Multilayer electromagnetic shielding composite material based on isolation structure and preparation method and application thereof
A composite material and electromagnetic shielding technology, which is applied in the fields of magnetic/electric field shielding, chemical instruments and methods, lamination, etc., can solve problems such as the mismatch between composite materials and air impedance, the reduction of mechanical properties of composite materials, and the inability to meet practical applications. Achieve the effects of improving shielding efficiency, high electromagnetic shielding effectiveness, and excellent mechanical properties
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[0087] The invention provides a method for preparing an electromagnetic shielding composite material, comprising the following steps:
[0088] 1) Mix the filler A with the solvent, then add the filler B to continue mixing, then add ferric chloride, alkali and hydrazine hydrate and mix again, then react to obtain the modified filler;
[0089] 2) Stir and mix the modified filler and resin obtained in the above steps, and then perform hot pressing to obtain a modified resin layer with an isolation structure;
[0090] 3) Composite the metal nanowire dispersion after plasma treatment on the modified resin layer with an isolation structure to obtain an electromagnetic shielding composite material.
[0091] In the present invention, the selection and composition of raw materials required in the above-mentioned preparation process, as well as the corresponding optimization principles, can correspond to the selection and composition of the corresponding raw materials in the aforementio...
Embodiment 1
[0139] 1) Preparation of modified filler:
[0140] First, add 1 g of graphene nanosheets to methanol for ultrasonic dispersion for 3 h, then add 1 g of graphene oxide, continue ultrasonication for 3 h, add 30 g of ferric chloride, 150 g of sodium hydroxide and 3.75 g of hydrazine hydrate to the above dispersion Stirring for 4 hours, the above mixture was transferred to an autoclave and treated at 200°C for 16 hours. Finally, filter and wash after cooling down to room temperature, and dry at 120°C to obtain the final modified filler.
[0141] 2) Absorption layer preparation:
[0142] Weigh 7g of polyethylene resin and 3g of modified filler in a mixer, stir and mix, and then hot press at 140°C and 1MPa pressure to obtain a 200um film, namely the absorbing layer.
[0143] 3) Absorption / reflection layer preparation:
[0144] Silver nanowires (length: 50um; diameter: 50nm) were dispersed in ethanol at a concentration of 10mg / ml, and the obtained film was treated with plasma for ...
Embodiment 2
[0157] 1) Preparation of modified filler:
[0158] First, add 1g of flake graphite into ethanol and ultrasonically disperse for 1h, then add 0.5g of acidified carbon nanotubes, continue ultrasonication for 1h, add 5g of ferric chloride, 15g of potassium hydroxide and 0.625g of hydrazine hydrate into the above dispersion and stir 2h, the above mixed solution was transferred to an autoclave, and treated at 160°C for 8h. Finally, filter and wash after cooling down to room temperature, and dry at 80°C to obtain the final modified filler.
[0159] 2) Absorption layer preparation:
[0160] Weigh 9g of polypropylene and 1g of the modified filler in a mixer, stir and mix them, and then hot press at a temperature of 170°C and a pressure of 0.5MPa to obtain a film with a thickness of 50um, that is, the absorbing layer.
[0161] 3) Absorption / reflection layer preparation:
[0162] Gold nanowires (length: 10um; diameter: 200nm) were dispersed in methanol solvent at a concentration of 2...
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