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Preparation method of high-temperature-resistant aerogel thermal insulation layer material
The invention discloses a preparation method of a high-temperature-resistant aerogel heat-insulating layer material, which comprises the following steps: taking aluminum sec-butoxide as an aluminum source, taking ethanol and deionized water as solvents, and adopting an acid-base two-step catalysis method to obtain aluminum sol; the method comprises the following steps: preparing water glass by taking rice hull ash as a silicon source, and obtaining silica sol by adopting an acid-base two-step catalysis method; adding the silica sol into the aluminum sol, stirring and mixing, and adding an epoxypropane solution to obtain silicon-aluminum sol; after the silica-alumina sol becomes silica-alumina gel, carrying out aging and solvent replacement on the silica-alumina gel by using ethanol and normal hexane; and drying the silica-alumina gel by using a supercritical drying process to obtain the aerogel thermal insulation layer material. According to the present invention, the rice hull ash and the aluminum sec-butoxide are adopted as the raw materials, such that the preparation cost is low, the green environmental protection is provided, the preparation process is simple, and the prepared high-temperature-resistant aerogel thermal insulation layer material has characteristics of low density, high porosity, extremely low heat conductivity coefficient and high specific surface area, and can maintain the excellent thermal insulation ability under the 1000 DEG C high-temperature treatment.
本公开是一种耐高温气凝胶隔热层材料的制备方法，包括：以仲丁醇铝作为铝源，乙醇和去离子水作为溶剂，采用酸碱两步催化法得到铝溶胶；以稻壳灰作为硅源制备水玻璃，采用酸碱两步催化法得到硅溶胶；将硅溶胶加入到铝溶胶中，搅拌混合并加入环氧丙烷溶液得到硅铝溶胶；待硅铝溶胶变成硅铝凝胶后，采用乙醇和正己烷对硅铝凝胶进行老化和溶剂置换；使用超临界干燥工艺对硅铝凝胶进行干燥，得到气凝胶隔热层材料。利用本公开，选用稻壳灰和仲丁醇铝作为原料，制备成本较低、绿色环保，且制备过程简易，制得的耐高温气凝胶隔热层材料密度低，孔隙率高，导热系数极低且具有较高的比表面积，在1000℃高温处理下，仍保持着优异的隔热能力。
Preparation method of high-temperature-resistant aerogel thermal insulation layer material
The invention discloses a preparation method of a high-temperature-resistant aerogel heat-insulating layer material, which comprises the following steps: taking aluminum sec-butoxide as an aluminum source, taking ethanol and deionized water as solvents, and adopting an acid-base two-step catalysis method to obtain aluminum sol; the method comprises the following steps: preparing water glass by taking rice hull ash as a silicon source, and obtaining silica sol by adopting an acid-base two-step catalysis method; adding the silica sol into the aluminum sol, stirring and mixing, and adding an epoxypropane solution to obtain silicon-aluminum sol; after the silica-alumina sol becomes silica-alumina gel, carrying out aging and solvent replacement on the silica-alumina gel by using ethanol and normal hexane; and drying the silica-alumina gel by using a supercritical drying process to obtain the aerogel thermal insulation layer material. According to the present invention, the rice hull ash and the aluminum sec-butoxide are adopted as the raw materials, such that the preparation cost is low, the green environmental protection is provided, the preparation process is simple, and the prepared high-temperature-resistant aerogel thermal insulation layer material has characteristics of low density, high porosity, extremely low heat conductivity coefficient and high specific surface area, and can maintain the excellent thermal insulation ability under the 1000 DEG C high-temperature treatment.
本公开是一种耐高温气凝胶隔热层材料的制备方法，包括：以仲丁醇铝作为铝源，乙醇和去离子水作为溶剂，采用酸碱两步催化法得到铝溶胶；以稻壳灰作为硅源制备水玻璃，采用酸碱两步催化法得到硅溶胶；将硅溶胶加入到铝溶胶中，搅拌混合并加入环氧丙烷溶液得到硅铝溶胶；待硅铝溶胶变成硅铝凝胶后，采用乙醇和正己烷对硅铝凝胶进行老化和溶剂置换；使用超临界干燥工艺对硅铝凝胶进行干燥，得到气凝胶隔热层材料。利用本公开，选用稻壳灰和仲丁醇铝作为原料，制备成本较低、绿色环保，且制备过程简易，制得的耐高温气凝胶隔热层材料密度低，孔隙率高，导热系数极低且具有较高的比表面积，在1000℃高温处理下，仍保持着优异的隔热能力。
Preparation method of high-temperature-resistant aerogel thermal insulation layer material
一种耐高温气凝胶隔热层材料的制备方法
WANG FUXIE (author) / XIE JUN (author) / CHEN XIAOHONG (author) / QIN LIXIANG (author) / GUO YONG (author) / WANG RUNJIAN (author) / LU YONGQIANG (author) / HUANG LIYUAN (author) / ZHOU DAYONG (author) / WU WENMING (author)
2023-08-22
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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