CN113136726A - Microwave absorbent based on cooperative coupling protection and preparation method thereof - Google Patents
Microwave absorbent based on cooperative coupling protection and preparation method thereof Download PDFInfo
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- 239000002250 absorbent Substances 0.000 title claims abstract description 35
- 230000002745 absorbent Effects 0.000 title claims abstract description 35
- 230000008878 coupling Effects 0.000 title claims abstract description 20
- 238000010168 coupling process Methods 0.000 title claims abstract description 20
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000000835 fiber Substances 0.000 claims abstract description 46
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 45
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229910002113 barium titanate Inorganic materials 0.000 claims abstract description 25
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000002131 composite material Substances 0.000 claims abstract description 20
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims abstract description 13
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims abstract description 13
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims abstract description 13
- 239000002657 fibrous material Substances 0.000 claims abstract description 12
- 238000001523 electrospinning Methods 0.000 claims abstract description 10
- YHWCPXVTRSHPNY-UHFFFAOYSA-N butan-1-olate;titanium(4+) Chemical compound [Ti+4].CCCC[O-].CCCC[O-].CCCC[O-].CCCC[O-] YHWCPXVTRSHPNY-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000002105 nanoparticle Substances 0.000 claims abstract description 7
- 239000004094 surface-active agent Substances 0.000 claims abstract description 6
- 159000000009 barium salts Chemical class 0.000 claims abstract description 5
- 239000002184 metal Substances 0.000 claims abstract description 5
- 229910052751 metal Inorganic materials 0.000 claims abstract description 5
- 150000003839 salts Chemical class 0.000 claims abstract description 3
- 239000000243 solution Substances 0.000 claims description 48
- 238000000034 method Methods 0.000 claims description 18
- 238000003756 stirring Methods 0.000 claims description 18
- 238000009987 spinning Methods 0.000 claims description 16
- IWOUKMZUPDVPGQ-UHFFFAOYSA-N barium nitrate Chemical compound [Ba+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O IWOUKMZUPDVPGQ-UHFFFAOYSA-N 0.000 claims description 12
- 239000002243 precursor Substances 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 238000001354 calcination Methods 0.000 claims description 6
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 239000002904 solvent Substances 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 229910017052 cobalt Inorganic materials 0.000 claims description 5
- 239000010941 cobalt Substances 0.000 claims description 5
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 4
- 239000002202 Polyethylene glycol Substances 0.000 claims description 4
- 229920001223 polyethylene glycol Polymers 0.000 claims description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 2
- ITHZDDVSAWDQPZ-UHFFFAOYSA-L barium acetate Chemical compound [Ba+2].CC([O-])=O.CC([O-])=O ITHZDDVSAWDQPZ-UHFFFAOYSA-L 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 238000011068 loading method Methods 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 2
- 239000012266 salt solution Substances 0.000 claims description 2
- 229910052725 zinc Inorganic materials 0.000 claims description 2
- 239000011701 zinc Substances 0.000 claims description 2
- 150000001242 acetic acid derivatives Chemical class 0.000 claims 1
- 150000002823 nitrates Chemical class 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 5
- 239000002994 raw material Substances 0.000 abstract description 2
- 239000000969 carrier Substances 0.000 abstract 1
- 238000003837 high-temperature calcination Methods 0.000 abstract 1
- 238000009776 industrial production Methods 0.000 abstract 1
- 239000003960 organic solvent Substances 0.000 abstract 1
- 238000004729 solvothermal method Methods 0.000 abstract 1
- 238000010521 absorption reaction Methods 0.000 description 12
- 238000005303 weighing Methods 0.000 description 8
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(3+);trinitrate Chemical compound [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 description 6
- 230000007547 defect Effects 0.000 description 4
- 238000002310 reflectometry Methods 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 239000011358 absorbing material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- UFMZWBIQTDUYBN-UHFFFAOYSA-N cobalt dinitrate Chemical compound [Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O UFMZWBIQTDUYBN-UHFFFAOYSA-N 0.000 description 2
