Composite coating with photo-thermal conversion capability changing with environmental temperature variation and preparation method thereof

Abstract

The invention provides a composite coating with the photo-thermal conversion capability changing with the environmental temperature variation and a preparation method thereof, and belongs to the technical field of construction coating preparation. The composite coating is composed of a bottom layer coating and a surface layer coating; and the bottom layer coating is prepared from high-emissivity / high-thermal-expansivity powder, and the surface layer coating is prepared from low-emissivity / low-thermal-expansivity powder. The preparation method comprises the steps that two parts of coating gluewith the weight being the same are prepared, the high-emissivity / high-thermal-expansivity powder is added into the one, the low-emissivity / low-thermal-expansivity powder is added into the other one, water is added into the two parts of coating glue respectively, and the two kinds of coating are prepared; a wall is covered with the bottom layer coating, thus the bottom layer coating is formed, after the bottom layer coating forms a film, surface layer coating is brushed, and the surface layer coating is formed. The powder adopted in the preparation method are both materials which are cheap andeasy to obtain, the composite coating can be formed only by blending the raw materials at the proper proportions and brushing and spraying, that is, the purpose of energy conservation can be achievedthrough a certain form of technique combination.

Description

technical field [0001] The invention belongs to the technical field of preparation of architectural coatings, and in particular relates to a composite coating whose light-to-heat conversion ability can vary with ambient temperature and a preparation method thereof. Background technique [0002] Studies have shown that the use of heat-reflective coatings can reduce the temperature in buildings by about 9°C. In winter, heat-reflective coatings used for building interior walls or glass curtain walls can keep the heat of the building in the building, thereby achieving a warming effect. Therefore, heat-reflective coatings have become one of the hot spots in energy-saving technology research in recent years. Among them, pigments and fillers are the key to determine the heat reflection performance, heat radiation performance and heat barrier performance of heat reflective coatings. Most of the research on heat reflective coatings has focused on the research of pigments and fillers...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing coatings cannot dynamically adapt to changes in the external thermal environment, and to provide a composite coating whose light-to-heat conversion ability can change with the ambient temperature and its preparation method. This composite coating is a variable Emissivity thermal control coating, the bottom layer is the coating containing high emissivity / high thermal expansion rate powder, and the surface layer is superimposed with low emissivity / low thermal expansion rate powder coating. When the temperature is low, the low emissivity / low thermal expansion rate The powder covers the high emissivity / high thermal expansion rate powder to reduce the emissivity of the wall; when the temperature is high, the high emissivity / high thermal expansion rate powder expands, and the proportion of the coating surface increases, achieving high emissivity in summer , low emissivity in winter, automatic regulation of wall heat dissipation

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