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Preparation method of polyaniline/carbon foam composite material with controllable absorbing properties

A technology of composite materials and microwave-absorbing performance, which is applied in the field of preparation of microwave-absorbing materials, can solve problems such as low microwave-absorbing strength and complicated preparation methods, achieve light-weight microwave-absorbing performance, improve dielectric loss capability, and reduce surface resistance. Effect

Active Publication Date: 2022-02-18
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, when carbon foam is used in the field of microwave-absorbing material preparation, there are disadvantages of complicated preparation methods and low absorbing strength.

Method used

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  • Preparation method of polyaniline/carbon foam composite material with controllable absorbing properties
  • Preparation method of polyaniline/carbon foam composite material with controllable absorbing properties
  • Preparation method of polyaniline/carbon foam composite material with controllable absorbing properties

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preparation example Construction

[0028] A kind of preparation method of the polyaniline / carbon foam composite material with controllable wave-absorbing performance that the present invention proposes, concrete steps are as follows:

[0029] (1) Preparation of carbon foam: calcining clean melamine foam in a resistance furnace: calcining at a constant temperature of 500-950° C. for 1-5 hours, then gradually cooling to room temperature. The whole process was carried out under nitrogen protection. After the foam is cooled to room temperature, take it out and soak it in concentrated sulfuric acid for 1-50 minutes, then wash it repeatedly with deionized water until neutral, and dry it in a vacuum oven at 20-50°C for 1-12 hours;

[0030] (2) Preparation of dispersion A: Weigh 0.01mol-0.8mol of protonic acid, add 0.02-0.1mol of oxidizing agent into 50-360ml water; under 500W power, ultrasonically disperse for 10-45min, so that protonic acid and oxidizing agent are fully dispersed in water, The protonic acid used is ...

Embodiment 1

[0035] This embodiment is a preparation method of a polyaniline / carbon foam composite material with controllable wave-absorbing performance, which is carried out according to the following steps:

[0036] (1) Preparation of carbon foam: calcining clean melamine foam in a resistance furnace: calcining at a constant temperature of 950° C. for 2.5 hours, then gradually cooling to room temperature. The whole process was carried out under nitrogen protection. After the foam is cooled to room temperature, take it out and soak it in concentrated sulfuric acid for 15 minutes, then wash it repeatedly with deionized water until neutral, and dry it in a vacuum oven at 50°C for 12 hours;

[0037] (2) Preparation of dispersion liquid A: weigh 0.02 mol of p-toluenesulfonic acid, add 0.02 mol of ammonium persulfate into 360 ml of water; under 500W power, ultrasonically disperse for 45 minutes, so that the protonic acid and oxidant are fully dispersed in the water;

[0038] (3) Preparation o...

Embodiment 2

[0044] This embodiment is a preparation method of a polyaniline / carbon foam composite material with controllable wave-absorbing performance, which is carried out according to the following steps:

[0045] (1) Preparation of carbon foam: calcining clean melamine foam in a resistance furnace: calcining at a constant temperature of 950° C. for 2.5 hours, then gradually cooling to room temperature. The whole process was carried out under nitrogen protection. After the foam is cooled to room temperature, take it out and soak it in concentrated sulfuric acid for 15 minutes, then wash it repeatedly with deionized water until neutral, and dry it in a vacuum oven at 50°C for 12 hours;

[0046] (2) Preparation of dispersion A: Weigh 0.3 mol of hydrochloric acid, add 0.02 mol of ammonium persulfate into 360 ml of water; under 500W power, ultrasonically disperse for 45 minutes, so that protonic acid and oxidant are fully dispersed in water;

[0047] (3) Preparation of dispersion B: ultra...

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Abstract

The invention relates to a preparation method of a polyaniline / carbon foam composite material with controllable wave-absorbing performance. The melamine foam is calcined, soaked in concentrated sulfuric acid, and dried to obtain a carbon foam; the protonic acid and an oxidant are dispersed in water to obtain a dispersion A ; Disperse aniline in water to obtain aniline dispersion, and then disperse in an ice-water mixture to obtain dispersion B; put carbon foam into dispersion A after fully absorbing dispersion B, stir under ice / water mixture, and filter out the foam , after pre-freezing treatment and then vacuum freeze-drying, the polyaniline / carbon foam composite material was prepared. Compared with the prior art, the present invention has very superior wave-absorbing strength and wide wave-absorbing bandwidth, and it has good elasticity and can adjust its wave-absorbing performance by deforming the composite foam by external force.

Description

technical field [0001] The invention relates to a preparation method of a wave-absorbing material, in particular to a preparation method of a polyaniline / carbon foam composite material with controllable wave-absorbing performance. Background technique [0002] Carbon foam has a specific pore structure, most of which are connected to each other, and this special structure makes it have excellent properties such as large specific surface area, light weight, good thermal stability, high thermal conductivity and electrical conductivity. In addition, the performance of carbon foam is not only determined by the size of the pore structure, but also affected by the properties of the composites contained in it, so it has wider applications than other forms of carbon materials. At present, when carbon foam is used in the field of microwave-absorbing material preparation, there are disadvantages of complicated preparation methods and low absorbing strength. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L79/02C08K7/24C08G73/02
CPCC08K7/24C08G73/0266
Inventor 邱军施煜楠
Owner TONGJI UNIV
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