摘要：采用KBM-573硅烷偶联剂对球形硅微粉表面进行水解改性,通过控制改性时间、改性温度和改性剂用量确定最佳工艺参数;利用红外光谱、SEM对改性前、后的球形硅微粉性能进行表征,同时测定改性前、后样品的吸油值和表面羟基数量,分析其改性效果;并进行PTFE覆铜板指标测试。结果表明:改性后的球形硅微粉吸油值明显减小,表面羟基数大幅减少,硅烷偶联剂分子成功地以化学键的形式接枝在球形硅微粉表面;改性后球形硅微粉团聚现象减少,分散性得到显著改善; KBM-573改性球形硅微粉与KH550改性同类产品相比,具有更好的耐热性及应用性能。

关键词：球形硅微粉；硅烷偶联剂；表面改性；覆铜板

Abstract: The modification of spherical silica powder with silane coupling agent KBM－573 under hydrolysis conditions was reported． The optimum process parameters were obtained according to the investigation of modificaiton time，modification temperature and modifier dosage． The characterization of spherical silica powder before and after modification were conducted． The indicators of PTFE copper clad laminates tests were executed． The results show that both of the content of surface hydroxyl and oil absorption value of the modified spherical silica powder decrease obviously，indicating that KBM－573 is grafted on the surface of spherical silica powder by chemical bonds successfully． Besides，the spherical silica powder after modification show significantly increase dispersivity． In addition，the spherical silica powder modified with KBM－573 show better heat resistance and application performance than that of KH550． 

Keywords: spherical silica powder; silane coupling agent; surface modification; copper clad laminate