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Fiber composite aerogel material as well as preparation method and application thereof

A fiber composite, aerogel technology, used in climate change adaptation, chemical instruments and methods, silicon compounds, etc., can solve the problem of poor mechanical properties of silica aerogel materials Difficult to apply and other problems, to achieve the effect of improving thermal insulation performance, flexibility without powder loss, and enhancing mechanical properties

Inactive Publication Date: 2021-04-16
CHINA NUCLEAR POWER TECH RES INST CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Silica airgel materials have poor mechanical properties and are brittle, making it difficult to directly apply them in practical engineering.
The nanofibers prepared by this method contain more organic components, and the organic components will be oxidized and decomposed at high temperature, thereby reducing the mechanical and thermal insulation properties of the material

Method used

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  • Fiber composite aerogel material as well as preparation method and application thereof
  • Fiber composite aerogel material as well as preparation method and application thereof
  • Fiber composite aerogel material as well as preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0032] see figure 1 , the preparation method of the fiber composite airgel material of an embodiment, comprises the steps:

[0033] Step S110: hydrolyzing part of the silicon source to prepare a silicon hydrolyzate, mixing the silicon hydrolyzate with a polymer, and performing electrospinning to prepare a nanofiber membrane.

[0034] Wherein, the silicon source is ethyl orthosilicate, methyl orthosilicate or butyl orthosilicate.

[0035] The step of hydrolyzing part of the silicon source includes: mixing part of the silicon source and water in a molar ratio of 1:(2-10), then adjusting the pH to 2-5, and stirring for 1h-10h. Preferably, in the step of adjusting the pH to 2-5, hydrochloric acid is added to adjust the pH. It can be understood that in the step of adjusting the pH to 2-5, other acidic reagents may also be added to adjust the pH.

[0036] Specifically, in the step of mixing the silicon hydrolyzate with the polymer, the silicon hydrolyzate is mixed with the polyme...

Embodiment 1

[0073] The preparation process of the fiber composite airgel material of the present embodiment is as follows:

[0074] (1) After uniformly mixing tetraethyl orthosilicate with deionized water (molar ratio 1:8), adjust the pH to 3 with hydrochloric acid, and mix it with PVA solution (mass percent concentration: 10%) at a ratio of 1:1 after stirring for 12 hours. The mass ratio is evenly mixed, and then the mixed solution is electrospun to prepare a nanofiber membrane. The process parameters during the spinning process are: voltage 10kV, receiving distance 12cm, and injection flow rate 2mL / h.

[0075] (2) Heat the nanofiber membrane prepared in step (1) at 700° C. for 1.5 h in a vacuum environment to prepare a high temperature resistant nanofiber membrane.

[0076] (3) Ethyl orthosilicate, ethanol and water (molar ratio 1:10:5) were uniformly mixed, the pH was adjusted to 3 by hydrochloric acid, and the pH was adjusted to 7 with ammonia water after continuing to stir slowly for...

Embodiment 2

[0080] The preparation process of the fiber composite airgel material of the present embodiment is as follows:

[0081] (1) After uniformly mixing tetraethyl orthosilicate with deionized water (molar ratio 1:8), adjust the pH to 3 with hydrochloric acid, and mix it with PVA solution (mass percent concentration: 10%) at a ratio of 1:1 after stirring for 12 hours. The mass ratio is evenly mixed, and then the mixed solution is electrospun to prepare a nanofiber membrane. The process parameters during the spinning process are: voltage 10kV, receiving distance 12cm, and injection flow rate 2mL / h.

[0082] (2) Heat the nanofiber membrane prepared in step (1) at 700° C. for 1 hour in a vacuum environment to prepare a high temperature resistant nanofiber membrane.

[0083](3) Mix 10mL orthosilicate ethyl ester (9.3g, 0.045mol) and 40mL (31.56g, 0.685mol) ethanol uniformly to form solution A, and 4.5mL (4.5g, 0.25mol) (orthosilicate ethyl ester, The molar ratio of ethanol and water is...

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Abstract

The invention relates to a fiber composite aerogel material as well as a preparation method and application thereof. The preparation method of the fiber composite aerogel material comprises the following steps: hydrolyzing part of a silicon source to prepare a silicon hydrolysate, mixing the silicon hydrolysate with a polymer, and carrying out electrostatic spinning to prepare a nanofiber membrane; thermally treating the nanofiber membrane to remove the polymer; mixing the remaining silicon source with water and an alcohol solvent to prepare silica sol; soaking the nanofiber membrane subjected to heat treatment in silica sol, and mixing under a negative pressure condition to prepare nanofiber sol; and carrying out gel aging treatment on the nanofiber sol, and then drying to prepare the fiber composite aerogel material. According to the preparation method of the fiber composite aerogel material, the thermal insulation property and the flexibility of the fiber composite aerogel material can be improved at the same time, and powder does not fall off.

Description

technical field [0001] The invention relates to the field of airgel materials, in particular to a fiber composite airgel material and its preparation method and application. Background technique [0002] Silica airgel materials have poor mechanical properties and are brittle, making it difficult to be directly applied in practical engineering. Combining airgel materials with fibers is currently the main modification method to improve the mechanical properties of silica airgel. However, the commonly used modified fibers have a large heat conduction effect, which greatly reduces the heat insulation performance of airgel materials. [0003] The traditional technology discloses a method for preparing high-efficiency airgel fiber mats by using fiber mats to combine with airgel through siphon action. By selecting fiber mats with specific density and diameter to ensure the processing performance and heat insulation performance of the material, and through siphon The function enha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B30/02
CPCC04B30/02C01B33/158
Inventor 林继铭赵园仇若翔魏欢怡曾献邹青段承杰
Owner CHINA NUCLEAR POWER TECH RES INST CO LTD
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