Method for wave absorbing material and application of wave absorbing material

A microwave-absorbing material and microwave-absorbing technology, applied in the field of microwave-absorbing materials, can solve the problems of high density, complex operation process, and high cost, and achieve the effect of high thickness controllability and excellent integrity

Inactive Publication Date: 2015-01-21
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned operation process is more complicated and the cost is higher, and it is necessary to further develop a cheap and simple preparation process.
Carbon materials are also widely used in the field of microwave absorption due to their unique physical and chemical properties. Among them, carbon-coated nano-metal materials are a class of materials that have been widely studied, but their shortcomings such as high density, narrow frequency band, and short life limit their use. further application

Method used

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  • Method for wave absorbing material and application of wave absorbing material
  • Method for wave absorbing material and application of wave absorbing material
  • Method for wave absorbing material and application of wave absorbing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 100g of medium-temperature coal tar pitch and 300g of tetrahydrofuran, put them in a beaker, and stir for 10 minutes; soak a 30cm×15cm×10cm polyurethane foam in the solution, take it out, squeeze it repeatedly with filter paper, and put the squeezed polyurethane foam with solution in Dry in the air for 15 minutes; place the dried polyurethane foam in a muffle furnace for oxidative curing, the temperature rises from room temperature to 300 ℃ at a rate of 1 ℃ / min, keep the temperature constant for 60 minutes, and cool naturally to room temperature; in addition, oxidative curing During the treatment process, it is necessary to add high-temperature-resistant and low-density thin plates on both sides of the polyurethane foam for fixing to prevent the polyurethane foam from bending; then cut the oxidized and cured polyurethane foam into 15cm×22cm and place it in a muffle furnace for heating and carbonization For processing, under the protection of nitrogen, the temperatu...

Embodiment 2

[0027] Weigh 50g of coal liquefaction residue tetrahydrofuran solubles and 150g of tetrahydrofuran in a beaker, and stir for 5 minutes; soak 30cm×15cm×1.0cm polyurethane foam in the solution, take it out, and squeeze it repeatedly with filter paper, and then squeeze it with The polyurethane foam of the solution was dried in the air for 20 minutes; the dried polyurethane foam was placed in a muffle furnace for oxidative curing, the temperature was raised from room temperature to 350 °C at a rate of 0.5 °C / min, kept at a constant temperature for 10 min, and naturally cooled to room temperature ;In addition, during the oxidation curing process, it is necessary to add high-temperature resistant and low-density thin plates on both sides of the polyurethane foam for fixing to prevent the polyurethane foam from bending; then cut the polyurethane foam after oxidation and curing into 15cm×22cm and place it in a muffle Carry out temperature-rising carbonization treatment in the furnace. ...

Embodiment 3

[0029] Weigh 100g of petroleum asphalt, 5g of iron acetate and 300g of tetrahydrofuran in a beaker and stir for 15 minutes; soak a 30cm×15cm×0.8cm polyurethane foam in the solution and take it out, use filter paper to squeeze repeatedly, and then squeeze the solution with The polyurethane foam was dried in the air for 25 minutes; the dried polyurethane foam was placed in a muffle furnace for oxidative curing treatment, the temperature was raised from room temperature to 300 °C at a rate of 1.0 °C / min, kept at a constant temperature for 10 min, and naturally cooled to room temperature; In addition, during the oxidation curing process, it is necessary to add high-temperature resistant and low-density thin plates on both sides of the polyurethane foam for fixing to prevent the polyurethane foam from bending; then cut the polyurethane foam after oxidation and curing into 15cm×22cm and place it in the muffle furnace Under the protection of nitrogen, the temperature was raised from r...

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Abstract

The invention relates to the technical field of wave absorbing materials. A preparation method of a wave absorbing material includes the steps of firstly, dissolving an organic carbon source and metal salt in organic solvent, and conducting stirring to form a solution; secondly, soaking polyurethane foam in the solution obtained in the first step, taking out the polyurethane foam, repeatedly squeezing the polyurethane foam through filter paper, and placing the squeezed polyurethane foam with the solution in air to be dried; thirdly, cooling the dried polyurethane foam to the room temperature after conducting temperature rising, oxidation and solidification on the dried polyurethane foam obtained in the second step under the atmosphere of air; fourthly, conducting temperature rising and carbonization on the oxidized and solidified polyurethane foam obtained in the third step under the protection of the inert atmosphere, and cooling the polyurethane foam to the room temperature so as to obtain the required target material. The preparation process which is adopted is easy to operate, high in carbon yield, short in reaction time and low in material cost and can be directly used for microwave absorbing without conducting secondary processing, and the product has the advantages of being small in density, wide in wave absorbing frequency band, high in absorbing strength, resistant to the high temperature and the like.

Description

technical field [0001] The invention relates to a preparation method of a wave-absorbing material, which belongs to the technical field of wave-absorbing materials. Background technique [0002] With the advancement of science and technology, electronic technology, information technology, military technology and equipment technology have developed rapidly by leaps and bounds, and electromagnetic wave technology has continuously made breakthroughs and progress, which has brought great benefits to the development of human society. play an irreplaceable role. However, with the continuous expansion of electromagnetic wave application fields, the harm caused by its negative interference has gradually attracted people's attention. The deteriorating electromagnetic environment will generate electromagnetic interference, affect communication, electronic and other systems, and pose a threat to people's health. In addition, in the military field, the quality of stealth technology wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q17/00H05K9/00C09K3/00C01B31/02
Inventor 邱介山肖南王帅张梅霞
Owner DALIAN UNIV OF TECH
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