CN106751248A - A kind of cobalt ferrite/PVDF composite wave-suction materials and preparation method thereof - Google Patents

A kind of cobalt ferrite/PVDF composite wave-suction materials and preparation method thereof Download PDF

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CN106751248A
CN106751248A CN201611163654.1A CN201611163654A CN106751248A CN 106751248 A CN106751248 A CN 106751248A CN 201611163654 A CN201611163654 A CN 201611163654A CN 106751248 A CN106751248 A CN 106751248A
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pvdf
composite wave
cobalt ferrite
suction materials
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杨海波
韩宁
林营
刘潇
王晶晶
戴菁菁
高淑雅
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Shaanxi University of Science and Technology
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    • C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
    • C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
    • C08J2327/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C08J2327/16—Homopolymers or copolymers of vinylidene fluoride
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    • 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
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    • C08K2201/01—Magnetic additives
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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Abstract

A kind of cobalt ferrite/PVDF composite wave-suction materials and preparation method thereof, xCoFe is prepared by the tape casting2O4/ (1 x) PVDF thick films, wherein, x is CoFe2O4Mass percent, and 5%≤x≤35%.Then by organic matter and nano Co Fe2O4Powder mixes with PVDF powders, curtain coating, hot pressing, is then discharged out organic matter, and it is that chemical method prepares xCoFe to be used in the present invention2O4/ (1 x) PVDF mixtures, and the tape casting is used, prepare xCoFe2O4/ (1 x) PVDF thick films, chilling after vacuum drying, demoulding is hot-forming.Equipment is simple, and production efficiency is high, and automatization level is high, and performance is uniform, you can excellent and large-scale production the CoFe of absorbing property is obtained2O4Powder and PVDF powder composite wave-suction materials.

Description

A kind of cobalt ferrite/PVDF composite wave-suction materials and preparation method thereof
Technical field
The invention belongs to material science, it is related to a kind of cobalt ferrite/PVDF composite wave-suction materials and preparation method thereof.
Background technology
With the popularization of the high speed development and various electronic products of electronic information technology, electromagnetic wave is mutual between electronic product The survival and development of interference and the influence to environment also to the mankind bring very big harm so that absorbing material is increasingly subject to people Attention.Research shows that excessive electromagenetic wave radiation can cause nervous system, immune system, reproductive system and blood circulation The lesion of system, in some instances it may even be possible to induce various cancers in interior serious disease.The electromagnetic interference that electromagnetic wave causes can also influence to lead to News, Medical Devices, navigation equipment etc. is normally carried out.Therefore, absorbing material of the research and development with excellent properties, controls and net Change electromagnetic environment, there is huge meaning and value for military field and civil area.
Ferrite absorbing property is excellent, cheap, is a kind of more absorbing material of research.Ferritic absorbing property There is very big relation with chemical composition, particles size and distribution, pattern etc., but the shortcomings of density is big, hot properties is poor limits Its application.But, Ferrite Material has preferable band characteristic, and larger relative permeability and less relative dielectric is normal Number, can improve absorbing property by with other absorbents are compound.CoFe2O4As a kind of ferrite electromagnetic wave absorbent, mainly It typically has magnetic conductivity higher in high band to carry out electromagnetic wave absorption by domain wall resonance and natural resonance, and absorption efficiency is high, frequency Bandwidth be prepared into it is local low but its have the disadvantage than great and be difficult further broadening absorption band, make using being restricted.Will Nano Co Fe2O4It is compound with polymer to be made a nanometer phase composite absorber, can make up single nanometer phase absorbent be difficult to reach it is many Wave band, the deficiency of broadband assimilation effect realizes the increase widened with frequency range of frequency band.
PVDF is a kind of semicrystalline polymeric of function admirable, is a kind of preferable membrane material.PVDF has good Chemical stability and heat endurance, are widely used in the UF membranes such as Membrane Materials, gas separation, seepage slope, ultrafiltration, micro-filtration neck Domain.In PVDF surface loaded magnetics CoFe2O4Nano-particle, can not only improve magnetism of material energy, strengthen the magnetic loss of composite Consumption, you are conducive to the impedance matching of composite, and ferriferrous oxide particles reduce Graphene in drying as spacer medium During again stacking be in three-dimensional graphite structure, play considerable effect to stablizing graphene film Rotating fields.Therefore, study Scholars have carried out substantial amounts of research for the preparation of pvdf membrane.Ata M et al. are by C60Dimethyl second of the ultrasonic disperse in PVDF In acid amides (DMF) solution, even if solvent DMF is evaporated in vacuo the thin polymer film for obtaining also shows ferromagnetism at normal temperatures [Ata M,Machida M,Watanabe H,et al.Polymer-C60 Composite with Ferromagnetism.Japanese Journal of Applied Physics.pt Regular Papers&Short Notes,1994,33:1865-1871].Up to the present, the preparation method for preparing organic and inorganic magnetic Nano composite membrane is various It is various, mainly have following several：Sedimentation, biomimetic synthesis, template, electro-deposition combination templated synthesis, LB membrane technologies, DPN Controllable constructing technology of technology etc..But existing preparation method is promoting the ordered arrangement of nano-particle and is simplifying the side such as preparation condition Face is not enough, and absorption property is bad.
