Synthesis and evaluation of a novel dispersant with jellyfish-like 3D structure for preparing coal-water slury

TAA, a new dispersant for making coal-water slurry (CWS), has been synthesized by grafting copolymerization of oxidized tannic acid (TA) and acrylic acid (M). H-1 NMR and FTIR tests revealed that TM has a unique jellyfish-like 3D molecular structure, in agreement with experimental evidences from contact angle and zeta potential measurements. The surfactivity of TM in aqueous solution was characterized using a surface-tension meter. The rheological properties and static stability of CWS containing 66 wt. % coal with 0.3 wt.% TM dosage were examined and compared with slurries prepared with two commercial dispersants, i.e. sodium dodecyl sulfate (SDS) and sodium polystyrene sulfonate (PSS). TM showed excellent slurry-making performance due to its special 3D structure, with polar and non-polar sites in the bottom plane exhibiting affinity to those on the coal particle surfaces to build strong interactions. CWS prepared with TM showed good stability and favorable theological' properties compared with slurries prepared with SDS and PSS. The present work provides a new approach to the development of high-performance and environmentally friendly SAN-free dispersants from renewable resources. (C) 2017 Elsevier Ltd. All rights reserved.