Study On The Thermal Insulation Coatings Of High Reflectivity In Infrared Range

Thermal insulation coatings of high reflectivity in infrared range is a kind of functional coating materials that can reflect significantly the near-infrared solar radiation and also present excellent infrared emissivity in the mid or far-infrared band and reduce coating surface's temperature without energy consumption.Preparing waterborne acrylate emulsion by emulsion polymerization in this paper, is used as film forming matter and applied to thermal insulation coatings of high reflectivity in infrared range. In the course of preparing thermal insulation coatings of high reflectivity in infrared range, four kinds functional fillers: rutile type titanium pigment talc, hollow microspheres, potassium titanate whiskers and silica aerogel are added to form different heat insulation coatings system and are analyzed in SEM, XRD, distribution of reflection. Meanwhile preparation process of heat insulation coatings and dispersion, characterization methods of nano-particles in preparing thermal insulation coatings are studied in this paper. Testing method of thermal insulation, reflection, basic properties for coatings is studied. Heat insulation effect of functional materials: potassium titanate whiskers, silica aerogel, rutile type titanium pigment talc, hollow microspheres from high to low. Therefore we mainly evaluate different amounts of potassium titanate whiskers, silica aerogel and rutile type titanium pigment talc for influence of heat insulation properties of coatings. Meanwhile, heat insulation effect of coatings with functional materials in glass test plate is superior to heat insulation effect of coatings with functional materials in iron, middle densityan and plaster test plate.The results that reasonably chance percentage of potassium titanate whiskers, silica aerogel and rutile type titanium pigment talc will significantly improve heat insulation performances of the coatings. In a simulated sunlight of the testing equipment, when percentage content of potassium titanate whiskers in coatings is 15, temperature difference between upper and lower surface of glass test plate with content of 15 percent for potassium titanate whiskers in coatings is 10℃; when percentage content of silica aerogel in coatings is 1, temperature difference between upper and lower surface of glass test plate with content of 1 percent for silica aerogel in coatings is 9℃; when percentage content of rutile type titanium pigment talc in coatings is 15, temperature difference between upper and lower surface of glass test plate with content of 15 percentage for rutile type titanium pigment talc in coatings is 8℃. Temperature difference between upper and lower surface of glass test plate with content of 15 percent for potassium titanate whiskers in coatings than without content for potassium titanate whiskers in coatings will increase by 5℃. The coatings with content of 15 percent for potassium titanate whiskers show significant heat insulation effect. With its wind tunnel structure, potassium titanate whiskers will have structural heat insulation properties. The durability problem of heat insulation coatings is needed to solve in the further research.