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Waterborne polyurethane dispersions obtained by the acetone process: A study of colloidal features

✍ Scribed by H. Sardon; L. Irusta; M. J. Fernández-Berridi; J. Luna; M. Lansalot; E. Bourgeat-Lami

Book ID: 102742510
Publisher: John Wiley and Sons
Year: 2010
Tongue: English
Weight: 972 KB
Volume: 120
Category: Article
ISSN: 0021-8995
DOI: 10.1002/app.33308

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✦ Synopsis

Waterborne polyurethane (PU) dispersions were prepared from isophorone diisocyanate (IPDI), 2bis(hydroxymethyl) propionic acid (DMPA), 1,4-butane diol (BD), poly(propylene glycol) (PPG), and triethylamine (TEA) by means of phase inversion through the acetone process. Changes in DMPA content, initial PU content in acetone, phase-inversion temperature, evaporation conditions, and solvent nature were found to have a great impact on dispersion properties. Using a DMPA concentration of 0.30 mmol/g pol , stable PU dispersions could only be obtained when the initial PU content in acetone was at least 60 wt %, and phase-inversion temperature was lower than 30 C. However, when increasing the PU content to 75 wt %, stable dispersions were obtained using DMPA concentrations three times lower. Finally, viscosity curves during the water addition step as well as a phase diagram were determined to understand the particle formation mechanism.

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