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32results about How to "Enhanced interfacial polarization" patented technology
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Nanofiber/PVDF (polyvinylidene fluoride) compound medium with sandwich structure and preparation method of nanofiber/PVDF compound medium
InactiveCN107177144AImprove energy storage characteristicsHigh dielectric constantSynthetic resin layered productsLaminationQuenchingCalcination
The invention belongs to the field of a compound medium and particularly relates to a nanofiber / PVDF (polyvinylidene fluoride) compound medium with a sandwich structure and a preparation method of the nanofiber / PVDF compound medium. Upper and lower layers of the sandwich structure of the compound medium are PVDF films, a middle layer is a CFO@BZT-BCT NFs / PVDF compound medium film, and the three layers of structure media are combined through hot pressing, wherein the PVDF films are prepared with a solution tape casting method through quenching treatment, and the CFO@BZT-BCT NFs / PVDF compound medium film is prepared through steps as follows: crystalized BZT-BCT NFs is prepared from a BZT-BCT spinning precursor through electrostatic spinning and high-temperature calcination, CFO is introduced, CFO@BZT-BCT NFs is prepared and subjected to surface modification with dopamine hydrochloride, finally, CFO@BZT-BCT NFs is mixed with PVDF, suspension turbid colloid is prepared and subjected to solution tape casting and quenching treatment, and the nanofiber / PVDF compound medium is prepared. The technical problems of low energy density and high dielectric loss of an inorganic filling phase / polymer based compound medium are solved.
Owner:HARBIN UNIV OF SCI & TECH
Polyimide high-temperature dielectric composite film and preparation method thereof
The invention provides a polyimide high-temperature dielectric composite film and a preparation method thereof. The composite film is formed by blending at least one of hexagonal boron nitride nanosheet and molybdenum disulfide nanosheet as well as polyimide. The mass fraction of the hexagonal boron nitride nanosheet is 6% to 12%, and the mass fraction of the molybdenum disulfide nanosheet is 1% to 2%. The introduction of a nanosheet filler not only improves the thermal properties of a polyimide film, but also improves the high temperature dielectric properties that a conventional PI film hasnot been involved. The composite film has the advantages of low dielectric loss, high breakdown strength, energy storage density and energy storage efficiency at normal temperature, and keeps low conductance loss and high breakdown field strength and energy storage density at the temperature of 150 DEG C.
Owner:WUHAN UNIV OF TECH
Preparation method of graphene oxide-polyaniline composite electromagnetic shielding material
InactiveCN105273186AImprove conductivityEnhanced interfacial polarizationAmmonium sulfatePolyaniline composite
The invention discloses a preparation method of a graphene oxide-polyaniline composite electromagnetic shielding material. The method comprises the steps that ultrasonic dispersion is performed on graphene oxide in an aqueous perchloric acid solution, aniline is added, and the mixture is mixed evenly under magnetic stirring to obtain a first solution; ammonium persulfate is put into the aqueous perchloric acid solution, and ultrasonic dispersion is performed to obtain a second solution; the second solution is added in the first solution, continuous stirring and reacting are performed in an ice bath for 24 h to obtain a dispersing solution of a product, the dispersing solution is sequentially washed with deionized water, ethyl alcohol and acetone until the pH value is 6-7, filtering and drying are performed, and then the graphene oxide-polyaniline composite electromagnetic shielding material is obtained. According to the preparation method of the graphene oxide-polyaniline composite electromagnetic shielding material, a layer of directional polyaniline nanorods grow on the surface of the graphene oxide, the electric conductivity of the graphene oxide is improved through the conductive property of the polyaniline, interfacial polarization of contact layer faces of the graphene oxide and polyaniline is improved, and therefore the good electromagnetic wave shielding effectiveness is achieved; the technological processes are simple, the raw materials are easy to obtain, and application and popularization are easy.