The content of the invention
It is an object of the invention to provide a kind of cobalt ferrite/PVDF composite wave-suction materials and preparation method thereof, using this side Method can prepare cobalt ferrite in uniform thickness/PVDF composite membranes, and the composite has preferable absorption property, and its work Skill equipment is simple, and reaction time is short, low production cost.
To reach above-mentioned purpose, present invention employs following technical scheme：
A kind of preparation method of cobalt ferrite/PVDF composite wave-suction materials, comprises the following steps：
Step 1：The dispersion of PVDF powders is configured to the suspending liquid A that concentration is 60~100g/L in acetone first1, then Stirred under heating, obtain solution A2；
Step 2：To solution A2Middle addition nano Co Fe2O4Powder, obtains mixed solution A3；By mixed solution A3Ultrasound point Dissipate, then stir, obtain uniform mixed solution B；
Wherein, by mass percentage, nano Co Fe2O4Powder is (5%~35%) with the mass ratio of PVDF powders： (65%~95%)；
Step 3：Mixed solution B is poured into paint roller, then open automatic film applicator carry out film, obtain cobalt ferrite/ PVDF composite wave-suction materials.
Of the invention further improvement is that the temperature heated in step 1 is 40~60 DEG C, the speed of stirring for 500~ 1000r/min, the time of stirring is 4~6h.
Of the invention further improvement be, the power of ultrasonic disperse is 5~20kHz, time of ultrasonic disperse for 5~ 10min。
Of the invention further improvement is that the speed stirred in step 2 is 500~1000r/min, and the time of stirring is 2~4h.
The present invention is further improved, CoFe2O4Particle diameter be 40~50nm.
Further improvement of the invention is that the molecular weight of PVDF is 44080, purity >=99.8% of acetone.
Of the invention further improvement be, the speed of film is 500~1200mm/min, the thickness of film for 100~ 300μm。
A kind of cobalt ferrite/PVDF composite wave-suction materials, the chemical expression of the composite wave-suction material is xCoFe2O4/(1-x) PVDF, wherein x are CoFe2O4Mass percent, and 5%≤x≤35%.
Compared with prior art, beneficial effects of the present invention are embodied in：
(1) it is of the invention by using casting method, by nano Co Fe2O4Powder is prepared into CoFe with PVDF powders2O4/ PVDF composite membranes, the composite membrane is fine and close, thickness is uniform, PVDF and CoFe2O4It is tightly combined, nano Co Fe can be made2O4Powder is carried out Oriented alignment, and with preferable absorption property, overcome nano-particle in the prior art cannot ordered arrangement problem；
(2) present invention can obtain the good CoFe of absorbing property at normal temperatures by film applicator2O4/ PVDF composite membranes, system Standby process is simple, easy to operate, raw material is easy to get, and preparation cost is relatively low, with vast potential for future development.
(3) present invention employs a kind of solution blended process, by inorganic nano-particle CoFe2O4It is jointly molten with polymer P VDF Solution can obtain cobalt ferrite/PVDF magnetic coupling solution in acetone solvent, then obtain cobalt ferrite/PVDF by the tape casting Composite magnetic coating, simplifies preparation condition, improves preparation technology.
Further, when drying, prior to 180~200 DEG C at it is dry during, PVDF has a process for phase transformation, so Afterwards by the cooling mode processed in ice bath, can be with the demoulding and densification.
Brief description of the drawings
Fig. 1 is 5%CoFe2O4/ 95%PVDF composite wave-suction materials, the hysteresis curve figure obtained by curtain coating.
Fig. 2 is 15%CoFe2O4/ 85%PVDF composite wave-suction materials, the hysteresis curve figure obtained by curtain coating.
