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High-strength carbon aerogel as well as preparation method and application thereof

A carbon aerogel, high-strength technology, applied in the preparation/purification of carbon, chemical instruments and methods, colloid chemistry, etc., can solve the problems of restricting large-scale production and application, poor mechanical properties, cumbersome steps, etc., and achieve shortened preparation Cycle time, good molding ability, and the effect of simplifying the preparation process

Inactive Publication Date: 2019-06-07
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solvent replacement requires a large number of liquids with low surface tension such as ethanol and acetone to repeatedly replace the water in the wet gel. The steps are cumbersome and take a long time. The poor mechanical properties of the gel seriously restrict its large-scale production and application
On this basis, the phenolic and carbon aerogels prepared by normal pressure drying method have high density and poor mechanical properties due to severe shrinkage during the drying process (Wu D, Fu R. Journal of Porous Materials 2008,15:29- 34)
In the relevant reports on the preparation of phenolic and carbon aerogels with phenolic resin as raw material, the solvent is limited and the reaction temperature is low, resulting in a slow reaction rate and a long preparation cycle (Jia X, Dai B, Zhu Z, et al.Carbon2016,108:551-560.)

Method used

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  • High-strength carbon aerogel as well as preparation method and application thereof
  • High-strength carbon aerogel as well as preparation method and application thereof
  • High-strength carbon aerogel as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Mix phenolic resin, ethylene glycol, hexamethylenetetramine, and water in a weight ratio of 63:139:5:2, stir for 30 minutes, place in a dry box, keep warm at 50°C for 5 hours, and Insulate at 110°C for 15 hours, and at 170°C for 3 hours to obtain a wet gel. Dry the wet gel in a drying oven at 80°C for 30 hours at normal pressure to obtain a phenolic airgel. Put the obtained phenolic airgel into In the carbonization furnace, the temperature was raised to 900°C under the protection of argon, and the high-strength carbon airgel was obtained after holding the heat for 3 hours. The prepared phenolic airgel has a bulk density of 0.43g / cm 3 , the compressive strength is 6.3MPa, and the volume density of the carbon airgel obtained after carbonization is 0.52g / cm 3 , The compressive strength is 53.1MPa. figure 1 It is phenolic airgel (density 0.43g / cm 3 ) and the corresponding carbon aerogel (0.51g / cm 3 ) load-displacement curves, the compressive strengths are 6.3MPa and 53....

Embodiment 2

[0036] Mix phenolic resin, ethylene glycol, hexamethylenetetramine, and water in a weight ratio of 38:138:5:2, stir for 30 minutes, place in a dry box, and keep it warm for 5 hours at a temperature of 50°C. Insulate at 110°C for 15 hours, and at 170°C for 3 hours to obtain a wet gel. Dry the wet gel in a drying oven at 80°C for 30 hours at normal pressure to obtain a phenolic airgel. Put the obtained phenolic airgel into In the carbonization furnace, the temperature was raised to 900°C under the protection of argon, and the carbon aerogel was obtained after keeping the temperature for 3 hours. The prepared phenolic airgel has a bulk density of 0.19 g / cm 3 , the compressive strength is 0.8MPa, and the volume density of the carbon airgel obtained after carbonization is 0.24g / cm 3 , The compressive strength is 1.7MPa. image 3 It is phenolic airgel (density 0.19g / cm 3 ) and the corresponding carbon aerogel (0.24g / cm3 ) load-displacement curves, the compressive strengths are 0....

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Abstract

The invention discloses high-strength carbon aerogel as well as a preparation method and application thereof, and belongs to the technical field of preparation of phenolic and carbon aerogel. The preparation method comprises the following steps: industrial phenolic resin is used as a raw material, hexamethylenetetramine is used as a curing agent, ethylene glycol and water are used as solvents, mixing is performed, a sol-gel reaction is performed at a certain temperature, normal-pressure drying is performed to obtain phenolic aerogel, and carbonization is performed at a high temperature to obtain the carbon aerogel, wherein the aerogel microstructure is a three-dimensional network structure in which particles are interconnected. The preparation technology of the aerogel provided by the invention has the following three advantages: 1) the raw material is the industrial phenolic resin, so that the source is wide and the price is low; 2) the preparation cycle is short, the mixed liquid issolidified to obtain a wet gel without solvent replacement, the phenolic aerogel can be obtained by direct drying, and the preparation cycle is 2-3 days; and 3) normal-pressure drying is adopted, theequipment requirements are simple, and the processability is good.

Description

technical field [0001] The invention relates to the technical field of preparation of phenolic and carbon aerogels, in particular to a high-strength carbon aerogel and its preparation method and application. Background technique [0002] As one of the three major synthetic resins, phenolic resin has been widely used in many fields such as transportation, construction, energy, chemical industry and national defense industry after more than 100 years of development. Currently, the preparation of aerogels with various nanostructures using phenolic resin as a precursor has attracted widespread attention. Airgel is a unique nanoparticle-connected porous network structure with unique properties, such as high porosity, high specific area, low density, high thermal insulation performance, and ultra-high temperature thermal stability in a non-oxidizing atmosphere. Adsorbents, gas diffusion electrodes, molecular sieves, thermal insulation materials for thermal protection systems, sup...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05B01J13/00B01J20/20B01J20/28B01J20/30
Inventor 汤素芳郭鹏磊李建庞生洋胡成龙
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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