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Flexible composite wave absorbing material applied to 5G mm wave band and preparation method of flexible composite wave absorbing material

A technology of composite wave-absorbing materials and composite materials, which is applied in the field of flexible composite wave-absorbing materials and their preparation, can solve problems such as absorption efficiency lower than 99%, reflection loss is not high, and electromagnetic wave performance is not good enough, so as to facilitate the expansion of production And industrial production, excellent absorption performance, highlight the effect of mechanical properties

Inactive Publication Date: 2018-11-13
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the invention can achieve effective absorption in the full frequency band of 26.5-40GHz, the inherent electrical loss and magnetic loss of the filler are relatively poor, resulting in a large amount of filler added, and the electromagnetic wave performance is not excellent enough (the maximum absorption loss is -18.5dB, the absorption The efficiency is lower than 99%), and the material has as many as eight layers, the process is too complicated, and it is not suitable for most of the current industrial production
[0006] At present, there are few studies on single-layer structure millimeter wave absorbing materials, the ratio of raw materials and preparation process are relatively complicated, and the reflection loss is not high

Method used

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  • Flexible composite wave absorbing material applied to 5G mm wave band and preparation method of flexible composite wave absorbing material
  • Flexible composite wave absorbing material applied to 5G mm wave band and preparation method of flexible composite wave absorbing material
  • Flexible composite wave absorbing material applied to 5G mm wave band and preparation method of flexible composite wave absorbing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Weigh (7.5g) graphite oxide and add DMF (amount ratio of 1g / 150ml), ultrasonically disperse for 2h; weigh (100g) nitrile rubber (model is Nandi 3365, Zhennandi Chemical Co., Ltd., the content of acrylonitrile is 33 %), shredded and heated at a constant temperature in an oil bath at 70°C to dissolve it in DMF (amount ratio of 1g / 20ml);

[0036] Slowly pour the rubber solution dissolved in DMF into the graphene oxide dispersion obtained after ultrasonic treatment (the raw material is graphite oxide, which becomes graphene oxide when the sheets are peeled off after high-power ultrasonic treatment, and is called graphene after reduction). , while ultrasonicating and stirring for 1 h;

[0037] Add (7.5g) hydrazine hydrate dropwise into the mixed solution (the mass ratio of graphite oxide to hydrazine hydrate is 1:1), and stir and reduce for 3h under the condition of 85°C oil bath;

[0038] Slowly pour the reduced solution into deionized water at 10°C in batches to precipitate...

Embodiment 2

[0043] Weigh (15g) graphite oxide and add DMF (amount ratio of 1g / 200ml), ultrasonically disperse for 3h; 28% to 30%), shredded and heated at a constant temperature in a 75°C oil bath to dissolve it in DMF (the dosage ratio is 1g / 30ml);

[0044] Slowly pour the rubber solution dissolved in DMF into the graphene oxide dispersion obtained after ultrasonic treatment, and simultaneously ultrasonically and stir for 1 h;

[0045] Add dropwise (13.5g) hydrazine hydrate (the mass ratio of graphite oxide to hydrazine hydrate is 1:0.9) into the mixed solution, and stir and reduce for 4h under the condition of 80°C oil bath;

[0046] Slowly pour the reduced solution into deionized water at 15°C in batches to precipitate the graphene / rubber composite material; dry the obtained composite material for 23 hours and start kneading, and then continue drying to constant weight; the barium ferrite Dry the magnetic powder at 45°C for 7 hours for later use;

[0047] Under room temperature condit...

Embodiment 3

[0051] Weigh (22.5g) graphite oxide and add DMF (amount ratio of 1g / 300ml), ultrasonically disperse for 3h; weigh (100g) nitrile rubber (model is Nandi 4155, Zhenjiang Nandi Chemical Co., Ltd., the content of acrylonitrile is 41 %), shredded and heated at a constant temperature in an oil bath at 80°C to dissolve it in DMF (amount ratio of 1g / 40ml);

[0052] Slowly pour the rubber solution dissolved in DMF into the graphene oxide dispersion obtained after ultrasonic treatment, while ultrasonic and stirring for 2h;

[0053] Add (24.75g) hydrazine hydrate dropwise into the mixed solution (the mass ratio of graphite oxide to hydrazine hydrate is 1:1.1), and stir and reduce for 3h under the condition of 85°C oil bath;

[0054] Slowly pour the reduced solution into deionized water at 20°C in batches to precipitate the graphene / rubber composite material; dry the obtained composite material for 22 hours and start kneading, and then continue drying to constant weight; the barium ferrit...

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Abstract

The invention discloses a flexible composite wave absorbing material applied to 5G mm wave band and a preparation method of the flexible composite wave absorbing material. The flexible composite absorbing material is prepared from the following raw materials in parts by weight: 100 parts of rubber, 120 to 150 parts of barium ferrite magnetic powder, 6 to 25 parts of graphite oxide, 5 to 10 parts of unsaturated carboxylate, 4 to 40 parts of hydrazine hydrate and 1 to 3.5 parts of a curing agent. The composite wave absorbing material prepared by the preparation method disclosed by the inventionhas excellent electrical and magnetic double loss characteristics and only a 2mm single layer composite material can achieve -40dB absorption loss at 26.5 to 40GHz waveband; by means of the compatibilization of unsaturated carboxylate, the composite wave absorbing material has excellent mechanical properties; the tensile strength of the composite material can be up to 9.09MPa when 10 parts of unsaturated carboxylate are added.

Description

technical field [0001] The invention relates to the technical field of electromagnetic wave-absorbing materials, in particular to a flexible composite wave-absorbing material applied in the 5G millimeter wave band and a preparation method thereof. Background technique [0002] The wide application of electromagnetic waves in the fields of electronic equipment and communication has provided people with a lot of convenience in life. However, the resulting electromagnetic pollution will also seriously affect human health and the normal use of electronic equipment. With the advent of the fifth generation mobile communication technology (5G), the millimeter wave frequency band above 24GHz is regarded as a potential application frequency band. Changes in the main frequency band in the communication field will inevitably lead to the update of related equipment and materials, such as materials used in various communication base stations, antenna test equipment and electronic termina...

Claims

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Application Information

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IPC IPC(8): C08L9/02C08K13/02C08K3/04C08K5/098C08K3/22
CPCC08K13/02C08K3/042C08K3/22C08K5/098C08K2201/003C08L9/02
Inventor 陈玉坤付兴凤
Owner SOUTH CHINA UNIV OF TECH
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