Fig. 3 is 25%CoFe2O4/ 75%PVDF composite wave-suction materials, the hysteresis curve figure obtained by curtain coating.
Fig. 4 is 35%CoFe2O4/ 65%PVDF composite wave-suction materials, the hysteresis curve figure obtained by curtain coating.
Fig. 5 is 5%CoFe2O4/ 95%PVDF composite wave-suction materials thickness is the suction wave reflection loss figure of 2mm.
Fig. 6 is 5%CoFe2O4/ 95%PVDF composite wave-suction materials thickness is the suction wave reflection loss figure of 3mm.
Fig. 7 is 5%CoFe2O4/ 95%PVDF composite wave-suction materials thickness is the suction wave reflection loss figure of 4mm.
Fig. 8 is 15%CoFe2O4/ 85%PVDF composite wave-suction materials thickness is the suction wave reflection loss figure of 2mm.
Fig. 9 is 15%CoFe2O4/ 85%PVDF composite wave-suction materials thickness is the suction wave reflection loss figure of 3mm.
Figure 10 is 15%CoFe2O4/ 85%PVDF composite wave-suction materials thickness is the suction wave reflection loss figure of 4mm.
Figure 11 is 25%CoFe2O4/ 75%PVDF composite wave-suction materials thickness is the suction wave reflection loss figure of 2mm.
Figure 12 is 25%CoFe2O4/ 75%PVDF composite wave-suction materials thickness is the suction wave reflection loss figure of 3mm.
Figure 13 is 25%CoFe2O4/ 75%PVDF composite wave-suction materials thickness is the suction wave reflection loss figure of 4mm.
Figure 14 is 35%CoFe2O4/ 65%PVDF composite wave-suction materials thickness is the suction wave reflection loss figure of 2mm.
Figure 15 is 35%CoFe2O4/ 65%PVDF composite wave-suction materials thickness is the suction wave reflection loss figure of 3mm.
Figure 16 is 35%CoFe2O4/ 65%PVDF composite wave-suction materials thickness is the suction wave reflection loss figure of 4mm.
Specific embodiment
By specific embodiment, the present invention is described in detail below in conjunction with the accompanying drawings.
The detailed process that the present invention is tested is：The dry film that the present invention is obtained is built up into square, external diameter is put into Be 7mm, in the mould of 3mm, the thickness that hot pressing obtains test sample is the ring of 2~5mm to internal diameter, the temperature of hot pressing for 180~ 200 DEG C, pressurize 0.6MPa, is tested after pressurize 50s~2min
Embodiment 1
(1) (molecular weight is 44080,155~160 DEG C of fusing point, is bought in Alfa to select PVDF (polyvinylidene fluoride) powder Aesar), nano Co Fe2O4(particle diameter is 40nm to powder, and purity is 99.5%) and acetone (purity >=99.8%) is raw material.
(2) PVDF powders are dispersed in 15mL acetone first, are configured to the suspending liquid A that concentration is 66.7g/L1, then 4h is stirred on magnetic stirrer in heating, solution A is obtained2, the temperature of heating is 40 DEG C, and the speed of stirring is 500r/min.
(3) to solution A2Middle addition nano Co Fe2O4Powder obtains mixed solution A3, wherein, by mass percentage, CoFe2O4The mass percent of powder is 95% for the mass percent of 5%, PVDF powders；By mixed solution A3Under 10kHz Ultrasonic disperse 5min, then stirs 2h with electric mixer in the case where stir speed (S.S.) is 500r/min, obtains mixed solution B.
(4) mixed solution B is poured into paint roller, then opens automatic film applicator, during film, film speed is 800mm/min, coating thickness is 200 μm, obtains film, as obtains cobalt ferrite/PVDF composite wave-suction materials.
(5) film is put into vacuum drying chamber in 5min is dried at 180 DEG C, then ice-water bath quenching 2min, will shell The film for falling be placed in electric drying oven with forced convection with 40 DEG C at dry 6h.
(6) dry film is built up into square, is put into external diameter for 7mm, during internal diameter is for the mould of 3mm, being hot pressed into thickness is The ring of 2.5mm, the temperature of hot pressing is 180 DEG C, and pressurize 0.6MPa, is tested after pressurize 50s.
It will be seen from figure 1 that 5%CoFe2O4The saturation magnetization of/95%PVDF composite wave-suction materials is 4.0emu/g, Remanent magnetization is 2.6emu/g, and coercive field is 1662Oe.
