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Ultra-light graphene foam material with effects of sound absorption and noise reduction and preparation method of ultra-light graphene foam material

A graphene foam and noise reduction technology, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of unsatisfactory medium and low frequency sound absorption coefficient, limited medium and low frequency sound absorption performance, and no corrosion resistance. Excellent sound absorption effect, simple method, excellent corrosion resistance and flame retardant performance

Active Publication Date: 2019-07-12
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these materials usually have disadvantages such as large mass, no corrosion resistance, easy water absorption, and no fire resistance, and the sound absorption coefficient at medium and low frequencies is not ideal.
Based on this, there are many studies on cheap, lightweight, and thermally stable carbon materials, but most of the research on the sound absorption performance of carbon materials is to partially carbon-doped existing sound-absorbing materials. Although the overall performance has been improved, the Low-frequency sound absorption performance is still limited

Method used

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  • Ultra-light graphene foam material with effects of sound absorption and noise reduction and preparation method of ultra-light graphene foam material
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  • Ultra-light graphene foam material with effects of sound absorption and noise reduction and preparation method of ultra-light graphene foam material

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Experimental program
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Effect test

Embodiment 1

[0030] (1) prepare the graphene oxide solution that concentration is 7mg / mL;

[0031] (2) 50mL graphene oxide solution, 1mL Tween 80 and 6mL absolute ethanol were mixed, then mechanically stirred at a speed of 3000r / min for 5min, and the volume of the mixed solution was expanded to twice the volume before stirring to obtain graphite oxide Alkene wet foam;

[0032] (3) Place a 5mm thick plastic plate on the surface of liquid nitrogen, and then place the beaker with graphene oxide wet foam on the plastic plate to freeze, avoid direct contact between the beaker and liquid nitrogen, freeze for 20 minutes, and then transfer to freeze-dry Freeze-drying in the machine, freeze-drying at a vacuum degree of 10Pa and a temperature of -53°C for 60h to obtain a graphene oxide foam;

[0033] (4) Place the graphene oxide foam in a muffle furnace, heat it to 200°C in an air atmosphere, and keep it warm for 2 hours to obtain a sound-absorbing and noise-reducing ultra-light graphene foam mater...

Embodiment 2

[0037] (1) prepare the graphene oxide solution that concentration is 5mg / mL;

[0038] (2) 50mL graphene oxide solution, 1mL Tween 80 and 6mL absolute ethanol were mixed, then mechanically stirred at a speed of 3000r / min for 5min, and the volume of the mixed solution was expanded to 2.5 times the volume before stirring to obtain graphite oxide Alkene wet foam;

[0039] (3) Place a 5mm thick plastic plate on the surface of liquid nitrogen, and then place the beaker with wet graphene oxide foam on the plastic plate to freeze, avoid direct contact between the beaker and liquid nitrogen, freeze for 30 minutes, and then transfer to freeze-dry Freeze-drying in the machine, freeze-drying at a vacuum degree of 10Pa and a temperature of -53°C for 60h to obtain a graphene oxide foam;

[0040] (4) Place the graphene oxide foam in a muffle furnace, heat it to 200°C in an air atmosphere, and keep it warm for 2 hours to obtain a sound-absorbing and noise-reducing ultra-light graphene foam m...

Embodiment 3

[0044] (1) prepare the graphene oxide solution that concentration is 5mg / mL;

[0045] (2) Mix 70mL graphene oxide solution, 1.5mL Tween 80, and 8mL absolute ethanol, and then mechanically stir rapidly at a speed of 3000r / min for 7min, so that the volume of the mixed solution expands to 2.5 times the volume before stirring to obtain the oxidized Graphene wet foam;

[0046] (3) Place a 5mm thick plastic plate on the surface of liquid nitrogen, and then place the beaker with wet graphene oxide foam on the plastic plate to freeze, avoid direct contact between the beaker and liquid nitrogen, freeze for 40 minutes, and then transfer to freeze-dry Freeze-drying in the machine, freeze-drying at a vacuum degree of 10Pa and a temperature of -53°C for 72h to obtain a graphene oxide foam;

[0047] (4) Place the graphene oxide foam in a muffle furnace, heat it to 200°C in an air atmosphere, and keep it warm for 2 hours to obtain a sound-absorbing and noise-reducing ultra-light graphene fo...

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Abstract

The invention relates to an ultra-light graphene foam material with effects of sound absorption and noise reduction and a preparation method of the ultra-light graphene foam material, and belongs to the technical field of graphene based three-dimensional materials. The material is of a three-dimensional structure formed by regular macropores, irregular micropores between the macropores and throughpores in the pore walls, and by means of the three pore structures, all parts are relatively independent and are also communicated one another, a diffusion path of sound waves and a contact area withmaterial walls are increased and dissipation of sound energy is increased. Besides, the three-dimensional framework of the material consists of thinner graphene walls and ultrafine graphene fibers, so that bending vibration of the material in the presence of sounds is facilitated, and the sound energy is converted into kinetic energy for further consumption. The preparation method of the materialis simple, safe and environmentally friendly, the material has an excellent sound absorption effect in the whole frequency band, especially in the low-mid frequency band, the efficient sound absorption frequency band is in a range of 600 Hz-6300 Hz, and the material has great application prospects.

Description

technical field [0001] The invention relates to a sound-absorbing and noise-reducing ultra-light graphene foam material and a preparation method thereof, belonging to the technical field of graphene-based three-dimensional materials. Background technique [0002] Noise mainly includes traffic noise, industrial noise, construction noise and social noise, etc., which originate from all aspects of life, and its existence seriously affects human health. It will not only damage hearing, but also affect the central nervous system of the brain, and then affect the whole body Various organs induce various diseases and interfere with people's life and work. Therefore, it is of great significance to study new materials and methods for sound absorption and noise reduction. [0003] At present, the commonly used porous sound-absorbing materials mainly include polymer foam, ceramics, glass fiber and natural plant fiber. However, these materials usually have disadvantages such as large ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184
CPCC01B2204/20C01B32/184
Inventor 曲良体卢冰杨洪生
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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