Preparation and Classification of Dry Aerogel Particles
Aerogel Particles, English aerogel, also known as xerogel. When the gel is stripped of most of the solvent, the content of the liquid in the gel is much less than the solid content, or the medium filled in the spatial network of the gel is a gas which is solid in appearance, which is the xerogel and Called Aerogel Particles. China Insulation --Tradematt talk about the classification of Aerogel Particles and SiO2 Aerogel Particles preparation.
Aerogel Particles can be divided into single-component Aerogel Particles, such as SiO2, Al2O3, TiO2, carbon Aerogel Particles (carbonized by organic Aerogel Particles) Al2O3, SiO2 / TiO2 and the like. The most typical and most studied aerogels are the one-component SiO2 aerogels and the aerogels (organic aerogels).
At present, the preparation methods of SiO2 Aerogel Particles mainly include two modes of supercritical drying and atmospheric drying.
1, supercritical drying
The properties of SiO2 aerogels prepared by supercritical method are superior, but the equipment is complex and expensive, the drying process consumes high energy and is dangerous.
2, atmospheric drying
Atmospheric pressure drying preparation of SiO2 aerogels without a large number of equipment, operability, safety and environmental protection, for the large-scale industrial production of SiO2 Aerogel Particles possible; but currently reported atmospheric preparation process cumbersome water glass as a precursor As an example, the order of sequence involves ion exchange, sol-gel process, surface hydrophobic modification, multi-gradient solvent replacement and drying process. The production preparation period takes a long time, and a large amount of solvent is consumed in the production, and a plurality of solvents are mixed and recovered Difficult to separate, increasing the cost of the product, thus limiting the commercial large-scale Aerogel Particles preparation and wide application.
Click http://www.silicaaerogelinsulation.com/ for more aerogel information !!!
Aerogel Particles can be divided into single-component Aerogel Particles, such as SiO2, Al2O3, TiO2, carbon Aerogel Particles (carbonized by organic Aerogel Particles) Al2O3, SiO2 / TiO2 and the like. The most typical and most studied aerogels are the one-component SiO2 aerogels and the aerogels (organic aerogels).
At present, the preparation methods of SiO2 Aerogel Particles mainly include two modes of supercritical drying and atmospheric drying.
1, supercritical drying
The properties of SiO2 aerogels prepared by supercritical method are superior, but the equipment is complex and expensive, the drying process consumes high energy and is dangerous.
2, atmospheric drying
Atmospheric pressure drying preparation of SiO2 aerogels without a large number of equipment, operability, safety and environmental protection, for the large-scale industrial production of SiO2 Aerogel Particles possible; but currently reported atmospheric preparation process cumbersome water glass as a precursor As an example, the order of sequence involves ion exchange, sol-gel process, surface hydrophobic modification, multi-gradient solvent replacement and drying process. The production preparation period takes a long time, and a large amount of solvent is consumed in the production, and a plurality of solvents are mixed and recovered Difficult to separate, increasing the cost of the product, thus limiting the commercial large-scale Aerogel Particles preparation and wide application.
Click http://www.silicaaerogelinsulation.com/ for more aerogel information !!!
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