Citation: Huan-huan Zhang, Ran Niu, Xin-bing Guan, Dong-hua Xu, Tong-fei Shi. Rheological Properties of Waterborne Polyurethane Paints[J]. Chinese Journal of Polymer Science, ;2015, 33(12): 1750-1756. doi: 10.1007/s10118-015-1718-8 shu

Rheological Properties of Waterborne Polyurethane Paints

Huan-huan Zhang ^1,2,3 ,
Ran Niu ^1,2,3 ,
Xin-bing Guan ⁴ ,
Dong-hua Xu ⁵ ,
Tong-fei Shi ⁵

1.
1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
2.
2. University of Chinese Academy of Sciences, Beijing 100049, China
3.
4.
Shanghai WaterBased Chemical Co. Ltd, Shanghai 200072, China
5.
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China

Received Date: 15 June 2015
Revised Date: 23 July 2015

Fund Project: This work was financially supported by the National Natural Science Foundation of China(Nos.21274152, 51473168 and 21234007).

The rheological properties of two specific waterborne polyurethane(PU) paints were studied by both macrorheological and microrheological methods. During the macrorheological measurement on a rotary rheometer, evaporation of solvent cannot be totally excluded, which has an influence on the reliability of rheological results. So, the linear oscillatory frequency sweep results(storage and loss modulus versus frequency) and steady shear results(viscosity versus shear rate) got from the rotary rheometer measurement are only used for qualitative analysis. As the evaporation of solvent can be neglected during microrheological measurements on a diffusing wave spectroscope(DWS), the results of storage modulus(G') and loss modulus(G) versus frequency are more credible than the results obtained from the rotary rheometer measurement. Thus, the results of G' and G versus frequency from DWS measurements are used for quantitative analysis in this work. The G' for both of the waterborne PU paints are larger than G at low frequency and that is opposite at high frequency in the experimental angular frequency range. The values of modulus at same frequency and viscosity at low shear rate for the two PU paints have apparent difference, which determines the difference of their application.
- Rheology,
- Waterborne polyurethane paints,
- Macrorheology,
- Microrheology,
- Diffusing wave spectroscopy(DWS)
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