Preparation method of wave-absorbing foam for absorbing low-frequency electromagnetic waves
An electromagnetic wave and foam technology, which is applied in the field of preparation of wave-absorbing foam, can solve the problem of low absorption performance of wave-absorbing foam, achieve good absorption effect, reduce density, and reduce weight
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[0038] Such as figure 1 Shown, a kind of preparation method for the wave-absorbing foam of low-frequency electromagnetic wave absorption, comprises the following steps:
[0039] S1. Mix graphene oxide powder, carbonyl iron powder, and water-based polyurethane emulsion evenly to obtain microwave-absorbing slurry A. The SEM image of microwave-absorbing slurry A is as follows figure 2 shown;
[0040] S2. After fully impregnating the first flexible polyurethane foam in the wave-absorbing slurry A in S1, perform thermal reduction in a Teflon reactor, the thermal reduction temperature is 85-95°C, and the thermal reduction time is 12-15 hours;
[0041] S3. After the reaction is completed, the foam after thermal reduction in S2 is fully rinsed with deionized water, and then dried to obtain a wave-absorbing foam that matches the absorbing layer;
[0042] S4. Mix multi-walled carbon nanotube powder, deionized water, surfactant, and water-based polyurethane emulsion evenly to obtain m...
Embodiment 1
[0050] 1) Mix 8.2 g of graphene oxide (GO) powder, 16.4 g of carbonyl iron powder, and 250 mL of water-based polyurethane emulsion with a solid content of 30% to obtain microwave-absorbing slurry A;
[0051] 2) After fully impregnating the flexible polyurethane foam with a size of 180 mm×180 mm×10 mm in the microwave-absorbing slurry A, transfer it to a Teflon reactor, and heat reduce it at 95 °C for 12 h;
[0052] 3) After the reaction is completed, take the foam out of the Teflon reactor and fully rinse it with deionized water, and then dry it to obtain a wave-absorbing foam that matches the absorbing layer;
[0053] 4) Mix 12.5 g of multi-walled carbon nanotubes, 400 mL of deionized water, 3.8 g of sodium dodecylsulfonate, and 100 mL of water-based polyurethane emulsion with a solid content of 30% to obtain microwave-absorbing slurry B;
[0054] 5) After fully impregnating the flexible polyurethane foam with a size of 180 mm×180 mm×10 mm in the absorbing slurry B, dry it to...
Embodiment 2
[0057] 1) Mix 8.2 g of graphene oxide (GO) powder, 8.2 g of carbonyl iron powder, and 250 mL of water-based polyurethane emulsion with a solid content of 30% to obtain wave-absorbing slurry A;
[0058] 2) After fully impregnating the flexible polyurethane foam with a size of 300 mm×300 mm×10 mm in the microwave-absorbing slurry A, transfer it to a Teflon reactor, and heat reduce it at 85 °C for 15 h;
[0059] 3) After the reaction is completed, take the foam out of the Teflon reactor and fully rinse it with deionized water, and then dry it to obtain a wave-absorbing foam that matches the absorbing layer;
[0060] 4) Mix 12.5 g of multi-walled carbon nanotubes, 400 mL of deionized water, 4 g of carbon nanotube water-based dispersant (TNWDIS), and 50 mL of water-based polyurethane emulsion with a solid content of 30% to obtain microwave-absorbing slurry B;
[0061] 5) After fully impregnating the flexible polyurethane foam with a size of 300 mm×300 mm×10 mm in the absorbing slur...
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