Synthesis and Properties of Hyperbranched Dispersant for High Concentration of CWS

The 1.5 generation hyperbranched molecule was synthesized with dehydroabietylamine as the core by means of Michael addition reaction and amidation condensation reaction with ethylenediamine and methyl acrylate as raws by divergent method. Then, the dispersant was synthesized by means of the 1.5G hyperbranched molecule as initiator by reaction with 2-aminoethanesulfonic acid. The structure of products were identified by IR spectra and 1HNMR spectra. The influences of dispersant on apparent viscosity,rheological behaviour and static stability of coal water slurry prepared from Shenfu coal are studied. The results showed that as the slurry concentration reach at 67% the dosage of the dispersant was 0.4% (m/m), the viscosity of the coal water slurry was only at 987 mPa·s. The rheological investigation indicates that the slurry pumped with dispersant is pseudoplastic fluid.