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A kind of preparation method of anti-powder falling airgel felt

An aerogel felt and powder gas technology, which is applied in the field of thermal insulation materials, can solve the problems of reducing thermal insulation performance, solvent penetration, environmental pollution, etc., and achieves the effect of preventing powder drop.

Active Publication Date: 2022-04-08
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

Solvent-based coatings are usually applied on the surface of airgel to prevent slag, but solvent-based coatings will cause environmental pollution, and will cause solvents to penetrate into the interior of the airgel, destroying the pore structure and reducing its thermal insulation performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A preparation method of an anti-powder shedding airgel felt, the steps are as follows:

[0023] (1) Mix ethyl orthosilicate, absolute ethanol and water evenly, then add 2 mol / L NH 4 F solution and 0.2 mol / L ammonia water were stirred evenly to obtain silica sol; wherein, in terms of molar ratio, tetraethyl orthosilicate: absolute ethanol: water = 1: 12: 4; NH 4 The amount of F solution added is guaranteed in molar ratio, NH 4 F: tetraethyl orthosilicate=0.008:1; 3 : tetraethyl orthosilicate = 0.01: 1;

[0024] (2) After immersing the glass fiber mat in the silica sol obtained in step (1) for 20 h, static aging at 40 °C for 12 h;

[0025] (3) Place the glass fiber mat obtained in step (2) in the modification solution for hydrophobic modification treatment for 20 h, the modification solution is a mixture of modifier and absolute ethanol in a molar ratio of 1:5 , the modifying agent is hexamethyldisiloxane; after the hydrophobic modification treatment is completed, the...

Embodiment 2

[0030] A preparation method of an anti-powder shedding airgel felt, the steps are as follows:

[0031] (1) Mix ethyl orthosilicate, absolute ethanol and water evenly, then add 2 mol / L NH 4 F solution and 0.2 mol / L ammonia water were stirred evenly to obtain silica sol; wherein, in terms of molar ratio, tetraethyl orthosilicate: absolute ethanol: water = 1: 10: 3; NH 4 The amount of F solution added is guaranteed in molar ratio, NH 4 F: tetraethyl orthosilicate=0.01:1; 3 : ethyl orthosilicate = 0.008: 1;

[0032] (2) After immersing the glass fiber mat in the silica sol obtained in step (1) for 24 h, it was aged at 60 °C for 20 h;

[0033] (3) Place the glass fiber mat obtained in step (2) in the modification solution for hydrophobic modification treatment for 24 hours, the modification solution is a mixture of modifier and absolute ethanol in a molar ratio of 1:4 , the modifying agent is hexamethyldisiloxane; after the hydrophobic modification treatment is completed, the s...

Embodiment 3

[0038] A preparation method of an anti-powder shedding airgel felt, the steps are as follows:

[0039] (1) Mix ethyl orthosilicate, absolute ethanol and water evenly, then add 2 mol / L NH 4 F solution and 0.2 mol / L ammonia water were stirred evenly to obtain silica sol; wherein, in terms of molar ratio, tetraethyl orthosilicate: absolute ethanol: water = 1:8:3; NH 4 The amount of F solution added is guaranteed in molar ratio, NH 4 F: tetraethyl orthosilicate = 0.006: 1; 3 : ethyl orthosilicate = 0.012: 1;

[0040] (2) After immersing the glass fiber mat in the silica sol obtained in step (1) for 24 h, it was aged at 50 °C for 24 h;

[0041] (3) Place the glass fiber mat obtained in step (2) in the modification solution for hydrophobic modification treatment for 18 hours, the modification solution is a mixture of modifier and absolute ethanol in a molar ratio of 1:3 , the modifying agent is trimethylchlorosilane; after the hydrophobic modification treatment is completed, the...

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PUM

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Abstract

The invention belongs to the field of thermal insulation materials, and discloses a preparation method of aerogel felt for preventing powder drop. Take orthosilicate, ethanol and water and mix well, then add NH in turn 4 The F solution and ammonia water are stirred evenly to obtain a silica sol; after immersing the fiber mat in the silica sol, it is statically aged, and subjected to hydrophobic modification treatment. Silicon aerogel felt; purge the silica aerogel felt, and irradiate the front and back sides of the silica aerogel felt; spray the water-based adhesive evenly on the surface of the silica aerogel felt. Front and back sides, dry, that is, powder-proof aerogel felt. The present invention adopts the method of irradiating the surface of the silica aerogel felt with electron beams, so that the surface of the silica aerogel felt is made hydrophilic, thereby facilitating the spreading of the water-based adhesive on the surface of the silica aerogel felt , thereby preventing the occurrence of powder drop.

Description

technical field [0001] The invention belongs to the field of thermal insulation materials, and in particular relates to a preparation method of an anti-powder shedding airgel felt. Background technique [0002] At present, the development of new energy, the improvement of the utilization rate of existing energy and the conservation of energy have attracted great attention from all countries. my country is an energy-poor country, therefore, rational use of energy and energy conservation are of great significance to the sustainable development of our society. Adopting new technologies and processes to develop environmentally friendly heat insulation materials is one of the most effective and economical measures to save energy. [0003] SiO 2 As an emerging super heat insulation material, airgel has an extremely low thermal conductivity, which is far lower than the thermal conductivity of 0.25W / m K of static air at room temperature, and has an incomparable heat insulation eff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B30/02C04B38/00C04B41/63
CPCC04B30/02C04B41/483C04B41/63C04B14/064C04B14/42C04B38/0045C04B41/4539
Inventor 刘喜宗杨红霞董会娜姚栋嘉张东生牛利伟
Owner GONG YI VAN-RES INNOVATION COMPOSITE MATERIAL CO LTD
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