CN110591164B - Solid nano dispersion wave-absorbing material - Google Patents
Solid nano dispersion wave-absorbing material Download PDFInfo
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- CN110591164B CN110591164B CN201910949343.5A CN201910949343A CN110591164B CN 110591164 B CN110591164 B CN 110591164B CN 201910949343 A CN201910949343 A CN 201910949343A CN 110591164 B CN110591164 B CN 110591164B
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- 239000011358 absorbing material Substances 0.000 title claims abstract description 73
- 239000006185 dispersion Substances 0.000 title claims abstract description 17
- 239000007787 solid Substances 0.000 title claims abstract description 17
- 238000001694 spray drying Methods 0.000 claims abstract description 25
- 239000003575 carbonaceous material Substances 0.000 claims abstract description 9
- 210000002244 magnetosome Anatomy 0.000 claims description 19
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 15
- 238000010008 shearing Methods 0.000 claims description 12
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 9
- 239000004917 carbon fiber Substances 0.000 claims description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 235000010489 acacia gum Nutrition 0.000 claims description 7
- 239000011230 binding agent Substances 0.000 claims description 7
- 239000002904 solvent Substances 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229920002125 Sokalan® Polymers 0.000 claims description 4
- 229910021389 graphene Inorganic materials 0.000 claims description 4
- 239000004584 polyacrylic acid Substances 0.000 claims description 4
- 239000004793 Polystyrene Substances 0.000 claims description 3
- 229920002223 polystyrene Polymers 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 229920002774 Maltodextrin Polymers 0.000 claims description 2
- 239000005913 Maltodextrin Substances 0.000 claims description 2
- 229940035034 maltodextrin Drugs 0.000 claims description 2
- 229920000767 polyaniline Polymers 0.000 claims description 2
- 239000001785 acacia senegal l. willd gum Substances 0.000 claims 1
- 238000011049 filling Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000002360 preparation method Methods 0.000 abstract description 4
- 238000000855 fermentation Methods 0.000 abstract description 3
- 230000002745 absorbent Effects 0.000 abstract description 2
- 239000002250 absorbent Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 238000009776 industrial production Methods 0.000 abstract description 2
- 230000005381 magnetic domain Effects 0.000 abstract description 2
- 230000000813 microbial effect Effects 0.000 abstract description 2
- 239000002245 particle Substances 0.000 abstract description 2
- 239000000843 powder Substances 0.000 abstract description 2
- 239000012188 paraffin wax Substances 0.000 description 18
- 239000000725 suspension Substances 0.000 description 11
- 238000012360 testing method Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 244000215068 Acacia senegal Species 0.000 description 6
- 229920000084 Gum arabic Polymers 0.000 description 6
- 239000000205 acacia gum Substances 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- UBEWDCMIDFGDOO-UHFFFAOYSA-N cobalt(II,III) oxide Inorganic materials [O-2].[O-2].[O-2].[O-2].[Co+2].[Co+3].[Co+3] UBEWDCMIDFGDOO-UHFFFAOYSA-N 0.000 description 3
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000002114 nanocomposite Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 240000007472 Leucaena leucocephala Species 0.000 description 1
- 235000010643 Leucaena leucocephala Nutrition 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007853 buffer solution Substances 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 238000012258 culturing Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000004151 fermentation Effects 0.000 description 1
- KTWOOEGAPBSYNW-UHFFFAOYSA-N ferrocene Chemical compound [Fe+2].C=1C=C[CH-]C=1.C=1C=C[CH-]C=1 KTWOOEGAPBSYNW-UHFFFAOYSA-N 0.000 description 1
- 238000004108 freeze drying Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000008204 material by function Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 210000001082 somatic cell Anatomy 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/06—Elements
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2265—Oxides; Hydroxides of metals of iron
- C08K2003/2275—Ferroso-ferric oxide (Fe3O4)
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/01—Magnetic additives
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
The invention discloses a solid nano-dispersion wave-absorbing material, which is single magnetic domain Fe obtained by microbial fermentation3O4The nano crystal-magnetosome is used as absorbent, and is compounded with carbon material, and then the biological nano wave-absorbing material is prepared by spray drying technology. The wave-absorbing material has the advantages of simple preparation method, small magnetic body filling amount, large powder production amount, lower production cost, easy large-scale industrial production, uniform and uniform particles of the obtained wave-absorbing material, strong stability, excellent wave-absorbing performance, wide wave-absorbing frequency, better effect compared with the current wave-absorbing material and high practical application value.
