Preparation method of multi-spectral composite wave-absorbing agent
A wave-absorbing agent and multi-spectrum technology, which is applied in the field of preparation of multi-spectrum composite wave-absorbing agents, can solve problems such as the inability to realize frequency band diversification, and achieve the effects of broadening the wave-absorbing range, reducing specific gravity, and improving wave-absorbing performance
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[0031] see Figure 1a-Figure 4 , a preparation method of a multi-spectrum composite wave absorbing agent, comprising the following steps:
[0032] Step 1: Prepare modified graphene oxide with organosilicon modifier and graphene oxide as raw materials; dissolve graphene oxide in absolute ethanol, pour it into a flask, put the flask into an oil bath and slowly add ammonia Organosilicon modifier, reacted to obtain modified graphene oxide;
[0033] Step 2: Disperse the obtained modified graphene oxide in ethylene glycol to form a modified graphene oxide dispersion; 3 ·6H 2 O, acetate and polyethylene glycol are mixed with each other and then the modified graphene oxide dispersion is added to stir;
[0034] Step 3: using ethylene glycol as a solvent, a hydrothermal reaction generates a ferric tetroxide-modified reduced graphene oxide composite wave absorbing agent.
[0035] In step 1, the mass concentration of the solution formed by dissolving graphene oxide in absolute ethanol...
Embodiment 1
[0042] (1) Take 100 mg of graphene oxide in a beaker, add 100 ml of absolute ethanol, and ultrasonically disperse for 30 min to form a uniform dispersion of graphene oxide; then transfer the graphene oxide dispersion to a 250 ml flask, and in a 40°C oil bath Slowly add 5ml of ammonia-based silicon coupling reagent dropwise, the reaction time is 16-18h, and finally centrifuge, control the rotation speed at 7500-8000r / min, the time is 10min, wash with absolute ethanol and deionized water 3-5 times, and completely remove the residue. The reacted coupling agent was dried at 80°C for 24h, ground and stored for later use.
[0043] (2) Disperse 50mg of modified graphene oxide B1 prepared in (1) in 10ml of ethylene glycol, and ultrasonically disperse for 30-60min; weigh 50mg of FeCl 3 ·6H 2 O, 0.6g of sodium acetate and 0.1ml of polyethylene glycol 200 were mixed with each other, dispersed in 10ml of ethylene glycol, ultrasonically dispersed for 30-60min, and then slowly added dropwi...
Embodiment 2
[0045] (1) Take 100 mg of graphene oxide in a beaker, add 100 ml of absolute ethanol, and ultrasonically disperse for 30 min to form a uniform dispersion of graphene oxide; then transfer the graphene oxide dispersion to a 250 ml flask, in an oil bath at 60°C Slowly add a small amount of 1mol / L HCl solution dropwise, adjust pH=3-4, stir for 0.5-1h, slowly add 10ml non-ammonia silane coupling agent, continue to react for 4h, and finally centrifuge, control the speed at 7500-8000r / min for 10 min, and then washed with absolute ethanol and deionized water for 3-5 times to completely remove the unreacted coupling agent, dried at 80 °C for 24 h, and stored for later use after grinding.
[0046] (2) Disperse the modified graphene oxide B2 or B3 prepared in (1) in ethylene glycol, and ultrasonically disperse for 30-60 min; 3 ·6H 2 O, acetate and polyethylene glycol are mixed with each other, and ethylene glycol is used as a solvent, ultrasonically dispersed for 30-60min, slowly dropwi...
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