Synthesis and properties of sulfonated waterborne polyurethane dispersion
The sulfonated waterborne polyurethane(WPU) dispersions were synthesized by using the prepolymerization process, with polybutylene adipate(PBA) as soft segment, hexamethylene diisocya-nate(HDI) and isophorone diisocyanate(IPDI) as hard segment, self-made N-(2-aminoethyl)-2-amino sodium ethyl sulfonate( AAS) as hydrophilic chain extender. The chain structure and the particle size were confirmed by the analysis of Fourier transform infrared spectroscopy(FT-IR) and transmission e-lectron microscopy(TEM) respectively. Effects of AAS content and n( HDD : n(IPDI) on the emulsion properties of sulfonated WPU were studied. The results show that with the increase of AAS content or n(HDI) : n(IPDI), the viscosity increases while the particle size decreases. The TG curve indicates that the formed film from the hybrid emulsion has high heat resistance, and the DSC thermo-grams show that the higher content of AAS, the lower glass transition temperature and the higher en-dothermic melting temperature.
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维普
