Abstract:
Based on the characteristics of rapid volume expansion caused by instantaneous vaporization of water molecules in vermiculite structural layer when exposed to heat, the industrial vermiculite was heated and expanded by microwave method and microwave chemical method to prepare expanded vermiculite with different particle sizes; The mechanical and thermal properties of expanded vermiculite/gypsum-based composite insulation board made by mold pressing and casting molding were studied; evaluate the energy-saving effect of expanded vermiculite thermal insulation material in building interior wall and thermal pipeline. The results show that The thermal insulation board made of expanded vermiculite prepared by microwave method as aggregate has lower density and thermal conductivity (0.082 W/(m·k)), and slightly higher moisture content; The density, thermal conductivity and compressive strength of expanded vermiculite/gypsum composite insulation board will decrease with the increase of expanded vermiculite sheet diameter; Under the condition that the average outdoor temperature in winter is 7℃, the energy-saving heat preservation template and pipeline heat-preservation template can save electricity by 20% stably, which have a broad application prospects in the field of building energy conservation.