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A kind of graphene/tetrapin zinc oxide whisker composite wave-absorbing material and its preparation method

A composite wave-absorbing material and zinc oxide whisker technology, 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: 2017-02-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The above two documents reflect that the preparation process of most of the existing wave-absorbing materials is complex, the reaction time is long, and it is difficult to achieve large-scale production. Narrow, large matching thickness and other issues
At the same time, many other wave absorbing agents generally have a high content, usually greater than 40wt%, or even more than 60wt%, which not only increases the density of the wave absorbing material, but also increases the production cost

Method used

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  • A kind of graphene/tetrapin zinc oxide whisker composite wave-absorbing material and its preparation method
  • A kind of graphene/tetrapin zinc oxide whisker composite wave-absorbing material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) take natural flake graphite as raw material, adopt Hummers method to prepare graphite oxide, then reduce graphite oxide to obtain reduced graphene oxide;

[0024] (2) Disperse the reduced graphene oxide in an alcohol solution, and ultrasonically treat it for 4 hours 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 graphene The mass fraction of ZnO is 5%, and the mass fraction of four-needle zinc oxide whiskers is 10%. Then carry out magnetic stirring for 30min, control the rotation speed to be 500rpm / min, and the temperature to be 30℃;

[0025] (3) Put the mixed solution in an oven to dry, keep the temperature at 80°C for 6h, and ensure that the whole drying process is gently stirred until dry, and the obtained powder is graphene / four-needle zinc oxide whisker with strong absorption and wide frequency band. composite absorbing material;

[0026] (4) T...

Embodiment 2

[0028] (1) take natural flake graphite as raw material, adopt Hummers method to prepare graphite oxide, then reduce graphite oxide to obtain reduced graphene oxide;

[0029] (2) Disperse the reduced graphene oxide in an alcohol solution, and ultrasonically treat it for 4 hours 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 graphene The mass fraction of ZnO is 5%, and the mass fraction of four-needle zinc oxide whiskers is 10%. Then carry out magnetic stirring for 30min, control the rotation speed to be 500rpm / min, and the temperature to be 30℃;

[0030] (3) Put the mixed solution in an oven to dry, keep the temperature at 80°C for 6h, and ensure that the whole drying process is gently stirred until dry, and the obtained powder is graphene / four-needle zinc oxide whisker with strong absorption and wide frequency band. composite absorbing material;

[0031](4) Th...

Embodiment 3

[0033] (1) take natural flake graphite as raw material, adopt Hummers method to prepare graphite oxide, then by reducing graphite oxide, obtain reduced graphene oxide;

[0034] (2) Disperse the reduced graphene oxide in an alcohol solution, and ultrasonically treat it for 4 hours 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 the graphene The mass fraction is 5%, the mass fraction of the four-needle zinc oxide whiskers is 10%, and the others are adhesives. Then magnetic stirring was performed for 30min, the control speed was 500rpm / min, and the temperature was 30℃;

[0035] (3) Dry the mixed solution in an oven, keep the temperature at 80°C for 6 hours, and ensure that the whole drying process is gently stirred until dry, and the obtained powder is graphene / four-needle zinc oxide whisker with strong absorption and wide frequency band. composite absorbing materi...

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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 / four-needle zinc oxide whisker composite wave absorbing material and a preparation method. Background technique [0002] With the rapid development of modern science and technology, electromagnetic radiation of different frequencies floods people's living space, destroys the good ecological environment of human beings, and causes serious electromagnetic pollution. Scientific research and facts show that electromagnetic waves are also very 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 lead to brain tumors. In addition, applying electromagnetic wave absorbing materials to electronic equipment can absorb leaked electromagnetic radiation, and can achieve the purpose of eliminating electromagnetic interference. In the i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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