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Novel acrylic particle technology for high performance leather finishing / J. Hoefler in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 11 (11/2011)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 11 (11/2011) . - p. 316-325 Titre : Novel acrylic particle technology for high performance leather finishing Type de document : texte imprimé Auteurs : J. Hoefler, Auteur ; C. J. Chung, Auteur ; B. Hageman, Auteur ; E. LaFleur, Auteur Année de publication : 2011 Article en page(s) : p. 316-325 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Finition Polyacryliques Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The Dow Chemical Company has developed a novel acrylic technology for use in leather finishing formulations. Products making use of this unique technology can deliver low gloss finishes with high optical clarity, soft-touch aesthetics and high physical performance. The key enabler in this technology is an acrylic particle that offers comparable gloss, “jetness” and performance properties to many commercially available inorganic and organic dulling materials. The technology is inherently solvent free, and is compatible with existing acrylic and polyurethane resin components as well as conventional cross-linking chemistries. Note de contenu : - Summary of the new acrylic topcoat technology - EXPERIMENTAL : Comparing organic particles - Finish - Formulation and crust preparation - Appearance - Flexibility - Wear performance - RESULTS AND DISCUSSION : Flexibility - Wear - Resistance En ligne : https://drive.google.com/file/d/1eU-PmphSlyLbPl8c09qiRC1V1ukxF5uS/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12520 [article]

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Airborne ultrasonic inspection for hides and leather / Cheng-Kung Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 11 (11/2011)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 11 (11/2011) . - p. 326-331 Titre : Airborne ultrasonic inspection for hides and leather Type de document : texte imprimé Auteurs : Cheng-Kung Liu, Auteur ; Nicholas P. Latona, Auteur Année de publication : 2011 Article en page(s) : p. 326-331 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Analyse Ultrasons Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Currently, hides and leather are visually inspected and ranked for quality, sale price and usable area. Visual inspection is not always reliable for detecting defects, particularly when they are hidden inside the material. This manual assessment is non-uniform among operators, and often leads to disputes over fair price. Development of a nondestructive method to accurately evaluate the quality of hides and leather is needed. We have investigated airborne ultrasonic (AU) testing using non-contact sensors for the nondestructive evaluation of hides and leather. The AU test system is an ideal inspection method for large hides or leather and is designed for automated and moving process applications. The AU sensors are mounted on a computer-controlled X-Y scanner that allows the sensor array to be moved over the entire surface of the hide. The AU testing involves pulsing ultrasonic signals and measuring the amplitude of those signals that traveled through the material. This research examines the ability of AU techniques to reveal defects in hides and leather that are difficult to be found during visual inspection. The key for success in AU testing is to use AU sensors with low resonant frequencies, which leads an effective penetration of waves through the leather or hides. Observation showed that test areas with different amplitudes in the C-scans obtained from AU testing is an indication of the presence of defects or some other physical discontinuity that could affect the hides or leather quality. Using the AU C-scan images could advance the industry in how it assesses and grades raw hides, wet blue, wet white and finished leather. En ligne : https://drive.google.com/file/d/1BquSlyIjzaWHuc88F6j3ntdcfs2jLJLx/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12521 [article]

