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Absorbing paper and its preparation method and application

A wave-absorbing agent and wave-absorbing material technology, which is applied in the field of papermaking, can solve problems such as unfavorable impedance matching characteristics, absorber peeling, difficult gradient control of electromagnetic parameters, etc.

Active Publication Date: 2018-01-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, traditional wave-absorbing sandwich materials, such as honeycomb sandwich materials, are mainly prepared by impregnating the glue mixed with wave-absorbing agent with paper honeycomb as the matrix. In glue, when the glue contains absorbing agent, it is often difficult to achieve uniform impregnation, so it is difficult to achieve gradient control of electromagnetic parameters, which is not conducive to the optimization of impedance matching characteristics, so the broadband absorbing effect is not ideal
In addition, the absorbing sandwich material prepared by this method is prone to peeling off of the absorber under long-term use, pollutes the surrounding electromagnetic environment, and affects the stability of its absorbing performance.

Method used

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  • Absorbing paper and its preparation method and application
  • Absorbing paper and its preparation method and application
  • Absorbing paper and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Mix 5wt% of carbon fiber and 95wt% of para-aramid fibrillated pulp to prepare slurry A1, mix 10wt% of carbon fiber and 90wt% of para-aramid fibrillated pulp to prepare slurry A2, and mix 15wt% of carbon fiber Mixed with para-aramid fiber fibrillated pulp 85wt% to prepare slurry A3, and slurry A1, A2, A3 were respectively formed by filtration to obtain wave-absorbing paper A1', A2', A3'. The fibrous wave-absorbing agent is carbon fiber (domestic), with a diameter of 10 μm and a length of 8 mm, and the wave-transmitting fiber is para-aramid fibrillated pulp.

[0075] like figure 1 In the preparation process shown, the above-mentioned carbon fiber is dispersed in water with a disintegrator, and the above-mentioned para-aramid fibrillated pulp is dispersed in water with a pulper to obtain two uniformly dispersed suspensions, and then the two suspensions are The liquid was mixed and stirred evenly to obtain a slurry with a concentration of 0.03%. Slurries A1, A2, and A3 we...

Embodiment 2

[0083] Mix 40wt% of silicon carbide fiber and 60wt% of para-aramid precipitated pulp to prepare slurry A1, mix 50wt% of silicon carbide fiber and 50wt% of para-aramid precipitated pulp to prepare slurry A2, and carbonize 60wt% of silicon fiber and 40wt% of para-aramid precipitated pulp were mixed to prepare slurry A3, and slurry A1, A2, and A3 were respectively formed by filtration to prepare wave-absorbing papers A1', A2', and A3'. The fiber absorbing agent is silicon carbide fiber (domestic), with a diameter of 12 μm and a length of 6 mm, and the wave-transmitting fiber is para-aramid precipitated pulp.

[0084] like figure 1 In the preparation process shown, the above-mentioned silicon carbide fiber is dispersed in water with a disintegrator, and the above-mentioned para-aramid precipitated pulp is dispersed in water with a pulper to obtain two uniformly dispersed suspensions, and then the two The suspensions were mixed and stirred evenly to obtain a slurry with a concentr...

Embodiment 3

[0087] Mix polycrystalline iron fiber 35wt%, carbon black 5wt% and PBO fibrillated pulp 60wt% to prepare slurry A1, polycrystalline iron fiber 37.5, carbon black 6wt%wt% and PBO fibrillated pulp 56.5wt % mixed to obtain slurry A2, 40wt% of polycrystalline iron fiber, 7wt% of carbon black and 53wt% of PBO fibrillated pulp were mixed to obtain slurry A3, and slurry A1, A2, and A3 were respectively filtered and formed to obtain Absorbing paper A1', A2', A3'. The fibrous wave-absorbing agent is polycrystalline iron fiber with a diameter of 5 μm and a length of 1 mm. The granular wave-absorbing agent is carbon black with a particle size of 5-10 μm. The wave-transmitting fiber is PBO fibrillated pulp.

[0088] like figure 1 In the preparation process shown, the above-mentioned polycrystalline iron fiber and carbon black are dispersed in water with a disintegrator, and the above-mentioned PBO fibrillation pulp is dispersed in water with a pulper to obtain three uniformly dispersed s...

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Abstract

The invention provides wave-absorbing paper and a preparation method and application thereof. The wave absorbing paper contains 0.1-95 wt% of a fiber wave-absorbing agent and 5-99.9 wt% of wave-transparent fiber. The fiber wave-absorbing agent and wave-transparent fiber are mixed and prepared into the wave-absorbing paper by a papermaking process; and then the wave-absorbing paper as a lattice wall material is prepared into a wave-absorbing core sandwich; and then the wave-absorbing core sandwiches prepared from wave-absorbing paper with different fiber wave-absorbing agent content are separated by wave-permeable layers; and finally the entire structure is impregnated and cured to obtain the wave-absorbing material. The wave-absorbing material of the invention has the advantages of high wave-absorbing efficiency, stable wave-absorbing property, wide absorption band, and light weight and high strength.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to a wave-absorbing paper with a wave-absorbing function and a preparation method and application thereof. Background technique [0002] As high-frequency electromagnetic radiation is more and more widely used in the field of radar and communication, people pay more and more attention to electromagnetic shielding, and the requirements for absorbing materials are also getting higher and higher. Generally, the comprehensive requirements for absorbing materials are high absorption efficiency, wide absorption frequency band, light weight and high strength. How to prepare a microwave-absorbing material that simultaneously fulfills the above requirements has always been the research goal of researchers in this field. [0003] According to the application form, the absorbing materials can be divided into two categories: parasitic absorbing materials and structural absorbing materials,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H13/20D21H13/48D21H13/36D21H13/10D21H27/30B32B29/00
Inventor 胡健王宜孙耀
Owner SOUTH CHINA UNIV OF TECH
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