A concept on biodegradability of fatliquors / Bindia Sahu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 5 (05/2024)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 5 (05/2024) . - p. 222-230 Titre : A concept on biodegradability of fatliquors : A sustainable and cleaner leather processing Type de document : texte imprimé Auteurs : Bindia Sahu, Auteur ; Indrasis Das, Auteur ; Akash Bhalla, Auteur ; Ravi Banothu, Auteur Année de publication : 2024 Article en page(s) : p. 222-230 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biodégradation Caractérisation Cuirs et peaux -- Propriétés organoleptiques Cuirs et peaux -- Propriétés physiques Huile de ricin et constituants Produits de nourriture du cuir Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The biodegradability of a fatliquor is an important parameter to consider in leather processing as it is critical to obtain an easily treatable waste effluent leading towards a more sustainable and cleaner environment. Fatliquor biodegradability depends upon the functional groups (double bond or hydroxyl) present in the oil after chemical modification, the level and ratio of functional groups impact the degree of biodegradability. In the present investigation, the chemical modification of castor oil was achieved via the sulfation method by varying the level of concentrated sulfuric acid H2SO4 (17 to 19 ml per 100 gm of castor oil) is tested for fatliquoring properties against a control (Turkey Red Oil). The sample treated with 17 ml concentrated H2SO4 shows better biodegradability than the other samples. The FTIR, particle size and zeta potential analysis of experimental fatliquors and morphological and physical strength (tensile strength, and elongation) characterization of the experimental leathers are comparable to the standard values. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of sulphated castor oil fatliquor with varying concentration of sulfuric acid - Characterization of fatliquor Particle size analysis of fatliquor - FTIR analysis of fatliquor - Biodegradability test of fatliquors - Fatliquor Application in post-tanning operation - Scanning Electron Microscopic (SEM) analysis - Physical strength characteristics and organoleptic properties of leather - Effect of fatliquor on the germination of Vigna radiata L. Wilcze - RESULTS AND DISCUSSION : Fatliquor particle size and zeta potential analysis - FTIR analysis of fatliquors - Biodegradability test - Effect of spent fat liquors on the germination of vigna radiata L. Wilcze and stem length of sprouts - Scanning Electron Microscopic (SEM) analysis - Physical strength characteristics and organoleptic properties of leather - - Table 1 : Nomenclature of the experimental fatliquors - Table 2 : Process recipe for fatliquoring - Table 3 : BOD/COD of different fat liquor samples - Table 4 : Sprout growth of experimental samples of Vigna radiata L. Wilcze - Table 5 : Physical properties of the leather processed by as-synthesized fatliquors DOI : https://doi.org/10.34314/9b3hbh38 En ligne : https://drive.google.com/file/d/1O7Xzg6VPgerGzmkLZInb3ybTKLxVwXVy/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40976 [article]

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Root cause analysis of color migration in footwear : A case study / Sujata Mandal in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 4 (04/2023)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVIII, N° 4 (04/2023) . - p. 150-155 Titre : Root cause analysis of color migration in footwear : A case study Type de document : texte imprimé Auteurs : Sujata Mandal, Auteur ; Ravi Banothu, Auteur ; R. Mohan, Auteur ; Kalarical Janardhanan Sreeram, Auteur Année de publication : 2023 Article en page(s) : p. 150-155 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésifs en phase solvant Caractérisation Chaussures Cuir teint Décoloration Défauts Essais (technologie) Frottements (mécanique) Produits chimiques -- Migration Solidité de la couleur Tige de la chaussure Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The phenomena of migration and/or bleeding of colorants are one of the major concerns for the footwear and leather goods industries. The migration/bleeding of the colorants from one component to the other has been observed in many cases that spoil the aesthetics of the product, which in turn leads to economic loss for the industries. In this research article, a typical case of color migration in leather footwear has been studied in depth for root-cause analysis of the migration problem. The leather used in the shoe upper (affected due to migration), the lining fabric, and the adhesive used in making the footwear were characterized by microscopic and spectroscopic techniques. The FTIR-ATR study revealed that the leather was finished with polyurethane-based coating, the lining fabric used was an aromatic polyester and the adhesive was natural rubber-based adhesive. Though the lining fabric was colorfast to rubbing, it released color in all the organic solvents generally used in natural rubber-based adhesive. Migration studies showed that migration of the colorant (black) from the lining material to the leather (white) happened only in the presence of the adhesive. In conclusion, the organic solvent present in the adhesive used in making the footwear was responsible for the color migration from the lining material to the attached leather. Finally, recommendations have also been made to avoid such problems of color migration in products made from a variety of multiple fabrics. Note de contenu : - EXPERIMENTAL : Materials - Characterization techniques - RESULTS AND DISCUSSION : Microscopic and FTIR-ATR study - Color fastness to rubbing of the lining fabric - Color migration/bleeding tests of the lining fabric - Table 1 : Values of grey cale rating for the lining and the standard cotton lawn DOI : https://doi.org/10.34314/jalca.v118i4.7205 En ligne : https://drive.google.com/file/d/1GNsWjuOMrNz-6bJkjGVZddPuLqDdKG9f/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39183 [article]

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