Adhesion and thermal stability of thickness insensitive spectrally selective (TISS) polyurethane-based paint coatings on copper substrates

Thickness insensitive spectrally selective (TISS) paint coatings based on a polyurethane polymeric binder deposited on copper substrates were investigated to obtain information about their service lifetime. The degradation of TISS paint coatings was performed according to the methodology worked out...

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Bibliographic Details
Published in:Solar energy materials and solar cells 2009-05, Vol.93 (5), p.630-640
Main Authors: Kunič, R., Koželj, M., Orel, B., Šurca Vuk, A., Vilčnik, A., Slemenik Perše, L., Merlini, D., Brunold, S.
Format: Article
Language:English
Subjects:
Accelerated test procedure
Applied sciences
Energy
Equipments, installations and applications
Exact sciences and technology
Lifetime assessment
Natural energy
Organic coatings
Solar absorbers
Solar collectors
Solar energy
Solar thermal conversion
Spectral selectivity
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Summary:Thickness insensitive spectrally selective (TISS) paint coatings based on a polyurethane polymeric binder deposited on copper substrates were investigated to obtain information about their service lifetime. The degradation of TISS paint coatings was performed according to the methodology worked out within Task 10 of the IEA's Solar heating and the cooling programme. The activation energy ( E a) for the degradation process was derived from vibrational band changes of the polyurethane binder recorded in the infrared hemispherical reflectance spectra of TISS paint coatings exposed to different thermal loads. The results of the vibrational band analysis were correlated with cross-cut tests, showing that the coatings started to lose integrity at 190 °C but protected the copper substrate against oxidation perfectly even at 200 °C (15 days). An accelerated test procedure confirmed that TISS coatings could be safely used in solar collectors for at least 45 years.
ISSN:0927-0248
1879-3398
DOI:10.1016/j.solmat.2008.12.026