Infrared selective radiation cooling nano-functional composition and preparation method thereof

Abstract

The invention discloses an infrared selective radiation cooling nano-functional composition and a preparation method thereof. The composition is prepared from silica, a rare earth silicate compound and a molybdate compound according to a mass ratio of 1:(0.5-2):(0.5-2) by the steps of ball milling and uniform mixing, and the silica, the rare earth silicate compound and the molybdate compound havestrong infrared selective radiation performances at 8-10 [mu]m, 9-12 [mu]m and 10-14 [mu]m respectively. The rare earth silicate compound and the molybdate compound are prepared by a sol-gel process and a high-temperature solid phase process according to the stoichiometric ratios SiO2-(0.5-2)Re2O3-(0.1-1.0)Na2O (Re = La, Sm, Eu, Gd, Tb, Dy, Er, Tm, Yb, Y or Sc) and RMoO4 (R = Mg, Ca, Sr or Ba). The infrared selective radiation cooling nano-functional composition can be used for preparing functional devices such as day and night double-effect radiation coolers to provide zero-energy cooling, energy saving and efficiency improvement for buildings, grain and oil stores, solar battery back plates and the like.

Description

technical field [0001] The invention belongs to the technical field of thermal radiation, and relates to an infrared selective radiation cooling nanometer functional composition and a preparation method thereof. Background technique [0002] With the rapid development of the global economy, the problem of energy crisis has become increasingly prominent. Air-conditioning cooling accounts for a considerable proportion of energy consumption. The development of efficient radiation cooling technology is of great significance for reducing power consumption and protecting the environment. Radiation cooling refers to the process that objects on the earth transfer heat to outer space through infrared atmospheric windows. Radiation cooling materials are materials with spontaneous cooling functions prepared based on this principle. In the process of heat transmission, the atmosphere is the main transmission medium of infrared radiation. Although the atmosphere is transparent to visible...

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Problems solved by technology

[0004] At present, the radiation cooler under the condition of no light at night has been realized, but the high-performance radiation cooler that meets the practical performance requirements under the daylight condition has not yet appeared.

The existing publicly reported radiation coolers mainly include the following methods: one is to construct a nanostructured radiation cooler through photo-etching technology and nano-plasma deposition technology. The cost of photon radiation coolers with this structure is high, and it is impossible to achieve large-scale Large-scale production, and the photon radiation cooler has low structural strength, easy damage, and poor long-term stability

The other is to bond inorganic functional substances such as titanium dioxide and glass microspheres with polymers to a highly reflective metal substrate to obtain a radiation cooler. However, due to the absorption of functional substances such as titanium dioxide and glass microspheres in the infrared spectral region Insufficient performance, the non-infrared atmospheric window of the prepared radiation cooler has high absorptivity and emissivity outside the range of 8-14 μm, poor selective radiation ability, easy to absorb a large amount of additional atmospheric thermal radiation from the environment, and then make the radiation The overall cooling effect of the device is weakened, and the effective cooling power is not ideal

At present, the infrared selective radiation cooling nano-functional composition and its preparation process that can be used to meet the functional requirements of the day and night double-effect radiation cooling device and are easy to manufacture on a large scale and at low cost have not yet been reported.

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