Synthesis of a novel amphoteric copolymer and its application as a dispersant for coal water slurry preparation

In this work, a novel amphoteric copolymer was synthesized via free radical polymerization, named Poly(sodium p-styrenesulfonate–co-acrylic acid-co-diallyldimethylammonium chloride) (P(SS-co-AA-co-DMDAAC)). 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 (FTIR) and Nuclear magnetic resonance (NMR). 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 wt% and 0.4 wt% for Yulin ...

本研究通过自由基聚合法合成了一种新型两性共聚物，命名为聚(对苯乙烯磺酸钠-co-丙烯酸-co-二烯丙基二甲基氯化铵)（Poly(sodium p-styrenesulfonate-co-acrylic acid-co-diallyldimethylammonium chloride)，简称P(SS-co-AA-co-DMDAAC)）。随后，将该共聚物P(SS-co-AA-co-DMDAAC)作为水煤浆（CWS）制备用分散剂开展应用研究。采用傅里叶变换红外光谱（Fourier transform infrared spectroscopy，FTIR）与核磁共振波谱（Nuclear magnetic resonance，NMR）对该共聚物的结构进行了表征确认。合成工艺优化条件为：针对榆林煤，丙烯酸（acrylic acid，AA）与对苯乙烯磺酸钠（sodium p-styrenesulfonate，SS）的投料比为1:1；针对伊犁煤，该投料比为1.5:1；且二烯丙基二甲基氯化铵（diallyldimethylammonium chloride，DMDAAC）的用量为总单体质量的4.0 wt%（榆林煤）与6.0 wt%（伊犁煤）。采用表观黏度、Zeta电位、静态稳定性及接触角测试等多种技术手段，评价了P(SS-co-AA-co-DMDAAC)作为水煤浆分散剂的应用性能。研究结果表明，在水煤浆制备中，P(SS-co-AA-co-DMDAAC)的最优用量对于榆林煤为0.3 wt%，对于伊犁煤为0.4 wt%……