Graphene oxide powder and preparation method thereof, and graphene oxide film and preparation method thereof
A technology of graphene film and graphene powder, applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve the problems of reducing the utilization rate of raw materials, poor appearance, and increasing manufacturing costs, so as to improve utilization rate and assembly Good, cost-reducing effect
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[0063] As the first embodiment of the present invention, a preparation method of graphene oxide powder is shown, comprising the steps of: scrapping graphene oxide film scraps and defective products (such as figure 1 Shown) is dried, crushed, and pulverized to obtain graphene oxide powder.
[0064] Drying adopts blast drying oven, tunnel drying oven or vacuum drying oven. The drying temperature is 40-85°C, for example: 40°C, 41°C, 42°C, 43°C, 45°C, 48°C, 50°C, 52°C, 54°C, 56°C, 58°C, 60°C, 63°C, 65°C, 68°C, 70°C, 73°C, 75°C, 78°C, 80°C, 82°C, 84°C, 85°C, etc. The drying time is 40min-5h, for example: 40min, 50min, 1h, 1h20min, 1h30min, 2h, 2h30min, 2h50min, 3h, 3h30min, 4h, 4h20min, 4h30min, 4h50min, 5h, etc. The leftovers and defective products of graphene oxide film will be affected by air humidity in the storage environment, and the interior contains 15-20% moisture. If they are not dried, these leftovers and defective products have certain toughness and high strength. Co...
Embodiment 1A
[0085] The present embodiment has shown a kind of preparation technology of graphene oxide powder, comprises the steps:
[0086] Step 1): Dry 10 kg of graphene oxide leftovers in an electric blast oven, the drying temperature is 50° C., and the drying time is 5 hours.
[0087] Step 2): Use an electric crushing machine to crush the dried graphene oxide scraps until the D50 size of the sheet diameter is 1-3cm.
[0088] Step 3): The fragments obtained in step 2) are crushed by a cutterhead mill to obtain fragments with a diameter D50 of 2 mm; then the airflow crushing method is adopted, and the pressure of the compressed gas of the airflow crushing is 0.6 MPa, and the D50 is obtained as 30μm graphene oxide powder.
Embodiment 1B
[0090] The present embodiment has shown a kind of preparation technology of graphene oxide membrane, comprises the steps:
[0091] Step 1): The graphene oxide powder was prepared by the method of Example 1A.
[0092] Step 2): 4kg of graphene oxide powder is added to 96kg of deionized water, and stirred by a planetary mixer with a linear speed of 7m / s; after stirring, it is dispersed by a high-speed disperser of 200m / s to obtain a solid content of 4 %, the viscosity is the graphene oxide slurry of 36000mPa s;
[0093] Step 3): The graphene oxide slurry in step 2) is defoamed and coated on a substrate, the substrate is PET cloth, and the coating thickness is 2.5mm; then dried at 78°C to obtain a grammage of 100g / m 2 graphene oxide film. The SEM image of the graphene oxide film is Figure 6 As shown, it can be seen that the graphene oxide film stacks well.
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