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Use of long-chain synthetic phenolic antioxidants to produce chromium-tanned leather without risk of hexavalent chromium formation / Irene Compte in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 10 (10/2023)
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Titre : Use of long-chain synthetic phenolic antioxidants to produce chromium-tanned leather without risk of hexavalent chromium formation Type de document : texte imprimé Auteurs : Irene Compte, Auteur ; Quim Torras, Auteur ; Francina Izquierdo, Auteur ; Rosa M. Cuadros, Auteur ; Anna Bacardit, Auteur Année de publication : 2023 Article en page(s) : p. 439-449 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antioxydants
Auto-oxydation
Cuirs et peaux de moutons
Essais accélérés (technologie)
Lipides
Phénols
Tannage au chromeIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Chromium tanned leather is the widest form of leather tanning across the world, but it might involve a risk of hexavalent chromium formation, which is restricted in leather products above 3 mg/ kg. Among other conditions, certain processes might lead to the oxidation of natural fats or fatliquoring agents with unsaturated carbon-carbon bonds, thus generating free radical molecules that can contribute to the Cr(III) oxidation to Cr(VI). The autooxidation of unsaturated lipids is promoted by exposure to high temperatures and light, specifically UV radiation. Among other relevant manufacturing practices, the addition of synthetic phenolic antioxidants (SPAs) during the synthesis of fatliquoring agents or during leather manufacturing can be a relevant tool for preventing lipid auto-oxidation.
The efficiency of the long-chain synthetic antioxidant 1135 (AO1135, CAS RN® 125643-61-0) has been assessed for Cr(VI) prevention. The performance of AO1135 has been tested in two different skin types (sheepskin, woolly sheepskin), with two different fatliquoring agents (unprotected and protected against oxidation). The protected fatliquoring agent was formulated with AO1135. Also, two commercial products that contain the AO1135 in its formulation have been applied to leathers. Upon completion of the post-tanning process, the leathers have undergone two different thermal ageing processes.
AO1135 has been verified an effective SPA for Cr(VI) prevention and its application during the post-tanning process does not alter the visual aspect of the leathers. Otherwise, if the post-tanning recipe does not contain well-sourced raw materials or Cr(VI) prevention tools, unsaturated fatliquoring agents or natural fats present in the skins can be a cause for Cr(VI) formation.Note de contenu : - INTRODUCTION : Origins of Cr(VI) in leather-hexavalent chromium containing substances - Influence of the pH value - Oxidation of fatliquoring agents - Natural extracts as a way for reducing formed Cr(VI) - Synthetic phenolic antioxidants as a tool for preventing lipid auto-oxidation - Forcing lipid auto-oxidation in leather - Determining the efficiency of antioxidant 1135 to prevent Cr(VI) formation - Commercial products with synthetic phenolic antioxidant
- EXPERIMENTAL : Design of the experiment - Samples - Chemicals and appartus - Methods - Determination of natural fat content in leather
- RESULTS : Cr(VI) content in the tanned leathers - Dispersion of the Cr(VI) content depending on the different parts of the leather
- DISCUSSION : Use of synthetic phenolic auxiliaries (AO1135) and its consequences on the Cr(VI) content - Zone of the leather and Cr(VI) distribution - Effect of different ageing treatments in Cr(VI)
- Table 1 : Structure of the study
- Table 2 : Conditions of sample exposure prior to Cr(VI) testing
- Table 3 : Cr(VI) content according to ISO 17075-2:2017 of sheep-skins produced
- Table 4 : Cr(VI) content according to ISO 17075-2:2017 of wooly sheep leathers produced
- Table 5 : Average and % RSD of leathers with Cr(VI) detectionDOI : https://doi.org/10.34314/jalca.v118i10.8232 En ligne : https://drive.google.com/file/d/1a3qDDoXd-GKDH-5gVHfu1cAh_Tje3ck8/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39942
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVIII, N° 10 (10/2023) . - p. 439-449[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24241 - Périodique Bibliothèque principale Documentaires Disponible Using DMA and UV-Vis spectroscopy to predict the performance of wood coatings in outdoor use / F. Bulian in SURFACE COATINGS INTERNATIONAL, Vol. 94, N° 5 (10/2011)
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Titre : Using DMA and UV-Vis spectroscopy to predict the performance of wood coatings in outdoor use Type de document : texte imprimé Auteurs : F. Bulian, Auteur ; A. Matellon, Auteur ; A. Melchior, Auteur ; D. Menotti, Auteur ; M. Tolazzi, Auteur ; A. Spagna, Auteur ; M. Tanelli, Auteur Année de publication : 2011 Article en page(s) : p. 177-180 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse mécanique dynamique
Analyse spectrale
Applications extérieures
Bois -- Revêtements protecteurs
Durée de vie (Ingénierie)
Essais accélérés (technologie)
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : Organic coatings are widely used in order to protect wood from degradation, in particular in outdoor applications. Wood degradation involves a number of complex reactions promoted by the interaction of wood with external factors such as oxygen, solar radiation, water, pollutants etc. Note de contenu : - Research directions and problems : The value of accelerated testing
