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Impact of acrylic polymer molecular weight and groups on physicochemical properties and re-tanning effectiveness in leather manufacturing / Zhiyuan Zhu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 9 (09/2024)
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Titre : Impact of acrylic polymer molecular weight and groups on physicochemical properties and re-tanning effectiveness in leather manufacturing Type de document : texte imprimé Auteurs : Zhiyuan Zhu, Auteur ; Chunxiao Zhang, Auteur ; Biyu Peng, Auteur ; Xu Zhang, Auteur Année de publication : 2024 Article en page(s) : p. 405-414 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acide polyacrylique
Agents de tannage
Cuirs et peaux
Liaisons chimiques
Poids moléculaires
Potentiel zeta
Retannage
Réticulation (polymérisation)
Taille des particules
Tannage au chrome
ViscositéIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Acrylic polymers are widely employed as re-tanning agents in leather manufacturing due to their remarkable re-tanning and filling effectiveness, which is primarily attributed to the careful selection of monomers and control over molecular weight. In this study, a series of acrylic polymer re-tanning agents were characterized for their molecular weight and functional groups, followed by analysis of viscosity, particle size, the ability to form cross-linkage with chromium, penetration properties, and filling properties in chrome-tanned leather. The results demonstrated that the viscosity, particle size, surface charge intensity, and cross-linking ability with chromium increased with the increasing molecular weight of the acrylic acid re-tanning agent. The polymers with lower molecular weight exhibited uneven distribution in leather for the potential “capillary plugging” on the surface of leather. Higher molecular weights corresponded to stronger re-tanning and filling effectiveness, though the absorption was negatively affected. Additionally, non-carboxyl functional groups such as methyl group, ester group, amide group, and cyanide group, exhibited random effects on physicochemical properties and application characteristics of acrylic polymer retanning agents. Greater hydrophobicity of functional groups resulted in higher thickening rates for leather, while enhanced ability to form crosslinks with chromium led to improved compression resistance. This elucidation of the influence of basic structure on typical physical-chemical properties and application characteristics will facilitate the development of novel acrylic polymer re-tanning agents and re-tanning technology. Note de contenu : - EXPERIMENTAL :
- Materials
- Molecular weight measurement
- FT-IR analysis
- Viscosity determination
- Particle size and zeta potential determination
- Evaluation of the capacity of acrylic polymers to establish crosslinkage with chromium
- Application properties of acrylic polymers
- RESULTS AND DISCUSSION :
- FT-IR analysis and molecular weight characterization of polyacrylic acid re-tanning agent
- Viscosity analyzation of polyacrylic acid re-tanning agent
- Particle size and zeta potential measurements of polyacrylic acid re-tanning agent
- Reassessment of the crosslinking properties of chromium and acrylic polymer
- Penetration performance of polyacrylic acid re-tanning agent
- Re-tanning performance of polyacrylic acid re-tanning agent
- Table 1 : Re-tanning process
- Table 2 : Classification of acrylic polymersDOI : https://doi.org/10.34314/wgnp8v94 En ligne : https://drive.google.com/file/d/1G75OuLJJNjm2sEo7zP2w12dCgUZxHlRB/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41459
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