A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Method for preparing graphene heat-conducting thick film through chemical pre-reduction
The invention belongs to the technical field of graphene heat-conducting films, and relates to a method for preparing a graphene heat-conducting thick film through chemical prereduction. A graphite oxide filter cake with a large size is used as a raw material, and the graphene oxide film is obtained through high-speed shearing stripping, vacuum defoaming, blade coating film forming and room-temperature drying. Then clamping the single graphene oxide film between two porous ceramic sheets, carrying out chemical pre-reduction on the single graphene oxide film by using a chemical reducing agent, then pressing the single graphene oxide film into a thick film by using a hot press, and finally carrying out high-temperature graphitization to prepare the high-thermal-conductivity graphene thick film material. Aiming at the swelling phenomenon of a self-supporting graphene oxide film in the hydrothermal reduction process, the graphene oxide film is clamped by using a hydrophilic porous ceramic chip so as to provide additional physical support, a tidy stacking structure of sheet layers in the film is kept, and after further hot pressing and annealing, the self-supporting graphene oxide film is obtained. The heat conductivity of the prepared graphene heat-conducting thick film reaches 1220 W.m <-1 >. K <-1 >, the density reaches 2.01 g.cm <-3 >, and the thickness reaches 103 microns.
本发明属于石墨烯导热膜技术领域，涉及一种化学预还原制备石墨烯导热厚膜的方法。以尺寸较大的氧化石墨滤饼为原料，经过高速剪切剥离、真空脱泡、刮刀涂布成膜、室温干燥得到氧化石墨烯膜。接着将单片氧化石墨烯膜夹在两片多孔陶瓷片之间，利用化学还原剂对其进行化学预还原，再利用热压机压制成厚膜，最后经过高温石墨化制备出高导热的石墨烯厚膜材料。本发明针对水热还原过程中自支撑氧化石墨烯膜出现的溶胀现象，利用亲水性多孔陶瓷片夹持氧化石墨烯薄膜，以提供额外的物理支撑，保持了薄膜内部片层整齐堆叠结构，经过进一步热压与退火之后，所制备石墨烯导热厚膜热导率达1220W·m‑1·K‑1，密度达2.01g·cm‑3，厚度达103μm。
Method for preparing graphene heat-conducting thick film through chemical pre-reduction
The invention belongs to the technical field of graphene heat-conducting films, and relates to a method for preparing a graphene heat-conducting thick film through chemical prereduction. A graphite oxide filter cake with a large size is used as a raw material, and the graphene oxide film is obtained through high-speed shearing stripping, vacuum defoaming, blade coating film forming and room-temperature drying. Then clamping the single graphene oxide film between two porous ceramic sheets, carrying out chemical pre-reduction on the single graphene oxide film by using a chemical reducing agent, then pressing the single graphene oxide film into a thick film by using a hot press, and finally carrying out high-temperature graphitization to prepare the high-thermal-conductivity graphene thick film material. Aiming at the swelling phenomenon of a self-supporting graphene oxide film in the hydrothermal reduction process, the graphene oxide film is clamped by using a hydrophilic porous ceramic chip so as to provide additional physical support, a tidy stacking structure of sheet layers in the film is kept, and after further hot pressing and annealing, the self-supporting graphene oxide film is obtained. The heat conductivity of the prepared graphene heat-conducting thick film reaches 1220 W.m <-1 >. K <-1 >, the density reaches 2.01 g.cm <-3 >, and the thickness reaches 103 microns.
本发明属于石墨烯导热膜技术领域，涉及一种化学预还原制备石墨烯导热厚膜的方法。以尺寸较大的氧化石墨滤饼为原料，经过高速剪切剥离、真空脱泡、刮刀涂布成膜、室温干燥得到氧化石墨烯膜。接着将单片氧化石墨烯膜夹在两片多孔陶瓷片之间，利用化学还原剂对其进行化学预还原，再利用热压机压制成厚膜，最后经过高温石墨化制备出高导热的石墨烯厚膜材料。本发明针对水热还原过程中自支撑氧化石墨烯膜出现的溶胀现象，利用亲水性多孔陶瓷片夹持氧化石墨烯薄膜，以提供额外的物理支撑，保持了薄膜内部片层整齐堆叠结构，经过进一步热压与退火之后，所制备石墨烯导热厚膜热导率达1220W·m‑1·K‑1，密度达2.01g·cm‑3，厚度达103μm。
Method for preparing graphene heat-conducting thick film through chemical pre-reduction
一种化学预还原制备石墨烯导热厚膜的方法
BAO NINGZHONG (author) / ZHANG CHENLEI (author) / GUAN TUXIANG (author) / YAN KELAN (author)
2023-08-18
Patent
Electronic Resource
Chinese
Preparation method of graphene heat-conducting thick film
| European Patent Office | 2022
Method for continuously preparing graphene heat-conducting films
| European Patent Office | 2021
METHOD FOR CONTINUOUSLY PREPARING GRAPHENE HEAT-CONDUCTING FILMS
| European Patent Office | 2020
Manufacturing method of super-thick graphene heat-conducting radiating fin
| European Patent Office | 2022
Preparation method of graphene composite heat-conducting film
| European Patent Office | 2022