司班表面活性剂对氢氧化铝表面改性的研究

Research on surface modification of aluminum hydroxide by surfactants of Span

对司班表面活性剂湿法改性氢氧化铝的工艺条件进行了探讨,并利用接触角测试、粒径分析、红外光谱(IR)及热重-差示扫描量热(TG-DSC)等测试表征手段,对氢氧化铝的改性效果进行了分析。结果表明,改性剂用量、改性温度及时间等工艺条件对氢氧化铝的改性效果有显著影响,且不同司班表面活性剂对应的最佳工艺条件也有差别,其中以S-60作为改性剂,在用量为0.03(与氢氧化铝的质量比),温度为85℃时,经60 min改性得到的氢氧化铝效果最好。通过改性,氢氧化铝的粒径分布变得更加均匀,颗粒表面的润湿性由亲水转变为亲油。司班表面活性剂主要通过物理吸附作用实现对氢氧化铝的改性,因此氢氧化铝的化学结构没有发生变化,热稳定性也未受到明显影响。

Surface modification process of aluminum hydroxide by wet method with the surfactants of Span was studied. Meanwhile ,the surface modification effect was analyzed by the means of the water contact angle test,IR,particle size distri- bution, TG-DSC and so on.Results showed that the conditions, such as amount of modifier, modifying temperature, and modi- fying time, had a significant influence on the modification effect of aluminum hydroxide, and there were differences between the surfactants of Span and the corresponding optimum conditions, especially S-60 which as the modifying agent, could been got the best modifying effect of aluminum hydroxide under the conditions as follow：amount of 0.03 （the mass ratio of modifier to aluminum hydroxide）, reaction temperature of 85 ~C, and reaction time of 60 min.By modifying, aluminum hydroxide parti- cle size distribution became more uniform, the surface wettability of the particles changed from hydrophilic to lipophilic.The surface modification of aluminum hydroxide by the surfactants of Span was mainly achieved through physical adsorption, so the chemical structure of aluminum hydroxide has not been changed, and the thermal stability was not significantly affected.