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Effect of Thermal ageing on two selective paint coatings based on polysiloxane and polyurethane
Publication . Assunção, Ana Rita Vitorino; Cidade, Maria Teresa; Ferreira, Maria Cristina
Solar thermal collectors are a low cost and eco-friendly alternative for energy
production. The essential component in the collector is the solar absorber since it is where the
photo-thermal conversion occurs. One of the factors that change the absorber’s effectiveness is
the type of coating used. In this dissertation, spectrally selective paint coatings are studied – PC2
based on silicone and PC3 based on polyurethane. The degradation of both paints when
subjected to temperature accelerated ageing tests is studied. Tests were carried out at 320°C
for 300 and 600 hours. The fixed vehicle of the paints was analysed by FTIR. The spectra of the
composition of the paints before and after the ageing test were analysed by FTIR-ATR. In PC2
there was no change in the spectrum after ageing; however, in PC3 there was a change in the
structure of the paint, which lost polymer after ageing. Thermogravimetric tests were carried
out in an inert and oxidative atmosphere. In PC2 a low percentage of mass loss was identified
while in PC3 the percentage of mass loss was more accentuated, thus verifying both FTIR-ATR
results. To complete the analysis, the samples were analysed in a SEM/EDS. Finally, these results
were compared with the optical properties of the paint, concluding that although the optical
properties of both paints behave similarly after the ageing test, spectrally selective paints,
depending on their composition, have distinct degradation behaviours when subjected to high
temperatures.
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Fundação para a Ciência e a Tecnologia
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9471 - RIDTI
Número da atribuição
PTDC/EMS-ENE/0578/2014