Preparation and performance of superhydrophobic polyester fabrics for passive daytime radiative cooling
To obtain superhydrophobic fabrics with passive daytime radiative cooling performance,SiO2 particles modified with fluorosiloxane and epoxysiloxane were used to coat the polyester fabric via dipping.Then polydimethylsiloxane was sprayed on them to form a cross-linked structure.The morphology and chemical structure of polyester fabrics before and after modification were analyzed,and the spectral characteristics of organic-inorganic composite coated fabrics with different coating amounts were investigated.Meanwhile,the cooling performance and hydrophobic property of the coated polyester fabrics were also studied.The results show that when the coating amount of polyester fabric is 29.67 mg/cm2,the solar reflectance reaches 94.3％,and the middle infrared emissivity achieves 91.2％.In direct sunlight,the coated polyester fabric realizes an efficient temperature reduction of 8.2 ℃ compared with the ambient temperature inside test chamber,and has a lower temperature of 2 ℃ compared with the pristine polyester fabric.The static water contact angle of the composite coated fabric is 151.4°and the rolling angle is 6.1°;after 100 rubs,the static water contact angle drops to 147.8°.The superhydrophobic fabric has excellent self-cleaning properties and good abrasion resistance,and has broad application prospects in the field of high temperature energy saving and radiative cooling.
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