Water-based radiation cooling coating as well as preparation method and application thereof

Abstract

The invention discloses a water-based radiation cooling coating as well as a preparation method and application thereof. The water-based radiation cooling coating is prepared from the following components in parts by mass: 10-25 parts of water-based film-forming resin with infrared radiation, 35-42 parts of a sunlight reflecting material, 1-9 parts of an auxiliary agent and 30-42 parts of water. After being prepared into a coating, the water-based radiation cooling coating disclosed by the invention is dried to form numerous micro-gaps, and cooperates with a sunlight reflecting material to generate air-resin, air-filler and resin-filler multi-interfaces, so that the transmission path of light is shortened, the scattering effect of light is enhanced, the temperature of the back of the coating can be about 5 DEG C lower than the ambient temperature, and the service life of the coating is prolonged. And the cooling effect is obvious. In addition, the coating is good in high-temperature-resistant and anti-aging effects, is suitable for outer wall surfaces of occasions such as residential buildings, commercial buildings and industrial factory buildings, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the field of energy-saving coatings, and in particular relates to a water-based radiation cooling coating and a preparation method and application thereof. Background technique [0002] Radiative cooling (RC), as a passive cooling method, is a method with great potential. Unlike active cooling, which requires electricity, radiative cooling emits thermal radiation to outer space (3k) through a transparent window of the atmosphere without consuming any energy. It achieves the purpose of reducing carbon emissions and protecting the environment, and has great application value. Various radiative coolers have been developed so far: multilayer radiative cooling structures require high production costs and complex process designs. Polymer films such as PDMS, PMMA, PVF, PEO, etc. typically have a high emissivity of 0.95 due to the intrinsic absorption of functional groups. However, due to the need for low VOCs, polymer coatings are ...

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Problems solved by technology

Due to the inherent ultraviolet absorption of titanium dioxide, its reflectivity can only reach 90.7%, which cannot achieve a large cooling effect, and the coating absorbs ultraviolet light and is easy to age, so it cannot maintain the radiation cooling effect for a long time

The radiation cooler developed by Liu et al. is also a double-layer structure. The upper layer uses transparent epoxy resin to achieve high emissivity, while the lower layer needs to add a metal silver layer to reflect sunlight, which increases the cost and the on-site process is more complicated.

In addition, the reflectivity of today's paint cannot reach more than 90%, and the internal heat cannot be released, so although it can cool down after covering the paint, the temperature inside the house will still generate heat storage and cannot be lowered below the ambient temperature.

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