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Correlation analysis concerning the physical and mechanical properties of composites made of chromium leather scraps-chloroprene rubber adhesive RL-CR / Dongsheng Xin in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 107, N° 3 (05-06/2023)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 107, N° 3 (05-06/2023) . - p. 83-87 Titre : Correlation analysis concerning the physical and mechanical properties of composites made of chromium leather scraps-chloroprene rubber adhesive RL-CR Type de document : texte imprimé Auteurs : Dongsheng Xin, Auteur ; Yurui Xin, Auteur ; Yinghua Ma, Auteur Année de publication : 2023 Article en page(s) : p. 83-87 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Allongement à la rupture Assemblages collés Caoutchouc Composites -- Propriétés mécaniques Composites -- Propriétés physiques Cuirs et peaux -- Déchets -- Recyclage Eclatement (matériaux) Humidité -- Absorption:Eau -- Absorption Mouillabilité Perméabilité Polychloroprène Traction (mécanique) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this paper, the pearson product moment correlation coefficient analysis method is used to show that the tensile strength of RL/CR is highly positively correlated with the elongation at break, the bursting height is highly positively correlated with the bursting strength, the tensile strength is highly positively correlated with the bursting strength, and the bursting height is negatively correlated with the elongation at break. The air permeability of RL/CR is not correlated with 15 minutes water absorption, but is negatively correlated with 24 hours water absorption and surface wettability ; The 15 minutes water absorption of RL/CR is negatively correlated with the 24 hours water absorption and the surface wettability ; The surface wettability is positively correlated with 24 hours water absorption. The tensile strength of RL/CR is negatively correlated with air permeability, highly positively correlated with 15 minutes and 24 hours water absorption, and highly negatively correlated with surface wettability. The bursting strength of RL/CR is negatively correlated with air permeability and 15 min water absorption, and highly positively correlated with 24 hours water absorption and surface wettability. Note de contenu : - Introduction to correlation analysis of RL/CR - Theoretical basis of correlation analysis method - Experimental design of the orthogonal preparation of RL/CR and determination of its physical and mechanical properties - Calculation of correlation coefficient of physical and mechanical properties of RL/CR - Correlation analysis of physical and mechanical properties of RL/CR - Table 1 : Factors and levels of orthogonal test - Table 2 : Hot pressing process with orthogonal test - Table 3 : Mechanical properties of orthogonal test - Table 4 : Physical performance of orthogonal test - Table 5 : Correlation analysis of physical and mechanical properties of L5 - Table 6 : Correlation analysis of physical and mechanical properties of L9 - Table 7 : Correlation analysis of physical and mechanical properties of L3 - Table 8 : Correlation analysis of physical and mechanical properties of L5, L9, L3 - Table 9 : Relevance of physical and mechanical properties of RL/CR En ligne : https://drive.google.com/file/d/1Vw7-aw4Zt9ocWQM7WPhmaKQWLEg0gqAG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39577 [article]

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Progress of proficiency testing in the leather field in China / Zhiding Huang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 107, N° 3 (05-06/2023)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 107, N° 3 (05-06/2023) . - p. 88-92 Titre : Progress of proficiency testing in the leather field in China Type de document : texte imprimé Auteurs : Zhiding Huang, Auteur ; Bo Zhang, Auteur ; Bin Li, Auteur ; Rui Wang, Auteur ; Xugen Feng, Auteur ; Tianming Zuo, Auteur Année de publication : 2023 Article en page(s) : p. 88-92 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Contrôle technique Cuirs et peaux -- Industrie -- Législation -- Chine Essais (technologie) Professionnalisme Qualifications professionnelles -- Attestation Qualité -- Contrôle Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Inspection and testing plays an important role in ensuring product quality and safety and in promoting product quality improvement. Proficiency Testing (PT) is not only an effective technology of quality