Owner:ZHEJIANG UNIV
Heating modified MXene/ferroferric oxide composite wave-absorbing material and preparation method thereof
InactiveCN112047386AImproving Impedance MatchingImprove absorbing performanceMaterial nanotechnologyNanomagnetismDielectric lossTube furnace
The invention relates to a heating modified MXene / ferroferric oxide composite wave-absorbing material and a preparation method thereof. Magnetic ferroferric oxide particles (Fe3O4) are grown in situ on the surface of a two-dimensional material MXene (Ti3C2Tx), and the MXene is heated in a tubular furnace to be partially oxidized into titanium dioxide (TiO2) to finally obtain the layered compositematerial. MXene and TiO2 are dielectric loss wave-absorbing materials, and Fe3O4 is a magnetic loss wave-absorbing material, so that the obtained composite material can synergistically absorb electromagnetic waves through dielectric loss and magnetic loss mechanisms, and the wave-absorbing effect is enhanced. Meanwhile, the composite material has a layered structure, so that electromagnetic wavescan be subjected to multiple interlayer reflection in the composite material and are more easily absorbed by the composite material. And finally, the impedance matching of MXene is improved by Fe3O4 and TiO2, the interfacial polarization of the composite material is enhanced by the multi-component structure, and the wave absorbing effect of the composite material is further enhanced.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Multi-phase high-dielectric-constant composite material with isolation structure and preparation method thereof
The invention discloses a multi-phase high-dielectric-constant composite material with an isolation structure and a preparation method thereof. The material is prepared from, by mass, 0-10 parts of conducting packing, 10-50 parts of thermoplastic resin, 0-1 parts of an accelerant, 0-20 parts of a modifying agent, 0-20 parts of isolation balls, 50-100 parts of a curing agent and 100 parts of epoxy resin. By virtue of a suitable solvent and by means of a solution blending method, the modifying agent, the conducting packing, the thermoplastic resin and the epoxy resin are mixed to be uniform, the curing agent is added, the materials are mixed to be uniform, the mixture is poured into a mold and smeared into an electrode plate, heating is conducted for curing, and then the high-dielectric-constant multipolymer-based composite material with the isolation structure can be obtained. The block-shaped and film-shaped composite material can achieve the high dielectric constant and the low dielectric loss when the content of the conducting packing is low, is simple in preparation technology, easy to mold and process and short in molding period and has a very wide application prospect in the micro-electronics field and the motor and cable industries.
Owner:GUILIN UNIV OF ELECTRONIC TECH
Preparation method of POSS-CuPc-SiO2 modified epoxy resin composite material
The invention relates to the technical field of EP dielectric material synthesis, and discloses a preparation method of a POSS-CuPc-SiO2 modified epoxy resin composite material, which comprises the following steps: carrying out Michael addition reaction on a phenyl functional group of a PDA-SiO2 hybrid monomer and an amino functional group of amino copper phthalocyanine (NH2-CuPc) to obtain a polyaminated CuPc-SiO2 hybrid dielectric monomer; the preparation method comprises the following steps: carrying out substitution reaction on an amino functional group of a multi-aminated CuPc-SiO2 hybrid dielectric monomer and a chlorine functional group of a monofunctional group 3-chloropropyl POSS to obtain a POSS-CuPc-SiO2 hybrid dielectric monomer; a POSS-CuPc-SiO2 hybrid dielectric monomer is used as a filler, E51 epoxy resin is used as a polymer matrix, and the POSS-CuPc-SiO2 modified epoxy resin composite material with high dielectric constant and low dielectric loss is prepared.
Owner:陈全辉
Compound material with high energy density and preparation method thereof
The invention relates to the technical field of high polymer compound materials, in particular to a compound material with high energy density and a preparation method thereof. The compound material with high energy density is mainly obtained by mixing titanate particles of a core-shell structure with a high polymer; the titanate particles of the core-shell structure is obtained by coating silicondioxide on the surface of the titanate particles. According to the compound material with the high energy density and the preparation method thereof, the silicon dioxide serving as an insulating layer is coated on the surface of ultra-fine barium titanate particles to form the titanate of the core-shell structure, the local electric field concentration and electric charge accumulation can be effectively weakened, the formation of a leakage current passage is prevented, the dielectric loss is reduced, the voltage resistant performance of the material is wholly improved, and the homogeneous dispersion of titanate and high-interface compatibility brought by a silicon dioxide layer can improve the puncture of thin film; the titanate of the core-shell structure compounds with the high polymer,and the compound material with excellent energy storage performance can be obtained under the condition of lower filling quantity.
