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Ceramic phenolic aerogel and preparation method thereof

A ceramicization and aerogel technology, applied in the direction of body insulation, weight reduction, etc., can solve the problems of low carbon residue rate of phenolic aerogel and cannot be used for a long time, so as to reduce the collapse of holes and improve the rate of carbon residue. , Improve the effect of heat insulation

Pending Publication Date: 2022-07-12
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention provides a method for improving the residual carbon rate of phenolic airgel in a high-temperature aerobic environment and the ceramizable phenolic airgel prepared therefrom, so as to solve the problem of phenolic airgel in a high-temperature aerobic environment in the prior art. The carbon residual rate is low, and it cannot be used for a long time in a high-temperature aerobic environment.

Method used

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  • Ceramic phenolic aerogel and preparation method thereof
  • Ceramic phenolic aerogel and preparation method thereof
  • Ceramic phenolic aerogel and preparation method thereof

Examples

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Effect test

Embodiment 1

[0029] A preparation method of ceramizable phenolic aerogel, the steps are as follows:

[0030] (1) Resorcinol, formaldehyde (in actual use, the formaldehyde solution produced by Shanghai Aladdin Reagent Co., Ltd., the mass fraction is 37wt%) and deionized water are mixed at 25 ° C according to the molar ratio of 1:3:13 , the precursor solution was obtained after stirring for 15 min, and the total mass of resorcinol and formaldehyde was recorded as 100 parts. TiB 2 Powder and B 4 The C powder was mixed uniformly at a mass ratio of 1:1 to prepare a ceramizable filler, 10 parts of the ceramizable filler were added to the precursor solution, and a suspension was obtained after stirring for 10 minutes, and the suspension was transferred into the mold.

[0031] (2) adding trifluoroacetic acid accounting for 5% of the suspending liquid fraction into the mold, after 15-40 s of sol-gel reaction, the gel can be gelled, and then the aging reaction is continued for 1 h to obtain a cera...

Embodiment 2

[0033] A preparation method of ceramizable phenolic aerogel, the steps are as follows:

[0034] (1) Mix resorcinol, formaldehyde and deionized water at 25°C according to a molar ratio of 1:3:13, obtain a precursor solution after stirring for 20min, and record the mass sum of resorcinol and formaldehyde as 100 share. TiB 2 Powder and B 4 The C powder was uniformly mixed at a mass ratio of 1:1 to prepare a ceramizable filler, 30 parts of the ceramizable filler was added to the precursor solution, and a suspension was obtained after stirring for 20 minutes, and the suspension was transferred into the mold.

[0035] (2) adding trifluoroacetic acid accounting for 5% of the suspending liquid fraction into the mold, after 15-40 s of sol-gel reaction, the gel can be gelled, and then the aging reaction is continued for 1 h to obtain a ceramizable phenolic hydrogel. The ceramizable phenolic hydrogel was demolded and placed in a drying oven for drying at atmospheric pressure step-up h...

Embodiment 3

[0037] A preparation method of ceramizable phenolic aerogel, the steps are as follows:

[0038] (1) Mix resorcinol, formaldehyde and deionized water at 25°C according to a molar ratio of 1:3:13, obtain a precursor solution after stirring for 20min, and record the mass sum of resorcinol and formaldehyde as 100 share. TiB 2 Powder and B 4 The C powder was uniformly mixed at a mass ratio of 1:1 to prepare a ceramizable filler, and 50 parts of the ceramizable filler was added to the precursor solution, stirred for 20 minutes to obtain a suspension, and the suspension was transferred into the mold.

[0039] (2) adding trifluoroacetic acid accounting for 5% of the suspending liquid fraction into the mold, after 15-40 s of sol-gel reaction, the gel can be gelled, and then the aging reaction is continued for 1 h to obtain a ceramizable phenolic hydrogel. The ceramizable phenolic hydrogel was demolded and placed in a drying oven for drying at atmospheric pressure step-up heating. Th...

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Abstract

The invention discloses a ceramizable phenolic aerogel and a preparation method thereof. The preparation method comprises the following steps: preparing a precursor solution, uniformly mixing the precursor solution, a ceramizable filler and an acid catalyst, pouring the mixture into a mold, and obtaining ceramizable phenolic aldehyde hydrogel after gelation and aging; demoulding the ceramizable phenolic aldehyde hydrogel, and then putting the ceramizable phenolic aldehyde hydrogel into a drying oven to carry out normal-pressure stepped heating drying, so as to prepare ceramizable phenolic aldehyde aerogel; the ceramizable phenolic aerogel disclosed by the invention has the advantages of lower heat conductivity coefficient, lower density, higher compression strength, higher residual carbon rate after high-temperature carbonization treatment, low cost, simple process and the like, and has a wide application prospect.

Description

technical field [0001] The invention relates to the field of thermal protection composite materials, in particular to a ceramizable phenolic aerogel and a preparation method thereof. Background technique [0002] Phenolic aerogel is a porous, disordered, amorphous solid material with a continuous network structure composed of organic clusters. It has unique properties such as high porosity and low thermal conductivity. It is the first choice for the integration of anti-thermal insulation of aircraft. Material. However, when phenolic aerogels serve in a high-temperature aerobic environment, reactions such as oxidation and cracking will occur, which will not only cause damage to the pore structure, but also reduce the carbon residue rate of the aerogel in a high-temperature aerobic environment. After the glue was carbonized in a muffle furnace at 1000℃ for 20min, the residual carbon rate was only 18.22%. With the continuous improvement of the flight speed of aerospace high-s...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08L61/10C08K3/38B64C1/40
CPCC08J3/075B64C1/40C08J2361/10C08K3/38Y02T50/40
Inventor 石敏先李鹏飞
Owner WUHAN UNIV OF TECH
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