偏高岭土制备外墙保温材料试验

市场上现有无机保温材料导热系数低、保温性能差，为此，以偏高岭土为主要原料、水玻璃为碱激发剂、双氧水为发泡剂，通过聚合反应制备新型外墙保温材料，考察水玻璃用量、发泡剂用量和养护温度对保温材料密度、抗压强度和导热系数的影响。结果表明：当水玻璃与偏高岭土质量比为1.0、双氧水用量为偏高岭土质量的2%、养护温度为60 ℃时，获得的保温材料导热系数为0.115 W/(m·℃)、密度为356 kg/m3、抗压强度为0.821 MPa。试验结果可以为偏高岭土制备外墙保温材料工艺提供技术支持。

Experiment on Preparation of Exterior Thermal Insulation Materials Using Metakaolin

Existing inorganic thermal insulation materials in market has low thermal conductivity,heat preservation per-formance is poor,therefore,using metakaolin as the main raw material,sodium silicate as alkali excitation agent,aquae hydroge-nii dioxidi as foaming agent,through polymerization preparation new exterior wall thermal insulation material. Influence of dos-age of sodium silicate,dosage of foaming agent and curing temperature on the thermal insulation material density,compressive strength and coefficient of thermal conductivity were investigated. Results show that when mass ratio of sodium silicate to metakaolin is 1. 0,aquae hydrogenii dioxidi dosage of 2% mass of metakaolin,curing temperature was 60 ℃,the thermal insu-lation materials coefficient of thermal conductivity is 0. 115 W/( m ℃) , density of 356 kg/m3 , the compressive strength of 0. 821 MPa. Experimental results can provide technical support for preparation of exterior wall thermal insulation material using metakaolin.