CN102660221B - Graphite-doped poly-Schiff base/carbonyl iron powder composite stealth material - Google Patents
Graphite-doped poly-Schiff base/carbonyl iron powder composite stealth material Download PDFInfo
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- CN102660221B CN102660221B CN201210151456.9A CN201210151456A CN102660221B CN 102660221 B CN102660221 B CN 102660221B CN 201210151456 A CN201210151456 A CN 201210151456A CN 102660221 B CN102660221 B CN 102660221B
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- iron dust
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Abstract
The invention discloses a graphite-doped poly-Schiff base/carbonyl iron powder composite stealth material which is prepared by compounding graphite, poly-Schiff base and carbonyl iron powder. The graphite accounts for 12-19% of the whole composite material by mass, the poly-Schiff base accounts for 18-25% of the whole composite material by mass, and the balance is the carbonyl iron powder. The material has the advantages of excellent wave absorption performance, relatively wide absorption band, low cost and low density, is easy to prepare and has relatively high practical values when being used as an electromagnetic wave absorption material.
Description
Technical field
The present invention relates to a kind of electromagnetic wave absorbent material, particularly relate to a kind of graphite dopping polyShiff base/carbonyl iron dust composite stealthy material.
Background technology
Absorbing material refers to and can absorb the electromagnetic wave energy that projects its surface, and make electromagnetic wave energy be converted into a class material of the energy of heat energy or other form by the dielectric loss of material, absorbing material general requirement is high to be absorbed, bandwidth, the features such as quality is light and structure properties is stable under used environment, conventional absorbing material mainly contains: carbonyl iron dust, metal fine powder, semiconductor material, conduction high polymer, carbon black, polycrystalline iron fiber etc., at present, traditional invisible coating is still to be absorbed as by force major objective both at home and abroad, exist a large amount of outstanding problems to have to be solved, narrower absorption frequency range cannot resist the comprehensive scouting of wide-band radar wave, wave absorbing efficiency is low, shallow layer does not reach inhales ripple requirement, thick coating significantly increases system weight, affect the maneuvering ability of system, and the bonding strength of coating and matrix is not enough, easily come off.Publication number is CN1206204A, the Chinese patent document of a kind of new electromagnetic wave absorbing material by name and manufacture method thereof, the electromagnetic wave absorbent material of making through respective handling with ferrite magnetic material and zinc, cobalt, copper etc. is disclosed, this material has stronger microwave absorbing property at 600 megahertzes to 5000 megahertzes, said as this document, this material is only better at low-frequency range absorbing property; Publication number is CN101853727A, the Chinese patent document of a kind of iron-graphite composite electromagnetic absorption material by name and preparation method thereof, a kind of iron-graphite composite electromagnetic absorption material is disclosed, its feature is that the outside that is wrapped in iron nano-particle with nano level C forms C film, this material has stronger absorption of electromagnetic wave in low-frequency range, but its deficiency is also more obvious, be mainly that thickness is larger, frequency range is compared with narrow and density is large.Pertinent literature is not reported about the research of polyShiff base class composite wave-suction material.
Summary of the invention
The present invention is directed to the deficiency that existing electromagnetic wave absorbent material exists, a kind of graphite dopping polyShiff base/carbonyl iron dust composite stealthy material and its preparation method are provided, of the present inventionly prepare product graphite dopping polyShiff base/carbonyl iron dust composite stealthy material to have absorbing property strong, absorption band is wide, and light weight layer is thin, stable performance, corrosion-resistant and high-temperature resistant, with low cost, prepare simple advantage, wherein inhaling ripple bandwidth is its maximum advantage.
Technical solution of the present invention:
1, a kind of graphite dopping polyShiff base/carbonyl iron dust composite stealthy material is to be mixed and obtain with carbonyl iron dust by graphite dopping polyShiff base, and quality ratio of components is: graphite 12%-19%, and polyShiff base 18%-25%, surplus is carbonyl iron dust.
