Abstract: 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.

Key words: polycarboxylate, dispersant, methoxy polyethylene glycol, side chain length

摘要： 以甲基丙烯酸（MAA）和 4 种不同侧链长度的甲氧基聚乙二醇（MPEG相对分子质量分别为350，500，750，1000）先聚合得到酯化大单体（MPEGMAA），再以甲基丙烯酸，烯丙基磺酸钠（SAS）为单体，在引发剂过硫酸钾，阻聚剂对苯二酚作用下聚合得到 4 种具有不同侧链长度的聚羧酸盐分散剂。通过红外（FT-IR）、核磁共振氢谱（¹H NMR）和凝胶渗透色谱（GPC）对聚合物的结构、相对分子质量及其分布进行了表征和分析，并将其作用于彬长煤制浆，考察了浆体的表观黏度、流变性、zeta电位、吸附性以及最大成浆浓度和稳定性，测定其与煤的接触角，并通过X射线光电子能谱（XPS）分析，得出煤粒表面吸附分散剂后的吸附层厚度为 6.12 nm。结果表明，侧链长度为SAS/MAA/MPEGMAA750的聚羧酸盐分散剂具有良好的润湿和吸附效果，对彬长煤具有更好的降黏、分散和稳定作用。

关键词: 聚羧酸盐, 分散剂, 甲氧基聚乙二醇, 侧链长度