Effect of Unhydrated Aminopropyl Triethoxysilane Modification on the Properties of Calcined Kaolin

Unhydrated aminopropyl triethoxysilane was used to modify calcined kaolin produced from coal-bearing kaolinite. The aim develop a simple and economic modification method without the need for solution immersion subsequent wastewater treatment. samples before after were tested using multiple methods, such as XRD, MAS-NMR, FT-IR, XPS, SEM. study results indicate that this can effectively improve surface property of kaolin. activity index increased 76.7% when modifier usage 2%. With further increase in content, decreased. Surface did not reduce whiteness Further, reaction mechanism elucidated. Based on detailed analyses, it found took place between NH2 groups molecules AlVI-OH kaolin, hydrogen bonds formed active sites surface.