Composition and working principle of AF coatings

Composition and working principle of AF coatings
AF is the abbreviation of anti-fingerprint, which literally means anti-fingerprint film. It represents an ability with an anti-fingerprint effect, strong anti-pollution ability, and is easy to clean. Before we talk about the principle, it is necessary to talk about surface energy.
The surface energy of the object is the key factor that determines the surface of the object. It directly affects the adhesion of surface materials (easy to stain the degree of fingerprints), the viscosity, and permeability of liquid and surface. The surface energy of a substance can be calculated from the contact Angle. The smaller the contact Angle θ is, the higher the surface energy is and the wetter the surface is. The greater the contact Angle θ, the smaller the surface energy, the less wet the surface of the object, the surface "non-sticky", and thus easy to clean.
Currently known low surface energy materials organic silicon and organic fluorine materials, the molecular group surface energy from large to small is:
-CH2->-CH3>-CF2->C-F2H>-CF3
Among them, the surface energy of the -CF3 group is as small as 6.17mJ/m2, and the calculated contact Angle is 115.12°, which is the largest known contact Angle of molecular repulsion.
It is generally believed that fluorine material is the only product that can meet the needs of users and be used for a long time. In the short term, fluorine materials are still the main material. AF technology can be temporarily understood as fluorine technology.
It should be added that the essence of the lotus leaf self-cleaning effect in nature is that there is a layer of ultra nanostructure on the surface. Although both show large droplet contact angles, their principle is different from AF film.

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