| 摘要 |
PROBLEM TO BE SOLVED: To enhance dispersibility of magnetic fluid by employing a specified perfluoroetherphosphate compound, together with a perfluoroethercarbonate amide compound when a fluorine based magnetic fluid is produced by dispersing magnetic microparticles into a specified perfluoropolyether based base oil. SOLUTION: The fluorine-based magnetic fluid is produced by dispersing perfluoroether phosphate compound shown by a formula F[CF(CF3 )CF2 O]nCF (CF3 ) (Y)v(R)wO}tPO(OM)u (R is alkylane group, Y is COO group or CONH group, M is an H atom, alkaline metal or ammonium group, n is an integer of 1-100, t is 1 or 2, u is 3-t, v and w are 0 or 1) and a perfluoroethercarbonate amide compound shown by a formula F[CF(CF3 )CF2 O]pCF(CF3 )CONH(CH2 ) qNH2 (p is an integer of 1 or above, q is an integer of 2-20) into a perfluoropolyether-based base oil shown by a formula F[CF(CF3 )CF2 O]mRf (Rf is perfluoroalkyl group, m is an integer of 1 or above). |
