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
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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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