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Preparation and Shelf‐Life Stability of Aqueous Polyurethane Dispersion
Author(s) -
Chinwanitcharoen Charoen,
Kanoh Shigeyoshi,
Yamada Toshiro,
Tada Kaoru,
Hayashi Shunichi,
Sugano Shunji
Publication year - 2004
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200451222
Subject(s) - adipate , polyurethane , acetone , ethylene glycol , emulsion , materials science , aqueous solution , particle size , chemical engineering , dispersion (optics) , polymer chemistry , particle size distribution , particle (ecology) , dispersion stability , chemistry , organic chemistry , composite material , polymer , physics , oceanography , optics , engineering , geology
A series of aqueous polyurethane dispersion were prepared by the reaction of hydroxyl‐terminated poly(ethylene adipate), dimethylol propionic acid, 4,4′‐diphenylmethane diisocyanate, and ethylene glycol. Formation of the dispersion was achieved by phase inversion of an acetone solution of the polyurethane with water, utilizing carboxylate anion groups as the internal emulsifying sites. The amount of acetone added has a large effect on the particle diameter (0.08 μm to 8.61 μm) and particle size distribution of the polyurethane emulsion. The storage stability was evaluated in terms of particle size and particle size distribution. The aqueous emulsion obtained with no use of acetone was sufficiently stable in storage at least over six months.