2, the preparation of graphite dopping polyShiff base be by graphite add Ursol D and oxalic dialdehyde in ethanolic soln, phenylenediamine and oxalic dialdehyde mol ratio be 1:1.Induction stirring reaction 8-10h at 25 ℃～50 ℃.Products therefrom after filtration, after washing with alcohol, drying treatment, at 300 ℃, sintering is 2～3 hours, obtains graphite dopping polyShiff base.
3, the graphite granule granularity 1-3 μ m that adulterates used, purity is greater than 98.5%.
4, the required carbonyl iron dust of graphite dopping polyShiff base/carbonyl iron dust composite stealthy material, its median size is less than 3.5 μ m, the carbonyl iron dust that Fe content is greater than 97%.
Graphite dopping polyShiff base/carbonyl iron dust composite stealthy material wave-absorbing effect prepared by the present invention is better, has-more than 8dB reflectivity by adjusting the ratio of each component in material, can realizing in the scope of 8-12GHz, and absorption band is wider; And coat-thickness is at 2-3mm, thinner; Composition over 1/3 in material is polyShiff base and graphite, so whole density of material is little, quality is light; The preparation cost of this material is cheap simultaneously, and preparation process is simple.This composite stealthy material has important practical value as can be seen here.
Accompanying drawing explanation
Fig. 1: process flow sheet of the present invention;
Fig. 2: embodiment 1 reflectance test result figure;
Fig. 3: embodiment 2 reflectance test result figure;
Fig. 4: embodiment 3 reflectance test result figure.
Embodiment
In conjunction with content of the present invention, provide following three embodiment:
Embodiment mono-:
Get 0.2mol Ursol D and 0.2mol oxalic dialdehyde is dissolved in 300ml ethanolic soln, then add 29.6g graphite, induction stirring reaction 8h at 50 ℃.Products therefrom filtration under diminished pressure, with alcohol flushing 2～3 times, above-mentioned product is dry after at 300 ℃ sintering 2～3 hours, obtain graphite dopping polyShiff base; Get above-mentioned 24g graphite dopping polyShiff base and mix with 42.7g carbonyl iron dust and obtain graphite dopping polyShiff base/carbonyl iron dust composite stealthy material, wherein the median size of carbonyl iron dust is less than 3.5 μ m.Matrix material component is graphite: 18%, and polyShiff base: 18%, all the other are carbonyl iron dust.This absorbing material powder and paraffin blend are prepared to mixture, and it is 50% that powder particle accounts for whole mixture weight percent, and all the other are paraffin.This mixture is coated on the standard aluminium sheet of 18cm*18cm*2mm, thickness is 2mm, according to national military standard GJB2038-94 " radar absorbing reflectance test method ", its reflectivity is tested, this material has within the scope of 8.6-12.2GHz-more than 8dB reflectivity, maximum absorption is-16.7dB that the reflectance test result of this material is illustrated in fig. 2 shown below.
Embodiment bis-:
Get 0.2mol Ursol D and 0.2mol oxalic dialdehyde is dissolved in 300ml ethanolic soln, then add 19.7g graphite, under induction stirring, react 8h-10h, induction stirring reaction 9h at 50 ℃.Products therefrom filtration under diminished pressure, with alcohol flushing 2～3 times, above-mentioned product is dry after at 300 ℃ sintering 2～3 hours, obtain graphite dopping polyShiff base; Get above-mentioned 24g graphite dopping polyShiff base and mix with 56g carbonyl iron dust and obtain graphite dopping polyShiff base/carbonyl iron dust composite stealthy material, wherein the median size of carbonyl iron dust is less than 3.5 μ m.Matrix material component is graphite: 12%, and polyShiff base: 18%, all the other are carbonyl iron dust.This absorbing material powder and paraffin blend are prepared to mixture, and it is 50% that powder particle accounts for whole mixture weight percent, and all the other are paraffin.This mixture is coated on the standard aluminium sheet of 18cm*18cm*2mm, thickness is 2mm, according to national military standard GJB2038-94 " radar absorbing reflectance test method ", its reflectivity is tested, this material has within the scope of 8.5-11.7GHz-more than 8dB reflectivity, maximum absorption is-11.7dB that the reflectance test result of this material is illustrated in fig. 4 shown below.