- 229910001981 cobalt nitrate Inorganic materials 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- KBJMLQFLOWQJNF-UHFFFAOYSA-N nickel(ii) nitrate Chemical compound [Ni+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O KBJMLQFLOWQJNF-UHFFFAOYSA-N 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- PVFSDGKDKFSOTB-UHFFFAOYSA-K iron(3+);triacetate Chemical compound [Fe+3].CC([O-])=O.CC([O-])=O.CC([O-])=O PVFSDGKDKFSOTB-UHFFFAOYSA-K 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
- D06M11/32—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond
- D06M11/36—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond with oxides, hydroxides or mixed oxides; with salts derived from anions with an amphoteric element-oxygen bond
- D06M11/46—Oxides or hydroxides of elements of Groups 4 or 14 of the Periodic Table; Titanates; Zirconates; Stannates; Plumbates
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F9/00—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments
- D01F9/08—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments of inorganic material
- D01F9/10—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments of inorganic material by decomposition of organic substances
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Fibers (AREA)
- Multicomponent Fibers (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention relates to a microwave absorbent based on cooperative coupling protection and a preparation method thereof, wherein ferrite fibers are used as carriers to load barium titanate nanoparticles, and the preparation method comprises the following specific steps: dissolving metal salt and polyvinylpyrrolidone in an ethanol solution, and preparing ferrite fibers by adopting a sol-gel electro-spinning high-temperature calcination technology; adding soluble barium salt and tetrabutyl titanate into an organic solvent, adding a surfactant, and carrying out a solvothermal reaction at 150-180 ℃ to obtain the ferrite-barium titanate composite fiber material. The invention has the characteristics of wide raw material source, low cost and excellent performance, and the preparation technology is simple, easy to control and easy to realize industrial production.
Description
Technical Field
The invention relates to the field of preparation of inorganic nano materials, in particular to a microwave absorbent based on cooperative coupling protection and a preparation method thereof.
Background
The rapid development of wireless communication and electronic technologies has prompted the widespread use of electronic devices in military and civilian applications, and the hazards of electromagnetic radiation and electromagnetic interference have received increasing social attention. In order to solve this problem, the realization of attenuation and absorption of electromagnetic waves by microwave absorbing materials is the most ideal method and has received much attention. Microwave absorption is the absorption and attenuation of incident energy by energy conversion and multiple scattering. In order to improve the electromagnetic wave absorption performance of the absorbent, two key factors must be considered. One is the damping performance and the other is the impedance matching of the absorbing material to air. Traditional absorbents such as ferrite and the like have the advantages of wide absorption frequency band and strong absorption and are widely applied to wave-absorbing materials, but the defects of poor matching property with air and large specific gravity limit the application range of the traditional absorbents. In recent years, composite materials consisting of magnetic and dielectric absorbers have proven to be an effective strategy to achieve good impedance matching and electromagnetic losses by means of a synergistic coupling effect between the electrical losses of the dielectric material and the magnetic losses of the magnetic material. However, the composite materials studied at present mainly comprise powder composite, and still have the defect of large specific gravity.
Disclosure of Invention
Aiming at the defects and technical defects of the existing product, the invention aims to provide a microwave absorbent based on cooperative coupling protection and a preparation method thereof. The product has the advantages of light weight, wide frequency band, strong absorption and the like, the preparation method is simple, the cost is low, and the microwave absorption performance of the composite fiber material is effectively improved.
The technical scheme of the invention is as follows: the microwave absorbent takes ferrite fibers as a carrier and loads barium titanate nanoparticles to prepare ferrite and barium titanate composite fibers.
