Preparation method of chitosan modification barium ferrite filling multi-walled carbon nanotube/poly 3-methylthiophene composite wave-absorbing material

Abstract

The invention provides a preparation method of a chitosan modification barium ferrite filling multi-walled carbon nanotube / poly 3-methylthiophene composite wave-absorbing material. The method utilizes a carbon nanotube as a raw material, after the carbon nanotube is filled with barium ferrite, chitosan is coated on the carbon nanotube for modification, and then the carbon nanotube is composited with poly 3-methylthiophene to obtain the novel wave-absorbing material integrating magnetic loss, electrical loss and carbon nanotube wave absorption. Requirements for being thin, light, wide and strong of the wave-absorbing material are met. Therefore, the composite wave-absorbing material has wide application prospect in aspects of microwave absorption, electromagnetic radiation resistance and the like.

Description

technical field

[0001] The invention belongs to the field of preparation of electromagnetic wave absorbing materials, in particular to a chitosan-modified barium ferrite-filled multi-walled carbon nanotube / poly-3-methylthiophene which integrates conduction loss, magnetic loss and carbon nanotube wave absorption Preparation method of composite wave-absorbing material. Background technique

[0002] Electromagnetic Wave Absorbing Materials (Electromagnetic Wave Absorbing Materials) refer to a class of materials that can absorb and attenuate incident electromagnetic waves, convert electromagnetic energy into thermal energy and dissipate it, or make electromagnetic waves disappear due to interference. In a broad sense, it includes anti-electromagnetic interference (EMI) and microwave absorbing materials (RAM), and even includes a wide range of materials from acoustic waves to infrared absorbing materials, and its application range is still expanding. In terms of loss mechanism, ...

Examples

Embodiment 1

[0018] (1) Preparation of multi-walled carbon nanotubes filled with barium ferrite

[0019] At room temperature, put 1.0 g of multi-walled carbon nanotubes into an Erlenmeyer flask, add 40 mL of saturated ferric nitrate solution and 20 mL of saturated barium nitrate solution, and add 15 mL of concentrated nitric acid and Concentrated sulfuric acid 5mL, after ultrasonic dispersion is uniform, interact for 10 days, filter, vacuum dry, put in a quartz boat, put into a tube atmosphere furnace, pass in nitrogen, the gas flow rate is 2 liters / min, and the heating rate is 3°C / Minutes, the temperature was raised to 700°C, kept for 2 hours, cooled naturally to room temperature, washed with deionized water until the pH was about 7, filtered again, and vacuum-dried to obtain multi-walled carbon nanotubes filled with barium ferrite.

[0020] (2) Preparation of chitosan-modified barium ferrite filled multi-walled carbon nanotubes

[0021] Dissolve 1.0g of chitosan in dilute acetic aci...

Embodiment 2

[0027] The preparation of barium ferrite-filled multi-walled carbon nanotubes, the preparation of chitosan-modified barium ferrite-filled multi-walled carbon nanotubes, and the preparation of poly-3-methylthiophene were the same as in Example 1, and 1.0 g of chitosan-modified The multi-walled carbon nanotubes filled with barium ferrite were mixed with 3.0g poly-3-methylthiophene and ground thoroughly to obtain the chitosan-modified barium ferrite-filled multi-walled carbon nanotubes / poly-3-methylthiophene composite adsorbent Wave material, the frequency band width of its absorption peak greater than -28dB can reach 35%, and the highest absorption peak can reach -40dB.

Embodiment 3

[0029] Preparation of barium ferrite-filled multi-walled carbon nanotubes, preparation of chitosan-modified barium ferrite-filled multi-walled carbon nanotubes, preparation of poly-3-methylthiophene Example 1, take 1.2g chitosan-modified The multi-walled carbon nanotubes filled with barium ferrite were mixed with 2.8g poly-3-methylthiophene, and ground thoroughly to obtain the multi-walled carbon nanotubes / poly-3-methylthiophene composite adsorbed with chitosan-modified barium ferrite. For wave materials, the frequency bandwidth with absorption peak greater than -30dB can reach 30%, and the highest absorption peak can reach -38dB.

technical field

[0001] The invention belongs to the field of preparation of electromagnetic wave absorbing materials, in particular to a chitosan-modified barium ferrite-filled multi-walled carbon nanotube / poly-3-methylthiophene which integrates conduction loss, magnetic loss and carbon nanotube wave absorption Preparation method of composite wave-absorbing material. Background technique

[0002] Electromagnetic Wave Absorbing Materials (Electromagnetic Wave Absorbing Materials) refer to a class of materials that can absorb and attenuate incident electromagnetic waves, convert electromagnetic energy into thermal energy and dissipate it, or make electromagnetic waves disappear due to interference. In a broad sense, it includes anti-electromagnetic interference (EMI) and microwave absorbing materials (RAM), and even includes a wide range of materials from acoustic waves to infrared absorbing materials, and its application range is still expanding. In terms of loss mechanism, ...

Examples

Embodiment 1

[0018] (1) Preparation of multi-walled carbon nanotubes filled with barium ferrite

[0019] At room temperature, put 1.0 g of multi-walled carbon nanotubes into an Erlenmeyer flask, add 40 mL of saturated ferric nitrate solution and 20 mL of saturated barium nitrate solution, and add 15 mL of concentrated nitric acid and Concentrated sulfuric acid 5mL, after ultrasonic dispersion is uniform, interact for 10 days, filter, vacuum dry, put in a quartz boat, put into a tube atmosphere furnace, pass in nitrogen, the gas flow rate is 2 liters / min, and the heating rate is 3°C / Minutes, the temperature was raised to 700°C, kept for 2 hours, cooled naturally to room temperature, washed with deionized water until the pH was about 7, filtered again, and vacuum-dried to obtain multi-walled carbon nanotubes filled with barium ferrite.

[0020] (2) Preparation of chitosan-modified barium ferrite filled multi-walled carbon nanotubes

[0021] Dissolve 1.0g of chitosan in dilute acetic aci...

Embodiment 2

[0027] The preparation of barium ferrite-filled multi-walled carbon nanotubes, the preparation of chitosan-modified barium ferrite-filled multi-walled carbon nanotubes, and the preparation of poly-3-methylthiophene were the same as in Example 1, and 1.0 g of chitosan-modified The multi-walled carbon nanotubes filled with barium ferrite were mixed with 3.0g poly-3-methylthiophene and ground thoroughly to obtain the chitosan-modified barium ferrite-filled multi-walled carbon nanotubes / poly-3-methylthiophene composite adsorbent Wave material, the frequency band width of its absorption peak greater than -28dB can reach 35%, and the highest absorption peak can reach -40dB.

Embodiment 3

[0029] Preparation of barium ferrite-filled multi-walled carbon nanotubes, preparation of chitosan-modified barium ferrite-filled multi-walled carbon nanotubes, preparation of poly-3-methylthiophene Example 1, take 1.2g chitosan-modified The multi-walled carbon nanotubes filled with barium ferrite were mixed with 2.8g poly-3-methylthiophene, and ground thoroughly to obtain the multi-walled carbon nanotubes / poly-3-methylthiophene composite adsorbed with chitosan-modified barium ferrite. For wave materials, the frequency bandwidth with absorption peak greater than -30dB can reach 30%, and the highest absorption peak can reach -38dB.