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Preparation method of silica aerogel and glass fiber mat composite material

A technology of glass fiber mat and silica, which is applied in the field of preparation of silica airgel and glass fiber mat composite materials, can solve the problems of non-gelation of composite materials, influence of catalytic effect, and influence on the final performance of composite materials, etc. Achieve the effect of improving production efficiency

Active Publication Date: 2016-08-03
航天海鹰(镇江)特种材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the large-scale industrial production process of silica airgel and glass fiber mat composite materials, the sol-gel process of the composite material is easy to dissolve the surfactant in the glass fiber mat precursor, and the sol-gel process of the composite material The process generally adopts a one-step catalytic system or an acid-base two-step catalytic system. The dissolution of the surfactant will affect the catalytic effect, resulting in local non-gelation of the composite material and affecting the final performance of the composite material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] First, place 45m long, 1.5m wide, and 10mm thick glass fiber needle felt in a suitable container in the form of tiles, and take 100kg of tetraethyl orthosilicate, ethanol, water, and 0.5mol / L sulfuric acid solution respectively. , 226kg, 34.2kg, and 500g were added to a stainless steel mixing tank and mixed evenly. After stirring for 2 hours, 1.5kg of 0.2mol / L ammonium fluoride solution was slowly added dropwise, and after stirring for 10-20 minutes, the sol was injected into the glass fiber needle felt In a container, seal it and let it stand for 24 hours until it gels. After gelation, put the wet gel into rolls and put it in absolute ethanol for aging for 24 hours. Sexual liquid, modified for 36h. After the modification, the wet gel is taken out, dried by a supercritical fluid, and a composite material of silica airgel and glass fiber mat is obtained.

[0017] The prepared silica airgel and glass fiber mat composite material has a porosity of 90%, a density of 220kg...

Embodiment 2

[0019] First, place 120m long, 1.5m wide, and 1mm thick glass fiber surface mats in a roll form in a suitable container, and place a release cloth between the glass fiber surface mat layers and layers, and take tetraethyl orthosilicate , ethanol, water, and 0.5mol / L sulfuric acid solution were 50kg, 120kg, 17.1kg, and 250g respectively, and were added into a stainless steel stirring tank and mixed evenly. After stirring for 2 hours, 0.75kg of 0.2mol / L ammonium fluoride solution was slowly added dropwise, and then stirred for 10~ After 20 minutes, inject the sol into a container placed in a roll of glass fiber mat, seal it and let it stand for 24 hours until it gels. After gelation, put the wet gel into rolls and put it in absolute ethanol for aging for 36 hours. Sexual liquid, modified for 24h. After the modification, the wet gel is taken out, dried by a supercritical fluid, and a composite material of silica airgel and glass fiber mat is obtained.

[0020] The prepared sili...

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PUM

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Abstract

The invention discloses a preparation method of a silica aerogel and glass fiber mat composite material. The preparation method comprises the following steps: glass fiber mat is placed in rolls or in a tiled form into an appropriate container; a novel ''two-step catalytic method'' of acid-catalytic hydrolysis and fluorinion catalytic condensation is adopted during sol-gel process of silica aerogel; the prepared sol-gel precursor solution is injected into the well-laid glass fiber mat, air in the glass fiber mat is exhausted, and gaps in the glass fiber mat are filled with the sol-gel precursor solution; the sol-gel precursor solution is gelated in the gaps of the glass fiber mat so as to obtain a glass fiber met-gel composite material, and the gelated glass fiber mat composite material is rolled-up again; and the rolled-up glass fiber mat and silica aerogel composite material is modified in an ethanol solution of hexamethyl-disilazane, and the gel composite material undergoes supercritical fluid drying to obtain the silica aerogel and glass fiber mat composite material.

Description

technical field [0001] The invention belongs to the field of airgel materials, and in particular relates to a preparation method of a silica airgel and glass fiber felt composite material. Background technique [0002] Silica aerogels have high specific surface area (~1000m 2 / g), nanoscale holes (~20nm), low density (0.003~0.15g / cm3) and other special microstructures, all exhibit unique properties in thermal, optical, electrical, acoustic and other aspects. Among them, in terms of heat, the nanoporous structure of airgel can effectively inhibit solid-state heat conduction and gas heat transfer, has excellent thermal insulation properties, and is currently recognized as the solid material with the lowest thermal conductivity (0.01~0.03W / (m · K)). [0003] At the same time, silica airgel also has a high service temperature, and even at a high temperature of 900 ° C, it still has a good porous network structure. Therefore, compared with traditional thermal insulation materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B30/02
Inventor 黄铌吴锦源许斌秦德勇刘天时华文龙崔恒律
Owner 航天海鹰(镇江)特种材料有限公司
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