硫酸钙晶须表面湿法改性研究

采用几种表面改性剂对硫酸钙晶须表面进行了湿法改性试验,选出了改性效果较好的硬脂酸对硫酸钙晶须进行了单因素条件改性试验,分别考察了改性剂用量、初始料浆浓度、改性温度、改性时间、搅拌速率、烘干温度、烘干时间等因素对硫酸钙晶须表面改性的影响;改性硫酸钙晶须产品采用活化指数、接触角、扫描电子显微镜、X射线衍射和红外光谱分析进行表征。试验结果表明:硬脂酸对硫酸钙晶须的改性效果较好,在最佳工艺条件下,改性产品的活化指数为1.00,接触角为123.6°。建立了硬脂酸与硫酸钙晶须的作用模型。

RESEARCH ON SURFACE MODIFICATION OF CALCIUM SULPHATE WHISKERS

In this paper,several kinds of surfactants are chosen to perform wet modification experiments of calcium sulphate whiskers,then stearic acid,which displayed better modification effect than others,is used to do the modification experiments of calcium sulphate whiskers on the condition of single factors.Influences of technical factors such as surfactant dosage,initial slurry concentration,modification temperature,modification time,stirring speed,drying temperature,drying time on surface modification of calcium sulphate whiskers are studied respectively.Modified calcium sulphate whiskers are characterized with active exponent,contact angle,SEM,X-ray diffraction and IR respectively.The results indicate that stearic acid has good effect on surface modification of calcium sulphate whiskers.Under the optimum condition,active exponent of modified product is 1.00 and contact angle is 123.6°.