Application of Y-shaped polyurethane and polyacrylic acid as a complex retanning agent in aldehyde-tanned goat leather / Shuangquan Lai in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 11 (11/2017)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXII, N° 11 (11/2017) . - p. 367-376 Titre : Application of Y-shaped polyurethane and polyacrylic acid as a complex retanning agent in aldehyde-tanned goat leather Type de document : texte imprimé Auteurs : Shuangquan Lai, Auteur ; Yong Jin, Auteur ; Hanping Li, Auteur ; Lei Zhang, Auteur ; Xin Yin, Auteur Année de publication : 2017 Article en page(s) : p. 367-376 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acide polyacrylique Copolymères -- Synthèse Copolymères séquencés Cuirs et peaux -- Analyse Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés organoleptiques Cuirs et peaux -- Propriétés physiques Cuirs et peaux de chèvres Glutaraldéhyde Morphologie (matériaux) Polymères amphiphiles Polyuréthanes Retannage Tannage organique Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A kind of Y-shaped amphiphilic block polyurethane copolymers (PUGs) with different molecular weights were successfully synthesized to be used as retanning agent combined with polyacrylic acid (PAA) for modified glutaraldehyde tanned goatskin. The structures of resulting products were characterized by FTIR, and the molecular weights of products were measured with GPC. The application performances were investigated by measuring the organoleptic and physical mechanical properties of resulting leathers according to the alone or combined use of PUG and PAA, the molecular weight of PUG, and the offer percentage of retanning agent. The best performance was found in the leather retanned by PUG750 and PAA complex retanning agent at the total offer percentage of 4 wt%. Finally, the free formaldehyde contents in the leathers retanned with 4 wt% PUG750 and PAA at different pH conditions were analyzed with acetyl acetone colorimetric method. The mechanical properties as well as the fibers morphologies of the experimental and control groups were also investigated. The results demonstrated that when the pH value at the later stage of retanning process was controlled at 4.0 or 3.0, the free formaldehyde content was significantly reduced by 20.3% or 38% respectively ; and the physical mechanical properties of leathers were also very excellent to meet the performance requirements of goatskin garment leathers. According to these results, the method for using PUG and PAA as a complex retanning agent might be a good choice in chrome-free tanning process. Note de contenu : - MATERIALS AND METHODS : Materials - Synthesis of Y-shaped amphiphilic block polyurethane copolymers (PUGs) - Synthesis of polyacrylic acid (PAA) - Fourier Transform Infrared Spectra (FTIR) - Gel permeation chromatography (GPC) - Application of polyurethanes and polyacrylic acid - Analysis of leather properties - Scanning electron microscopy analysis - Determination of free formaldehyde contents in leathers - RESULTS AND DISCUSSION : Synthesis of polyurethane copolymers and polyacrylic acid - Effect of different retanning agents on the organoleptic and physical properties of leathers - Effect of the molecular weight of PUG on the organoleptic and physical properties of leathers - Effect of the amount of complex retanning agent on the organoleptic and physical properties of leathers - Application of the complex retanning agent under different pH conditions En ligne : https://drive.google.com/file/d/1n0hhgDSLoOspbiCVezGLJhDkXewQevzZ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29395 [article]

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