Description
Technical Field
The invention belongs to the technical field of wave-absorbing materials, and particularly relates to a solid nano-dispersion wave-absorbing material.
Background
With the development requirement of the electromagnetic stealth technology in the military field and the increasing severity of the problems of electromagnetic pollution and electromagnetic interference, the wave-absorbing material gradually becomes a research hotspot in the field of functional materials. A wave-absorbing material is a material that absorbs or substantially attenuates the energy of electromagnetic waves incident on its surface, thereby reducing the interference of electromagnetic waves and converting the electromagnetic energy into other forms of energy for consumption. In modern war, the demand for improving stealth performance and anti-electromagnetic interference capability of weapons is more and more strong in the face of radar detection technology of radar and strong electromagnetic interference technology of electronic warfare. The main approach for solving the problems is to design a material which can better absorb and shield electromagnetic waves, install the material on the surface of the weapon, and utilize a wave-absorbing material to absorb the electromagnetic waves or reduce the reflection of the electromagnetic waves, thereby realizing the invisible and anti-electromagnetic interference of the weapon. The traditional wave-absorbing materials, such as ferrite, metal micropowder, silicon carbide and the like, generally have the defects of narrow absorption band, high density, large filling ratio and the like, so that the application of the materials in practice is limited. The ideal wave-absorbing material generally needs to meet the requirements of thin thickness, light weight, wide absorption frequency, strong absorption performance (thin, light, wide and strong), and the like. Therefore, the development of the novel wave-absorbing material with novel structure and excellent comprehensive performance has important scientific value and application prospect.
Patent CN103347377A reports that RGO/Co is synthesized in two steps by a hydrothermal method3O4When the thickness of a sample is 3.3mm, the nano composite material has the best wave-absorbing performance at 13.8GHz, and the reflection loss reaches-43.7 dB. The method combines RGO and Co3O4Recombination to obtain RGO/Co3O4Nanocomposite, compared to single RGO and Co3O4The wave-absorbing performance is improved, but the method has complex raw material preparation process, so that the method is not suitable for large-scale production and limits practical application. According to "nanotechnology" 2015 (2): 46-50 reports that tubular Fe @ C composite materials with the outer diameter of 50-60 nm and the inner diameter of 30-40 nm are obtained by using ferrocene as a raw material through pyrolysis under the action of an external magnetic field by utilizing a Chemical Vapor Deposition (CVD) technology, and the maximum reflection loss is-18 dB when the thickness of the Fe @ C is 5mm and the frequency is 2.5 GHz. The Fe @ C complex prepared by the methodThe composite material has small size, good appearance and low preparation cost, but the wave-absorbing frequency band is narrow.
Disclosure of Invention
The invention aims to overcome the problems of narrow absorption band, high density, large filling ratio and the like of the existing wave-absorbing material, and provides a method for preparing a solid nano-dispersion wave-absorbing material which is prepared by a spray drying method and has the excellent characteristics of wide absorption band, low density, small filling ratio and the like.
Aiming at the purposes, the technical scheme adopted by the invention is as follows: the wave-absorbing material is prepared by uniformly mixing a magnetosome, a binder, a carbon material and a solvent according to the mass ratio of 1: 3-8: 0.5-3: 20-100, and then carrying out spray drying.
The carbon material is carbon fiber or graphene.
The binder is one or more of acacia, maltodextrin, polystyrene, polyurethane, polyaniline and polyacrylic acid.
The solvent is any one of water, acetone and ethyl acetate.
The mass ratio of the magnetosome to the binder, the carbon material and the solvent is preferably 1: 4-5: 1-2: 30-50.
The above-mentioned mode of uniformly mixing is firstly high-speed shearing, then high-pressure homogenizing.
The high-speed shearing power is 1000-1500W, and the pressure is 0.6-1.2 MPa.
The pressure for high-pressure homogenization is 500-1200 bar.
The air inlet temperature of the spray drying is 160-200 ℃, and the feeding rate is 50-200 kg/h.
