Flexible permanent magnetic material, preparation method and application thereof in magnetic biological effect products

A method for preparing a flexible permanent magnetic material, comprising:

• (1) mixing raw materials according to parts by weight, followed by carrying out defoaming treatment to remove gas in a mixture;
• wherein the raw materials comprise:
• 0-70 parts by weight of anisotropic neodymium iron boron powder, 0-40 parts by weight of anisotropic samarium iron nitrogen powder, 3-20 parts by weight of a binder, clay powder, zinc stearate, a dispersant and a lubricant;
• wherein the anisotropic neodymium iron boron powder and the anisotropic samarium iron nitrogen powder are not 0 at a same time;
• wherein the binder is two-component food-grade silica gel;
• and
• wherein the lubricant is conductive carbon powder or graphene with a maximum amount that is 1% of a total mass of the anisotropic neodymium iron boron powder and the anisotropic samarium iron nitrogen powder;
• (2) carrying out pouring treatment at 15-35° C. on the mixture obtained in the step (1) to obtain hybrid magnet blank slurry;
• and
• (3) pouring the hybrid magnet blank slurry into a mold, heating while applying a magnetic field to upper and lower surfaces of the mold, then removing the magnetic field, and demoulding to obtain the flexible permanent magnetic material;
• wherein a magnetic field intensity does not exceed 5000 gausses;
• wherein after the heating in the step (3), a system temperature is 80-150° C., and a heating duration is 1-8 h;
• and the mold is made of a non-magnetic conductive material.