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A kind of preparation method of light-weight broadband wave-absorbing material

A technology of wave absorbing material and bandwidth, applied in the field of functional materials, to achieve the effect of obvious absorption effect, broad application prospect and good repeatability

Active Publication Date: 2018-04-13
PLA SECOND ARTILLERY ENGINEERING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research on absorbing materials with soft polyurethane as the matrix and iron carbonyl / conductive carbon black as the absorber has not been reported yet.

Method used

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  • A kind of preparation method of light-weight broadband wave-absorbing material
  • A kind of preparation method of light-weight broadband wave-absorbing material
  • A kind of preparation method of light-weight broadband wave-absorbing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Step 1: Accurately weigh 85g of the mixture of conductive carbon black and carbonyl iron, 7g of acrylic resin, 8g of silane coupling agent, and 100g of absolute ethanol; dissolve the acrylic resin in absolute ethanol, and stir until it dissolves into a transparent homogeneous solution;

[0023] Step 2: Add conductive carbon black and silane coupling agent to the above-mentioned adhesive glue, mechanically stir and sonicate for 30 minutes to prepare absorbent glue;

[0024] Step 3: Immerse soft polyurethane with a thickness of 6mm in the above glue, pull the filtrate, then dip again, repeat 4 times, finally drain the excess glue, and dry it in a vacuum oven at 40°C ;

[0025] Step 4: Process the dried flexible polyurethane-based foam absorbing material according to the size specified in "GJB2038-94" to obtain the finished product.

Embodiment 2

[0027] Step 1: Accurately weigh 75g of the mixture of conductive carbon black and carbonyl iron, 21g of acrylic resin, 4g of silane coupling agent, and 100g of absolute ethanol; dissolve the acrylic resin in absolute ethanol, and stir until it dissolves into a transparent homogeneous solution;

[0028] Step 2: Add conductive carbon black and silane coupling agent to the above-mentioned adhesive glue, stir mechanically and ultrasonically for 45 minutes to prepare absorbent glue;

[0029] Step 3: Immerse soft polyurethane with a thickness of 3mm in the above glue, pull the filtrate, then dip again, repeat 3 times, finally drain the excess glue, and dry in a vacuum oven at 40°C ;

[0030] Step 4: Process the dried flexible polyurethane-based foam absorbing material according to the size specified in "GJB2038-94" to obtain the finished product.

[0031] Depend on image 3 It can be seen that the light-weight broadband wave-absorbing material prepared in this example has good wav...

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Abstract

The invention relates to a preparation method of a light-weight broadband wave-absorbing material. The substrate is soft spongy polyurethane, and then an absorbent, an adhesive and a coupling agent are added; the adhesive is dissolved in absolute ethanol and fully stirred until it dissolves into Transparent and uniform adhesive glue solution; adding absorbent and appropriate amount of coupling agent to the above adhesive glue solution to obtain absorbent glue solution; soaking the soft spongy polyurethane matrix in the absorbent glue solution, pulling and dipping repeatedly , and finally drain the excess glue, put it in a vacuum drying oven to dry, and process it according to the specified size to get the finished product. The process of the invention is simple and efficient, and has good repeatability. It can have different wave-absorbing properties by changing the proportion of glue, the amount of absorbent, the number of times of immersion, and the thickness of immersion. The overall performance is good, the surface density is low, and the absorption frequency band is wide. The radar wave absorption effect is obvious, and it has broad application prospects in the field of radar wave stealth and electromagnetic shielding.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a preparation method of a lightweight broadband wave-absorbing material, which is mainly used in radar wave absorption and electromagnetic shielding. Background technique [0002] Due to the limitation of the electromagnetic parameter characteristics of the absorber and the principle of the interference type absorbing material, the absorbing materials currently researched have problems such as narrow absorption frequency band and heavy mass. The main reason is that the characteristic impedance of the absorbing material does not match the spatial impedance, resulting in serious reflection of the electromagnetic wave before entering the absorbing material. On the one hand, the porosity of the matrix material can realize the transformation of the absorbing material from a single absorbing effect to a wave-transmitting-absorbing effect, and optimize impedance...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/40C08J9/42C08L75/04C09K3/00
Inventor 刘祥萱刘渊王煊军闻午
Owner PLA SECOND ARTILLERY ENGINEERING UNIVERSITY
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