Embodiment tri-:
Get 0.2mol Ursol D and 0.2mol oxalic dialdehyde is dissolved in 300ml ethanolic soln, then add 14.2g graphite, induction stirring reaction 10h at 50 ℃.Products therefrom filtration under diminished pressure, with alcohol flushing 2～3 times, above-mentioned product is dry after at 300 ℃ sintering 2～3 hours, obtain graphite dopping polyShiff base; Get above-mentioned 10g graphite dopping polyShiff base and mix with 40.9g carbonyl iron dust and obtain graphite dopping polyShiff base/carbonyl iron dust composite stealthy material, wherein the median size of carbonyl iron dust is less than 3.5 μ m.Matrix material component is graphite: 12%, and polyShiff base: 25%, all the other are carbonyl iron dust.This absorbing material powder and paraffin blend are prepared to mixture, and it is 50% that powder particle accounts for whole mixture weight percent, and all the other are paraffin.This mixture is coated on the standard aluminium sheet of 18cm*18cm*2mm, thickness is 2mm, according to national military standard GJB2038-94 " radar absorbing reflectance test method ", its reflectivity is tested, this material has within the scope of 10-12.2GHz-more than 8dB reflectivity, maximum absorption is-10.8dB that the reflectance test result of this material is illustrated in fig. 3 shown below.
Claims (3)
1. graphite dopping polyShiff base/carbonyl iron dust composite stealthy material, it is characterized in that: graphite dopping polyShiff base/carbonyl iron dust composite stealthy material is to be mixed and obtain with carbonyl iron dust by graphite dopping polyShiff base, quality ratio of components is: graphite 12%-19%, polyShiff base 18%-25%, surplus is carbonyl iron dust;
The preparation method of described graphite dopping polyShiff base: by graphite add Ursol D and oxalic dialdehyde in ethanolic soln, Ursol D and oxalic dialdehyde mol ratio be 1:1; Induction stirring reaction 8-10h at 25 ℃～50 ℃; Products therefrom after filtration, after washing with alcohol, drying treatment, at 300 ℃, sintering is 2～3 hours, obtains graphite dopping polyShiff base.
2. a kind of graphite dopping polyShiff base/carbonyl iron dust composite stealthy material according to claim 1, is characterized in that: described graphite granule granularity 1-3 μ m, purity is greater than 98.5%.
3. a kind of graphite dopping polyShiff base/carbonyl iron dust composite stealthy material according to claim 1, is characterized in that: the median size of described carbonyl iron dust is less than 3.5 μ m, the carbonyl iron dust that Fe content is greater than 97%.
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| CN201210151456.9A CN102660221B (en) | 2012-05-16 | 2012-05-16 | Graphite-doped poly-Schiff base/carbonyl iron powder composite stealth material |
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| CN103555270B (en) * | 2013-11-07 | 2015-04-15 | 南昌航空大学 | Chiral poly-schiff alkali salt/ferrite wave-adsorbing material and preparation method thereof |
| CN105062091B (en) * | 2015-08-03 | 2017-03-15 | 南昌航空大学 | A kind of ferrocenyl chirality polyShiff base salt/Graphene composite wave-suction material |
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| CN1320602A (en) * | 2001-01-16 | 2001-11-07 | 天津大学 | Retinyl Schiff's base-iron complex as microwave absorbent and its preparing process |
| JP2002241679A (en) * | 2001-02-20 | 2002-08-28 | Hitachi Metals Ltd | Electromagnetic wave absorbing coating material, electromagnetic wave absorbing material and method for applying the same |
| KR100549992B1 (en) * | 2003-09-01 | 2006-02-08 | 학교법인 포항공과대학교 | Thiophen monomer, method for preparing the same, polythiophen derivative and copolymer using the thiophen monomer |
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