| More diversification and functionalization of fabrics have received continuous attention in recent years.With global warming and the frequent occurrence of extreme heat,functional fabrics with cooling performance have become a research hotspot.Passive daytime radiative cooling as a clean and green cooling method has attracted much attention.Daytime radiative cooling fabric prepared by combining radiative cooling technology with fabric can provide a certain radiative cooling effect,which is an ideal strategy for outdoor objects to achieve cooling.However,its mostly white color and monotonous color limit its application value and prospects.In this paper,we prepared a double-coated colorful radiative cooling fabric consisting of a coloring layer and a highly reflective particle layer that has a good radiative cooling effect even with rich colors.The main work is as follows:（1）Inorganic particles modified with silane coupling agents were used as the main reflective particles,and micro-nanostructures were constructed on the surface of the fabric by spraying,and the solar reflectivity of the fabric was enhanced by regulating the surface microstructure.The effects of particle size and coating amount of inorganic particles on solar reflectance were thoroughly investigated.Determine the particle size of 1000 nm and the 30.21 mg·cm-2 coating quantity for better conditions.The radiative cooling coating fabric band reflectance is an average of 89.94%in the sun,and the average infrared emission rate is 91.73%in direct sunlight when compared to the unfinished cotton cooling effect of up to 6.1°C.（2）A composite coated fabric featuring a passive daytime radiative cooling mechanism and self-cleaning properties was prepared by scraping with fluorine-modified inorganic particle A,inorganic particle B,and polydimethylsiloxane（PDMS）as the main raw materials,with an average reflectivity of 88.2%in the solar wavelength band and an average emissivity of 91.9%in the mid-infrared,and was able to provide a cooling effect of 5.6°C relative to the unfinished fabric.The water contact angle on the surface of the composite coated fabric reaches 146.6°,the tensile strength is nearly doubled,and the good hydrophobic effect can still be maintained after the friction experiment,which has good outdoor use value.（3）The pigment particles with high reflectivity were selected and modified by an acrylate polymer coating to enhance the dispersion and reduce the particle size.The modified pigments were sprayed on the radiative cooling fabric with high reflectivity as coloring agents,and the double-coated fabric with different color appearances was prepared.Among the different colorfully radiative cooling double-coated fabrics,the yellow radiation cooling fabric can be up to 9.8°C lower than the ambient temperature and can also achieve a temperature reduction effect of 5.6°C compared with the unfinished fabric.The red double-coated fabric with a more recognizable color was selected to conduct a cooling test on a complex human surface,and the results showed that the colored double-coated fabric could achieve a cooling effect of 1.8°C compared with the conventional red contrast sample.The prepared double-coated fabric has good moisture permeability and excellent UV protection,and its mechanical properties have also been improved,which has good potential for practical application. |
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