ZnO微粉在水体系中的分散性能

Dispersion properties of micropowder zinc oxide in aqueous system

以质量分数为10%的ZnO水悬浮液为研究对象,采用机械搅拌与分散剂分散相结合的方法,以重力沉降法为表征手段,研究不同工艺参数对ZnO微粉分散效果的影响,并初步探讨了作用机理.实验结果表明:当分散时间为1 h,分散速度3 000 r/min,pH为11时均能得到较好的分散效果.对比3种不同类型的分散剂发现,加入质量分数为0.1%的阴离子表面活性剂十二烷基苯磺酸钠(SDBS)时,悬浮液的稳定性最佳.通过激光粒度仪分析得出,较未分散的ZnO微粉,颗粒的平均粒径从16.191μm降低到0.311μm,颗粒尺寸较小,团聚现象得到明显的改善.

The important factors affecting the dispersion of ZnO in water were investigated by using 10% ZnO soliquoid.Both mechanic agitation and dispersant were used to investigate the dispersion of ZnO micropowder on different process condition by the gravitational sedimentation method.The experimental results showed that the desirable dispersion could be obtained under the following experimental conditions：1 h of dispersion time,3000r/min of dispersion rate,as well as the pH value of 11 in water.The stability of the suspension was the best when 0.1% of SDBS,a kind of anionic surfactant,was added into the suspension after three different dispersants were used.It was found that the average particle size of the micropowder was decreased from 16.191μm to 0.311μm by the laser particle size analysis.The agglomeration of the ZnO micropowder was obviously alleviated because of the smaller particle size.