阴离子型水性超分散剂的制备及其表征

The synthesis and characterization of aqueous anionic hyperdispersant

根据超分散剂作用机理及结构设计原则，以马来酸酐、正丁醇、丙烯酸为原料，过硫酸铵为引发剂，通过先酯化后共聚的方法，制备出低相对分子质量的水溶性超分散剂。通过红外光谱（FT-IR）对聚合物的结构进行表征，运用乌氏黏度法测定其相对分子质量．用合成的超分散剂对纳米二氧化钛、纳米碳酸钙进行了分散稳定性的研究，发现该超分散剂能使纳米二氧化钛在水溶液中稳定分散1152h以上，使纳米碳酸钙悬浮液的黏度降低到接近水的黏度．该超分散剂能有效的分散超细粒子．

Based on the reaction mechanisms and the design principle of hyperdispersant, the n-butyl alcohol, maleic acid and acrylic acid were selected as the raw material, and the ammonium persulphate as the initiator. A low relative molecular mass and water-solubled hyperdispersant was synthesized by the esterification and polymerization. The FT-IR was used to identify the functional group in the polymer, the viscosimetry was used to determine the relative molecular mass. The dispersion and stabilization properties of the nanosized TiO2 and nanosized CaCO3 hyperdispersant were studied. The result showed that the modified TiO2 can steady suspended 1152h in water, the viscosity of the modified CaCO3 approached to the water＇s. The hyperdispersant can disperse nanosized particles successfully.