Preparation method of light bandwidth wave-absorbing material
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A wave-absorbing material and bandwidth technology, applied in the field of functional materials, to achieve the effect of simple and efficient process, wide absorption frequency band and low surface density
Active Publication Date: 2015-04-22
PLA SECOND ARTILLERY ENGINEERING UNIVERSITY
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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.
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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 bandwidth wave-absorbing material. A substrate of the light bandwidth wave-absorbing material is soft spongy polyurethane, and then absorbing agents, adhesives and coupling agents are added; the adhesives are dissolved in absolute ethyl alcohol and sufficiently stirred until transparent uniform adhesive liquid cement is obtained through dissolving; the absorbing agents and the appropriate quantity of coupling agents are added to the adhesive liquid cement to obtain absorbing agent liquid cement; the soft spongy polyurethane substrate is dipped in the absorbing agent liquid cement and then is repeatedly lifted and dipped, surplus liquid cement is finally discharged, the dipped substrate is placed in a vacuum drying oven to be dried and is machined according to a specified dimension, and a finished product is obtained. According to the method, processes are simple and efficient, repeatability is good, different wave-absorbing properties can be achieved by changing the liquid cement ratio, the quantity of the absorbing agents, the number of dipping times and the dipping thickness, overall performance is good, surface density is low, and the absorbing frequency band is wide. The light bandwidth wave-absorbing material has an obvious radar wave absorbing effect and has wide application prospects in the radar wave hiding field and the electromagnetic shielding field.
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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