A kind of double-layer wave-absorbing material and preparation method thereof

A wave absorbing material, double-layer technology, applied in the field of wave absorbing materials, can solve the problems of less variable parameters, large material ratio, and limited wide application, etc., to achieve good wave absorption effect, enhance wave absorption performance, and broaden wave absorption. Band effect

Active Publication Date: 2021-03-12
LUOYANG INST OF CUTTING EDGE TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, single-layer wave-absorbing materials are usually used as wave-absorbing materials. Materials with good absorption performance often have large specificities and few variable parameters. They can only have good absorption effects in specific frequency bands, which limits their wide application in specific environments.

Method used

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  • A kind of double-layer wave-absorbing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The carbonyl iron powder magnetic powder wave absorbing agent is ball-milled in a ball mill for 20 hours, impregnated with ethyl acetate, filtered, and dried to obtain the carbonyl iron powder after ball milling. The carbon powder is ball-milled in a ball mill for 8 hours, then impregnated with dilute hydrochloric acid with a mass fraction of less than 10%, filtered and dried to obtain the ball-milled carbon powder.

[0027] Mix 10 parts of carbonyl iron powder after ball milling with 70 parts of epoxy resin, 8 parts of absolute ethanol diluent, 9 parts of polyamide curing agent and 3 parts of organic bentonite anti-sedimentation agent, and then disperse and mix evenly with an ultrasonic instrument, Injected into a mold with a specification of 300*300*3mm, cured at room temperature and formed as the bottom layer, that is, the impedance layer, wherein the mass content of carbonyl iron powder in the impedance is 10%, and the thickness of the impedance layer is 1mm; after t...

Embodiment 2

[0029] The carbonyl iron powder magnetic powder wave absorbing agent is ball-milled in a ball mill for 20 hours, impregnated with ethyl acetate, filtered, and dried to obtain the carbonyl iron powder after ball milling. The carbon powder is ball-milled in a ball mill for 8 hours, then impregnated with dilute hydrochloric acid with a mass fraction of less than 10%, filtered and dried to obtain the ball-milled carbon powder.

[0030] Mix 20 parts of carbonyl iron powder after ball milling with 65 parts of epoxy resin, 5 parts of n-butanol diluent, 6 parts of dicyandiamide curing agent and 4 parts of polyamide wax anti-sedimentation agent, and use ultrasonic instrument to disperse and mix evenly Finally, it is injected into a mold with a specification of 300*300*3mm, cured at room temperature, and formed as the bottom layer, that is, the resistance layer, wherein the mass content of carbonyl iron powder in the resistance layer is 20%, and the thickness of the resistance layer is 1...

Embodiment 3

[0032] The carbonyl iron powder magnetic powder wave absorbing agent is ball-milled in a ball mill for 20 hours, impregnated with ethyl acetate, filtered, and dried to obtain the carbonyl iron powder after ball milling. The carbon powder is ball-milled in a ball mill for 8 hours, then impregnated with dilute hydrochloric acid with a mass fraction of less than 10%, filtered and dried to obtain the ball-milled carbon powder.

[0033] Combine 30 parts of carbonyl iron powder after ball milling with 60 parts of epoxy resin, 3 parts of acetone diluent, 5 parts of dicyandiamide and diaminodiphenyl sulfone (mass ratio is 1:1) curing agent and 2 parts of organic bentonite anti-sedimentation Mix the agent, use an ultrasonic instrument to disperse and mix evenly at a high speed, inject it into a mold with a specification of 300*300*3mm, and cure it at room temperature to form the bottom layer, that is, the impedance layer, wherein the mass content of carbonyl iron powder in the impedance...

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Abstract

The invention provides a double-layer wave-absorbing material and a preparation method thereof. The method comprises: first ball milling carbonyl iron powder, impregnating it with an organic solvent, and filtering to obtain carbonyl iron powder after the first ball milling; in addition, carbonyl iron powder The carbonyl iron powder after the first ball milling is mixed with epoxy resin, the first diluent, the first curing agent and the first anti-sedimentation agent Mixing, curing and molding, as the impedance layer of the double-layer absorbing material; and mixing the second ball-milled carbon powder with epoxy resin, the second thinner, the second curing agent and the second anti-settling agent, above the impedance layer Curing and molding, as the matching layer of the double-layer wave-absorbing material, the double-layer wave-absorbing material is obtained. The double-layer absorbing material has the advantages of wide absorbing frequency band and strong absorbing performance, and at the same time has low density and light weight, and can be applied in many fields such as aerospace, ships, radar antennas, and electronic shielding.

Description

technical field [0001] The invention relates to the field of wave-absorbing materials, in particular to a double-layer wave-absorbing material and a preparation method thereof. Background technique [0002] With the development of modern science and technology, the impact of electromagnetic radiation on the environment is increasing. At the airport, flights are delayed due to electromagnetic wave interference; in hospitals, mobile phones often interfere with the normal work of various electronic medical instruments. Electromagnetism causes direct or indirect damage to the human body through thermal effects, non-thermal effects, and cumulative effects. Therefore, it is necessary to control electromagnetic pollution and electromagnetic radiation. [0003] At present, single-layer wave-absorbing materials are usually used as wave-absorbing materials. Materials with good absorption performance often have large specificities and few variable parameters. They can only have good ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K9/00C08K3/18C08L63/00
Inventor 不公告发明人
Owner LUOYANG INST OF CUTTING EDGE TECH
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