Aqueous
polyurethane dispersion (PUD) has attracted increasing
attention in a wide range of industrial applications because of their
versatile properties as well as ecofriendly nature. In this study,
the aqueous PUD used in warp-knitted vamp printing was characterized
by Fourier transform infrared spectra, dynamic light scattering, and
laser Doppler electrophoresis. The mean diameter and zeta potential
are 206.6 nm and −18.3 mV, respectively. The rheological behavior
of aqueous PUD as a function of shear rate, temperature, and solid
content was investigated experimentally. Besides, a new correlation
model was proposed based on the Carreau equation and Arrhenius relation.
The resulting model has high accuracy in viscosity estimation under
complex conditions according to the prediction interval of 95%. Furthermore,
the reasonable ranges of parameters were proposed theoretically for
successful printing.
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