Preparation method of wave-absorbing material
A wave-absorbing material, nano-silver technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problem of low wave-absorbing efficiency of pure ferrite, achieve excellent electrical and thermal conductivity, stable performance, and improve wave-absorbing The effect of potency
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Embodiment 1
[0020] 1) Take 1 gram of graphene oxide powder and add 200 ml of deionized water, and ultrasonically disperse for 2 hours to obtain a graphene oxide dispersion;
[0021] 2) Add 200 grams of 2mol / L silver nitrate solution and 10 grams of dispersant polyvinylpyrrolidone to the prepared graphene oxide dispersion, stir for 2 hours, heat up to 40°C, and then add 20 grams of 0.5mol / L The hydrazine hydrate solution was reacted for 50 minutes under stirring conditions, and the pH value of the system was adjusted to 5 with a mass fraction of 5% ammonia solution. After the reaction was completed, the product was separated by centrifugation, washed 3 times with deionized water and ethanol, and dried Dry, prepare nano-silver-graphene composite material;
[0022] 3) Take 40 grams of the above-prepared nano-silver-graphene composite material and 60 grams of nickel-zinc ferrite, mix them, and ball mill for 3 hours. The particle size of the mixture is ≤ 2 μm, and the wave-absorbing material f...
Embodiment 2
[0024] 1) Add 1 gram of graphene oxide powder to 100 ml of deionized water, and ultrasonically disperse for 3 hours to obtain a graphene oxide dispersion;
[0025] 2) Add 50 grams of 2mol / L silver nitrate solution and 5 grams of dispersant polyvinylpyrrolidone to the prepared graphene oxide dispersion, stir for 1 hour, heat up to 50°C, and then add 15 grams of 0.5mol / L The hydrazine hydrate solution was reacted for 40 minutes under stirring conditions, and the pH value of the system was adjusted to 5 with an ammonia solution with a mass fraction of 2%. After the reaction was completed, the product was separated by centrifugation, washed twice with deionized water and ethanol, and dried Dry, prepare nano-silver-graphene composite material;
[0026] 3) Take 30 grams of the above-prepared nano-silver-graphene composite material and 70 grams of nickel-zinc ferrite, mix them, and ball mill for 2 hours. The particle size of the mixture is ≤ 2 μm, and the wave-absorbing material for ...
Embodiment 3
[0028] 1) Take 1 gram of graphene oxide powder and add 50 ml of deionized water, and ultrasonically disperse for 4 hours to obtain a graphene oxide dispersion;
[0029] 2) Add 17 grams of 2mol / L silver nitrate solution and 2.55 grams of dispersant polyvinylpyrrolidone to the prepared graphene oxide dispersion, stir for 1 hour, heat up to 60°C, and then add 8.5 grams of 0.5mol / L The hydrazine hydrate solution was reacted for 30 minutes under stirring conditions, and the pH value of the system was adjusted to 6 with an ammonia solution with a mass fraction of 2%. After the reaction was completed, the product was separated by centrifugation, washed twice with deionized water and ethanol, and dried Dry, prepare nano-silver-graphene composite material;
[0030] 3) Take 20 grams of the above-prepared nano-silver-graphene composite material and 80 grams of nickel-zinc ferrite, mix them, and ball mill for 2 hours. The particle size of the mixture is ≤ 2 μm, and the wave-absorbing mate...
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