POROUS SiO2 xerogels with a characteristic size of the ERP, stable in drying a precursor for its preparation and its Application

摘要

1. The porous xerogel SiO₂, Otlichayuschiysyatem that it contains pores that are larger than 50 nm and less than 1000 nm, in particular - is less than 500 nm, in particular - is less than 300 nm, in particular - is less than 100 nm, has a density less than 400 kg / m³In particular - less than 290 kg / m³In particular - of less than 200 kg / m³Contains a carbon fraction that is less than 10%, in particular - less than 5% and has a thermal conductivity at 800 ° C is less than 0.060 W / m · K at 400 ° C - is less than 0.040 W / m · K at 200 ° C - less than 0.030 W / mK.;2. xerogel SiO₂ according to claim 1, characterized in that it has a modulus of at least 5 MPa.;3. xerogel SiO₂ according to claim 1, otlichayuschiysyatem that it at temperatures up to 560 ° C (in an atmosphere containing oxygen) has a long thermal stability.;4. xerogel SiO₂ according to claim 1, otlichayuschiysyatem that it has an extinction coefficient for infrared radiation than 50 m²/ G in the absence of other pigments.;5. SiO xerogel₂ according to claim 1, otlichayuschiysyatem that it has an extinction coefficient for infrared radiation than 80 m²/ G in the presence of other pigments.;6. xerogel SiO₂ according to claim 1, otlichayuschiysyatem that it is a monolithic molded product, powder or granules.;7. xerogel SiO₂ according to claim 1, characterized in that the proportion of fiber in it less than 5 wt.%.;8. The use of SiO xerogel₂ according to any one of claims 1-7 as a non-flammable or nonflammable, transparent or translucent or opaque heat-insulating material, as insulating material of the carrier, a catalyst carrier, a filter, an absorber or flammable retardant, transparent, translucent or opaque lightweight building material for dielectric electronic components, as a system for the controlled and rapid release of drugs, as a coating for use in thermal diffusion process, as a mold, as a carrier for sensor molecules in sensor technology, for insulation, for moisture control, or as a base material for composite materials.