Super water repellent polymer hierarchical structure, heat exchanger having super water repellency, and manufacturing method therefor

A method for manufacturing a super water-repellent polymer hierarchical structure, comprising:

• forming a first parent substrate having a ratchet structure formed on an upper surface thereof and a super water-repellent nano structure formed on the ratchet structure;
• forming a protective layer for preventing the detachment of the super water-repellent nano structure on the super water-repellent nano structure;
• applying a liquid polymer on the first parent substrate;
• curing the applied liquid polymer;
• forming a second parent substrate by separating the cured polymer from the first parent substrate and washing the separated polymer;
• applying a liquid heterogeneous polymer on the second parent substrate;
• curing the applied liquid heterogeneous polymer;
• and
• separating the cured heterogeneous polymer from the second parent substrate and washing the separated polymer,
• wherein the separated heterogeneous polymer has a sliding angle of less than 10 degrees and
• wherein the protective layer includes a metallic material or a polymer material.