Research And Application Of Efficient Solar Energy Functional Coating

Recently, fossil and other non-renewable energy sources gradually decrease, the world's energy structure will significant change, solar energy will gradually replace conventional energy and become an important and indispensable energy. Utilization of solar light and heat is hot today. Concentrating solar thermal power generation and medium/high temperature solar thermal utilization of solar energy is the development trend of the future. Solar energy absorbing paint is a more economical way. The main technical solution is to develop high-performance and high temperature solar selective absorbing coating material. The key point is that it is necessary to improve the coating of solar energy absorption efficiency, but also to have low emissivity. Furthermore, high temperature resistance and good value for money need to be solved. But now the paint-type coatings can not balance heat resistance, absorption efficiency and low emission rates. High performance medium/high temperature solar selective absorption coating need to be prepared in this paper, the main research work is present below:1) Preparation of high performance solar selective absorption nano-functional powder materials. The FeCuMnOx was synthesized by using NaOH, NaHCO3, NH3·H2O as precipitating agents. The influences of different precipitating agents were compared. It was shown that the NaOH was the best precipitating agent. The powder size was about 50 nm, well-distributed, the crystal structure was good. The influences of various raw materials ratio and sintering temperature on the properties of the functional powders were discussed. It was shown that the property was the best when the Fe:Cu:Mn=1:2:2, sintering temperature was 600℃. The CoCuMnOx were synthesized too, but the properties were poor.2) Screening of high performance heat resistant film-forming materials (Binders). (a) The preparation of the aluminum sol inorganic binder used for the coating was studied and the synthesis process was investigated; (b) Organic high molecular resin binder including the high-temperature silicone resin and modified polyimide resin was chosen.3)With high temperature silicone resin, modified polyimide resin and self-made alumina sol as binders, FeCuMnO3.5 as functional solar selective absorption powder, three different solar energy absorbing coatings were prepared, and their absorption performance and emission properties were compared by changing the PVC and the thickness. The best performance was shown when using alumina sol as binder, After heated at 600℃, the paint did not change the absorption rate, and the emissivity even lower than the paint before heat. The solar coatings obtained in this subject were cost-effective. The applications in the medium/high temperature solar thermal utilization of solar energy will have good prospects.