The esterified macromonmer (MPEGMAA) was obtained by esterification ofmethoxy polyethylene glycol (MPEG)withfour kinds of different side chain lengthsand methacrylic acid (MAA).Four kinds of different side chain lengths of polycarboxylate dispersants were prepared from esterified macromonmer (MPEGMAA)

methacrylic acid (MAA)

allyl sulfonate (SAS) as monomers

potassium persulfate (K2S2O8) as initiator and hydroquinone as inhibitor. Their structures

molecular weights and distributions were characterized and analyzed by FT-IR

1H NMR and gel permeation chromatography (GPC). The dispersants were used for Binchang coal

and apparent viscosity

rheology

zeta potential

adsorption

maximum slurry concentration and stability of the slurry were investigated. The contact angles between coal surface and dispersant were measured

and the surface of coal particles after adsorbing the dispersant with was analyzed with X-ray photoelectron spectroscopy (XPS)

with the thickness of adsorption layer of 6.12 nm. The polycarboxylate dispersant with the length of side chain SAS/MAA/MPEGMAA750 showed good wetting and adsorption

as well as better function of viscosity reduction

dispersion and stabilization on Binchang coal.