超细CaCO_3的硅烷偶联剂表面化学修饰研究

Study on Surface Chemical Modification of Ultra Fine CaCO_3 with Silane Coupling Agent

为了改善超细CaCO3粉体的表面活性,利用γ-氨基丙基三乙氧基硅烷偶联剂(KH-550)对超细CaCO3粉体进行表面修饰。利用红外光谱(FTIR)、热重分析(TGA)、扫描电子显微分析(SEM)、接触角测定仪和沉降实验等方法对改性前后超细CaCO3粉体进行了表征。实验结果表明:KH-550与超细CaCO3能够形成化学结合,表面修饰后的超细CaCO3粉体颗粒能有效阻止颗粒的团聚,并能均匀分散在胶体中,与胶体形成物理和化学交联结构。

In order to increase the superficial capacity of ultra fine calcium carbonate（CaCO3）,γ-aminopropyltriethoxylsilane coupling agent（KH550） was used as modifier for surface modification of ultra fine CaCO3.The modified and unmodified ultra fine CaCO3 powder were characterized by Fourier Transform Infrared Spectroscopy（FTIR）,thermogravimetric analysis（TGA）,scanning electron microscopy（SEM）,contact angle measuring instrument,sedimentation test and so on.Results showed that KH-550 can form chemical union with ultra fine CaCO3.The agglomeration of ultra fine CaCO3 particles was effectively restricted after surface modification.The modified ultra fine CaCO3 particles can be dispersed equally in rubber and form physical and chemical crosslinking structure with rubber.