丙烯酸-苯乙烯磺酸钠-甲基丙烯酸羟乙酯共聚物分散剂的合成及其应用

以丙烯酸(AA)、苯乙烯磺酸钠(SSS)和甲基丙烯酸羟乙酯(HEMA)为单体，经聚合反应得AA-SSS-HEMA三元共聚物钠盐分散剂，研究了其对BaSO4和农药莠去津的分散效果，用扫描电镜、光散射粒度分析仪等对分散后颗粒的表面形态及粒径分布进行表征. 结果表明，当单体的摩尔配比AA:SSS:HEMA=4:1:0.6、反应温度70℃、引发剂量占单体总量12%、聚合时间为2 h时，所制备的分散剂对BaSO4分散效果最好，悬浮率达到98.99%. 该分散剂对75%莠去津水分散粒剂的悬浮率为95.47%，与国外分散剂产品罗地亚T36的分散效果接近.

Synthesis and Application of Copolymeric Dispersant of Acrylic Acid-Styrene Sulfonic Sodium-Hydroxyethyl Methacrylate

The copolymeric dispersant of acrylic acid-styrene sulfonic sodium-2-hydroxyethyl methacrylate was synthesized with acrylic acid (AA), styrene sulfonic sodium (SSS) and 2-hydroxyethyl methacrylate (HEMA) as monomers. The effects of the dispersant on dispersion of BaSO4 granules and herbicide atrazine water dispersible granules (WDG) were studied. At the same time, SEM and laser diffraction particle size analyzer were applied to analyze the properties of suspensions. The experimental results showed that the copolymer had an excellent dispersion efficiency when the molar ratio of AA, SSS and HEMA is 4:1:0.6, reaction temperature 70 ℃, 12% of the mass fraction of initiator in total monomers, and reaction time 2 h, the suspension percentage of BaSO4 is 98.99% and that of 75% atrazine WDG 95.47%, being close to that of 75% atrazine WDG comprising Rhodia T36.