Carbon nanotube/graphene/polymer electromagnetic shielding material, preparation method and application thereof
An electromagnetic shielding material, carbon nanotube technology, applied in the direction of magnetic/electric field shielding, electrical components, etc., can solve the problems of high density, easy to be corroded and oxidized, and achieve the effect of broad application prospects.
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[0034] As an aspect of the technical solution of the present invention, what it relates to is a kind of preparation method of flexible carbon nanotube / graphene / polymer electromagnetic shielding material, which comprises:
[0035] Filtrating the mixed dispersion liquid containing graphene and oxidized carbon nanotubes to obtain oxidized carbon nanotubes / graphene composites with a three-dimensional structure;
[0036] In a protective atmosphere, the oxidized carbon nanotube / graphene composite is calcined at a high temperature to obtain a three-dimensional carbon nanotube / graphene composite; and
[0037] The three-dimensional carbon nanotube / graphene composite is impregnated with a high molecular polymer precursor, and then cured to obtain a carbon nanotube / graphene / polymer electromagnetic shielding material.
[0038] In some more specific embodiments, the preparation method includes: uniformly dispersing graphene and oxidized carbon nanotubes in water by ultrasonic dispersion to...
Embodiment 1
[0082] (1) Weigh 10 mg of oxidized multi-walled carbon nanotubes and add them to 50 mL of water, after ultrasonic dispersion for 15 minutes, weigh 0.19 g of graphene and add them and continue ultrasonic dispersion for 15 minutes;
[0083] (2) Suction filtration of the dispersion liquid under a vacuum condition of 2000 Pa to obtain a three-dimensional oxidized multi-walled carbon nanotube / graphene composite. The polytetrafluoroethylene filter membrane has a pore size of 0.05 μm and a diameter of 50 mm. In order to keep the structure of the oxidized multi-walled carbon nanotube / graphene composite, the sand core filter head and the filter cup in the suction filtration device are placed in an oven at 60°C to dry;
[0084](3) The dried oxidized multi-walled carbon nanotubes / graphene composite was heated at 20 °C min in an argon atmosphere. -1 The heating rate was raised to 1000°C and maintained for 2 hours to obtain a three-dimensional multi-walled carbon nanotube / graphene composi...
Embodiment 2
[0088] (1) Add 5 mg of oxidized multi-walled carbon nanotubes to 40 mL of water and ultrasonically disperse for 10 min, then weigh 0.195 g of graphene and add it and continue ultrasonically dispersing for 10 min;
[0089] (2) Suction-filtering the above-mentioned dispersion liquid under a vacuum condition of 3000 Pa to obtain a three-dimensional oxidized multi-walled carbon nanotube / graphene composite. The polytetrafluoroethylene filter membrane has a pore size of 0.05 μm and a diameter of 50 mm, and then puts the sand core filter head and the filter cup in the suction filtration device together in an oven at 70° C. for drying;
[0090] (3) The above compound was heated at 10°C min in an argon atmosphere. -1 The heating rate was raised to 800°C and maintained for 4 hours to obtain a composite of graphene-supported multi-walled carbon nanotubes;
[0091] (4) The above-mentioned compound after calcining is uniformly mixed with 3.5g of polydimethylsiloxane monomer and 0.35g of c...
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