Superhydrophobic coating solutions were prepared using fumed silica nanoparticles and trimethylethoxysilane (TMES) as precursors. At this time, the surface of silica nanoparticles was modified by TMES from hydrophilic to hydrophobic in various types of catalysts and organic solvents. The prepared coating solutions were coated on a cold rolled steel sheet by using a spin coater, and then superhydrophobic coating films were prepared by thermal curing. In this process, the effects of the amount of silica nanoparticles added, the type of catalysts, and the type of organic solvents were observed on the hydrophobicity of the coating films. As the content of silica nanoparticles added increased from 0 g to 0.08 g, the contact angle of the coating films increased from 93° to 151°, and when 0.08 g of silica nanoparticle was added, it showed superhydrophobicity of 151°. On the other hand, when nitric acid and hydrochloric acid, strong acids, were used as catalysts, the coating films showed low hydrophobicity of 73° and 86°, respectively. However, when oxalic acid, a weak acid, was used, the coating film showed superhydrophobicity of 151°. In addition, with methanol as an organic solvent, the coating film showed superhydrophobicity of 151°, while when i-propanol and n-butanol were used, the coating films exhibited low hydrophobicity of 97° and 91°.

使用气相二氧化硅纳米颗粒和三甲基乙氧基硅烷（TMES）作为前体制备超疏水涂料溶液。此时，在各种类型的催化剂和有机溶剂中，二氧化硅纳米颗粒的表面被TMES改性，从亲水性变为疏水性。使用旋涂机将所制备的涂布液涂布在冷轧钢板上，然后通过热固化来制备超疏水涂膜。在该过程中，观察到二氧化硅纳米粒子的添加量，催化剂的类型和有机溶剂的类型对涂膜的疏水性的影响。随着二氧化硅纳米颗粒的添加量从0 g增加到0.08 g，涂膜的接触角从93°增加到151°，当添加0.08 g二氧化硅纳米颗粒时，它显示出151°的超疏水性。另一方面，当使用硝酸和盐酸，强酸作为催化剂时，涂膜显示出低的疏水性，分别为73°和86°。然而，当使用草酸（一种弱酸）时，涂膜显示出151°的超疏水性。另外，使用甲醇作为有机溶剂，涂膜显示出151°的超疏水性，而当使用异丙醇和正丁醇时，涂膜显示出97°和91°的低疏水性。