The magnetosome is fermented and cultured according to the method disclosed in the publication No. CN101434921A entitled "a method for producing magnetosome by culturing magnetosome", fermentation liquor is centrifuged by a high-speed centrifuge, supernatant is removed, somatic cells are collected, water is added to reach a suspension state by a high-speed shearing machine, the obtained suspension is subjected to cell disruption by a high-pressure homogenizer, magnetosome is collected by a magnetic attraction method, impurities such as protein and the like are washed by PBS buffer solution, salt solution is removed by washing, and the magnetosome with high purity is obtained by freeze drying.
The invention has the following beneficial effects:
1. the invention utilizes single magnetic domain Fe obtained by microbial fermentation3O4The nano crystal-magnetosome is used as absorbent, and is compounded with carbon material, and then the biological nano wave-absorbing material is prepared by spray drying technology. The prepared wave-absorbing material has uniform and uniform particles, strong stability and high practical application value.
2. The wave-absorbing material has excellent wave-absorbing performance, wide wave-absorbing frequency, better effect than the current wave-absorbing material and wider application range.
3. The wave-absorbing material has the advantages of simple preparation method, small magnetic body filling amount, large powder generation amount, lower production cost and easy large-scale industrial production.
Drawings
Figure 1 is a reflection loss chart of the wave-absorbing material/paraffin wax prepared in example 1 at different thicknesses.
Detailed Description
The invention will be further described in detail with reference to the following figures and examples, but the scope of the invention is not limited to these examples.
Example 1
20g of gum arabic was added to 200g of water, and stirred to dissolve it, and then 5g of magnetosome and 5g of carbon fiber were added thereto, and suspended using a high-speed shearing machine at a power of 1200W and a pressure of 0.8 MPa. Homogenizing the obtained suspension by a high-pressure homogenizer under the pressure of 1000bar, and then spray-drying, wherein the air inlet temperature of the spray-drying is 180 ℃, and the feeding speed is 60kg/h, so as to obtain the solid nano-dispersion wave-absorbing material.
The wave-absorbing material is dispersed in paraffin, wherein the mass fraction of the wave-absorbing material is 30%, and the wave-absorbing material/paraffin mixture is pressed into a circular ring with the outer diameter of 7mm, the inner diameter of 3mm and the thickness of 3 mm. The lowest reflection loss value (RL) is obtained by testing the dielectric constant and the magnetic conductivity of the wave-absorbing material by using a vector network analyzermin) Is-55.2 dB at the thickness of 3mm, and is electromagnetic wave at 2-18 GHz at the thickness of 3mmThe bandwidth with reflection loss less than-10 dB in the band is 8.5GHz (see fig. 1).
Example 2
20g of gum arabic was added to 250g of water, and stirred to dissolve it, and then 4g of magnetosome and 4g of carbon fiber were added thereto, and suspended using a high-speed shearing machine at a power of 1200W and a pressure of 0.8 MPa. Homogenizing the obtained suspension by a high-pressure homogenizer under the pressure of 1000bar, and then spray-drying, wherein the air inlet temperature of the spray-drying is 180 ℃, and the feeding speed is 60kg/h, so as to obtain the solid nano-dispersion wave-absorbing material.
The wave-absorbing material is dispersed in paraffin, wherein the mass fraction of the wave-absorbing material is 30%, and the wave-absorbing material/paraffin mixture is pressed into a circular ring with the outer diameter of 7mm, the inner diameter of 3mm and the thickness of 3 mm. The lowest reflection loss value (RL) is obtained by testing the dielectric constant and the magnetic conductivity of the wave-absorbing material by using a vector network analyzermin) The bandwidth is 6.8GHz, the reflection loss of the bandwidth is less than-10 dB in the electromagnetic wave frequency band of 2-18 GHz when the bandwidth is 3mm and-35.2 dB when the thickness is 3 mm.
Example 3
20g of gum arabic was added to 200g of water, and stirred to dissolve it, and then 4g of magnetosome and 4g of carbon fiber were added thereto, and suspended using a high-speed shearing machine at a power of 1200W and a pressure of 0.8 MPa. Homogenizing the obtained suspension by a high-pressure homogenizer under the pressure of 1000bar, and then spray-drying, wherein the air inlet temperature of the spray-drying is 180 ℃, and the feeding speed is 60kg/h, so as to obtain the solid nano-dispersion wave-absorbing material.
