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A method for rapidly preparing high-strength carbon foam

A carbon foam, high-strength technology, applied in chemical instruments and methods, carbon preparation/purification, ceramic products, etc., can solve the problems of wide application limitation, increase preparation cost, limit high-strength carbon foam, etc., and achieve a simple process route. , The effect of shortening the preparation cycle and lowering the cost

Active Publication Date: 2022-07-08
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In other words, the development of high-strength carbon foams is limited due to the special nature of the porous structure, and their widespread application is thus limited.
In addition, the preparation of carbon foam in the prior art often takes tens or even hundreds of hours, which increases the preparation cost

Method used

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  • A method for rapidly preparing high-strength carbon foam
  • A method for rapidly preparing high-strength carbon foam
  • A method for rapidly preparing high-strength carbon foam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) To prepare carbon foam with a specific gravity of resin and quartz of 3:1, first prepare 15 g of thermosetting phenolic resin (viscosity: 16000~19000 MP / 25°C; residual carbon rate: 40~45%; purity: 99%), The particle size is 2000 mesh quartz powder 5 g (main component: SiO 2 , purity: 99%), the quartz powder was dried in a box-type resistance furnace at 100 °C for 1 h and used for later use;

[0038](2) Pour the phenolic resin into the mortar, slowly add the quartz powder, and keep stirring, stop stirring for more than 30 minutes, add a small amount of curing agent (benzenesulfonic acid), and continue stirring for 8-10 minutes until the slurry is mixed For a viscous state, pour the prepared mixed slurry into a prefabricated cylindrical mold;

[0039] (3) Put the prefabricated embryo body slurry in the air at room temperature, and let it stand for 24 hours until the embryo body slurry is solidified and shaped;

[0040] (4) Place the solidified foam embryo in a box-t...

Embodiment 2

[0046] (1) To prepare carbon foam with a specific gravity of resin and quartz of 1:1, first prepare 10 g of thermosetting phenolic resin (viscosity: 16000~19000 MP / 25℃; residual carbon rate: 40~45%; purity: 99%), The particle size is 2000 mesh quartz powder 10 g (main component: SiO 2 , purity: 99%), the quartz powder was dried in a box-type resistance furnace at 100 °C for 1 h and used for later use;

[0047] (2) Pour the phenolic resin into the mortar, slowly add the quartz powder, and keep stirring, stop stirring for more than 30 minutes, add a small amount of curing agent (benzenesulfonic acid), and continue stirring for 8-10 minutes until the slurry is mixed For a viscous state, pour the prepared mixed slurry into a prefabricated cylindrical mold;

[0048] (3) Put the prefabricated embryo body slurry in the air at room temperature, and let it stand for 24 hours until the embryo body slurry is solidified and shaped;

[0049] (4) Place the solidified foam embryo in a box-...

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Abstract

A method for rapidly preparing light-weight and high-strength carbon foam, comprising the following steps: step (1) mechanically stirring a commercial phenolic resin and 2000-mesh quartz powder for more than 30 minutes to uniformly mix; step (2) adding a small amount of benzenesulfonic acid , as a curing agent, continue to stir for about 10 minutes and mix evenly to obtain a mixed slurry; step (3) pour the mixed slurry into a cylindrical mold, and cure it in a box-type resistance furnace at 100 °C for 2 h; step (4) The solidified foam body is placed in a vacuum tube type resistance heating furnace, the vacuum degree is ‑0.1MPa, and the temperature rise rate is 5~15 °C / min to 1000 °C, and after holding for 3 hours, it is cooled to room temperature with the furnace to complete the process. Carbonization of the foam embryo; Step (5) The carbonized foam embryo is placed in HF acid for ultrasonic etching for more than 48 hours to filter out the quartz template to obtain the final carbon foam product.

Description

technical field [0001] The present invention relates to inorganic porous material technology, in particular to the preparation technology of carbon foam with low density and high strength. Background technique [0002] Carbon foam is widely used because of its special structure, low density, high porosity, low thermal expansion coefficient, large specific surface area, excellent oxidation resistance, low cost, excellent sound absorption performance and electromagnetic shielding performance. It is used in aerospace, nuclear industry, supercapacitor and catalyst carrier and other industrial fields. [0003] There are two main microstructures of carbon foams, one is an open reticulated glassy structure, and the other is a spherical porous structure. Different structures endow it with different characteristics. For example, the reticulated glassy carbon foam generally presents an open-cell structure, and the open pores are conducive to the adsorption of carbon foam. In addition...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05C01B32/00C04B35/524C04B35/622C04B38/00
CPCC04B35/524C04B35/622C04B38/0022C04B2235/3418C04B2235/5436C04B2235/6562C04B2235/6567C04B2235/77C04B2235/96
Inventor 贾建刚巨佳康高康博潘子康钮超季根顺
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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