A kind of preparation method of multi-spectrum 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, improving wave-absorbing performance, and reducing specific gravity
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[0031] see Figure 1a - Fig. 3b, a kind of preparation method of multi-spectrum composite wave absorbing agent, comprises 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 organosilicon Modifier, the reaction obtains modified graphene oxide;
[0033] Step 2: Disperse the obtained modified graphene oxide in ethylene glycol to form a modified graphene oxide dispersion; FeCl 3 •6H 2 Add modified graphene oxide dispersion liquid again after O, acetate and Polyethylene Glycol are mixed mutually and stir;
[0034] Step 3: Using ethylene glycol as a solvent, hydrothermal reaction generates ferric oxide-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 is 0.9-...
Embodiment 1
[0042] (1) Take 100 mg of graphene oxide in a beaker, add 100 ml of absolute ethanol, and ultrasonically disperse for 30 minutes to form a uniform dispersion of graphene oxide; then transfer the graphene oxide dispersion to a 250ml flask and heat at 40 °C Slowly add 5 ml of ammonia silicon coupling reagent dropwise in the oil bath, the reaction time is 16-18 h, finally centrifuge, control the speed at 7500-8000r / min for 10 min, wash with absolute ethanol and deionized water for 3- 5 times to completely remove unreacted coupling agent, dry at 80°C for 24 hours, grind and store for future use.
[0043] (2) Disperse 50 mg of modified graphene oxide B1 prepared in (1) in 10 ml of ethylene glycol, ultrasonically disperse for 30-60 min; weigh 50 mg of FeCl 3 •6H 2 O, 0.6 g sodium acetate and 0.1 ml polyethylene glycol 200 were mixed with each other, dispersed in 10 ml ethylene glycol, ultrasonically dispersed for 30-60 min, and then the ethylene glycol dispersion of modified graphe...
Embodiment 2
[0045] (1) Take 100 mg of graphene oxide in a beaker, add 100 ml of absolute ethanol, and ultrasonically disperse for 30 minutes to form a uniform dispersion of graphene oxide; then transfer the graphene oxide dispersion to a 250 ml flask and heat at 60 °C Slowly add a small amount of 1 mol / L HCl solution dropwise in the oil bath to adjust the pH to about 3-4. After stirring for 0.5-1 h, slowly add 10 ml of non-ammonia silane coupling agent, continue the reaction for 4 h, and finally centrifuge to control Rotate at 7500-8000 r / min for 10 min, then wash with absolute ethanol and deionized water 3-5 times to completely remove unreacted coupling agent, dry at 80°C for 24 hours, grind and store for later use.
[0046] (2) Disperse the modified graphene oxide B2 or B3 prepared in (1) in ethylene glycol, ultrasonically disperse for 30-60 min; 3 •6H 2 O. Mix acetate and polyethylene glycol with each other, use ethylene glycol as solvent, ultrasonically disperse for 30-60 min, slowly...
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