The anti-fog sunglasses coating technology mainly relies on changing the surface characteristics of the lenses to achieve the anti-fog function. The following are some key technical points:
Hydrophilic coating: Anti-fog coating usually alters the hydrophilicity of the lens surface, making it difficult for water vapor to condense into small water droplets on the lens surface. Coating materials such as polyurethane can form tiny protrusions and grooves on the surface of the lens, making it easier for water vapor to flow along the surface and form a uniform water film, thereby preventing the formation of water droplets.
Nanocomposite coatings: Some anti-fog coatings utilize nanotechnology to form superhydrophilic anti-static and antibacterial agents on the surface of the lenses, achieving anti-fouling, anti-fog and anti-static effects. This coating is combined with the lens through physical and chemical methods, preventing water from forming droplets on the surface but instead creating a uniform water film.
Gold nano-coating: Some studies have developed transparent coatings based on gold nanoparticles, which heat lenses by selectively absorbing infrared light in solar radiation and prevent water vapor condensation. This coating can heat up to 8 degrees Celsius in the sunlight, accelerating water evaporation and thus preventing fogging. In the absence of sunlight, the coating can also achieve anti-fogging through electric heating.
Electric heating anti-fog technology: By embedding heating elements such as resistance wires or carbon fibers in the lens, the temperature of the mirror surface is raised through electric heating, preventing water vapor from condensing into fog. This method is similar to the defogging technology for the rear window of a car, but it requires power support.
Coating durability and compatibility: High-quality anti-fog coatings not only need to have long-lasting anti-fog performance but also be compatible with other coatings of the lenses (such as anti-reflective coatings and hardening coatings) to ensure the optical transparency and durability of the lenses. Some coatings are achieved through thermal curing or UV curing methods, featuring excellent wear resistance and chemical resistance.
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