A preparation method of a microwave absorbent based on cooperative coupling protection comprises the following steps:
s1 preparing spinning solution, dissolving metal salt solution in ethanol and deionized water to prepare solution A, uniformly stirring, preparing solution B from polyvinylpyrrolidone and ethanol, and stirring for 2-4 hours; mixing the solution A and the solution B, and stirring for 3-5 hours to prepare a spinning solution;
s2, preparing ferrite fibers, preparing the spinning solution obtained in the step S1 into precursor fibers by adopting a sol electrospinning process, and calcining the precursor fibers at high temperature for 2-5 hours to obtain the ferrite fibers;
s3 preparing an absorbent, dispersing ferrite fiber into a solvent, adding barium salt and tetrabutyl titanate, adding a surfactant, adding the obtained solution into a reaction kettle, controlling the temperature at 150-180 ℃, preserving the heat for 6-12 hours, separating, washing and drying to obtain the ferrite and barium titanate composite fiber material.
Preferably, in step S1, the mass ratio of the polyvinylpyrrolidone to the ethanol in the solution B is 1: 8.
Preferably, in the step S2, the spinning solution is added into a syringe by using a sol electrospinning process, and the precursor fiber is prepared under the conditions of a voltage of 10-20kV, a receiving distance of 10-15cm, a needle diameter of 0.4-0.9mm, and a liquid outlet rate of 1 mL/h.
Preferably, the metal salt is one or more of nitrate or acetate of cobalt, iron, zinc, nickel.
Preferably, the elevated temperature is 550-.
Preferably, the solvent is one or both of ethanol and acetone.
Preferably, the barium salt is one or two of soluble barium nitrate and barium acetate.
Preferably, the surfactant is one or both of polyvinyl alcohol and polyethylene glycol.
Preferably, the solvent is controlled at 150 ℃ and 180 ℃ to prevent hydrolysis of tetrabutyl titanate.
The invention has the beneficial effects that:
(1) the high length-diameter ratio and the large specific surface area of the fiber are beneficial to improving the loading capacity of barium titanate particles;
(2) the ferrite/barium titanate composite fiber material prepared by the invention is beneficial to improving the load uniformity of barium titanate particles and limiting the size of the particles due to the high specific surface area of the fiber and the addition of the surfactant;
(3) the invention utilizes the electrospinning and solvothermal technologies to prepare the ferrite/barium titanate composite fiber material, has the advantages of wide raw material source, simple process, controllable technology and low cost, and is expected to realize large-scale production.
Drawings
Fig. 1 is an SEM image of a cobalt ferrite fiber material prepared by the present invention.
Fig. 2 is an XRD pattern of the cobalt ferrite fiber material prepared by the present invention.
FIG. 3 is an SEM image of a cobalt ferrite/barium titanate composite fiber prepared by the invention.
Detailed Description
Example 1
The microwave absorbent takes ferrite fibers as a carrier and loads barium titanate nanoparticles to prepare ferrite and barium titanate composite fibers.
A preparation method of a microwave absorbent based on cooperative coupling protection comprises the following steps:
s1, preparing a spinning solution, adding 2.91g of cobalt nitrate and 8.08g of ferric nitrate into 50mL of deionized water, and stirring for 30 minutes to obtain a solution A; weighing 1g of polyvinylpyrrolidone, adding the polyvinylpyrrolidone into 9ml of ethanol, and stirring for 3 hours to obtain a solution B; adding the solution B into the solution A, and stirring for 5 hours to obtain a spinning solution;
s2, preparing ferrite fibers, preparing precursor fibers by adopting a sol electrospinning process under the conditions of 15kV voltage, receiving distance of 15cm, needle diameter of 0.9mm and liquid outlet rate of 1mL/h, and calcining at 550 ℃ for 2h to obtain the ferrite fibers, wherein XRD (X-ray diffraction) and SEM (scanning Electron microscope) figures of the ferrite fibers are shown in figures 1 and 2;
s3 preparing an absorbent, weighing 50mg of ferrite fiber, dissolving in ethanol, adding 0.26g of barium nitrate, 0.34g of tetrabutyl titanate and 0.01g of polyethylene glycol 2000, adding the obtained solution into a reaction kettle, keeping the temperature at 150 ℃ for 6 hours, separating, washing and drying to obtain the ferrite and barium titanate composite fiber material, wherein the SEM is shown in figure 3.