Owner:BEIJING UNIV OF POSTS & TELECOMM
Polymer-based composite dielectric material, preparation method thereof and energy storage device
PendingCN110713618AImprove energy storage efficiencyHigh energy storage densityCoatingsHigh energyInterfacial polarization
The invention discloses a polymer-based composite dielectric material, a preparation method thereof and an energy storage device. The polymer-based composite dielectric material comprises a laminatedstructure, the laminated structure is formed by alternately laminating first polymer layers and second polymer layers and then hot-pressing, the dielectric constant of the first polymer layers is higher than that of the second polymer layers, and the glass transition temperature of the first polymer layers and the glass transition temperature of the second polymer layers are both higher than 150 DEG C. The laminated structure adopted by the invention can improve the dielectric property and breakdown field strength of the composite dielectric material; the difference of dielectric constants between layers increases the interfacial polarization of the material, thereby improving the energy storage density of the material, and the polymer-based composite dielectric material provided by the invention can maintain high energy storage efficiency and high energy storage density at high temperature, and has a good application prospect in energy storage devices such as capacitors and the like.
Owner:SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
Silver-titanium dioxide filler doped polyvinylidene fluoride dielectric composite film and preparation method thereof
The invention discloses a silver-titanium dioxide filler doped polyvinylidene fluoride dielectric composite film and a preparation method thereof, and is characterized in that the composite film is compounded by filling a polyvinylidene fluoride matrix with a silver-titanium dioxide filler, and the silver-titanium dioxide filler is of a core-shell structure, wherein a core layer is a bark-shaped one-dimensional titanium dioxide nanowire with the surface coated with flaky titanium dioxide, a shell layer is silver nanoparticles modified on the surface of the flaky titanium dioxide, and the preparation method comprises the following steps: dispersing the prepared silver-titanium dioxide filler in an organic solvent N-N dimethylformamide, then performing ultrasonic stirring, adding polyvinylidene fluoride, stirring, and preparing a dielectric composite film of the silver-titanium dioxide filler doped with polyvinylidene fluoride by adopting a solution casting method, wherein the volume fraction of the silver-titanium dioxide filler is 0.5-2%. The material has the advantages of extremely high polarization, relatively high charging and discharging efficiency and extremely high energy density under relatively low electric field intensity.
Owner:NINGBO UNIV
Porous Co3O4/Al2SiO5 low-density wave-absorbing-type composite-phase ceramic and preparation method thereof
ActiveCN109650933AImprove absorbing performanceImproved interfacial polarization and dielectric loss capabilitiesCeramicwareDielectric lossTemperature resistance
The invention discloses a porous Co3O4 / Al2SiO5 low-density wave-absorbing-type composite-phase ceramic and a preparation method thereof. Particles of a Co3O4 wave-absorbing agent in the composite-phase ceramic are evenly dispersed in an Al2SiO5 ceramic fiberboard, which helps to improve the wave-absorbing performance of the material; the Co3O4 wave-absorbing agent in the composite ceramic has dielectric loss and magnetic loss on an electromagnetic wave; a layer of Co simple substance interface layer wraps the surface of each Co3O4 particle. The composite-phase ceramic material is low in density and good in high temperature resistance. According to the preparation method, a dipping method is adopted for introducing the wave-absorbing agent raw material into the porous ceramic, and the wave-absorbing agent in the obtained Co3O4 / Al2SiO5 composite-phase ceramic can be evenly dispersed, which helps to improve the wave-absorbing performance of the material; the selected porous Al2SiO5 ceramic fiberboard is used as a base material and has the advantages of being resistant to high temperature and low in density, in the preparation process, the shape and size of the Al2SiO5 ceramic fiberboard are not changed, and the composite-phase ceramic keeps low density; according to the method, the whole preparation technology is simple in step, short in period, easy to operate and good in repeatability.
