采用TURBISCAN LAB稳定性分析仪研究拟薄水铝石溶胶稳定性

摘要

The stability of pseudo-boehmite sol was studied by using TURBISCAN Lab Dispersion Steady Indicator.The effect of various acidic peptizing agents, peptizing temperature, sol solid content and peptizing time on the stability of pseudo-boehmite sol was investigated, and a stability parameter was introduced to characterize the stability of sol system.Test results show that the pseudo-boehmite sol sample obtained by using hydrochloric acid as peptizing agent is more stable than that of using nitric acid.With the increase of peptizing temperature and peptizing time, the stability parameters of pseudoboehmite sol increase, indicating that the sol system becomes unstable.The peptizing of pseudo-boehmite is an endothermic reaction;peptizing reactions proceed with the increase of temperature, which could be seen from the changes of sol particle size, specific surface area and the space between sol particles with temperature.In some extent, the nano-scale pseudo-boehmite sol is a thermodynamically unstable system as shown by the increase of stability parameter with peptizing time.%利用TURBISANLAB稳定性分析仪研究了拟薄水铝石溶胶的稳定性,考察了酸胶溶剂类型、胶溶温度、固含量及胶溶时间对拟薄水铝石溶胶稳定性的影响,并引入稳定性参数的概念来表征溶胶体系的稳定性.结果表明:拟薄水铝石完全胶溶时,盐酸胶溶得到的溶胶较硝酸胶溶得到的稳定;胶溶温度和胶溶时间的增加都会导致拟薄水铝石溶胶的稳定性参数值逐渐增大,表明体系趋于不稳定;溶胶粒径、溶胶粒子的比表面积、溶胶粒子间距离随温度的变化证明拟薄水铝石酸化胶溶是一个吸热反应,胶溶温度的升高促进了胶溶反应的进行;随胶溶时间的增加,拟薄水铝石溶胶的稳定性参数值逐渐增大,在一定程度上说明纳米级的拟薄水铝石溶胶分散体系在热力学上是不稳定体系.