NNC150
Self-Cleaning Mechanism of NNC-150
What is hydrophilicity?
A wall which is attractive to water is hydrophilic, in other words, the surface of the wall displays hydrophilicity. When water is dropped on the hydrophilic surface, water is not repelled by the surface and spreads to a wider area. On the other hand, a water-repellent surface sheds water and water forms a drop.
What is Angle of Contact?
When the angle of contact, an angle that is formed between the surface of a solid and a water drop when it touches the surface, is small, the surface of the solid is "hydrophilic". When the angle of contact is large, the surface repells a water drop and is "water repellent".
How the self-cleaning mechanism works
Exposure test
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Experimental data
Experiment [1]
[Painted boards evaluated]
A board applied with DNT Beau Silicone (white) only and the same overcoated with NNC-150
| Tested Item | NNC-150 | View Silicon | ||
| Initial Conditions | Appearance of the Coating |
- | No irregularities | |
| Angle of Contact (degree) | 14.7 | 84.2 | ||
| Exposure to pollution (In Osaka, Japan) |
1 month | Appearance of the Coating(Δ L) |
No sign of contamination(0.3) |
Slightly contaminated(0.9) |
| Angle of Contact (degree) | 32.0 | 75.4 | ||
| 3 months | Appearance of the Coating(Δ L) |
No sign of contamination(0.3) |
Contamination observed(1.7) | |
| Angle of Contact (degree) | 32.0 | 79.4 | ||
| Accelerated weathering test (Super UV test) |
400 hours | Gloss retention (%) |
50.6 | 36.3 |
| Color difference (Δ L) |
0.3 | 0.3 | ||
| 1000 hours | Gloss retention (%) |
27.2 | 21.3 | |
| Color difference (Δ L) |
0.3 | 0.3 | ||
| Angle of Contact (degree) |
32.0 | 83.0 | ||
Experiment [2]
| Tested Item | Conditions | Hydrophilic Material | |
| NNC-150 (Super-hydrophilic inorganic ceramic coating) |
|||
| Adhesion | Temporary adhesion | Cross-cut tape peeling test | 10 on a point of 10 |
| Boiling-water resistance | Immersion into boiling water 8 hrs. | Appearance | No swelling or peeling (No discoloration) |
| Cross-cut tape peeling test | 10 on a point of 10 | ||
| Pencil hardness | Mitsubishi Pencil "Uni" | Damage | H |
| Tear | 4H | ||
| Conductivity | Conductivity(&Omega) | 10V | 3.44x10 9 |
| 250V | 3.01x10 9 | ||
| 500V | 2.41x10 9 | ||
Photographs of working examples
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Before application
After application
