Research and development background: The traditional thermal insulation material is mainly to improve the gas 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 layer (Therma-Cover) was developed by NASA researchers to solve the problem of heat transfer control of spacecraft. The material is suspended by some inertia. It is composed of tiny ceramic particles in latex, which has high thermal conductivity, high emissivity, low thermal conductivity, low thermal conductivity 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 really makes many domestic industries look good and unbearable. As a result, the country has quietly set off a wave of research and development of new materials for thermal insulation, and Beijing Guobang Technology Development Center has taken the lead in developing a new type of space reflection with high efficiency, thin layer, heat insulation, decoration and waterproof in the domestic counterparts. Thermal insulation coating.
The coating uses a silicone-acrylic emulsion and an aqueous fluorocarbon emulsion with excellent heat resistance, weather resistance, corrosion resistance and water resistance as a film-forming substance, and uses a very fine hollow ceramic particle known as a space-age material as a filler. The coating film prepared by multi-arrangement of particles is arranged to reflect high the solar heat in the visible light and the near-infrared region in the range of 400 to 1800 nm, and at the same time, 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 a thermal insulation rating of R-33.3, a thermal reflectance of 89%, and a thermal conductivity of 0.030 W/mK.
Trends: Building insulation is an important aspect of saving energy, improving the living environment and using functions. Building energy consumption accounts for 30-40% of the total energy consumption of human beings. Most of them are energy consumption for heating and air conditioning, so building energy conservation is of great significance. Moreover, since the thermal insulation coating uses water as a dilution medium and does not contain volatile organic solvents, it is harmless to the human body and the environment; its production cost is only about one-fifth that of similar foreign products, and it is used as a new type of thermal insulation. Coatings, with good economic benefits, energy saving and environmental protection, heat insulation effect and simple construction, have attracted more and more people's attention and favor.
And this space adiabatic reflective coating is undergoing a transition from industrial thermal insulation to building thermal insulation, from thick layer to thin layer thermal insulation technology, which is also the main insulation material in the future. One of the development directions. The space reflection insulation coating constructs an effective thermal barrier by applying a vacuum cavity layer formed by the ceramic spherical particle hollow material in the coating, which not only has large thermal resistance, low thermal conductivity, but also high heat reflectivity, reducing the building to the sun. The absorption of radiant heat reduces the temperature of the coated surface and the internal space, so it is recognized by experts as one of the most promising energy-efficient materials.
Today, global thermal insulation materials are developing in the direction of high efficiency, energy saving, thin layer, heat insulation and waterproof external protection. In the development of new thermal insulation materials and in line with structural insulation and energy saving technology, more emphasis is placed on the use of targeted insulation. Insulation materials, designed and constructed according to standard specifications, strive to improve insulation efficiency and reduce costs. In recent years, research on thin-layer thermal insulation coatings has been carried out at home and abroad. Many companies in the United States have produced such thermal insulation coatings, such as SPM Thermo-Shield in the United States, Ceramic-Cover from Thermal Protective Systems, and Therma from JH International. -Cover and other products.
This space-insulated porcelain layer is developed according to the working principle of NASA's control of space shuttle heat conduction by NASA. It is suitable for high-pressure spraying, pollution-free, with good heat radiation resistance, thin layer heat insulation and waterproof protection. Corrosion and other properties. The material has now turned to general industrial and civil insulation. There are also many companies in China that are developing such materials, such as thin-layer heat-reflective coatings, solar thermal reflective coatings, water-based reflective thermal insulation coatings, thermal sunscreen coatings, ceramic thermal insulation coatings, and so on. It is mainly used as a film-forming material with good weather resistance, strong water resistance, strong aging resistance, strong adhesion and elasticity, and good compatibility with thermal insulation filler and reflective filler. It is light and hollow and resistant to high temperature. A filler with high thermal resistance, good reflectivity and radiation, ultra-fine powder with high refractive index, high surface finish, high heat reflectivity and high emissivity is suitable as a reflective filler, and together with the film-forming binder constitutes low radiation transmission. The hot layer can effectively block the transfer of heat. The thin-layer heat-insulating reflective coating can be used in combination with porous materials for painting in buildings, vehicles, petrochemical tank equipment, grain storage, cold storage, containers, pipelines, etc.
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