SiO2气凝胶/发泡水泥复合材料的制备与性能研究

Preparation and Properties of SiO2 Aerogel/Foam Cement Composites

采用真空浸渍法制备SiO2气凝胶/发泡水泥复合材料,采用扫描电子显微镜(SEM)、傅里叶变换红外光谱仪(FTIR)、接触角测量仪等系统研究了复合材料孔结构的构成、微观结构、疏水性以及密度、力学性能、导热系数的变化。研究结果显示:SiO2气凝胶在发泡水泥表面气孔中凝胶、干燥,最终以颗粒形式填充发泡水泥孔洞;由FTIR曲线得知气凝胶在发泡水泥碱性表面凝胶、干燥后基团无明显变化;改性后发泡水泥表面疏水角为141°;浸渍后发泡水泥密度为309.4kg/m^3,抗压强度为0.56MPa,导热系数为0.046W/(m·K)。

SiO2 aerogel/foam cement composites were prepared by the vacuum impregnation method.Subsequently,the composition of pore structures,microstructure,hydrophobicity,density,mechanical properties and thermal conductivity of the composites have been systematically studied by SEM,FTIR and contact angle measuring instrument.The results show that SiO2 aerogels were gelled and dried in the surface pores of the foam cement,finally fill with foam cement pores in the form of particles;according to the F TR curve,there is no significant change in the groups of aerogels after the aerogels were gelled and dried on the alkaline surface of foam cement;the hydrophobic angle on the surface of modified foam cement is 141°;the density of the foam cement after impregnation is 309.4kg/m^3,the compressive strength is 0.56MPa,and the coefficient of thermal conductivity is 0.046W/(/m·K).