From fig. 5, it can be seen that 5%CoFe2O4/ 95%PVDF composite wave-suction materials thickness is 2mm, maximum in 4.4GHz Reflection loss -10.8dB.
From fig. 6, it can be seen that 5%CoFe2O4/ 95%PVDF composite wave-suction materials thickness is 3mm, maximum in 4.4GHz Reflection loss -21.2dB.
From figure 7 it can be seen that 5%CoFe2O4/ 95%PVDF composite wave-suction materials thickness is 4mm, maximum in 4.5GHz Reflection loss -26.1dB.
Embodiment 2
(1) (molecular weight is 44080,155~160 DEG C of fusing point, is bought in Alfa to select PVDF (polyvinylidene fluoride) powder Aesar), nano Co Fe2O4(particle diameter is 40nm to powder, and purity is 99.5%) and acetone (purity >=99.8%) is raw material；
(2) PVDF powders are dispersed in 13mL acetone first, are configured to the suspension that mixed powder concentration is 76.9g/L A1, 6h is then stirred on magnetic stirrer in heating, obtain homogeneous solution A2, the temperature of heating is 60 DEG C, and the speed of stirring is 500r/min。
(3) to solution A2Middle addition nano Co Fe2O4Powder obtains mixed solution A3, wherein, by mass percentage, CoFe2O4The mass percent of powder is 85% for the mass percent of 15%, PVDF powders；By mixed solution A3Under 10kHz Ultrasonic disperse 8min, then stirs 2h and obtains uniform mixed solution B with electric mixer in the case where stir speed (S.S.) is 500r/min.
(4) mixed solution B is poured into paint roller, then opens automatic film applicator, during film, film speed is 800mm/min, coating thickness is 210 μm, obtains film, as obtains cobalt ferrite/PVDF composite wave-suction materials；
(5) film is put into vacuum drying chamber in 8min is dried at 190 DEG C, then ice-water bath quenching 3min, will shell The film for falling be placed in electric drying oven with forced convection with 60 DEG C at dry 4h.
(6) square will be built up, external diameter will be put into for 7mm, during internal diameter is for the mould of 3mm, it will be 2.8mm's to be hot pressed into thickness Ring, the temperature of hot pressing is 185 DEG C, and pressurize 0.6MPa, is tested after pressurize 55s.
Figure it is seen that 15%CoFe2O4The saturation magnetization of/85%PVDF composite wave-suction materials is 4.8emu/ G, remanent magnetization is 3.1emu/g, and coercive field is 1686Oe.
From figure 8, it is seen that 15%CoFe2O4/ 85%PVDF composite wave-suction materials thickness is 2mm, in 6.3GHz, most Big reflection loss -9.6dB.
From fig. 9, it can be seen that 15%CoFe2O4/ 85%PVDF composite wave-suction materials thickness is 3mm, in 6.3GHz, most Big reflection loss -19.4dB.
From fig. 10 it can be seen that 15%CoFe2O4/ 85%PVDF composite wave-suction materials thickness is 4mm, in 6.4GHz, most Big reflection loss -27.1dB.
Embodiment 3
(1) (molecular weight is 44080,155~160 DEG C of fusing point, is bought in Alfa to select PVDF (polyvinylidene fluoride) powder Aesar), nano Co Fe2O4(particle diameter is 40nm to powder, and purity is 99.5%) and acetone (purity >=99.8%) is raw material；
(2) PVDF powders are dispersed in 12.5mL acetone first, are configured to the suspension that mixed powder concentration is 80g/L A1, 4h is then stirred on magnetic stirrer in heating, obtain homogeneous solution A2, the temperature of heating is 40 DEG C, and stir speed (S.S.) is 550r/min。
(3) to solution A2Middle addition nano Co Fe2O4Powder obtains mixed solution A3, wherein, by mass percentage, CoFe2O4The mass percent of powder is 75% for the mass percent of 25%, PVDF powders；By solution A3Ultrasound point under 10kHz 8min is dissipated, then 6h is stirred in the case where stir speed (S.S.) is 600r/min with electric mixer and is obtained uniform mixed solution B.
(4) mixed solution B is poured into paint roller, then opens automatic film applicator, during film, film speed is 800mm/min, coating thickness is 220 μm, obtains film, as obtains cobalt ferrite/PVDF composite wave-suction materials；
(5) film is put into vacuum drying chamber in 9min is dried at 190 DEG C, then ice-water bath quenching 2min, will shell The film for falling be placed in electric drying oven with forced convection with 60 DEG C at dry 5h.
