Aliphatic anionic polyurethane microemulsion leather filling-retanning agent / Bao Lihong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 91, N° 2 (03-04/2007)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 91, N° 2 (03-04/2007) . - p. 73-80 Titre : Aliphatic anionic polyurethane microemulsion leather filling-retanning agent Type de document : texte imprimé Auteurs : Bao Lihong, Auteur ; Lan Yunjun, Auteur ; Shufen Zhang, Auteur Année de publication : 2007 Article en page(s) : p. 73-80 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de tannage Caractérisation Charges (matériaux) Chimie analytique Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés organoleptiques Cuirs et peaux -- Propriétés physiques Formulation (Génie chimique) Imperméabilisation Microémulsions Poids moléculaires Polymères aliphatiques Polyuréthanes Retannage Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The retanning process plays an important role in optimizing the leather’s colour, levelness, softness, fullness, and hydrophobicity. Polymer retanning agents are important materials for this process. The present study used maleic anhydride modified castor oil (MCO), PEG1000 (polyethylene glycol) and IPDI (isophorone diisocyanate) as main materials to synthesize polyurethane microemulsions (MC-PURs) and employed them to retan chrometanned leathers. The hydroxyl functionality of MCO was investigated by chemical and 1HNMR analysis, and confirmed to be about 2.0. The chemical structures of MCO, prepolymer and MC-PUR were characterized by IR. The optimized synthesis formulation and polyurethane microemulsion MC-PUR3 for MC-PURs as retanning agent was selected by comparing the properties of retanned leathers, such as softness, fullness, grain tightness, tensile strength, extension at break, depth of shade, waterproof properties et al. Then, MC-PUR3 was characterized by means of DSC, TG/DTG and TEM techniques. SEM microgram of MC-PUR3 retanned leather shows that the fibres are well dispersed. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Preparation of maleic anhydride modified castor oil (MCO) - Preparation of microemulsions of polyurethane filling retanning agents (MC-PURs) - Determination of molecular weight - H n.m.r. spectroscopy - Purification - FT-IR spectroscopy - Differential scanning spectroscopy - Thermo-gravimetric analysis - Transmission electron microscope analysis - Measurement of final dyebath exhaustion - Physical and waterproofness properties of leathers - Organoleptic properties of the final leathers - Scanning electron microscopic analysis - RESULTS AND DISCUSSION : Determination of the average molecular weight, hydroxyl number and average hydroxyl functionality (Fn(OH)) of MCO - Determination of the average hydroxyl functionality of MCO by chemical analysis - Determination of the average hydroxyl functionality of MCO by 1HNMR - Chemical structure analysis by IR - OPTIMIZATION OF RETANNING AGENT : Effect of MCO/PEG1000 mass ratio on the properties of retanned leathers - Effect of carboxyl content of MC-PUR on the properties of retanned leathers - Effect of NCO/OH molar ratio on the properties of retanned leathers - Thermal properties of MC-PUR3 - Table 1 : Basic formulations of MC-PURs - Table 2 : Filling, retanning and wet finishing processes - Table 3 : Effect of MCO/PEG1000 mass ratio on the properties of retanned leathers - Table 4 : Effect of carboxyl content of MC-PUR on the properties of retanned leathers - Table 5 : Effect of NCO/OH molar ratio on the properties of retanned leathers En ligne : https://drive.google.com/file/d/19ti2BicD3kfHFF4Z4QLX1cSWPC0J39gs/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39037 [article]

