Heat transfer medium heat insulation material

Industrial thermal conductivity of insulation materials tend to be lower, the indicator is closely related to specific industries and specific applications. For this reason, people have been seeking on A can greatly improve the thermal insulation material for the reflective insulation new materials. In the 1990s, the US National Aeronautics and Space Administration (NASA) scientists to solve the problem of aircraft and aerospace heat transfer control to develop a new type of reflective insulation space porcelain (Therma-Cover) used, the material is suspended in an inert by a number of the latex fine particles composed of ceramic, which has high reflectivity, high thermal emissivity properties, low thermal conductivity, low coefficient of thermal storage and the like, has excellent heat reflection function. This high-tech material from the aerospace industry in a foreign country to promote the use of the people, for buildings and industrial facilities, and has been exported to our country, for some large industrial facilities. But the drawback is that the material US $ 20 / kg price is really expensive so many domestic industry hope was disappointed, unbearable. Also in the 1990s, NASA NASA spacesuits to solve the high and low temperature and the outside world cut off from the research and development of new materials made of airgel. This material is called the silica airgel. It is the smallest known density of the solid material, and so far the best insulation performance material. The minimum density of up to 3kg / m³, thermal conductivity as low as 0.013W / (m · K) at room temperature. This nano-tech material has to promote the field of aerospace military civilian areas, its price down to an affordable price point for civil. So far, the domestic production of industrial silica airgel insulation technology has been felt more complete. 1. International development trend of the global insulation material is moving in efficiency, energy saving, thin-layer, heat insulation, waterproof outer sheath direction of integration development, in the development of new insulation materials and energy-saving technologies in line with the structure of the insulation at the same time, more emphasis targeted use of thermal insulation materials, according to the design and construction standards, and strive to improve thermal efficiency and reduce costs. Have launched a thin layer of thermal insulation coatings research at home and abroad, the United States there are many companies producing such heat-insulating ceramic coating layer, such as the US SPM Thermo-Shield, Thermal Protective Systems launched Ceramic-Cover, JHInternational of Therma-Cover and other products. 2. Domestic trendsThe selection of a coating with excellent heat resistance, weather resistance, corrosion resistance and water resistance of acrylic emulsion and an aqueous emulsion of fluorocarbon film material, use very fine particles known as space age hollow ceramic filler material, the hollow ceramic more grains obtained coating film combination arrangement configuration, its sun 400 to heat the visible and near infrared region of the high reflection 1800nm ​​range while introducing very low thermal conductivity of air in the coating film microporous layer to insulate heat transfer. Thus by significantly impedance reinforcement reflecting solar heat and convection transfer, can effectively reduce the radiation heat transfer and convection heat, thereby reducing the thermal equilibrium temperature of the surface, can roof highest temperature decrease 20 ℃, the indoor temperature is lowered 5 ~ 10 ℃ . Product adiabatic level to R-33.3, heat reflectance of 89%, a thermal conductivity of 0.030W / m.K. Trends: building insulation is to save energy, improve the living environment and an important aspect of the use of functions. Building energy consumption proportion in the whole of human energy consumption is generally 30-40%, the vast majority of energy consumption for heating and air conditioning, so the building energy efficiency is of great significance. And because the insulation coating with water as the diluent medium, free of volatile organic solvents, no harm to humans and the environment; it is only about 1/5 the cost of production of similar foreign products, and it is as a new thermal insulation paint, has a good economic, energy and environmental protection, thermal insulation, and the advantages of simple construction and more and more people\’s attention and favor. Such reflective coating and the heat-insulating space is experiencing a direction from the thermal insulation to the building insulation industry based changes, by a thin insulation to thick-film technology shift, which is the next major insulation materials one of the development. Space reflective insulating coating layer applied by a vacuum chamber of the hollow ceramic spherical particles in the coating material, to build an effective thermal barrier, not only its own thermal resistance, low thermal conductivity, high reflectivity and heat, reducing building sun absorption of radiant heat, reducing temperature of the coating surface and an interior space, it is recognized as one of experts unanimously promising energy-efficient material. However, at present in our country, rock wool, glass wool, expanded perlite and other traditional insulation materials still occupy the main market, although the price of these materials is relatively low, but high density, poor thermal insulation properties (thermal conductivity 0.065-0.090W / m · K), large thick paving material loss, high hygroscopicity, poor seismic performance and environmental performance, the use of such insulation material can not be achievedEnergy efficiency standards. In addition to asbestos and glass wool insulation and other building material itself with a lot of harmful substances, can not meet the requirements of human health. While the new foam-based insulation material (such as EPS, XPS, PUF, PET, etc.) present in the production of only 40% of the total heat insulating material, as compared with conventional insulation materials, foam (e.g., Airex, etc.) thermal low conductivity, good thermal insulation effect, light weight, low water absorption, good chemical stability, easy construction, but due to foam relatively high prices, thus limiting the country\’s large-scale use. At present, China\’s new building, more than 95% of building energy consumption is still high, mainly because of reasons still use traditional insulation materials. Thus want to improve the energy efficiency of buildings, it is necessary to increase production and use of new insulation materials