control for inspection and testing institutions but also an important way to evaluate the ability of inspection and testing institutions. Furthermore, it is a major means available for the supervision and management of inspection and testing institutions by regulatory authorities. The working mechanism, development process and organisation of PT is described and the shortcomings of PT in Chinaʼs leather field are studied in this paper. Finally, suggestions to promote the high-quality and sustainable development of PT in the leather field are put forward, for the purpose of providing a research basis for strengthening the supervision of the inspection and testing industry and promoting the capacity improvement of inspection and testing institutions. Note de contenu : - OVERVIEW OF PT IN THE LEATHER INDUSTRY IN CHINA : Working mechanism of PT in China - Development process of PT in leather field in China - Organisation of PT - ANALYSIS OF ISSUE : The overall situation needs to be sorted out - The organisational mode and use of PT results is inconsistent - The number of PT items are insufficient - PROPOSAL : Evaluate the overall situation - Unified specification and shared information - Strengthen R&D and service supervision - Table 1 : Differences of PT organised by AMR and PTP - Table 2 : List of PT organised by CNCA in leather field in China - Table 3 : Summary of PT organised by PTP in leather field En ligne : https://drive.google.com/file/d/1pHmXhptW5eIJrpF1C44Ec0vD4k2XotNE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39578 [article]

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Preparation of amphiphilic acrylate copolymer containing active epoxy group and its fatliquoring : Effect on aldehyde-tanned leather / Huang Yingying in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 107, N° 3 (05-06/2023)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 107, N° 3 (05-06/2023) . - p. 93-97 Titre : Preparation of amphiphilic acrylate copolymer containing active epoxy group and its fatliquoring : Effect on aldehyde-tanned leather Type de document : texte imprimé Auteurs : Huang Yingying, Auteur ; Jinxia Du, Auteur ; Xu Zhang, Auteur ; Biyu Peng, Auteur ; Chunxiao Zhang, Auteur Année de publication : 2023 Article en page(s) : p. 93-97 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Copolymère ester acrylique Copolymères -- Synthèse 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. Epoxydes Glutaraldéhyde Huiles et graisses Polymères amphiphiles Polymérisation en émulsion Produits de nourriture du cuir Résistance à la déchirure Tannage chrome free Tannage organique Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Acrylic-acrylic long-chain ester amphiphilic copolymers are a class of leather retanning and fatliquoring materials with superior properties. However, these types of copolymers lack reactive groups and possess weak binding ability to organically-tanned leather. In this paper, a terpolymer Poly(AA-LA-GMA) containing reactive epoxy groups was prepared by emulsion copolymerisation of acrylic acid (AA), dodecyl acrylate (LA) and glycidyl methacrylate (GMA) monomers. The effect of the GMA content on its binding ability to leather fibres and its fatliquoring properties was investigated. The results showed that the introduction of the epoxy group can significantly improve the combination of copolymer with glutaraldehyde-tanned leather. When the content of GMA monomer reached 10% of the total monomer amount (mol), the dichloromethane extraction rate and fogging value of the fatliquored leather were reduced by about 34% and 53%, respectively. And the excellent binding ability improved the softness and tear strength of the fatliquored leather. Note de contenu : - INTRODUCTION : Materials - Synthesis of epoxy-modified amphiphilic copolymers - Determination of the content of the residual monomer - Fourier Transform Infrared spectroscopy (FTIR) - Application of Poly(AA-LA-GMA) in the fatliquoring process - Determination of the absorption rate of fatliquor - Determination of softness and tear strength of crust leather - Determination of dichloromethane extraction rate - Determination of fogging value - RESULTS AND DISCUSSION : Preparation and characterisation of Poly(AA-LAGMA) - Fatliquoring effects of Poly(AA-LA-GMA) on chrome-tanned leather - Fatliquoring effect of Poly(AA-LA-GMA) to glutaraldehyde-tanned leather - Action mechanism between epoxy-modified amphiphilic copolymer and leather - Table 1 : Fatliquoring effects of amphiphilic copolymers to chrome-tanned leather - Table 2 : Fatliquoring effects of amphiphilic copolymers to glutaraldehyde-tanned leather - Fig. 1 : Schematic of the copolymerisation reaction - Fig. 2 : Action mechanism between epoxy-modified amphiphilic copolymer and leather En ligne : https://drive.google.com/file/d/1KByCAQkl2D1o3TmoIgqbuA3ZMjFh8hZt/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39579 [article]

