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硅酸盐通报 ›› 2018, Vol. 37 ›› Issue (3): 1039-1046.

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气凝胶/膨胀珍珠岩的制备及其微观特征对导热性能的影响

贾冠华;刘鹏;李珠   

  1. 太原理工大学建筑与土木工程学院,太原 030024;山西大学土木工程系,太原 030013;信阳师范学院豫南非金属矿资源高效利用河南省重点实验室,信阳,464000;太原理工大学建筑与土木工程学院,太原,030024
  • 出版日期:2018-03-15 发布日期:2021-01-18
  • 基金资助:
    山西省科技攻关计划(20150313014-1)%山?魇∪瞬抛ㄏ?201605D211017)%河南省科技攻关计划(152102310361)

Preparation of Aerogel/Expanded Perlite and Effect of Its Microstructure on Thermal Conductivity

JIA Guan-hua;LIU Peng;LI Zhu   

  • Online:2018-03-15 Published:2021-01-18

摘要: 以膨胀珍珠岩为载体,采用浸渍吸附工艺将SiO2溶胶吸附于膨胀珍珠岩孔洞中,经过凝胶、老化、后处理等工艺常压干燥制备得到气凝胶/膨胀珍珠岩(AEP).探索了AEP的制备工艺参数,采用瞬态热线法和扫描电镜对AEP的导热系数和微观结构进行了测定和表征.结果表明:在膨胀珍珠岩的孔洞中能够合成结构良好的气凝胶,两者表现出很好的化学稳定性;气凝胶的填充以及对膨胀珍珠岩孔结构的改善使得AEP的导热系数比膨胀珍珠岩降低了20%~31%;溶剂置换和表面改性等后处理工艺对气凝胶在膨胀珍珠岩孔结构中的合成以及降低AEP的导热系数具有重要作用.

关键词: 气凝胶;膨胀珍珠岩;制备工艺;微观特征;导热系数

Abstract: A thermal insulation material aerogel/expanded perlite(AEP)composite was prepared by using dipping-absorbing method to absorb SiO 2hydrosol into the porous structure of expanded perlite (EP)and drying at ambient pressure after geling, ageing and post-processing.The preparation technologies of AEP were explored,and the thermal conductivity and microstructures were characterized by transient hot-wire method and scanning electron microscope respectively.The results reveal that the aerogel could be effectively synthesized in porous structure of EP, and aerogel and EP both show fairly good chemical stability.The thermal conductivity of AEP decreases by 20%-31%than EP because of the aerogel filling and adjusting the pore structures of EP.And the post-processing such as solvent replacement and surface modification are important for synthesizing the aerogel in porous structure of EP and decreasing the thermal conductivity of AEP.

Key words: aerogel;expanded perlite;preparation technology;microstructure;thermal conductivity

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