Flexible binding neodymium ferroboron magnet and manufacturing method thereof

A manufacturing method, NdFeB technology, applied in the direction of inductance/transformer/magnet manufacturing, magnetic objects, adhesives, etc., can solve the problems of unsatisfactory high-performance micro-motors and low magnetic properties, and achieve low cost and high production efficiency Effect

Inactive Publication Date: 2005-06-08
GUANGZHOU GOLDEN SOUTH MAGNETIC MATERIAL
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AI-Extracted Technical Summary

Problems solved by technology

In the existing large-scale production technology, most of the magnetic powder used is ferrite. Although this type of ferrite bonded magnet has certain oxidation resis...
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Method used

[0020] The magnet formulation ratio (weight ratio) is NdFeB magnetic powder 95%, polyisobutylene rubber 3.5%, ketone amine compound 0.3%, silane coupling agent 0.5%, epoxy resin 0.5%, organic peroxide 0.2%. First mix the magnetic powder with silane coupling agent and epoxy resin evenly to modify the surface of the magnetic powder and have better compatibili...
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Abstract

The invention relates to a flexible bond ndfeb magnet. It is uniformly in proportion mixed by the processed rubber binding agent, ndfeb magnetic powder, and processing agent. The mixture method is adopted banbury mixing, roll mixing, pudding process or screw milling. Then the uniformly mixed rubber material is formed to magnet with certain thickness by rolling and plate pressing. Its each composition weight content is that the ndfeb magnetic powder is from eighty seven percent to ninety seven percent; the modified rubber binding agent is from one percent to eight percent; the processing agent is from zero to five percent. The advantages are high production efficiency, low cost and flexibility and elasticity.

Application Domain

Polyureas/polyurethane adhesivesInorganic material magnetism +2

Technology Topic

Mixed approachMagnetic powder +4

Examples

  • Experimental program(3)

Example Embodiment

[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.

Example Embodiment

[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.

Example Embodiment

[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.

PUM

PropertyMeasurementUnit
Thickness1.0mm
Magnetic energy product5.3mgoe
Tensile strength2.1MPa

Description & Claims & Application Information

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