A kind of aramid fiber electromagnetic shielding paper and preparation method thereof
A technology of aramid fiber and electromagnetic shielding, applied in powder coatings, polyamide coatings, coatings, etc., can solve the problems of limited portability of electromagnetic shielding materials and restrictions on aerospace applications, and achieve scale production and simple operation Effect
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[0022] The invention provides a kind of preparation method of aramid fiber electromagnetic shielding paper, comprising the following steps:
[0023] (1) drying the ethanol-water dispersion of carbon nanotubes to obtain carbon nanotube powders;
[0024] (2) After mixing the aqueous dispersion of para-aramid chopped fibers, the aqueous dispersion of para-aramid pulp fibers and the debonding agent, carry out dissolving treatment and shearing treatment successively, and dry the obtained aramid fiber slurry , to obtain aramid fiber powder;
[0025] (3) Coating the obtained material after mixing the carbon nanotube powder in the step (1) and the aramid fiber powder in the step (2) on the surface of the matrix film, and forming by hot pressing to obtain the aramid fiber electromagnetic shielding paper;
[0026] The steps (1) and (2) are not limited in time order.
[0027] In the invention, the ethanol-water dispersion of carbon nanotubes is dried to obtain carbon nanotube powders. ...
Embodiment 1
[0042] Mix 2 g of whisker-shaped multi-walled carbon nanotubes (2-5 μm in length and 30-150 nm in diameter) with 10 mL of ethanol and perform a wetting treatment for 10 min. Mix the ethanol dispersion of the obtained carbon nanotubes with 200 mL of water and place Under the condition of 40KHz frequency, ultrasonic treatment was carried out for 30min, and then shearing treatment was carried out for 30min under the condition of 3000r / min rotating speed, so as to obtain the ethanol-water dispersion of carbon nanotubes; For drying, when the outlet air temperature of the spray dryer reaches 85°C and the temperature remains stable, turn on the atomizer for 30s, then turn on the peristaltic pump, adjust the speed to 12Krpm for spray drying, and obtain carbon nanotube powder;
[0043] Mix 1g of para-aramid chopped fibers (3-5mm in length) with 100mL of water, and disperse them mechanically for 10 minutes. Mix the obtained material with 100mL of water, and continue to disperse them mech...
Embodiment 2
[0049] Mix 3 g of whisker-like multi-walled carbon nanotubes (2-5 μm in length and 30-150 nm in diameter) with 10 mL of ethanol and perform a wetting treatment for 20 min. Mix the resulting ethanol dispersion of carbon nanotubes with 200 mL of water in Under the condition of 40KHz frequency, ultrasonic treatment was carried out for 40min, and then the shear treatment was carried out for 40min under the condition of 3000r / min rotating speed to obtain the ethanol-water dispersion of carbon nanotubes; For drying, when the outlet air temperature of the spray dryer reaches 80°C and the temperature remains stable, turn on the atomizer for 30s, then turn on the peristaltic pump, adjust the speed to 18Krpm for spray drying, and obtain carbon nanotube powder;
[0050] Mix 3g of para-aramid chopped fibers (3-5mm in length) with 300mL of water, and disperse them mechanically for 15 minutes. Mix the obtained material with 300mL of water, and continue to disperse them mechanically for 5 min...
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