Nano titanium oxide doped cement-base composite wave-absorbing material and preparation method thereof

Abstract

The invention relates to a cement-based absorbing composite absorbing material mixed with nano-titania and a preparation method thereof. The composite absorbing material consists of nano titania, dispersant, portland cement and water; a dispersion system comprises dispersant sodium hexametaphosphate and water, wherein, the dispersant sodium hexametaphosphate accounts for 0.3 percent to 0.7 percent by mass ratio of the weight of the dispersion system and the ratio between the water and dry materials, namely the water-cement ratio is between 0.32 to 0.38. The preparing steps of the invention are: a. nano-titania suspension is prepared by ultrasonic; b. the method of preparing cement-based composite absorbing material mixed with nano-titania. The invention mixes a small quantity of nano-titania absorbent into traditional cement materials, so the cement-based composite absorbing material has relatively good absorbing property and mechanical property and does not have many increased economic costs and has feasible and simple preparation technique.

Description

technical field [0001] The invention belongs to the technical field of building functional materials. Background technique [0002] Cement-based composite wave-absorbing material is a new type of material that has the function of absorbing electromagnetic waves by mixing wave-absorbing agents into cement or concrete. In terms of civilian use, it can be used to shield the radiation of electromagnetic waves on the human body to achieve the purpose of purifying the environment polluted by electromagnetic waves; it can also be used to prevent data leakage in the computer center and play a role in keeping secrets. In the military, cement-based composite absorbing materials can interfere with radar detection targets and weaken echo signals, so that radars cannot detect fixed targets on the ground or the detection accuracy is significantly reduced, avoiding enemy military strikes. Cement-based absorbing materials used for civil buildings have practical value for electromagnetic wa...

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Problems solved by technology

[0004] The frequency of electromagnetic waves shielded by the cement-based shielding materials studied above is almost in the tens of Hz to 1-2GHz. These cement-based shielding materials are mainly used to prevent the leakage of electromagnetic signals and external electromagnetic interference, and their shielding effect on electromagnetic waves is relatively low. Good, but the absorption attenuation and reflection attenuation of electromagnetic waves are poor; the absorbing properties of the cement-based absorbing materials studied are not ideal, and the mechanical properties of the cement-based composite materials mixed with ferrite absorbers are different. The degree is reduced, affecting the practical application

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