Nano wave-absorbing agent doped single-layer cement-based wave absorber and preparation method thereof

Abstract

The invention discloses a nano wave-absorbing agent doped single-layer cement-based wave absorber and a preparation method thereof. The wave absorber is prepared from cement, silica fume, water, reduced graphene oxide, nano ferroferric oxide, nickel-plated multi-walled carbon nanotubes and a water reducing agent, and the silica fume, water, the reduced graphene oxide, the nano ferroferric oxide, the nickel-plated multi-walled carbon nanotubes and the water reducing agent account for the mass of the cement by 5-20%, 30-40%, 0.01-0.1%, 1-3%, 0.2-1.5% and 0.1-0.5% respectively. The preparation method includes steps: weighing required materials; pouring cement and silica fume into a stirring pot to stir uniformly, pouring nano ferroferric oxide and nickel-plated multi-walled carbon nanotubes into the stirring pot, and stirring for 2-5min at a low speed; adding dispersion liquid of reduced graphene oxide to mix uniformly; adding water and the water reducing agent, stirring in a stirrer for2-5min at a low speed, halting for 10-30s, performing high-speed stirring for 2-5min, injecting mixed paste into a mould for vibration forming, curing in a constant-temperature constant-humidity tank,demoulding after 24h, and continuing curing under the same conditions to obtain the wave absorber. The wave absorber is green, environmentally friendly and free of radioactivity, a preparation process is simple, and convenience in forming, availability for standard production and great building combination performance are realized.

Description

technical field [0001] The invention belongs to a novel modified cement-based composite material, and in particular relates to a single-layer cement-based wave-absorbing body compounded with nano wave-absorbing agents and a preparation method thereof. Background technique [0002] With the rapid development of the electronic information industry, electromagnetic waves, as an important carrier of information dissemination, have penetrated into all aspects of people's lives. Electromagnetic radiation is generated when electrical equipment is working, and it propagates to the surrounding environment in the form of conduction coupling and radiation coupling. At present, electromagnetic radiation has been listed as the fourth largest pollution source after water, air and noise by relevant organizations. Electromagnetic radiation not only reduces the use efficiency, performance and reliability of electronic equipment, but also reduces the service life and safety of electronic equ...

AI Technical Summary

Problems solved by technology

Traditional carbon-based materials such as graphite, modified graphite, and carbon black have good electrical conductivity and microwave absorption properties, but when they are mixed into cement-based materials, a "ball effect" will appear, which will significantly reduce the mechanical properties of the composite material.

[0010] At the same time, because it is difficult to achieve the goal of broadband absorption for single-component absorbers, the absorbing performance is often poor, which can no longer meet the requirements of high efficiency and light absorbing materials. Therefore, the preparation of nano-absorbers with both dielectric loss and magnetic loss Wave agent has become a hot spot in the field of wave-absorbing materials research

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