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Hydrophilic coat

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What is hydrophilic coating agent?
Hydrophilic coating agent is a polysilicate inorganic coating agent.

It forms a thin and strong supeprhydrophilic antifouling coating film, which exhibits superior stain inhibition property (self-cleaning effect). In addition, as its refractive index is low, transparency of glasses will increase.

Features
Easy application

Its viscosity is low, so it can be easily applied with a sponge or by spraying.

Strong coating film

As it is a polysilicate inorganic coating agent, its hard coating film with superior weather resistance will continues to deliver maximum performance.

Self-cleaning effect

When coated, silanol group will be formed to create a supeprhydrophilic silica film, and all the dirt on the film will get washed off when it rains.

Improved transparency

By thinly coating a material with low refractive index, it improves transparency.

Uses
Metal materials / ceramic exterior paints / tiles, etc.

Protection of base material and antifouling effect based on self-cleaning and antistatic properties.

Window glass for buildings

By applying it on the outside of the window panels, it protect them against dirt, and as a result cleaning frequency will be reduced.

Solar cell cover glass

Maintains and improves light transmissibility through protection against dirt and low refractive index.

Window glass of automobiles and trains

Improvement of transparency based on its hydrophilic property, and antifouling effect that lasts for a long time.

Mirrors

Antifog effect based on super supeprhydrophilic property.


Outdoor weathering test of painted plates.
Left….coated, right….uncoated.

Antifouling effect on window glass
Left….coated, right….uncoated.
Application to solar panel
Visible light transmission of solar cell cover glass coated with hydrophilic coat.
Item name 400mm 500mm 600mm 700mm 800mm
Uncoated cover glass 91.3% 91.6% 91.5% 91.0% 90.4%
Coated cover glass 92.1% 92.8% 93.0% 92.8% 92.4%
Item name 400mm 500mm 600mm
Uncoated
cover glass
91.3% 91.6% 91.5%
Coated
cover glass
92.1% 92.8% 93.0%
Item name 700mm 800mm
Uncoated
cover glass
91.0% 90.4%
Coated
cover glass
92.8% 92.4%


Coating agent: Hydrophilic coating agent
Film thickness: Dry film thickness 0.3µm.
Measuring equipment: UV/VIS spectrophotometer V530 (by JASCO Corporation)

Showering test result
Water resistance: Showering test (Pump: Discharges 70ml/c㎡ water per minute)

Note: “-“ indicates “unmeasurable” by contact angle gauge.

Item name Before test 24 hours 48 hours 72 hours 96 hours 120 hours
Uncoated cover glass 50.6 46.3 40.7 38.2 36.6 35.5
Coated cover glass 2.5 3.0 5.3 5.0
Item name Before test 24 hours 48 hours
Uncoated cover glass 50.6 46.3 40.7
Coated cover glass 2.5
72 hours 96 hours 12 hours
Uncoated cover glass 38.2 36.6 35.5
Coated cover glass 3.0 5.3 5.0


Showered 4,000 ml/cm3 per hour, which is equal to 4,000mm hourly precipitation. This is almost equivalent to yearly amount of rainfall in Osaka.
24 hours (1 day) of showering equals to 24 years of rainfall.
The transition of the contact angle of the coated solar cell cover glass is indicated above.

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