What is the principle of PET anti-fog film

It is well known that the PET anti-fog film is a functional film with anti-fog function, which is composed of an anti-fog coating, a PET layer, a back adhesive layer, and a release film.

The main component of the anti-fog coating is a polymer material with a hydrophilic group or a hydrophobic group. As a functional coating, the coating can be divided into thermosetting anti-fog coating and UV (ultraviolet) light-curing anti-fog coating due to its different curing methods, and it is hydrophilic due to its different anti-fog mechanism. The difference between anti-fog coating and hydrophobic anti-fog coating.

The hydrophilic anti-fog coating makes the surface of the object hydrophilic, and then uses the hydrophilic group factor in the anti-fog coating to absorb water affinity, reduce the surface tension of water, and reduce the contact angle between water molecules and the surface of the object , So that the water vapor will wet, diffuse or adsorb on the surface of the object before it gathers into small water droplets on the surface of the object, forming an ultra-thin transparent water film, and no longer scatter the incident light, and does not interfere Human sight, so as to achieve the purpose of anti-fog.