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Synthesis and evaluation of a multi-block polycarboxylic acid for improving low-rank coal to make the slurry
Colloids and Surfaces A: Physicochemical and Engineering Aspects ( IF 5.2 ) Pub Date : 2022-04-12 , DOI: 10.1016/j.colsurfa.2022.128966
Junfeng Zhu , Jinling Li , Ruiqing Liu , Junqi Wang , Yiwen Tang , Wanbin Zhang , Guanghua Zhang

To increase the solid concentration and optimize the rheological properties and of low-rank coal water slurry (CWS), a series of multi-block polycarboxylic acid (PCRaf) dispersants wearing hybrid-length side chains by the reversible addition-fragmentation chain transfer (RAFT) polymerization in aqueous solution. Meantime, the random polycarboxylic acid (PCRan) dispersants with same monomers were prepared by random polymerization. The PCRaf dispersant used in making low-rank CWS shows better viscosity reduction and stabilizing effect on CWS than that of the PCRan dispersants with the same mole ratio of monomers. The rational reason supported by the results of the zeta potential and adsorption test is that the multi-block conformation of PCRaf is beneficial to molecule expansion which is more effective in the dispersion of coal particles. The multi-block PCRaf with hybrid-length side chains is well worth being popularized as a new high-effective dispersant for low-rank coal to make a slurry.



中文翻译:

多嵌段多元羧酸改良劣质煤制浆的合成与评价

为了提高低阶水煤浆(CWS)的固体浓度和优化流变性能,一系列多嵌段聚羧酸(PC Raf)分散剂通过可逆加成-断裂链转移( RAFT) 在水溶液中聚合。同时,通过无规聚合制备了具有相同单体的无规聚羧酸(PC Ran )分散剂。用于制备低级水煤浆的PC Raf分散剂对水煤浆的降粘和稳定效果优于PC Ran单体摩尔比相同的分散剂。zeta电位和吸附试验结果支持的合理原因是PC Raf的多嵌段构象有利于分子膨胀,更有效地分散煤颗粒。具有混合长度侧链的多嵌段PC Raf作为低阶煤制浆的新型高效分散剂值得推广。

更新日期:2022-04-12
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