Owner:SHAANXI UNIV OF SCI & TECH
Preparation method of copper and ceramic powder composite electromagnetic shielding material
ActiveCN110740626AEnhanced interfacial polarizationImprove electromagnetic shielding performanceMagnetic/electric field screeningEpoxyXylylene
The invention provides a preparation method of a copper and ceramic powder composite electromagnetic shielding material. The method comprises the steps that S1 an L-cysteine solution is prepared; S2 L-cysteine-coated CuS particles are prepared; S3 tartaric acid modified barium titanate is prepared; S4 components comprises, by weight, 60 to 75 parts of acrylic resin, 3 to 8 parts of 2,2,4-trimethy-l,3 pentanediol monoisobutyrate, 0.2 to 0.5 part of nonylphenol epoxy vinyl ether, 10 to 20 parts of ethyl acetate, 10 to 20 parts of xylene, 40 to 50 parts of L-cysteine-coated CuS particles and 35 to 45 parts of tartrate-modified barium titanate are weighed; and S5 the components are mixed, ball-milled in a ball-milling tank to prepare a electromagnetic shielding coating. The electromagnetic shielding material prepared by the method has the advantages of high shielding efficiency and good electrical conductivity.
Owner:YANGZHOUSRKLE INDAL
Ternary composite wave-absorbing material with core-shell structure and preparation method thereof
ActiveCN114044541AImprove conductivityEnhanced interfacial polarizationMaterial nanotechnologyShielding materialsMicrowaveCarbon nanofiber
The invention discloses a ternary composite wave-absorbing material with a core-shell structure. The wave-absorbing material comprises carbon nanofibers and spherical CoFe2O4@NiFe2O4 loaded on the surfaces of the carbon nanofibers, wherein the CoFe2O4@NiFe2O4 comprises a CoFe2O4 core and a NiFe2O4 shell coated on the surface of the CoFe2O4 core. According to the invention, the hard magnetic ferrite CoFe2O4 and the soft magnetic ferrite NiFe2O4 are utilized to generate an exchange coupling effect and form a core-shell structure, then the core-shell structure is further loaded on the surface of the carbon nanofiber, and the obtained CoFe2O4 and NiFe2O4 / CNFs ternary composite wave-absorbing material has good conductivity and magnetic performance and balanced impedance matching and attenuation constant. As a result, excellent microwave absorption performance and effective electromagnetic wave absorption frequency band width can be obtained, and good comprehensive use performance is shown.
Owner:WUHAN UNIV OF TECH
Wave-absorbing material derived from NiCo-MOF/biomass cotton and preparation method thereof
PendingCN113912038ALow densityAbsorbing frequency bandwidthTransportation and packagingMetal-working apparatusFiberCarbon fibers
The invention belongs to the technical field of electromagnetic wave absorbing materials, and discloses a wave absorbing material derived from NiCo-MOF / biomass cotton and a preparation method thereof. The preparation process is simple, low in cost and free of pollution, large-scale batch production can be achieved, and the prepared wave-absorbing material is small in density, wide in wave-absorbing frequency band and high in reflection loss. The NiCo@C wave-absorbing material prepared by the method disclosed by the invention has a large specific surface area and a multi-stage pore channel structure, and the electromagnetic wave absorption performance is greatly improved through the synergistic effect among nano-particles, nano-porous carbon and carbon fibers. Therefore, the wave-absorbing material not only paves a way for the development of the biomass as a green, low-cost and renewable high-performance carbon-based wave-absorbing material, but also provides a good design and manufacturing concept for the composite material of the electromagnetic wave-absorbing material.
Owner:ZHEJIANG UNIV OF TECH
Microcellular foaming HIPS electromagnetic shielding material as well as preparation method and application thereof
ActiveCN111961305AImprove electromagnetic shielding performanceExcellent electromagnetic shielding performance and stabilityMagnetic/electric field screeningSocial benefitsFoaming agent
The invention discloses a microcellular foaming HIPS electromagnetic shielding material and a preparation method and application thereof, and belongs to the technical field of preparation of functional polymer materials. The electromagnetic shielding material is prepared by the following steps: carrying out melt blending on HIPS, a foaming agent and a cross-linking agent to prepare a blend I; subjecting HIPS, a compatilizer, an electromagnetic shielding aid, an antioxidant, an activating agent, a nucleating agent and a lubricating agent to melt blending to prepare a blend II, and finally, mixing the blend I and the blend II and subjecting a product to microcellular foaming to prepare the material. The microcellular foaming HIPS electromagnetic shielding material prepared by the invention has high electromagnetic shielding effectiveness and excellent electromagnetic shielding effectiveness stability, can be widely applied to linings of shells of electric appliances such as household appliances, medical electric appliances, outdoor electric appliances, industrial and mining electric appliances and the like, and has relatively high economic value and social benefit. And the method plays a key role in a forced authentication requirement of each export country.
