Study of ionic/nonionic polyurethane dispersions with high solid content and low viscosity using a complex hydrophilic chain-extending agent / Faxing Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 1 (01/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 1 (01/2018) . - p. 141-148 Titre : Study of ionic/nonionic polyurethane dispersions with high solid content and low viscosity using a complex hydrophilic chain-extending agent Type de document : texte imprimé Auteurs : Faxing Zhang, Auteur ; Xiaoli Wei, Auteur Année de publication : 2018 Article en page(s) : p. 141-148 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Haut extrait sec Polymères en émulsion Polyuréthanes Résistance aux électrolytes Résistance thermique Stabilité au stockage Tags : 'Dispersion  de  polymère  ionique/non  ionique"  Polyuréthane  'Agent  d'extension  chaîne  hydrophile  complexe'  'Haute  teneur  en  solides' Index. décimale : 667.9 Revêtements et enduits Résumé : An ionic/nonionic polyurethane dispersion with high solid content and low viscosity with a complex hydrophilic chain-extending agent was prepared using isophorone diisocyanate as a hard segment and propylene oxide glycol as a soft segment. The complex hydrophilic chain-extending agent consisted of DPSA and BDSA. The effects of the molar ratio of DPSA/BDSA on the properties of the resultant polyurethane dispersions were studied. The morphologies and properties of the ionic/nonionic PU dispersions were examined using particle-size, TEM, and viscosity analyses. It was found that the ionic/nonionic dispersions possessed wide particle-size distributions due to the addition of the complex hydrophilic chain-extending agent. The ionic/nonionic PU dispersions possessed higher solid content than conventional WPU dispersions because the number and volume percentage of the large particles and small particles of the ionic/nonionic dispersions met the requirements for high solid content. It was observed that the solid content of the ionic/nonionic dispersion increased and then decreased with an increasing molar ratio of DPSA/BDSA. When the ratio ranged from 4:10 to 5:10, the solid content of the ionic/nonionic PU dispersion reached up to 55%. It was also noticed that the apparent viscosity of the ionic/nonionic polyurethane dispersion decreased with an increasing molar ratio of DPSA/BDSA. The complex hydrophilic chain-extending agent consisting of DPSA and BDSA enhanced the solid content and decreased the viscosity of the ionic/nonionic dispersions, which are very important for improving the properties and expanding the applications of PU dispersions. In addition, the ionic/nonionic polyurethane dispersion had good electrolyte-resistance properties, stability at both high and low temperatures, and storage stability. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of ionic/nonionic polyurethane dispersions - Characterization - RESULTS AND DISCUSSION : Average particle diameter and distribution of the dispersions - Particle morphology of the dispersions - Rheology of the dispersions - The stability of the dispersions DOI : 10.1007/s11998-017-9965-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9965-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30106 [article]

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