Cement-based wave-absorbing material doped by graphene oxide and preparation method thereof
A technology of wave absorbing material and graphene, applied in the field of cement-based wave absorbing material doped with graphene oxide and its preparation, can solve the problems of narrow frequency band, undiscovered, unable to reach broadband, etc. The effect of remarkable electromagnetic wave shielding performance and convenient forming
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Embodiment 1
[0033] A preparation method of a cement-based wave-absorbing material mixed with graphene oxide, comprising the steps of: weighing the cement for later use, taking the cement mass as 1, weighing 10% silica fume according to the mass ratio, pouring the two into a stirring pot and stirring Evenly, after stirring evenly, weigh 2% nano ferric oxide and 0.7% nano nickel, and stir at a low speed for 2.5min; then add the dispersion of graphene oxide (0.05%) to the stirred mixture, and ultrasonically vibrate; finally Weigh 42% water and 0.5% water reducer, add to the mixture, stir the mixer at low speed for 2.5min, stop for 20s, stir at high speed for 2.5min, pour the mixed slurry into 300×300×30mm 3 The mold is formed by vibration, and placed in a constant temperature and humidity box. The temperature is kept at 18-22°C, and the relative humidity is >90%. After 24 hours, the mold is demoulded and continued to be cured under this condition for 7d, 28d and 28d. After that, continue to b...
Embodiment 2
[0036] A preparation method of a cement-based wave-absorbing material mixed with graphene oxide, comprising the steps of: weighing the cement for later use, taking the cement mass as 1, weighing 10% silica fume according to the mass ratio, pouring the two into a stirring pot and stirring Evenly, after stirring evenly, weigh 2% nano-ferric oxide and 2.1% nano-nickel, and stir at a low speed for 3 minutes; then add a dispersion of graphene oxide (0.03%) to the stirred mixture, and ultrasonically oscillate; finally weigh Take 40% water and 0.4% water reducing agent, add to the mixture, stir the mixer at low speed for 2.5min, stop for 15s, stir at high speed for 2min, inject the mixed slurry into 300×300×30mm 3 The mold is formed by vibration, and placed in a constant temperature and humidity box. The temperature is kept at 18-22°C, and the relative humidity is >90%. After 24 hours, the mold is demoulded and continued to be cured under this condition for 7d, 28d and 28d. After that...
Embodiment 3
[0039] A preparation method of a cement-based wave-absorbing material mixed with graphene oxide, comprising the steps of: weighing the cement for later use, taking the cement mass as 1, weighing 10% silica fume according to the mass ratio, pouring the two into a stirring pot and stirring Evenly, after stirring evenly, weigh 2% nanometer ferric oxide and 0.7% nanometer nickel, and stir at a low speed for 2 minutes; then add a dispersion of graphene oxide (0.01%) to the stirred mixture, and ultrasonically oscillate; finally weigh Take 42% water and 0.5% water reducer, add to the mixture, stir the mixer at low speed for 2 minutes, stop for 10 seconds, stir at high speed for 2 minutes, inject the mixed slurry into 300×300×30mm 3 The mold is formed by vibration, and placed in a constant temperature and humidity box. The temperature is kept at 18-22°C, and the relative humidity is >90%. After 24 hours, the mold is demoulded and continued to be cured under this condition for 7d, 28d a...
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