Polyamide magnetic particle preparation method and polyamide magnetic particle obtained by same

The invention discloses a polyamide magnetic particle preparation method and a polyamide magnetic particle obtained by the same. The method includes: step 1, adding polyamide into first solvent, and adding a magnetic material to obtain first solution; step 2, mixing the first solvent with second solvent to obtain second solution, and dropwise adding the second solution into the first solution under a condition of stirring to obtain third solution; step 3, dropwise adding the second solvent into the third solution under the condition of stirring; step 4, performing aftertreatment to obtain thepolyamide magnetic particle in a particle size of 10-500nm. According to the method, different solvents are adopted for fractional precipitation to obtain the small-size polyamide magnetic particle, the obtained polyamide magnetic particle is small in particle size and magnetic and can be used for adhesion of cracks, and movement of the particle can be controlled through a magnetic field. 本发明公开了种聚酰胺磁性颗粒的制备方法及得到的聚酰胺磁性颗粒，其中