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Preparation and application of a high exhaustion chrome tanning auxiliary from limed fleshings / Hongjiao Liang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 107, N° 3 (05-06/2023)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 107, N° 3 (05-06/2023) . - p. 98-105 Titre : Preparation and application of a high exhaustion chrome tanning auxiliary from limed fleshings Type de document : texte imprimé Auteurs : Hongjiao Liang, Auteur ; Jun Zhao, Auteur ; Yulu Wang, Auteur ; Jin Liqiang, Auteur ; Zhang Feifei, Auteur Année de publication : 2023 Article en page(s) : p. 98-105 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Chaulage Collagène Cuirs et peaux -- Déchets -- Recyclage Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés thermiques Cuirs et peaux de chèvres Echarnage Epuisement des tanins Hydrolysats de protéines Morphologie (matériaux) Tannage au chrome Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The recycling of leather solid waste has become a key issue aimed at realising the sustainable development of the leather industry. Recently, more and more attention has been paid on the recycling of limed fleshings. In this paper, a new recycling method for limed fleshings is reported. First, collagen protein hydrolysate (CH) was obtained by hydrolysing limed fleshings under alkaline conditions, and then the CHwas modified with cyanuric chloride (TCT) to obtain a high exhaustion chrome auxiliary (HECA). The coordination of HECA with chromium salts was investigated by ultraviolet-visible (UV-Vis) spectrum. HECA was applied in the chrome tanning process as an additive. The chrome concentration in effluent, the shrinkage temperature and mechanical properties of the resultant wet-blue were determined. Thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to analyse the properties of the obtained leather. The results show that HECA could coordinate with chromium salts and significantly improved the absorption and fixation of chrome salt into leather. When the amount of chrome tanning agent was 5% and the amount of HECA was 3%, the uptake of chrome tanning agent could be increased to 92.42%, the shrinkage temperature (Ts) of wet-blue leather could reach 102.8°C, the relative increases being 27.26% and 7.3°C, respectively, compared with the conventional tanning process. The obtained wet-blue leather demonstrated uniform grain, good fullness and improved mechanical properties. This recycling method provides a valuable insight of developing high exhaustion chrome tanning aid from limed fleshings, and consequently increases the economic and environmental benefits in leather production. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Preparation of collagen protein hydrolysate (CH) - Preparation of high exhaustion chrome auxiliary (HECA) - Coordination of HECA with chromium salt - Application of HECA in tanning process - Characterisation - RESULTS AND DISCUSSIONS : Physicochemical index of CH - Characterisation of HECA - Coordination of HECA with chromium salt - Ts and chrome uptake rate - Thermal properties and morphology of the leather - XRD analysis of wet-blue leather - Mechanical properties of leather samples - Table 1 : Tanning process of pickled goat pelts - Table 2 : Basic characteristics of CH - Table 3 : Mechanical properties of leather samples En ligne : https://drive.google.com/file/d/1DMihbpPPdVi8PEOBB1qi5aQ0eQbtKieW/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39580 [article]

