摘要：为了获得疏水性好的高品质硫酸钙晶须,以硬脂酸钠为表面改性剂对硫酸钙晶须在制备过程中的表面改性进行研究,考察硬脂酸钠的加入方式对硫酸钙晶须晶体生长及表面改性效果的影响。结果表明:在晶须生长之前,如果硬脂酸钠的质量分数大于0.02%,将导致硫酸钙晶体呈块状,长径比较小;晶须生长之后加入硬脂酸钠,能得到长径比较大的硫酸钙晶须产品;随着硬脂酸钠用量的增大,硫酸钙晶须的活化指数增大,改性效果更好;水热合成反应前、后加入改性剂硬脂酸钠对硫酸钙晶须产品的改性效果影响不大。

关键词：硫酸钙晶须；表面改性；活化指数

Abstract： To obtain the products of high quality calcium sulfate whiskers with better hydrophobicity, surface modification of calcium sulfate whiskers during preparation process was investigated using sodium stearate as the surface modifier. The influence of modifier amount and adding style on the effect of modification was studied. The results show that the products are blocky shaped with smaller ratios of length-to-diameter when the mass fraction of sodium stearate is larger than 0.02% before hydrothermal synthesis reaction of calcium sulfate whiskers. Calcium sulfate whiskers with larger ratios of length-to-diameter can be obtained by adding sodium stearate after hydrothermal synthesis reaction of calcium sulfate whiskers . With the increase of modifier amount, the activating indexes increases and the modification effect of calcium sulfate whiskers is better. The adding styles of sodium stearate i.e. adding before and after hydrothermal synthesis reaction have little influence on the modification effect of calcium sulfate whiskers. 

Keywords: calcium sulfate whisker; surface modification; activating index