The wave-absorbing material is dispersed in paraffin, wherein the mass fraction of the wave-absorbing material is 30%, and the wave-absorbing material/paraffin mixture is pressed into a circular ring with the outer diameter of 7mm, the inner diameter of 3mm and the thickness of 3 mm. The lowest reflection loss value (RL) is obtained by testing the dielectric constant and the magnetic conductivity of the wave-absorbing material by using a vector network analyzermin) The bandwidth is 7.8GHz, the reflection loss of the bandwidth is less than-10 dB in the electromagnetic wave frequency band of 2-18 GHz when the bandwidth is 3mm and-39.5 dB when the thickness is 3 mm.
Example 4
20g of gum arabic was added to 150g of water, and stirred to dissolve it, and then 4g of magnetosome and 4g of carbon fiber were added thereto, and suspended using a high-speed shearing machine at a power of 1200W and a pressure of 0.8 MPa. Homogenizing the obtained suspension by a high-pressure homogenizer under the pressure of 1000bar, and then spray-drying, wherein the air inlet temperature of the spray-drying is 180 ℃, and the feeding speed is 60kg/h, so as to obtain the solid nano-dispersion wave-absorbing material.
The wave-absorbing material is dispersed in paraffin, wherein the mass fraction of the wave-absorbing material is 30%, and the wave-absorbing material/paraffin mixture is pressed into a circular ring with the outer diameter of 7mm, the inner diameter of 3mm and the thickness of 3 mm. The lowest reflection loss value (RL) is obtained by testing the dielectric constant and the magnetic conductivity of the wave-absorbing material by using a vector network analyzermin) The bandwidth is 6.7GHz when the thickness is 3mm and the reflection loss is less than-10 dB in the electromagnetic wave frequency band of 2-18 GHz when the thickness is 3 mm.
Example 5
20g of gum arabic was added to 200g of water, and stirred to dissolve it, and then 5g of magnetosome and 4g of carbon fiber were added thereto, and suspended using a high-speed shearing machine at a power of 1200W and a pressure of 0.8 MPa. Homogenizing the obtained suspension by a high-pressure homogenizer under the pressure of 1000bar, and then spray-drying, wherein the air inlet temperature of the spray-drying is 180 ℃, and the feeding speed is 60kg/h, so as to obtain the solid nano-dispersion wave-absorbing material.
The wave-absorbing material is dispersed in paraffin, wherein the mass fraction of the wave-absorbing material is 30%, and the wave-absorbing material/paraffin mixture is pressed into a circular ring with the outer diameter of 7mm, the inner diameter of 3mm and the thickness of 3 mm. The lowest reflection loss value (RL) is obtained by testing the dielectric constant and the magnetic conductivity of the wave-absorbing material by using a vector network analyzermin) The bandwidth is 8.1GHz, the reflection loss of the bandwidth is less than-47.3 dB when the bandwidth is 3mm, and the reflection loss of the bandwidth is less than-10 dB when the bandwidth is 3 mm.
Example 6
20g of gum arabic was added to 200g of water, and stirred to dissolve it, and then 6g of magnetosome and 4g of carbon fiber were added thereto, and suspended using a high-speed shearing machine at a power of 1200W and a pressure of 0.8 MPa. Homogenizing the obtained suspension by a high-pressure homogenizer under the pressure of 1000bar, and then spray-drying, wherein the air inlet temperature of the spray-drying is 180 ℃, and the feeding speed is 60kg/h, so as to obtain the solid nano-dispersion wave-absorbing material.
The wave-absorbing material is dispersed in paraffin, wherein the mass fraction of the wave-absorbing material is 30%, and the wave-absorbing material/paraffin mixture is pressed into a circular ring with the outer diameter of 7mm, the inner diameter of 3mm and the thickness of 3 mm. The lowest reflection loss value (RL) is obtained by testing the dielectric constant and the magnetic conductivity of the wave-absorbing material by using a vector network analyzermin) The bandwidth is-44.8 dB when the thickness is 3mm, and the bandwidth is 7.8GHz when the reflection loss is less than-10 dB in an electromagnetic wave frequency band of 2-18 GHz when the thickness is 3 mm.
Example 7
20g of polyurethane was added to 200g of ethyl acetate, stirred to dissolve it, and then 5g of magnetosome and 5g of carbon fiber were added thereto, and they were brought into a suspended state using a high-speed shearer at a power of 1200W and a pressure of 0.8 MPa. Homogenizing the obtained suspension by a high-pressure homogenizer under the pressure of 1000bar, and then spray-drying, wherein the air inlet temperature of the spray-drying is 180 ℃, and the feeding speed is 60kg/h, so as to obtain the solid nano-dispersion wave-absorbing material.