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Characteristics of lightweight grain leather with improved foamability and properties using wet-foaming technology / Eun Chul Shin in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 107, N° 3 (05-06/2023)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 107, N° 3 (05-06/2023) . - p. 106-112 Titre : Characteristics of lightweight grain leather with improved foamability and properties using wet-foaming technology Type de document : texte imprimé Auteurs : Eun Chul Shin, Auteur ; Young-Woo Kim, Auteur ; Kim Joo-Young, Auteur ; Won-Ki Lee, Auteur Année de publication : 2023 Article en page(s) : p. 106-112 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents d'expansion (chimie) Cuir pleine fleur Cuirs et peaux -- Propriétés physiques Cuirs et peaux -- Teinture Fixateurs (chimie) Lignine La lignine est un des principaux composants du bois, avec la cellulose, l'hémicellulose et des matières extractibles. La lignine est présente principalement dans les plantes vasculaires et dans quelques algues. Ses principales fonctions sont d'apporter de la rigidité, une imperméabilité à l'eau et une grande résistance à la décomposition. Toutes les plantes vasculaires, ligneuses et herbacées, fabriquent de la lignine. Quantitativement, la teneur en lignine est de 3 à 5 % dans les feuilles, 5 à 20 % dans les tiges herbacées, 15 à 35 % dans les tiges ligneuses. Elle est moindre pour les plantes annuelles que pour les vivaces, elle est maximum chez les arbres. La lignine est principalement localisée entre les cellules (voir parois pectocellulosiques), mais on en trouve une quantité significative à l'intérieur même de celles-ci. Bien que la lignine soit un réseau tridimensionnel hydrophobe complexe, l'unité de base se résume essentiellement à une unité de phénylpropane. La lignine est le deuxième biopolymère renouvelable le plus abondant sur la Terre, après la cellulose, et, à elles deux, elles cumulent plus de 70 % de la biomasse totale. C'est pourquoi elle fait l'objet de recherches en vue de valorisations autres que ses utilisations actuelles en bois d'Å“uvre et en combustible. Voie de biosynthèse : La lignine est une molécule dont le précurseur est la phénylalanine. Cet acide aminé va subir une cascade de réactions faisant intervenir une dizaine de familles d'enzymes différentes afin de former des monolignols. Ces enzymes sont : phénylalanine ammonia-lyase (PAL), cinnamate 4-hydroxylase (C4H), 4-coumarate:CoA ligase (4CL), hydroxycinnamoyl-CoA shikimate/quinate hydroxycinnamoyl transferase (HCT), p-coumarate 3-hydroxylase (C3H), caffeoyl-CoA o-methyltransferase (CCoAOMT), cinnamoyl-CoA reductase (CCR), ferrulate 5-hydroxylase (F5H), caffeic acid O-methyltransferase (COMT) et cinnamyl alcohol deshydrogenase (CAD). Dans un certain nombre de cas, des aldéhydes peuvent également être incorporés dans le polymère. Moussage (chimie) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Natural leather is widely used in fashion products and has excellent physical properties owing to its structurally dense organisation. However, this high density leads to a high weight, which has been noted as a disadvantage. A fundamental method for improving the weight of natural leather materials is to reduce the weight of the naturally derived high-density collagen fibre tissue by structurally changing it into a low-density tissue. A low-density natural leather manufacturing technology is being developed to do so by infiltrating and foaming thermally expandable materials into a natural leather processing process; however, the dyeing of the fabric after foaming is uneven and the fabric becomes hard. In this study, we developed a wet-foaming process to replace the existing dry-foaming process after dyeing. The wet-foaming process is performed during the natural leather processing process (before the dyeing process) to improve the fixation and dyeability of thermo-expandable microcapsules (TEMs). By applying TEMs to the retanning process along with lignin (a natural product-based fixing agent) and then proceeding with the TEM foaming in liquid it is possible to provide stable foaming with flexibility of the TEMs in the leather tissue and to minimise the loss to drain. Furthermore, in the subsequent dyeing process, the TEMs dyed in the foamed state show an improved dyeing levelness. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Apparatus - Experimental method - Measurement of properties - RESULTS AND DISCUSSION : Wet-foaming experiments by TEMs content in the retanning process - Experiment applying lignin-based fixing agent - experiment on lignin-based agent content - Experiment on dyeability of wet-foamed grain leather - Table 1 : Characteristics of chemicals - Table 2 : Density and flexibility according to TEMs and lignin fixing agent content - Table 3 : Physical properties of wet-foaming leather En ligne : https://drive.google.com/file/d/13CISJY1kcZnr8I9DSCADGu96o4SY5aJ2/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39581 [article]

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