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Method using organic matter high-temperature carbonization to prepare carbon-based wave-absorbing material

A high-temperature carbonization and wave-absorbing material technology, applied in the field of wave-absorbing materials, can solve problems such as poor wave-absorbing effect, complicated preparation process, and high cost, and achieve the effects of low price, good repeatability, and strong absorption capacity

Active Publication Date: 2017-08-29
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the problems of high density, thick coating, high cost, complicated preparation process and poor absorbing effect of powder absorbing materials in the prior art

Method used

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  • Method using organic matter high-temperature carbonization to prepare carbon-based wave-absorbing material
  • Method using organic matter high-temperature carbonization to prepare carbon-based wave-absorbing material
  • Method using organic matter high-temperature carbonization to prepare carbon-based wave-absorbing material

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Example 1: Using the product of the hydrothermal reaction of sugar as a precursor, the specific steps for obtaining a carbon-based wave-absorbing material after high-temperature carbonization in a protective atmosphere are as follows:

[0028] (1) Hydrothermal carbonization of sugar: Prepare a solution of sucrose and deionized water at a molar ratio of 1:100, stir evenly and pour it into a polytetrafluoroethylene lining, put the lining into a stainless steel reaction kettle, place Reaction in a muffle furnace, the reaction temperature is 180°C, and the reaction time is 12 hours, so that the sugar can be fully converted into precursors through organic reactions such as dehydration and polycondensation;

[0029] (2) High-temperature carbonization of precursors: Take an appropriate amount of precursors in a corundum crucible, cover the crucible, and put it into a furnace for high-temperature carbonization treatment. The carbonization temperature is 800°C, the carbonization ...

Embodiment 2

[0034] Using the product of sugar hydrothermal reaction as a precursor, under a protective atmosphere, the specific steps of a carbon-based absorbing material prepared by carbonizing organic matter at a high temperature are as follows:

[0035] (1) Hydrothermal carbonization of sugar: Glucose and deionized water are prepared into a solution at a molar ratio of 1:50, stirred evenly and poured into a polytetrafluoroethylene lining, and the lining is put into a stainless steel reaction kettle, placed in Reaction in a muffle furnace, the reaction temperature is 160°C, and the reaction time is 20 hours, so that the sugar can be fully converted into precursors through organic reactions such as dehydration and polycondensation;

[0036] (2) High-temperature carbonization of precursors: Take an appropriate amount of precursors in a corundum crucible, cover the crucible, and put it into a furnace for high-temperature carbonization. The carbonization temperature is 700°C, the carbonizati...

Embodiment 3

[0041] Using the product of sugar hydrothermal reaction as a precursor, under a protective atmosphere, the specific steps of a carbon-based absorbing material prepared by carbonizing organic matter at a high temperature are as follows:

[0042] (1) Hydrothermal carbonization of sugar: prepare a solution of fructose and deionized water at a molar ratio of 1:250, stir evenly and pour it into a polytetrafluoroethylene lining, put the lining into a stainless steel reaction kettle, place Reaction in a muffle furnace, the reaction temperature is 200°C, and the reaction time is 6 hours, so that the sugar can be fully converted into precursors through organic reactions such as dehydration and polycondensation;

[0043] (2) High-temperature carbonization of precursors: Take an appropriate amount of precursors in a corundum crucible, cover the crucible, and put it into a furnace for high-temperature carbonization. The carbonization temperature is 900°C, the carbonization time is 60min, a...

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Abstract

The invention discloses a method using organic matter high-temperature carbonization to prepare a carbon-based wave-absorbing material. The method includes: using a sugar hydrothermal carbonization product as the precursor, performing high-temperature carbonization, evenly mixing the product after the high-temperature carbonization with paraffin in acetone, for dispersing and curing molding. The method has the advantages that the method is cheap and rich in raw material resources, the preparation process is good in repeatability, energy-saving and environmentally friendly, the prepared carbon-based wave-absorbing material is low in density and is better than a traditional metal-based wave-absorbing material, the carbon-based wave-absorbing material has excellent wave-absorbing performance in electromagnetic wave X wave band, is high in absorbing ability, wide in absorbable effective bandwidth range and low in minimum thickness satisfying effective loss (-10dB) and meets the thinness, lightness, width and strength requirements of the novel wave-absorbing material, and the prepared wave-absorbing material has many surface-layer pores, can provide channels for being compounded with other materials, can be used as the base material of a compound wave-absorbing material and is wide in application range.

Description

technical field [0001] The invention belongs to the technical field of wave-absorbing materials, in particular to a preparation method of carbon-based wave-absorbing materials. Background technique [0002] With the rapid development of electronic information technology, electromagnetic waves, as the carrier of information transmission, have penetrated into all aspects of human life. Regardless of military or civilian use, the generation, transmission, reception, and processing of information depend on electromagnetic waves as carriers. At the same time, the wide application of electronic and electrical products in the information age has formed a complex electromagnetic environment and brought a lot of negative effects. , such as electromagnetic interference (EMI), the safety of electromagnetic information, and the harm of electromagnetic radiation to the human body. Therefore, as a medium that can effectively shield electromagnetic waves, absorbing materials have received...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05C09K3/00
CPCC01P2006/12C09K3/00
Inventor 祁阳戚聿杰
Owner NORTHEASTERN UNIV
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