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Electromagnetic wave interference suppression paint and a method thereof for preparing an 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 reduced magnetic permeability, inability to increase the magnetic permeability of electromagnetic wave interference suppression coatings, and reduced magnetic properties , to achieve the effects of soft shape retention, strong electromagnetic wave absorption, and excellent mechanical strength

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

[0023] 98 parts by weight of polymer resin polyurethane (manufactured 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 is soft Magnetic powder (specific surface area 0.23m 2 / g, anisotropic magnetic field 135Oe, resonance frequency fr″: 2000MHz) is dispersed in glue, then adds 200 parts by weight of cyclohexanone and 10 parts by weight of organic curing agent 1,3-bis(tert-butylperoxyisopropyl) Benzene, making a uniform coating.

[0024] 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 ovens at 90°C, 110°C, and 130°C, and then passed throug...

Embodiment 2

[0032] 88 parts by weight of polymer resin polyurethane (manufactured by Sigma-Aldrich, with an average molecular weight of 400,000) are dissolved into glue with 100 parts by weight of toluene and 170 parts by weight of cyclohexanone in an organic solvent, and 500 parts by weight of Fe-Si-Al alloy is 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 to form a uniform coating.

[0033] 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-...

Embodiment 3

[0041] 80 parts by weight of polymer resin polyurethane (prepared by Sigma-Aldrich, average molecular weight 400,000) is configured into glue with 200 parts by weight of cyclohexanone dissolved in organic solvent, and 500 parts by weight of Fe-Si-A1 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 to form a uniform coating.

[0042] 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 ovens at 90°C, 110°C, and 130°C, and the...

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Abstract

The invention discloses electromagnetic wave interference suppression paint which comprises soft magnetic powder, polymer resin, an organic curing agent and an organic solvent. The invention also provides a preparation method of an electromagnetic wave interference suppression coating. The method comprises the following steps: spreading the paint on a continuously rotating polymer film support body to form a coating, carrying out rotating magnetic field orientation treatment on the coating, peeling off the molded coating from the polymer film support, and curing at least one molded coating. The coating prepared by the invention not only has strong electromagnetic wave absorptivity, 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 an electromagnetic wave interference suppression coating and a preparation method of 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 con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D5/32
CPCC08K2003/023C08K2003/0812C08K2003/0856C09D5/32C09D175/04C08K13/02C08K3/08C08K3/02
Inventor 田城华胡庆江许嘉颂
Owner ZHEJIANG YUANBANG MATERIAL TECH