Preparation And Properties Study Of Expanded Perlite Insulation Board

With population increasing and resource scarcity, China paid more and more attention to energy conservation and emission reduction. While building energy consumption accounts for about half of social energy, its effective utilization is of great significance and plays an important role in energy conservation and emission reduction project. In recent years, the fires caused by exterior thermal insulation wall material emerged in endlessly, which caused more and more attention. Depending on the good performance of light weight, heat insulation, sound-absorption, non-toxicity, non-combustion, and odorlessness of expanded perlite, expanded perlite insulation boards were prepared with expanded perlite as the main material, which have good building energy efficiency and fire prevention property.In this study, expanded perlite insulation board was prepared with three different binders and the synthesizing process was detailed as follows.Aluminum dihydrogen phosphate expanded perlite insulation board was prepared with aluminum dihydrogen phosphate as a binder, expanded perlite as an aggregate, and fly ash as an additive. According to the first round of a single factor experiment, L9(34) orthogonal experiment, and the second round of a single factor experiment, the optimum technological parameters were determined. The optimum briquetting pressure, the mass of fly ash and expanded perlite vs that of aluminum dihydrogen phosphate solution, calcination temperature and calcination time were 1.0 MPa,1:1, 500℃ and 1h, respectively. The combination properties of adding 10% fly ash were the best in the synthesized samples, and its compressive strength, thermal conductivity, and density were 0.46 MPa,0.082 W/(m K), and 259 kg/m3, respectively.Calcium lime expanded perlite insulation board was prepared with calcium lime as a binder, expanded perlite as an aggregate, and fly ash as an additive. The combination properties of adding 30% calcium lime were the best in the synthesized samples, and its compressive strength, thermal conductivity, and density were 0.34 Mpa,0.084 W/(m K), and 284 kg/m3, respectively.Water glass expanded perlite insulation board was prepared with water glass as a binder, expanded perlite as an aggregate, and fly ash and KOH as additives. According to L16(45) orthogonal experiment, the optimum technological parameters were determined. The optimum calcination temperature was 500℃, calcination time was 1h, the mass ratio of fly ash and expanded perlite was 1:10, the mass ratio of expanded perlite and water glass was 2:1, the mass ratio of KOH and water glass was 1:3. The compressive strength, thermal conductivity, and density of water glass expanded perlite insulation board, which was prepared at the optimum technological parameter, were 0.47 MPa,0.071 W/(m K), and 257 kg/m3, respectively.The XRD and SEM results of the products indicated that mullite phase was present in the products, and the gas gaps in the products got smaller after fly ash being added. All the changes led to the strength of the products increased, while the thermal insulation performance declension. The combination properties of the products were satisfied the requirement of the national standards No.350 Qualified of expanded perlite insulation products.