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Nano-grade porous aerogel and preparation method thereof

A nanoporous carbon and aerogel technology, which is applied in the preparation/purification of carbon, nanotechnology and other directions, can solve the problems that restrict the industrial production of carbon aerogel and its comprehensive and wide application, the unsafe preparation process, and the lengthy preparation cycle. problems, to achieve the effect of good market prospects, low equipment requirements, and environmental friendliness

Inactive Publication Date: 2012-06-27
TIANJIN KINGRAY NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The comparatively mature carbon airgel preparation method at present is the U.S. Patent No. US19890406009, US19880199404 invented by Pekala et al. Production cost, and not environmental protection, restricts the industrial production and comprehensive application of carbon aerogels
The Chinese Patent No. CN200610021241.X of the patent "Carbon Airgel Powder and Its Preparation Method" invented by Wang Chaoyang and others also uses ethanol supercritical drying and low-temperature ultrasonic technology, which does not fundamentally solve the problem of low production efficiency and cost. Too high a constraint
The patent "A Method for Preparing Carbon Airgel" invented by Zhu Zhenping and others, the Chinese patent number is CN01120419.2, due to the introduction of heating and explosion process in the preparation process, there are unsafe factors in the preparation process

Method used

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  • Nano-grade porous aerogel and preparation method thereof
  • Nano-grade porous aerogel and preparation method thereof
  • Nano-grade porous aerogel and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] 1) Preparation of organic wet gel: the reactant resorcinol and formaldehyde are mixed in a molar ratio of 1 / 2, then deionized water is added as a solvent to form a reaction solution with a mass percentage of 30%. A sodium carbonate solution with a concentration of 0.05mol / L is used as a catalyst. After stirring evenly, seal it, put it in an oven, and treat it at 30°C for 1 day, at 50°C for 1 day, and at 90°C for 3 days, and finally obtain Resorcinol-formaldehyde wet gel;

[0024] 2) Solvent replacement: Soak the resorcinol-formaldehyde wet gel prepared in step 1) in acetone for solvent replacement, and replace the acetone every 24 hours for 3 times. Obtain resorcinol-formaldehyde organic airgel;

[0025] 3) Atmospheric pressure drying: drying at normal temperature and pressure, that is, at a temperature of 20-30° C., at a standard atmospheric pressure, and allowing the acetone to evaporate naturally, to obtain a dried resorcinol-formaldehyde organic airgel;

[0026] 4...

Embodiment 2

[0029] 1) Preparation of organic wet gel: the reactant resorcinol and formaldehyde are mixed in a molar ratio of 1 / 2, and then deionized water is added as a solvent to form a reaction solution with a mass percentage of 32%. A sodium carbonate solution with a concentration of 0.05mol / L is used as a catalyst. After stirring evenly, seal it, put it in an oven, and treat it at 30°C for 1 day, at 50°C for 1 day, and at 90°C for 3 days, and finally obtain Resorcinol-formaldehyde wet gel;

[0030] 2) Solvent replacement: Soak the resorcinol-formaldehyde wet gel prepared in step 1) in acetone for solvent replacement. During this period, replace the acetone every 24 hours for 4 times. After the acetone volatilizes completely, the Obtain resorcinol-formaldehyde organic airgel;

[0031] 3) Atmospheric pressure drying: drying at normal temperature and pressure, that is, at a temperature of 20-30° C., at a standard atmospheric pressure, and allowing the acetone to evaporate naturally, to ...

Embodiment 3

[0035] 1) Preparation of organic wet gel: the reactant resorcinol and formaldehyde are mixed in a molar ratio of 1 / 2, and then deionized water is added as a solvent to form a reaction solution with a mass percentage of 33%. A sodium carbonate solution with a concentration of 0.05mol / L is used as a catalyst. After stirring evenly, seal it, put it in an oven, and treat it at 30°C for 1 day, at 50°C for 1 day, and at 90°C for 3 days, and finally obtain Resorcinol-formaldehyde wet gel;

[0036] 2) Solvent replacement: Soak the resorcinol-formaldehyde wet gel prepared in step 1) in acetone for solvent replacement. During this period, replace the acetone every 24 hours for 5 times. After the acetone volatilizes completely, the Obtain resorcinol-formaldehyde organic airgel;

[0037] 3) Atmospheric pressure drying: drying at normal temperature and pressure, that is, at a temperature of 20-30° C., at a standard atmospheric pressure, and allowing the acetone to evaporate naturally, to ...

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Abstract

The invention provides nano-grade porous aerogel and a preparation method thereof. The method comprises steps of organic wet gel preparing, solvent replacing, normal-pressure drying, and high-temperature carbonizing. With the method, the prepared nano-grade porous aerogel has parameters of: a pore size distribution of 1-2nm, a specific surface area of 850-900m<2> / g, a porosity of 81-89%, a density of 280-325mg / cm<3>, and an electrical resistivity of 0.045-0.06ohm*mm. The method provided by the invention is advantaged in that: with the method for preparing the nano-grade porous aerogel, the prepared nano-grade porous aerogel is characterized by high specific surface area, high porosity, high density, and low electrical resistivity. The aerogel can be widely applied in fields of super-capacitor electrodes, catalysts, catalyst carriers, gas absorption, and the like. The aerogel has a good market prospect. The preparation process is simple, convenient, and easy to operate. The production period is short, the requirement on equipment is low, and the aerogel and the method are environment friendly.

Description

technical field [0001] The invention relates to a carbon airgel, in particular to a nanoporous carbon airgel and a preparation method thereof. Background technique [0002] Carbon aerogel is a new type of nanoporous carbon material with a cross-linked structure produced by solid-phase carbonization of organic aerogels. It is the only aerogel with electrical conductivity and chemical stability. Its density changes Wide range, adjustable structure, porosity up to 80%-99.8%, pore diameter generally <50nm, specific surface area up to 400-1000m 2 / g. Materials with this special structure have broad application prospects. In 1987, Pekala of the United States used resorcinol-formaldehyde as the raw material for the first time to obtain organic aerogels and carbon aerogels through sol-gel process under alkaline catalytic conditions, pickling aging, supercritical drying and carbonization. It marked the beginning of organic aerogel research. In the next ten years, researchers f...

Claims

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Application Information

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IPC IPC(8): C01B31/02C01B31/00B82Y40/00C01B32/05
Inventor 沈军关大勇王景林
Owner TIANJIN KINGRAY NEW ENERGY TECH
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