No abstract

The rheological properties of quinacridone pigment dispersion with ammonium salt of styrene-maleate (SMA) copolymer (SMA-NH 4 ) as a dispersant were measured at 258C. The effects of the SMA-NH 4 concentration, pH, and ionic strength of the system on the rheology of concentrated quinacridone pigment dispersion (in aqueous medium) were studied. All of the experimental results were correlated with the Herschel-Bulkley model. The estimated values of yield stress, t y , and model parameters such as the consistency coefficient, K, and the flow characteristic exponential, n, could reflect the variation of the surface charges of pigment particles, interactions between particles and the structure of dispersion. The flow curve of the quinacridone pigment dispersion without SMA-NH 4 showed a pseudoplastic character, while the flow curve of the quinacridone pigment dispersion with SMA-NH 4 copolymer showed a nearly Newtonian behavior. The rheological properties of aqueous quinacridone pigment dispersion with SMA-NH 4 were strongly affected by both pH and ionic strength.

Polyacrylate microgel emulsion was prepared by emulsion polymerization using styrene, α-n-butyl acrylate and methyl methacrylate as monomer, polyoxyethylene octylphenol ether (TX-30) and sodium dodecyl sulfate(SDS) as combine emulsifier, divinyl benzene and ammonium persulfate (APS) as initiator，respectively. The prepared microgel was analyzed by a variety of measurment methods, such as Fourier transform infrared spectroscopy and transmission electron microscopy. The effect of microgel on the rheological properties of adhesives, leveling, mechanical properties and pigment printing performance was studied. The rhelogy and the color fastness of the pigment printing binder of printed fabrics were measured by rheometer and friction color fastness test instruments, respectively. At the same time, the mechanical properties of the adhesive film was measured by strength tester. The results show that the thixotropy, leveling and mechanical properties of adhesive printing binder and pringting quality of coating fabrics were improved when the microgel was added.