Synthesis and characterization of non-ionic and anionic two-component aromatic waterborne polyurethane
ISSN: 0369-9420
Article publication date: 8 August 2018
Issue publication date: 22 August 2018
Abstract
Purpose
The purpose of this paper is to synthesize and characterize a series of two-component aromatic waterborne polyurethane (2K-WPU) which is composed of non-ionic and anionic polyisocyanate aqueous dispersion and polyurethane polyol aqueous dispersion.
Design/methodology/approach
The polyisocyanate aqueous dispersion was synthesized through non-ionic and anionic hydrophilic modification procedures. The values of the hydrogen bonding index (HBI) and molecule structures of WPU were obtained by Fourier transform infrared (FTIR). The thermal, mechanical and water resistance properties of 2K-WPU films were investigated.
Findings
The appearance of non-ionic polyisocyanate aqueous dispersion and anionic polyisocyanate aqueous dispersion was colorless translucent pan blue and yellow opaque emulsions, respectively. FTIR not only showed that 2K-WPU was obtained from the polymerization of polyisocyanate component and polyhydroxy component by polymerization but also showed that the content of hydrogen bondings of anionic 2K-WPU (WPU 2) was higher than non-ionic 2K-WPU (WPU 1). The glass-transition temperature (Tg), storage modulus and water resistance of WPU 2 were higher than WPU1, whereas the thermal stability of WPU1 was better than WPU 2.
Practical implications
The investigation established a method to prepare a series of 2K-WPU which was composed of non-ionic or anionic polyisocyanate aqueous dispersion and polyurethane polyol aqueous dispersion. The prepared 2K-WPU film could be applied as substrate resin material in the field of waterborne coating.
Originality/value
The paper established a method to synthesize a series of 2K-WPU. The effect of HBI value and the molecule structure of soft segment on the thermal stability, mechanical and water resistance properties of 2K-WPU films were studied.
Keywords
Acknowledgements
The authors are grateful to the support of the National Natural Science Foundation of China (Grant No. 21372067).
Citation
Zhang, S. and Jiang, X. (2018), "Synthesis and characterization of non-ionic and anionic two-component aromatic waterborne polyurethane", Pigment & Resin Technology, Vol. 47 No. 4, pp. 290-299. https://doi.org/10.1108/PRT-07-2017-0067
Publisher
:Emerald Publishing Limited
Copyright © 2018, Emerald Publishing Limited