Flexible binding neodymium ferroboron magnet and manufacturing method thereof

[0017] Example 1

[0018] The magnet formula ratio (weight ratio) is 90% NdFeB magnetic powder, 8% polyisobutylene rubber, 0.7% epoxy soybean oil, 0.3% ketamine compound, 0.5% silane coupling agent, and 0.5% epoxy resin. First mix the magnetic powder, silane coupling agent and epoxy resin evenly, then mix the magnet mixture uniformly on an open mill, and finally make a magnet with a thickness of 1.0mm on a calender. The magnetic energy product of the test magnet is 5.3MGOe , The tensile strength of the magnetic sheet is 2.1MPa.

[0019] Example 2

[0020] The magnet formula ratio (weight ratio) is 95% NdFeB magnetic powder, 3.5% polyisobutylene rubber, 0.3% ketone amine compound, 0.5% silane coupling agent, 0.5% epoxy resin, and 0.2% organic peroxide. First mix the magnetic powder with silane coupling agent and epoxy resin evenly to modify the surface of the magnetic powder and have better compatibility with rubber, then mix the magnet mixture uniformly on the screw mixer, and finally make the thickness on the calender It is a 1.0mm magnet. The magnetic sheet is thermally cross-linked, and the cross-linking condition is 130℃*15min. The magnetic energy product of the tested magnetic sheet is 8.5MGOe, and the tensile strength of the magnetic sheet is 4.0MPa.

[0021] Example 3

[0022] The magnet formula ratio (weight ratio) is 95% anisotropic NdFeB magnetic powder, 2.0% nitrile rubber, 1.5% thermoplastic elastomer, 0.3% ketone amine compound, 0.5% silane coupling agent, 0.5% epoxy resin, organic Peroxide 0.2%. First, the magnetic powder, silane coupling agent and epoxy resin are mixed uniformly, rubber and thermoplastic elastomer are blended uniformly and thermally plasticized, and then the magnet mixture is uniformly mixed on the screw mixer, and finally the thickness is 1.0 on the flat plate machine. mm magnetic sheet, there is an external magnetic field when the tablet is pressed by the flat machine, the magnetic sheet is heated and cross-linked at the same time, the cross-linking condition is 140℃*10min, the magnetic energy product of the tested magnetic sheet is 11.7MGOe, and the tensile strength of the magnetic sheet is 3.8MPa.