Carbon nano-tube base composite filler, method for preparing same and epoxy resin base electromagnetic shielding nano-composite material
A carbon nanotube and composite filler technology, which is applied in the fields of magnetic field/electric field shielding, electrical components, etc., can solve the problems of reducing the electrical conductivity and the difficulty of carbon nanotubes to meet the electromagnetic shielding requirements of new aerospace weapons and equipment.
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[0029] The invention provides a method for preparing a carbon nanotube-based composite filler, comprising the following steps:
[0030] (1) AgNO 3 , sodium citrate and water are mixed, and NaBH is added to the resulting mixed solution 4 Solution, carry out the first reduction reaction, obtain Ag-citric acid nano particle dispersion liquid;
[0031] The Ag-citric acid nanoparticle dispersion, Fe 3 o 4 Nanoparticles and water were mixed, and hydroxylammonium hydrochloride solution and AgNO were added to the resulting mixed dispersion 3 Solution, carry out the second reduction reaction, obtain Fe 3 o 4 @Ag-citric acid nanoparticle dispersion;
[0032] the Fe 3 o 4 @Ag-citric acid nanoparticle dispersion, 11-mercaptoundecanoic acid and ethanol were mixed for ligand replacement reaction to obtain Fe 3 o 4 @Ag-COOH nanoparticles;
[0033] (2) mixing carbon nanotubes, sulfuric acid and nitric acid, and carrying out carboxylation treatment to obtain carboxylated carbon nano...
Embodiment 1
[0081] (1) Add 1 mL of AgNO with a mass concentration of 1% in 90 mL of deionized water 3 solution, after stirring for 2 minutes, add 2 mL of sodium citrate solution with a concentration of 38.8 mmol / L, stir for 3 minutes, then add 1 mL of sodium borohydride solution with a mass concentration of 0.075%, and carry out a reduction reaction at room temperature for 5 minutes to obtain Ag-lemon Acid nanoparticle dispersion;
[0082] The Ag-citric acid nanoparticle dispersion liquid and 0.5mL concentration are the Fe of 0.2mol / L 3 o 4 Mix the aqueous dispersion of nanoparticles, ultrasonicate for 30min, then add 0.2mL of hydroxylammonium hydrochloride solution with a concentration of 0.2mol / L and 0.5mL of silver nitrate solution with a mass concentration of 1%, carry out the reduction reaction under stirring for 10min at room temperature, repeat Add hydroxylammonium hydrochloride solution, silver nitrate solution and stir twice to obtain Fe 3 o 4 @Ag-citric acid nanoparticle dis...
Embodiment 2
[0092] Prepare epoxy resin-based electromagnetic shielding nanocomposites according to the method of Example 1, the difference is that Fe 3 o 4 The volume of nanoparticle solution is 1mL; the volume of N-methylpyrrolidone solution of aminated carbon nanotubes is 17mL, and the amidation reaction time is 6h; adding curing agent 2,4,6-trimethyl-1,3- The temperature of phenylenediamine is 80°C, and the curing time is 6h.
[0093] According to the method of Example 1, the obtained epoxy resin-based electromagnetic shielding nanocomposite material was tested for performance, and the results showed that the shielding efficiency of the epoxy resin based electromagnetic shielding nanocomposite material was 33.1 dB.
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