MgCl_2添加方式对Mg(OH)_2形貌及粒度分布的影响

Effect of the means of adding MgCl_2 on the morphology and particle size distribution of Mg(OH)_2

氢氧化镁作为一种无卤阻燃剂,在聚合物阻燃领域具有重要的前景。采用反向沉淀法制得纳米级氢氧化镁粉体,研究了氯化镁添加方式对氢氧化镁粒度分布及团聚状态的影响,并通过热红外联用技术对其热解规律进行了分析。实验结果表明,氯化镁添加方式对氢氧化镁粒度分布及团聚状态有显著的影响;分4次加入氯化镁溶液所得氢氧化镁的粒度分布最均匀,小粒子所占的比例最大,不容易发生团聚现象。

Magnesium has an important prospect in the field of polymer flame retardant as a kind of halogen-free flame retardant. The nanoscale magnesium hydroxide powder was prepared by Reverse precipitation,the effect of the means of adding Mg Cl2 was studied on the particle size distribution and reunited state of Mg( OH)2,and the pyrolysis regularity of Mg( OH)2was analyzed by the thermal infrared detection technology. The experimental results show that the means of adding Mg Cl2 has a significant effect on the distribution and reunited state of Mg( OH)2; the size distribution of Mg( OH)2was the most homogeneous by four times to add for Mg Cl2,the proportion of small particles is the largest,and the reunion phenomenon is not easy to happen.