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Preparation method of heat-preservation and heat-insulation flexible silicon dioxide aerogel
The invention belongs to the technical field of preparation of silicon dioxide aerogel, and particularly relates to a preparation method of a heat-preservation and heat-insulation flexible silicon dioxide aerogel. The preparation method comprises the following steps: (1) mixing vinyl silane, a vinyl monomer and an initiator, and reacting to obtain a silane copolymer template; (2) adding the copolymer template into water, then adding a silicon source and a surfactant, stirring and dispersing, and adjusting the pH value to obtain a silicon dioxide wet gel; and (3) adding the wet gel into an ethanol/n-hexane mixed solution, aging, adding into n-hexane, adding into a mold, and drying to obtain the blocky heat-preservation and heat-insulation flexible silicon dioxide aerogel. Silane in the copolymer template is hydrolyzed and then is crosslinked with a silicon source, so that the phenomenon that a hydrophobic group hinders the gelation process is avoided, a carbon chain in the copolymer template has a supporting effect on a gel skeleton, normal-pressure drying is facilitated, aerogel pores are guaranteed, the flexibility of the aerogel skeleton is improved through the copolymer carbon chain, and the processability of the silicon dioxide aerogel is improved.
本发明属于二氧化硅气凝胶制备的技术领域，具体涉及一种保温隔热柔性二氧化硅气凝胶的制备方法。所述制备方法包括：（1）将乙烯基硅烷、乙烯基单体、引发剂混合后反应得到硅烷共聚物模板；（2）将共聚物模板加入到水中，然后加入硅源、表面活性剂，搅拌分散，调节pH，得到二氧化硅湿凝胶；（3）将湿凝胶加入到乙醇/正已烷混合液中老化再加入到正已烷中后，加入模具，干燥，即得块状的保温隔热柔性二氧化硅气凝胶。通过共聚物模板中的硅烷水解后与硅源交联，避免了疏水基团阻碍凝胶的过程，共聚物模板中的碳链对凝胶骨架有支撑作用，有利于常压干燥保证气凝胶孔隙，共聚物碳链使气凝胶骨架柔性增加，提高了二氧化硅气凝胶可加工性。
Preparation method of heat-preservation and heat-insulation flexible silicon dioxide aerogel
The invention belongs to the technical field of preparation of silicon dioxide aerogel, and particularly relates to a preparation method of a heat-preservation and heat-insulation flexible silicon dioxide aerogel. The preparation method comprises the following steps: (1) mixing vinyl silane, a vinyl monomer and an initiator, and reacting to obtain a silane copolymer template; (2) adding the copolymer template into water, then adding a silicon source and a surfactant, stirring and dispersing, and adjusting the pH value to obtain a silicon dioxide wet gel; and (3) adding the wet gel into an ethanol/n-hexane mixed solution, aging, adding into n-hexane, adding into a mold, and drying to obtain the blocky heat-preservation and heat-insulation flexible silicon dioxide aerogel. Silane in the copolymer template is hydrolyzed and then is crosslinked with a silicon source, so that the phenomenon that a hydrophobic group hinders the gelation process is avoided, a carbon chain in the copolymer template has a supporting effect on a gel skeleton, normal-pressure drying is facilitated, aerogel pores are guaranteed, the flexibility of the aerogel skeleton is improved through the copolymer carbon chain, and the processability of the silicon dioxide aerogel is improved.
本发明属于二氧化硅气凝胶制备的技术领域，具体涉及一种保温隔热柔性二氧化硅气凝胶的制备方法。所述制备方法包括：（1）将乙烯基硅烷、乙烯基单体、引发剂混合后反应得到硅烷共聚物模板；（2）将共聚物模板加入到水中，然后加入硅源、表面活性剂，搅拌分散，调节pH，得到二氧化硅湿凝胶；（3）将湿凝胶加入到乙醇/正已烷混合液中老化再加入到正已烷中后，加入模具，干燥，即得块状的保温隔热柔性二氧化硅气凝胶。通过共聚物模板中的硅烷水解后与硅源交联，避免了疏水基团阻碍凝胶的过程，共聚物模板中的碳链对凝胶骨架有支撑作用，有利于常压干燥保证气凝胶孔隙，共聚物碳链使气凝胶骨架柔性增加，提高了二氧化硅气凝胶可加工性。
Preparation method of heat-preservation and heat-insulation flexible silicon dioxide aerogel
一种保温隔热柔性二氧化硅气凝胶的制备方法
CHEN QING (author) / CHEN QIAOHE (author) / SI WENBIN (author) / CHEN TAO (author) / HE FANG (author)
2020-06-30
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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