Owner:VIEW ELECTRONICS
Low-frequency wave-absorbing iron-based magnetic foam wave-absorbing material and preparation method thereof
ActiveCN114031927AGood suspensionEvenly distributedMagnetic/electric field screeningPolymer scienceFrequency wave
The invention belongs to the technical field of wave-absorbing materials, and particularly relates to a low-frequency wave-absorbing iron-based magnetic foam wave-absorbing material and a preparation method thereof. The iron-based magnetic foam wave-absorbing material is prepared from, by weight, 50-65 parts of iron-based magnetic powder, 15-20 parts of resin, 10-32 parts of aerogel, 10-15 parts of a dispersant, and 80-120 parts of an organic solvent, wherein the mass ratio of the iron-based magnetic powder to the aerogel is 1: (0.2-0.5). According to the iron-based magnetic foam wave-absorbing material disclosed by the invention, the iron-based magnetic powder is used as a main wave-absorbing material and is matched with the raw materials such as the foam resin and the aerogel, so that the obtained wave-absorbing material is uniform in texture, low in density and good in wave-absorbing performance; and the preparation method is simple in process, easy to process and suitable for large-scale production.
Owner:江西伟普科技有限公司
Preparation method of polyvinylidene fluoride composite material with high dielectric constant and low dielectric loss
InactiveCN106751243BEnhanced interfacial polarizationExcellent dielectric propertiesViscous liquidNano hybrid
A kind of preparation method of polyvinylidene fluoride composite material with high dielectric constant and low dielectric loss, the steps are: A, graphene oxide N, N-dimethylformamide solution preparation: the aqueous solution of graphene oxide and N , N-dimethylformamide is mixed and rotated under reduced pressure, and the distillate is ultrasonically treated; B, preparation of graphene oxide / silicon dioxide nano-hybrid material: get nano-silicon dioxide and add it to the graphene oxide of step A N,N-dimethylformamide solution, mechanical stirring and ultrasonic treatment, to obtain a suspension; C, preparation of polyvinylidene fluoride composite material: polyvinylidene fluoride is added to N,N-dimethylformamide In formamide, stir, while raising the temperature to 45-55°C; add the suspension prepared in step B, then stir and ultrasonically treat the mixture, heat the mixture to obtain a viscous liquid, and then dry the viscous liquid to obtain a dried product , and finally use a micro-twin-screw extruder to carry out melt blending, that is. The prepared product has high dielectric constant, low dielectric loss and good mechanical properties.
Owner:SOUTHWEST JIAOTONG UNIV
BaFe12O19 composite powder and preparation method thereof
The invention relates to a BaFe12O19 composite powder and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing BaFe12O19 / CaFe2O4 composite powder and nano cobalt ferrite powder, carrying out heat treatment at 480-550 DEG C for 3-5 hours to obtain powder, wherein x is 0.6-0.9; dissolving the powder in a hydrochloric acid solution, stirring uniformly, and adding aniline; and adding an ammonium persulfate hydrochloric acid solution under ice water bath conditions, and reacting for 10-15 hours. As the CoFe2O4 content increases, the interface of the composite powder increases; and meanwhile, the synergistic effect among different materials can enhance the doublet and interfacial polarization, so that the dielectric loss is enhanced, and the impedance matching characteristic is enhanced, thereby achieving the goal of optimizing the wave-absorbing property. The composite powder has excellent wave-absorbing property; the reflection loss can reach -23 to -38dB; and the preparation technique of the composite powder is simple.
