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The principle of anti-fog film
2023-07-28
PET anti-fog film is a functional film with anti-fog function, which is composed of anti-fog coating, PET layer, adhesive layer and release film in sequence.
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 is divided into heat-curing anti-fog coating and UV (ultraviolet) photo-curing anti-fog coating due to its different curing methods, and because of its different anti-fog mechanism, it is hydrophilic The difference between anti-fog coatings and hydrophobic anti-fog coatings.
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 affinity absorb water, 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 tiny water droplets on the surface of the object, forming an ultra-thin transparent water film, and will no longer scatter the incident light, and will not interfere People's line of sight, so as to achieve the purpose of anti-fog.
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 is divided into heat-curing anti-fog coating and UV (ultraviolet) photo-curing anti-fog coating due to its different curing methods, and because of its different anti-fog mechanism, it is hydrophilic The difference between anti-fog coatings and hydrophobic anti-fog coatings.
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 affinity absorb water, 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 tiny water droplets on the surface of the object, forming an ultra-thin transparent water film, and will no longer scatter the incident light, and will not interfere People's line of sight, so as to achieve the purpose of anti-fog.
The hydrophobic anti-fog coating makes the surface of the object hydrophobic, and then uses the hydrophobic group factor in the anti-fog coating to repel the water molecules to increase the contact angle between the water molecules and the surface of the object, so that the water vapor gradually condenses on the surface of the object into a Water droplets with a large contact angle are difficult to stay on the surface of the object, and will continue to automatically slide down (that is, produce the "lotus effect"), so as to achieve the purpose of anti-fog or waterproof. Since the hydrophobic anti-fog coating uses the "lotus effect" to achieve anti-fog, as the water droplets continue to slide down, some irregular water marks will be left on the surface of the object, and these water marks will have some scattering effect on the incident light , more or less reduce the light transmittance of the object, affect people's sight, and the anti-fog effect will become worse, which has limitations.
