Study On Surface Modification Of Micro-crystal Muscovite By Amino Silane [C₃H₆(NH₂)Si(OC₂H₅)₃]

As a new kind of muscovite group minerals found in west Sichuan area, micro-crystal muscovite not only has excellent physical and chemical properties of muscovite group minerals, but also has properties of natural ultra-fine, easy comminution and easy processing, so it has wide exploitation and application prospect in application domains of many polymer materials. In order to solve compatibility between micro-crystal muscovite powder and polymer materials, and fully play an role of functional powder fillings, surface modification of micro-crystal muscovite powder must be carried out. Base on these aspects, this dissertation studies and discusses systematically preparation technology conditions, characterization methods of modification effect and modification mechanism of micro-crystal muscovite functional fillings surface modified by amino silane C3H6(NH2)Si(OC2H5)3 (KH— 550). We got the the results as following.In preparation process, temperature-controlled high-speed mixer was used and surface modification technology of dry method was adopted. We mainly study on temperature, modification time, dosage of coupling reagent and diluent, when micro-crystal muscovite powder is modified by silane KH—550. The conmparision among the permeable time method, viscidity method and IR method were made, which can pre-assess modification effect. We found that modification effect of micro-crystal muscovite powder modified by amino silane KH — 550 can be effectively characterized by permeable time method. With the permeable time as a main characterization method, we studied on modification technology conditions. The conclusions are as following: (1)The temperature and the modification time of modification of micro-crystal muscovite powder by KH—550 are 100℃—110℃ and 50—60 min respectively. When modification temperature is excessively low, the energy for surface modification can not be provided sufficently . When modification temperature is excessively high, silanols maybe volatilize. When modification time is too short, the materiel will mix asymmetricly. When modification time is too long, the materiel will segregate and result in energy waste. (2) There is an ideal silane dosage value Gt for the surface modification of one kinds of mineral powder. Taking Gt as the turning point, before amino silane dosage is less than Gt, maybe the process is a...