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

A method for preparing an insulated wire, comprising:

• step 1, applying a bonding agent to a surface of a conductor to form a bonding layer covering the conductor and obtain a core wire;
• and
• step 2, extruding a PEEK resin material outside the bonding layer of the core wire to form a PEEK resin insulating layer and obtain an insulated wire;
• in step 1, the bonding agent is prepared by the following steps:
• dissolving polyamide-imide resin in the organic solvent, and heating and stirring the solution;
• and
• adding the PEEK nano-powder material and dissolving the solution under stirring to obtain the bonding agent;
• the bonding agent comprises, based on parts by weight, 50-80 parts of organic solvent, 20-30 parts of polyamide-imide resin and 2-8 parts of PEEK nano-powder material;
• a viscosity at 30° C. of 3,000 cp;
• after the step of adding the PEEK nano-powder material and dissolving the solution under stirring, further comprising:
• adding the organic solvent, and preferably, a mixture of N-methylpyrrolidone and xylene to adjust the solid content and viscosity:
• adding the dispersant, wherein
• the dispersant is selected from one or more of cetyltrimethylammonium bromide, an alkylphenol ethylene oxide condensate emulsifier, sodium dodecyl sulfate, sodium dodecyl sulfonate and sodium dodecylbenzene sulfonate.