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Electromagnetic wave absorbing material and preparation method thereof

A technology for absorbing materials and electromagnetic waves, applied in electrical components, magnetic field/electric field shielding, etc., can solve the problems of being unable to be wrapped, not widely used, and easy to break

Active Publication Date: 2021-05-07
STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polymer resin material is affected by its physical and chemical properties. When the absorber increases to a certain ratio, there will be a situation that "the polymer resin cannot wrap the absorber powder", and the electromagnetic wave absorbing material prepared in this way is intuitive. It is manifested as powder falling off the surface, the material is brittle and easy to break, etc., such materials that absorb electromagnetic waves cannot be mass-produced, let alone widely used

Method used

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  • Electromagnetic wave absorbing material and preparation method thereof
  • Electromagnetic wave absorbing material and preparation method thereof
  • Electromagnetic wave absorbing material and preparation method thereof

Examples

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preparation example Construction

[0044] A method for preparing an electromagnetic wave absorbing material, comprising the following steps:

[0045] S1. Dissolving the special polyurethane resin and the plasticizer in a solvent and stirring evenly to obtain the first mixture;

[0046] S2. Add electromagnetic wave absorber powder to the first mixture, stir evenly, and continue to add active curing agent and free radical initiator to obtain the second mixture;

[0047] S3. Process the second mixture into a film by means of coating, casting or extrusion, and then heat the film in an oven to remove the solvent. The heating temperature is lower than the boiling point of the solvent and the free radical initiator the initiation temperature;

[0048] S4. Put the film treated in step S3 into a flat plate vulcanizer under pressure and vulcanize it into a sheet, or place it in a drum type vulcanizer under pressure and continuously vulcanize it into a film. The vulcanization temperature is equal to the initiation temper...

Embodiment 1

[0051] An electromagnetic wave absorbing material, comprising the following raw materials in parts by weight: 18 parts of special polyurethane resin, 82 parts of electromagnetic wave absorbing agent, 120 parts of solvent, 0.2 part of active curing agent, 0.5 part of plasticizer, and 0.5 part of free radical initiator;

[0052] Wherein, the structural formula of special polyurethane resin X group is The structural formula of the Y group is -(CH 2 ) 2 -; the structural formula of the Z group p=3, q=4, m=3, n=4, the number average molecular weight of the special polyurethane resin is 58000.

[0053] The electromagnetic wave absorber is spherical sendust powder, and the diameter of the spherical sendust powder is 5 microns.

[0054] The solvent is cyclohexanone.

[0055] The active curing agent is glycerol triacrylate.

[0056] The plasticizer is dimethyl phthalate.

[0057] The radical initiator was 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane.

[0058] Prepare as follow...

Embodiment 2

[0064] An electromagnetic wave absorbing material, comprising the following raw materials in parts by weight: 15 parts of special polyurethane resin, 85 parts of electromagnetic wave absorbing agent, 100 parts of solvent, 0.3 part of active curing agent, 1 part of plasticizer, and 1 part of free radical initiator;

[0065] Wherein, the structural formula of special polyurethane resin X group is The structural formula of the Y group is -(CH 2 ) 4 -; the structural formula of the Z group p=4, q=2, m=7, n=3, and the number average molecular weight of the special polyurethane resin is 63000.

[0066] The electromagnetic wave absorber is flaky iron silicon chromium powder, and the maximum length of the flake iron silicon chromium powder in each direction is 25 microns.

[0067] The solvent is dimethylformamide.

[0068] The active curing agent is glycerol trimethacrylate.

[0069] The plasticizer is dibutyl phthalate.

[0070] The free radical initiator is dicumyl di-tert...

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Abstract

The invention discloses an electromagnetic wave absorbing material and a preparation method thereof, and relates to the field of composite materials, the electromagnetic wave absorbing material comprises a raw material electromagnetic wave absorbent and special polyurethane resin, the structure of the polyurethane resin is shown in the specification, X, Y and Z are all groups, m and n are both positive integers, the structural formula of the X group is one in the specification, and p and q are both positive integers; the structural formula of the Y group is one of -(CH2) 2-, -(CH2) 4- and-(CH2) 6-; and the structural formula of the Z group is one in the specification. The material has the beneficial effects that the filling effect of the resin on the electromagnetic wave absorbent is improved by adjusting the chemical structure of the special polyurethane resin, so that the absorption effect on electromagnetic waves is improved, and the prepared composite material can maintain relatively stable appearance and properties.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a composite material capable of absorbing electromagnetic waves and a preparation method of the material. Background technique [0002] With the advancement of science and technology, the application of electronic and information technology has developed rapidly, and various modern electronic devices such as radio broadcasting, television, and mobile phones have become popular rapidly, and people are using and relying on more and more information systems. Electromagnetic waves radiated and leaked by electronic equipment threaten human health and safety; information systems are transmitted by means of digital signals, which are easily interfered by electromagnetic waves and cause errors. It has been found that electromagnetic wave interference generated by radiated electromagnetic waves from electronic and information equipment can cause obvious medical and communicati...

Claims

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Application Information

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IPC IPC(8): C08L75/14C08K7/18C08K7/00C08K3/08C08K3/02C08K3/18H05K9/00C08J5/18
CPCC08K7/18C08K7/00C08K3/08C08K3/02C08K3/18H05K9/0081C08J5/18C08K2003/023C08K2003/0812C08K2003/0856C08J2375/14C08L75/14
Inventor 刘平张文华毛荣军伍发元李瑞代小敏
Owner STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST