Method for preparing composite absorbing material

A composite wave absorbing material and graphene technology, applied in the field of electromagnetic wave absorbing material preparation, can solve problems such as difficulty in obtaining satisfactory results, and achieve the effect of wide absorption frequency band

Inactive Publication Date: 2018-11-27
GLOBAL ADVANCED TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The absorption of electromagnetic waves by polyaniline is mainly achieved through electrical loss, and it is difficult to achieve satisfactory results. Effective ways to achieve high conductivity or electromagnetic functions of polyaniline should be sought

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Add single-walled carbon nanotubes to 400mL concentrated sulfuric acid, let stand for 24h, then add 10.0g potassium permanganate, stir at room temperature for 1h, after ultrasound at 55℃ for 30min, adjust the temperature to 70℃ and continue ultrasound for 30min, cool to room temperature , Pour into 1.5L ice water, add 200mL H 2 O 2 , Stand for 24 hours, remove the supernatant, centrifuge the precipitate, and dry it in a vacuum at 50°C to obtain graphene oxide. Add graphene oxide to a small amount of deionized water, sonicate for 30min, add 300mL ammonia water, 300mL hydrazine hydrate, under condensed reflux conditions, heat the water bath to 95℃ for 1h, change the distillation device, distill most of the ammonia water, centrifuge the remainder, 50 Vacuum drying at ℃, grinding to obtain product graphene.

[0019] (2) Weigh 4.0g Co(NO 3 ) 2 ·6H 2 O, 11.30g Fe(NO 3 ) 3 ·9H 2 O was dissolved in deionized water, slowly poured into the solution containing 7.68g citric acid, ...

Embodiment 2

[0022] Graphene, CoFe 2 O 4 The preparation method is the same as that of step (1) and step (2) of Example 1. Weigh 0.20g graphene and 0.30gCoFe 2 O 4 , Measure 0.50mL aniline monomer, the preparation method is the same as the step (3) of Example 1 to obtain Graphene / CoFe 2 O 4 / Polyaniline composite wave absorbing material (X=0.20, Y=0.30, Z=0.50). The prepared composite material has a bandwidth of 14.5GHz with a reflectance loss value of less than -20dB in the range of 2-18GHz, and a minimum reflectivity loss of -41dB.

Embodiment 3

[0024] Graphene, CoFe 2 O 4 The preparation method is the same as that of step (1) and step (2) of Example 1. Weigh 0.30g graphene and 0.20gCoFe 2 O 4 , Measure 0.50mL aniline monomer, the preparation method is the same as the step (3) of Example 1 to obtain Graphene / CoFe 2 O 4 / Polyaniline composite wave absorbing material (X=0.30, Y=0.20, Z=0.50). The prepared composite material has a bandwidth of 12.4GHz with a reflectance loss value of less than -20dB in the range of 2-18GHz, and a minimum reflectance loss value of -43dB.

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Abstract

The invention provides a method for preparing a composite absorbing material. The method disclosed by the invention comprises the following steps: preparing graphene by taking single-walled carbon nanotubes having the tube diameter of 30-50nm as raw materials; preparing CoFe2O4 by taking Co(NO3)2.6H2O and Fe(NO3)3.9H2O as raw materials by adopting a sol-gel self-propagating combustion method; andfinally, taking the prepared graphene, CoFe2O4 and aniline monomers as raw materials, and preparing the graphene / CoFe2O4 / polyaniline composite material by adopting an in situ polymerization method. The composite material has excellent conductivity, magnetic property and stability, and has important application values in the fields of microwave absorption and electromagnetic shielding.

Description

Technical field [0001] The invention belongs to the field of preparation of electromagnetic wave absorbing materials, and particularly relates to a method for preparing composite wave absorbing materials. Background technique [0002] Ferrite nanopowders have excellent magnetic and electrical properties. In recent years, people have conducted extensive research on their synthesis and properties. CoFe with spinel crystal structure 2 O 4 It is a magnetic material with excellent performance. It has a mild saturation magnetization field and large coercivity, making it a very competitive new-generation magneto-optical recording material. [0003] The lattice structure of graphene is very stable, and the stability of this lattice structure is an important reason for many excellent properties of graphene. The most prominent feature is that the speed of electrons has reached 15000cm / V·s, which is equivalent to 1 / 300 of the speed of light, which far exceeds the speed of electrons in genera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/02C08K3/04C08K3/22
CPCC08G73/0266C08K3/22C08K2201/011C08K3/042
Inventor 徐江华林卫国谢宇徐波黄杰陆前峰
Owner GLOBAL ADVANCED TECH GRP
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