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Porous carbon fiber and composite microwave-absorbing material based thereon and preparation method of composite microwave-absorbing material

A technology of porous carbon fiber and composite material, applied in fiber processing, textile and papermaking, filament/thread forming, etc., can solve the problems of high phenolic carbon residue rate, unfavorable wave absorption, unfavorable hole formation, etc.

Inactive Publication Date: 2011-08-31
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The literature (Carbon, 1997, 35: 1031-1033) introduced the method of preparing mesoporous carbon fibers by the blend spinning method, but it is practical to use phenolic formaldehyde as the carbon precursor and the melt spinning method is adopted, but the carbon residue rate of phenolic formaldehyde High, not conducive to the formation of holes, and the mesopore diameter is about tens of nanometers, which is too different from the wavelength of radar waves, which is not conducive to absorbing waves

Method used

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  • Porous carbon fiber and composite microwave-absorbing material based thereon and preparation method of composite microwave-absorbing material
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  • Porous carbon fiber and composite microwave-absorbing material based thereon and preparation method of composite microwave-absorbing material

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Prepare blended precursors with the ratio of polyacrylonitrile / polymethyl methacrylate mass ratio 70 / 30 and high-temperature treatment (specific method can refer to CN 101112980) to obtain porous carbon fibers, fully grind the porous carbon fibers, weigh 8g and add to In 67g of 128 type epoxy resin, stir well until it is evenly mixed, then weigh 18.5g of low molecular weight polyamine, 6g of silane coupling agent, and 0.5g of defoamer, add it to the above mixture, stir again, and use ultrasonic dispersion until mixed uniform. Pour an appropriate amount of the mixture into the mold, put the cast mold on the stage of the hot press, apply a pressure of 10 MPa, and cure it at room temperature for 6 hours, then the mold can be taken. A square plate-shaped sample with a size of 180 mm×180 mm and a thickness of 3 mm was obtained. The absorption decay curve of this sample is shown in the appendix figure 2 , the maximum absorption peak is -20.8dB, the corresponding frequency ...

Embodiment 2

[0030] Prepare blended precursors with the ratio of polyacrylonitrile / polymethyl methacrylate mass ratio 90 / 10 and high-temperature treatment (specific method can refer to CN 101112980) to obtain porous carbon fibers, fully grind the porous carbon fibers, weigh 8g and add to In 63g of 128-type epoxy resin, stir well until it is evenly mixed, then weigh 28g of low molecular weight polyamine and 1g of silane coupling agent and add it to the aforementioned mixture, stir again fully, and use ultrasonic dispersion until it is evenly mixed. Pour an appropriate amount of the mixture into the mold, put the cast mold on the stage of the hot press, apply a pressure of 10 MPa, and cure it at room temperature for 6 hours, then the mold can be taken. A square plate-shaped sample with a size of 180 mm×180 mm and a thickness of 3 mm was obtained. The maximum absorption peak of this sample is -12.3dB, the corresponding frequency is 12.3GHz, and the absorption bandwidth below -10dB is 1.6GHz. ...

Embodiment 3

[0032] Prepare blended precursors with the ratio of polyacrylonitrile / polymethyl methacrylate mass ratio 75 / 25 and high-temperature treatment (specific method can refer to CN 101112980) to obtain porous carbon fibers, fully grind the porous carbon fibers, weigh 4g and add to In 71g of 128 type epoxy resin, stir well until it is evenly mixed, then weigh 18.5g of low molecular weight polyamine, 6g of silane coupling agent, and 0.5g of defoamer, add it to the above mixture, stir again, and use ultrasonic dispersion until mixed uniform. Pour an appropriate amount of the mixture into the mold, put the cast mold on the stage of the hot press, apply a pressure of 10 MPa, and cure it at room temperature for 6 hours, then the mold can be taken. A square plate-shaped sample with a size of 180 mm×180 mm and a thickness of 3 mm was obtained. The maximum absorption peak value of this sample is -11.78dB, the corresponding frequency is 10.2GHz, and the absorption bandwidth below -10dB is 1G...

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Abstract

The invention relates to a composite microwave-absorbing material by using porous carbon fiber as an absorbent, and a preparation method thereof. The material is characterized in that: (1) in the composite material, polyacrylonitrile (PAN)-based porous carbon fiber prepared by a blend spinning-high temperature carbonization process is used as a microwave absorbing agent, epoxy resin is used as a substrate, and the microwave absorbing agent is uniformly dispersed in the substrate; (2) the preparation method of the composite material comprises the steps of: at first, adding the ground PAN-based porous carbon fiber into the epoxy resin, and mechanically stirring to uniformly mix the carbon fiber with the epoxy resin to obtain a mixture; then adding a coupling agent, a defoaming agent and a curing agent into the mixture, ultrasonically dispersing for uniformly mixing; and moulding the obtained mixed liquid and curing at room temperature to obtain the composite microwave-absorbing material. The use quantities of the materials are as bellows: on the basis of the overall weight of the composite material, the content of the porous carbon fiber absorbent is 0.5 to 10wt%, the mass ratio of the curing agent to the epoxy resin is 1: (2-4), the use quantity of the coupling agent is 0.5 to 8wt%, and the use quantity of the defoaming agent is 0 to 1wt%. The composite microwave-absorbing material is simple in preparation process and excellent in microwave absorbing performance.

Description

technical field [0001] The invention belongs to the field of preparation of wave-absorbing composite materials, in particular to a porous carbon fiber and a wave-absorbing composite material based on the porous carbon fiber and a preparation method thereof, specifically, a polyacrylonitrile (PAN)-based porous carbon fiber and a material based on the porous carbon fiber The wave-absorbing composite material of the porous carbon fiber and its preparation method. Background technique [0002] Porous carbon fibers are mostly used to make adsorption materials and carbon electrode materials because of their rich mesopore structure and high specific surface area, but their absorbing properties are less developed. In fact, the carbon material currently used as a wave absorbing agent is mainly carbon black, and there are relatively few successful cases of carbon fiber material applications. The post-long carbon fiber will show anisotropy when absorbing electromagnetic waves due to i...

Claims

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Application Information

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IPC IPC(8): D01F9/22D01D5/247C08L63/02C08K7/24C08K3/04
Inventor 李光谢天时杨胜林金俊弘张亮江建明
Owner DONGHUA UNIV
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