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Configuration method of electromagnetic wave interference suppression coating

A technology of interference suppression and configuration method, used in radiation-absorbing coatings, polyurea/polyurethane coatings, coatings, etc., can solve the problem of soft magnetic powder mass percentage fluctuation, difficult to precisely control, and produce stable magnetic permeability electromagnetic wave interference suppression coatings. Layer difficulty and other problems, to achieve the effect of ensuring the stability of magnetic permeability, soft shape retention, and strong electromagnetic wave absorption

Active Publication Date: 2022-05-06
ZHEJIANG YUANBANG MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, during the preparation process of the EMI suppression coating, the rapid volatilization of the organic solvent causes the solid content of the EMI suppression coating to fluctuate all the time, resulting in the fluctuation of the mass percentage of the soft magnetic powder in the non-solvent material in the slurry and it is difficult to control accurately. It is very difficult to produce EMI suppression coatings with stable magnetic permeability

Method used

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  • Configuration method of electromagnetic wave interference suppression coating

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Experimental program
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Effect test

Embodiment 1

[0031] Existing Fe-Si-Al alloy soft magnetic powder (specific surface area 0.23m 2 / g, anisotropic magnetic field 135Oe, resonance frequency fr″: 2000MHz), it is necessary to configure the Fe-Si-Al alloy soft magnetic powder into a slurry with a feeding amount A of 500 parts by weight, and meet the target requirements: Fe-Si-Al The mass percentage r of the soft magnetic powder in the non-solvent material (soft magnetic powder and thermoplastic polyurethane) in the slurry is 80.6%.

[0032] 180 parts by weight of thermoplastic polyurethane (manufactured by Sigma-Aldrich, with an average molecular weight of 400,000) was dissolved in an organic solvent of 340 parts by weight of toluene and 260 parts by weight of cyclohexanone to form a glue. The measured glue solid content was 30%. Calculate the mass M of the glue that needs to be added according to formula I to be 400 parts by weight. Take 400 parts by weight of glue and stir and disperse 500 parts by weight of Fe-Si-Al in the ...

Embodiment 2

[0042] Existing Fe-Si-Al alloy soft magnetic powder (specific surface area 0.27m 2 / g, anisotropic magnetic field 115Oe, resonance frequency fr″: 2000MHz), it is necessary to configure the Fe-Si-Al alloy soft magnetic powder into a slurry with a feed amount A of 500 parts by weight, and meet the target requirements: Fe-Si-Al The mass percentage r of the soft magnetic powder in the non-solvent material (soft magnetic powder and thermoplastic polyurethane) in the slurry is 80.6%.

[0043] 180 parts by weight of thermoplastic polyurethane (manufactured by Sigma-Aldrich, with an average molecular weight of 400,000) was dissolved in an organic solvent of 340 parts by weight of toluene and 260 parts by weight of cyclohexanone to prepare glue. The measured glue solid content was 25%. According to the formula I, the mass M of the glue to be added is 480 parts by weight. Take 480 parts by weight of glue and stir and disperse 500 parts by weight of Fe-Si-Al in the glue to form a slurry...

Embodiment 3

[0053] Existing Fe-Si-Al alloy soft magnetic powder (specific surface area 0.23m 2 / g, anisotropic magnetic field 135Oe, resonance frequency fr″: 2000MHz), it is necessary to configure the Fe-Si-Cr alloy soft magnetic powder into a slurry with a feeding amount A of 500 parts by weight, and meet the target requirements: Fe-Si-Al The mass percentage r of the soft magnetic powder in the non-solvent material (soft magnetic powder and thermoplastic polyurethane) in the slurry is 80.6%.

[0054] 200 parts by weight of thermoplastic polyurethane (manufactured by Sigma-Aldrich, with an average molecular weight of 400,000) was dissolved in an organic solvent of 340 parts by weight of toluene and 260 parts by weight of cyclohexanone to form a glue. The measured glue solid content was 32%. According to the formula I, the mass M of the glue to be added is 376 parts by weight. Take 376 parts by weight of glue and stir and disperse 500 parts by weight of Fe-Si-Al in the glue to form a slur...

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Abstract

The invention discloses a method for configuring electromagnetic wave interference suppression coatings. The glue prepared by dissolving thermoplastic polyurethane with an organic solvent is used to disperse soft magnetic powder to form a slurry. The dynamic actual value of the solid content of the glue is monitored to calculate the The quality of the glue to be added; then add an organic solvent and an organic curing agent to the slurry, the coating includes 29% to 59% of soft magnetic powder, 5% to 9% of thermoplastic polyurethane, and 0.5% to organic curing agent 1.6% and organic solvents 35% to 62%. The electromagnetic wave interference suppression coating prepared by using the coating prepared by the invention not only has strong electromagnetic wave absorption, 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 method for configuring 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 o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D7/80C09D175/04C09D5/32
CPCC09D7/80C09D175/04C09D5/32C08K2003/023C08K2003/0812C08K2003/0856C08K3/08C08K3/02
Inventor 许嘉颂胡庆江田城华
Owner ZHEJIANG YUANBANG MATERIAL TECH