It is believed that everyone has a certain understanding of aerogel thermal insulation materials. In recent years, aerogel thermal insulation materials have been used more and more widely. Aerogel thermal insulation materials have many advantages in the use process, such as stable chemical properties, superior thermal insulation properties, good mechanical properties, sound insulation and shock absorption properties. It is a new type of environmental protection, health and high-tech materials. Then, let's introduce the characteristics of air gel insulation materials and air gel insulation materials.
Whether the air gel thermal insulation material is good
Aerogel thermal insulation material is a solid material form, which has the smallest density in the world. The density is 3 kilograms per cubic meter. The common aerogel is silicon aerogel gel, which was first made by American scientist Kistler in 1931 for gambling with his friends. There are many kinds of aerogels, including silicon, carbon, sulfur, metal oxide, metal and so on. Aerogel is a compound word. Here aero is an adjective, which means flying. Gel is obviously gel. It literally means a flying gel. The gel of any substance can be called aerogel as long as it can be dried to remove the internal solvent and keep its shape basically unchanged, and the product has high porosity and low density.
In terms of thermal insulation materials, the fine nano network structure of silica aerogel effectively limits the propagation of local thermal excitation, and its solid thermal conductivity is 2-3 orders of magnitude lower than the corresponding glassy materials. Nano micropores suppress the contribution of gas molecules to thermal conduction. The refractive index of silicon aerogel is close to l, and the ratio of the annihilation coefficient of infrared and visible light is more than 100. It can effectively pass through the sunlight and prevent the infrared thermal radiation of the ambient temperature. It has become an ideal transparent thermal insulation material, and has been applied in solar energy utilization and building energy conservation. By means of doping, the radiant heat conduction of silicon aerogel can be further reduced. The thermal conductivity of carbon doped aerogel can be as low as 0.013w/m · K at room temperature and pressure. It is the solid material with the lowest thermal conductivity at present, and is expected to replace polyurethane foam as a new type of refrigerator insulation material. Adding titanium dioxide can make silica aerogel become a new type of high temperature thermal insulation material, and the thermal conductivity at 800K is only 0.03w/m · K, which will be further developed as a new supporting material for military products.
Characteristics of aerogel thermal insulation material
1. Elastic
It is a little elastic, and the touch is very soft and comfortable. There are large and small graphene aerogels, which are like tennis balls. The smallest can plug the holes of wine bottles. It is gray and cute. This graphene aerogels, called carbon sponges, can be compressed to any degree, and can be restored to its original shape as quickly as possible because of its special elasticity.
2. Oil absorption
Aerogel has extremely strong adsorption capacity, especially for organic solvents, and is currently the most oil absorbing material in the world. At present, there are some oil absorption products on the market, but compared with graphene aerogel, it is only one tenth of that. This graphene aerogel material can absorb about 250 times of the oil absorption products sold on the market, and it is only oil absorption. It has no absorption capacity for water.
3. Energy storage insulation
Another feature of aerogel is that it can be used as thermal insulation material for our commonly used thermal insulation cups, thermos bottles and other products. It is an extremely ideal thermal insulation energy storage product with great market prospects. Maybe it is not popular now. Many consumers do not know that such an excellent material exists, but the graphene aerogel developed by us has a good thermal insulation effect after many tests.