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Preparation of ferrite magnetic spliced magnet having great processability

A technology of bonded magnets and processing performance, applied in the direction of magnetic objects, magnetic materials, circuits, etc., can solve the problems of reducing melt fluidity, achieve low price, easy injection molding, and do not reduce the effect of mechanical and magnetic properties

Inactive Publication Date: 2009-02-11
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to ensure that the bonded magnet has sufficient mechanical properties, the bonded magnet generally uses high-strength engineering plastics such as nylon, polycarbonate, polyphenylene sulfide and polyimide as the binder. In order to obtain higher magnetic properties, and It is required to increase the loading of magnetic powder, which will undoubtedly reduce the fluidity of the melt

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The magnetic powder is strontium ferrite powder with an average particle size of 2-5 μm, and its mass accounts for 79.21% of the total mass of the bonded magnet. Oxyacetate bis(dioctyl phosphate) titanate is selected as the magnetic powder modifier, and its mass accounts for 0.79% of the total mass of the bonded magnet; the processing aid is selected from ethylene bis stearamide, and its mass accounts for 0.79% of the bonded magnet's total mass; 1% of the total mass; add the mixture together with caprolactam, caprolactam sodium salt and sodium hydroxide accounting for 19% of the total mass of the bonded magnet to the pretreatment tank, seal the feeding port, and then vacuumize. Raise the temperature of the pretreatment tank to 100°C while stirring the materials. This process lasts for 2 hours, then press a certain amount of nitrogen (the internal pressure is controlled at 0.01MPa) as a protective atmosphere, and then continue to add a certain amount of 2,4-2 toluene di ...

Embodiment 2

[0027] The magnetic powder is strontium ferrite powder with an average particle size of 2-5 μm, and its mass accounts for 79.21% of the total mass of the bonded magnet. The magnetic powder modifier selects tetraisopropyl bis(dioctyl phosphate) titanate, and its mass accounts for 0.79% of the total mass of the bonded magnet; the processing aid selects aluminum stearate, and its mass accounts for 0.79% of the total mass of the bonded magnet. 1%; the mixture, 19% of the total mass of the bonded magnet, cyclododecamide, cyclododecamide sodium salt, and sodium hydroxide are added to the pretreatment tank, and the feeding port is sealed, and then vacuumed. Raise the temperature of the pretreatment tank to 100°C while stirring the materials. This process lasts for 2 hours, and then press a certain amount of nitrogen (the internal pressure is controlled at 0.01MPa) as a protective atmosphere, and then continue to add a certain amount of 2,4-2 toluene di isocyanate), and continued to s...

Embodiment 3

[0029] The magnetic powder is strontium ferrite powder with an average particle size of 2-5 μm, and its mass accounts for 79.21% of the total mass of the bonded magnet. The magnetic powder modifier selects tetraisopropyl bis(dioctyl phosphate) titanate, and its quality accounts for 0.79% of the bonded magnet total mass; the processing aid selects 3-phenoxy-4-fluorobenzaldehyde for use, and its mass Accounting for 1% of the total mass of the bonded magnet; adding the mixture together with 19% of the total mass of the bonded magnet, cyclononamide sodium salt and sodium hydroxide to the pretreatment tank, sealing the feeding port, and then vacuuming . Raise the temperature of the pretreatment tank to 100°C while stirring the materials. This process lasts for 2 hours, and then press a certain amount of nitrogen (the internal pressure is controlled at 0.01MPa) as a protective atmosphere, and then continue to add a certain amount of 2,4-2 toluene di isocyanate), and continued to st...

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PUM

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Abstract

The invention relates to a ferrite bonded magnet with good processing characteristics, which can retain excellent high temperature fluidity without losing magnetic characteristics and mechanical strength. The ferrite bonded magnet is prepared by the steps as follows: adding isotropic strontian ferrite magnetic powder, thermoplastic resin (nylon) monomer, a sodium salt, a processing assistant and a magnetic powder modifier into a pretreatment kettle according to a certain proportion, and vacuuming; heating the pretreatment kettle while stirring the materials for a while, introducing a certain quantity of nitrogen gas under pressure, adding a certain quantity of an activator, and stirring for a while to obtain a compound pre-polymer; and delivering the pre-polymer into a double screw extrusion machine to conduct conveying, polymerization initiation, growth, termination and residual monomers removal, extruding the obtained polymer via a neck ring mold, cooling, drying, and granulating to obtain the finished ferrite bonded magnet granules.

Description

Technical field: [0001] The invention relates to a ferrite bonded magnet material and its preparation process. Background technique: [0002] Around the 1970s, a new type of magnetic material emerged: bonded magnets. The so-called bonded magnet refers to a magnet made of plastic or rubber as a binder and magnetic powder combined in a desired shape. The obtained magnetic material has a light relative density and is easy to process and form into a product with high dimensional accuracy and complex shape. It overcomes the defects that the original magnetic materials are hard and brittle, have poor processability, and cannot be made into complex and fine-shaped products. Permanent magnets usually bonded by rubber are generally not used to replace traditional permanent magnets due to their excess toughness and insufficient strength. The permanent magnet prepared with plastic bonded magnetic powder can obtain bonded magnets with high strength, high modulus, and high magnetic pro...

Claims

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Application Information

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IPC IPC(8): H01F1/113C04B35/26C04B35/632
Inventor 王大鹏姜彩云王强李培军赵树高
Owner QINGDAO UNIV OF SCI & TECH
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