New energy-saving construction materials – glass airgel, various glasses may be substituted.
Airgel airgel glass is a new building material as the main material, various glasses may be used instead. Two pieces of glass, sandwiching fill airgel, such a \”sandwich\” is an airgel glass. It is a new product based on hollow glass and hollow glass above. Since the airgel having both heat insulating properties, but also has sound absorption characteristics, and has a light-transmissive, and therefore the effect of airgel insulation glass is several times higher than conventional double glazing, and has a noise reduction effect.
There are many advantages airgel glass is nowhere near ordinary glass:
The thermal stability and thermal shock resistance than quartz glass, even in a high temperature state 1300 ℃ it into the water, and do not break; its specific gravity is small, only 0.07-0.25g / cm3, a few tenths of ordinary glass; it has better thermal insulation than the mineral wool properties; it does not burn, a good fire material; also has good sound insulation performance, higher than the average four times more than the metal and glass, the glass is intermediate airgel airgel. The earliest airgel is separated out from the silica gel. Of course, also be obtained from other materials. For example, from alumina, tungsten oxide, iron oxide, zinc oxide, tin oxide, cellulose, nitrocellulose, animal gelatin, agar, protein, gums are obtained airgel.first developed in 1977 by the European Center for Nuclear Research in Geneva. Later, Sweden Lujiesike universities have started to develop. airgel glass available in modern technology and high-tech areas are widely used: as used in aerospace, marine peep window; instead of tempered glass car; in the field of laser and atomic energy as a structural material through a variety of rays and optical elements made of precision optical instruments. In short, it can replace ordinary glass, plexiglass, plastic and other areas can flourish in these three materials competent. Although similar in appearance ordinary glass, transparency and dyeing. was prepared in two steps airgel glass. First, a gel silanol from silane; and the silanol gel into the mold and drying, the solvents were removed from the gel so that the entire process was carried out at a pressure and temperature, it can be computer controlled throughout the manufacturing process . In 1983, Sweden had airgel glass production enterprises, the main production equipment is the height of 5 meters, diameter of 1 meter pressure cooker. It is used in construction, makeHousing both heat and warm; if used in high-rise buildings, can replace the glass curtain wall in general, greatly reduce the weight of buildings and play a role in fire prevention. Practice has proved that a layer of airgel glass sandwiched between two layers of common glass, the heat transfer coefficient decreased from 3W / m2.K to 0.5W / m2.K. In addition, airgel glass are slower than the propagation speed of sound of all the inorganic material. Speed of sound in air is 340m / s, the propagation velocity in water of 1400-1500m / s, and the velocity of propagation in metals is from ordinary glass 500m / s, but merely airgel glass 100-120m / s.
The main technical parameters are as follows airgel glass.
Density: 0.07-0.25g / cm3; leads coefficient: 0.021W / m2. K; refractive index: 1.015-1.055; pore size: of 10-20 nm; sound propagation speed: 120m / s; acoustic resistance: 105 × 104kg / m2.s; heat resistance: 1300 deg.] C; silica content: 99.99%. Although airgel glass has many excellent physical properties, but the price is relatively high, only up to the smaller geometry (20-60) × (20-60) × (2-3) cm, it limits the scope of use. But with advances in science and technology, it will have broad prospects for development.