PET/microcrystalline graphene composite heat-conducting film and preparation method thereof
A composite material, microcrystalline graphite technology, applied in the direction of heat exchange materials, chemical instruments and methods, coatings, etc., can solve the problems of limited heat transfer, affecting thermal conductivity, low efficiency, etc., to achieve uniform lamellar structure, The effect of improving thermal conductivity and improving corrosion resistance
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Embodiment 1
[0043] The present embodiment provides a kind of preparation method of expanded graphite, specifically the following steps:
[0044] S111. Get the microcrystalline graphite raw material, the carbon content is 75%, crushing and grinding, until the particle size is 300 mesh microcrystalline graphite powder;
[0045] S112. The microcrystalline graphite powder obtained in step S111, perchloric acid and potassium permanganate are placed in the reaction device for the first chemical intercalation treatment to obtain an acidic suspension of expandable microcrystalline graphite, and the resulting expandable microcrystalline graphite The acid suspension is filtered, and the filtrate is reserved for later use. The specific steps of the first chemical intercalation are: S1121. Mix perchloric acid and microcrystalline graphite powder at a liquid-solid ratio of 20:1L / Kg and stir evenly; S1122. Add a strong oxidant according to the mass ratio of microcrystalline graphite powder to strong ox...
Embodiment 2
[0054] The present embodiment provides a kind of method using expanded graphite in embodiment 1 to prepare graphene, specifically the following steps:
[0055] S11. get the expanded microcrystalline graphite that embodiment 1 obtains;
[0056] S12. The expanded microcrystalline graphite obtained in step S11 is mixed with graphene quantum dots, diluted 5 times and then placed in an ultrasonic reaction device for 2 hours. The temperature of the ultrasonic reaction device is 50 ° C, the frequency is 25000 Hz, and the flow rate is 5.0 m 3 / h, the circulation stirring speed is 2000r / min, finally obtains the stripping material;
[0057] S13. the stripping material is press-filtered and separated in step S12, and then the graphite filter cake is collected, and the stripping liquid can be recycled;
[0058] S14. cleaning: the graphite filter cake in step S13 is used deionized water, and the number of times of cleaning is 4 times to obtain graphene.
Embodiment 3
[0068] The present embodiment provides a kind of preparation method of PET / graphene composite heat conduction film, comprises the following steps:
[0069] S1. select the graphene prepared by embodiment 2 as raw material;
[0070] S2. Place the graphene in the step S1 in a vacuum mixer, add absolute ethanol, the mass ratio of graphene and absolute alcohol is 1:60, the rotating speed of the vacuum mixer is 1800r / min, and the pressure of the stirred tank is -0.1 Mpa , stirring time is 6h, stirs to obtain graphene / ethanol mixed slurry;
[0071] S3. PET film corona: use a corona machine to corona treat PET with a thickness of 30 μm, the discharge power of the corona machine is 1.8KVA, and the speed is 150r / min;
[0072] The graphene / ethanol slurry that adopts desktop coater to be uniformly mixed is coated on the PET film that corona has been treated with the mode of hang coating, and the scraper height is 20mm;
[0073] S5. Dry the PET film coated in step S4, specifically in a v...
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