Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
High-thermal-conductivity polyimide composite graphite film and preparation method thereof
The invention provides a high-thermal-conductivity polyimide composite graphite film and a preparation method thereof. According to the composite film, polyimide prepared through chemical imidization is used as a matrix, and surface modified carbon nanotubes are used as a dispersion phase. The preparation method comprises the following steps: carrying out surface coupling agent modification on carbon nanotubes, ultrasonically dispersing the carbon nanotubes in an organic solvent, sequentially adding diamine and dianhydride, carrying out a mechanical stirring polymerization reaction to obtain a polyamide acid/carbon nanotube mixed solution, then adding a catalyst pyridine/propionic anhydride mixture into a PAA solution, stirring at room temperature for 5 minutes, and carrying out cooling to room temperature so as to obtain the polyamide acid/carbon nanotube composite material. The solutions are then poured on clean glass, treated at 90 DEG C for 30 minutes, the membrane is separated from the glass plate, and treated at 150-230 DEG C for 5-30 minutes. Then the polyimide composite film is subjected to carbonization and graphitization treatment in sequence, nitrogen protection is used in the carbonization process, argon protection is used in the graphitization process, and the polyimide composite graphite film obtained through the method is high in graphitization degree and has excellent transverse and longitudinal heat conduction performance.
本发明提供了一种高导热的聚酰亚胺复合石墨膜及其制备方法。本发明中复合薄膜以化学亚胺化制备的聚酰亚胺为基体，以表面改性碳纳米管为分散相。本发明通过将碳纳米管进行表面偶联剂改性，超声分散在有机溶剂中，相继加入二胺和二酐，机械搅拌聚合反应，得到聚酰胺酸/碳纳米管混合液，随后，将催化剂吡啶/丙酸酐混合物加入到PAA溶液中，在室温下搅拌5分钟，然后将这些溶液浇注在干净玻璃上，在90°C下处理30分钟，将膜从玻璃板分离，在150~230°C下处理5~30分钟。随后将聚酰亚胺复合膜先后进行碳化和石墨化处理，碳化过程利用氮气保护，石墨化过程用氩气保护，本发明得到的聚酰亚胺复合石墨膜石墨化程度高，具有优异的横向和纵向导热性能。
High-thermal-conductivity polyimide composite graphite film and preparation method thereof
The invention provides a high-thermal-conductivity polyimide composite graphite film and a preparation method thereof. According to the composite film, polyimide prepared through chemical imidization is used as a matrix, and surface modified carbon nanotubes are used as a dispersion phase. The preparation method comprises the following steps: carrying out surface coupling agent modification on carbon nanotubes, ultrasonically dispersing the carbon nanotubes in an organic solvent, sequentially adding diamine and dianhydride, carrying out a mechanical stirring polymerization reaction to obtain a polyamide acid/carbon nanotube mixed solution, then adding a catalyst pyridine/propionic anhydride mixture into a PAA solution, stirring at room temperature for 5 minutes, and carrying out cooling to room temperature so as to obtain the polyamide acid/carbon nanotube composite material. The solutions are then poured on clean glass, treated at 90 DEG C for 30 minutes, the membrane is separated from the glass plate, and treated at 150-230 DEG C for 5-30 minutes. Then the polyimide composite film is subjected to carbonization and graphitization treatment in sequence, nitrogen protection is used in the carbonization process, argon protection is used in the graphitization process, and the polyimide composite graphite film obtained through the method is high in graphitization degree and has excellent transverse and longitudinal heat conduction performance.
本发明提供了一种高导热的聚酰亚胺复合石墨膜及其制备方法。本发明中复合薄膜以化学亚胺化制备的聚酰亚胺为基体，以表面改性碳纳米管为分散相。本发明通过将碳纳米管进行表面偶联剂改性，超声分散在有机溶剂中，相继加入二胺和二酐，机械搅拌聚合反应，得到聚酰胺酸/碳纳米管混合液，随后，将催化剂吡啶/丙酸酐混合物加入到PAA溶液中，在室温下搅拌5分钟，然后将这些溶液浇注在干净玻璃上，在90°C下处理30分钟，将膜从玻璃板分离，在150~230°C下处理5~30分钟。随后将聚酰亚胺复合膜先后进行碳化和石墨化处理，碳化过程利用氮气保护，石墨化过程用氩气保护，本发明得到的聚酰亚胺复合石墨膜石墨化程度高，具有优异的横向和纵向导热性能。
High-thermal-conductivity polyimide composite graphite film and preparation method thereof
一种高导热的聚酰亚胺复合石墨膜及其制备方法
MIN YONGGANG (Autor:in) / ZHANG SHIYANG (Autor:in) / LU XIAOCHUANG (Autor:in) / LIU YIDONG (Autor:in)
06.08.2024
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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