1.

Polyhedral oligomeric silsesquioxane trisilanols as pigment surface modifiers for fluoropolymer based Thickness Sensitive Spectrally Selective (TSSS) paint coatings

TISS paint coatings based on black pigment, dispersed in a fluoropolymeric resin binder have been made without added Al flakes. We investigated the effect of trisilanol POSS on the surface modification of pigment. IR analysis, TEM and EDXS measurements provided firm evidence for the formation of a POSS layer on the surface of the pigment particles. SEM micrographs revealed uniform distribution of pigment particles with an average size of ~300 nm. Beneficial effect of the pigment functionalization was assessed from the measured spectral selectivity of coatings of various thicknesses.

COBISS.SI-ID: 4603162

2.

Life expectancy prediction and application properties of novel polyurethane based thickness sensitive and thickness insensitive spectrally selective paintcoatings for solar absorbers

Thermal degradation of the TSSS PUB and TISS PUA coatings on Al substrates was studied by following TASK10 of IEA's Solar heating and cooling program. Thermal load tests were performed at different temperatures and various time intervals. Degradation of the coatings was assessed using changes of as and eT, intensity changes of vibrational modes and peel-off tests. The results revealed that degradation of PU binder was attributable to breaking of urethane linkages (confirmed with AFM and XPS). Life expectancy was estimated to be 22.77 years for TISS PUA and at least 25.96 years for TSSS PUB.

COBISS.SI-ID: 5509729

3.

The effect of polyhedral oligomeric silsesquioxane dispersant and low surface energy additives on spectrally selective paint coatings with self-cleaning properties

Water and oil-repellent properties of TISS coatings, made of fluoropolymer binder, were obtained by the addition of POSS. Paint dispersions were made by modifying black pigment with IB7T7(OH)3 POSS dispersant and single-capped IBTMS. SEM micrographs confirmed beneficial dispersive effect of IB7T7(OH)3 compared to IBTMS. TISS coating surface exhibited bi-hierarchical roughness, resulting in water sliding angles (10°, indicating possible self-cleaning effect (θwater~150°, θn−hexadecane~55°). The use of POSS enhanced spectral selectivity to highest known so far for black TISS (eT~0.24, as~0.93).

COBISS.SI-ID: 4304154

4.

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

TISS coatings based on polyurethane (PU) binder deposited on Cu substrates were studied to obtain their service lifetime. The degradation of the coatings was investigated by following Task10 of IEA's Solar heating and cooling program. The Ea for the degradation process was derived from vibrational band changes of the PU binder. The results, correlated with cross-cut tests, showed that the coatings started to lose integrity at 190°C but perfectly protected Cu substrate against oxidation even at 200°C (15 days). It was confirmed that TISS coatings could be safely used for at least 45 years.

COBISS.SI-ID: 4117018