Radiation cooling film, radiation cooling composite film, radiation cooling products

Abstract

The invention relates to a radiation cooling film, comprising a base layer and fillers distributed in the base layer, the material of the base layer has a refractive index n, n is 1.3-1.7, and the filler has a refractive index m, The difference between n and m is x, the absolute value of x is ≥ 0.05%, the emissivity of the radiative cooling film in the atmospheric window of 7 μm to 14 μm is ≥ 80%, and the heat reflectance in the 300nm to 2500nm band is ≥ 10%, and the radiation cooling film is ≥ 10%. The glossiness of the refrigeration film is ≤20GU. In the present invention, the selection of the material of the matrix layer, the filling material and the adjustment of the relation of the refractive index make the radiation cooling film have excellent radiation cooling effect and low gloss. The invention also provides a radiation refrigeration composite film and a radiation refrigeration product, which can effectively reduce light pollution during use and ensure excellent radiation refrigeration effect.

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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