| 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 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 1 (01/2018) . - p. 141-148
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