A superhydrophobic diurnal passive radiation cooling porous film and its preparation method

Abstract

The invention discloses a superhydrophobic diurnal passive radiation refrigeration porous membrane and a preparation method thereof. The preparation method comprises the following steps: (1) dispersing inorganic nanoparticles in water to form an inorganic nanoparticle dispersion; Add a fluorine-containing group modifier to the particle dispersion, stir magnetically at 20-40°C for 15-24 hours, modify the inorganic nanoparticles, and obtain a modified inorganic nanoparticle dispersion; the particle size distribution of the modified inorganic nanoparticles 50-1000nm; (3) Dissolving the organic polymer in an organic solvent to form an organic polymer solution; (4) Adding the modified inorganic nanoparticle dispersion to the organic polymer solution to disperse evenly to form a precursor solution; (5) Coating the precursor solution on the substrate and drying it to obtain a superhydrophobic diurnal passive radiation cooling porous membrane. The preparation method of the invention is simple and low in cost, and the prepared diurnal passive radiation refrigeration porous membrane has superhydrophobic self-cleaning ability.

Description

technical field [0001] The invention relates to the technical field of coating structures, in particular to a superhydrophobic daytime passive radiation refrigeration porous film and a preparation method. Background technique [0002] Under the circumstance of global warming, the demand for cooling technology is becoming more and more acute, especially in the hot summer. Urban infrastructure, which has been vigorously developed to accommodate more people, has increased energy consumption. With the increase of refrigeration equipment such as air conditioners, the emission of harmful gases and air pollution have a significant impact on human health and the environmental heat island effect. Therefore, radiation cooling, a cooling technology that can achieve cooling effect without consuming any energy, is urgently needed. [0003] Objects on Earth can dissipate heat into the cold outer space in the form of electromagnetic waves through radiation cooling. Passive radiation cool...

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Problems solved by technology

[0006] In the prior art, although the cooling effect of the radiation cooling design of the multi-layer structure is obvious, this multi-layer design undoubtedly increases the difficulty of preparation, and some coating structures need to rely on noble metal substrates to achieve high reflection, which greatly increases the practical application. costs and cycles

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