A kind of fly ash-based core-shell structure lightweight wave-absorbing composite material and its preparation method
A technology of composite materials and fly ash, which is applied in the field of fly ash-based core-shell structure lightweight microwave-absorbing composite materials and its preparation, can solve the problems of limited comprehensive performance improvement, and achieve high compressive strength, high absorption strength, low cost effect
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[0038] A method for preparing a fly ash-based core-shell structure lightweight wave-absorbing composite material, comprising the following steps:
[0039] (1) Place fly ash hollow microspheres in a container of electroless cobalt-nickel plating solution, heat to 80°C, add reducing agent solution dropwise, react for 20-50 minutes, then wash with distilled water and ethanol in sequence, and dry to obtain Brown powder, spare;
[0040] (2) Add polymerization monomer, initiator and the brown powder prepared in step (1) to the reactor, mix in an ice bath for 30 min in a neutral pH environment, keep the temperature at 0-5°C, and react for 6 h , washed, and dried to obtain a black powder, which is a lightweight wave-absorbing composite material with a fly ash-based core-shell structure.
[0041] Preferably, calculated in g / mL, 0.2-1.5 mL of polymerization monomer needs to be added to 1-5 g of the brown powder prepared in step (1).
[0042] Further, the composition of the electroless...
Embodiment 1
[0051] A method for preparing a fly ash-based core-shell structure lightweight wave-absorbing composite material, comprising the following steps:
[0052] (1) Place fly ash hollow microspheres in a container of electroless cobalt-nickel plating solution, add reducing agent solution dropwise when heated to 80°C, react for 50 minutes, wash with water and ethanol, and dry to obtain a brown powder. spare;
[0053] The composition of the electroless cobalt-nickel solution is: 0.020 g / mL NiCl 2 ·6H 2 O, 0.06 g / mL of CoCl 2 ·6H 2 O, 0.035 g / mL of Na 3 C 6 h 5 o 7 2H 2 O with 25 wt.% NH 3 ·H 2 O solution adjusts the system pH=8;
[0054] The composition of the reducing agent solution is: 0.040 g / mL of NaH 2 PO 2 ·H 2 O.
[0055] (2) Add 0.800 mL of polymerization monomer pyrrole py, 2.630 g of initiator ammonium persulfate and 2 g of the brown powder prepared in (1) to the second reactor, mix in an ice bath in a neutral pH environment After 30 minutes, keep the tempera...
Embodiment 2
[0058] A method for preparing a fly ash-based core-shell structure lightweight wave-absorbing composite material, comprising the following steps:
[0059] (1) Place fly ash hollow microspheres in a container of electroless cobalt-nickel plating solution, add reducing agent solution dropwise when heated to 80°C, react for 30 minutes, wash with water and ethanol, and dry to obtain a brown powder. spare;
[0060] The composition of the electroless cobalt-nickel solution is: 0.020 g / mL NiCl 2 ·6H 2 O, 0.06 g / mL of CoCl 2 ·6H 2 O, 0.035 g / mL of Na 3 C 6 h 5 o 7 2H 2 O with 25 wt.% NH 3 ·H 2 The O solution adjusts the pH of the system to 10;
[0061] The composition of the reducing agent solution is: 0.040 g / mL of NaH 2 PO 2 ·H 2 O.
[0062](2) Add 0.800 mL of polymerization monomer pyrrole py, 2.630 g of initiator ammonium persulfate and 2 g of the brown powder prepared in (1) to the second reactor, mix in an ice bath in a neutral pH environment After 30 minutes, ke...
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