Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Method for preparing carbon aerogel composite material with ultralow density and ultralow thermal conductivity through cotton fiber surface functionalization
The invention discloses a method for preparing a carbon aerogel composite material with ultralow density and ultralow thermal conductivity through cotton fiber surface functionalization, and belongs to the field of carbon aerogel preparation. Resorcinol and formaldehyde are used as reaction monomers, sodium carbonate is used as a catalyst, deionized water is used as a solvent, cotton fibers are used as a reinforcement body, hydrogen peroxide is used as a cotton fiber treatment solution, the prepared reaction solution is used for dipping the cotton fiber reinforcement body, and then gelation, aging, drying and carbonization are performed to obtain the carbon aerogel composite material. According to the invention, the pretreated cotton fiber is used as a reinforcement body, so that a reaction monomer can be attached to the surface of the cotton fiber to nucleate and grow under extremely low sol concentration, and develops into a rich three-dimensional gel network; after pyrolysis, synergistic shrinkage of the cotton fiber reinforcement and the phenolic aldehyde matrix in the carbonization process can be realized, the general problem that the thermal conductivity of the composite material is remarkably increased due to introduction of fibers is avoided, and synthesis of ultra-low-thermal-conductivity, crack-free and large-size sample pieces is facilitated.
本发明公开了一种通过棉花纤维表面官能化实现超低密度、超低热导炭气凝胶复合材料的制备方法，属于炭气凝胶制备领域。本发明以间苯二酚、甲醛为反应单体，碳酸钠为催化剂，去离子水为溶剂，棉花纤维为增强体，过氧化氢为棉花纤维处理液，将配制好的反应溶液浸渍处理棉花纤维增强体后，经凝胶、老化、干燥、碳化得到炭气凝胶复合材料。本发明采用预处理后棉花纤维作为增强体，可使反应单体在极低溶胶浓度下依附棉花纤维表面形核、长大，并发展成丰富的三维凝胶网络；热解后可实现棉花纤维增强体与酚醛基体在碳化过程中的协同收缩，避免由于纤维的引入使复合材料热导率显著增加的普遍问题，有利于超低热导、无裂纹、大尺寸样件的合成。
Method for preparing carbon aerogel composite material with ultralow density and ultralow thermal conductivity through cotton fiber surface functionalization
The invention discloses a method for preparing a carbon aerogel composite material with ultralow density and ultralow thermal conductivity through cotton fiber surface functionalization, and belongs to the field of carbon aerogel preparation. Resorcinol and formaldehyde are used as reaction monomers, sodium carbonate is used as a catalyst, deionized water is used as a solvent, cotton fibers are used as a reinforcement body, hydrogen peroxide is used as a cotton fiber treatment solution, the prepared reaction solution is used for dipping the cotton fiber reinforcement body, and then gelation, aging, drying and carbonization are performed to obtain the carbon aerogel composite material. According to the invention, the pretreated cotton fiber is used as a reinforcement body, so that a reaction monomer can be attached to the surface of the cotton fiber to nucleate and grow under extremely low sol concentration, and develops into a rich three-dimensional gel network; after pyrolysis, synergistic shrinkage of the cotton fiber reinforcement and the phenolic aldehyde matrix in the carbonization process can be realized, the general problem that the thermal conductivity of the composite material is remarkably increased due to introduction of fibers is avoided, and synthesis of ultra-low-thermal-conductivity, crack-free and large-size sample pieces is facilitated.
本发明公开了一种通过棉花纤维表面官能化实现超低密度、超低热导炭气凝胶复合材料的制备方法，属于炭气凝胶制备领域。本发明以间苯二酚、甲醛为反应单体，碳酸钠为催化剂，去离子水为溶剂，棉花纤维为增强体，过氧化氢为棉花纤维处理液，将配制好的反应溶液浸渍处理棉花纤维增强体后，经凝胶、老化、干燥、碳化得到炭气凝胶复合材料。本发明采用预处理后棉花纤维作为增强体，可使反应单体在极低溶胶浓度下依附棉花纤维表面形核、长大，并发展成丰富的三维凝胶网络；热解后可实现棉花纤维增强体与酚醛基体在碳化过程中的协同收缩，避免由于纤维的引入使复合材料热导率显著增加的普遍问题，有利于超低热导、无裂纹、大尺寸样件的合成。
Method for preparing carbon aerogel composite material with ultralow density and ultralow thermal conductivity through cotton fiber surface functionalization
通过棉花纤维表面官能化实现超低密度、超低热导炭气凝胶复合材料的制备方法
TANG SUFANG (Autor:in) / YANG JIA (Autor:in) / LI JIAN (Autor:in) / SUN BOHUI (Autor:in) / PANG SHENGYANG (Autor:in) / HU CHENGLONG (Autor:in)
02.09.2022
Patent
Elektronische Ressource
Chinesisch
| Europäisches Patentamt | 2022
| Europäisches Patentamt | 2022
| Europäisches Patentamt | 2022
Ultralow density carbon aerogels with low thermal conductivity up to 2000^oC
| British Library Online Contents | 2011