Preparation method of composite coating for directionally arranging magnetic filler in coating under action of electromagnetic field

The invention discloses a preparation method of a composite coating for directionally arranging a magnetic filler in the coating under the action of an electromagnetic field, which comprises the following steps: S1, carrying out surface etching on a flaky filler, and modifying the flaky filler by using a silane coupling agent; s2, mixing the modified flaky filler obtained in the step S1 with ethylene glycol, then adding sodium acetate, FeCl3. 6H2O and polyethylene glycol, and carrying out high-temperature (200-250 DEG C) reaction; and S3, dispersing the flaky filler obtained in the step S2 in an organic solvent, then mixing the flaky filler with organic resin and a curing agent, carrying out vacuum defoaming, then carrying out coating, and putting the mixture into a solenoid magnetic field before curing so as to obtain a magnetic filler reinforced composite coating, and carrying out horizontal directional arrangement on the magnetic filler reinforced composite coating. According to the preparation method, the