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Hierarchical structure wave absorbing agent and preparation method thereof

A technology of hierarchical structure and wave absorbing agent, which is applied in the field of hierarchical structure wave absorbing agent and its preparation, can solve the problems of small effective absorption bandwidth of reflection loss, enhanced electromagnetic wave reflection of composites, and increased dielectric constant of composites, etc. The effect of light weight, simple preparation method, and simple and easy-to-obtain raw materials

Active Publication Date: 2018-02-16
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But its absorbing ability is poor, the minimum reflection loss (-17.8dB) and the effective absorption broadband (2.5GHz) are small
[0006] However, due to the superior electrical properties of graphene (RGO), too much graphene loading may enhance the direct reflection of electromagnetic waves by the composite, resulting in the inability of electromagnetic waves to enter the material effectively, resulting in a sharp increase in the dielectric constant of the composite. , the complex’s reflection of electromagnetic waves is enhanced, which is not conducive to the further loss and absorption of electromagnetic waves by the compound

Method used

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  • Hierarchical structure wave absorbing agent and preparation method thereof
  • Hierarchical structure wave absorbing agent and preparation method thereof
  • Hierarchical structure wave absorbing agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] A preparation method of hierarchical structure wave absorbing agent:

[0036] (1) Weigh 1.352g FeCl respectively 3 ·6H 2 O and 0.845MgSO 4 ·7H 2 O was dissolved in 40 mL of ethylene glycol solution, then 3.6 g of NaAc and 1.0 g of polyethylene glycol were added, and stirred ultrasonically for 0.5 hours. The resulting mixture was transferred into a stainless steel reaction kettle, reacted at 180°C for 12 hours, cooled naturally to room temperature, and filtered. The solid phase was washed three times with deionized water and ethanol respectively, the solid phase was ultrasonically dispersed in 20mL of deionized water, and 0.5mL of 3-aminopropyl-trimethoxysilane was added to stir evenly, and the reaction was refluxed at 100°C for 8h, and the obtained solid Particles were redispersed in 20mL deionized water, and recorded as mixed solution A; another 0.5g expandable graphite (EG) and 3.0g KMnO 4 Place in a 500mL three-necked flask, stir and mix evenly, slowly add 60mL ...

Embodiment 2

[0041] A preparation method of hierarchical structure wave absorbing agent:

[0042] (1) Weigh 2.702g FeCl respectively 3 ·6H 2 O and 1.690MgSO 4 ·7H 2 O was dissolved in 60 mL of ethylene glycol solution, then 7.2 g of NaAc and 2.0 g of polyethylene glycol were added, and stirred ultrasonically for 1.0 hour. The resulting mixture was transferred into a stainless steel reaction kettle, reacted at 200°C for 12 hours, cooled naturally to room temperature, and filtered. Mixed solution A (1.0mL3-aminopropyl-trimethoxysilane) was prepared according to the method of step (1) of Example 1; another 1.0g expandable graphite (EG) and 6.0g KMnO were weighed 4 Place in a 500mL three-necked flask, stir and mix evenly, slowly add 140mL of concentrated H with a volume ratio of 1:9 3 PO 4 and concentrated H 2 SO 4 The mixed solution was prepared according to the method of Example 1 step (1) (RGO content is about 2mg / mL); solution B was added dropwise to the mixed solution A, and the p...

Embodiment 3

[0047] A preparation method of hierarchical structure wave absorbing agent:

[0048] (1) Weigh 4.056g FeCl respectively 3 ·6H 2 O and 2.535MgSO 4 ·7H 2 O was dissolved in 80 mL of ethylene glycol solution, then 10.8 g of NaAc and 3.0 g of polyethylene glycol were added, and stirred ultrasonically for 1.5 hours. The resulting mixture was transferred into a stainless steel reaction kettle, reacted at 220° C. for 12 hours, cooled naturally to room temperature, and filtered. Mixed solution A (1.5mL3-aminopropyl-trimethoxysilane) was prepared according to the method of step (1) of Example 1; another 1.5g expandable graphite (EG) and 9.0g KMnO were weighed 4 Place in a 500mL three-necked flask, stir and mix evenly, slowly add 200mL of concentrated H with a volume ratio of 1:9 3 PO 4 and concentrated H 2 SO 4 The mixed solution was prepared according to the method of Example 1 step (1) (RGO content is about 3mg / mL); solution B was added dropwise to the mixed solution A, and i...

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Abstract

The invention discloses a hierarchical structure wave absorbing agent and a preparation method thereof. The wave absorbing agent is composed of a ternary compound and a film former, the ternary compound is of a hierarchical coated structure and contains a binary metal oxide, RGO and MnO2, the RGO is coated outside the binary metal oxide, and the MnO2 is coated outside the RGO. The binary compoundis a magnetic loss medium, and the RGO is a dielectric loss and conductive loss medium. The wave absorbing agent not only integrates magnetic loss with electrical loss, but also greatly enhances interface polarization of the compound on electromagnetic waves through the design of the hierarchical ordered coated structure. The outermost MnO2 is not only conducive to incidence of electromagnetic waves, but also can effectively reduce direct reflection of the RGO on the electromagnetic waves, and further enhances the wave absorbing performance of the compound.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a hierarchical structure wave absorbing agent and a preparation method thereof. Background technique [0002] With the rapid development of modern electronic information technology, the negative impact of electromagnetic radiation on the environment and human health is becoming increasingly serious. Therefore, it is very important to prepare a material that can effectively shield and absorb electromagnetic waves. However, due to the complexity of electromagnetic waves, it is still a very difficult task to prepare high-efficiency absorbers with light weight, thin thickness, strong absorption, and wide frequency band. [0003] Generally speaking, the absorption of electromagnetic waves by microwave absorbers mainly depends on two loss mechanisms, namely dielectric loss and magnetic loss. Fe 3 o 4 , barium ferrite, manganese ferrite and other ferromagnetic materials, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00
CPCH05K9/0081
Inventor 冯建涛杨武国吴云飞李军华
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD