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Thermal insulation material
Background: Traditional thermal insulation materials are mainly used to increase gas void fraction, reduce thermal conductivity and conductivity. In order to increase convective heat transfer and radiative heat transfer in the use environment, fiber insulation materials must have a thicker coating, while inorganic insulation materials for profiles must be assembled, which has many defects, such as more joints, damaged appearance, poor waterproof and short service life. Therefore, people have been seeking and researching a new kind of material which can greatly improve the heat insulation and reflection properties of insulation materials. In the 1990s, NASA researchers developed a new type of space thermal insulating and reflecting ceramic layer (Therma-Cover) to solve the heat transfer control problems of spacecraft. The material is composed of tiny ceramic particles suspended in inert latex and has high reflectivity and high radiation. Thermal performance such as rate, low thermal conductivity and low heat storage coefficient has excellent insulation reflection function. This kind of high-tech material has been widely used by the people in the field of aerospace abroad, used in construction and industrial facilities, and has been exported to China for some large-scale industrial facilities. But the drawback is that the material's high price of $20 / kg really makes many industries in the country sigh, unbearable. Therefore, a new craze for developing new insulation materials has been quietly launched in China. The coatings have selected silicone acrylic emulsion and waterborne fluorocarbon emulsion with excellent heat resistance, weatherability, corrosion resistance and waterproofing properties as the film-forming material. The finely hollow ceramic particles, known as space age materials, are filled with hollow ceramsite. The coatings consist of highly reflective layers of visible and near infrared light in the range of 400-1800 nm, and air microporous layers with very low thermal conductivity are introduced to insulate the heat transfer. By strengthening the remarkable impedance of reflective solar heat and convective heat transfer, the radiant heat transfer and convective heat transfer can be effectively reduced, and the heat balance temperature of the object surface can be lowered. The roof temperature can be lowered by 20 C at the highest and the indoor temperature can be lowered by 5 10 C. The insulation grade of the product is R-33.3, the thermal reflectivity is 89%, and the thermal conductivity is 0.030W/m.K.
Energy saving building materials, green building materials