High-efficiency light electromagnetic absorbing material with closed-pore structure and preparation method of high-efficiency light electromagnetic absorbing material

A closed-cell structure and absorbing material technology, which is applied in the direction of electrical components, magnetic field/electric field shielding, etc., can solve the problems of material thermal conductivity limitation, absorption efficiency priority, large size of absorbing material, etc., to improve electromagnetic absorption performance and make up holes The effect of internal air pressure change and increased dielectric loss

Pending Publication Date: 2022-03-04
江苏宝利金材科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the main problems of the above-mentioned absorbing materials include: ① due to the existence of micropores, the product has disadvantages such as low strength and poor dimensional stability; ② due to the air medium or vacuum state in the micropores, the relative dielectric strength of the product Both the constant and the magnetic permeability are small, so the size of the absorbing material is large, and the absorption efficiency is prioritized; ③ Due to the existence of micropores, the thermal conductivity of the material is limited, so it is difficult to apply to high-power electromagnetic absorption occasions

Method used

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  • High-efficiency light electromagnetic absorbing material with closed-pore structure and preparation method of high-efficiency light electromagnetic absorbing material
  • High-efficiency light electromagnetic absorbing material with closed-pore structure and preparation method of high-efficiency light electromagnetic absorbing material
  • High-efficiency light electromagnetic absorbing material with closed-pore structure and preparation method of high-efficiency light electromagnetic absorbing material

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preparation example Construction

[0056] A method for preparing a high-efficiency light-weight electromagnetic absorbing material with a closed-cell structure, comprising the following steps:

[0057] (1) Mix thermosetting resin, absorbent, diluent, and thermally conductive filler evenly, heat to 30-60°C and stir for 5-40 minutes; cool to room temperature, continue to add curing accelerator, chemical foaming agent and foam stabilizer, and Choose whether to add curing agent according to the needs, and get the slurry after stirring for 5-30 minutes;

[0058] (2) adding the stirred slurry into a sealed container, and then introducing supercritical carbon dioxide gas into it to form a porous slurry;

[0059] (3) Heat the closed mold to 80-100°C, inject the porous slurry into the mold, withdraw the mold to make the slurry fully foam and fully fill the mold cavity, and the degree of mold withdrawal is to expand the mold cavity by 1.3 -1.8 times;

[0060] (4) Demoulding after heat preservation for a set time to prepa...

Embodiment 1

[0063] (1) Mix 58 parts of carbonyl iron powder absorbent and 25 parts of graphite powder by ball milling, then add 15 parts of epoxy resin and 3 parts of ethylene glycol bisglycidyl ether, heat to 50°C and stir for 25 minutes to obtain no agglomeration Shaped resin slurry; cool to room temperature and continue to add 6 parts of diaminodiphenylmethane, 3 parts of diethanolamine, 5 parts of calcium carbonate and 0.8 part of polyoxyethylene sorbitan laurate, after stirring for 15min, the viscosity is obtained at 19000- Slurry within the range of 21000mps (rotational viscometer);

[0064] (2) Add the stirred slurry into a sealed pressure vessel, then feed supercritical carbon dioxide gas into it to form a porous slurry;

[0065] (3) Heating the closed mold to 100°C, injecting the porous slurry into the mold, withdrawing the mold to make the slurry fully foam and fully fill the mold cavity, wherein the degree of mold withdrawal is such that the mold cavity is enlarged by 1.5 times...

Embodiment 2

[0070] (1) Mix 110 parts of carbonyl iron powder absorbent and 20 parts of graphite powder by ball milling, then add to 24 parts of epoxy resin and 5 parts of ethylene glycol bisglycidyl ether, heat to 60°C and stir for 25 minutes to obtain no agglomeration Shaped resin slurry; cool to room temperature and continue to add 9 parts of diaminodiphenylmethane, 3 parts of diethanolamine, 8 parts of calcium carbonate and 1.5 parts of polyoxyethylene sorbitan laurate, after stirring for 20min, the viscosity is obtained at 20000- Slurry within the range of 23000mps (rotational viscometer);

[0071] (2) Add the stirred slurry into a sealed pressure vessel, then feed supercritical carbon dioxide gas into it to form a porous slurry;

[0072] (3) Heating the closed mold to 100°C, injecting the porous slurry into the mold, withdrawing the mold to make the slurry fully foam and fully fill the mold cavity, wherein the degree of mold withdrawal is such that the mold cavity is enlarged by 1.6 ...

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Abstract

The invention discloses a high-efficiency lightweight electromagnetic absorption material with a closed-pore structure and a preparation method thereof. The high-efficiency lightweight electromagnetic absorption material comprises the following raw materials: 10-50 parts of thermosetting resin; 0.1 to 10 parts of a curing accelerator; 40 to 200 parts of an absorbent; 2-30 parts of a heat-conducting filler; 0-10 parts of a diluent; 0.5-10 parts of a chemical foaming agent; 0.5-3 parts of a foam stabilizer; the parts are all mass parts. The foam material with the closed-cell structure can effectively improve the strength of the porous material, so that the dimensional stability of the material is improved, and the foam material has the characteristics of light weight, high efficiency, high heat conductivity and high dielectric constant, is simple to operate and high in cost and yield, and can easily realize different shapes. When liquid or gas is injected into the micropores, the dielectric constant and the thermal conductivity of the material can be effectively improved, and the wave-absorbing performance and the thermal conductivity of the wave-absorbing material are greatly improved.

Description

technical field [0001] The invention relates to a high-efficiency light-weight electromagnetic absorption material with a closed-pore structure and a preparation method thereof. Background technique [0002] With the rapid development of the electronics industry, the integration of electronic devices is getting higher and higher, the electromagnetic wave emission power of electronic devices is getting higher and higher, and the size of electronic devices is getting smaller and smaller. Among them, the electromagnetic waves emitted by electronic devices not only affect their own The normal operation of equipment and other equipment may also have adverse effects on the human body and the natural environment. In order to actively and effectively suppress and prevent the hazards caused by electromagnetic radiation and leakage, the current common method is to absorb and reflect electromagnetic waves. [0003] In the prior art, polymer resin-based microwave-absorbing materials ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/00C08L61/06C08K3/18C08K3/04C08K3/34C08J9/12C08J9/08H05K9/00
CPCC08J9/122C08J9/08C08J9/0066H05K9/0081C08J2203/06C08J2203/08C08J2203/02C08J2363/00C08J2203/184C08J2361/06C08J2205/052
Inventor 刘芬王勇王一超
Owner 江苏宝利金材科技有限公司
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