Owner:SHAANXI UNIV OF SCI & TECH
A kind of multi-phase high dielectric constant composite material with isolation structure and its preparation method
Owner:GUILIN UNIV OF ELECTRONIC TECH
A kind of preparation method of composite electromagnetic shielding material of copper and ceramic powder
ActiveCN110740626BEnhanced interfacial polarizationImprove electromagnetic shielding performanceMagnetic/electric field screeningEpoxyXylylene
The invention provides a preparation method of a copper and ceramic powder composite electromagnetic shielding material. The method comprises the steps that S1 an L-cysteine solution is prepared; S2 L-cysteine-coated CuS particles are prepared; S3 tartaric acid modified barium titanate is prepared; S4 components comprises, by weight, 60 to 75 parts of acrylic resin, 3 to 8 parts of 2,2,4-trimethy-l,3 pentanediol monoisobutyrate, 0.2 to 0.5 part of nonylphenol epoxy vinyl ether, 10 to 20 parts of ethyl acetate, 10 to 20 parts of xylene, 40 to 50 parts of L-cysteine-coated CuS particles and 35 to 45 parts of tartrate-modified barium titanate are weighed; and S5 the components are mixed, ball-milled in a ball-milling tank to prepare a electromagnetic shielding coating. The electromagnetic shielding material prepared by the method has the advantages of high shielding efficiency and good electrical conductivity.
Owner:YANGZHOUSRKLE INDAL
Preparation method of POSS-copper phthalocyanine dielectric monomer modified polystyrene material
The invention relates to the technical field of high dielectric PS material synthesis, and discloses a preparation method of a POSS-copper phthalocyanine dielectric monomer modified polystyrene material, and the preparation method comprises the following steps: carrying out substitution elimination reaction on an amino functional group of amino copper phthalocyanine (NH2-CuPc) and a chloromethyl functional group of 4-chloromethyl styrene to obtain an octaaryl alkenyl copper phthalocyanine monomer; the preparation method comprises the following steps: carrying out hydrosilylation reaction on an aryl alkenyl functional group of an octaaryl alkenyl copper phthalocyanine monomer and a silicon hydrogen functional group of hydrogen-containing heptaphenyl cage-shaped silsesquioxane (POSS-H) to obtain a POSS-copper phthalocyanine dielectric monomer; the POSS-copper phthalocyanine dielectric monomer modified polystyrene material with high dielectric constant and low dielectric loss is prepared by taking a POSS-copper phthalocyanine dielectric monomer as a filler and polystyrene as a polymer matrix.
Owner:葛焕军
a porous co 3 o 4 / al 2 sio 5 Low-density wave-absorbing composite phase ceramics and preparation method thereof
ActiveCN109650933BLow densityImprove absorbing performanceCeramicwareComposite ceramicDielectric loss
Owner:SHAANXI UNIV OF SCI & TECH
High-dielectric low-loss resin-based nanocomposites for x-band and methods thereof
The invention discloses a high-dielectric and low-loss resin-based nanocomposite material used in the X-band and a method thereof. One of the preparation methods of the material is: hydrogen peroxide is used to hydroxylate the surface of the dielectric ceramic, and the hydroxylated ceramic Disperse in Tris-HCl buffer solution, add dopamine hydrochloride, make the hydroxylated ceramic surface form a polydopamine shell layer through in-situ polymerization reaction, use silver nitrate aqueous solution and ammonia water to make the dopamine-coated ceramic surface modified with nano-silver particles, and Acetone is used as a solvent to mix and dissolve the core-shell-satellite multi-level structure dielectric ceramic modified by nano-silver particles and thermosetting resin, and the composite material is obtained after removing acetone and gas. The invention improves its dielectric constant in the X-band (ε>8.6@10GHz), and at the same time better suppresses the dielectric loss (tanσ<0.04@10GHz), which is the design of high-frequency, high-dielectric and low-loss nanocomposite materials Provided new ideas.
