In order to tackle the poor durability of 2-D super hydrophobic microfiber suede leather, a construction method of 3-D super hydrophobic microfiber suede was proposed inspired by the hydrophobic structure of lotus leaf surface and the special 3-D network structure of microfiber nonwoven. The mixture of fluorine-containing waterborne polyurethane and nano precursor ( tetraethoxysilane ) was uniformly impregnated to superfine fiber nonwoven, and under weak acid conditions the nano precursor was induced to in-situ generate nano SiO2 particles inside the microfiber suede, which formed a lotus-like micro/nano rough surface with overall self-similarity. A 3-D super hydrophobic microfiber suede leather was bionically constructed, and its morphology, chemical composition, contact angle, friction durability and chemical stability were measured and characterized. The results show that the water contact angle of microfiber suede surface is up to 153. 5°. After 2 100 times of abrasion, soaking for 24 h in aqueous solutions ( pH=1 and 14) containing ethanol, p-xylene, tetrahydrofuran, and n-hexane, soap washing for 10 times, exposing to UV light for 24 h, and heat treatment, the water contact angle is still around 150°, demonstrating a durable 3-D super hydrophobicity.
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