含SiO2气凝胶粉煤灰基发泡地质聚合物的性能及微

关键字：SiO2气凝胶,粉煤灰基地质聚合物,发泡,保温材料

[中国矿业大学（北京） 化学与环境工程学院，北京  100083]

    摘要：以SiO2气凝胶（AG）、粉煤灰（CFA）、钠水玻璃和氢氧化钠为主要原料，双氧水（H2O2）为发泡剂，制备AG-CFA基发泡地质聚合物（ACFG）。通过调节AG掺量（0～8%）和H2O2掺量（3%～5%），研究不同变量对ACFG表观密度、导热系数、力学性能和微观形貌的影响。结果表明：当体系中AG或H2O2掺量增多时，ACFG的表观密度和导热系数降低，而抗压和抗折强度能保持较高的数值；当AG掺量为8%，H2O2掺量为5%时，ACFG在28 d时的表观密度为185 kg/m3，导热系数为0.058 W/（m·K），抗压和抗折强度分别为0.55、0.62 MPa。
    关键词：SiO2气凝胶；粉煤灰基地质聚合物；发泡；保温材料
    中图分类号：TU55+1        文献标识码：A        文章编号：1001-702X（2017）07-0115-04

Study on microstructure and properties of SiO2 aerogel blended coal fly ash-based foam geopolymer
CUI Yong，LI Duanle，LIU Ze，WANG Dongmin，WANG Fujie      
（School of Chemical and Environmental Engineering，China University of Mining and Technology，Beijing 100083，China）

    Abstract：AG-CFA based foam geopolymer（ACFG） was prepared by taking SiO2 aerogel（AG），coal fly ash（CFA），sodium water glass，and sodium hydroxide as raw materials，and hydrogen peroxide solution（H2O2） as foaming agent. The effect of AG（0～8%）and H2O2（3%～5%） contents on the apparent density，thermal conductivity，strength，and microstructure of foam geopolymer was investigated. The results show that with the increasing of AG and H2O2，apparent densities and thermal conductivity decreased gradually. Meanwhile，the compressive and flexural strength maintain relative high values. When the content of AG was 8% and the content of H2O2 was 5%，apparent density，thermal conductivity，compressive strength and flexural strength of ACFG at 28 d were 185 kg/m3，0.058 W/（m·K），0.55 MPa and 0.62 MPa respectively.
    Key words：SiO2 aerogel，coal fly ash based geopolymer，foam，thermal insulation material