The invention discloses a
colored heat insulation type
radiation refrigeration film based on hollow SiO2 microspheres and a preparation method thereof, and belongs to the technical field of
new materials. The monodisperse hollow SiO2 microspheres are used for preparing a three-dimensional
photonic crystal structure color, the hollow structure can form a high
refractive index ratio with a
polymer and endow the film with a beautiful structural color, the heat
conductivity of the material is reduced, the purposes of heat insulation and heat preservation are achieved, and the
heat management capacity is effectively improved. The micron-sized particles for reflecting
sunlight are large in particle size and cannot be filled in gaps of the
photonic crystal structure to damage the structural color, the
polymer for film forming permeates into the gaps of the
photonic crystal structure, and the micron-sized particles and the photonic
crystal are cured in the
polymer film, so that the film forming effect is improved. The problem that the structural color and the
radiation refrigeration material are poor in
bonding strength is solved. The
daytime net
refrigeration power of the prepared film can reach 95.6 W / m < 2 >, the temperature of a building can be reduced by 9.7 DEG C, raw materials are low in cost and easy to obtain, a
metal reflecting layer is not needed, the preparation method is simple, and the film is expected to be applied to energy-saving buildings on a large scale.