柠檬酸酯型聚羧酸水煤浆分散剂的合成与研究

Synthesis and Research on Citric Acid Polycarboxylic Dispersant of Coal Water Slurry

以柠檬酸、丙烯酸、聚乙二醇为原料采用直接酯化法合成大分子单体,以水为溶剂,以酯化大单体、苯乙烯磺酸钠、丙烯酸、烯丙基聚乙二醇单体为共聚单体,通过自由基聚合制备了柠檬酸酯型水煤浆分散剂。探讨了分散剂的聚合条件对其性能的影响并对分散剂性质进行了分析。结果表明:当酯化大单体、丙烯酸、苯乙烯磺酸钠、烯丙基聚乙二醇物质的量之比为2∶4∶1∶1,引发剂用量为单体质量的2%,聚合温度为75℃时,分散剂性能最好,当分散剂添加量为0.3%,水煤浆质量分数为64%时,水煤浆黏度为626 mPa.s,说明该分散剂具有较高的分散性能。

With citric acid,acrylic acid,polyethylene glycol as raw materials,the direct esterification method was applied to synthetize the molecule monomer.Taking water as the solvent,taking esterification monomer,sodium p-styrene sulfonate,acrylic acid,allyl polyethylene glycol as the copolymerization monomer,the freeradical polymerization was applied to prepare a new citric acid polycarboxylic dispersant of coal water slurry.The paper had a discussion on the polymerization condition of the dispersant influenced to the performances and had a property analysis on the dispersant.The results showed that when the mixing ratio of esterification monomer,acrylic acid,sodium p-styrene sulfonate,allyl polyethylene glycol was 2∶4∶1∶1 individually,the dosage of the initiator was 2% of the monomer quantity and the polymerization temperature was 75 ℃,the performances of the dispersant would be best.With the dispersant,when the added quantity was 0.3%,the quality fraction of the coal water slurry was 64% and the viscosity of the coal water slurry was 626 mPa·s,the dispersant would have high dispersion performances.