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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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Evaluation of the physical properties of goatskins tanned using banana (Musa spp.) leaf midrib tannins / James K. Wangui 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. 13-19 Titre : Evaluation of the physical properties of goatskins tanned using banana (Musa spp.) leaf midrib tannins Type de document : texte imprimé Auteurs : James K. Wangui, Auteur ; Benson Ongorora, Auteur ; Douglas Onyancha, Auteur Année de publication : 2024 Article en page(s) : p. 13-19 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bananier et constituants Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés physiques Cuirs et peaux de chèvres Mimosa et constituants Tannage végétal Température de retrait Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Vegetable tannins have been studied over the years with an aim to reduce the pollution load caused by chrome tanning. Although mimosa tannins have been utilized commercially, they are expensive and not readily available. The purpose of this study was to assess the physical properties of leather tanned with banana leaf midribs tannins in order to determine their suitability as vegetable tannins. Selected banana leaf midrib samples were collected from Gikondi village in Mukurweini, Nyeri County, Kenya. They were shade-dried and ground into powder. The skins were processed conventionally using banana leaf midribs tannins of Musa sapientum Linn. and ‘Muraru’ (AA genome), with mimosa as a control. The physical properties of the resultant leathers were determined following the standard IUP methods. It was found that Musa sapenitum Linn, ‘Muraru’ (AA genome) and mimosa-tanned leathers had average shrinkage temperatures of 80.33 ± 0.74°C, 78.67 ± 0.47°C and 81.67 ± 0.94°C, respectively. The properties of the tanned leathers were compared with those of the control-tanned leather. Assessment of the physical properties indicated that the leathers met the minimum recommended values safe for Musa sapentium Linn-tanned leather, which failed at 30,000 flexes. These results indicate that banana leaf midribs can be used as an organic tanning agent source for production of leathers from goatskins. Note de contenu : - EXPERIMENTAL : Materials - Tanning process - PHYSICAL TESTING : Sampling and sample preparation- Determination of shrinkage temperature - Mechanical analysis of the tanned leathers - RESULTS AND DISCUSSION : Tanning - Physical properties of the tanned leathers - Shrinkage temperature - Tensile strength - Tear strength - Table 1 : Process recipe for Mimosa tanning - Table 2 : Process recipe for banana leaf midrib tanning - Table 3 : Physical properties of selected banana leaf midrib tanned leathers and mimosa tanned leather - Grain crack and ball burst - Flexing endurance DOI : https://doi.org/10.34314/jalca.v119i1.8290 En ligne : https://drive.google.com/file/d/1CRhkpRovl3M5V4rZjc83y9rKE9FjEEaH/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40345 [article]

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Effect of pigment-acrylic binder ratio on the surface and physical properties of resin finished leather / Suriya Madhan 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. 20-30 Titre : Effect of pigment-acrylic binder ratio on the surface and physical properties of resin finished leather Type de document : texte imprimé Auteurs : Suriya Madhan, Auteur ; Mishamo Wakaso, Auteur ; Sathya Ramalingam, Auteur ; Swarna Vinodh Kanth, Auteur Année de publication : 2024 Article en page(s) : p. 20-30 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésion Angle de contact Cuirs et peaux -- Finition Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés organoleptiques Cuirs et peaux -- Propriétés physiques Formulation (Génie chimique) Liants Polyacryliques Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The current study attempts to investigate the surface phenomenon and physical characteristics of leather finished with brown pigment and different types of acrylic binders. Using the contact angle measurements of three different liquids on the above finished leathers and films, the surface energy and work of adhesion were evaluated. The pigment to acrylic binder ratio (PABR) for best adhesion of finish film on the leather surface was optimized using the contact angle goniometer. Different types of acrylic binder films were coated and their surface behaviour was studied. The crust leather was coated with different types of pigment-acrylic binder (Very Soft, Soft and Medium Soft) finish formulations. The contact angle of both the acrylic films and the PABR finished leathers were measured against Water, Dimethyl sulfoxide (DMSO) and Hexadecane (HD). According to the study’s results, the surface properties of finished leather were directly related to the degree of wetting. The PABR was found to be effective at 1:3 for very soft binder, 1:2.5 for soft, 1:2 for medium soft binders due to higher contact angle and lower surface energy values (γsv). At 1:3 and 1:2.5, the contact angle of very soft and soft binder leather was 82.62° and 83.45° and for medium soft binder it was 82.67° at 1:2 ratio. The surface energy values of optimized PABR of very soft binder (1:3) was 28.29 (mN/M), soft binder (1:2.5) was 27.50 (mN/m) and medium soft binder (1:2) was 29.27 (mN/m). The optimized PABR work of adhesion values of very soft binder, soft binder and medium soft binder was 82.15 (mJm-2), 81.11 (mJm-2), 82.09 (mJm-2). In order to correlate the observed surface properties with leather finish properties, finished leathers were tested for finish adhesion, vamp flexing value, water vapour permeability, wet and dry rub fastness. According to the water vapour permeability, soft and medium binder showed good permeation due to the uncovering of nanopores. But the adhesion, grain crack resistance and grain smoothness were higher in the case of the soft binder. Overall leather properties divulges that the pigment to binder ratio and the type of binder plays an important role in surface properties of the finished leather. This study enables us to determine the optimal PABR for effective finish properties to meet the required leather standards for various usage, as well as better utilisation of finishing chemicals. Note de contenu : - MATERIALS AND METHOD : Materials - method : Finish formulation preparation - Finished upper leather preparation - Acrylic binder film preparation - Determination of contact angle - Measurement of work of adhesion - Measurement of adhesion of finish - Determination of flexing endurance - Determination of wet and dry rub fastness - Determination of water-vapor permeability - Determination of physical strength characteristics - Determination of organoleptic properties - RESULTS AND DISCUSSION : Contact angle and surface energy and work of adhesion parameters of different acrylic binder films - Correlation between surface energy and work of adhesion parameters for various PABR of very soft binder - Correlation between surface energy and work of adhesion parameters for various PABR of soft binder - Correlation between surface energy and work of adhesion parameters for various PABR of medium soft binder - Water vapor permeability - Finish adhesion properties of finished leather - Organoleptic properties analysis - Table 1 : Characteristics of the binder chosen for finishing application - Table 2 : Finish formulations prepared at a varied concentration of different acrylic binder - Table 3 : Contact angle and surface energy and work of adhesion value for binder coated on a microscopic slide - Table 4 : Contact angle and surface energy and work of adhesion values for vaious PABR of very soft binder - Table 5 : Contact angle and surface energy and work of adhesion values for various PABR of soft binder - Table 6 : Contact angle and surface energy and work of adhesion values for various PABR of medium soft binder - Table 7 : Adhesion properties of optimum PABR of various binder - Table 8 : Organoleptic properties of optimum PABR of various binder DOI : https://doi.org/10.34314/jalca.v119i1.8291 En ligne : https://drive.google.com/file/d/1W93p1wv9mAcBRQf17cZQViw7-2kk6Jpb/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40346 [article]