The lowest reflectivity of the sample obtained in the embodiment within the range of 2-18GH reaches 89dB, and the effective absorption bandwidth is 5.2 GHz.
Example 2
The microwave absorbent takes ferrite fibers as a carrier and loads barium titanate nanoparticles to prepare ferrite and barium titanate composite fibers.
A preparation method of a microwave absorbent based on cooperative coupling protection comprises the following steps:
s1, preparing a spinning solution, adding 2.91g of cobalt nitrate and 8.08g of ferric nitrate into 50mL of deionized water, and stirring for 30 minutes to obtain a solution A; weighing 1g of polyvinylpyrrolidone, adding the polyvinylpyrrolidone into 9ml of ethanol, and stirring for 3 hours to obtain a solution B; adding the solution B into the solution A, and stirring for 3 hours to obtain a spinning solution;
s2, preparing ferrite fibers, preparing precursor fibers by adopting a sol electrospinning process under the conditions of 15kV voltage, receiving distance of 15cm, needle diameter of 0.9mm and liquid outlet rate of 1mL/h, and calcining at 550 ℃ for 2h to obtain the ferrite fibers;
s3 preparing an absorbent, weighing 50mg of ferrite fiber, dissolving in ethanol, adding 0.26g of barium nitrate, 0.34g of tetrabutyl titanate and 0.01g of polyethylene glycol 2000, adding the obtained solution into a reaction kettle, keeping the temperature at 150 ℃ for 6 hours, separating, washing and drying to obtain the ferrite and barium titanate composite fiber material.
The lowest reflectivity of the sample obtained in the embodiment in the range of 2-18GH reaches 60dB, and the effective absorption bandwidth is 3.4 GHz.
Example 3
The microwave absorbent takes ferrite fibers as a carrier and loads barium titanate nanoparticles to prepare ferrite and barium titanate composite fibers.
A preparation method of a microwave absorbent based on cooperative coupling protection comprises the following steps:
s1, preparing a spinning solution, namely adding 2.91g of nickel nitrate and 8.08g of ferric nitrate into 50mL of deionized water, and stirring for 30 minutes to obtain a solution A; weighing 1.25g of polyvinylpyrrolidone, adding the polyvinylpyrrolidone into 10.2ml of ethanol, and stirring for 3 hours to obtain a solution B; adding the solution B into the solution A, and stirring for 5 hours to obtain a spinning solution;
s2, preparing ferrite fibers, preparing precursor fibers by adopting a sol electrospinning process under the conditions of 20kV voltage, receiving distance of 15cm, needle diameter of 0.4mm and liquid outlet rate of 1mL/h, and calcining at 650 ℃ for 5h to obtain the ferrite fibers;
s3 preparing an absorbent, weighing 50mg of ferrite fiber, dissolving in ethanol, adding 0.13g of barium nitrate and 0.17g of tetrabutyl titanate, adding the obtained solution into a reaction kettle, keeping the temperature at 150 ℃ for 6h, separating, washing and drying to obtain the ferrite and barium titanate composite fiber material.
The lowest reflectivity of the sample obtained in the embodiment reaches 92dB in the range of 2-18GH, and the effective absorption bandwidth is 6.4 GHz.
Example 4
The microwave absorbent takes ferrite fibers as a carrier and loads barium titanate nanoparticles to prepare ferrite and barium titanate composite fibers.
