水热合成制备超细氢氧化镁阻燃剂

采用低温水热、高温水热、氢氧化钠环境水热、引入晶种水热等不同水热工艺制备出超细氢氧化镁粉体。分别对制备出的粉体进行了XRD、TEM、BET等表征，并将所得粉体添加到软质PVC中，进行了阻燃及力学性能测试。结果表明，在上述水热方法中，氢氧化钠环境水热与引入晶种水热法制得的氢氧化镁超细粉体比表面积低、极性小、分散性好，改性后添加于软质PVC中得到良好的应用效果，且引入晶种水热法易于工业化生产。

Study on the Preparation of Ultra- fine Magnesium Hydroxide Flame Retardant in Different Hydrothermal Treatment Methods

Different hydrothermal treatment methods, including hydrothermal treatment at low temperature, at high temperature, in NaOH solution and hydrothermal treatment after seeding as well, were used to treat the magnesium hydroxide powder. All of the samples were investigated by XRD, TEM, BET methods, and were added into inflexible PVC to test the flame retardancy and mechanical properties. The experimental result showed that the Ultrafine magnesium hydroxidepowder obtained in two of the above treatment methods(hydrothermal treatment in NaOH solution and hydrothermal treatment after seeding)had low surface areas, weak polarity and good dispersibility, and the good results were obtained when the powders were added into the flexible PVC after modified. In addition, the method of hydrothermal treatment after seeding could easily be used into industry production, and there is an expansive market in this field.