- Experimental procedures : Materials and sample preparation - Weathering - DMA characterisation - UV-Vis spectroscopy
- Table 1 : Products and their durability
- Table 2 : Visco-elastic parameters before and after the weathering test
- Fig. 1 : Samples after one year of natural exposure : Standard trial EN-927-3 and trial with water trap
- Fig. 2 : Variation in Tg during weathering trial
- Fig. 3 : UV-Vis transmission spectra of coating samples at different stages in the weathering testEn ligne : https://drive.google.com/file/d/1npi8CzY-GjAbf2FUZ2Ew5XBO1QyUYZHo/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37318
in SURFACE COATINGS INTERNATIONAL > Vol. 94, N° 5 (10/2011) . - p. 177-180[article]UV protection against photoageing of garment leathers by ZnO nanoparticles : application of nano ZnO in finishing process as photocatalyst / Bekir Yilmaz in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 6 (11-12/2016)
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Titre : UV protection against photoageing of garment leathers by ZnO nanoparticles : application of nano ZnO in finishing process as photocatalyst Type de document : texte imprimé Auteurs : Bekir Yilmaz, Auteur ; Ersin Onem, Auteur ; Ali Yorgancioglu, Auteur ; Eser Eke Bayramoglu, Auteur Année de publication : 2016 Article en page(s) : p. 321-326 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse de variance En statistique, l'analyse de la variance (terme souvent abrégé par le terme anglais ANOVA : ANalysis Of VAriance) est un ensemble de modèles statistiques utilisés pour vérifier si les moyennes des groupes proviennent d'une même population. Les groupes correspondent aux modalités d'une variable qualitative (p. ex. variable : traitement; modalités : programme d'entrainement sportif, suppléments alimentaires ; placebo) et les moyennes sont calculés à partir d'une variable continue (p. ex. gain musculaire).
Ce test s'applique lorsque l'on mesure une ou plusieurs variables explicatives catégorielles (appelées alors facteurs de variabilité, leurs différentes modalités étant parfois appelées "niveaux") qui ont de l'influence sur la loi d'une variable continue à expliquer. On parle d'analyse à un facteur lorsque l'analyse porte sur un modèle décrit par un seul facteur de variabilité, d'analyse à deux facteurs ou d'analyse multifactorielle sinon. (Wikipedia)
Cuir -- Teneur en chrome hexavalent
Cuirs et peaux -- Analyse
Cuirs et peaux -- Finition
Duncan, Test de
Essais accélérés (technologie)
Nanoparticules
Oxyde de zinc
Photocatalyse
Spectrophotométrie
StatistiqueIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this study, zinc oxide nano-particles, known to have photocatalytic and high UV protection properties, were used in the finishing process to prevent chromium(VI) formation as a result of photoageing in the garment leather products. The researches were carried out on the chrome-tanned garment leather. Nano zinc oxide at the proportions of 0.25%, 0.5% and 1% on nitrocellulose (N/C) emulsion amount were used in the finishing process of leathers. The finished garment leathers were exposed to an artificially accelerated ageing process at 80°C for 24 hours and 80°C/UV for 24 hours. Cr(VI) amounts in each leather sample were evaluated in compliance with ISO/FDIS 17075 standard test method based on the reaction of chromium(VI) with diphenylcarbazide and subsequent colorimetric determination at 540nm by using a double beam Shimadzu 1601 UV visible region spectrophotometer. The leathers finished using nano ZnO were compared to control samples and the way in which ZnO nanoparticles affect Cr(VI) formation was statistically examined by the analysis of variance (ANOVA) and Duncan test. According to research results, it was determined that Cr(Vl) amounts arising in the garment leathers after photoageing were rather high and that the use of nano zinc oxide in finishing process substantially eliminated Cr(VI) formation statistically by providing high UV protection. 18,31 ± 2.46ppm of Cr(Vl) occured under 80°C/UV for 24 hours was decreased to less than 3ppm by 1% of nano ZnO. Using 0.25% and 0.5% of nano ZnO on the amount of N/C emulsion applied also reduced the levels of Cr(VI) to under 3ppm. Note de contenu : - Materials
- Finishing process
- Accelerated ageing treatment
- Chromium(VI) analysis in leather samples
- Statistical analysisEn ligne : https://drive.google.com/file/d/1qbW5iXWrsAc8w1-UC2R8g8eRvnV1dGRe/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27668
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 100, N° 6 (11-12/2016) . - p. 321-326[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18546 - Périodique Bibliothèque principale Documentaires Disponible UV-stable electrocoats for corrosion protection and structural bonding in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 6 (11/2019)
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Titre : UV-stable electrocoats for corrosion protection and structural bonding Type de document : texte imprimé Année de publication : 2019 Article en page(s) : p. 1609-1618 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs
Anticorrosion
Colles:Adhésifs
Essais accélérés (technologie)
Essais d'adhésion
Pulvérisation cathodique
Résistance au cisaillement
Résistance aux conditions climatiques
Revêtements:Peinture
