Method for manufacturing carbonyl iron foam wave-absorbing material
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A wave absorbing material, carbonyl iron technology, applied in the fields of radar wave absorption and functional materials, can solve the problems of large thickness, and achieve the effect of low surface density, good overall performance and good repeatability
Active Publication Date: 2015-04-22
PLA SECOND ARTILLERY ENGINEERING UNIVERSITY
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However, its thickness is relatively large, and it is only suitable for civilian fields such as microwave anechoic chambers.
At present, there is no report on the research of absorbing materials with soft polyurethane as the matrix and iron carbonyl as the absorber.
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Embodiment 1
[0021] Step 1: Accurately weigh 74g of carbonyl iron, 14g of acrylic resin, 8g of titanate coupling agent and 100g of absolute ethanol; dissolve the acrylic resin in absolute ethanol, and stir until it dissolves into a transparent and uniform solution;
[0022] Step 2: Add carbon black and titanate coupling agent to the above-mentioned adhesive glue, mechanically stir and sonicate for 30 minutes to prepare absorbent glue;
[0023] Step 3: Immerse soft polyurethane with a thickness of 4mm in the above glue, pull the filtrate, then soak again, repeat 3 times, finally drain the excess glue, and dry in a vacuum oven at 40°C ;
[0024] Step 4: Process the dried carbonyl iron foam absorbing material according to the specified size to obtain the finished product.
[0025] Depend on figure 1 It can be seen that the carbonyl iron in the carbonyl iron foam absorbing material prepared in this example is evenly distributed and is effectively compounded with soft polyurethane. Depend on...
Embodiment 2
[0027] Step 1: Accurately weigh 74g of the mixture of carbon black and carbonyl iron, 18g of acrylic resin, 8g of titanate 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 carbon black and titanate coupling agent to the above-mentioned adhesive glue, mechanically stir and sonicate 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 twice, finally drain the excess glue, and dry it in a vacuum oven at 40°C ;
[0030] Step 4: Process the dried carbonyl iron foam absorbing material according to the specified size to obtain the finished product.
[0031] Depend on image 3 It can be seen that the carbonyl iron foam absorbing material prepared in this example has good absorbing performance. The thickness is 3mm. When impregnated twic...
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Abstract
The invention relates to a carbonyl iron foam wave-absorbing material. Carbonyl iron which is large in magnetic loss, wave-absorbing strength and density is used as an absorbent to be added into a soft polyurethane foam base body, and the density and the mass of the carbonyl iron foam wave-absorbing material can be effectively reduced; the wave-absorbing performance of the material can be adjusted by changing the dipping times and the thickness of the base body, and the wave-absorbing material excellent in whole performance can be obtained. A method for manufacturing the carbonyl iron foam wave-absorbing material comprises the steps of preparing an adhesive glue solution, preparing an absorbent glue solution, dipping the soft polyurethane foam base body into the absorbent glue solution at multiple times repeatedly, removing an excess glue solution, placing the base body into a vacuum drying box to be dried, carrying out machining according to the specified dimension, and obtaining a finished product of the carbonyl iron foam wave-absorbing material. The overall wave-absorbing performance of the carbonyl iron foam wave-absorbing material is good, the surface density is low, the absorbed frequency is wide, the technology is simple and efficient, the repeatability is good, the radar wave absorbing effect is obvious, and the wide application prospect of the method in the radar camouflage field and the electromagnetic shielding field is displayed.
Description
technical field [0001] The invention belongs to the technical field of functional materials, and relates to a carbonyl iron foam wave-absorbing material and a preparation method thereof, which are specifically applied in the field of radar wave absorption. Background technique [0002] Carbonyl iron has the advantages of large magnetic loss and high wave absorption strength, and is one of the most commonly used magnetic absorbers at present. However, its application range is greatly limited due to the high density of carbonyl iron. Therefore, how to reduce the density of carbonyl iron absorbing materials without reducing the absorbing performance has become an urgent research problem. 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 matching. The request offers the possibility. Flexible polyurethane is a common type of...
Claims
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