Journal
PROGRESS IN ORGANIC COATINGS
Volume 86, Issue -, Pages 1-10Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2015.03.013
Keywords
Waterborne polyurethanes; High solid content; Particle size distribution
Funding
- National Hightech Research and Development Projects (863) [2013AA06A306]
- National Natural Science Foundation of China [20874102]
- Sichuan Province Science and Technology Support Projects [2010FZ0093]
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A new method named two-step emulsification process was developed to synthesize high solid content waterborne polyurethanes by strict control of the bimodal particle size distribution. In the first step, a series of 40% solid content polyester-based (WPU-1) with low content of hydrophilic group and large particle size were firstly synthesized. In the second step, polyether-based prepolymers (WPU-2 prepolymers) with high content of hydrophilic group were firstly prepared and WPU-1 emulsions were used to emulsify WPU-2 prepolymers to obtain the final emulsions with high solid content (WPU-3). The particle size of WPU-3 present bimodal distribution and the diameter ratio and volume percentage of large particles to small particles in WPU-3 were able to be strictly controlled by this method. The viscosity of WPU-3 with 55% solid content was only 489.1 mPa s(-1) when the diameter ratio of large particles to small particles was 9.2 and the volume percentage of large particles was 74%. (C) 2015 Elsevier B.V. All rights reserved.
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