(6) dry film is built up into square, is put into external diameter for 7mm, during internal diameter is for the mould of 3mm, being hot pressed into thickness is The ring of 2.8mm, the temperature of hot pressing is 200 DEG C, and pressurize 0.6MPa, is tested after pressurize 1.5min.
From figure 3, it can be seen that 25%CoFe2O4The saturation magnetization of/75%PVDF composite wave-suction materials is 6.9emu/ G, remanent magnetization is 4.8emu/g, and coercive field is 1710Oe.
It can be seen from figure 11 that 25%CoFe2O4/ 75%PVDF composite wave-suction materials thickness is 2mm, in 5.1GHz, most Big reflection loss -13.4dB.
It can be recognized from fig. 12 that 25%CoFe2O4/ 75%PVDF composite wave-suction materials thickness is 3mm, in 5.2GHz, most Big reflection loss -17.2dB.
As can be seen from Figure 13,25%CoFe2O4/ 75%PVDF composite wave-suction materials thickness is 4mm, in 5.4GHz, most Big reflection loss -21.7dB.
Embodiment 4
(1) (molecular weight is 44080,155~160 DEG C of fusing point, is bought in Alfa to select PVDF (polyvinylidene fluoride) powder Aesar), nano Co Fe2O4(particle diameter is 40nm to powder, and purity is 99.5%) and acetone (purity >=99.8%) is raw material.
(2) PVDF powders are dispersed in 10mL acetone first, are configured to the suspension that mixed powder concentration is 100g/L A1, 4h is then stirred on magnetic stirrer in heating, obtain homogeneous solution A2, the temperature of heating is 40 DEG C, and stir speed (S.S.) is 600r/min。
(3) to solution A2Middle addition nano Co Fe2O4Powder obtains mixed solution A3, wherein, by mass percentage, CoFe2O4The mass percent of powder is 65% for the mass percent of 35%, PVDF powders；By solution A3The ultrasound under 10kHz Dispersion 10min, then stirs 6h and obtains uniform mixed solution B with electric mixer in the case where stir speed (S.S.) is 800r/min.
(4) mixed solution B is poured into paint roller, then opens automatic film applicator, during film, film speed is 800mm/min, coating thickness is 220 μm, obtains film, as obtains cobalt ferrite/PVDF composite wave-suction materials；
(5) film is put into vacuum drying chamber in 10min is dried at 200 DEG C, then ice-water bath quenching 5min, will shell The film for falling be placed in electric drying oven with forced convection with 80 DEG C at dry 4h.
(6) square will be built up, external diameter will be put into for 7mm, during internal diameter is for the mould of 3mm, it will be 2.5mm's to be hot pressed into thickness Ring, the temperature of hot pressing is 180 DEG C, and pressurize 0.6MPa, is tested after pressurize 2min.
From fig. 4, it can be seen that 35%CoFe2O4The saturation magnetization of/65%PVDF composite wave-suction materials is 9.6emu/ G, remanent magnetization is 6.4emu/g, and coercive field is 1724Oe.
It is seen from figure 14 that 35%CoFe2O4/ 65%PVDF composite wave-suction materials thickness is 2mm, in 5.8GHz, most Big reflection loss -12.9dB.
It can be seen from fig. 15 that 35%CoFe2O4/ 65%PVDF composite wave-suction materials thickness is 3mm, in 5.9GHz, most Big reflection loss -22.9dB.
As can be seen from Figure 16,35%CoFe2O4/ 65%PVDF composite wave-suction materials thickness is 4mm, in 6.1GHz, most Big reflection loss -31.7dB.
Embodiment 5
A kind of preparation method of cobalt ferrite/PVDF composite wave-suction materials, comprises the following steps：
Step 1：The PVDF powders that molecular weight is 44080 are dispersed in acetone (purity >=99.8% of acetone) are first matched somebody with somebody It is made the suspending liquid A that concentration is 60g/L1, 5h is stirred under then being heated at 45 DEG C, obtain solution A2；Wherein, the speed of stirring is 1000r/min；
Step 2：To solution A2It is middle to add the nano Co Fe that particle diameter is 40~50nm2O4Powder, obtains mixed solution A3；Will Mixed solution A3The ultrasonic disperse 10min in the case where power is 5kHz, then stirs 2h, obtains uniform mixed solution B；Wherein, stir The speed mixed is 1000r/min；
Wherein, by mass percentage, nano Co Fe2O4Powder is 20% with the mass ratio of PVDF powders：80%；
Step 3：Mixed solution B is poured into paint roller, then open automatic film applicator carry out film, obtain cobalt ferrite/ PVDF composite wave-suction materials；Wherein, the speed of film is 500mm/min, and the thickness of film is 300 μm.
