I am developing a solvent type uv curable urethane-acrylate coating agent.
Please tell us what methods are available to achieve super water-repellent properties (contact angle of 120 degrees or more).
You can try non thermal HMDSO plasma treatment with an optimum condition. HMDSO is commonly used to deposit thin hydrophobic films onto various surfaces, including urethane-acrylate.
If I'm not mistaken, your coatings are hydrophobic. So, if you rub them with sandpaper and create some roughness, they will become superhydrophobic. You can try this with any fluoropolymer that has a contact angle greater than 90 degrees. However, this won't work for philic materials.
If you need a thin functional layer, you can use the HWCVD technology for fluoropolymer. Adhesion is quite good on pretreated samples, such as those textured with laser (https://doi.org/10.3390/w15040719 ).
If there are no restrictions on coating thickness, feel free to use commercial repellents, like NeverWet for example.
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