Thermal insulation material research and development background

Update:12 Oct 2019

The traditional thermal insulation material is mainly t […]

The traditional thermal insulation material is mainly to increase the gas phase void ratio, reduce the thermal conductivity and the conduction coefficient. Fiber insulation materials must increase the convective heat transfer and radiation heat transfer in the use environment, and must have a thick coating; and the profile inorganic insulation materials should be assembled, there are many seams, damage, beautiful, waterproof Defects such as poor performance and short service life. To this end, people have been seeking and researching a new type of material that can greatly improve the thermal insulation performance of insulation materials.

In the 1990s, a new type of space adiabatic reflective porcelain (Therma-Cover) was developed by NASA researchers to solve the problem of heat transfer control of spacecraft. The material was suspended by some inertia. It is composed of tiny ceramic particles in latex, which has high thermal conductivity, high emissivity, low thermal conductivity, low heat storage coefficient and other thermal properties, and has excellent heat insulation and reflection function. This high-tech material has been promoted and applied abroad by the aerospace industry, used in construction and industrial facilities, and has been exported to China for use in some large industrial facilities.

But the fly in the ointment is that the expensive price of the material of 20 US dollars / kg is really fascinating and unbearable in many industries in China. As a result, the country has quietly set off a wave of research and development of new materials for thermal insulation, and has taken the lead in the development of new space reflection insulation coatings with high efficiency, thin layer, heat insulation, decoration and waterproof. The coating uses a silicone-acrylic emulsion with excellent heat resistance, weather resistance, corrosion resistance and water resistance, and an aqueous fluorocarbon emulsion as a film-forming substance. The ultra-fine hollow ceramic particles, which are known as materials of the space age, are used as fillers. The coating film prepared by multi-arranged arrangement is high in reflection of the solar heat in the visible light and the near-infrared region in the range of 400 to 1800 nm, and the air microporous layer having a very low thermal conductivity is introduced into the coating film to insulate the thermal energy. transfer. By enhancing the significant resistance of the reflected solar heat and convection, the radiation heat transfer and convective heat transfer can be effectively reduced, thereby reducing the heat balance temperature on the surface of the object, and the roof temperature can be lowered by up to 20 ° C, and the indoor temperature can be lowered by 5 to 10 ° C. . The product has an insulation rating of R-33.3, a thermal reflectance of 89%, and a thermal conductivity of 0.030 W/m.K.