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Method for preparing modified carbon nanotube and ferrite and polyimide composite absorbing material

A composite wave absorbing material, carbon nanotube technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of high thermal expansion coefficient, low thermal conductivity, net charge accumulation, etc., to achieve the effect of improving mechanical properties

Inactive Publication Date: 2012-01-25
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, due to the high thermal expansion coefficient, low thermal conductivity and good insulation of polyimide film itself, the net charge accumulation has limited its wider application in the aerospace field.

Method used

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  • Method for preparing modified carbon nanotube and ferrite and polyimide composite absorbing material
  • Method for preparing modified carbon nanotube and ferrite and polyimide composite absorbing material
  • Method for preparing modified carbon nanotube and ferrite and polyimide composite absorbing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024]At a temperature of 25°C, take 1g of multi-walled carbon nanotubes with an average length of 0.85-1.5μm and a diameter of 10-50nm and put them into a plasma discharge device, introduce argon gas, discharge voltage at 50V, and discharge current at 0.2A. The time was 5min; 1g of plasma-modified carbon nanotubes was mixed with 50ml of deionized water in a three-necked flask and stirred evenly, and 4.04g of Fe(NO 3 ) 3 9H 2 O, 0.73gCo(NO 3 ) 2 ·6H 2 O, 0.73gNi(NO 3 ) 2 ·6H 2 O nitrate was added to the carbon nanotube aqueous solution, and after fully stirring for 2.5-3 hours, 0.0059 g / ml KOH solution was slowly dropped into the solution until the pH value of the solution was 9-10. After stirring at a temperature of 25°C for 23-24h, filter the filter cake with ultrafiltration membrane and wash the filter cake with deionized water until it is neutral, dry it at a temperature of 60°C for 1.5h and grind it, and the powder after grinding reaches the micron level. Under a ...

Embodiment 2

[0026] At a temperature of 25°C, take 1g of multi-walled carbon nanotubes with an average length of 0.85-1.5μm and a diameter of 10-50nm and put them into a plasma discharge device, introduce argon gas, discharge voltage at 60V, and discharge current at 0.25A. The time is 7min; 1g of plasma-modified carbon nanotubes is mixed with 50ml of deionized water in a three-necked flask and stirred evenly, and 12.12g of Fe(NO 3 ) 3 9H 2 O, 2.18g Co(NO 3 ) 2 ·6H 2 O, 2.18gNi(NO 3 ) 2 ·6H 2 O nitrate is added in the aqueous solution of carbon nanotubes, and then the experimental method is the same as that of Example 1 to obtain the modified carbon nanotubes / Co 0.5 Ni 0.5 Fe 2 o 4 Composite powder; 2g modified carbon nanotubes / Co 0.5 Ni 0.5 Fe 2 o 4 The ferrite composite powder was added in 42.5g dimethylacetamide (DMAc), and then the experimental method was the same as in Example 1 to finally obtain carbon nanotubes / Co 0.5 Ni 0.5 Fe 2 o 4 / Polyimide composite absorbing m...

Embodiment 3

[0028] At a temperature of 25°C, take 1g of multi-walled carbon nanotubes with an average length of 0.85-1.5μm and a diameter of 10-50nm and put them into a plasma discharge device, introduce argon gas, discharge voltage at 70V, and discharge current at 0.3A. The time is 10min; 1g of plasma-modified carbon nanotubes is mixed with 50ml of deionized water and stirred evenly, and 20.2g of Fe(NO 3 ) 3 9H 2 O, 3.63gCo(NO 3 ) 2 ·6H 2 O, 3.63gNi(NO 3 ) 2 ·6H 2 O nitrate is added in the aqueous solution of carbon nanotubes, and then the experimental method is the same as that of Example 1 to obtain the modified carbon nanotubes / Co 0.5 Ni 0.5 Fe 2 o 4 Composite powder; 3g modified carbon nanotubes / Co 05 Ni 05 Fe 2 o 4 The ferrite composite powder was added in 46.1g dimethylacetamide (DMAc), and then the experimental method was the same as in Example 1 to finally obtain carbon nanotubes / Co 05 Ni 05 Fe 2 o 4 / 10.93g of polyimide composite wave-absorbing material, and t...

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Abstract

The invention discloses a method for preparing a modified carbon nanotube and ferrite and polyimide composite absorbing material. The method comprises the following steps of: modifying carbon nanotubes by using argon plamas, and preparing the modified carbon nanotubes and ferrite into composite powder by using a chemical coprecipitation method; and preparing the composite powder, 4,4-dioctyldiphenylamine and pyromellitic dianhydride into the modified carbon nanotube / ferrite / polyimide composite absorbing material by using an in situ polymerization method. The method has the advantages that: onthe premise of not influencing good heat resistance of polyimide, the mechanical properties of the composite material are improved, and the light and high-frequency absorbing material is prepared. Bythe method for preparing the modified carbon nanotube and ferrite and polyimide composite absorbing material, the mechanical properties of the composite material are improved, and the prepared composite material with wave-absorbing performance can be widely applied to the field of aerospace.

Description

technical field [0001] The invention relates to a preparation method of a modified carbon nanotube, ferrite and polyimide composite wave-absorbing material, which belongs to the preparation technology of the nano-composite wave-absorbing material. Background technique [0002] The unique mechanical, electrical and magnetic properties of carbon nanotubes indicate that it has broad application prospects in the preparation of microwave-absorbing stealth materials. However, its high surface energy, easy agglomeration and difficulty in combining with the matrix limit its application. [0003] Among the surface modification methods of carbon nanotubes, such as oxidation, amination, and halogenation, the in-situ modification of polymers has attracted special attention. However, there are initiators in most of them, which affect the performance of composite materials. [0004] Low-temperature argon plasma modification of carbon nanotubes can improve surface properties such as wett...

Claims

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Application Information

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IPC IPC(8): C08G73/10C08K13/06C08K9/00C08K7/00C08K3/04C08K3/22C09K3/00
Inventor 李家俊张磊师春生刘恩佐何春年赵乃勤
Owner TIANJIN UNIV
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