The classification and features of the building insulation of exterior wall coating

In recent years, with people's increasingly attention to energy conservation and environmental protection construction, building insulation of exterior wall coating is more and more attention. Excellent building external wall thermal insulation coating can effectively prevent heat conduction, lower the temperature of the surface coating and internal environment, so as to improve the working environment, the purpose of reducing energy consumption, therefore widely used in building facades, ship deck, motor shell, etc.


building heat preservation exterior wall coating according to the mechanism of thermal insulation and heat preservation methods are usually divided into three broad categories: barrier insulation paint, reflective thermal insulation coating and radiation heat preservation coating.


block type thermal insulation coatings


cut off heat insulation coating of insulation mechanism is simple, is through the heat resistance of the passive cooling heat insulation coating. Usually, used in the coating with low thermal conductivity composite or with very low thermal conductivity of air, to obtain good heat insulation effect.


block exterior wall coating usually has a low bulk density, low thermal conductivity and low dielectric constant. Choose weathering resistance, good toughness and film base material, supplemented by proper dispersing agent and film-forming agent, the insulation aggregate bond together, coated in equipment or wall surface, forming a certain thickness of insulation layer, so as to achieve the effect of heat preservation.


reflective thermal insulation coating


in general, the sun's radiation spectroscopy is divided into three zones: ultraviolet range of 0. 2 to 0. 4 microns, accounting for 5% of the solar energy; Visible light range of 0. 4 to 0. 72 microns, accounting for 45% of the solar energy; Near infrared region is 0. 72-2. 5 microns, accounting for 50% of the solar energy. It can be seen that solar energy is mainly concentrated in the wavelength of 0. 4 to 1. 8 m of visible light and near infrared region, therefore, of the reflection type exterior wall coating in the wavelength range of the higher the reflectivity of the solar radiation, the thermal insulation coating is better.


the reflection heat insulation coating is by selecting proper resin, metal or metal oxide pigments, fillers and production process, the preparation of a highly reflective coating to reflect heat from the sun, in order to achieve the purpose of heat insulation and cooling.


the radioactive heat insulation coatings


exterior wall coating is to absorb the buildings to send out quantity of heat in the form of a certain wavelength of radiation in the air, in order to achieve a good heat insulation and cooling effect, known as the radiation heat insulation coating. In order to obtain good effect of infrared radiation, first of all, the infrared radiation must be through the successful transfer to the outer space atmosphere.


atmospheric infrared radiation mainly from water vapor, carbon dioxide, ozone and suspended particles in the atmosphere of water vapor and carbon dioxide, a major role. In 8 ~ 13 nm wavelength range, water vapour and carbon dioxide absorption ability is weak, make the atmosphere of 8 to 13. 5 nm infrared radiation has the high through the ability. Therefore, in order to make the coating in 8 ~ 13. 5 nm band with high emissivity, the need to join high absorption values in the band material, with the increase of capability of radiation of radiation coating in the band. Infrared radiation absorbed radiation heat energy, change and intensifying internal movement of molecules, from high to low particle level of thermal radiation, thereby reducing the temperature of the material by illuminate.


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