Insulated wire and preparation method thereof, coil and electronic/electrical device

A preparation method of an insulated wire, the insulated wire comprising a conductor as well as a bonding layer and a PEEK resin sequentially arranged on the outer side of the conductor, comprising the following steps:

• 1) preparing a diamine monomer solution and an amine monomer solution mixing diamine monomer with a solvent, and under a nitrogen protected atmosphere, stirring and mixing till the diamine monomer is completely dissolved so as to obtain the diamine monomer solution;
• mixing an amine monomer with a solvent, and under a nitrogen protected atmosphere, stirring and mixing till the amine monomer is dissolved or completely mixed so as to obtain the amine monomer solution, wherein the amine monomer structurally contains one or two amino groups, and contains 2-12 carbon atoms;
• 2) Mixing a dianhydride monomer with the diamine monomer solution, under a nitrogen protected atmosphere, stirring to react completely so as to obtain a polydietheretheramide acid solution;
• 3) Mixing the polydietheretheramide acid solution with the amine monomer solution, stirring to react completely, adjusting the solid content and viscosity of the reaction liquid so as to obtain a polydietheretheramide acid finished product;
• 4) Coating the conductor with the polydietheretheramide acid finished product, heating to 200-300 DEG C. to react, and after the reaction is completed, further heating to 345-480 DEG C. to react, and after the reaction is completed, coating the surface of a lead to form an insulated wire bonding layer so as to obtain a core wire;
• 5) Extruding a molten PEEK resin material onto the outer surface of the bonding layer of the core wire to form a PEEK resin insulating layer, thereby obtaining the insulated wire;
• wherein the mole ratio of the dianhydride monomer to the diamine monomer is 1:(0.8-1);
• wherein the amine monomer comprises one or more of ethylamine, propylamine, butylamine, aniline, naphthylamine and benzidine;
• when the amine monomer contains two amino groups, the mole ratio of the dianhydride monomer to the amine monomer is 1:(0.02-0.075);
• and
• when the amine monomer contains one amino group, the mole ratio of the dianhydride monomer to the amine monomer is 1:(0.05-0.15);
• wherein the diamine monomer comprises one or more of 4,4′-bis(4″-amino phenoxy) diphenyl ketone, 2,2-bis[4′-(4″-amino phenoxy) phenyl] propane, 1,3-bis(4′-amino phenoxy) benzene and 1,4-bis(4′-amino phenoxy) benzene;
• and
• wherein the dianhydride monomer comprises one or more of bisphenol A dianhydride, 3,3′,4,4′-diphenyl ether dianhydride and 3,3′,4,4′-triphenyl diether tetracarboxylic dianhydride.