Process for preparing permanent magnet iron oxygen body polymer composite magnet

A technology of permanent ferrite and composite magnets, applied in the direction of magnetism of organic materials/organic magnetic materials, can solve the problems of complex process, low mixing efficiency, high mixing equipment and process requirements, simplify the preparation process, overcome the mixing The effect of high equipment and process requirements

Inactive Publication Date: 2007-05-09
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 requires high mixing equipment and process, low mixing efficiency, and the uniformity of magnetic powder and polymer mixing is limited; (2) the existing technology uses the preparation process of magnetic powder polymer mixing → mixing → granulation → molding, The process is complex; (3) The coupling agent between the inorganic oxide magnetic powder and the organic binder is mainly combined 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

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 uniformly, then fully dried, and the surface of the magnetic powder is coated. Subsequently, in parts by mass, 6 parts of dibenzoyl peroxide are added to 100 parts of methyl methacrylate monomer to make methyl methacrylate monomer solution; 10 parts of monomer solution are 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 was 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, mix 6 parts of KH550 and 100 parts of strontium ferrite magnetic powder evenly, then fully dry, and carry out surface coating treatment on the magnetic powder; 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 Mix oxygen and magnetic powder to prepare a suspension system; heat the suspension system to 70°C in nitrogen and keep it warm for 7 hours, so that methyl methacrylate glycidyl ester monomer can undergo 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—polymethylmethacrylate. Glycidyl methyl acry...

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; 10 parts of the solution were mixed with 90 parts of strontium iron oxide The suspension system was prepared by mixing the magnetic powder with the magnetic powder; 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 polybutylacrylate-coated magnetic powder formed by polymerization is directly extruded under the action of a 1000kA / m orientation magnetic field to prepare the strontium ferrite powder-polybutylacrylate composite magnet. After testing...

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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 bo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L33/00C08L25/04C08F292/00C08K9/06B29C47/38H01F1/42B29C48/395
CPCB29C47/0004B29C48/022
Inventor 车晓舟
Owner SOUTH CHINA UNIV OF TECH
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