Green industrial preparation method of ferroferric oxide/reduced graphene oxide and wave-absorbing resin composite material prepared from ferroferric oxide/reduced graphene oxide
A technology of ferroferric oxide and composite materials, which is applied in the field of nano-electromagnetic functional materials, can solve the problems that the wave-absorbing particles cannot be environmentally friendly and the electromagnetic parameters in the thickness direction are not uniform, and achieve excellent impedance matching performance, safe production process, The effect of guaranteeing uniformity
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Embodiment 1
[0044]A green industrial preparation method of Fe3O4 / reduced graphene oxide nano-wave absorbing particles: adding distilled water, and preparing 1400g of industrial graphene oxide slurry with a concentration of 1.0wt% into 21L of graphene oxide with a concentration of 0.67mg / mL Dispersion (mass of graphene oxide is 14 g). 326.48g FeCl 3 ·6H 2 O and 240.16g FeCl 2 ·4H 2 O was dissolved in water to prepare 7L of iron salt mixed solution with a concentration of 0.08g / L. The prepared iron salt mixed solution and graphene oxide dispersion were poured into the reactor, and nitrogen protection was introduced. Under the mechanical stirring of 200r / min, the NaOH aqueous solution of 0.2g / mL was added dropwise after being heated to 90°C, until The pH of the solution reached 10-11, and then the reaction was carried out at 90 °C for 2 h under the mechanical stirring of 200 r / min. After the first-stage reaction was completed, 21 g of ascorbic acid was added to the reaction kettle, kept...
Embodiment 2
[0046] A green industrial preparation method of ferric oxide / reduced graphene oxide nano-absorbing particles: adding distilled water, and preparing 1000 g of industrial graphene oxide slurry with a concentration of 1.0 wt % into 15 L of graphene oxide with a concentration of 0.67 mg / mL Dispersion (mass of graphene oxide is 10 g). 233g FeCl 3 ·6H 2 O and 172g FeCl 2 ·4H 2 O was dissolved in water to prepare 5L of iron salt mixed solution with a concentration of 0.08g / L. The prepared iron salt mixed solution and graphene oxide dispersion were poured into the reaction kettle, and nitrogen protection was introduced. Under the mechanical stirring of 200r / min, the ammonia water of mass fraction 25wt% was added dropwise after being heated to 90°C until the solution was The pH was 10-11, and then the reaction was carried out at 90 °C for 3 h under the mechanical stirring of 200 r / min. After the first-stage reaction was completed, 15 g of ascorbic acid was added to the reaction ke...
Embodiment 3
[0048] A specific preparation method of ferric oxide / reduced graphene oxide / epoxy resin wave-absorbing composite material: weigh 129.72g of bisphenol A epoxy resin E-51, add 103.26g of curing agent hexahydrophthalic anhydride (HHPA) , at 35 ° C, according to the particle filling amount of 30%, add the weighed ferric oxide / reduced graphene oxide nano-absorbing particles prepared in Example 1, after uniform dispersion, add 1.16g accelerator 2,4, 6-Tris(dimethylaminomethyl)phenol, after uniform dispersion, a blending system of particles and epoxy resin is obtained, which is divided into three equal parts.
[0049] Apply mold release agent to the mold with the inner size of 250×250×20mm, and put it in the oven to preheat. In the process of layered pouring, the first blend of nano-wave absorbing particles and epoxy resin was poured into the mold and leveled, heated at 100 °C for 1 hour to reach a gel state, and then the second The blend of nano-absorbing particles and epoxy resin ...
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