Preparation method of heat-conducting and wave-absorbing composite aerogel and heat-conducting and wave-absorbing composite aerogel

A composite aerogel and composite gel technology, applied in the field of thermally conductive wave absorbing materials, can solve the problems of poor mechanical properties, large shrinkage, poor wave absorbing properties, etc. Insulation performance, the effect of improving absorption performance

Active Publication Date: 2022-08-02
彗晶新材料科技(杭州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pure alginate-based aerogels have poor wave-absorbing properties and large shrinkage during the preparation process, which can easily cause problems such as structural collapse, poor mechanical properties, and poor flame retardancy, which lead to poor overall performance. decline
And most of the research on heat insulation / wave absorption of aerogels only shows their excellent performance in a single direction, and there are relatively few studies on aerogels that integrate heat insulation and wave absorption

Method used

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  • Preparation method of heat-conducting and wave-absorbing composite aerogel and heat-conducting and wave-absorbing composite aerogel
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  • Preparation method of heat-conducting and wave-absorbing composite aerogel and heat-conducting and wave-absorbing composite aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Porous Magnetic Fe 3 O 4 @SiO 2 Preparation of @MWCNTs ternary nanocomposites:

[0032] (1) 1 g of MWCNTs was added to a mixed solution of 20 mL of deionized water and 80 mL of ethanol, followed by ultrasonic stirring for 30 min to obtain a suspension. 10 mL of ammonia water was added dropwise to the above suspension, and the stirring reaction was continued for 20 min. Then, 2.083 g of ethyl orthosilicate was slowly added dropwise and stirred for mixing, and the stirring reaction was continued for 12 h under water bath conditions. Then, the obtained powder was centrifuged, washed, and dried to obtain tubular SiO with a core-shell structure 2 @MWCNTs nanocomposites. The prepared SiO 2 The @MWCNTs nanocomposite was put into a muffle furnace for high temperature heat treatment, first heated to 400 °C for 3 h, then heated to 650 °C for 3 h, the heating rate was 3 ~ 5 °C / min, and then rapidly cooled to room temperature to obtain a surface rich in Defective core-shell s...

Embodiment 2

[0035] Porous Magnetic Fe 3 O 4 @SiO 2 Preparation of @MWCNTs ternary nanocomposites:

[0036] (1) 1 g of MWCNTs was added to a mixed solution of 20 mL of deionized water and 80 mL of ethanol, followed by ultrasonic stirring for 30 min to obtain a suspension. 10 mL of ammonia water was added dropwise to the above suspension, and the stirring reaction was continued for 20 min. Then, 2.083 g of ethyl orthosilicate was slowly added dropwise and stirred for mixing, and the stirring reaction was continued for 12 h under water bath conditions. Then, the obtained powder was centrifuged, washed, and dried to obtain tubular SiO with a core-shell structure 2 @MWCNTs nanocomposites. The prepared SiO 2 The @MWCNTs nanocomposite was put into a muffle furnace for high temperature heat treatment, first heated to 400 °C for 3 h, then heated to 650 °C for 3 h, the heating rate was 3 ~ 5 °C / min, and then rapidly cooled to room temperature to obtain a surface rich in Oxygen-deficient core-...

Embodiment 3

[0039] Preparation of SA-PA Aerogel:

[0040] 1 g of phytic acid PA (50 wt %) solution was added to 150 mL of deionized water, followed by ultrasonic stirring for 30 min to obtain a uniform suspension. Add 5g of sodium alginate SA to the above suspension, stir vigorously for 1h until the powder is completely dissolved to obtain a uniform SA-PA sol solution, then add 0.2g of gluconolactone to the above sol solution, stir vigorously for 30min to disperse uniform to obtain a precursor composite gel solution. The precursor composite gel solution was poured into a mold, frozen in two-way liquid nitrogen at -30 °C, and dried in a freeze-drying oven for 3 days to obtain SA-PA aerogels.

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Abstract

The embodiment of the invention discloses a preparation method of heat-conducting and wave-absorbing composite aerogel and the heat-conducting and wave-absorbing composite aerogel. The method comprises the following steps: step 1, coating multi-walled carbon nanotubes (MWCNTs) with silicon dioxide (SiO2) to prepare a SiO2 (at) MWCNTs nano composite material, and carrying out surface modification on the SiO2 (at) MWCNTs nano composite material; step 2, weighing polyvinylpyrrolidone, ethylene glycol and ferric chloride hexahydrate, mixing to obtain a Fe < 3 + > precursor solution, then adding the surface-modified SiO2 (at) MWCNTs nano composite material to obtain a mixed solution, then transferring the mixed solution into a reaction kettle for reaction, and drying to obtain a Fe3O4 (at) SiO2 (at) MWCNTs ternary nano composite material; 3, carrying out surface modification on the Fe3O4 (at) SiO2 (at) MWCNTs ternary nano composite material, then adding into water, and carrying out ultrasonic dispersion to prepare a suspension; step 4, adding phytic acid PA and alginate into the suspension while stirring, and then adding glucolactone to obtain a composite gel solution; and 5, introducing the composite gel solution into a mold, and freeze-drying to obtain the composite aerogel.

Description

technical field [0001] The invention relates to the field of heat-conducting wave-absorbing materials, in particular to a preparation method of a heat-conducting wave-absorbing composite aerogel and a heat-conducting wave-absorbing composite aerogel. Background technique [0002] With the development of modern science and technology, the requirements for materials have been further improved. Materials with a single function have been unable to meet the needs of multi-functionality. How to realize a single material with multiple functions to meet the needs of electronic equipment, aerospace, weapon equipment, etc. Due to the requirements of light weight, miniaturization and high reliability, the development of research towards the integration of structure and function of composite and multi-functional has become an inevitable trend of future development. With the rapid development of aerospace technology, weapon equipment and anti-reconnaissance radar, aircrafts are progressi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00C09K5/14H05K9/00
CPCB01J13/0091C09K5/14H05K9/0081Y02P20/10
Inventor 秦文波郭晶晶黄飞舒登峰孙佳晨陈昊
Owner 彗晶新材料科技(杭州)有限公司
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