Glass Surface Coating

Introduction of Glass Surface Coating Products

In the photovoltaic field, improving the transmittance of glass means improving the power gain of the module, and the gain coefficient can almost reach 1:1. The technical principle adopted is to manufacture a nano-coating on the surface of the glass. The coating material has an extremely low refractive index (n), and the thickness is l/4n, about 100~200nm. In this way, the reflection of the incident light on the glass surface is coherently extinguished, forming the so-called AR (Anti-Reflection) layer. The refractive index of general solid materials is 1.4~2.8, and it is difficult to find a solid with a refractive index lower than 1.3. Therefore, nano-scale micropores need to be introduced into the AR anti-reflection layer, which can reduce the refractive index to 1.29~1.31 and the transmittance enhancement rate to 2.25~2.45%. The high-temperature sintering method is now commonly used to coat the glass surface with nano-scale core-shell polymer microspheres, and ablate them at high temperature to form micropores. Another function of sintering is to form a relatively strong bonding layer interface between the coating layer and the glass. Another method does not require sintering. Nanoparticles with ultra-low refractive index of different particle sizes can be introduced to form a Wenzel surface with a concave-convex structure, which also has the effect of anti-reflection and anti-reflection, and the efficiency of anti-reflection is very close. By adding an etchant, this type of nano-coating liquid that can be cured at room temperature can also form a strong bonding layer interface with the glass surface. What's even better at this time is that the coating also has super hydrophilic properties and can be maintained for a long time. When the modules are used outdoors, the hydrophilic surface can bring easy-to-clean characteristics, which can greatly reduce the number of cleaning times; in some areas, it can even be done without cleaning.

Since 2018, Fumo Tech has been involved in the field of surface treatment and has developed a variety of surface coating and surface functional films, such as hardening, scratch resistance, stain resistance, skin feel, super hydrophilic, super hydrophobic, hydrophobic and oleophobic, and hydrophilic anti-fog. In the field of glass surface treatment, Fumo Tech's WA7310 is a high-temperature sintered anti-reflection coating. This product is based on nano-scale hollow silicon microsphere technology, combined with inorganic silicone resin, silane and solvent to form a coating liquid, which is applied to the glass surface to form a nm-level coating layer. This coating layer can effectively reduce the reflection of the glass surface, thereby achieving a good anti-reflection effect. WA7360 is an aqueous or alcoholic nano-coating, with deionized water and small molecule alcohol as solvents and inorganic nanomaterials as solutes. The product has a low solid content and is clear and transparent (some models have a slight haze). The product is coated on the glass surface, and after the solvent evaporates, it is cured at room temperature to form a film with a thickness of 100~200nm. It provides the glass surface with many functional characteristics such as super hydrophilicity, easy cleaning, anti-static and anti-reflection. This coating can be constructed in the field, and Fumo Tech has accumulated many commercial cases. After the modules in the photovoltaic power station are coated, their power gain can generally reach between 2~6%. At the same time, Fumo Tech also provides surface treatment products for household items. For example, for bathroom mirrors, it provides anti-fog liquid WA7330, which prevents the glass surface from fogging up in hot and humid or freezing environments. For kitchens and bathrooms, it provides hydrophobic and oleophobic OS7210, which is clean, non-toxic, and does not get greasy, making the surface of objects very easy to clean.