Development of regenerated protein fibers from a collagen-polyvinyl alcohol complex / E. C. Shin in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 10 (10/2007)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CII, N° 10 (10/2007) . - p. 315-321 Titre : Development of regenerated protein fibers from a collagen-polyvinyl alcohol complex Type de document : texte imprimé Auteurs : E. C. Shin, Auteur ; J. S. Heo, Auteur ; W. J. Kim, Auteur ; S. C. Lee, Auteur Année de publication : 2007 Article en page(s) : p. 315-321 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Regenerated protein fibers were wet-spun by collagen protein extracted from chrome shavings. A “pure” collagen protein extract of molecular weight _> 100,000 Da and chromium content <5 ppm was produced. To increase the spinning stability and physical strength of the fibers, the aqueous collagen solution was mixed with polyvinyl alcohol containing _<0.3 percent glutaraldehyde in a subsequent unique treatment. Good spin ability was obtained when the viscosity was _>1,000 cps. Optimal spin ability conditions were obtained at water temperature of 30~35°C in a coagulating bath containing a mixture comprising a minimum of 40 percent Na2SO4 and 1 M H3BO3. A water-resistant regenerated protein was eventually produced by chemical crosslinking using 15 percent Na2SO4, 0.5 percent glutaraldehyde, and 0.25 percent formaldehyde. The regenerated protein fiber had a specific gravity of 1.3 g/cm2, tensile strength of 1.32~2.0 g/d, and elongation of 29~38 percent. En ligne : https://drive.google.com/file/d/1DsDAG5UmYaDmHauxqjUkLzEF-ohREFRp/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3325 [article]

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Dyeing process for improving properties of black color using natural dyes and mordant / S. C. Lee in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 2 (02/2012)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVII, N° 2 (02/2012) . - p. 33-39 Titre : Dyeing process for improving properties of black color using natural dyes and mordant Type de document : texte imprimé Auteurs : S. C. Lee, Auteur ; E. C. Shin, Auteur ; W. J. Kim, Auteur ; S. M. Park, Auteur Année de publication : 2012 Article en page(s) : p. 33-39 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Colorants végétaux Cuirs et peaux -- Teinture Extraction (chimie) Fer Mordançage (teinture) Tags : 'Bois  sappan'  'Noix  galles'  'Mordant  fer'  'Colorant  végétal  noir'  'Extraction  colorants'  Alcool  'Liqueur  grasse  anionique'  'Stabilité  frottage' Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : An environmentally friendly nontoxic leather product was produced using two kinds of natural dyes (gallnut and sappan wood) to create a black colorant that can be universally used in leather manufacturing. A chrome free aldehyde and aluminum tanning system was used to prepare the leather for the dye experiments. For the dye preparation experiments gallnut and sappan wood, which are representative polygenetic natural dyes, were extracted by alcohol extraction; then decompressed and refined under concentrating conditions to produce dye in powder form. To produce natural dyed leather with a black color, 5% gallnut and sappan wood were used and the mordant agent, iron mordant (FeSO4·7H2O) at 1% of the leather weight, was applied in three different sequences. Applying the mordant simultaneously produced a superior result compared to it application before or after the application of the natural dye. To evaluate the softness and color change of leather, an anionic fatliquor agent was used at 12% of the leather weight. An excellent dark black color and chroma was obtained on the leather surface as a mordant agent and complex compound. The excellent results obtained during the evaluation of rubbing fastness, K/S (coloring matter concentration of surface), and color difference enabled the conclusion that leather with a deep black color could be manufactured with this method. Note de contenu : EXPERIMENTAL : Materials - Apparatus - Process of eco-leather manufacture - Extraction of natural dyes - Measure of K/S - Measure of color difference - Fastness measuring of natural dyes leather - RESULTS AND DISCUSSION : pH change by natural dye and mordant content - Effect of mordant content and dyeing process on color - Effect of mordant type on color - Effect of anionic fatliquor agent content on color En ligne : https://drive.google.com/file/d/1sfj3_ha8OxTUu7jQigtT5ue4lH-ou9-T/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13568 [article]

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