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Characterization of commercial aerogel-enhanced blankets obtained with supercritical drying and of a new ambient pressure drying blanket

机译：具有超临界干燥和新型环境压力干燥毯子获得的商用气凝胶增强毯的特征

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摘要

Aerogel-enhanced products are often seen as promising materials for providing significant thermal resistance with reduced thickness. In particular, aerogel-enhanced blankets have already shown their effectiveness in several building retrofitting projects. In aerogel-enhanced blankets, a fiber matrix supports the aerogel structure, compensating for the poor mechanical properties of the aerogels. While an increasing body of literature has presented the characterization of specific aerogel-enhanced blankets, no study has so far compared the several commercially-available products. This paper reports the characterization of common aerogel-enhanced blankets produced with supercritical drying (SCD) and of one product produced with ambient pressure drying (APD) by the authors. The different aerogel-enhanced blankets are compared for their bulk density, BET surface area, hydrophilic behavior, chemical composition, and thermal conductivity. IR spectroscopy and contact angle analysis provide insight regarding the hydrophobicity of each blanket. SEM and BET surface area analyses allow to identify structural differences in the blanket filaments and in the binding mechanism of the aerogel to these filaments. The findings provide valuable insight into the differences among products. For example, the thermal conductivity tests confirm the superior performance of aerogel-enhanced blankets compared to traditional insulating materials, but they reveal the temperature dependency of their thermal conductivity and some differences among manufacturer-declared and experimentally-obtained values. The literature review and the experimental comparison between the SCD and APD blankets reveals that only some products are able to achieve extremely low thermal conductivities using APD, with a value around 0.016W/mK, while blankets using an SCD process show thermal conductivity values lower than 0.02 W/mK more consistently. Crown Copyright (C) 2019 Published by Elsevier B.V. All rights reserved.
机译：气凝胶增强的产品通常被视为具有厚度减小的显着热阻的有希望的材料。特别是，气凝胶增强的毯子已经在几个建筑改造项目中显示了它们的有效性。在气凝胶增强毯中，纤维基质支持气凝胶结构，补偿气凝胶的机械性能差。虽然越来越多的文献已经提出了特定的气凝胶增强毯的表征，但到目前为止还没有研究进行了几种商业上可用的产品。本文报道了具有超临界干燥（SCD）和由作者用环境压力干燥（APD）产生的一种产品生产的共同气凝胶增强橡皮布的表征。将不同的气凝胶增强橡皮轮与其堆积密度，BET表面积，亲水性，化学成分和导热率进行比较。 IR光谱和接触角分析提供了关于每个毯子的疏水性的洞察力。 SEM和BET表面积分析允许识别橡皮布细丝的结构差异以及气凝胶的结合机制到这些长丝。调查结果为产品的差异提供了有价值的洞察力。例如，与传统的绝缘材料相比，导热性试验确认了气凝胶增强毯的优异性能，但它们揭示了其导热系数的温度依赖性以及制造商声明和实验所获得的值之间的一些差异。 SCD和APD橡皮布之间的文献综述和实验比较显示，只有一些产品能够使用APD实现极低的热导率，值约为0.016W / MK，而使用SCD过程的毯子显示出低于的导热率值0.02 w / mk更一致。皇家版权（c）2019由elestvier b.v出版。保留所有权利。

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