A preparation method of a microwave absorbent based on cooperative coupling protection comprises the following steps:
s1, preparing a spinning solution, adding 2.91g of nickel nitrate and 3.8g of iron acetate into 50mL of deionized water, and stirring for 60 minutes to obtain a solution A; weighing 1g of polyvinylpyrrolidone, adding the polyvinylpyrrolidone into 9ml of ethanol, and stirring for 3 hours to obtain a solution B; adding the solution B into the solution A, and stirring for 4 hours to obtain a spinning solution;
s2, preparing ferrite fibers, preparing precursor fibers by adopting a sol electrospinning process under the conditions of 20kV voltage, receiving distance of 15cm, needle diameter of 0.4mm and liquid outlet rate of 1mL/h, and calcining at 600 ℃ for 3h to obtain the ferrite fibers;
s3 preparing an absorbent, weighing 50mg of ferrite fiber, dissolving in ethanol, adding 0.26g of barium nitrate and 0.34g of tetrabutyl titanate, adding the obtained solution into a reaction kettle, keeping the temperature at 120 ℃ for 12 hours, separating, washing and drying to obtain the ferrite and barium titanate composite fiber material.
The lowest reflectivity of the sample obtained in the embodiment in the range of 2-18GH reaches 42dB, and the effective absorption bandwidth is 2.4 GHz.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A microwave absorbent based on cooperative coupling protection is characterized in that: the microwave absorbent is a ferrite and barium titanate composite fiber prepared by taking ferrite fiber as a carrier and loading barium titanate nano particles.
2. A preparation method of a microwave absorbent based on cooperative coupling protection is characterized by comprising the following steps:
s1 preparing spinning solution, dissolving metal salt solution in ethanol and deionized water to prepare solution A, uniformly stirring, preparing solution B from polyvinylpyrrolidone and ethanol, and stirring for 2-4 hours; mixing the solution A and the solution B, and stirring for 3-5 hours to prepare a spinning solution;
s2, preparing ferrite fibers, preparing the spinning solution obtained in the step S1 into precursor fibers by adopting a sol electrospinning process, and calcining the precursor fibers at high temperature for 2-5 hours to obtain the ferrite fibers;
s3 preparing an absorbent, dispersing ferrite fiber into a solvent, adding barium salt and tetrabutyl titanate, adding a surfactant, adding the obtained solution into a reaction kettle, controlling the temperature at 150-180 ℃, preserving the heat for 6-12 hours, separating, washing and drying to obtain the ferrite and barium titanate composite fiber material.
3. The method for preparing the microwave absorbent based on the cooperative coupling protection as claimed in claim 2, wherein: in the step S1, the mass ratio of the polyvinylpyrrolidone to the ethanol in the solution B is 1: 8.
4. The method for preparing the microwave absorbent based on the cooperative coupling protection as claimed in claim 2, wherein: in the step S2, the spinning solution is added into an injector by adopting a sol electrospinning process, and precursor fibers are prepared under the conditions of 10-20kV voltage, receiving distance of 10-15cm, needle diameter of 0.4-0.9mm and liquid outlet rate of 1 mL/h.
5. The method for preparing the microwave absorbent based on the cooperative coupling protection as claimed in claim 2, wherein: the metal salt is one or more of nitrates or acetates of cobalt, iron, zinc and nickel.
6. The method for preparing the microwave absorbent based on the cooperative coupling protection as claimed in claim 2, wherein: the high temperature is 550-750 ℃.
7. The method for preparing the microwave absorbent based on the cooperative coupling protection as claimed in claim 2, wherein: the solvent is one or two of ethanol and acetone.
8. The method for preparing the microwave absorbent based on the cooperative coupling protection as claimed in claim 2, wherein: the barium salt is one or two of soluble barium nitrate and barium acetate.
9. The method for preparing the microwave absorbent based on the cooperative coupling protection as claimed in claim 2, wherein: the surfactant is one or two of polyvinyl alcohol and polyethylene glycol.
10. The method for preparing the microwave absorbent based on the cooperative coupling protection as claimed in claim 2, wherein: the solvent is controlled at 150 ℃ and 180 ℃ to prevent the tetrabutyl titanate from being hydrolyzed.
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| CN114481364A (en) * | 2021-12-31 | 2022-05-13 | 江苏大学 | Janus type electromagnetic coupling microwave absorbent and preparation method thereof |
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