Development Of Thermal Insulation Putty For Building Exterior Wall

Building energy conservation is an important part of energy conservation in our country. Currently the most important measure to achieve building energy conservation is use of exterior wall thermal insulation materials. Insulation putty is a new type of the wall thermal insulation materials which are more extensively studied in recent years, with having the advantage of small dry density, low thermal conductivity, and anti-aging, better weather resistance, simple ingredients, fire prevention, low cost, easy construction.In the paper, Firstly deeply analyzing of the mineral composition and physical properties of fly ash cenospheres, And exploring the density and size of fly ash cenospheres on the impact of the thermal conductivity of insulation putty through orthogonal experiment, finding that density of0.451g/ml and size of40-60mesh cenospheres have lowest thermal conductivity, so this particle as primary functional filler is suitable. Secondly, mesoporous silica was obtained by sol-gel method, and surface modification of hexamethyldisilazane. Studying of thermal conductivity of the composite material when the mesoporous silica as filler and the elastic emulsion as adhesives, finding that mesoporous silica has smaller thermal conductivity, but has hydrophilic properties, easy adsorption of water molecules, leading to a certain degree of thermal conductivity increase, after the hydrophobic modification, the effect is better. Finally, the building’s exterior wall insulation putty was prepared by fly ash cenospheres as the main functional materials, ceramic beads, mesoporous silica and far infrared powder for the auxiliary functional materials, and added the right amount of elastic latex. The best ratio of each component is obtained by using orthogonal experimental design.The results showed that:(1) With the decrease the density and the particle size of fly ash cenospheres, the thermal conductivity of insulating putty gradually decrease;(2) Since the influence of adsorbed water, the thermal conductivity of mesoporous silica after modification decreases by half;(3) The thermal conductivity of mesoporous material slightly larger than natural macroporous structure of fly ash cenospheres;(4)The amount of fly ash cenospheres and far infrared powder have a more significant effect on the thermal conductivity of the insulation putty;(5)The volume shrinkage of insulation putty is determined by amount of far infrared powder and fly ash cenospheres;(6)The best ratio of fly ash cenospheres, ceramic beads, mesoporous silica and far infrared powder was determined as20:16:3:4, and the thermal conductivity of insulation putty prepared in accordance with the best ratio is up to0.048W/(m-K)...