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Aerogel felt and preparation method thereof
The preparation method comprises the following steps: immersing a fiber felt into a water glass solution with the pH value of 4-6, taking out the fiber felt, gelling the fiber felt, and aging the fiber felt after gelling to obtain a first wet gel felt; washing the first wet gel felt in water, suspending the first wet gel felt in n-hexane, sealing, and replacing under heating to obtain a second wet gel felt; and placing the second wet gel felt in the modification liquid, standing, and drying to obtain the aerogel felt. According to the method, part of Na < + > is brought out through water washing, and then replacement of water and residual Na < + > in the wet gel felt is achieved by means of a single-solvent one-step replacement method; according to the method, the variety and quantity of organic solvents consumed in the preparation process of the aerogel felt are greatly reduced, the preparation cost is saved, and a gel skeleton cannot be influenced and damaged. The aerogel felt with the heat conductivity coefficient of only 0.0191 W/(m.K) and the contact angle of 162 degrees is prepared from the water glass.
本发明公开了一种气凝胶毡及其制备方法，将纤维毡浸入pH为4～6的水玻璃溶液中，取出后凝胶，凝胶后老化，得到第一湿凝胶毡；将第一湿凝胶毡置于水中水洗后，使第一湿凝胶毡浮悬在正己烷中，密封，加热下置换，得到第二湿凝胶毡；将第二湿凝胶毡置于改性液中，静置，干燥，得到气凝胶毡。本发明通过水洗将部分Na+带出，然后借助单溶剂一步置换法，实现对湿凝胶毡中水和剩余Na+的置换；该方法大幅度降低了气凝胶毡制备过程消耗有机溶剂种类和数量，节省制备成本，且不会对凝胶骨架造成影响和破坏。本发明利用水玻璃制备出导热系数仅为0.0191W/(m·K)，接触角达162°的气凝胶毡。
Aerogel felt and preparation method thereof
The preparation method comprises the following steps: immersing a fiber felt into a water glass solution with the pH value of 4-6, taking out the fiber felt, gelling the fiber felt, and aging the fiber felt after gelling to obtain a first wet gel felt; washing the first wet gel felt in water, suspending the first wet gel felt in n-hexane, sealing, and replacing under heating to obtain a second wet gel felt; and placing the second wet gel felt in the modification liquid, standing, and drying to obtain the aerogel felt. According to the method, part of Na < + > is brought out through water washing, and then replacement of water and residual Na < + > in the wet gel felt is achieved by means of a single-solvent one-step replacement method; according to the method, the variety and quantity of organic solvents consumed in the preparation process of the aerogel felt are greatly reduced, the preparation cost is saved, and a gel skeleton cannot be influenced and damaged. The aerogel felt with the heat conductivity coefficient of only 0.0191 W/(m.K) and the contact angle of 162 degrees is prepared from the water glass.
本发明公开了一种气凝胶毡及其制备方法，将纤维毡浸入pH为4～6的水玻璃溶液中，取出后凝胶，凝胶后老化，得到第一湿凝胶毡；将第一湿凝胶毡置于水中水洗后，使第一湿凝胶毡浮悬在正己烷中，密封，加热下置换，得到第二湿凝胶毡；将第二湿凝胶毡置于改性液中，静置，干燥，得到气凝胶毡。本发明通过水洗将部分Na+带出，然后借助单溶剂一步置换法，实现对湿凝胶毡中水和剩余Na+的置换；该方法大幅度降低了气凝胶毡制备过程消耗有机溶剂种类和数量，节省制备成本，且不会对凝胶骨架造成影响和破坏。本发明利用水玻璃制备出导热系数仅为0.0191W/(m·K)，接触角达162°的气凝胶毡。
Aerogel felt and preparation method thereof
一种气凝胶毡及其制备方法
HOU CUILI (author) / MIAO YANG (author) / GUI LIANG (author) / MA CHAO (author) / CHEN TINGTING (author) / LIU WEIHAI (author) / XU JIE (author) / ZHANG LEI (author)
2023-07-25
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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