Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
High-thermal-conductivity artificial graphite film and preparation method thereof
The invention discloses a high-thermal-conductivity artificial graphite film and a preparation method thereof. The preparation method of the graphite film comprises the following steps: 1) adding hydroxyl-terminated diphenylpolysiloxane-coated aluminum oxide dispersion in or after the process of preparing a polyamide acid resin solution in order to obtain a mixed polyamide acid resin solution; 2)preparing a polyimide film from the mixed polyamide acid resin solution according to a conventional process; 3) heating the polyimide film to 500-650 DEG C in vacuum, keeping the temperature one or two or more times for 0.5 h or more each time, and raising the temperature to 1600 DEG C or less to obtain a carbonized polyimide film; and 4) heating the carbonized polyimide film to 1600-1800 DEG C under the protection of nitrogen, keeping the temperature for 0.5 h or more, and raising the temperature to 2600 DEG C or more to obtain the artificial graphite film. The problems of embrittlement, wrinkles and the like are not prone to happen in the carbonization process, the phenomenon that carbon powder is separated from the surface of the obtained graphite film is obviously reduced, and the obtained graphite film is high in density and heat conductivity coefficient.
本发明公开了一种高导热人工石墨膜及其制备方法。该石墨膜的制备方法包括：1)在制备聚酰胺酸树脂溶液过程中或制得之后，加入端羟基二苯基聚硅氧烷包覆的氧化铝分散液，得到混合聚酰胺酸树脂溶液；2)将混合聚酰胺酸树脂溶液按常规工艺制备聚酰亚胺薄膜；3)聚酰亚胺薄膜于真空下升温至500～650℃，保温一次或两次以上，每次保温≥0.5h，再升温至≤1600℃，得碳化后的聚酰亚胺薄膜；4)碳化后的聚酰亚胺薄膜在氮气保护下升温至1600～1800℃保温0.5h以上，再升温至≥2600℃，即得。本发明所述方法在碳化过程中不易发生脆裂、褶皱等问题，所得石墨膜表面脱出碳粉现象明显减少，且所得石墨膜密度和导热系数高。
High-thermal-conductivity artificial graphite film and preparation method thereof
The invention discloses a high-thermal-conductivity artificial graphite film and a preparation method thereof. The preparation method of the graphite film comprises the following steps: 1) adding hydroxyl-terminated diphenylpolysiloxane-coated aluminum oxide dispersion in or after the process of preparing a polyamide acid resin solution in order to obtain a mixed polyamide acid resin solution; 2)preparing a polyimide film from the mixed polyamide acid resin solution according to a conventional process; 3) heating the polyimide film to 500-650 DEG C in vacuum, keeping the temperature one or two or more times for 0.5 h or more each time, and raising the temperature to 1600 DEG C or less to obtain a carbonized polyimide film; and 4) heating the carbonized polyimide film to 1600-1800 DEG C under the protection of nitrogen, keeping the temperature for 0.5 h or more, and raising the temperature to 2600 DEG C or more to obtain the artificial graphite film. The problems of embrittlement, wrinkles and the like are not prone to happen in the carbonization process, the phenomenon that carbon powder is separated from the surface of the obtained graphite film is obviously reduced, and the obtained graphite film is high in density and heat conductivity coefficient.
本发明公开了一种高导热人工石墨膜及其制备方法。该石墨膜的制备方法包括：1)在制备聚酰胺酸树脂溶液过程中或制得之后，加入端羟基二苯基聚硅氧烷包覆的氧化铝分散液，得到混合聚酰胺酸树脂溶液；2)将混合聚酰胺酸树脂溶液按常规工艺制备聚酰亚胺薄膜；3)聚酰亚胺薄膜于真空下升温至500～650℃，保温一次或两次以上，每次保温≥0.5h，再升温至≤1600℃，得碳化后的聚酰亚胺薄膜；4)碳化后的聚酰亚胺薄膜在氮气保护下升温至1600～1800℃保温0.5h以上，再升温至≥2600℃，即得。本发明所述方法在碳化过程中不易发生脆裂、褶皱等问题，所得石墨膜表面脱出碳粉现象明显减少，且所得石墨膜密度和导热系数高。
High-thermal-conductivity artificial graphite film and preparation method thereof
一种高导热人工石墨膜及其制备方法
BAI XIAOQING (Autor:in) / QING SHUANGGUI (Autor:in) / MA JIXIANG (Autor:in) / LIU JIAO (Autor:in) / TANG BILIAN (Autor:in) / ZHOU FULONG (Autor:in)
17.04.2020
Patent
Elektronische Ressource
Chinesisch
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