A flower-shaped carbonyl iron particle and its preparation method
A technology of carbonyl iron and carbonyl iron powder, which is applied in the field of preparation of flower-shaped carbonyl iron particles, can solve the problems of reduced absorption efficiency and eddy current loss, and achieve the effects of long service life, high mechanical strength and good weather resistance
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Embodiment 1
[0032] The preparation method of flower-shaped carbonyl iron particles provided in this example, the flower-shaped carbonyl iron particles are prepared by reaction of spherical carbonyl iron particles, reducing agent, iron salt, stabilizer, complexing agent, surface treatment agent, and pH regulator into; the spherical carbonyl iron powder is micron-sized iron particles.
[0033] The reducing agent is at least one of sodium borohydride, formaldehyde, potassium sodium tartrate, hydrazine sulfate, glyoxal, dimethylaminoborane, and metol.
[0034] The iron salt is at least one of ferrous sulfate heptahydrate, ferric chloride, ferric sulfate, ferrous chloride and ferric nitrate.
[0035] The stabilizer is at least one of gelatin, diiodotyrosine, laurylacetine, cystine, cysteine, and dimethyldithiocarbamate.
[0036] Described complexing agent is polyvinylpyrrolidone (PVP), sodium nitrilotriacetate (NTA), ethylenediaminetetraacetate (EDTA disodium or tetrasodium), diethylenetriami...
Embodiment 2
[0065] For the flower-shaped carbonyl iron particles of the present embodiment, the reactant comprises the following components by concentration: carbonyl iron particles 0.6mol / L, reducing agent (sodium borohydride) 1.2mol / L, iron salt (ferrous sulfate heptahydrate) 0.05mol / L, stabilizer (gelatin) 0.02mol / L, complexing agent (polyvinylpyrrolidone (PVP)) 0.0015mol / L, pH regulator (sodium hydroxide) 0.06mol / L.
[0066] The specific operation is as follows:
[0067] a. Dissolving the reducing agent and the pH regulator in deionized water and forming a reducing agent mixed solution under the action of magnetic stirring;
[0068] b Take an appropriate amount of carbonyl iron particles, and remove impurities on the surface of the carbonyl iron particles with a surface treatment agent solution in a concentration;
[0069] c. adding the carbonyl iron particles, iron salt, stabilizer and complexing agent after removing impurities into deionized water and stirring to form a mixed solu...
Embodiment 3
[0078] The electromagnetic wave-absorbing layer of the present embodiment, preparation raw material comprises following component by weight percentage: polyol (castor oil) 22.4%, flower shape carbonyl iron powder) 60%, diisocyanate (diphenylmethane diisocyanate) 2%, Reinforcing agent (mica) 15%, organometallic catalyst (stannous octoate) 0.2%, accelerator (stearyl alcohol) 0.3%, stabilizer (zinc oxide) 0.1%;
[0079] The specific operation is as follows:
[0080] a. Dry the polyol to remove the moisture: weigh the corresponding weight of the polyol according to the set weight percentage and put it into a wide-mouth beaker, then place the wide-mouth beaker in a vacuum drying oven at a temperature of 100 °C, Dry for 45 minutes at a vacuum of -0.1 MPa to obtain a moisture-free polyol.
[0081] b. Add flower-shaped carbonyl iron powder and reinforcing agent to step a according to the set weight percentage and stir evenly, then add diisocyanate and organometallic catalyst accordin...
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