A carbon nanotube-aluminum nitride wave absorbing agent and its preparation method, a carbon nanotube-aluminum nitride composite wave absorbing material and its application

A technology of carbon nanotubes and aluminum nitride, which is applied in the field of wave-absorbing materials, can solve problems such as large surface energy, affecting the uniform dispersion of carbon nanotubes, and small diameters of carbon nanotubes, and achieves the effect of simple operation and suitable for industrial production

Active Publication Date: 2021-02-19
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
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Problems solved by technology

However, due to the small diameter and large surface energy of carbon nanotubes, they are easily entangled and agglomerated, which seriously affects the uniform dispersion of carbon nanotubes in polymers, resulting in the absorption performance of the absorbing material being affected to a certain extent. influences

Method used

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  • A carbon nanotube-aluminum nitride wave absorbing agent and its preparation method, a carbon nanotube-aluminum nitride composite wave absorbing material and its application
  • A carbon nanotube-aluminum nitride wave absorbing agent and its preparation method, a carbon nanotube-aluminum nitride composite wave absorbing material and its application
  • A carbon nanotube-aluminum nitride wave absorbing agent and its preparation method, a carbon nanotube-aluminum nitride composite wave absorbing material and its application

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preparation example Construction

[0044] The present invention provides the preparation method of the carbon nanotube-aluminum nitride wave absorbing agent described in the above technical scheme, comprising the following steps:

[0045] The carbon nanotube, aluminum nitride and anhydrous dispersant are mixed and modified to obtain the carbon nanotube-aluminum nitride wave absorbing agent.

[0046] In the present invention, the anhydrous dispersant preferably includes N,N-dimethylformamide or absolute ethanol, more preferably N,N-dimethylformamide. In the present invention, the aluminum nitride is easily hydrolyzed with water, and the present invention uses an anhydrous dispersant as an anhydrous dispersant, which can avoid side reactions of aluminum nitride, thereby improving the absorption of carbon nanotubes-aluminum nitride. The absorbing performance of the agent. In the present invention, the ratio of the mass of the carbon nanotubes to the volume of the anhydrous dispersant is preferably 1 g: (2-4) L, m...

Embodiment 1

[0065] Add 300mL of DMF to a beaker with a capacity of 500mL, add 20mg of multi-walled carbon nanotubes (MWCNTs, mostly 5-8μm in length, 30-35nm in diameter, and about 0.06nm in wall thickness) and 0.98g of aluminum nitride, Place the beaker in an ultrasonic machine for ultrasonic dispersion for 1 hour to obtain a mixed solution; transfer the mixed solution to a round-bottomed flask, put a magnet, add a condenser tube to one side of the round-bottomed flask, and fix the experimental device in an oil bath The modification process was started in the middle, and under the condition of magnetic stirring, the temperature was raised to 130° C. at a heating rate of 3.5° C. / min, and then the modification reaction was performed for 9 hours. After the reaction, the whole experimental device was naturally cooled to room temperature, and then the round bottom flask was taken out; the obtained wave absorbing agent solution was suction filtered to obtain a solid; the solid was washed with ab...

Embodiment 2

[0067] Add 300mL of DMF to a beaker with a capacity of 500mL, add 100mg of multi-walled carbon nanotubes (mostly 5-8μm in length, 30-35nm in diameter, and about 0.06nm in wall thickness) and 1.9g of aluminum nitride in the beaker. Place in an ultrasonic machine for ultrasonic dispersion for 1.5 hours to obtain a mixed solution; transfer the mixed solution to a round-bottomed flask, put a magnet, add a condenser tube to one side of the round-bottomed flask, and fix the experimental device in an oil bath The oil bath experiment was started, and under the condition of magnetic stirring, the temperature was raised to 120° C. at a heating rate of 3.5° C. / min and then reacted for 8 hours. After the reaction, the whole experimental device was naturally cooled to room temperature, and then the round bottom flask was taken out; the obtained wave absorbing agent solution was suction filtered to obtain a solid; the solid was washed with absolute ethanol and ultrapure water in sequence, an...

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Abstract

The invention provides a carbon nanotube-aluminum nitride wave absorbing agent and a preparation method thereof, a carbon nanotube-aluminum nitride composite wave-absorbing material and applications thereof, belonging to the technical field of wave-absorbing materials. The carbon nanotube-aluminum nitride wave absorbing agent provided by the present invention includes carbon nanotubes and aluminum nitride; the aluminum nitride is coated on the surface of the carbon nanotubes; the length of the carbon nanotubes is 2-10 μm; The mass of the carbon nanotube accounts for 1-10% of the total mass of the carbon nanotube-aluminum nitride wave absorbing agent. The aluminum nitride used in the present invention has good thermal shock resistance, dielectric properties and corrosion resistance of molten metal; carbon nanotubes have excellent characteristics such as large specific surface area, high aspect ratio, excellent mechanical strength, and outstanding dielectric properties. The functional groups or chemical bonds on the surface of carbon nanotubes are substituted or combined with the chemical bonds in aluminum nitride, which improves the dispersibility of carbon nanotubes in carbon nanotube-aluminum nitride wave absorbing agent, carbon nanotube-aluminum nitride absorbing agent The wave agent has excellent wave-absorbing properties.

Description

technical field [0001] The invention relates to the technical field of wave-absorbing materials, in particular to a carbon nanotube-aluminum nitride wave-absorbing agent and a preparation method thereof, a carbon nanotube-aluminum nitride composite wave-absorbing material and applications thereof. Background technique [0002] With the rapid development of modern science and technology and the development of electronic information technology in the civilian field, the derived electromagnetic radiation has caused many complex problems such as electromagnetic pollution, electromagnetic interference, information leakage, etc., hindering the development of information industry, electronics industry and other fields; For national defense construction, especially microwave electronic technology and advanced radar, as an effective means to improve the survival, penetration and depth capabilities of weapon systems, has become one of the hotspots in the world's military powers competi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/00C01B32/168
CPCC09K3/00C01B32/168
Inventor 王廷梅马巍王齐华
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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