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

Lightweight broadband electromagnetic wave absorbing material and preparation method thereof

An absorbing material and broadband technology, applied in the field of light-weight broadband electromagnetic wave absorbing materials and their preparation, can solve the problems of high price of absorbing materials, difficult to meet the needs of use, short distance of components, etc., and achieve the increase and decrease of electromagnetic wave absorption efficiency. Risk of electrical short circuit, effect of resistivity drop

Inactive Publication Date: 2021-11-16
江苏穗实科技有限公司
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So electronic components are installed in electronic equipment at high density and the distance between components is short, making them susceptible to electromagnetic noise and prone to problems
However, most of the existing light and thin electromagnetic wave absorbing materials for electronic equipment are made of composite magnetic materials composed of soft magnetic material powder and organic binders kneaded into resin by kneading. Because the magnetic powder is expensive, Therefore, the absorbing material is expensive, and the weight is relatively heavy when it is very thin, which is difficult to meet people's needs

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
  • Lightweight broadband electromagnetic wave absorbing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The invention provides a light-weight broadband electromagnetic wave absorbing material, which includes non-woven fabric, and the non-woven fabric includes the following raw materials in weight percentage: 85% of non-conductive fiber, 10% of modified carbon fiber and 5% of flame retardant, The surface resistivity of the non-woven fabric is 46.5Ω / mouth, and the density of the non-woven fabric is 17.4g / m 2 .

[0025] In a preferred embodiment, the thickness of the non-woven fabric is 60um, the non-conductive fibers are impregnated resin fibers, and the impregnated resin fibers are acrylic resin emulsion, water-soluble acrylic resin solution or water-soluble polyurethane dispersion One of them, the flame retardant is a boron-based flame retardant.

[0026] In a preferred embodiment, one or both sides of the non-woven fabric are laminated with a protective film or an adhesive, and the length of the modified carbon fiber is 5.0 mm.

[0027] A method for preparing a lightwe...

Embodiment 2

[0037]The invention provides a light-weight broadband electromagnetic wave absorbing material. The non-woven fabric includes the following raw materials in weight percentage: 81% of non-conductive fiber, 15% of modified carbon fiber and 4% of flame retardant. The non-woven fabric The surface resistivity is 26.5Ω / port, and the density of the non-woven fabric is 17.4g / m 2 .

Embodiment 3

[0039] Different from Examples 1 and 2, the present invention provides a light-weight broadband electromagnetic wave absorbing material, and the non-woven fabric includes the following raw materials in weight percentage: 77% of non-conductive fiber, 20% of modified carbon fiber and resistance Combustion agent 3%, the surface resistivity of described non-woven fabric is 20Ω / port, and the density of described non-woven fabric is 17.3g / m 2 .

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
Densityaaaaaaaaaa
Thicknessaaaaaaaaaa
Lengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a lightweight wide-frequency-band electromagnetic wave absorbing material, particularly relates to the technical field of electromagnetic wave absorbing materials. The lightweight wide-frequency-band electromagnetic wave absorbing material a non-woven fabric; the non-woven fabric comprises the following raw materials of: non-conductive fibers, modified carbon fibers and a flame retardant, the surface resistivity of the non-woven fabric is 8-80 omega / square, and the density of the non-woven fabric is 4-35 g / m < 2 >. The non-conductive fibers fills with the modified carbon fibers by adopting a yarn mixing process; the modified carbon fibers are densely interwoven in the non-woven fabric in the vertical direction and the horizontal direction, so that the non-woven fabric has certain conductivity in the vertical direction and the horizontal direction, when electromagnetic waves or electromagnetic noise is projected to the surface of the non-woven fabric, a very small amount of electromagnetic waves or electromagnetic noise is reflected by the surface, most of electromagnetic waves or electromagnetic noise permeates into the wave-absorbing material body to carry out resistance loss, the carbon fibers are subjected to ozone oxidation pretreatment and then adsorb polypyrrole, nano silicon dioxide and nano carbon black, the electric conductivity of the carbon fibers can be improved, the surface resistivity of the non-woven fabric is reduced, and the electromagnetic wave absorption efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of electromagnetic wave absorbing materials, more specifically, the invention relates to a light-weight broadband electromagnetic wave absorbing material and a preparation method thereof. Background technique [0002] With the rapid development of microwave electronic technology, a large number of electronic instruments and equipment have been widely used in military and civilian fields. The radiated electromagnetic waves generated by electronic instruments and equipment will cause electromagnetic interference to other electronic products, thus directly affecting the normal realization of the functions of electronic devices; the generated electromagnetic pollution will cause serious harm to humans and other organisms. As the frequency of use increases, due to the electromagnetic wave noise generated by electronic equipment, it is easy to cause other equipment to malfunction, and due to interference with the ...

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
IPC IPC(8): H05K9/00D06M15/37D06M13/342D06M11/79D06M11/74D06M11/34
CPCH05K9/009D06M11/34D06M13/342D06M15/37D06M11/79D06M11/74D06M2101/40
Inventor 向小玲熊泽宣喜
Owner 江苏穗实科技有限公司