摘要：采用硬脂酸对三氧化二铬颗粒进行表面改性,探讨改性条件对改性效果的影响,并通过活化指数、接触角、红外光谱、X射线衍射、差热分析等测定对改性效果进行表征。结果表明,三氧化二铬表面改性的最佳工艺条件为:改性剂硬脂酸质量分数为2%,改性温度为80℃,改性时间为40 min;硬脂酸在三氧化二铬表面发生吸附键合,形成新的化学键,但未破坏三氧化二铬的晶体结构;改性后,三氧化二铬与水的接触角达145°,其表面性质由亲水变为疏水。

关键词：硬脂酸；表面改性；疏水性

Abstract：The surface modification of chromium sesquioxide by stearic acid was investigated,and the results of the modification were characterized by means of the determination of activation index,angle of contact and FT-IR,XRD,TG-DSC.The results show that the optimum technical condition is 2% in dosage,80℃ in temperature and 40 min in time.The stearic acid molecules adsorb on the surface of chromium sesquioxide chemically,and new bonds form.The surface modification do not destroy the crystal structure of chromium sesquioxide.The contact angle of the modified chromium sesquioxide with water is 145°,which indicates that the surface of chromium sesquioxide changes from hydrophilic to hydrophobic after stearic acid modification.

Keywords：stearic acid；surface modification；hydrophobic