Spectroscopie d'impédance électrochimiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : The coating process in the industry segment of mobile machinery for ACE, e.g., agricultural machines, is usually done by spray application after welding a variety of parts on the framework. The current painting process consists of an anticorrosive primer and a weather-resistant topcoat. The presented study is part of a research project investigating a new concept combining a new sequence in construction with the big advantage of applying a single-coat system. This smart production enables the construction of machines in modules, keeps the volume of an electrocoating dipping bath at a minimum level, and replaces the custom painting procedure with much overspray by an economic and ecological coating technology. To realize this new technology, the coating system has to perform as an anticorrosive system, providing a sufficient outdoor weather resistance, and must have sufficient adhesion strength for structural bonding of additional parts. First results show that the investigated electrocoats show good anticorrosive properties. The UV- and the weather resistance meet the required values (> 50% gloss retention after 1000 h artificial weathering of CAM 180), dependent on the type of electrocoat. First investigations on structural bonding show that a high bonding strength can be achieved. Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS : Substrate materials - Pretreatment processes - Adhesives - Cathodic electrodeposition paint - Adhesion test - Corrosion tests - Cyclic corrosion test - Artificial weathering - Electrochemical impedance spectroscopy (EIS) - Tensile shear strength DOI : 10.1007/s11998-019-00266-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00266-7.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33413
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Code-barres Cote Support Localisation Section Disponibilité 21321 - Périodique Bibliothèque principale Documentaires Disponible Le veillissement artificiel en chaussure et en maroquinerie / B. Michel in TECHNICUIR, N° 3 (03/1981)
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Titre : Le veillissement artificiel en chaussure et en maroquinerie Type de document : texte imprimé Auteurs : B. Michel, Auteur Année de publication : 1981 Article en page(s) : p. 45-48 Langues : Français (fre) Catégories : Chaussures
Cuirs et peaux -- Détérioration
Essais accélérés (technologie)
MaroquinerieTags : Maroquinerie Chaussure Matériaux Vieillissement Défaut Contrôle Vitesse Matériel Index. décimale : 685.3 Chaussures Résumé : Un essai préventif de vieillissement réalisé artificiellement, soit sur des échantillons des matériaux utilisés, soit sur les articles finis, présenterait un intérêt évident en maroquinerie et chaussure, et éviterait certains déboires. C'est ce que montre l'auteur, en donnant des conseils pratiques relatifs, d'une part à la réalisation des essais, d'autre part au choix du matériel à acquérir, représentant somme toute un investissement très modeste. Note de contenu : - EXEMPLES D’ALTÉRATIONS DANS LE TEMPS : Décollage - Finissage de cuirs dégradés par du PVC - Transferts de colorants - Mauvaise tenue à la lumière
- EN QUOI CONSISTE LE VIEILLISSEMENT ARTIFICIEL ?
- DE QUEL MATÉRIEL A-T-ON BESOIN ?
- COMMENT PROCÉDER ?En ligne : https://drive.google.com/file/d/1VmpZZ2dOqybAKy3oMjCoZWCLjZpXX7zK/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23378
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Code-barres Cote Support Localisation Section Disponibilité 009156 - Périodique Bibliothèque principale Documentaires Disponible Watch out for corrosion testing / Heike Schuster in INTERNATIONAL SURFACE TECHNOLOGY (IST), Vol. 15, N° 1 (2022)
PermalinkWater absorption of water-based anticorrosive coatings and its effect on mechanical property and adhesive performance / Takuya Kamisho ; Yukitoshi Takeshita ; Seizo Sakata ; Takashi Sawada in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 2 (03/2014)
PermalinkWater-based system to prevent the yellowing of opaque coatings on knotted pine wood / Rodrigo Coniglio ; Wolfgang Gaschler ; Leonardo Clavijo in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)
PermalinkWater concentration distribution in coatings during accelerated weathering protocols / Brian R. Hinderliter in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 3 (05/2015)
PermalinkWater on wood / Felix Baah in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 195, N° 4484 (01/2005)
PermalinkWater vapor transmission properties of acrylic organic coatings / Réka Lilla Kovács in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 2 (03/2021)
PermalinkWeather fastness tests for surface coated materials and their evaluation methods / M. M. Gondkar in PAINTINDIA, Vol. LVI, N° 1 (01/2006)
PermalinkWeather testing of paints and coatings in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 202, N° 4576 (09/2012)
PermalinkWeathering testing of wind turbine rotor blade coatings / Florian Feil in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 204, N° 4595 (04/2014)
PermalinkPermalinkWhat security is offered in practice by standardised test procedures ? / Hans-Jürgen Alfort in INTERNATIONAL SURFACE TECHNOLOGY (IST), Vol. 10, N° 3 (2017)
PermalinkWhen time is your enemy / Allen Zielnik in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 202, N° 4571 (04/2012)
PermalinkWhich materials meet the requirements ? / Gerhard Hautmann in ADHESION - ADHESIVES + SEALANTS, N° 9/2007 (09/2007)
PermalinkPermalinkZinc-rich primer and UHP waterjetting in severe marine environments / Philippe Le Calvé in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 34, N° 3 (03/2017)
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