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Casting magnetic sheet magnetic powder orientation device and preparation method of wave-absorbing magnetic sheet

A magnetic sheet and magnetic powder technology, which is applied in the preparation of wave-absorbing magnetic sheets, and in the field of cast magnetic sheet magnetic powder orientation devices, can solve the problems of limited magnetic powder effect, large device, and low magnetic field intensity in the orientation magnetic field area, achieving high magnetic field strength, Small magnetic flux leakage and improved uniform orientation

Pending Publication Date: 2022-01-21
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] An existing wave-absorbing magnetic sheet magnetic powder orientation device includes a long-axis mechanism composed of a sleeve and a permanent magnet. In order to improve the uniformity of the magnetic field intensity in the orientation magnetic field area and the consistency of the magnetic field direction, the length of the long-axis mechanism is required to be greater than that of the cast The length of the film leads to a larger device, and at the same time, the magnetic field strength in the orientation magnetic field area is low, which has limited effect on magnetic powders that are difficult to orientate.

Method used

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  • Casting magnetic sheet magnetic powder orientation device and preparation method of wave-absorbing magnetic sheet
  • Casting magnetic sheet magnetic powder orientation device and preparation method of wave-absorbing magnetic sheet
  • Casting magnetic sheet magnetic powder orientation device and preparation method of wave-absorbing magnetic sheet

Examples

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Effect test

preparation example Construction

[0047] The preparation method of the wave-absorbing magnetic sheet based on the cast magnetic sheet magnetic powder orientation device comprises the following steps:

[0048] Step S1 , preparing a mixed slurry, coating the mixed slurry on a base film made of non-magnetic material and putting it into a casting machine. The base film can be made of, but not limited to, polymer materials and metal materials, such as PET, stainless steel, etc., preferably a PET film.

[0049] Wherein, when preparing the mixed slurry, polyurethane, flaky sendust magnetic powder and absolute ethanol may be mixed together to form the mixed slurry. Of course, the binder in the mixed slurry is not limited to polyurethane, and can also be liquid rubber, phenolic resin, etc., and the solvent is not limited to absolute ethanol, but can also be ethyl acetate, etc.

[0050] Step S2, the scraper moves along the set direction, so that the mixed slurry forms a casting film 4 on the base film.

[0051] Step S...

Embodiment 1

[0056] The distance between the axes of the two permanent magnet modules 3 is 70mm, and each permanent magnet module 3 is composed of six cylindrical magnets with a diameter of 30mm and a length of 100mm; The gap between two adjacent magnets is less than 0.03mm.

[0057] The sleeve 2 is made of stainless steel, the wall thickness of the sleeve 2 is 3.5mm, and the length is 660mm. The permanent magnet module 3 and the sleeve 2 are bonded with epoxy resin; the bracket 1 and the base 5 are made of stainless steel, the sleeve 2 and the bracket 1 are connected by bolts made of non-magnetic materials, and the bracket 1 and base 5 are welded together.

[0058] Gauss meter was used to measure the magnetic field intensity in the orientation magnetic field area, and the magnetic field intensity at 10 different positions were recorded respectively, and the magnetic field intensity in the orientation magnetic field area was 1365Gs-1391Gs.

[0059] The mixed slurry composed of polyuretha...

Embodiment 2

[0063] Used device is basically the same as embodiment one, and difference is: the distance between the axes of two permanent magnet modules 3 is 74mm, and each permanent magnet module 3 is made of six diameters and is 30mm, and length is the cylindrical magnet of 80mm Composition; The material of the cylindrical magnet is sintered NdFeB magnet, the grade is N48.

[0064] The sleeve 2 is made of polytetrafluoroethylene, the wall thickness of the sleeve 2 is 4mm, and the length is 520mm. The pipe sleeve 2 and the bracket 1 are bonded with epoxy resin.

[0065] Gauss meter was used to measure the magnetic field intensity in the orientation magnetic field area, and the magnetic field intensity in 10 different positions were recorded respectively, and the magnetic field intensity in the orientation magnetic field area was 1526Gs-1551Gs. The processing steps are the same as in Example 1, and the obtained wave-absorbing magnetic sheet is tested by an impedance analyzer, and its mag...

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Abstract

The invention discloses a casting magnetic sheet magnetic powder orientation device and a preparation method of a wave-absorbing magnetic sheet, belongs to the technical field of magnetic materials, and is designed for solving the problems of low magnetic field intensity and the like of an existing orientation device. The casting magnetic sheet magnetic powder orientation device comprises a support made of a non-magnetic conductive material; two pipe sleeves both fixedly arranged on the support and parallel to each other, wherein a gap allowing a casting film to pass through is formed between the two pipe sleeves; and the two permanent magnet modules respectively arranged in the two pipe sleeves in a penetrating manner, wherein a magnetic field is at least formed between the two permanent magnet modules. According to the casting magnetic sheet magnetic powder orientation device and the preparation method of the wave-absorbing magnetic sheet, uniform orientation of the magnetic powder of the casting magnetic sheet in the casting process is improved, the magnetic performance of the flexible magnetic sheet is further improved, meanwhile, the requirement of the casting process for the passing position of a base film is lowered, the magnetic field intensity is large, and the consistency of casting magnetic sheet products is improved.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a cast magnetic sheet magnetic powder orientation device and a method for preparing a wave-absorbing magnetic sheet based on the cast magnetic sheet magnetic powder orientation device. Background technique [0002] High-performance flexible soft magnetic magnetic sheet is prepared by casting process of scaly magnetic powder and polymer binder, and is widely used in consumer electronic products such as smartphones, notebook computers, GPS navigators, etc. Absorb electromagnetic noise and solve electromagnetic compatibility problems of electronic products. Generally, the higher the magnetic permeability of the flexible soft magnetic sheet, the better the electromagnetic noise suppression effect. One of the main factors determining the magnetic permeability of the flexible soft magnetic sheet is: the degree of orientation arrangement of the sheet magnetic powder in the b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/16H01F1/20H01F1/22H01F1/42H01F41/02
CPCH01F1/16H01F1/20H01F1/22H01F1/42H01F41/02
Inventor 刘立东单震朱航飞何景航邵皝智
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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