纳米氢氧化镁表面改性研究

Surface Modification of Nano-sized Magnesium Hydroxide

采用硬脂酸钠、十二烷基磺酸钠、油酸钠和硅酸钠4种改性剂对纳米氢氧化镁进行表面改性,讨论了改性剂加入量、改性温度、改性时间对活化指数的影响;应用沉降速率、吸油率、粉末接触角等指标对改性前后的纳米氢氧化镁进行分析,并应用TEM、XRD对改性前后的氢氧化镁进行表征。结果表明,硬脂酸钠在80℃、改性时间4 h、添加量5%时,改性效果最好;改性后氢氧化镁粒径变小,沉降速率减慢,吸油率下降,粉末接触角增大。

Surface modification of nano-sized magnesium hydroxide using four surface modifiers which being sodium stearate, sodium dodecylsulfonate, sodium oleate and sodium silicate was investigated. The effects of amount of surface modifier, modification temperature and time on activate index of magnesium hydroxide were discussed in the paper. The results show that sodium stearate was the best choice among four modifiers on surface modification and the optimum condition was 80 ℃ at 4h with the amount of 5%. The post-modification magnesium hydroxide has smaller particle size, larger powder contact angle, slower sediment rate, and less oil absorption.