SONG Meihui, TANG Yali, LU Lixin, WANG Jun, QIU Xiaolin
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In this paper, waxy superhydrophobic coatings were prepared by ultrasonically dispersing hydrophobic nano-silica in a carnauba wax/ethyl acetate suspension. The superhydrophobic coatings were prepared on the surface of the glass sheet by a dip-coated method. The effects of the concentration of carnauba wax in ethyl acetate, the addition amount of hydrophobic nano-silica and the drying method on hydrophobic of superhydrophobic coatings was studied by single factor experiment. The contact angle, rolling angle and anti-adhesion performance under different factors were analyzed. The results showed that when the concentration of carnauba wax in ethyl acetate was 4 g/100 mL, the amount of nano-silica added was 1/2 of the mass of carnauba wax, and naturally dried at room temperature, the hydrophobic of the coatings was optimum. In this condition, the contact angle and roll angle of the hydrophobic coatings was 150.60 and 6°, respectively. Moreover, the coatings are applicable onto different substrates (e.g., glass slide, PE film, BOPP film and aluminum-plastic composite film) .Through the test of adhesion to yoghurt, it was found that the coating exhibited good anti-adhesion properties on various substrate surfaces, and the yogurt could roll freely thereon. Using the heat-sealing time as an index, the heat-sealing property after application of the coating was tested. It was found that the application of the coating did not affect the heat-sealing property of the high-temperature resistant material such as the aluminum-plastic composite film.