Radiation refrigeration coating and its preparation method and application

Abstract

The invention discloses a radiation refrigeration paint and its preparation method and application. The radiation refrigeration paint comprises the following raw material components in terms of mass percentage: 4%-8% of porous cordierite, 10%-18% of titanium dioxide, acrylic resin 22%~35%, 0.5%~1.5% of silane coupling agent, 0.1%~1% of film-forming agent, 0.1%~1% of leveling agent, 0.1%~1% of dispersant, 0.2%~1% of defoamer %, thickener 0.1%-2%, anti-flash rust agent 0.1%-2%, and the balance is dipropylene glycol methyl ether acetate, which is prepared by mixing the above raw materials. The radiation cooling coating of the present invention has both high reflectivity of sunlight and selective high radiation rate in the atmospheric window, and its preparation method has the advantages of simplicity, low cost, etc., and at the same time, the radiation cooling coating prepared by the coating can realize all-weather refrigeration , good refrigeration effect, high use value and application prospect.

Description

technical field [0001] The invention relates to a radiant cooling coating, a preparation method and application thereof. Background technique [0002] Passive radiative cooling technology achieves cooling or even cooling without energy input. However, because most of the heat radiated out will be absorbed and intercepted by various components in the atmosphere, only a small part of infrared radiation can freely pass through the "atmospheric window" and be thrown into outer space. Therefore, to achieve efficient cooling, it is necessary It is required that the infrared radiation of the material be concentrated in the window band as much as possible, that is, 8-13 μm. To achieve daytime radiative cooling, in addition to satisfying selective radiation, it is also necessary to prevent the entry of solar heat. Therefore, the surface of the material should also have extremely high solar reflection capabilities. Although metamaterials have the potential to perfectly realize the a...

AI Technical Summary

Problems solved by technology

At present, the biggest problems of composite thermal insulation coatings are: 1. Although reflective fillers can strongly reflect sunlight, they are not strong enough for near-infrared reflection, weak in the heat dissipation capacity of infrared radiation in the window, and lack of selective infrared radiation characteristics; 2. Although the radiation filler has strong infrared radiation ability, it lacks selective infrared radiation characteristics, especially the weak reflection ability to sunlight. If it is partially replaced by reflective filler, it will weaken the reflection performance of the composite coating on sunlight

At present, there are many patents and documents on the preparation method of cordierite powder, but they focus on the particle size, purity and sintering activity of the powder, and none of them mention the sunlight (0.3-2.5μm) reflection ability of the cordierite powder. , and there is no related technology and enlightenment to improve its reflective ability and use it as a filler in thermal insulation coatings

In addition, there is no report on how to adjust the process to improve the infrared reflection ability of cordierite powder outside the atmospheric window (8-13 μm)

In fact, the cordierite produced in the prior art has a single pore size of only 240nm. According to the Mie theory and the research results of the light-absorbing layer of solar cells, this pore size will enhance the absorption of sunlight, so it is impossible Has excellent thermal insulation properties

Images