聚羧酸盐和聚萘磺酸盐分散剂在高浓度水悬浮剂中的应用

研究了聚羧酸盐分散剂(SD-819)和聚萘磺酸盐分散剂(SD-661)在水溶液中的表面性能;同时考察了分散剂添加量对500 g/L扑草净水悬浮剂(SC)中的吸附、Zeta电势和流变性能等的影响.结果表明,与分散剂SD-661相比,分散剂SD-819水溶液中的表面张力(γcmc)小,临界胶束浓度(cmc)和胶束生成自由能(ΔGmic)低,吸附量大,制备出的扑草净SC黏度低,流动性好,触变性优良.结果表明,聚羧酸盐分散剂更适用于高浓度扑草净SC的制备.

Application of Polycarboxylate and Naphthalenesulfonate Dispersants in High Concentration Suspension Concentrate

We studied the surface properties of polycarboxylate dispersant(SD-819) and polynaphthalene sulfonate dispersant(SD-661) in aqueous solution.We also investigated the effects of the addition of dispersant on the adsorption,zeta potential,and rheological properties of the 500 g/L suspension concentrate(SC) of prometryn.The results show that dispersant SD-819 have smaller surface tension(γcmc),lower critical micelle concentration(cmc),micelle formation free energy(Δ%G%mic) and bigger adsorption quantity in aqueous solution compared with the dispersing agent SD-661.Besides,prometryn SC prepared by SD-819 have low viscosity,good fluidity and excellent thixotropic.In conclusion,comparing two dispersants indicated that polycarboxylate dispersant is more suitable for the preparation of prometryn SC.