纳米氢氧化镁的制备及其原位改性

Preparation and in situ modification of magnesium hydroxide nanoparticles

以六水氯化镁为原料,氢氧化钠为沉淀剂,采用双向沉淀法,在制备过程中引入表面活性剂制备表面有机化的纳米氢氧化镁,同时提高氢氧化镁浆料的沉降性能。以吸油值、接触角衡量氢氧化镁的改性效果,考察了表面活性剂对氢氧化镁改性效果及氢氧化镁浆料沉降性能的影响。利用纳米粒度仪和红外光谱仪对产物的粒径和结构进行表征。结果表明,不同的表面活性剂对氢氧化镁的改性作用存在一定的差别。在制备过程中,油酸的引入对氢氧化镁的改性效果最好,改性后氢氧化镁的接触角和吸油值明显提高,同时改善了氢氧化镁浆料的沉降性能。FTIR分析证明油酸成功地吸附在氢氧化镁表面。

Surface organic magnesium hydroxide nanoparticles were prepared by one-step double precipitation method with surfactant and using magnesium chloride hexahydrate as raw material and sodium hydroxide as precipitant. Moreover,the settlement property of the magnesium hydroxide slurry were improved. The oil absorption and contact angle were selected as parameters to characterize the effect of surfactant on the modified magnesium hydroxide and its slurry＇s settlement property. The particle size and molecular structure were characterized by laser particle size analyzer（LPSA）and Fourier transform infrared spectrometer（FTIR）,respectively. Experimental results indicated that the magnesium hydroxides modified by different surfactant were different. Among the surfactants,OA was the best for the modification of magnesium hydroxide,because the oil absorption and contact angle were significantly increased,and the settlement property was improved after OA modification. FTIR results indicated that OA had indeed been bonded on the surface of magnesium hydroxide.