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Noise suppression piece and preparation method thereof

A technology of noise suppression sheets and thin sheets, which is applied in metal processing equipment, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of poor absorbing performance, uncontrollable, poor shielding effect, etc., to broaden the absorption frequency band, Meet the requirements of magnetic permeability and shielding, and improve the effect of electromagnetic wave absorption

Active Publication Date: 2016-05-04
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the function of most noise suppression tablets is relatively single, the anti-electromagnetic noise effect is limited, and at the same time, it cannot be adjusted, resulting in limited application
For example: graphite powder has high electrical conductivity, but its magnetic permeability is almost zero. It is a good high-frequency shielding material, but its low-frequency absorption effect is poor; carbonyl iron powder has better electromagnetic wave absorption performance, but its magnetic permeability is lower. Low, so its shielding effect is not good; flat iron-nickel-molybdenum magnetic powder has high magnetic permeability, excellent shielding performance, but limited loss of electromagnetic waves, poor absorbing performance; relatively speaking, flat iron-silicon-aluminum alloy powder Both absorbing and shielding performance are good, but the adjustable space is limited
Because of this, the traditional noise suppression sheet has been difficult to meet the increasing demands of electronic products, and there is an urgent need to develop a noise suppression sheet with multiple functions and adjustable electromagnetic properties

Method used

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  • Noise suppression piece and preparation method thereof
  • Noise suppression piece and preparation method thereof
  • Noise suppression piece and preparation method thereof

Examples

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Effect test

Embodiment 1

[0033] A noise suppression sheet, comprising by mass percentage content:

[0034] Flat soft magnetic alloy powder 35wt.%;

[0035] Binder 20wt.%;

[0036] Solvent 44wt.%.

[0037] The flat soft magnetic alloy powder in this embodiment is sendust powder; the binder is water-based polyurethane; the solvent is absolute ethanol.

[0038] The preparation method of the above-mentioned noise suppression sheet comprises the following steps:

[0039] 1) Preparation of flat soft magnetic alloy powder: Take soft magnetic alloy powder, 35wt.% by mass percentage, put it into flattening processing equipment, the speed is 340rpm, and the time is 6 hours; then perform annealing treatment, the specific process is in Under nitrogen protection atmosphere, annealing treatment at 800°C for 1 hour;

[0040] 2) Take the flat soft magnetic alloy powder prepared in step 1), and then add 20wt.% of binder, 45wt.% of solvent, and 1wt.% of organic silicon defoamer in terms of mass percentage content, ...

Embodiment 2

[0047] A noise suppression sheet, comprising by mass percentage content:

[0048] Flat soft magnetic alloy powder 60wt.%;

[0049] Binder 5wt.%;

[0050] Solvent 33wt.%.

[0051] The flat soft magnetic alloy powder in this embodiment is iron-nickel-molybdenum powder; the binder is epoxy resin; the solvent is acetone.

[0052] In order to be more stable, this embodiment also includes coupling agent and dispersant, 1wt.% silane coupling agent, dispersant, 1wt.% oleic acid.

[0053] The preparation method of the above-mentioned noise suppression sheet comprises the following steps:

[0054] 1) Preparation of flat soft magnetic alloy powder: Take soft magnetic alloy powder, 60wt.% by mass percentage, put it into flattening processing equipment, the speed is 380rpm, and the time is 3 hours; then perform annealing treatment, the specific process is in Under nitrogen protection atmosphere, annealing treatment at 800°C for 3 hours;

[0055] 2) Take the flat soft magnetic alloy po...

Embodiment 3

[0062] A noise suppression sheet, comprising by mass percentage content:

[0063] Flat soft magnetic alloy powder 50wt.%;

[0064] Binder 7wt.%;

[0065] Solvent 42wt.%.

[0066] The flat soft magnetic alloy powder in this embodiment is graphite powder; the binder is water-based polyurethane and epoxy resin, and they are mixed at a volume ratio of 1:1.

[0067] The solvent in this example is acetone.

[0068] For stable performance, this embodiment also includes a dispersant, 1wt.% oleic acid.

[0069] The preparation method of the above-mentioned noise suppression sheet comprises the following steps:

[0070] 1) Preparation of flat soft magnetic alloy powder: take soft magnetic alloy powder, 50wt.% by mass percentage, put it into flattening processing equipment, the speed is 350rpm, and the time is 4.5 hours; then annealing treatment is carried out, the specific process is in Under nitrogen protection atmosphere, annealing treatment at 800°C for 2 hours;

[0071] 2) Tak...

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Abstract

The invention discloses a noise suppression piece which comprises the following components in percentage by weight: 35-60 weight percent of flat soft magnetic alloy powder, 5-20 weight percent of a binder and 30-50 weight percent of a solvent. The invention further discloses a preparation method of the noise suppression piece. The noise suppression piece prepared by the method has the characteristics that the electromagnetic performance can be controlled, the noise suppression piece has multiple functions, the magnetic conductivity and the shielding demand can be met, the electromagnetic wave absorption effect can be improved, and the absorption band is broadened.

Description

technical field [0001] The invention belongs to the field of composite wave-absorbing material manufacturing, and in particular relates to a noise suppression sheet and a preparation method thereof. Background technique [0002] With the development of electronic information technology, various electronic equipment, mobile communication, and automation products can be seen everywhere in life. Market applications require electronic equipment to develop in the direction of high efficiency, integration, miniature, and intelligence, and the accompanying problems of electromagnetic interference and electromagnetic radiation Seriously affect the normal work of electronic devices and human health. At present, electromagnetic compatibility (EMC) standards have been implemented worldwide, and how to solve the problem of electromagnetic compatibility of electronic products has become a topic that major electronic manufacturers must face. [0003] Noise suppression sheet can effective...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/22H01F1/147H01F41/02
CPCH01F1/14791H01F41/0266B22F3/22B22F1/142B22F1/10
Inventor 叶怡婷刘立东郝斌杜军杰
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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