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Temperature control coating material

Author:admin   AddTime:2021-09-24

According to Stefan-Boltzmann's law, the infrared radiation of the target is proportional to the fourth power of the temperature. Controlling the temperature can effectively reduce the infrared radiation of the target. The choice of adhesives for temperature-control coatings is the same as that for low-emissivity coatings, requiring the adhesives to have good infrared permeability, compatibility with fillers, and excellent physical and mechanical properties and film-forming properties. At present, the research of temperature control coatings is mainly focused on fillers. In order to reduce the target surface temperature, fillers generally use materials with large thermal inertia and low thermal conductivity, mainly thermal insulation materials and phase change materials.

Hollow microspheres are widely used in thermal insulation coatings because of their low density, strong pressure resistance, and low thermal conductivity. By adding hollow microspheres to the infrared stealth coating, the temperature of the coating surface is reduced to a certain extent. The study found that compared with the solar reflectance and thermal insulation properties of fillers such as borosilicate hollow glass beads, ceramic beads and fly ash float beads, hollow glass beads have a higher solar heat reflectance, and its value is 0.88. The Dombrovsky LA system has studied the infrared reflection performance of hollow glass beads. The coating prepared with hollow glass beads as a filler has a strong reflection peak at 4.5m, and it is concluded that the reflection at 8.5~13.5m is caused by the rough surface of the beads. The conclusion caused by the degree. In order to further increase the reflectivity of hollow glass beads to solar heat, a metal film is usually plated on the surface of the beads. The metal-coated hollow glass beads are prepared by electroless plating, and mixed with pigments and adhesives to prepare a tarpaulin with infrared stealth ability. Under long-term irradiation of 1.88kW/m2, the temperature rises to 7°C, which can reach a certain level. The invisibility effect.



The main form of application of phase change materials in infrared stealth coatings is to microencapsulate the phase change materials. Through the state changes of the phase change materials, it absorbs or releases heat and stabilizes the target surface temperature within a certain range. According to the phase transition temperature of the core material, phase change microcapsules can be divided into low temperature (below 15℃), medium low temperature (15-40℃) and medium temperature (40~75℃) phase change microcapsules. Table 5-11 lists several typical phase change microcapsules. It can be seen from the table that the current temperature control gradient of phase change microcapsules can basically meet the requirements of infrared stealth, but the adjustable temperature range is small, which restricts Application of phase change microcapsules in infrared stealth materials.

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