Preparing method of nylon bonded Nd-Fe-B magnet

The invention discloses a preparing method of nylon bonded Nd-Fe-B magnet, belonging to the preparing method of bonded Nd-Fe-B permanent magnet material and aiming at solving the problems of high nylon content and low injection pressure in the current injection moulding method to reduce the nylon content in the nylon bonded Nd-Fe-B magnet, thereby increasing the magnetic performance and mechanical property of the nylon bonded Nd-Fe-B magnet. The invention comprises the following steps: surface modifying process, moulding, curing process, surface treatment and magnetizing. In the nylon bonded isotropic Nd-Fe-B magnet prepared by the invention, the content of nylon is 4.5wt%, the flexural strength is 84.7 MPa, the compressive strength is 138 MPa, the residual magnetism is 0.688 T, the intrinsic coercivity is 782 kA/m, and the magnetic energy product is 74.1 kJ/m; compared with traditional injection moulding method, the invention is featured by high performance, simple preparing method, economic practicability, easy realization of industrialized mass production and good popularization and application prospect.