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Wave-absorbing material as well as preparation method and application thereof

A technology of wave absorbing materials and oxides, applied in the field of wave absorbing materials, can solve the problems of pollution and complex synthesis process, and achieve the effect of simple process, abundant raw material sources, and high-value utilization.

Active Publication Date: 2022-05-10
AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the synthesis of these carbon materials mainly comes from petrochemical resources, and the synthesis process is complicated and polluted.

Method used

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  • Wave-absorbing material as well as preparation method and application thereof
  • Wave-absorbing material as well as preparation method and application thereof
  • Wave-absorbing material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Step 1: Cut 10.0 grams of kapok fibers into short fibers about 0.1 mm long, add them to 400 mL of sodium chlorite aqueous solution with a concentration of 0.00125 g / mL, stir for 0.5 h at 30 °C and 200 r / min, and filter to obtain The solid substance was added to 400mL of chloroacetic acid aqueous solution with a concentration of 0.0025g / mL, stirred at 30°C and 200r / min for 0.5h, the solid substance was filtered, washed with water until neutral, and dried with air at 50°C to obtain pro- Water-based kapok fiber;

[0049] Step 2, the hydrophilic kapok fiber that step 1 is made, joins in the mixed aqueous solution of 400mL cerium nitrate hexahydrate and ferric nitrate nonahydrate (in the solution, the concentration of cerium nitrate hexahydrate, ferric nitrate nonahydrate is respectively 0.00125g / mL), stirred at 30°C and 200r / min for 0.5h, then adjusted the pH value to 9 with ammonia water, transferred to a 500mL polytetrafluoroethylene-lined autoclave for hydrothermal reac...

Embodiment 2

[0055] Step 1: Cut 10.0 grams of kapok fibers into short fibers about 3 mm long, add them to 400 mL of sodium chlorite aqueous solution with a concentration of 0.0075 g / mL, stir for 2 hours at 60 °C and 600 r / min, and filter the obtained Add the solid substance to 400mL of chloroacetic acid aqueous solution with a concentration of 0.00625g / mL, stir at 60°C and 600r / min for 2h, filter the solid substance, wash it with water until neutral, and dry it with air at 80°C to obtain a hydrophilic kapok fiber;

[0056] Step 2, the hydrophilic kapok fiber that step 1 makes is joined in the mixed aqueous solution of 400mL cerium nitrate hexahydrate and ferric nitrate nonahydrate (the concentration of cerium nitrate hexahydrate in the solution is 0.015775g / mL, ferric nitrate nonahydrate The concentration is 0.0109g / mL), stirred at 60°C and 600r / min for 2h, then adjusted the pH value to 10 with ammonia water, transferred to a 500mL polytetrafluoroethylene-lined autoclave for hydrothermal r...

Embodiment 3

[0062] Step 1: Cut 10.0 grams of kapok fibers into short fibers about 10 mm long, add them to 400 mL of sodium chlorite aqueous solution with a concentration of 0.125 g / mL, stir at 90 °C and 1200 r / min for 12 hours, and filter the obtained Add the solid substance to 400mL of chloroacetic acid aqueous solution with a concentration of 0.25g / mL, stir at 90°C and 1200r / min for 12h, filter the solid substance, wash it with water until neutral, and dry it with air at 120°C to obtain a hydrophilic kapok fiber;

[0063] Step 2, the hydrophilic kapok fiber that step 1 is made, joins in the mixed aqueous solution of 400mL cerium nitrate hexahydrate and ferric nitrate nonahydrate (in the solution, the concentration of cerium nitrate hexahydrate, ferric nitrate nonahydrate is respectively 0.375g / mL), stirred at 90°C and 1200r / min for 12h, then adjusted the pH value to 12 with ammonia water, transferred to a 500mL polytetrafluoroethylene-lined autoclave for hydrothermal reaction at 240°C ...

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Abstract

The invention discloses a wave-absorbing material as well as a preparation method and application thereof, and relates to the technical field of wave-absorbing materials. The wave-absorbing material provided by the invention comprises hollow biomass carbon microtubes, rare earth metal oxides and iron-based metal oxides, the rare earth metal oxide and the iron metal oxide are loaded on the inner surface and the outer surface of the hollow biomass carbon microtube. According to the prepared wave-absorbing material, the lanthanide series metal oxide and the iron series metal oxide co-grow on the inner surface and the outer surface of the carbon microtube in situ, so that more heterogeneous interfaces, polarization centers and reflection / scattering surfaces can be formed on the micro-nano scale; the wave-absorbing material can attenuate electromagnetic waves through mechanisms such as conduction loss, electron polarization, interface polarization, magnetic domain resonance, natural resonance, multiple reflection / scattering and the like, so that the wave-absorbing characteristic of the wave-absorbing material is improved, and the absorption bandwidth is widened.

Description

technical field [0001] The invention relates to the technical field of wave-absorbing materials, in particular to a wave-absorbing material and its preparation method and application. Background technique [0002] With the rapid development of modern science and technology, equipment such as mobile communications, intelligent robots, 5G base stations, satellite navigation, electronic radar, and stealth equipment are widely used in national defense equipment and daily life, bringing convenience to people, but also causing electromagnetic pollution . For example, electromagnetic interference will affect the normal operation of electronic equipment, and electromagnetic radiation will cause harm to human health. Therefore, it is extremely urgent to use absorbing materials that can attenuate electromagnetic waves to reduce or eliminate this electromagnetic pollution. Traditional microwave-absorbing materials (such as ferrite, ceramics, etc.) still have disadvantages such as high...

Claims

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Application Information

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IPC IPC(8): H01Q17/00
CPCH01Q17/00
Inventor 赵鹏飞王蕊龙爱春崔海鹏陶金龙廖禄生张吉振孔娜罗梓蓉丁宏达彭政
Owner AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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