Embodiment 6
A kind of preparation method of cobalt ferrite/PVDF composite wave-suction materials, comprises the following steps：
Step 1：The PVDF powders that molecular weight is 44080 are dispersed in acetone (purity >=99.8% of acetone) are first matched somebody with somebody It is made the suspending liquid A that concentration is 90g/L1, 6h is stirred under then being heated at 50 DEG C, obtain solution A2；Wherein, the speed of stirring is 800r/min；
Step 2：To solution A2It is middle to add the nano Co Fe that particle diameter is 40~50nm2O4Powder, obtains mixed solution A3；Will Mixed solution A3The ultrasonic disperse 5min in the case where power is 20kHz, then stirs 4h, obtains uniform mixed solution B；Wherein, stir The speed mixed is 700r/min；
Wherein, by mass percentage, nano Co Fe2O4Powder is 30% with the mass ratio of PVDF powders：70%；
Step 3：Mixed solution B is poured into paint roller, then open automatic film applicator carry out film, obtain cobalt ferrite/ PVDF composite wave-suction materials；Wherein, the speed of film is 1200mm/min, and the thickness of film is 100 μm.
The chemical expression of cobalt ferrite/PVDF composite wave-suction materials prepared by the present invention is xCoFe2O4/ (1-x) PVDF, its Middle x is CoFe2O4Mass percent, and 5%≤x≤35%.

Claims (8)

1. the preparation method of a kind of cobalt ferrite/PVDF composite wave-suction materials, it is characterised in that comprise the following steps：
Step 1：The dispersion of PVDF powders is configured to the suspending liquid A that concentration is 60~100g/L in acetone first1, then heat Under stir, obtain solution A2；
Step 2：To solution A2Middle addition nano Co Fe2O4Powder, obtains mixed solution A3；By mixed solution A3Ultrasonic disperse, so After stir, obtain uniform mixed solution B；
Wherein, by mass percentage, nano Co Fe2O4Powder is (5%~35%) with the mass ratio of PVDF powders：(65%~ 95%)；
Step 3：Mixed solution B is poured into paint roller, then opening automatic film applicator carries out film, obtains cobalt ferrite/PVDF multiple Close absorbing material.
2. a kind of preparation method of cobalt ferrite/PVDF composite wave-suction materials according to claim 1, it is characterised in that step The temperature heated in rapid 1 is 40~60 DEG C, and the speed of stirring is 500~1000r/min, and the time of stirring is 4~6h.
3. the preparation method of a kind of cobalt ferrite/PVDF composite wave-suction materials according to claim 1, it is characterised in that super The scattered power of sound is 5~20kHz, and the time of ultrasonic disperse is 5~10min.
4. a kind of preparation method of cobalt ferrite/PVDF composite wave-suction materials according to claim 1, it is characterised in that step The speed stirred in rapid 2 is 500~1000r/min, and the time of stirring is 2~4h.
5. the preparation method of a kind of cobalt ferrite/PVDF composite wave-suction materials according to claim 1, it is characterised in that CoFe2O4Particle diameter be 40~50nm.
6. the preparation method of a kind of cobalt ferrite/PVDF composite wave-suction materials according to claim 1, it is characterised in that The molecular weight of PVDF is 44080, purity >=99.8% of acetone.
7. the preparation method of a kind of cobalt ferrite/PVDF composite wave-suction materials according to claim 1, it is characterised in that apply The speed of film is 500~1200mm/min, and the thickness of film is 100~300 μm.
8. cobalt ferrite/PVDF composite wave-suction materials that prepared by a kind of method as claimed in claim 1, it is characterised in that this is combined The chemical expression of absorbing material is xCoFe2O4/ (1-x) PVDF, wherein x are CoFe2O4Mass percent, and 5%≤x≤ 35%.
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CN114566589A (en) * 2022-01-25 2022-05-31 西南交通大学 Biological material with magnetoelectric effect and preparation method thereof

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CN112823856A (en) * 2019-11-21 2021-05-21 苏州顺创新能源科技有限公司 Hydrophilic PVDF film and preparation method thereof
CN114566589A (en) * 2022-01-25 2022-05-31 西南交通大学 Biological material with magnetoelectric effect and preparation method thereof
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