Modified carbon aerogel and its preparation method and application

A carbon aerogel and aerogel technology, applied in the field of aerogel, can solve the problems of limiting the application of carbon aerogel, loss of carbon aerogel quality, and reduction of mechanical properties, and achieve macroscopic morphology and microstructure. Controlling, improving anti-oxidation performance, and easy operation

Active Publication Date: 2021-09-17
TANGSHAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although researchers have done a lot of work on the modification of carbon aerogels and achieved certain results, however, for the existing carbon aerogels, their oxidation resistance is weak, and under high temperature and aerobic conditions , is easily oxidized
In the air, when the external temperature rises to about 370 °C, carbon aerogels begin to have significant mass loss, and their mechanical properties continue to decrease, which greatly limits the performance of carbon aerogels in heat insulation, catalysis, adsorption and Applications in electrochemistry and other fields

Method used

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  • Modified carbon aerogel and its preparation method and application
  • Modified carbon aerogel and its preparation method and application
  • Modified carbon aerogel and its preparation method and application

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preparation example Construction

[0083] In a second aspect, a method for preparing a modified carbon aerogel is provided in at least one embodiment, comprising the following steps:

[0084] The modified carbon aerogel is obtained by mixing formula amounts of thermoplastic phenolic resin, curing agent, solvent and boron-containing compound, and undergoing sol-gel reaction and post-treatment.

[0085] Preferably, the above-mentioned modified carbon aerogel with excellent anti-oxidation performance uses thermoplastic phenolic resin as the reaction precursor, hexamethylenetetramine as the curing agent, organic alcohols as the main solvent, and water as the auxiliary solvent, Boric acid compounds are modifiers, which are prepared by sol-gel reaction, aging, drying at normal pressure, vacuum heat treatment and carbonization at high temperature.

[0086] It should be noted that the term "sol-gel" refers to a sol and a gel, and may also be referred to as a sol-gel. The sol can be converted to a gel by, for example, ...

Embodiment 1

[0122] 1. Modified carbon aerogel

[0123] It is mainly prepared from raw materials with the following mass ratios:

[0124] 10.0 g of thermoplastic phenol resin, 2.0 g of hexamethylenetetramine, 90.0 g of ethanol, 1.0 g of water, and 3.0 g of boric acid.

[0125] 2. Preparation of modified carbon aerogels

[0126] Include the following steps:

[0127] According to the ratio, weigh a certain amount of thermoplastic phenolic resin and curing agent hexamethylenetetramine respectively, add them to a reaction kettle containing a small amount of water and a certain amount of ethanol, and stir until the thermoplastic phenolic resin and curing agent are stirred under mechanical stirring. Completely dissolve to obtain a phenolic resin solution; then add a certain amount of boric acid, continue stirring to dissolve.

[0128] Pour the dissolved phenolic resin solution from the reactor into a plastic bottle or a stainless steel mold, then seal the mold, and place it in a constant temp...

Embodiment 2

[0130] 1. Modified carbon aerogel

[0131] It is mainly prepared from raw materials with the following mass ratios:

[0132] 15.0 g of thermoplastic phenolic resin, 4.0 g of hexamethylenetetramine, 85.0 g of isopropanol, 1.0 g of water, and 3.0 g of boric acid.

[0133] 2. Preparation of modified carbon aerogels

[0134] Include the following steps:

[0135] According to the proportion, weigh a certain amount of thermoplastic phenolic resin and curing agent hexamethylenetetramine respectively, add them to a reaction kettle containing a small amount of water and a certain amount of isopropanol, and under mechanical stirring until the thermoplastic phenolic resin and The curing agent is completely dissolved to obtain a phenolic resin solution; then a certain amount of boric acid is added, and the stirring is continued to dissolve;

[0136] The rest are the same as in Example 1.

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Abstract

The invention provides a modified carbon aerogel, a preparation method and application thereof, and relates to the technical field of aerogel. The modified carbon aerogel of the present invention is mainly prepared from the following raw materials in parts by mass: 5-60 parts of thermoplastic phenolic resin, 1-20 parts of curing agent, 40-100 parts of solvent and 1-10 parts of boron-containing compound. The method effectively avoids conventional complex processes such as solvent replacement and supercritical drying, has simple preparation process, low cost, easy processing and shaping and later dimension cutting; at the same time, the prepared modified carbon aerogel has excellent anti-oxidation performance, It has certain application prospects in the field of industrial thermal insulation and thermal protection in aerospace.

Description

technical field [0001] The invention belongs to the technical field of aerogels, and in particular relates to a modified carbon aerogel and a preparation method and application thereof. Background technique [0002] Carbon aerogel is a new type of porous carbon nanomaterial with continuous three-dimensional network structure, which has the characteristics of low density, high specific surface area and continuous pore structure. Due to its unique microstructure and good acid and alkali resistance, carbon aerogels have been widely used in adsorption separation, catalyst carrier, chromatographic packing, thermal insulation material and electrode material. Among them, organic aerogels are the precursors for forming carbon aerogels. The carbon aerogel precursors reported at home and abroad include resorcinol and formaldehyde aerogels, melamine formaldehyde aerogels, phenol furfural aerogels, Polycyanate series aerogels, most of the organic and carbon aerogels formed are bulky. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05C08J9/28C08L61/06C08K3/38C08K5/55
CPCC08J9/286C08J2201/0504C08J2205/026C08J2361/06C08K3/38C08K5/55C01B32/05
Inventor 贾献峰张立解舒世立陈伟付占达
Owner TANGSHAN NORMAL UNIV
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