The wave-absorbing material is dispersed in paraffin, wherein the mass fraction of the wave-absorbing material is 30%, and the wave-absorbing material/paraffin mixture is pressed into a circular ring with the outer diameter of 7mm, the inner diameter of 3mm and the thickness of 3 mm. The lowest reflection loss value (RL) is obtained by testing the dielectric constant and the magnetic conductivity of the wave-absorbing material by using a vector network analyzermin) The bandwidth is 6.5GHz when the thickness is 3mm and the reflection loss is less than-10 dB in the electromagnetic wave frequency band of 2-18 GHz when the thickness is 3mm, and-45.2 dB.
Example 8
20g of polystyrene was added to 200g of ethyl acetate, and stirred to be dissolved, then 5g of magnetosome and 5g of graphene were added thereto, and they were brought into a suspended state using a high-speed shearer at a power of 1000W and a pressure of 1.0 MPa. Homogenizing the obtained suspension by a high-pressure homogenizer under the pressure of 800bar, and then spray-drying, wherein the inlet air temperature of the spray-drying is 200 ℃, and the feeding rate is 100kg/h, so as to obtain the solid nano-dispersion wave-absorbing material.
Dispersing the wave-absorbing material in paraffin, wherein the mass fraction of the wave-absorbing material is 30%, and mixing the wave-absorbing material/paraffinPressing into a ring with the outer diameter of 7mm, the inner diameter of 3mm and the thickness of 3 mm. The lowest reflection loss value (RL) is obtained by testing the dielectric constant and the magnetic conductivity of the wave-absorbing material by using a vector network analyzermin) The bandwidth is 6.7GHz when the thickness is 3mm and the reflection loss is less than-10 dB in the electromagnetic wave frequency band of 2-18 GHz when the thickness is 3 mm.
Example 9
20g of polyacrylic acid was added to 200g of ethyl acetate, and stirred to dissolve the polyacrylic acid, and then 5g of magnetosome and 10g of graphene were added thereto, and suspended by using a high-speed shearing machine at a power of 1500W and a pressure of 0.6 MPa. Homogenizing the obtained suspension by a high-pressure homogenizer under the pressure of 1200bar, and then spray-drying, wherein the inlet air temperature of the spray-drying is 160 ℃, and the feeding rate is 80kg/h, so as to obtain the solid nano-dispersion wave-absorbing material.
The wave-absorbing material is dispersed in paraffin, wherein the mass fraction of the wave-absorbing material is 30%, and the wave-absorbing material/paraffin mixture is pressed into a circular ring with the outer diameter of 7mm, the inner diameter of 3mm and the thickness of 3 mm. The lowest reflection loss value (RL) is obtained by testing the dielectric constant and the magnetic conductivity of the wave-absorbing material by using a vector network analyzermin) The bandwidth is 7.6GHz, the reflection loss of the bandwidth is less than-38.1 dB at the thickness of 3mm in the electromagnetic wave frequency band of 2-18 GHz, and the bandwidth is 7.6 GHz.
Claims (3)
1. A solid nano dispersion wave-absorbing material is characterized in that: the wave-absorbing material is prepared by uniformly mixing a magnetosome, a binder, a carbon material and a solvent according to the mass ratio of 1: 3-8: 0.5-3: 20-100, and then carrying out spray drying; wherein, the binder is firstly added into the solvent, stirred and dissolved, and then added with the magnetosome and the carbon material; the uniform mixing mode comprises high-speed shearing and then high-pressure homogenizing, wherein the high-speed shearing power is 1000-1500W, the pressure is 0.6-1.2 MPa, and the high-pressure homogenizing pressure is 500-1200 bar;
the carbon material is carbon fiber or graphene;
the binder is any one or a mixture of more of Arabic gum, maltodextrin, polystyrene, polyurethane, polyaniline and polyacrylic acid;
the solvent is any one of water, ethyl acetate and acetone.
2. The solid nano-dispersion wave-absorbing material according to claim 1, wherein: the mass ratio of the magnetosome to the binder, the carbon material and the solvent is 1: 4-5: 1-2: 30-50.
3. The solid nano-dispersion wave-absorbing material according to claim 1, wherein: the air inlet temperature of the spray drying is 160-200 ℃, and the feeding rate is 50-200 kg/h.
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