In this work, a novel amphoteric copolymer named Poly(sodium p-styrenesulfonate–co-acrylic acid-co-diallyldimethylammonium chloride) (P(SS-co-AA-co-DMDAAC)) was synthesized via free radical polymerization. Afterwards, P(SS-co-AA-co-DMDAAC) was explored for use as a dispersant in coal water slurry (CWS) preparation. The structure of P(SS-co-AA-co-DMDAAC) was verified by Fourier transform infrared spectroscopy and nuclear magnetic resonance. The synthetic conditions were optimized as the feed ratio of AA to SS was 1 : 1 (for Yulin coal) or 1.5 : 1 (for Yili coal), and DMDAAC dosage was 4.0 wt% (for Yulin coal) and 6.0 wt% (for Yili coal) toward total monomers. The performances of P(SS-co-AA-co-DMDAAC) as a dispersant for CWS were evaluated by various technologies, such as apparent viscosity, zeta potential, static stability and contact angle measurements. The results revealed that the optimized dosage of P(SS-co-AA-co-DMDAAC) in CWS preparation was 0.3 and 0.4 wt% for Yulin coal and Yili coal respectively. In this optimum condition, CWS prepared using P(SS-co-AA-co-DMDAAC) as dispersant showed a typical shear thinning behaviour and excellent stability, which are desired in industries. The rheological models also confirmed the pseudo-plastic characteristics of CWS. Finally, compared with the widely used anionic dispersant naphthalene sulphonate formaldehyde condensate (NSF) and poly(sodium p-styrenesulfonate) (PSS), P(SS-co-AA-co-DMDAAC) developed in this work exhibited better slurry making performance. The introduction of cationic functional groups promoted the adsorption of the dispersant, which further enhanced the electrostatic repulsion and steric hindrance among coal particles. Accordingly, the viscosity of CWS decreased and static stability enhanced.

在这项工作中，通过自由基聚合合成了一种新型两性共聚物，名为聚（对苯乙烯磺酸钠-丙烯酸-二烯丙基二甲基氯化铵）（P（SS- co -AA- co -DMDAAC））。随后，探索了P(SS- co -AA- co- DMDAAC)作为水煤浆（CWS）制备中的分散剂。通过傅里叶变换红外光谱和核磁共振验证了P(SS- co -AA- co -DMDAAC)的结构。优化合成条件为AA:SS投料比为1:1（榆林煤）或1.5:1（伊犁煤）,DMDAAC用量为4.0 wt%（榆林煤）和6.0 wt%（伊犁煤）。伊犁煤炭）走向单体总量。通过表观粘度、zeta 电位、静态稳定性和接触角测量等多种技术评估 P(SS- co -AA- co- DMDAAC) 作为水煤浆分散剂的性能。结果表明，对于榆林煤和伊犁煤来说，水煤浆制备中P(SS- co -AA- co -DMDAAC)的最佳用量分别为0.3和0.4wt%。在此最佳条件下，使用P(SS- co -AA- co- DMDAAC)作为分散剂制备的CWS表现出典型的剪切稀化行为和优异的稳定性，这是工业界所期望的。流变模型也证实了水煤浆的假塑性特征。最后，与广泛使用的阴离子分散剂萘磺酸盐甲醛缩合物（NSF）和聚对苯乙烯磺酸钠（PSS）相比，本工作开发的P（SS- co -AA- co- DMDAAC）表现出更好的制浆性能。 阳离子官能团的引入促进了分散剂的吸附，进一步增强了煤颗粒间的静电斥力和空间位阻。因此，水煤浆的粘度降低，静态稳定性增强。