Effects of a clean subcritical degreasing system on wool fibers / Qiao Xia in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 5 (05/2021)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVI, N° 5 (05/2021) . - p. 162-167 Titre : Effects of a clean subcritical degreasing system on wool fibers Type de document : texte imprimé Auteurs : Qiao Xia, Auteur ; Yinxuan Wang, Auteur ; Zongcai Zhang, Auteur ; Hong Dai, Auteur Année de publication : 2021 Article en page(s) : p. 162-167 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Dégraissage (nettoyage) Laine brute Pentane Le pentane est un alcane linéaire de formule C5H12. Le terme pentane désigne aussi par extension abusive17 les trois isomères C5H12 : le n-pentane, le 2-méthylbutane ou isopentane et le 2,2-diméthylpropane ou néopentane. Ces diverses molécules comportent toutes cinq atomes de carbone. Utilisations : Le pentane est un solvant couramment utilisé en chimie organique. Propriétés chimiques : Le pentane brûle dans l'air selon la réaction : C5H12 + 8O2 —> 5CO2 + 6H2O (Wikipedia) Stabilité thermique Thermogravimétrie Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : It makes sense to use environmentally friendly methods of degreasing in fur-making process. In this study, subcritical n-pentane was used to degrease wool fibers. Thermogravimetric analysis (TGA) was used to observe and analyze the properties of the subcritical n-pentane degreased wool fibers. The results showed that the thermal stability of the fibers increased. Fourier Transform Infrared (FTIR) spectroscopy was used to analyze the structural changes of macromolecular chains in wool fibers. It was found that when the pressure was higher than 0.4 MPa, the wool fibers underwent a conformational change with the α-helix changing to β-folding. If the pressure was as high as 0.6 MPa, the disulfide bonds in the wool fibers scale layer appeared to break. X-ray powder diffraction experiment was used to study changes in wool fiber aggregation morphology. It was demonstrated that the crystalline zone of wool fibers changed and the fibers index grew, from 22.89% to 30.19%. Field emission scanning electron microscopy and ultra-depth of field microscopy was used to analyze changes in the surface morphology of wool fibers. The results suggested that after the treatment, the wool fibers were not damaged and the impurities on the wool surface were reduced. Note de contenu : - EXPERIMENTAL : Materials - Sample preparation - The experimental process - CHARACTERIZATION TECHNIQUES : Degreasing rate - Change in thermal stability in wool - Structural changes in wool fibers macromolecular chains using Fourier Transform Infrared (FTIR) spectroscopy - Structural changes in the aggregation state of wool fibers ssing X-Ray powder diffraction - Morphological changes on the wool surface using Scanning Electron Microscopy and ultra-depth microscopy - RESULTS AND DISCUSSION : Effect of degreasing - Effect of subcritical n-pentane treatment on thermal stability of wool fibers - Effect of subcritical n-Pentane treatment on macromolecular chain structure of wool fibers - Table 1 : Infrared characteristic absorption band of wool fibers22 - Table 2 : Relative intensity of some characteristic peaks of wool fibers after subcritical n-pentane treatment at different pressure DOI : https://doi.org/10.34314/jalca.v116i5.4292 En ligne : https://drive.google.com/file/d/1OUz4ZlvKlN2y_DdhPCN1R7GO6Ej2Oyvu/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35759 [article]

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The application of biosurfactants for scouring wool / Samuel J. Leighs in COLORATION TECHNOLOGY, Vol. 135, N° 1 (02/2019)  

[article]  inCOLORATION TECHNOLOGY > Vol. 135, N° 1 (02/2019) . - p. 48-52 Titre : The application of biosurfactants for scouring wool Type de document : texte imprimé Auteurs : Samuel J. Leighs, Auteur ; Steven J. McNeil, Auteur ; Steve L. Ranford, Auteur Année de publication : 2019 Article en page(s) : p. 48-52 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Avoine et constituants Biosurfactants Fibres textiles -- Lavage Laine brute Saponines Index. décimale : 677.3 Fibres animales Résumé : The first investigation of the use of biosurfactants for the scouring of raw wool is reported. A saponin, and a recently developed surface active oat extract, were evaluated at the laboratory scale using a first-to-be-reported benchtop scouring system with simulated flowback. The levels of contaminants remaining on the wool after bioscouring, along with the wool colour, were compared with those of wool that had been laboratory-scoured with a surfactant used in the commercial scouring of raw wool, namely a synthetic nine molar poly(oxyethylene)nonylphenyl (NPEO). Both biosurfactants can be extracted from land-based renewable crops. The saponin proved to be effective, producing low levels of residual contaminants on the wool, and colours that were not statistically different to those of wool scoured with NPEO. The oat extract was considerably less effective than the saponin, both in terms of colour and residual contaminant level. This study demonstrated the significant potential of biosurfactants in the scouring of the global greasy wool clip, which now comprises two billion kg per annum. Note de contenu : - EXPERIMENTAL : Materials - Scouring procedure - Test methods - RESULTS AND DISCUSSION : Residual grease on wool - Wool ash - Wool colour - Implications of these findings DOI : 10.1111/cote.12370 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12370 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31665 [article]

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