Owner:ZHEJIANG UNIV
An iron-based magnetic foam absorbing material with low-frequency broadband absorbing performance and its preparation method
ActiveCN109517216BIncrease Loss MechanismEnhanced interfacial polarizationMagnetic/electric field screeningMicrowaveFirming agent
The invention discloses an iron-based magnetic foam wave-absorbing material with low-frequency broadband wave-absorbing performance and a preparation method thereof, belonging to the technical field of electromagnetic shielding and microwave loss functional materials. In this method, iron-based magnetic powder, resin, curing agent and suspending agent are first mixed, and ultrasonically mechanically stirred to form a uniform suspension slurry; the slurry is hung and applied to the template, and the remaining material is removed and then heated and solidified; the template is removed by high temperature and high pressure; foam reinforcement Resin is sucked into the surface micropores and the pores left after removing the template, and the mechanics are enhanced. The invention solves the problem that the flaky iron-based powder cannot be suspended in the solution by adding the suspending agent to the raw material and using ultrasonic mechanical stirring in the material-hanging process. The iron-based magnetic foam prepared by the invention has a low-frequency broadband wave-absorbing effect, and has better wave-absorbing performance in the 1.14-2.4GHz frequency band.
Owner:INST OF METAL RESEARCH - CHINESE ACAD OF SCI
Metal-carbon composite particle and preparation method and application thereof
PendingCN114346250AImprove microwave absorption performanceWide absorption bandwidthMagnetic/electric field screeningTransportation and packagingCarbon compositesNickel salt
The invention discloses a metal-carbon composite particle and a preparation method and application thereof. The preparation method of the metal-carbon composite particles comprises the following steps: 1) dispersing cobalt salt or / and nickel salt and trimesic acid in a solvent, and reacting to obtain cobalt or / and nickel-based MOF (Metal Organic Framework); and 2) calcining the cobalt or / and nickel-based MOF in a protective atmosphere to obtain the metal-carbon composite particles. The metal-carbon composite particle has the advantages of excellent microwave absorption performance, wide absorption bandwidth, good impedance matching performance, light weight and simple preparation method, can be used in electromagnetic wave absorption materials, and has a very wide application prospect.
Owner:GUANGDONG POLYTECHNIC NORMAL UNIV
Magnetic metal and carbon composite wave-absorbing material derived from layered double magnetic metal hydroxides and preparation method of magnetic metal and carbon composite wave-absorbing material
The invention discloses a layered double magnetic metal hydroxide derived magnetic metal and carbon composite wave-absorbing material and a preparation method thereof, the layered double magnetic metal hydroxide (LDH) is used as a precursor, and the magnetic metal and carbon composite wave-absorbing material with a multi-dimensional, multi-level and porous structure is synthesized through subsequent heat treatment. The preparation method is simple in process and low in cost, large-scale industrial production can be achieved, and the prepared composite wave-absorbing material is small in density, small in thickness, wide in effective absorption frequency band and high in reflection loss.
Owner:GUILIN UNIV OF ELECTRONIC TECH
A kind of polyionic liquid modified graphene/thermosetting resin composite material and preparation method thereof
ActiveCN105062070BImprove adsorption capacityImprove modification efficiencyIonic liquidElectric properties
The invention relates to a polyion liquid modified graphene / thermosetting resin composite and a preparation method thereof. The preparation method comprises the steps of mixing an N-vinyl heterocyclic compound and epoxy chloropropane, heating, and obtaining an ionic liquid monomer after ending reflux reaction; dissolving the ionic liquid monomer into methanol, and then, slowly adding a NaBF4 crystal to obtain an epoxy functionalized ionic liquid monomer; adding the epoxy functionalized ionic liquid monomer into a deionized water dispersing solution of graphene; then, adding an ethanol solution of azobisisobutyronitrile to obtain a polyion liquid modified graphene hybrid material with excellent electric properties, favorable dispersibility and good compatibility together with thermosetting resin; and after mixing, curing and aftertreating according to a thermosetting resin curing process to obtain the polyion liquid modified graphene / thermosetting resin composite with high dielectric constant, low dielectric loss and low percolation threshold. The preparation method of the composite is simple in process, controllable in reaction and short in period.
