MAGNETIC FLUID
- 申请公布号:
- JPH05299231(A)
- 申请号:
- JP19920097686
- 申请日期:
- 1992.04.17
- 申请公布日期:
- 1993.11.12
- 申请人:
- DAIKIN IND LTD
- 发明人:
- YOSHINO NORIO
- 分类号:
- H01F1/34;H01F1/44
- 主分类号:
- H01F1/34
- 摘要:
- PURPOSE:To manufacture the magnetic fluid capable of reforming the magnetic powder surface thereby stably maintaining the dispersed state in fluorine oil whereinto the reformed magnetic powder is dispersed by using a specific fluorine compound as an interfacial activator. CONSTITUTION:The magnetic fluid is composed of a fluorine compound, magnetic powder and fluorine oil represented by a structural formula wherein Rf represents perfluoroalkyl radical in carbon number of 1-10 while n represents 1-3. At this time, a small quantity of fluorine compound having so high interfacial activating effect can efficiently reform the magnetic lowder surface. Besides, since the reformed magnetic powder can be dispersed into a fluorine oil, the title fluid can stably maintain the dispersed state of the magnetic powder. Furthermore, the fluorine oil can be used as a medium of the magnetic fluid so that excellent thermal resistance, cold resistance, chemical resistance of the magnetic fluid can be assured.
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