Porous radiation refrigeration film and preparation method thereof

Abstract

The invention provides a porous radiation refrigeration film and a preparation method thereof. The method comprises the following steps of: (1) dissolving a material having infrared electromagnetic wave radiation capability corresponding to a radiation atmosphere window, with a first solvent to form a uniform mixed solution; (2) forming the mixed solution on a substrate; and (3) forming a second solvent which does not dissolve the material on the substrate on which the mixed solution is formed to obtain the porous radiation refrigeration film. The second solvent and the first solvent are mutually soluble. The porous passive radiation refrigeration film is prepared through a phase separation method; the preparation process of the porous passive radiation refrigeration film is simple; the film forming speed of theporous passive radiation refrigeration film is high; the micron pore diameter of the radiation refrigeration film can be accurately controlled, so that radiation cooling intensity can be adjusted, the reflectivity of the radiation refrigeration film to visible light is effectively adjusted, and a single-layer all-day radiation cooling function is achieved; the film preparedthrough the method can achieve the functions of indoor temperature reduction, refrigeration, freezing, thermoelectric power generation and the like, and therefore, the purposes of energy conservationand emission reduction are achieved.

Description

technical field [0001] The invention relates to the technical field of functional film materials, in particular to a method for preparing a radiation cooling film and the radiation cooling film prepared thereby. Background technique [0002] Today, the energy crisis is becoming more and more serious, and people have a great demand for artificial refrigeration systems such as air conditioners. However, most traditional refrigeration systems have problems such as large power consumption, release of greenhouse gases, and need to be connected to the power supply at any time. Therefore, the research on the new artificial refrigeration system is of great significance. [0003] Radiative cooling refers to the phenomenon that objects spontaneously radiate heat to outer space through the atmospheric window, and exchange heat with outer space to achieve cooling. The thin film prepared by using the principle of radiation cooling has the advantages of no extra external energy consumpti...

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Problems solved by technology

The multi-layer metamaterial structure is represented by Aaswath P.Raman et al., who proposed using Ag as the reflective layer, seven SiO 2 , HfO nano-layer film structure, which has an average emissivity of about 0.65 in the atmospheric window, and a reflectivity of 0.97 in the visible light band, and can cool down by 5°C compared with the ambient temperature under direct sunlight; the photonic system structure is based on Yao Zhai et al. Represented by people, it is proposed to use Ag as the reflective layer and polymethylpentene to wrap SiO 2 Microsphere film structure, infrared emissivity up to 0.96, visible light reflectance up to 0.96, cooling power up to 96W / m under direct sunlight 2 However, most of the films with these structures have problems such as complex structure, complicated preparation process, and high cost, and it is difficult to realize large-scale production, and the problem needs to be solved urgently

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