Radiation refrigeration film, radiation refrigeration composite film and radiation refrigeration product

Abstract

The invention relates to a radiation refrigeration film. The radiation refrigeration film comprises a matrix layer and a filler distributed in the matrix layer, the refractive index of the material ofthe matrix layer is n, n is 1.3 to 1.7, the refractive index of the filler is m, the difference between n and m is x, an absolute value of x is greater than or equal to 0.05%, the emissivity of the radiation refrigeration film in an atmospheric window of 7-14 microns is greater than or equal to 80%, the heat reflectivity of the radiation refrigeration film in a wave band of 300-2500nm is greaterthan or equal to 10%, and the glossiness of the radiation refrigeration film is less than or equal to 20GU. Through selection of the material and the filler of the matrix layer and adjustment of the relationship of the refractive index, the radiation refrigeration effect of the radiation refrigeration film is excellent, and the glossiness is low. The invention further provides a radiation refrigeration composite film and a radiation refrigeration product, light pollution in the using process can be effectively reduced, and the excellent radiation refrigeration effect is guaranteed.

Description

technical field [0001] The invention relates to the technical field of thin films, in particular to radiation cooling films, radiation cooling composite films and radiation cooling products. Background technique [0002] Radiation cooling composite film is a film that can adjust temperature. It has the advantages of no energy consumption and no pollution. It is widely used in energy-saving building materials, photovoltaic industry, outdoor products and other fields. Among them, in the field of energy-saving building materials, radiative cooling composite films are usually attached to the exterior walls or roofs of buildings. The radiative cooling composite films can reflect sunlight and transfer heat to outer space in the form of infrared radiation in the atmospheric window band. , to reduce the indoor temperature of the building. However, the specular reflection of the traditional radiative cooling composite film is obvious, which is easy to cause light pollution. [0003...

AI Technical Summary

Problems solved by technology

However, the specular reflection of the traditional radiative cooling composite film is relatively obvious, which is easy to cause light pollution

[0003] The reason is that in the traditional radiation cooling composite film, the radiation cooling film is only made of a single polymer material or inorganic fillers are added inside the polymer material, the haze of the radiation cooling film is only about 1%, and the atmospheric window of 7 μm to 14 μm The emissivity is about 75%, the solar band heat reflectance is about 8%, and the gloss is about 70GU

Therefore, the glossiness of the radiation cooling composite film made by using this radiation cooling film reaches about 380GU, which leads to serious light pollution during its use.

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