Endres, Klaus

Koch, Thomas

Kreutzer, Rainer

Mennig, Martin

Oliveira, Peter William de

Rogin, Peter

Schmidt, Helmut K.

Scientific documents from the Saarland University,

Proceedings of the 3rd-iccg 
 
749 
Development of antireflective coatings for automotive glazing by 
wet chemical processing 
 
M. Mennig, P. Rogin*, P.W. Oliveira, R. Kreutzer, Th. Koch, K. Endres, H. Schmidt 
Institut für Neue Materialien, Im Stadtwald 43, 66123 Saarbrücken, Germany,  
 
 
A wet chemical coating technique for dielectric multilayers with antireflective (AR) 
properties on automotive glazing has been developed. The coating solutions consist of SiO2 
and TiO2 nanoparticles of 10 nm and 4 nm respectively in isopropanol which carry 
epoxysilane surface ligands. Batches of 100 l are prepared in appropriate reactors under 
controlled conditions. A 4- layer AR system is deposited on side 1 and side 4 of an 
automotive windscreen by dip coating with constant withdrawal speeds. Each single layer 
is cured for 5 minutes at 120°C. Finally, the whole AR stack is fired at 450°C for 1 h, 
leading to a homogeneous bluish residual reflectance. The design of the AR stack had been 
optimized for flat angles of incidence by computer simulation, in order to minimize 
reflections from the dashboard into the drivers view. Therefore, a residual reflectance of 
about 2 % to 4 % is obtained for perpendicular incidence in the range from 490 nm to 700 
nm wavelength. For an incident angle of 60°, the reflectance is decreased from 15 % 
(uncoated) to 6 % and for an angle of 65° from 20 % to 10 %. 
The coatings show the same scratch hardness as uncoated glass in taber abrasor tests, and 
no degradation is observed in salt water boiling test for more than 11 days and UV test for 
more than 340 h. 
                                                 
* corresponding author 
tel. (+49) (0)681/9300-319, fax (+49) (0)681/9300-223, email: rogin@inm-gmbh.de 
 


Development of antireflective coatings for automotive glazing by wet chemical processing

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Proceedings of the 3rd-iccg  749 Development of antireflective coatings for automotive glazing by wet chemical processing  M. Mennig, P. Rogin*, P.W. Oliveira, R. Kreutzer, Th. Koch, K. Endres, H. Schmidt Institut für Neue Materialien, Im Stadtwald 43, 66123 Saarbrücken, Germany,    A wet chemical coating technique for dielectric multilayers with antireflective (AR) properties on automotive glazing has been developed. The coating solutions consist of SiO2 and TiO2 nanoparticles of 10 nm and 4 nm respectively in isopropanol which carry epoxysilane surface ligands. Batches of 100 l are prepared in appropriate reactors under controlled conditions. A 4- layer AR system is deposited on side 1 and side 4 of an automotive windscreen by dip coating with constant withdrawal speeds. Each single layer is cured for 5 minutes at 120°C. Finally, the whole AR stack is fired at 450°C for 1 h, leading to a homogeneous bluish residual reflectance. The design of the AR stack had been optimized for flat angles of incidence by computer simulation, in order to minimize reflections from the dashboard into the drivers view. Therefore, a residual reflectance of about 2 % to 4 % is obtained for perpendicular incidence in the range from 490 nm to 700 nm wavelength. For an incident angle of 60°, the reflectance is decreased from 15 % (uncoated) to 6 % and for an angle of 65° from 20 % to 10 %. The coatings show the same scratch hardness as uncoated glass in taber abrasor tests, and no degradation is observed in salt water boiling test for more than 11 days and UV test for more than 340 h.                                                  * corresponding author tel. (+49) (0)681/9300-319, fax (+49) (0)681/9300-223, email: rogin@inm-gmbh.de  

http://scidok.sulb.uni-saarland.de/volltexte/2010/2986/pdf/sm200005.pdf

Development of antireflective coatings for automotive glazing by wet chemical processing

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Scientific documents from the Saarland University,

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