Preparation method for high-temperature-resistant thermal-insulation aerogel felt

An aerogel felt, high temperature resistant technology, applied in the field of aerogel felt, can solve the problems of low solid content, low mechanical strength, poor machinability and the like

Inactive Publication Date: 2018-10-23
GONG YI VAN-RES INNOVATION COMPOSITE MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although silica airgel has broad application prospects and great practical value, there is a bottleneck in the application process: because the solid content of pure silica airgel is very low, and the skeleton is composed of nano-scale particles. structure, the mechanical strength of pure silica is very low, the macroscopic performance is brittle, and the machinability in the practical process is very poor, which poses a huge challenge to the matching of component sizes in the application process and the demand for special-shaped components

Method used

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  • Preparation method for high-temperature-resistant thermal-insulation aerogel felt

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A kind of preparation method of high temperature resistant heat insulation airgel felt, the steps are as follows:

[0031] (1) Disperse SiC whiskers (200nm in diameter) and cellulose in a graphene aqueous suspension (solid content: 3g / L) to obtain suspension A;

[0032] (2) Add hollow glass microspheres to suspension A under stirring to obtain suspension B;

[0033] (3) Mix ethyl orthosilicate, absolute ethanol and water evenly, then add 2mol / L NH 4 Stir F solution and 0.2moL / L ammonia water evenly to obtain silica sol C;

[0034] (4) Add the suspension B into the silica sol C under stirring, and use it to soak the glass fiber mat after stirring evenly (in actual operation, the glass fiber mat can be placed in a container in advance, and then injected into the second The mixture of silica sol and slurry B), impregnate the glass fiber mat on a vibrating platform (vibration power is 1.6 KW, vibration frequency is 400 HZ, vibration time is 1 h), after dipping for 48 h, t...

Embodiment 2

[0043] A kind of preparation method of high temperature resistant heat insulation airgel felt, the steps are as follows:

[0044] (1) Disperse SiC whiskers (diameter: 150nm) and cellulose in graphene aqueous suspension (solid content: 2g / L) to obtain suspension A;

[0045] (2) Add hollow glass microspheres to suspension A under stirring to obtain suspension B;

[0046](3) Mix ethyl orthosilicate, absolute ethanol and water evenly, then add 2mol / L NH 4 Stir F solution and 0.2moL / L ammonia water evenly to obtain silica sol C;

[0047] (4) Add the suspension B into the silica sol C under stirring, and use it to soak the glass fiber mat after stirring evenly (in actual operation, the glass fiber mat can be placed in a container in advance, and then injected into the second Mixture of silica sol and slurry B), impregnate the glass fiber mat on a vibration platform (vibration power 1.3KW, vibration frequency 300 HZ, vibration time 1.5h), after 36h of impregnation, take out the gla...

Embodiment 3

[0056] A kind of preparation method of high temperature resistant heat insulation airgel felt, the steps are as follows:

[0057] (1) Disperse SiC whiskers (100nm in diameter) and cellulose in graphene aqueous suspension (solid content: 5g / L) to obtain Suspension A;

[0058] (2) Add hollow glass microspheres to suspension A under stirring to obtain suspension B;

[0059] (3) Mix ethyl orthosilicate, absolute ethanol and water evenly, then add 2mol / L NH 4 Stir F solution and 0.2moL / L ammonia water evenly to obtain silica sol C;

[0060] (4) Add the suspension B into the silica sol C under stirring, and use it to soak the glass fiber mat after stirring evenly (in actual operation, the glass fiber mat can be placed in a container in advance, and then injected into the second Mixture of silica sol and slurry B), impregnate the glass fiber mat on a vibrating platform (vibration power 1.8 KW, vibration frequency 500HZ, vibration time 2h), after 24h of impregnation, take out the gl...

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Abstract

The invention belongs to the field of aerogel felts, and discloses a preparation method for a high-temperature-resistant thermal-insulation aerogel felt. The preparation method comprises the followingsteps that SiC whiskers and cellulose are dispersed in a graphene aqueous suspension so as to obtain a suspension A; hollow glass micro-beads are added into the suspension A under the action of stirring so as to obtain a suspension B; n-silicate, ethanol and water are uniformly mixed, then a NH4F solution and ammonia water are sequentially added and uniformly stirred so as to obtain silica sol C;the suspension B is added into the silica sol C under the action of stirring, after uniform stirring is carried out, the mixture is used for soaking a fibrofelt, and immersion treatment is carried out on the fibrofelt under the vibration condition, after the fiber felt is completely soaked, the fibrofelt is taken out, and standing is carried out until a fibrofelt-gel complex is obtained; aging treatment is carried out at room temperature or under heating condition; solvent replacement is carried out for multiple times, and excessive moisture in the fibrofelt-gel complex is removed; and dryingtreatment is carried out so as to obtain the high-temperature-resistant thermal-insulation aerogel felt. According to the preparation method, the mechanical strength of the aerogel felt is improved,and meanwhile, the high temperature resistance and the heat insulation effect are good.

Description

technical field [0001] The invention belongs to the field of airgel blankets, and in particular relates to a preparation method of high-temperature-resistant heat-insulating airgel blankets. Background technique [0002] Airgel is a nanoporous material with a porosity as high as 80~99.8%, and its specific surface area can reach 200~1000m 2 / g, the density of airgel is extremely low, it is currently the lightest solid in the world, in addition, airgel also has low thermal conductivity (minimum 0.01W / m K), high porosity (up to 99%) , High light transmittance (up to 99%), low dielectric constant (as low as 1.0~2.0), low refractive index (as low as 1.05), etc. [0003] SiO 2 Compared with other traditional heat insulation materials, airgel felt has unparalleled advantages. It is the solid material with the best performance of heat insulation materials at present, and it is the preferred material for energy saving and consumption reduction, especially in the research of high te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/28C04B38/00C04B14/06C04B14/38
CPCC04B14/064C04B14/383C04B26/285C04B38/0045C04B2201/32C04B2201/50C04B14/024C04B18/027C04B14/42
Inventor 刘喜宗董会娜吴恒姚栋嘉牛利伟张东生
Owner GONG YI VAN-RES INNOVATION COMPOSITE MATERIAL CO LTD
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