SiO_2气凝胶柔性保温隔热薄膜

SiO_2 aerogel flexible heat insulation film

由SiO2气凝胶、聚酰亚胺和镀铝层(SiO2/PI/Al)组成的柔性多层薄膜具有很好的保温隔热特性和广泛的应用前景。采用溶胶 凝胶方法制备的SiO2气凝胶具有很高的气孔率和很低的体积密度,尝试了在溶胶 凝胶过程中先酸性后碱性的二步法催化,使孔洞率提高到97%,体积密度降低为50kg/m3,成为优秀的保温隔热的主体材料。选择柔性耐温隔热的聚酰亚胺作为骨架材料,并用真空蒸发镀制上金属铝膜与多孔SiO2气凝胶复合成保温隔热薄膜。当薄膜叠加到10层时其保温隔热效果可提高5倍。

A flexible film having nice property of heat insulation and was composed of SiO_2 aerogel, polyimide (PI) and Al coating. The aerogel been catalyzed by HCl and NH_4OH in the sol-gel process. High pore ration above (97%) and density low (50kg/cm^3) will effectively raise property of heat insulation in the SiO_2 aerogel. Polyimide can be used under 300℃ and was suitable material for multi-layer insulation system as underlay which provide flexibility and mechanical intensity. The Al coating has low emissivity on the PI. It shows good adhesion and heat insulation. The property of heat insulation been increased 5 times for this multilaer SiO_2 aerogel flexible heat insulation film.