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Compounded wave-absorbing material of grapheme/four-pin zinc oxide whisker and preparation method thereof

A technology of composite wave-absorbing materials and zinc oxide whiskers, which is applied in chemical instruments and methods, and other chemical processes, can solve the problems of small electromagnetic wave absorption peak, increase the density of wave-absorbing materials, and complicate the preparation process, and achieve wave-absorbing The effect of wide frequency band, reduced density, and simple preparation process

Active Publication Date: 2014-10-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The above two documents reflect that the preparation process of most of the existing wave-absorbing materials is complex, the reaction time is long, it is difficult to achieve large-scale production, and the prepared composite materials have absorption The wave performance is not good, the absorption peak of electromagnetic wave is small, the absorption frequency band is narrow, the matching thickness is large, etc.
At the same time, many other absorbing agents generally have a high content, usually greater than 40 wt%, or even more than 60 wt%, which not only increases the density of the absorbing material, but also increases the production cost

Method used

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  • Compounded wave-absorbing material of grapheme/four-pin zinc oxide whisker and preparation method thereof
  • Compounded wave-absorbing material of grapheme/four-pin zinc oxide whisker and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Using natural flake graphite as raw material, prepare graphite oxide by Hummers method, and then reduce graphite oxide to obtain reduced graphene oxide;

[0028] (2) Disperse the reduced graphene oxide into the alcohol solution, and ultrasonically treat it for 4 h to obtain a dispersion of reduced graphene oxide with a concentration of 0.5 mg / ml, and then add four needle-shaped zinc oxide whiskers to the dispersion to ensure that the graphite The mass fraction of alkene is 5%, and the mass fraction of tetrapod ZnO whiskers is 10%. Then carry out magnetic stirring for 30 min, control the rotation speed at 500 rpm / min, and the temperature at 30°C;

[0029] (3) Dry the mixed solution in an oven at a temperature of 80 °C for 6 h. During the entire drying process, ensure that it is gently stirred until it is dry. The obtained powder is graphene / tetraneedle zinc oxide crystal with strong absorption in a broad band Whiskers / hydroxyl iron powder composite absorbing materia...

Embodiment 2

[0032] (1) Using natural flake graphite as raw material, prepare graphite oxide by Hummers method, and then reduce graphite oxide to obtain reduced graphene oxide;

[0033](2) Disperse the reduced graphene oxide into the alcohol solution, and ultrasonically treat it for 4 h to obtain a dispersion of reduced graphene oxide with a concentration of 0.5 mg / ml, and then add four needle-shaped zinc oxide whiskers to the dispersion to ensure that the graphite The mass fraction of alkene is 5%, and the mass fraction of tetrapod ZnO whiskers is 10%. Then carry out magnetic stirring for 30 min, control the rotation speed at 500 rpm / min, and the temperature at 30°C;

[0034] (3) Dry the mixed solution in an oven at a temperature of 80 °C for 6 h. During the entire drying process, ensure that it is gently stirred until it is dry. The obtained powder is graphene / tetraneedle zinc oxide crystal with strong absorption in a broad band Whiskers / hydroxyl iron powder composite absorbing material...

Embodiment 3

[0037] (1) Using natural flake graphite as raw material, prepare graphite oxide by Hummers method, and then reduce graphite oxide to obtain reduced graphene oxide;

[0038] (2) Disperse the reduced graphene oxide into the alcohol solution, and ultrasonically treat it for 4 h to obtain a dispersion of reduced graphene oxide with a concentration of 0.5 mg / ml, and then add four needle-shaped zinc oxide whiskers to the dispersion to ensure that the graphite The mass fraction of alkene is 5%, the mass fraction of tetrapod zinc oxide whiskers is 10%, and the others are adhesives. Then carry out magnetic stirring for 30 min, control the rotation speed at 500 rpm / min, and the temperature at 30°C;

[0039] (3) Dry the mixed solution in an oven at a temperature of 80 °C for 6 h. During the entire drying process, ensure that it is gently stirred until it is dry. The obtained powder is graphene / tetraneedle zinc oxide crystal with strong absorption in a broad band Whiskers / hydroxyl iron p...

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Abstract

The invention discloses a compounded wave-absorbing material of grapheme / four-pin zinc oxide whisker and a preparation method thereof, and belongs to the field of microwave absorption. Natural scale graphite is used as a raw material to prepare reduction-oxidation graphene; the obtained reduction-oxidation graphene is dispersed into an alcohol solution for ultrasound treatment for 3-5 h to obtain reduction-oxidation graphene dispersion liquid with the concentration of 0.3-0.6 mg / ml; adding four-pin zinc oxide whisker into the reduction-oxidation graphene dispersion liquid, wherein the mass fraction of graphene is 4-8% and the mass fraction of four-pin zinc oxide whisker is 8-12%; performing magnetic mixing for 30-40 min wherein the rotating speed is controlled at 400-600 rpm / min and the temperature is controlled within 20-40 DEG C; placing the mixed solution into a drying oven for drying, and keeping the temperature at 60-80 DEG C for 6-8 h, so as to obtain the compounded wave-absorbing material. The preparation process is simple, the prepared wave-absorbing material is excellent in wave-absorbing property, strong in wave-absorbing ability, wide in wave-absorbing frequency band, and strong in regulatory property; high absorption at different frequency can be realized by thickness adjustment.

Description

technical field [0001] The invention relates to the field of microwave absorption, in particular to a graphene / tetrapin zinc oxide whisker composite microwave-absorbing material and a preparation method thereof. [0002] Background technique [0003] With the rapid development of modern science and technology, electromagnetic radiation of different frequencies floods people's living space, destroying the good ecological environment of human beings and causing serious electromagnetic pollution. Scientific research and facts have shown that electromagnetic waves are also extremely harmful to the human body. Excessive electromagnetic radiation can cause neurasthenia, loss of appetite, palpitations, chest tightness, dizziness and other "electromagnetic wave allergies", and even brain tumors. In addition, the application of electromagnetic absorbing materials in electronic equipment can absorb leaked electromagnetic radiation, and can achieve the purpose of eliminating electroma...

Claims

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Application Information

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IPC IPC(8): C09K3/00
Inventor 张跃章龙廖庆亮张光杰章潇慧丁一
Owner UNIV OF SCI & TECH BEIJING
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