Preparation of mineral radiative powder and application thereof to building heat-insulating coating

Abstract

The invention discloses preparation of mineral radiative powder and application thereof to a building heat-insulating coating. The mineral radiative powder is formed by mixing SiO2, Al2O3, MgO, Fe2O3, ZnO, Cr2O3, Co2O3, Ni2O3 and B2O3 proportionally, and performing three-stage calcination at 900 DEG C, 1,000 DEG C and 1,250 DEG C; the prepared products are mainly defective spinel phases, and the defective structures have a radiance of 0.94 within the wave band of 2.5-25 [mu]m. The filler provided by the invention is prepared through the three-stage calcination, and the calcinated products are of defective spinel structures; impurity ions cause lattice distortion, the symmetry of lattice vibration is reduced and the anharmonicity of polarized vibration is increased, which causes phonon combined radiation; the lattice distortion enhances radiance of infrared rays, so that the prepared coating has good radiative heat insulating performance.

Description

technical field [0001] The invention belongs to the field of materials, in particular to building insulating water-based coatings. Background technique [0002] The progress and development of science and technology have led to an increase in the demand for energy in human society, but in contradiction to the relative reduction in energy supply, the energy problem has become a serious obstacle restricting the sustainable development of human society in the 21st century. At present, with the rapid development of my country's construction industry, building energy consumption has also increased accordingly. The Ministry of Construction has proposed that "by 2010, the total energy consumption of urban buildings in the country should basically achieve 50% energy saving, and by 2020, the northern and coastal economically developed regions and megacities should achieve the goal of 65% building energy saving. This energy shortage and urgent need to reduce consumption The urgent st...

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Problems solved by technology

[0005] The preparation method of fillers in existing radiant heat-insulating coatings is generally made by directly mixing various raw materials with radiative functions or through one-time calcination. The fillers prepared by this method have a low emissivity, generally 0.7-0.8. The single product produced by calcination makes the radiation band range small, which limits the heat insulation effect of the coating, and the prepared coating coating cannot achieve the real heat insulation effect

Therefore, there is no really mature building heat-insulating coating in China, so the research on radiation-type heat-insulating coating is still in its infancy in my country.

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