advanced super-hydrophilic inorganic coating materials

advanced super-hydrophilic inorganic coating materials

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 hydrophilicity?

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".

What is Angle of Contact?

How the self-cleaning mechanism works

How the self-cleaning mechanism works

Exposure test

UP

Click each photograph to view larger

Appearance after 262 days of exposure
Exposure test

Experimental data

UP

Experiment [1]

[Painted boards evaluated]
A board applied with DNT Beau Silicone (white) only and the same overcoated with NNC-150

Results
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

UP

Click each photograph to view larger

Before application

Before application Before application

After application

After applicationAfter applicationAfter application
Copyright (C) 2007 Crane. All Rights Reserved.