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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

Inactive Publication Date: 2017-11-03
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The cement-based material mixed with a single conductive wave-absorbing filler only has good absorption and shielding performance for electromagnetic waves in a certain frequency range, but the frequency band is narrow and cannot achieve the purpose of broadband. The double-mixing method is an effective method to solve the bandwidth.
The search found that no research has been found on compounding graphene oxide, nano-ferric oxide and nano-nickel into cement slurry to improve the electromagnetic wave absorption and shielding performance of cement slurry

Method used

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  • Cement-based wave-absorbing material doped by graphene oxide and preparation method thereof
  • Cement-based wave-absorbing material doped by graphene oxide and preparation method thereof
  • Cement-based wave-absorbing material doped by graphene oxide and preparation method thereof

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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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Abstract

The invention discloses a cement-based wave-absorbing material doped by graphene oxide and a preparation method thereof. The preparation method comprises the following steps: weighing cement for subsequent usage; weighing silica fume according to a certain mass ratio, pouring the cement and silica fume into a stirring pot, carrying out uniform mixing under stirring, then weighing nanometer ferriferrous oxide and nanometer nickel according to a certain mass ratio, pouring the weighed nanometer ferriferrous oxide and nanometer nickel into the stirring pot and carrying out low-speed stirring for 2 to 5 min; adding dispersion liquid of graphene oxide into a mixture obtained in the previous step and carrying out ultrasonic vibration; and finally, weighing water and a water reducer according to a mass ratio, adding the weighed water and water reducer into the mixture, carrying out low-speed stirring with an agitator for 2 to 5 min, stopping stirring for 10 to 30 s, then carrying out high-speed stirring for 2 to 5 min, injecting obtained slurry into a mold, carrying out vibration molding, then carrying out maintenance in a constant-temperature constant-humidity case, carrying out demolding in 24 h and then continuing maintenance under same conditions so as to obtain the cement-based wave-absorbing material. The cement-based wave-absorbing material doped by graphene oxide has the advantages of good wave absorption performance, wide frequency range, environment friendliness and no radioactivity; the preparation method is simple in process, easy in shaping and suitable for standard production; and the prepared material can be well bonded with buildings.

Description

technical field [0001] The invention belongs to a novel modified cement-based composite material, in particular to a cement-based wave-absorbing material mixed with graphene oxide and a preparation method thereof. Background technique [0002] At present, electromagnetic wave radiation has been listed as the fourth largest pollution source after water pollution, air pollution and noise pollution by relevant organizations. Cement-based materials have abundant resources and good environmental adaptability, and are the main source of building materials, but they have weak electromagnetic wave absorption and shielding properties, and are almost transparent to electromagnetic waves. Add wave-absorbing fillers to cement-based materials, use its high conductivity to form a closed conductive path to prevent electromagnetic waves from penetrating, and convert electromagnetic waves transmitted to cement-based materials into heat or other forms of energy consumption. This technical pa...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B14/02C04B14/30C04B14/34C04B20/00
CPCC04B28/04C04B14/024C04B14/308C04B14/34C04B20/008C04B2111/00258C04B2201/50C04B18/146C04B22/002C04B24/24
Inventor 孙亚飞高培伟刘宏伟周天舒李隽陈敏
Owner YANCHENG INST OF TECH
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