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Electromagnetic wave interference suppression coating

An interference suppression, electromagnetic wave technology, applied in coatings, radiation-absorbing coatings, polyurea/polyurethane coatings, etc., can solve the problems of inability to increase the magnetic permeability of electromagnetic interference suppression coatings, decrease in permeability, decrease in magnetic properties, etc. , to achieve the effect of solving electromagnetic wave interference, high magnetic permeability, soft shape retention

Inactive Publication Date: 2019-11-22
ZHEJIANG YUANBANG MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the kneading and calendering method, the soft magnetic powder is strained during kneading, and it is difficult to fill the EMI suppressing coating with the soft magnetic powder at a high density. Therefore, the magnetic properties of the soft magnetic powder itself are reduced, making it impossible to increase the EMI suppressing coating. layer permeability problem
In addition, under high temperature or high temperature and high humidity environment, the thickness of the sheet changes in the direction of thickening, and there is a problem that the magnetic permeability decreases.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 98 parts by weight of thermoplastic polyurethane (prepared by Sigma-Aldrich, with an average molecular weight of 400,000) are dissolved into glue with 170 parts by weight of organic solvent toluene and 130 parts by weight of cyclohexanone, and 500 parts by weight of Fe-Si-Al alloy soft magnetic powder (specific surface area 0.23m 2 / g, anisotropic magnetic field 135Oe, resonance frequency fr″: 2000MHz) is dispersed in the glue, then adds 200 parts by weight of cyclohexanone and 10 parts by weight of organic curing agent 1,3-bis(tert-butylperoxyisopropyl) Benzene, 10 parts by weight of surfactant bis(2-ethylhexyl) phthalate, make uniform coating.

[0017] Adjust the temperature of the paint to 25°C, spread it on a continuously rotating PET polymer film support at a coating speed of 2m / min to form a coating, and at the same time perform a rotating magnetic field orientation treatment on the coating, and then 85-155°C drying treatment, the coating is dried in three-stage ...

Embodiment 2

[0025] 88 parts by weight of thermoplastic polyurethane (manufactured by Sigma-Aldrich, with an average molecular weight of 400,000) are dissolved into glue with 100 parts by weight of organic solvent toluene and 170 parts by weight of cyclohexanone, and 500 parts by weight of Fe-Si-Al alloy soft magnetic powder (specific surface area 0.27m 2 / g, anisotropic magnetic field 115Oe, resonance frequency fr″: 2000MHz) is dispersed in the glue, then adds 500 parts by weight of cyclohexanone, 4 parts by weight of organic curing agent 1,3-bis(tert-butylperoxyisopropyl) Benzene and 4 parts by weight of N, N'-m-phenylene bismaleimide, and 10 parts by weight of surfactant bis(2-ethylhexyl) phthalate to prepare a uniform coating.

[0026] Adjust the temperature of the paint to 25°C, spread it on a continuously rotating PET polymer film support at a coating speed of 2m / min to form a coating, and at the same time perform a rotating magnetic field orientation treatment on the coating, and th...

Embodiment 3

[0034] 80 parts by weight of thermoplastic polyurethane (manufactured by Sigma-Aldrich, with an average molecular weight of 400,000) is dissolved into glue with 200 parts by weight of organic solvent cyclohexanone, and 500 parts by weight of Fe-Si-Al alloy soft magnetic powder (specific surface area 0.23m 2 / g, anisotropic magnetic field 115Oe, resonance frequency fr″: 2000MHz) is dispersed in the glue, then adds 570 parts by weight of cyclohexanone, 4 parts by weight of organic curing agent 1,3-bis(tert-butylperoxyisopropyl) Benzene and 4 parts by weight of N, N'-m-phenylene bismaleimide, and 10 parts by weight of surfactant bis(2-ethylhexyl) phthalate to prepare a uniform coating.

[0035] Adjust the temperature of the paint to 25°C, spread it on a continuously rotating PET polymer film support at a coating speed of 2m / min to form a coating, and at the same time perform a rotating magnetic field orientation treatment on the coating, and then 85-155°C drying treatment, the co...

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Abstract

The invention discloses an electromagnetic wave interference suppression coating, which comprises soft magnetic powder, thermoplastic polyurethane and an organic curing agent. The coating includes, byweight, 75-88% of the soft magnetic powder, 10-23% of the thermoplastic polyurethane and 0.5-3% of the organic curing agent. The electromagnetic wave interference suppression coating provided by theinvention not only has strong electromagnetic wave absorbability, but also has excellent mechanical strength and processability.

Description

technical field [0001] The invention relates to the technical field of electronic component materials, in particular to a high-permeability electromagnetic wave interference suppression coating that can effectively suppress electromagnetic interference problems in high-frequency electronic circuits / devices. Background technique [0002] With the popularization of electronic devices such as mobile phones, personal computers, and tablet computers, mutual interference, interference, misoperation, or information theft of electromagnetic waves has become a technical problem and a social problem. At present, as a countermeasure against such electromagnetic wave interference, soft magnetic materials with high magnetic permeability are generally used as electromagnetic wave absorbers. After the soft magnetic material absorbs the electromagnetic wave, the energy of the electromagnetic wave can be converted into heat through the spin reversal or the movement of the magnetic wall, ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D5/32
CPCC09D5/32C09D175/04C08K3/08C08K5/12C08K5/14
Inventor 田城华胡庆江许嘉颂
Owner ZHEJIANG YUANBANG MATERIAL TECH