纳米氢氧化镁粉体制备研究

Study on Preparation of Nano-structured Magnesium Hydroxide

以六水氯化镁为原料,利用氨水和氢氧化钠混合溶液为沉淀剂,采用直接沉淀法制备纳米氢氧化镁。其最佳反应条件为温度60℃,反应时间90 min,氯化镁浓度0.5 mol/L,体积比为1∶1乙醇和水为混合溶剂,表面活性剂聚乙二醇-400用量为六水氯化镁质量的3%,烘干温度为80℃。实验得到粒径分布窄、分散性好的氢氧化镁粉体,对纳米氢氧化镁的工业化生产有重要意义。

Using magnesium chloride hexahydrate as material, taking the mixture of ammonia and sodium hydroxide as precipitant, nano-structured magnesium hydrate was prepared based on direct precipitation method. The best conditions were gotten： reaction temperature was 60℃, reaction time was 90 min, the concentration of magnesium chloride was 0.5 mol/L, the mixed solvent was ethanol/water mixture and the volume ratio of ethanol to water was 1 ：1, the amount of surface active agent polyethylene glycol-400 was 3 % of magnesium chloride hexahydrate, the drying temperature was 80 ℃. The resulting magnesium hydrate showed narrow diameter distribution and good dispersion, which was of great significance to industrial production of nano-structured magnesium hydroxide.