期刊
ADVANCED POWDER TECHNOLOGY
卷 32, 期 6, 页码 1891-1901出版社
ELSEVIER
DOI: 10.1016/j.apt.2021.03.041
关键词
Hydrophobic silica aerogels; Magnesium hydroxide; Flammability; Thermal analysis; Flame-retardant mechanism
资金
- National Natural Science Foundation of China [51904336]
- Natural Science Foundation of Hunan Province [2020JJ4714]
- Fundamental Research Funds for the Central Universities [202501003, 202045001]
- Innovation-Driven Project of Central South University [2018CX025]
- Fundamental Research Funds for Central Universities of the Central South University [2020zzts704]
A facile post-doping of magnesium hydroxide is proposed to improve the flame retardancy of hydrophobic silica aerogels, maintaining low tap density and thermal conductivity while enhancing thermal stability. The improved flame retardancy is attributed to the thermal decomposition of MH, pyrolysis products, and reaction between MgO and SiO2.
A facile post-doping of magnesium hydroxide (MH) is proposed to improve the flame retardancy of hydrophobic silica aerogels (SA). The lower tap density (0.12 g/cm(3)) and thermal conductivity (26 mW/m/K) are still maintained at the largest MH content of 20%. Meanwhile, the gross calorific value of the SA/MH is reduced by 15% and the thermal stability is improved to over similar to 545 degrees C. The SA/MH pyrolysis process can be divided into four stages, while the hydrophobic SA is a two-stage pyrolysis process. Furthermore, the improved flame retardancy of SA/MH is mainly attributed to the thermal decomposition of MH, the pyrolysis products (MgO, SiO2 and H2O) and the reaction between MgO and SiO2. The research outcomes demonstrate the validity of using MH as dopant to improve the flame retardancy of hydrophobic SA by a facile post-doping, which is beneficial to the expansion of hydrophobic SA in their practical thermal insulation application. (C) 2021 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.
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