Superhydrophobic coatings with high flexibility and mechanical durability can well address many practical application problems. To this end, we proposed and fabricated a kind of bio-based superhydrophobic (multi-walled carbon nanotubes) CNT@PU (polyurethane) coatings. It was demonstrated that the CNT@PU coatings with 64% soft segment content possessed the preferable bonding strength (5B) with metal substrates. The multi-walled carbon nanotubes, as additive materials, were used to construct the microscopic structures of the coating surfaces, which made polyurethane surface superhydrophobic (water contact angle being 156.9°, and water sliding angle being 4.3°). Furthermore, the high bonding strength between CNT and coating matrix led to robust mechanical durability of superhydrophobic CNT@PU coatings, and the coatings remained superhydrophobicity after 10 cycles of abrasion under 100 g load pressure. Also, the superhydrophobic coatings could well resist 5 cycles of tape-peeling action, and presented outstanding flexibility. The superhydrophobic CNT@PU coatings with high flexibility and mechanical durability could be applied to various substrates suggesting their big potential in future real-world application.

具有高柔韧性和机械耐久性的超疏水涂料可以很好地解决许多实际应用问题。为此，我们提出并制造了一种生物基超疏水（多壁碳纳米管）CNT @ PU（聚氨酯）涂料。事实证明，软链段含量为64％的CNT @ PU涂层具有与金属基材的优选粘合强度（5B）。使用多壁碳纳米管作为添加材料来构造涂层表面的微观结构，使聚氨酯表面具有超疏水性（水接触角为156.9°，水滑移角为4.3°）。此外，CNT与涂层基体之间的高粘合强度导致超疏水性CNT @ PU涂层具有强大的机械耐久性，在100 g负载压力下进行10次磨蚀后，涂层仍保持超疏水性。而且，超疏水涂层可以很好地抵抗5次胶带剥离动作，并具有出色的柔韧性。具有高柔韧性和机械耐久性的超疏水性CNT @ PU涂料可用于各种基材，这表明它们在未来的实际应用中具有巨大的潜力。