Research On Building Glass Thermal Insulated Paint

Building Glass Thermal Insulated Paint was mainly studied in this paper. The research was focused on the preparation of thermal insulated nano powder, the relationship between near infrared ray blocking and electricical properties, the preparation of nano slurry, the synthesis and characterization of building Glass Thermal Insulated Paint, and comparative thermal test on one classroom with building Glass Thermal Insulated Paint used on windows in one building of our school. This research field belonged to interdiscipline of material science and building science and technology.Antimony, Copper, Iron and Zinc, Antimony doped SnO2 based materials were studied by sol-gel method, especially antimony-doped tin oxide (ATO). The factors of preparation on microstrcture, surface morphology, electricity and optical properties were analyzed. ATO nano powder had low resistivty with Sb/Sn=6~10at%, calcined to 600~800℃for 60 min, ATO nano crystallite size was 10nm. NIR blocking ratio of nano ATO powder was increased with the increasing Sb concentration. When Sb/Sn>10at%, NIR blocking ratio declined. Though the resistivity and NIR blocking ratio of ATO powder were not linear, they were related. When the resistivity was decreased, the NIR blocking ratio would be improved.pH value, dispersant and grinding time were studied to prepare stable nano ATO slurry. When pH value=6~10, ATO slurry was stable. C3H5ON and Na5P3O10 could effectively improve the stability of ATO slurry. Stabilizing agent and thickener agent were added into the slurry during the process of grinding with Na5P3O10 as dispersant, which could get high stability nano slurry. The high solid content of ATO slurry was 56wt%.The effects on NIR blocking were discussed during the synsis of nano transparent thermal insulated glass paint, and environment, water resistance, hardness and anti-aging properties were mearsured. The NIR blocking ratio could be improved 10~20%, when the mean grain size of nano ATO slurry was decreased effectively. The high content of ATO slurry in paint, high solid content ATO slurry could enhance the NIR blocking.Coating with ATO can only shield the near infrared from 1500nm to 2500nm. H1 powder could shield NIR from 800nm to 1400nm, and H2 powder could shield NIR from 600nm to 1200nm. H1 and H2 were added to ATO powder individually, which were prepared to get nano composite slurry. NIR blocking ratio of glass paint was increased with the increasing H1, H2 content in composite powder, and the transmittance of visible light of H2 was low.Inorganic silicon resin was first used to prepare nano transparent thermal insulated glass paint with solvent based ATO slurry. It was found that the NIR blocking rate of thermal glass paint could be improved by adding H3 compound. When H3 content was 0.5wt%, the NIR blocking rate was 93.7%, transmittance of visible light (τv) was 61.7%, Se value was 0.52, andτv/Se was 1.19.Nano transparent thermal insulated glass paint was put into practice in the classrooms of our school. Two similar classrooms were choosen as contrasted rooms, and one of them was coated with glass paint. Solar radiation, room temperature, black globe temperature, and long- wave radiation were measured. Solar radiation of coated glass was 50% of uncoated glass. The room temperature difference and black globe temperature difference near the windows were bigger than that of other measuring points. The surface temperature of curtains and windows were measured by hand-hold infrared thermal camera. The surface temperature of curtains in coated room was 3.5℃lower than that of uncoated room, and the surface temperature of glass was 7℃higher than that of uncoted room.DeST-c was applied to simulate the room temperature of two rooms. The simulation temperature was almost consistent with the practical temperature in classroom, and the temperature difference was less than 0.5℃. The cooling load of uncoated room was 162.3 kW·h /m2, and coated room 156.0 kW·h /m2.