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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI 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 resistance and good mechanical properties, its magnetic properties are low and cannot meet the high requirements. Performance micro motor and other application requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

Embodiment 2

[0020] The formula ratio (weight ratio) of the magnet is 95% of NdFeB magnetic powder, 3.5% of polyisobutylene rubber, 0.3% of ketoneamine compound, 0.5% of silane coupling agent, 0.5% of epoxy resin and 0.2% of 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 knead the magnetic mixture evenly on the screw mixer, and finally make the thickness on the calender 1.0mm magnetic sheet. The magnetic sheet is thermally crosslinked, the crosslinking condition is 130°C*15min, the magnetic energy product of the tested magnetic sheet is 8.5MGOe, and the tensile strength of the magnetic sheet is 4.0MPa.

Embodiment 3

[0022] The magnet formula ratio (weight ratio) is 95% of anisotropic NdFeB magnetic powder, 2.0% of nitrile rubber, 1.5% of thermoplastic elastomer, 0.3% of ketone amine compound, 0.5% of silane coupling agent, 0.5% of epoxy resin, organic Peroxide 0.2%. First mix the magnetic powder with the silane coupling agent and epoxy resin evenly, blend the rubber with the thermoplastic elastomer evenly and heat plasticize, then knead the magnet mixture evenly on the screw mixer, and finally make it on the flatbed machine with a thickness of 1.0 mm magnetic sheet, there is an external magnetic field when the tablet is pressed, and the magnetic sheet is heated and thermally cross-linked at the same time. 3.8MPa.

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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.

Description

technical field [0001] The invention relates to a bonded rare earth permanent magnet material, and also relates to a manufacturing method of the bonded rare earth permanent magnet material. Background technique [0002] In the past, the processing methods of bonded rare earth magnets mostly used molding, injection and extrusion processes, and the magnets produced were rigid and inelastic. However, the molding and injection molding processes required a large number of molds of different specifications, and in the later stage. Dimensions are machined, which is not conducive to the change of magnet specifications, and the processing cost is relatively high. At the same time, although rigid magnets have high magnetic properties and a certain degree of freedom in shape, they have disadvantages such as low degree of automation and inconvenient assembly in motor applications, and it is difficult to make magnets with ultra-thin thickness (less than 1.0mm). [0003] Flexible bonded ...

Claims

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Application Information

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IPC IPC(8): C09J109/00C09J123/00C09J175/00C09J183/00H01F1/057H01F1/08H01F41/02
Inventor 范保顺汪小明戴雨兰王伟徐各清饶钦盛
Owner GUANGZHOU GOLDEN SOUTH MAGNETIC MATERIAL
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