Synthesis of Starch Graft Copolymer Dispersant and Its Application Performance in Coal-Water Slurry

摘要

In this study,a new starch graft copolymer dispersant for Chinese Shenhua coal-water slurry (CWS) was prepared by radical polymerization using styrene sulfonate (SSS),hydroxyethyl acrylate (HEA) and methyl acrylic acid (MAA) as graft monomers in oxidation-reduction initiator system.The apparent viscosity,static stabilization and rheology of Shenhua coal-water slurry prepared with the dispersant have been were investigated.The experimental results demonstrate that the CWS gives the minimal viscosity of 826 mPa.s at coal concentration of 66 wt％,dispersant dosage of 0.5 wt％ and shear rate of 100 s-1.Bleeding ratio tests indicate the starch graft copolymer can stabilize the slurry.The rheological behavior of the prepared CWS can be described by the pseudo-plastic fluid model.On the basis of the above,the starch graft copolymer dispersant has broad prospect for the application for CWS.