摘要：采用硬脂酸对碳酸钡进行表面改性,研究改性剂用量、改性温度和改性时间等因素对碳酸钡表面改性的影响。采用粒度分析、红外光谱、热重分析、扫描电镜、X射线衍射及润湿性实验对改性前后的碳酸钡进行表征。结果表明:在硬脂酸用量为1.5%(质量分数),改性温度为80℃,改性时间为30 min的条件下制备的产品性能优良,活化指数达99.2%。碳酸钡经硬脂酸改性后,粒度由4.56μm减小至4.19μm;硬脂酸在碳酸钡表面发生吸附键合,形成新的化学键;改性后的碳酸钡表面性质由亲水变为疏水。

关键词： 碳酸钡;硬脂酸;表面改性

Abstract： The surface modification of barium carbonate powders by stearic acid was investigated. The impact of modifier dosage， modification temperature and modification time on the surface modification of barium carbonate powders were studied. The unmodified and modified barium carbonate were both tested with the particle size distribution， FTIR， TGDSC， SEM， XRD and the experiments of wettability. The results showed that the products with excellent modification effect as well as 99.2% activation exponential were prepared in the conditions of 80 ℃， with 1.5% stearic acid added （mass fraction） and stirring for 30 min. The particle size of barium carbonate reduced from 4.56 μm to 4.19 μm. The stearic acid molecules occured adsorbing bond on the surface of barium carbonate， forming new chemical bonds， and the surface property of barium carbonate modified with stearic acid was changed from hydrophilicity to hydrophobicity. 

Keywords： barium carbonate； stearic acid； surface modification