - Table 5 : ΔE of modified phospholipid fatliquored leathers DOI : https://doi.org/10.34314/jalca.v116i11.4663 En ligne : https://drive.google.com/file/d/1UGkWMm5SoAQ8ViZwmOghEBys6MB0oZBV/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36578 [article]

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