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Method for discontinuously producing aerogel felt

An airgel felt, a non-continuous technology, applied in the field of airgel felt preparation, can solve the problems of uneven dipping, insufficient dipping, long preparation cycle, etc.

Active Publication Date: 2022-01-07
GONG YI VAN-RES INNOVATION COMPOSITE MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for non-continuous production of airgel, which is used to solve the technical problems of uneven dipping, insufficient dipping, and long preparation period in the current airgel felt

Method used

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  • Method for discontinuously producing aerogel felt
  • Method for discontinuously producing aerogel felt
  • Method for discontinuously producing aerogel felt

Examples

Experimental program
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Effect test

Embodiment 1

[0043] The invention provides a method for non-continuous production of airgel mats, such as Figure 1-2 shown, including:

[0044] 1) Unwind the fiber roll mat 1-1, the fibers are ceramic fibers, and several guide pipes 2 are evenly laid in the width direction of the unfolded fiber mat, and the guide pipes 2 are evenly provided with several glue injection holes 2 -1, the guide tube 2 is rolled together with the fiber felt, and the rolled fiber roll mat 1-1 has a guide tube 2 between the layers, and then placed in the dipping tank.

[0045] 2) Take tetraethoxysilane, ethanol, and water and mix evenly, wherein, in terms of molar ratio, tetraethoxysilane:ethanol:water=1:3:6; add sulfuric acid, adjust the pH value to 4, and stir evenly. Obtain silica sol; inject the silica sol between the fiber roll mats 1-1 through the glue injection hole 2-1 of the draft tube 2, impregnate the ceramic fiber mats in the silica sol, and pass the Add alkaline catalyst ammonia to the glue injecti...

Embodiment 2

[0050] A method for non-continuous production of airgel mats, comprising:

[0051] 1) Unwind the fiber roll mat 1-1, the fibers are pre-oxidized silk fibers, and several guide pipes 2 are evenly laid in the width direction of the unfolded fiber mat, and the guide pipes 2 are evenly equipped with several glue injection The hole 2-1, the guide tube 2 and the fiber mat are rewound together, and the rewound fiber roll mat 1-1 has a guide tube 2 between the layers, and then placed in the dipping tank.

[0052] 2) Mix tetraethoxysilane, ethanol, and water evenly, wherein, in terms of molar ratio, tetraethoxysilane:ethanol:water=1:4:5; then add ammonium fluoride solution and ammonia water and stir evenly, Ammonium fluoride and tetraethoxysilane are calculated by molar ratio, ammonium fluoride: tetraethoxysilane = 0.002: 1, the amount of ammonia water added is based on the molar ratio, ammonia water: tetraethoxysilane = 0.005: 1, and The catalyzed silica sol is pumped into the cataly...

Embodiment 3

[0056] A method for non-continuous production of airgel mats, comprising:

[0057] 1) Unwind the fiber roll mat 1-1, the fibers are glass fibers, and several guide pipes 2 are evenly laid in the width direction of the unfolded fiber mat, and the guide pipes 2 are uniformly provided with several glue injection holes 2 -1, the guide tube 2 is rolled together with the fiber felt, and the rolled fiber roll mat 1-1 has a guide tube 2 between the layers, and then placed in the dipping tank.

[0058] 2) Preparation of wet gel felt combined with silica wet gel: Mix tetraethoxysilane, ethanol, and water evenly, wherein, in terms of molar ratio, tetraethoxysilane:ethanol:water=1:3 : 6; then add ammonium fluoride solution and ammonia water and stir evenly. Ammonium fluoride and tetraethoxysilane are calculated by molar ratio. Calculated, ammonia water: tetraethoxysilane = 0.015: 1, to obtain the catalyzed silica sol, impregnate the glass fiber mat in the catalyzed silica sol and let it ...

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Abstract

The invention relates to a preparation method of an aerogel felt. The method comprises the following steps: laying flow guide pipes between layers of fiber roll felts or fiber sheet felts, arranging a plurality of gel injection holes in the flow guide pipe, pumping catalyzed silicon dioxide sol through the flow guide pipe or sequentially pumping the silicon dioxide sol and a gel catalyst through the flow guide pipe, dipping the fiber felt in the catalyzed silicon dioxide sol or the silicon dioxide sol and a gel catalyst to form a wet gel felt, and then drying the wet gel felt to obtain the aerogel felt. The flow guide pipes are evenly laid in the fiber roll felt or between the stacked fiber sheet felts, the glue injection holes are evenly distributed in the flow guide pipes, sol is evenly injected between the fiber felts through the glue injection holes, and the two faces of the fiber felt body can be impregnated, so that the problem that in the discontinuous production process, impregnation is not uniform due to spraying single-face impregnation is avoided; the fiber felt body is evenly impregnated, and the prepared aerogel felt is uniform and stable in performance; and the fiber felt body is fully impregnated, and the prepared aerogel felt is low in heat conductivity coefficient.

Description

technical field [0001] The invention relates to a preparation method of an airgel felt, in particular to an airgel felt produced by discontinuous dipping and a production method thereof. Background technique [0002] Silica airgel is a continuous three-dimensional network structure formed by the aggregation of nanoscale particles. Because of its special nanoscale micropores and skeleton structure, its thermal conductivity efficiency, convective heat transfer efficiency and radiation heat transfer efficiency All have been effectively restricted, so airgel has a very low thermal conductivity, which is currently the solid material with the lowest thermal conductivity in the world. [0003] Generally, aerogels are obtained by preparing hydrogels from silica precursors such as water glass or tetraethylorthosilicate (TEOS) and removing the liquid components in the hydrogels without destroying the microstructure. Silica aerogels include three conventional forms: powder, granule an...

Claims

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Application Information

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IPC IPC(8): C04B30/02C04B38/00C04B14/06
CPCC04B30/02C04B38/0045C04B2201/32C04B14/064C04B14/46C04B16/06C04B14/42
Inventor 张东生董会娜张继承王琰姚栋嘉吴恒刘喜宗赵严
Owner GONG YI VAN-RES INNOVATION COMPOSITE MATERIAL CO LTD
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