| 摘要 |
PURPOSE:To obtain fluorinated magnetic fluid composition having excellent dispersion stability by using as a surfactant perfluoroalkyl phosphoric acid ester or its salt or perfluoroalkyl sulfonic acid or its salt. CONSTITUTION:A surfactant for dispersing ferromagnetic fine particles of fluorine magnetic fluid composition is selected from at least one of perfluoroalkyl phosphoric acid ester or its salt, and perfluoroalkyl sulfonic acid or its salt. Since the surfactant has high dissolution in acidic solution, when it is added in an acidic state, it is completely dissolved. Further, zeta potential of colloidal particles becomes positive, and the particles are preferably attracted to magnetic particles. Thus, an optimum fluorine magnetic fluid as an aerospace sealant having good lubricating characteristic at low vapor pressure and excellent dispersion stability can be obtained. |
