Industrijsko uporabni organski polimerni spektralno selektivni premazi za sončne toplotne zbiralnike : doktorska disertacija

slovenian

doktorska dela

2015

Univerza v Mariboru, Fakulteta za kemijo in kemijsko tehnologijo

Solar thermal technology is the most likely source of renewable energy in Southern Europe and the Mediterranean. To enable its mass use, new high-performance, durable and economical materials should be developed. This work deals with organic polymeric coatings intended for solar thermal collectors that fulfill the above criteria. Black thickness sensitive spectrally selective (TSSS) and thickness insensitive spectrally selective (TISS) coatings were based on the technology of silane pigment treatment. We developed and optimized a TSSS coating that fulfills all set demands and can be applied with established industrial methods of paint application. Its durability was confirmed by an independent laboratory. We linked the surface properties of the coating's cured film to its selectivity and thus improved upon prior knowledge on spectrally selective coatings. Black and non-black TISS coatings were optimized. We pointed to a correlation between spectral selectivity of polyurethane spectrally selective coatings and the chemism of polyol used in its preparation. To increase the chroma value of TISS coatings an organic pigment was used for the first time in a TISS coatings successfully. Fluoropolymeric TSSS coatings were developed. Fluoropolyurethanic TSSS coatings are only suitable for niche applications such as facade collectors due to their high selectivity and low thermal durability. For such applications we developed high performance blue coatings based on organic pigments, the first use of an organic pigment in a TSSS coating. We demonstrated the possibility of development of thermoplastic fluoropolymeric TSSS coatings. By the use of silane treated black pigment and blue organic pigments and by subsequent fill factor optimization we developed high-performing and durable silicon polyester TSSS coatings. The coatings we developed are suitable for industrial use. They allow for production of economical, high-performing and durable solar thermal collectors. The knowledge gained in their development offers explanation of previously unknown or unexplained properties of spectrally selective coatings

07.08.2023