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Super robust, anti-bacterial polyurethane ionogel with high sensitivity and hydrophobicity / Wei Wang 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. 31-40 Titre : Super robust, anti-bacterial polyurethane ionogel with high sensitivity and hydrophobicity Type de document : texte imprimé Auteurs : Wei Wang, Auteur ; Shiyang Yan, Auteur ; Yihong Zhao, Auteur ; Hao Liu, Auteur ; Luming Yang, Auteur ; Biyu Peng, Auteur Année de publication : 2024 Article en page(s) : p. 31-40 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens Capteurs de contraintes Caractérisation Cuirs et peaux -- Conservation gels ioniques Un gel ionique (ou Ionogel ) est un matériau composite constitué d'un liquide ionique immobilisé par une matrice inorganique ou polymère. Le matériau a la qualité de maintenir une conductivité ionique élevée à l'état solide. Pour créer un gel ionique, la matrice solide est mélangée ou synthétisée in situ avec un liquide ionique. Une pratique courante consiste à utiliser un copolymère séquencé qui est polymérisé en solution avec un liquide ionique afin de générer une nanostructure auto-assemblée où les ions sont sélectivement solubles. Les gels ioniques peuvent également être fabriqués à partir de polymères non copolymères tels que la cellulose, d'oxydes tels que le dioxyde de silicium ou de matériaux réfractaires tels que le nitrure de bore. (Wikipedia) Hydrophobie Polyuréthanes Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Ionogel based on ionic liquids plays a vital role in wearable electronic devices. In this study, a robust and anti-bacterial ionogel with high sensitivity and hydrophobicity is synthesized by adding 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide to thermoplastic polyurethanes at a ratio of 1:1. The ionogel not only demonstrates tensile strength of 23.1 MPa and elongation at break of 1008%, but also exhibits excellent fatigue resistance with low residual strain (8%) and small hysteresis loop. Ionic liquid makes the ionogel have high-temperature stability (T5% near 300°C) and low Tg (-63.3°C). Due to the anti-bacterial property of ionic liquid, the ionogel formed by ionic liquid has anti-bacterial property, with up to 99% inhibition against E. coli and S. aureus. The sensor prepared with the ionogel shows a Gauge Factor of 1.8, with a short response time (128 ms) and a stable induction signal under water and at low temperature. Due to those performance characteristics, we believe that the study could provide insights for subsequent research on ionogel-based wearable electronic devices, for instance, the development of electronic skin in the leather industry. Note de contenu : - EXPERIMENTAL : Materials - Preparation of TPU/IL ionogel - Characterization - RESULTS AND DISCUSSIONS : Preparation and structure of the ionogels - Stretchability of the ionogels - Environmental stability of the ionogels - Anti-bacterial property of the ionogels - The ionogels as strain sensor - The ionogel as human skin sensor DOI : https://doi.org/10.34314/jalca.v119i1.8293 En ligne : https://drive.google.com/file/d/16BZB7P5x1_NxWJWcP0QaXhlnZweuMAYb/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40347 [article]

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