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Allium cepa peel waste : A sustainable solution for antibacterial leather dyeing with gs powder mordanting / Sathya Ramalingam in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 3 (03/2024)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 3 (03/2024) . - p. 107-118 Titre : Allium cepa peel waste : A sustainable solution for antibacterial leather dyeing with gs powder mordanting Type de document : texte imprimé Auteurs : Sathya Ramalingam, Auteur ; Swethashree Rajendran, Auteur ; Ambika Kumaresan, Auteur ; Gladstone Christopher Jayakumar, Auteur ; Alagumuthu Tamil Selvi, Auteur Année de publication : 2024 Article en page(s) : p. 107-118 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens Bacillus subtilis Caractérisation Colorants végétaux Cuirs et peaux -- Propriétés organoleptiques Cuirs et peaux -- Teinture Déchets végétaux -- Recyclage Escherichia coli Extraction (chimie) Oignons et constituants Réflectance Solidité de la couleur Stabilité thermique Taille des particules Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Using natural dyes rather than synthetic dyes is an option that can be pursued to achieve sustainability in leather dyeing. The main disadvantage of natural dyeing is poor wet and dry rub fastness and the requirements of metal mordants for fixing. In this work, onion peel waste is the chosen raw material to produce natural dye for leather dyeing without metal mordant. Adding commercial syntans and vegetable tannins with the onion peel dye in the post tanning process produces good quality dyed leather without using any mordants. The optimal particle size of eco-friendly onion peel dye was extracted from onion peel (Allium cepa) using a modified aqueous extraction method. The extracted dye was examined by various instrumental techniques to characterize the functional groups by Fourier transform infrared spectroscopy (FT-IR), optical properties by UV-VIS spectrophotometry, size by Malvern Instruments, and thermal stability by Thermogravimetric Analysis (TGA). The results express the suitability for application in the leather dyeing process. The extracted dye was analysed for the antibacterial activity towards Bacillus subtilis and Escherichia coli, and the results revealed that the natural dye has an antibacterial effect Crust leather dyed only with extracted dye showed poor dye Note de contenu : - MATERIALS AND METHODS : Sample collection - Materials and methods - Preparation and extractio of dye - Characterization of the extrated dye - Anti-bacterial activity - Leather dyeing application - Photographic images of the leather surface and cross action - Measurement of reflectance of colored leather - Fastness property of colored leather - Dye leaching analysis - Dye exhaustion studies - Organoleptic properties - RESULT AND DISCUSSION : Fourier Transformation Infrared Spectroscopy (FTIR) analysis - Thermal stability of onion peel dye - Particle size of the onion peel dye - Anti-bacterial activity - Natural dyeing with mordants - Optimisation of leather dyeing process using onion peel extract - Color coordinates measurement of dyed leathers - Color fastness measurement - The strength properties of the dyed leather - Dye leaching analysis - Orgnoaleptic properties measurement - Table 1 : Post-tanning recipe for the production of garment type of leather - Table 2 : Dyeing process mordanting with GS powder and phenolic syntan - Table 3 : Color coordinates of the dyed leather - Table 4 : Color fastness properties of the onion peel dye treated leather - Table 5 : Strength properties of the onion peel dyed leather DOI : https://doi.org/10.34314/racatm26 En ligne : https://drive.google.com/file/d/18QUv3NkhQoLrvZ1et8Gkzhh3yjwDEX9p/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40617 [article]

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Alternative tanning agent for leather industry from a sustainable source : Dialdehyde starch by periodate oxidation / Cigdem Kilicarislan Ozkan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 3 (03/2021)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVI, N° 3 (03/2021) . - p. 89-99 Titre : Alternative tanning agent for leather industry from a sustainable source : Dialdehyde starch by periodate oxidation Type de document : texte imprimé Auteurs : Cigdem Kilicarislan Ozkan, Auteur ; Hasan Ozgunay, Auteur Année de publication : 2021 Article en page(s) : p. 89-99 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agents de tannage Amidon dialdéhyde Amidons -- Oxydation Caractérisation Cuirs et peaux -- Propriétés organoleptiques Cuirs et peaux -- Propriétés physiques Poids moléculaires Tannage Tannage -- Aspect de l'environnement Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Dialdehyde starches with different aldehyde content from native corn starch were prepared by sodium periodate oxidation to be used as a tanning agent in leather making. For this purpose, native corn starch was oxidized with sodium metaperiodate in different molar ratios. After oxidation processes, the yields, solubility in water and aldehyde contents of the obtained dialdehyde starches were determined as well as structure characterizations by Proton Nuclear Magnetic Resonance Spectroscopy, Fourier Transform Infrared Spectroscopy and Gel Permeation Chromatography. Evaluating the gel permeation chromatography data, the dialdehyde starch samples which were thought to be in appropriate molecular weight/size to penetrate into skin fibers were selected to be used in the tanning process. Their tanning abilities were evaluated by investigating hydrothermal stabilities, filling and fiber isolation characteristics and physical properties determined by mechanical tests and organoleptically. From the evaluation of the results, it was revealed that sodium metaperiodate oxidized starches which have appropriate molecular weight and adequate aldehyde content has a remarkable tanning effect and can be utilized as a tanning agent with the advantages of not necessitating pickling process which means saving time and simplifying the production but more importantly offering an important advantage from an environmental point of view. Note de contenu : - Characterizations - Tanning properties of dialdehyde starch samples - Table 1 : Tanning recipe for the pelt pieces - Table 2 : Molecular weight distribution of native and oxidized starches - Table 3 : Tanning properties of oxidized starches - Table 4 : Physical properties of tanned leathers with oxidized starches - Table 5 : Organoleptical properties of tanned leathers with oxidized starches DOI : https://doi.org/10.34314/jalca.v116i3.4249 En ligne : https://drive.google.com/file/d/1Ao7z1sapfoabaz0Uek5C2uMsZkBOMAoh/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35436 [article]

