Traditional VS new type: aerogels occupy the Pyramid tower point of insulation Market
The global adiabatic market is estimated to be $32.1 billion in 2010, with an annual growth rate of 6.3% in the future, reaching $55.6 billion by 2019, according to a study. The industrial and equipment sector accounts for about 1/3 of the total, while the construction sector accounts for 2/3 of the total. According to the latest survey by Global Market Insight, the market size of building insulation materials is expected to reach $34.9 billion by 2024. As an aerogel that occupies the tip of the Pyramid model of the entire insulation market, how can we win the market with He Lizu?
Insulation materials refer to materials that can block heat flow, also known as thermal insulation materials. On the one hand, insulation materials meet the requirements of building space or thermal equipment for the thermal environment, on the other hand, it also saves energy. Some countries regard insulation materials as the fifth largest energy after coal, oil, natural gas and nuclear energy, which are widely used in various fields of national economy, such as housing construction, industry and agriculture, national defense facilities, equipment manufacturing, environmental engineering, and so on. China is vigorously promoting energy conservation and emission reduction, building energy conservation and noise pollution prevention and control. Now it is the key material and important guarantee for green low carbon development.
According to adiabatic performance, thermal insulation materials can be divided into two categories: traditional thermal insulation materials and new insulation materials.
Traditional insulation materials, such as glass fiber, asbestos, rock wool, slag cotton, silicate, diatomite, expanded vermiculite, expanded perlite, foamed clay, lightweight concrete, microporous calcium silicate, foam glass and ceramic fiber have been playing a pivotal role and widely used in various fields. In the building insulation Market in 2016, mineral wool insulation contributed over 50% of consumption. However, these traditional insulation materials have certain deficiencies in varying degrees.
In order to overcome the shortcomings of the above insulation materials and meet the national requirements for energy conservation and environmental protection, a new type of insulation materials came into being. The new insulation materials include nanoporous insulation materials, vacuum insulation materials, low radiation insulation materials, phase change energy storage materials, transparent insulation materials and so on. Among them, aerogel insulation materials occupy the top part of the Pyramid model of the insulation market.
Where aerogels are based on the Pyramid tower of insulation materials market
Aerogels, also known as xerogels, are only 2.75 times the density of air and are the world's least dense solids. Aerogels can be divided into carbon, silicon, sulfur, metal oxide, and metal systems according to their composition. However, the silicon aerogel silica aerogel is the most developed and applied.
SiO2 aerogel is a new lightweight nanoporous material. It has nano structure (typical pore size is less than 50nm, skeleton particle is 1 to 20nm), large surface area (up to 800 to 1000m2/g), and high porosity (up to 80% ~ 99.8%). In addition, SiO2 aerogels are resistant to high temperature. Generally, the structure and properties of the aerogels are not changed obviously at 800 degrees centigrade. Therefore, SiO2 aerogels have unparalleled advantages as high temperature insulation materials.
Adiabatic mechanism of aerogel insulation materials
(1) convection: when the pore diameter of the aerogel material is less than 70nm, the air molecules in the pores lose the ability of free flow, and are relatively attached to the stomatal wall, when the material is in an approximate vacuum state.
(2) radiation: because the pores in the aerogels are all nano sized pores and the bulk density of the material itself is very low, the number of the inner wall of the aerogel tends to "infinity". It has the function of a heat shield for each stomatal wall, thus producing an effect close to the "infinite heat shield", thus reducing the radiation heat transfer. Near the lowest limit.
(3) Heat conduction: due to the existence of nearly infinite number of nano-holes, heat flow can only be transmitted along the pore wall in solids. Nearly infinite number of pore walls form a near-infinite road force effect, which makes the ability of heat conduction of solids drop to the lowest limit.
Compared with traditional insulation materials, nano porous SiO2 aerogel insulation material can achieve the equivalent thermal insulation effect with lighter weight and smaller volume. It has good thermal stability, heat shock resistance and thermal insulation, can replace the traditional mineral wool, so that the house is both thermal insulation and thermal insulation. If it is used in high-rise buildings, it can replace the general curtain wall glass, greatly reducing the weight of buildings, and can play a role in fire prevention. In addition, the use of SiO2 aerogel insulation composites in pipes, furnaces and other thermal equipment can replace the traditional thermal insulation materials, thus greatly reducing the heat loss. The nano porous super insulating material SiO2 aerogel is applied to the storage tank, pipeline and collector of the solar water heater. The collector efficiency can be increased by more than 1 times, and the heat loss will be reduced to less than 30% of the existing level. Moreover, it can keep non-powder, non-embrittlement and non-aging before and after use; does not support the growth of mold, and the comprehensive performance remains unchanged for a long time; and has a long service life, which can be the same as the building.
Stabilizing the insulation Market in Pyramid, reducing costs is the key.
In 1931, aerogel was first prepared by hydrolyzed sodium silicate in Stanford University, Kistler. But it was not until around 2013 that the industry was developed, and now the United States and China are leading. Aerogel materials occupy the top part of the Pyramid model of the whole thermal insulation market, but the scale of the insulation market is almost negligible at present. This indicates that the aerogel industry is still in the early stage of development, and at the same time, it also indicates its great development space in the future.
According to research and analysis, high price, long preparation cycle and corrosive characteristics become the bottleneck of aerogel development at home and abroad, which has been restricting the application prospect of aerogels. Therefore, if the aerogel is to stabilize the Pyramid tower of the insulation market, it is necessary to simplify the preparation process of SiO2 aerogels, shorten the time, reduce the cost, and obtain modified SiO2 aerogels which can meet all kinds of complex environments. At that time, SiO2 aerogels will receive more and more attention in the field of civil and aviation due to its superior thermal insulation performance, and gradually replace traditional insulation materials.