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Application of collagen colloid from chrome shavings for innovative polycondensation adhesives / Ján Sedliacik in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 11 (11/2011)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 11 (11/2011) . - p. 332-340 Titre : Application of collagen colloid from chrome shavings for innovative polycondensation adhesives Type de document : texte imprimé Auteurs : Ján Sedliacik, Auteur ; Ján Matyasovsky, Auteur ; Maria Smidriakov, Auteur ; Mariana Sedliacikovà, Auteur ; Peter Jurkovic, Auteur Année de publication : 2011 Article en page(s) : p. 332-340 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bois -- Collage Chrome Collagène Colloides Cuirs et peaux -- Déchets -- Recyclage Hydrolysats de protéines Polycondensation Tags : Adhésifs  'Résine  polycondensation'  'Collage  bois'  'Déchromage  cuir'  'Déchets  Colloides  'Hydrolisat  collagène  'Détermination  formaldéhyde  FTIR  ATR  'Résistance  cisaillement  joints  collés'  'Action  eau'  'Conditions  humides' Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : This research was aimed at determining the possible usefulness (ecologic, efficiency, and economic) of collagen material, after de-chroming, to modify polycondensation adhesives for application in the woodworking industry. The de-chroming technology of leather chromium waste was proposed in our previous work.1 In this work, condensation adhesives based on urea-formaldehyde and phenol-formaldehyde were modified with protein hydrolysates. It is known that collagen hydrolysate of chrome-tanned leather waste added to dimethylol urea clearly limits formation of relatively unstable oxy-methylene bridges which may be regarded as potential source of formaldehyde emissions. The aim of this study was to verify the change of glue joint properties in following ways: influence of collagen hydrolysate on shear strength properties of glued joints under action of water and high humid conditions; increasing the water-resistance of glued materials, development of adhesive mixtures suitable for gluing of wood at higher moisture content, influence of collagen hydrolysate on lowering the formaldehyde emissions from wood based panels. The intended sources of protein hydrolysates were solid waste from leather production (e.g. chromium shavings and chippings, hypodermic and adipose ligament, leather chippings, gelatin production and food packing). These various analytical investigations of this study confirmed significant reduction of formaldehyde emission from wood based panels, increased water-resistance of glued materials, and conforming shear strength properties of glued joints. Application of collagen from de-chromed waste allows improvement of ecologic and economic parameters of bonding processes in the woodworking industry (e.g. eliminating of harmful effects on the environment and lowering of costs at keeping required quality). Note de contenu : - EXPERIMENTAL : Polycondensation resins - Preparation of collagen hydrolysate - Plywood preparation - RESULTS AND DISCUSSION : Chemical properties of UF + collagen adhesive mixtures - Shear strength of plywood samples - Formaldehyde determination by perforator and chamber method - ATR-FTIR spectral analysis - Application of leather dust as extender En ligne : https://drive.google.com/file/d/1orj9SP3Xy1MEeOjS70gfAd3FJRAgsxDS/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12522 [article]

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Determination of TCMTB and other fungicides in leather / Joaquim Font in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 11 (11/2011)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 11 (11/2011) . - p. 341-348 Titre : Determination of TCMTB and other fungicides in leather Type de document : texte imprimé Auteurs : Joaquim Font, Auteur ; M. Reyes, Auteur ; Sara Cuadros, Auteur ; Anna Bacardit, Auteur ; Agusti Marsal, Auteur Année de publication : 2011 Article en page(s) : p. 341-348 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antifongiques Cuir Thiocyano-méthylthiobenzotiazole Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The new ISO 13365:2011 develops a test method for the determination of the content of the preservative agents 2-(thiocyanomethylthio)-benzothiazole (TCMTB), 4-chloro-3-methylphenol (PCMC), 2-phenylphenol (OPP) and 2-Octyl-3(2H)-isothiazolone (OIT) in leather by liquid chromatography. The simultaneous determination of the fungicides TCMTB, PCMC, OPP, OIT, and also 2-mercaptobenzothiazol (MBT) and 3-iodo-2-propynyl-butylcarbamate (IPBC) in leather samples was carried out by liquid chromatography (HPLC) with diode array ultraviolet detection. The sample preparation and extraction step was performed following the new ISO 13365 Standard. The mobile phase was 0.1% formic acid in water (A) : 0.1% formic acid in acetonitrile (B). Gradient: 60% B, 6 min isocratic, then linear to 95% B in 9 min. The chromatographic detection introduced only a minor change with respect to the Standard: a photo diode array detector was used instead of a single wavelength ultraviolet one, thereby improving the reliability of the identifications and the sensitivity of the quantification. It has been ensured that 2,4,6-trichlorophenol (TCP) and pentachlorophenol (PCP) not interfere in the determination. The leather fortifications of 30 and 300 mg/kg yielded average TCMTB recoveries of 94% and 99%, respectively. The recoveries of the other fungicides were similar. The targeted fungicides were determined in 40 samples of commercial leather. Residues of TCMTB were found in 90% of samples. In summary, the new ISO 13365:2011 Standard provides a quick and reliable method not only for the determination of the four molecules that are within the scope of the Standard but also for other fungicides such as IPBC and MBT. Note de contenu : - EXPERIMENTAL : Instrumentation - Materials - Samples - Procedures - RESULTS AND DISCUSSION : Limits of detection and quantification - Linearity, recovery and precision - Selection of wavelength of detection - Analysis of commercial samples En ligne : https://drive.google.com/file/d/19XjQ5s3y5T5kEoC4Y9iPRhX1M6Hvfu-4/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12523 [article]

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