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Application of nonionic gemini aliphatic polyurethane surfactant for improving the performance of vegetable tanned leather / Shuangquan Lai in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 11 (11/2019)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIV, N° 11 (11/2019) . - p. 403-412 Titre : Application of nonionic gemini aliphatic polyurethane surfactant for improving the performance of vegetable tanned leather Type de document : texte imprimé Auteurs : Shuangquan Lai, Auteur ; Yong Jin, Auteur ; Liangjie Shi, Auteur ; Shenghua Wang, Auteur ; Heng Yang, Auteur Année de publication : 2019 Article en page(s) : p. 403-412 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acide polyacrylique Agents de tannage Collagène Cuirs et peaux -- Analyse Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés organoleptiques Morphologie (matériaux) Photostabilité Polymères -- Synthèse Polymères aliphatiques Retannage Surfactants Surfactants -- Synthèse Tannage végétal Température de retrait Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Vegetable tanned leathers with good embossing, air permeability, natural look and pleasing firm handle properties have applied in many goods with multiple uses. However, the performances of vegetable tanned leathers still need a further improvement. In this work, a kind of nonionic gemini aliphatic polyurethane surfactants (GPUs) with different hydrophobic chain lengths as a retanning agent combined with polyacrylic acid (PAA) for condensed tannin tanned leathers to improve their performances. The effects of the alone or combined use of the PAA and GPU, the hydrophobic chain length of GPU, and the offer percentage of retanning agent were studied by evaluating the organoleptic properties, shrinkage temperature, mechanical properties of the obtained leathers. The best performance was found in the leather retanned with PAA and 12-GPU-550 complex retanning agent, and the mechanical properties of leather could be improved when the total offer percentage was controlled at 4 wt%. Moreover, the collagen fibers morphologies and lightfastness properties of leathers retanned with different retanning agents were investigated. The results showed that the total color difference ΔE and the yellowness index Δb decreased significantly with the introduction of 12-GPU-550, and the leather retanned with PAA and 12-GPU-550 complex retanning agent showed the lowest value of ΔE, demonstrating that the lightfastness properties were improved significantly. Therefore, it was an attractive way to combine use of PAA and 12-GPU-550 as complex retanning agent, which can improve the mechanical and lightfastness properties of vegetable tanned leathers simultaneously. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis of polyacrylic acid (PAA) - Synthesis of nonionic gemini aliphatic polyurethane surfactants (GPUs) - Application of the synthesized retanning agents - The organoleptic and physical mechanical properties of leathers - Scanning Electron Microscopy analysis of leathers - Light fastness properties of leathers - RESULTS AND DISCUSSION : Effects of different retanning agents on the properties of leathers - Effect of the hydrophobic chain length of GPU on the properties of leathers - Effect of the offer percentage of complex retanning agent on the properties of leathers - SEM analysis of leathers - Effects of retanning agents on the lightfastness properties of leathers En ligne : https://drive.google.com/file/d/1ajQdsq8W9LW8sFu6kytH1lIoq_J-RMzI/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33252 [article]

