硬脂酸对三水碳酸镁晶须表面改性的研究

采用硬脂酸对三水碳酸镁晶须进行了表面改性，考察了改性剂用量、料浆浓度、改性时间等因素对三水碳酸镁晶须表面改性的影响.采用接触角、活化指数、扫描电子显微镜、热重分析和红外光谱分析对改性前后的三水碳酸镁晶须进行表征.结果表明，最佳改性条件为改性剂用量5%，料浆质量分数5%，改性时间60min.在最佳工艺条件下，改性产品的接触角为130°，活化指数为1.000.表面改性过程对三水碳酸镁晶须的热分解没有明显影响.硬脂酸与三水碳酸镁晶须的结合方式主要是镁离子与羧基形成憎水性的硬脂酸镁保护层.

Surface Modification of Nesquehonite Whiskers with Stearic Acid

Surface modification of the nesquehonite whiskers with stearic acid was studied， surface modification effect of stearic acid dosage， slurry concentration and modification time was investigated on the nesquehonite whiskers. Modified nesquehonite whiskers were characterized with contact angle， activation index， SEM， TG-DSC and FTIR. The results indicated that the best process condition was modifier dosage of 5%， slurry concentration of 5% and modification time of 60min. Under the optimum condition， contact angle of modified product is 130° and activation index is 1.000. There is no distinct effect of surface modification on the thermal decomposition of nesquehonite whiskers. The interlinkage between the stearic acid and nesquehonite whiskers is mainly caused by hydrophobic magnesium stearate films formed by magnesium ions and carboxyl groups.