Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Preparation method of high-temperature-resistant flexible attapulgite composite aerogel
The invention discloses a preparation method of high-temperature-resistant flexible attapulgite composite aerogel. The composite aerogel is composed of attapulgite, ultra-long nano hydroxyapatite fibers and silicon dioxide. The preparation method comprises the steps of adding attapulgite clay into acidic silicon dioxide sol, uniformly dispersing at a high speed, then adding the super-long nano hydroxyapatite fibers, uniformly dispersing at a low speed, and adjusting the pH value to obtain the gel; and carrying out vacuum freeze drying on the gel to obtain the corresponding flexible attapulgite composite aerogel. The pore size distribution of the composite aerogel is 20-800 nm, the BET specific surface area is up to 300-1000 m < 2 >. G <-1 >, the apparent density is 0.08-0.25 g. cm <-3 >, the normal-temperature heat conductivity is 0.02-0.05 W. m <-1 >. k <-1 >, the compression modulus is 0.01-1.5 MPa, the composite aerogel has flexibility, can be bent and can resist the high temperature of 1000 DEG C, and the heat conductivity at the temperature of 1000 DEG C is 0.10-0.15 W.m <-1 >. k <-1 >. The attapulgite composite aerogel prepared by the method is good in flexibility, low in density, low in heat conductivity and resistant to high temperature; and the preparation process is simple, green and environment-friendly. The composite aerogel can be applied to the fields of building heat preservation, high-temperature heat insulation and the like.
本发明公开了一种耐高温柔性凹凸棒石复合气凝胶的制备方法，该复合气凝胶由凹凸棒石、超长纳米羟基磷灰石纤维、二氧化硅组成，其制备方法是在酸性二氧化硅溶胶中加入凹凸棒石粘土高速分散均匀，然后加入超长纳米羟基磷灰石纤维低速分散均匀，再调节pH得到凝胶。将凝胶进行真空冷冻干燥得到相应的柔性凹凸棒石复合气凝胶。该复合气凝胶孔径分布为20~800 nm，BET比表面积高达300~1000 m2·g‑1，表观密度为0.08~0.25 g·cm‑3，常温热导率为0.02~0.05 W·m‑1·k‑1，压缩模量为0.01~1.5 MPa，具有柔性，可以弯曲，可耐1000℃高温，且1000℃的热导率为0.10~0.15 W·m‑1·k‑1。本发明制备的凹凸棒石复合气凝胶柔韧性好，密度低，热导率低，耐高温；制备工艺简单，绿色环保。该复合气凝胶可应用于建筑保温、高温隔热等领域。
Preparation method of high-temperature-resistant flexible attapulgite composite aerogel
The invention discloses a preparation method of high-temperature-resistant flexible attapulgite composite aerogel. The composite aerogel is composed of attapulgite, ultra-long nano hydroxyapatite fibers and silicon dioxide. The preparation method comprises the steps of adding attapulgite clay into acidic silicon dioxide sol, uniformly dispersing at a high speed, then adding the super-long nano hydroxyapatite fibers, uniformly dispersing at a low speed, and adjusting the pH value to obtain the gel; and carrying out vacuum freeze drying on the gel to obtain the corresponding flexible attapulgite composite aerogel. The pore size distribution of the composite aerogel is 20-800 nm, the BET specific surface area is up to 300-1000 m < 2 >. G <-1 >, the apparent density is 0.08-0.25 g. cm <-3 >, the normal-temperature heat conductivity is 0.02-0.05 W. m <-1 >. k <-1 >, the compression modulus is 0.01-1.5 MPa, the composite aerogel has flexibility, can be bent and can resist the high temperature of 1000 DEG C, and the heat conductivity at the temperature of 1000 DEG C is 0.10-0.15 W.m <-1 >. k <-1 >. The attapulgite composite aerogel prepared by the method is good in flexibility, low in density, low in heat conductivity and resistant to high temperature; and the preparation process is simple, green and environment-friendly. The composite aerogel can be applied to the fields of building heat preservation, high-temperature heat insulation and the like.
本发明公开了一种耐高温柔性凹凸棒石复合气凝胶的制备方法，该复合气凝胶由凹凸棒石、超长纳米羟基磷灰石纤维、二氧化硅组成，其制备方法是在酸性二氧化硅溶胶中加入凹凸棒石粘土高速分散均匀，然后加入超长纳米羟基磷灰石纤维低速分散均匀，再调节pH得到凝胶。将凝胶进行真空冷冻干燥得到相应的柔性凹凸棒石复合气凝胶。该复合气凝胶孔径分布为20~800 nm，BET比表面积高达300~1000 m2·g‑1，表观密度为0.08~0.25 g·cm‑3，常温热导率为0.02~0.05 W·m‑1·k‑1，压缩模量为0.01~1.5 MPa，具有柔性，可以弯曲，可耐1000℃高温，且1000℃的热导率为0.10~0.15 W·m‑1·k‑1。本发明制备的凹凸棒石复合气凝胶柔韧性好，密度低，热导率低，耐高温；制备工艺简单，绿色环保。该复合气凝胶可应用于建筑保温、高温隔热等领域。
Preparation method of high-temperature-resistant flexible attapulgite composite aerogel
一种耐高温柔性凹凸棒石复合气凝胶的制备方法
HU YUANYUAN (Autor:in) / LI YUBAO (Autor:in) / JIANG XIAOMEI (Autor:in) / GU YAWEI (Autor:in) / DAI CHENYE (Autor:in) / YUN SHAN (Autor:in) / CHEN JING (Autor:in)
23.11.2021
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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