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Application of texture profile analysis (TPA) to evaluate the sensory properties of leather / Piotr Zapletal in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 3 (05-06/2016)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 100, N° 3 (05-06/2016) . - p. 127-130 Titre : Application of texture profile analysis (TPA) to evaluate the sensory properties of leather Type de document : texte imprimé Auteurs : Piotr Zapletal, Auteur ; Kaja Bierowiec-Widòrek, Auteur ; Jerzy Balejko, Auteur ; Barbara Czerniejewska-Surma, Auteur ; Dorota Maj, Auteur Année de publication : 2016 Article en page(s) : p. 127-130 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse sensorielle Cuirs et peaux -- Propriétés organoleptiques Cuirs et peaux -- Texture Cuirs et peaux de lapins Essais dynamiques Ganterie Gants Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The studies assessed grain leather texture profile to objectively and precisely define their organoreptic characteristics two groups of rabbitskin hybrids, 12 pieces each : Group 1 : Belgian Giant Gray x Burgundy (BOS x BU), Group H : Belgian Giant Gray x White New Zeeland (BOS x BNZ). Hides subjected to a dressing for gloves. The research have shown a significant correlation between features, assessed sensory and instrumental. In the case of investigational leathers elasticity were significantly correlated with fullness in touch. It also showed the relationship between the hardness measured instrumentally, and softness and toughness evaluated organoleptically. The measurement results of texture parameters show that can be objectively assess and compare features, which are usually defined by our senses such as hardness, elasticity and flexibility. Note de contenu : - FIGURES : 1. The course of rabbit leather test on the device reotest - 2. The course of the force during the two cycles of deformation and geometric parameters of the test of TPA needed to calculate texture parameters - TABLES : 1. Evaluation of the organoleptic and test parameters TPA broiler rabbitskins for leather gloves - 2. Spearman correlations between organoleptic characteristics and TPA test parameters for gloving leather En ligne : https://drive.google.com/file/d/12PeYZ5iBEi2r7jWVyZR8XC_7kRGXqIb1/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26445 [article]

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Application of Y-shaped polyurethane and polyacrylic acid as a complex retanning agent in aldehyde-tanned goat leather / Shuangquan Lai in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 11 (11/2017)  

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Augmentation of garment sheepskin type properties in goatskins : Role of chromium-silica tanning agent / N. N. Fathima in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 87, N° 6 (11-12/2003)  

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Bio-oxidation of oil tanned leathers / K. Balajyothi in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 92, N° 5 (09-10/2008)

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Biocolorant for leather dyeing applications : an eco-benign evaluation of natural coloring agent / C. Kurinjimalar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 9 (09/2021)  

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Biomass-based tanning agent for sustainable leather manufacture via cyanuric chloride modified chitooligosaccharide / Min Jiang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 10 (10/2023)  

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Chamois leathers - An approach for accelerated oxidation / Victor John Sundar in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 6 (11-12/2004)  

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Chemically modified castor oil for softening of leather - A novel approach / Bindia Sahu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 4 (04/2021)  

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A cleaner method for low-chrome tanning with no-salt pickling / Lu Cui in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 5 (09-10/2017)  

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Cleaner processing of leather and its wastes / James Kanagaraj / Saarbrücken [Germany] : Lambert Academic Publishing (2010)

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Comparative retanning performance of ecofriendly melamine resins produced using different condensing agents / Muhammad Naveed Ashraf in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 105, N° 3 (05-06/2021)  

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A comprehensive understanding on sewability of natural biomaterial : an insight on process optimization during leather manufacture / Gladstone Christopher Jayakumar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 7 (07/2021)  

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

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Development of aluminum-melamine formulation for retanning application / Murali Sathish in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 2 (02/2016)  

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Development of improved liming process based on automated pH monitoring and control system / N. Vedaraman in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 6 (06/2021)  

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Development of nano bio aldehyde tanning agent for sustainable leather manufacture / Arjunan Yasothai in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 4 (04/2023)  

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