超细水滑石类化合物的制备

Study on preparation of superfine hydrotalcite-like compounds

介绍了共沉淀法、成核／晶化隔离法、溶胶-凝胶法、微波照射法、超声波共沉淀法及分散剂介入法等制备超细水滑石类化合物的方法，其中，成核／晶化隔离法、溶胶-凝胶法、微波照射法合成的水滑石化合物粒径都可以达到纳米级。超声波共沉淀法对水滑石粒径的减小较为显著，中值粒径从普通共沉淀的8．06μm减小到超声辐射下的0.53μm；分散剂的分散作用也很大程度上阻止了颗粒的凝聚，中值粒径从0．53μm减小到0．32μm。

This paper introduced the prepared methods of superfine hydrotalcite-like-compounds： precipitation, nucleation/crystal separation, sol-gel, microwave radiation, ultrasonic wave precipitation and inserted dispersant agent etc. Among these methods,hydrotalcite-like-compounds which were synthesized by nucleation/crystal separation, sol-gel, microwave radiation could achieve nanometer. However, the novel method-ultrasonic wave precipitation reduced the crystal size of hydrotalcite dramatically. At the same time,medium crystal size was reduced from 8.06 μm of general precipitation to 0.53μm of ultrasonic radiation. Dispersant agent＇ s dispersive action impeded granulometric coacervation and reduce medium crystal size from 0.53 μm to 0.32μm.