| Inorganic decorative board is a new type of exterior wall decoration material that is widely used at present.The current research and application focus on the ratio of materials,mechanical properties,durability and decoration,etc.The research on the multi-functionality of decorative board is relatively rare.If the decorative board is given the heat reflection function,the indoor temperature can be reduced,and the energy consumption of building cooling can be reduced,which has good research value and application prospect.In this paper,rutile nano-TiO2(NT for short)was used as the heat-reflecting material,and an inorganic decorative board with heat-reflection function was prepared by a layered method.The main research contents are as follows:(1)The heat-reflective inorganic decorative board was prepared by the internal doping method,and the influence of NT content and particle size on the compressive strength of the decorative board was studied.Under the condition of the same NT particle size,the compressive strength of decorative board increases first and then decreases with the increase of NT content;When 2% NT is added,the compressive strength of the decorative board is the highest.Under the same condition of NT content,the compressive strength of decorative board increases with the increase of NT particle size.Compared with NT with high dosage(6%-10%),NT with low dosage(2%)can effectively reduce the total porosity of decorative board,Compared with 25-100 nm NT,2um doped NT can refine the pore structure of the decorative board,the proportion of small pores increases,and the median pore size and average pore size decrease.(2)The heat-reflecting inorganic decorative board was prepared by the layering method,and the influence of the thickness of NT surface layer on the compressive strength of the decorative board was studied.The compressive strength of decorative board decreases with the increase of NT surface layer thickness;When the thickness of the NT surface layer is 1/7 of the thickness of the decorative board,its influence on the strength of the decorative board is small,and the strength reduction is only 1%.(3)Using the temperature sensor method and the solar reflectance method,the effect of NT content and particle size on the thermal reflection performance of decorative panels was studied.Under the condition of the same NT particle size,the thermal reflection performance of the decorative board increases first and then decreases with the increase of NT content;When doped with 6% NT,the thermal reflection performance of the decorative board is the best.Under the condition of the same amount of NT,the thermal reflection performance of the decorative board increases first and then decreases with the increase of NT particle size;When the NT particle size is 100 nm,the thermal reflectivity of the decorative board is the highest.Mixing NT with different particle sizes can further improve the thermal reflectivity of the decorative board.(4)Considering the compressive strength and heat reflection performance,it was determined that the NT doping amount in the NT surface layer was 6%(of which the ratio of25 nm NT to 100 nm NT was 1:1),and the thickness of the surface layer was 1/7 of the plate thickness.In the natural exposure environment of the maximum temperature of 28 ℃,compared with ordinary decorative panels,the external surface temperature of the heat-reflective decorative panels can be reduced by 1.8 ℃,and the inner surface temperature can be reduced by 2.3 ℃.Using DEST software,the energy saving effect of the building is simulated.In the air conditioning period in Guangzhou(June to September),compared with ordinary decorative panels,the use of heat-reflective decorative panels can reduce the indoor temperature by 1.5 ℃ and reduce the energy consumption of building air conditioning by7.19%. |
PDF Full Text Request