Application of some plant extracts as biocolorants for leather during finishing process / Roza Mirzamuratova in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 1 (01/2024)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 1 (01/2024) . - p. 3-12 Titre : Application of some plant extracts as biocolorants for leather during finishing process Type de document : texte imprimé Auteurs : Roza Mirzamuratova, Auteur ; Eser Eke Bayramoglu, Auteur ; Rashid Kaldybayev, Auteur Année de publication : 2024 Article en page(s) : p. 3-12 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Colorants végétaux Colorimétrie 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 -- Finition Cuirs et peaux -- Teinture Cuirs et peaux de bovins Essais dynamiques Extraits de plantes Résistance à l'abrasion Solidité de la couleur Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this research, chrome-tanned bovine crust leathers were dyed during the finishing process using plant extracts: walnut shell (Juglans regia), oak bark (Quercus cortex), and onion peel (Allium cepa). In this study, the standard recipe applied by the factory was used in the leather finishing process. For this recipe, various plant extracts were used instead of pigments, and groups that did not contain pigment and any dyestuff were formed as the control groups. After these processes, color measurement analyzes were performed on Konica Minolta CM 3600d spectrophotometer. In order to investigate the effects of walnut shell (Juglans regia), oak bark (Quercus cortex), and onion peel (Allium cepa) on the other performance properties of leather, dry and wet rub fastness test according to standard method TS EN ISO 11640 (2001) was performed. The results of the study were statistically evaluated using the NCSS method (Number Cruncher Statistical System). As a result of the study, it was noticed that, depending on the extract, different colors were obtained. It was found that the dry and wet fastness of leathers treated with plant extracts improved. Note de contenu : - EXPERIMENTS : Materials and methods - Color measurement tests of leather samples - Dry and wet rubbing fastness analyses - Statistical evaluation of reseults - RESULTS AND DISCUSSION : Results of the appearance of leather - Dry and wet rubbing fasntess results - Color measurement analysis results - Table 1 : pH value of extracts and chemical pigment - Table 2 : Finsihing recipe used in application - Table 3 : Color measurement test results - Table 4 : Color measurement test results after aging process (24 hours) - Table 5 : Color measurement test results after ageing process (96 hours) - Table 6 : Dry rub fastness test results - Table 7 : Evaluation of dry rub fastness test results - Table 8 : Wet rub fastness test results - Table 9 : Evaluation of wet fastness test results - Table 10 : Evaluation results of color measurements - Table 11 : Evaluation results of color measurements after aging process (24 hours) DOI : https://doi.org/10.34314/jalca.v119i1.8289 En ligne : https://drive.google.com/file/d/1Yf9u2l4ShoE5wPc4K2j_s_8v8mMvVoh_/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40344 [article]

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Reduction of Cr (VI) formation in leather with herbal extracts / Roza Mirzamuratova in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 2 (02/2024)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 2 (02/2024) . - p. 71-79 Titre : Reduction of Cr (VI) formation in leather with herbal extracts Type de document : texte imprimé Auteurs : Roza Mirzamuratova, Auteur ; Eser Eke Bayramoglu, Auteur ; Gulzinat Yeldiyar, Auteur Année de publication : 2024 Article en page(s) : p. 71-79 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuir -- Teneur en chrome hexavalent Cuirs et peaux -- Analyse Cuirs et peaux -- Finition Essais accélérés (technologie) Extraction (chimie) Extraits de plantes Réduction (chimie) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : This study investigates the effects of extracts from natural products such as oak bark, and onion peel, on the formation of Hexavalent Chromium (chromium (VI)) or (Cr (VI)) in leather during the finishing process. To enable chromium (VI) formation, finished leather samples were aged under various conditions, including exposure to UV light. The amount of chromium (VI) in each leather sample was measured using a PC UV-Visible spectrophotometer at 540 nm based on the ISO/FDIS 17075 standard method. The results showed that extracts from Quercus cortex, and Allium cepa significantly reduced chromium (VI) formation in the leather under all aging conditions. Note de contenu : - Materials and methods : Extraction process - Processes with plant extracts - Aging process - Chromium (VI) analysis on leather samples - Statistical evaluation - Table 1 : The recipe for leathers - Table 2 : The plants used in the study and picking regions - Table 3 : Recipe for finishing process - Table 4 : Chromium (VI) content of leather samples after aging process (80°C, 24h) - Table 5 : Evaluation of chromium (VI) analysis measurements (80°C, 24h) - Table 6 : Chromium (VI) content of leather samples after aging process by UV(80°C/UV, 24h) - Table 7 : Evaluation of chromium (VI) analysis measurements(80 °C/UV, 24h) - Table 8 : Chromium(VI) content of leather samples after aging process (80°C/UV, 72h) - Table 9 : Evaluation of chromium (VI) analysis measurements(80°C/UV, 72h) DOI : https://doi.org/10.34314/jalca.v119i2.8324 En ligne : https://drive.google.com/file/d/1hABHJ7JxIDEPPuXBNoG8y3q9F8qLZZWz/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40467 [article]

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