Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of microwave absorbing material and preparation method thereof

A microwave absorbing material and graphene technology, applied in the field of absorbing materials, can solve the problems of impedance mismatch, high conductivity, etc., achieve good absorbing performance, light weight, and solve the effect of impedance mismatch.

Active Publication Date: 2020-08-18
XIAN UNIV OF TECH
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of the inherent electromagnetic properties of graphene or carbon tubes, its high conductivity and dielectric constant cause a large number of electromagnetic waves to be reflected at the interface, and there is a problem of impedance mismatch.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of microwave absorbing material and preparation method thereof
  • A kind of microwave absorbing material and preparation method thereof
  • A kind of microwave absorbing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0036] A kind of preparation method of microwave absorbing material, specifically carries out according to following steps:

[0037] Step 1, adding polyvinyl alcohol to water to obtain a polyvinyl alcohol solution with a mass concentration of 10%;

[0038] Add graphene-cobalt ferrite, multi-walled carbon nanotubes and polyvinylpyrrolidone into water, wherein the mass ratio of graphene-cobalt ferrite to water is 1:71~1:23, the mass ratio of multi-walled carbon nanotubes to water The ratio is 1:71 to 1:69, the mass ratio of polyvinylpyrrolidone to water is 6:335 to 2:115, ultrasonically dispersed to obtain a dispersion;

[0039] Wherein, the graphene-cobalt ferrite is synthesized by a hydrothermal method, specifically according to the following steps:

[0040] Step 1.1, adding graphene and polyvinylpyrrolidone with a mass ratio of 3:1 into deionized water, and ultrasonically dispersing to obtain a graphene dispersion;

[0041] Step 1.2, Co(NO 3 ) 2 ·6H 2 O and Fe(NO 3 ) 3...

Embodiment 1

[0052] A kind of preparation method of microwave absorbing material, specifically carries out according to following steps:

[0053] Step 1, adding polyvinyl alcohol to water to obtain a polyvinyl alcohol solution with a mass concentration of 10%;

[0054] Graphene-cobalt ferrite, multi-walled carbon nanotubes and polyvinylpyrrolidone are added to water, wherein the mass ratio of graphene-cobalt ferrite to water is 1:71, and the mass ratio of multi-walled carbon nanotubes to water is 1: 71. The mass ratio of polyvinylpyrrolidone to water is 6:335, and ultrasonically dispersed to obtain a dispersion liquid;

[0055] Wherein, the graphene-cobalt ferrite is synthesized by a hydrothermal method, specifically according to the following steps:

[0056] Step 1.1, adding graphene and polyvinylpyrrolidone with a mass ratio of 3:1 into deionized water, and ultrasonically dispersing to obtain a graphene dispersion;

[0057] Step 1.2, Co(NO 3 ) 2 ·6H 2 O and Fe(NO 3 ) 3 9H 2 O joi...

Embodiment 2

[0064] A kind of preparation method of microwave absorbing material, specifically carries out according to following steps:

[0065] Step 1, adding polyvinyl alcohol to water to obtain a polyvinyl alcohol solution with a mass concentration of 10%;

[0066] Graphene-cobalt ferrite, multi-walled carbon nanotubes and polyvinylpyrrolidone are added to water, wherein the mass ratio of graphene-cobalt ferrite to water is 1:23, and the mass ratio of multi-walled carbon nanotubes to water is 1: 69. The mass ratio of polyvinylpyrrolidone to water is 2:115, and ultrasonically dispersed to obtain a dispersion liquid;

[0067] Wherein, the graphene-cobalt ferrite is synthesized by a hydrothermal method, specifically according to the following steps:

[0068] Step 1.1, adding graphene and polyvinylpyrrolidone with a mass ratio of 3:1 into deionized water, and ultrasonically dispersing to obtain a graphene dispersion;

[0069] Step 1.2, Co(NO 3 ) 2 ·6H 2 O and Fe(NO 3 ) 3 9H 2 O joi...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of a microwave absorbing material. The preparation method comprises following steps: preparing a polyvinyl alcohol solution, preparing a dispersion liquidof graphene-cobalt ferrite, multi-walled carbon nanotubes, and polyvinylpyrrolidone, adding the polyvinyl alcohol solution into the dispersion liquid, carrying out dispersing, allowing the system to stand still to obtain a mixed solution; freezing and unfreezing the mixed solution in cycle to obtain an unfrozen mixture; and drying the unfrozen mixture. The invention also discloses a microwave absorbing material, which as a foam structure. The prepared microwave absorbing material has a wide absorption band and low reflection loss (less than -10Db) in a range of 8.8-12.4 GHz; in the X waveband,the material has a good wave absorbing performance, the problem of impedance mismatch of graphene is also solved, and the material has a foam structure, is light, and has low interface reflection.

Description

technical field [0001] The invention belongs to the field of microwave absorbing materials, and in particular relates to a microwave absorbing material, and also relates to a preparation method of the microwave absorbing material. Background technique [0002] With the rapid development of information technology, high-performance broadband and lightweight microwave absorbing materials (MAMs) play an important role in human health, information security, military stealth, and electromagnetic interference (EMI) elimination. more attention. [0003] It is generally believed that the interface impedance matching and electromagnetic wave loss are the two main factors affecting the microwave absorption (MA) performance of materials, and the dielectric constant and magnetic permeability are the most important factors affecting the interface impedance matching and electromagnetic wave loss. The fundamental way to improve the absorption frequency bandwidth is to optimize the physical...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08L29/04C08L39/06C08K3/04C08K3/24C08J9/28
CPCC08J9/28C08J2201/0484C08J2329/04C08J2439/06C08K3/041C08K3/042C08K3/24C08K2201/003C08K2201/011
Inventor 任芳石艳飞任鹏刚郭铮铮
Owner XIAN UNIV OF TECH