The work aims to effectively construct superhydrophobicity on the inner surface of packaging materials, enhance the mechanical durability of material superhydrophobicity, and achieve a highly stable superhydrophobic state. The effects of low-pressure spray parameters on the microstructure and material hydrophobicity were investigated. Roll coating, low-pressure spraying, and different parameter settings were adopted to compare the hydrophobic performance of the composite coating solution formed on the inner surface of packaging materials. Through process parameter adjustment, the optimal process parameters for effectively constructing a superhydrophobic packaging inner surface were determined as follows: spray pressure of 1.6 bar (1 bar=100 kPa), hydraulic pressure of 1.2 bar, substrate preheating temperature of 60 ℃, hot plate temperature of 100 ℃, and spray distance of 120 mm. Under these conditions, the water contact angle of the prepared superhydrophobic surface stably reached above 175°, the impact resistance of the superhydrophobic inner surface reached 85 drops, and the mechanical durability was increased by 15 times. In conclusion, higher gas pressure than hydraulic pressure contributes to the optimal atomization and film-forming performance of the coating. With the assistance of heating regulation, a stable micro-nano hierarchical structure can be fabricated. Low-pressure spraying is more suitable for the efficient construction of superhydrophobic packaging inner surfaces compared with roll coating. This study successfully achieves a highly durable and stable superhydrophobic interface, meeting the research objective of improving the anti-adhesion performance of packaging.
Key words
superhydrophobic /
low-pressure spraying /
surface microstructure /
micro-nano structure /
mechanical durability
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