Abstract: Superfine magnesium hydroxide with MgCl2 solution and NaOH solution are prepared；different modifiers are added to crude solution，including Stearic acid，Sodium stearate，Tetrabutyl titanate，D-glucose，and composite of two of them，then Mg(OH)2 is modified in situ. The surface property of Mg(OH)2 is improved and the filtration property is enhanced at the same time，the variation of sedimentation property is also studied. The results show that the resistance of filtration decreases 58.27%，41.42%，53.23% or 51.93% than that without modifier，the sedimentation speed decrease from 6.645×10?7m/s to 1.25×10?5 m/s，0.667×10?5 m/s，1.025×10?5 m/s or 1.104×10?5m/s respectively when modifier is Stearic acid，Sodium stearate，Tetrabutyl titanate or D-glucose. The performance of complex modifier is better than to that of single ones.

Key words: superfine magnesium hydroxide, surface modifier, filter, sediment

摘要： 以氯化镁溶液和氢氧化钠溶液为原料制备超细氢氧化镁阻燃剂，在制备氢氧化镁浆料时添加表面改性剂硬脂酸、硬脂酸钠、钛酸丁酯和葡萄糖及其复配改性剂进行在线改性，在改善超细氢氧化镁表面性能的同时提高其过滤性能，并考察表面改性对氢氧化镁浆料沉降效果的影响。实验结果表明：以硬脂酸、硬脂酸钠、钛酸丁酯和葡萄糖作改性剂时，滤饼比阻相比未添加表面改性剂时分别减小了58.27%、41.42%、53.23%和51.93%；沉降速率从未添加表面改性剂时的6.645×10?7m/s分别增大至1.25×10?5m/s、0.667×10?5m/s、1.025×10?5m/s和1.104×10?5m/s。若将改性剂进行复配使用，效果比单独使用其中任何一种都要好。

关键词: 超细氢氧化镁, 表面改性剂, 过滤, 沉降