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Preparation method of phenolic resin base carbon aerogel

A technology of carbon airgel and phenolic resin, applied in chemical instruments and methods, colloid chemistry, colloid chemistry, etc., can solve the problems of long gel time and aging time, high raw material price, slow reaction rate, etc., and shorten aging The effect of time, low price, and shortened production time

Inactive Publication Date: 2012-04-25
NAT UNIV OF DEFENSE TECH
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AI Technical Summary

Problems solved by technology

[0005] The preparation methods disclosed in the above-mentioned documents have at least one of the following disadvantages: 1. The price of raw materials is high; 2. The sol preparation process needs to add additional catalysts, thereby introducing impurities; 3. The temperature of gelation and aging is low (affected by limited by the boiling point of the solvent used), the reaction rate is slow, so the gel time and aging time are longer, usually it takes several days to age; 4. Solvent replacement is required, which takes several days

Method used

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  • Preparation method of phenolic resin base carbon aerogel
  • Preparation method of phenolic resin base carbon aerogel
  • Preparation method of phenolic resin base carbon aerogel

Examples

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Embodiment 1

[0020] This embodiment includes the following steps:

[0021] (1) Preparation of phenolic resin solution: Mix 100g of phenolic resin (purchased from Beijing Glass Steel Institute Composite Materials Co., Ltd., the aminophenolic resin is an ethanol solution, the original resin concentration is 68wt%) with 100g of methanol to make the phenolic resin in the solution The concentration in is 34wt%, stirs, forms transparent red solution;

[0022] (2) High temperature and high pressure gelation and aging: Pour the phenolic resin solution into a glass beaker, put the beaker into an autoclave, and add methanol equivalent to 15% of the volume of the autoclave into the autoclave (the autoclave in this embodiment The volume is 10L, the volume of methanol added is 1.5L), the mouth of the beaker is higher than the methanol liquid level in the autoclave, so that the phenolic resin solution and methanol are separated; fill nitrogen to the pressure of 2MPa to prevent the organic solvent from v...

Embodiment 2 to Embodiment 23

[0027] In embodiment 2 to embodiment 23, following each step processing parameter is listed in table 1:

[0028] (1) Types of organic solvents and resin concentrations during the preparation of phenolic resin solutions;

[0029] (2) Types of organic solvents, heating rate, holding temperature, and holding time during the high-temperature, high-pressure gelation and aging process;

[0030] (3) The drying temperature in the supercritical drying process;

[0031] (4) Protective gas and cracking temperature during cracking and carbonization.

[0032] Other processing parameters, reagent consumption are identical with embodiment 1.

[0033] The performance parameters of the carbon aerogels obtained in Examples 1 to 23 are listed in Table 2.

[0034] figure 2 It is a scanning electron micrograph of the carbon airgel obtained in Example 21. It can be seen from the figure that the particle size of the carbon airgel in Example 21 is relatively large, in the range of 50-150 nm. T...

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Abstract

A preparation method of a phenolic resin base carbon aerogel comprises steps of: (1) preparing a phenolic resin solution with a content of 10-50wt%; (2) gelling and ageing under high temperature and high pressure; (3) carrying out supercritical drying and discharging to obtain an organic aerogel; (4) cracking, carbonizing and discharging to obtain the aerogel. The preparation method of the carbon aerogel of the invention has the following three advantages: 1) a sodium carbonate catalyst does not need to be added in the first step, and the carbon aerogel has high purity and does not contain metal ion impurity; 2) the raw material phenolic resin is cheap; 3) a total process time is shortened that the organic aerogel can be obtained in one day and that the carbon aerogel can be obtained in two days.

Description

technical field [0001] The invention relates to a preparation method of airgel, in particular to a preparation method of phenolic resin-based carbon airgel. Background technique [0002] Carbon aerogels have unique properties, such as continuous porosity, low density, high specific surface area, high heat and sound insulation properties, high electrical conductivity, and ultra-high temperature thermal stability in non-oxidizing atmospheres, etc., which have great potential as adsorbents, chromatography packages, etc. Coating agents, gas diffusion electrodes, capacitive deionization, molecular sieves, thermal insulation materials for thermal protection systems, electrodes for supercapacitors or rechargeable batteries, advanced catalyst carriers for fuel cells, target materials for inertial confinement nuclear fusion, etc. Resorcinol-formaldehyde aerogels (RF) are the most studied organic aerogels and the most commonly used precursors for preparing carbon aerogels. Usually, R...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00
Inventor 冯坚冯军宗姜勇刚张长瑞
Owner NAT UNIV OF DEFENSE TECH
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