| 摘要 |
PURPOSE:To elevate dispersion stability, and improve low torque, cold resistance, chemical resistance, and insulation property, and besides, remove the compatibility with water, etc., by silicifying ferromagnetic substance fine particles with fluorosilicon oligomer. CONSTITUTION:A fluorosilicon group is introduced into the surface of a ferromagnetic substance fine particle by silicifying a ferromagnetic fine particle such as magnetite, etc., with specified fluorosilicon oligomer. Next, this fluorosilicon ferromagnetic substance fine particle obtained is thrown in a low boiling point fluoric solvent so as to do cracking with a crusher. Next, a perfluoro solvent such as a kind of perfluoropolyether, etc., is added and is agitated and dispersed. Then, the low boiling point fluoric solvent is removed by heating the dispersed solution. Here, at need, an interface activator is added. Hereby, dispersion stability ups, and besides heat resistance and mechanical strength increases, and mechanical strength also increases, and besides compatibility to water and hydrocarbon oil can be removed. |
