High-strength large-size block carbon aerogel and preparation method and application thereof

A carbon aerogel and large-scale technology, which is applied in the field of high-strength and large-size block carbon aerogel and its preparation, can solve the problems of not improving the network structure of the organic gel and the limited effect of strength improvement, so as to inhibit the growth of cracks. , good molding ability, the effect of improving the degree of cross-linking

Pending Publication Date: 2017-12-15
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method reduces the surface tension of the solvent during normal pressure drying, but the stren...

Method used

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  • High-strength large-size block carbon aerogel and preparation method and application thereof
  • High-strength large-size block carbon aerogel and preparation method and application thereof
  • High-strength large-size block carbon aerogel and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Mix resorcinol, 37wt.% formaldehyde solution, deionized water, and anhydrous sodium carbonate at a mass ratio of 2637:2637:5776:1 and heat in a water bath. When the temperature of the water bath is adjusted to 15°C, the holding time 30 hours; when the temperature of the water bath is adjusted to 45°C, the holding time is 20 hours; when the temperature of the water bath is adjusted to 65°C, the holding time is 20 hours; when the temperature of the water bath is adjusted to 95°C, the holding time is 10 hours to obtain a wet gel. The obtained wet gel was soaked in absolute ethanol 10 times the volume of the gel at 50°C for 24 hours, and this step was repeated 4 times. Afterwards, the wet gel was dried at 50 °C for 7 days in an atmospheric drying oven. The dried gel was placed in a carbonization furnace under the protection of argon, and the temperature was raised from room temperature to 900°C at a heating rate of 5°C / min. After two hours of heat preservation, it was coole...

Embodiment 2

[0033] Mix resorcinol, 37wt.% formaldehyde solution, deionized water, and anhydrous sodium carbonate at a mass ratio of 1030:1530:2880:1 to obtain a mixed solution and heat it in a water bath, and adjust the temperature of the water bath to 30°C When the temperature of the water bath is adjusted to 50°C, the holding time is 50 hours; when the temperature of the water bath is adjusted to 75°C, the holding time is 30 hours; when the temperature of the water bath is adjusted to 95°C, the holding time is 10 hours. wet gel. The obtained wet gel was soaked in absolute ethanol 10 times the volume of the gel at 50°C for 24 hours, and this step was repeated 4 times. Afterwards, the obtained wet gel was dried in an atmospheric drying oven at 50°C for 7 days. The dried gel was placed in a carbonization furnace under the protection of argon, and the temperature was raised from room temperature to 900°C at a heating rate of 5°C / min. After two hours of heat preservation, it was cooled with...

Embodiment 3

[0036] Mix resorcinol, 37wt.% formaldehyde solution, deionized water, and anhydrous sodium carbonate in a mass ratio of 520:760:1440:1 and heat in a water bath: when the temperature of the water bath is adjusted to 45°C, keep warm The time is 80 hours; when the temperature of the water bath is adjusted to 65°C, the holding time is 70 hours; when the temperature of the water bath is adjusted to 95°C, the holding time is 50 hours to obtain a wet gel. Soak the obtained wet gel in absolute ethanol 10 times the volume of the gel at 50° C. for 24 hours, and repeat this step 4 times. Afterwards, the obtained wet gel was dried in an atmospheric drying oven at 50°C for 7 days. The dried gel was placed in a carbonization furnace under the protection of argon, and the temperature was raised from room temperature to 900°C at a heating rate of 5°C / min. After two hours of heat preservation, it was cooled with the furnace to obtain a high-strength carbon aerogel.

[0037] The carbon airgel ...

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Abstract

The invention discloses high-strength large-size block carbon aerogel and a preparation method and application thereof, and belongs to the technical field of carbon aerogel preparation. Resorcinol and formaldehyde are taken as raw materials, anhydrous sodium carbonate is taken as a catalyst, deionized water is a solvent, a sol-gel reaction is carried out, and normal-pressure drying and high-temperature carbonization are preformed to obtain high-strength large-size block carbon aerogel. The size of the block carbon aerogel is no less than 100 mm*100 mm*30 mm. With density variation of carbon aerogel, the size of carbon particles is adjustable between 30-800 nm. The carbon particles are mutually connected to form a three-dimensional network skeleton structure. The prepared carbon aerogel has the density of 0.3-0.6 g/cm<3>, the compression strength as high as 10-65 MPa, and the thermal conductivity of 0.06-0.09 W/(m*K), and can be directly applied to a heat insulation material.

Description

technical field [0001] The invention relates to the technical field of carbon aerogel preparation, in particular to a high-strength and large-size block carbon aerogel and its preparation method and application. Background technique [0002] Airgel is composed of a unique nanoparticle network porous structure. As a "super thermal insulation material", it has been widely concerned. The common ones are SiO 2 、Al 2 o 3 , ZrO 2 , carbon aerogels, etc. Although the thermal conductivity of airgel materials is very low, its solid-phase skeleton particles are easy to sinter at high temperatures, which limits its high-temperature resistance. SiO 2 The maximum service temperature of airgel generally does not exceed 800 ° C, Al 2 o 3 The highest service temperature of airgel generally does not exceed 1100 ° C, while ZrO 2 The maximum service temperature of airgel is only ~600°C. Carbon airgel has high thermal stability, and can still maintain a mesoporous structure in an inert...

Claims

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Application Information

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IPC IPC(8): C01B32/05
CPCC01P2004/03C01P2006/10C01P2006/21C01P2006/32
Inventor 汤素芳杨鸷庞生洋胡成龙成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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