Process for preparing permanent magnet iron oxygen body polymer composite magnet

A technology of permanent magnet ferrite and composite magnet, applied in the direction of magnetism of organic materials/organic magnetic materials, etc., can solve the problems of complex process, low mixing efficiency, and high mixing equipment and process requirements, to simplify the preparation process, overcome the mixed Equipment and process demanding effects

Inactive Publication Date: 2005-11-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The prior art has the following deficiencies: (1) The prior art adopts permanent ferrite magnetic powder and polymer to be directly mixed for molding processing. Due to the difference in specific gravity between the magnetic powder and the polymer, in order to make the two materials mix evenly, forced Mixing has high requirements on mixing equipment and technology, low mixing efficiency, and the uniformity of mixing magnetic powder and polymer is limited; (2) The existing technologies all use the manufacturing process of magnetic powder polymer mixing → kneading → granulation → molding , the process is complicated; (3) The coupling agent is mainly used to combine the inorganic oxide magnetic powder and the organic binder through chemical bonds, and the bonding strength is limited, which will also affect the uniformity of the mixing between the magnetic powder and the binder. influences

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In terms of parts by mass, 3 parts of KH550 and 100 parts of strontium ferrite magnetic powder are mixed evenly and then fully dried, and the surface of the magnetic powder is coated. Subsequently, in parts by mass, 6 parts of dibenzoyl peroxide were added to 100 parts of methyl methacrylate monomer to make methyl methacrylate monomer solution; 10 parts of monomer solution was mixed with the above Mix 90 parts of strontium ferrite magnetic powder after one-step treatment to prepare a suspension system, then heat the suspension system to 90°C in nitrogen and keep it warm for 8 hours to make the methyl methacrylate monomer undergo in-situ polymerization on the surface of the magnetic powder Polymethyl methacrylate is produced. Finally, using a twin-screw extruder at 190°C, the magnetic powder coated with polymethyl methacrylate is directly extruded under the action of a 1000kA / m orientation magnetic field to prepare the strontium ferrite powder-polymethyl methacrylate Es...

Embodiment 2

[0025] In terms of parts by mass, 6 parts of KH550 and 100 parts of strontium ferrite magnetic powder were mixed evenly and then fully dried, and the surface of the magnetic powder was coated; Add 7 parts of azobisisobutyronitrile in the glyceride monomer to make methyl methacrylate glycidyl ester monomer melt; and 10 parts of monomer solution with 90 parts of strontium iron Oxygen and magnetic powder are mixed to prepare a suspension system; the suspension system is heated to 70°C in nitrogen and kept for 7 hours, so that methyl methacrylate glycidyl ester monomer undergoes in-situ polymerization reaction on the surface of the magnetic powder to form polymethyl methacrylate Ester glycidyl ester. Finally, using a single-screw extruder at 130°C, the magnetic powder coated with polymethyl methacrylate glycidyl ester was directly extruded under the action of a 1000kA / m orientation magnetic field to prepare the strontium ferrite powder-polymethacrylate Glycidyl methyl acrylate co...

Embodiment 3

[0027] In terms of parts by mass, 5 parts of KH550 and 100 parts of strontium ferrite magnetic powder are mixed uniformly, then fully dried, and the surface of the magnetic powder is coated. Subsequently, in terms of parts by mass, 6 parts of azobisisobutyronitrile were added to 100 parts of butyl acrylate to make a butyl acrylate melt; Parts of strontium ferrite magnetic powder were mixed to prepare a suspension system; the suspension system was heated to 65°C in nitrogen, and kept for 5 hours, so that the butyl acrylate monomer was in-situ polymerized on the surface of the magnetic powder to form polybutyl acrylate. Finally, using a twin-screw extruder at 120 ° C, the polybutyl acrylate-coated magnetic powder formed by polymerization is directly extruded under the action of an orientation magnetic field of 1000 kA / m to prepare the strontium ferrite powder-polybutyl acrylate Ester composite magnets. After testing, the maximum magnetic energy product of the prepared composite...

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Abstract

A composite magnet of permanent-magnet ferrite-polymer is prepared through adding the permanent-magnet ferrite powder to the solution of polymer, in-situ polymerizing reaction to generate polymer on the surface of magnetic particles, and extruding out for shaping.

Description

technical field [0001] The invention relates to the technical field of magnet forming and processing, in particular to a preparation method of a permanent ferrite polymer composite magnet. Background technique [0002] Bonded magnets are made by mixing magnetic powder with resin or polymer materials or coating magnetic powder, and then preparing it into final size and shape by molding, injection molding, calendering and extrusion, and then curing. Because bonded magnets contain a certain amount of binders, which are non-magnetic materials, the density of bonded magnets is lower than that of sintered magnets, so their magnetic properties are lower than those of sintered magnets. Bonded magnets have been widely used in industry, agriculture, Military, science and technology, medicine, and all aspects of life, such as small precision motors, stepping motors, and spindle motors for hard disk drives that are widely used. Among them, the application of bonded magnets in rotating...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C48/395C08L33/00
CPCB29C47/0004B29C48/022
Inventor 车晓舟
Owner SOUTH CHINA UNIV OF TECH
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