Abstract
Recently, fluorine materials have been a serious cause of environmental concern. In response, a novel fluorine-free superhydrophobic coating is presented in this paper. A superhydrophobic coating based on silicone and surface-modified colloidal silica is explored and exploited. First, a superhydrophobic coating, based on silicone resins and fluorine group-modified colloidal silica, is developed. Then, the fluorine group-modified colloidal silica is replaced by octyl-modified colloidal silica, a superhydrophobic coating based on fluorine-free materials, octyl-functionalized colloidal silica, and epoxy-modified silicone. The hydrophobicity and coating integrity were investigated, and the fluorine-free coating shows good superhydrophobicity and coating integrity. The result demonstrates the feasibility of a fluorine-free superhydrophobic coating, thus providing an effective solution to the environmental problems caused by fluorine chemicals.
Highlights
The wettability of solid surfaces plays a very important role in our daily lives, as well as in many industrial processes
Schematic particles binder. diagram of the preparation process of the superhydrophobic coating based on particles and binder
To prove the functional fluorine group, which can be successfully attached to the colloidal silica prove the fluorine group, which analysis can be successfully attached to the colloidalonsilica with To a particle sizefunctional of 340 nm, first, XPS
Summary
The wettability of solid surfaces plays a very important role in our daily lives, as well as in many industrial processes. Superhydrophobic surfaces, with a contact angle larger than 150◦ and a roll-off angle less than 5◦ , have attracted significant attention because of their self-cleaning properties and their potential for practical applications in a wide range of fields. The effects of many factors, such as particle surface functionalities, volume fraction and dimension on hydrophobicity, and the integrity of coatings, were systematically investigated. Combining the hydrophobicity results with the coating integrity results, the optimized formulation was determined to include a 60% volume of fluorine-functionalized colloidal silica with a particle size of 340 nm and a fluorocopolymer. The fluorocopolymer is replaced by silicone materials, and a superhydrophobic coating system from fluorine-functionalized colloidal silica and silicone is studied. Its superhydrophobicity and the coating integrity are studied in this paper
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