Owner:江苏立一新材料科技有限公司
Preparation process of anti-curling polyimide thin film
InactiveCN110551282AUniform particle size distributionEvenly dispersedPolyimide substratePolymer science
The invention relates to the technical field of preparation of polyimide thin films, in particular to a preparation process of an anti-curling polyimide thin film. The preparation process comprises the following steps: preparation of calcium molybdate nanopowder, preparation of modified nanopowder, synthesis of polymer resin, resin regulation and film formation. The surfaces of calcium molybdate nanoparticles are modified through KH550, the nanoparticles are prevented from being agglomerated in the polymer resin through volume steric hindrance of a long chain organic part, meanwhile, the compatibility between inorganic nanoparticle calcium molybdate and an organic polymer is also improved, and thus the nanoparticles are more evenly dispersed in a polyimide substrate; and a continuous and complete three-dimensional network is formed in the KH550-CaMoO4 nanoparticle polyimide substrate, thus the rigidity of polymer molecular chains is enhanced, acting force between the molecular chains is enhanced, energy needed for bending and cracking of the polymer molecular chains at the high temperature is increased, and the prepared thin film is good in anti-curling performance.
Owner:合肥中汇睿能能源科技有限公司
A kind of sandwich structure nanofiber/polyvinylidene fluoride composite medium and its preparation method
InactiveCN107177144BImprove energy storage characteristicsHigh dielectric constantSynthetic resin layered productsLaminationQuenchingCalcination
The invention belongs to the field of a compound medium and particularly relates to a nanofiber / PVDF (polyvinylidene fluoride) compound medium with a sandwich structure and a preparation method of the nanofiber / PVDF compound medium. Upper and lower layers of the sandwich structure of the compound medium are PVDF films, a middle layer is a CFO@BZT-BCT NFs / PVDF compound medium film, and the three layers of structure media are combined through hot pressing, wherein the PVDF films are prepared with a solution tape casting method through quenching treatment, and the CFO@BZT-BCT NFs / PVDF compound medium film is prepared through steps as follows: crystalized BZT-BCT NFs is prepared from a BZT-BCT spinning precursor through electrostatic spinning and high-temperature calcination, CFO is introduced, CFO@BZT-BCT NFs is prepared and subjected to surface modification with dopamine hydrochloride, finally, CFO@BZT-BCT NFs is mixed with PVDF, suspension turbid colloid is prepared and subjected to solution tape casting and quenching treatment, and the nanofiber / PVDF compound medium is prepared. The technical problems of low energy density and high dielectric loss of an inorganic filling phase / polymer based compound medium are solved.
Owner:HARBIN UNIV OF SCI & TECH
A high-performance giant electrorheological elastomer and its preparation and testing methods
ActiveCN113214648BOptimize the amount of additionSolve breakdown problemMaterial strength using tensile/compressive forcesElastomerChemical industry
The present invention relates to the technical field of chemical industry, in particular to a high-performance giant electrorheological elastomer and its preparation and testing method, comprising electrorheological particles, conductive metal particles, PDMS polymer and silicone oil; electrorheological particles and conductive metal particles form a bidisperse phase; PDMS polymer and silicone oil constitute a bicontinuous phase; electrorheological particles and conductive metal particles are dispersed in the bicontinuous phase; the material of the conductive metal particles includes gold and silver; the shape of the conductive metal particles includes flakes; the particle size of the conductive metal particles 0.1‑100 μm. The present invention has the following advantages: the compressive modulus in the direction parallel to the electric field and the shear modulus in the direction perpendicular to the electric field are improved by adding conductive metal particles and the optimized addition amount, and at the same time, the problem of conductive breakdown is avoided. The urea-coated barium titanyl oxalate has higher relative electrorheological effect, fast response to external electric field, good time stability and good self-healing property.
Owner:SHANGHAI UNIV
A kind of polyimide high temperature dielectric composite film and preparation method thereof
The invention provides a polyimide high-temperature dielectric composite film and a preparation method thereof. The composite film is formed by blending at least one of hexagonal boron nitride nanosheet and molybdenum disulfide nanosheet as well as polyimide. The mass fraction of the hexagonal boron nitride nanosheet is 6% to 12%, and the mass fraction of the molybdenum disulfide nanosheet is 1% to 2%. The introduction of a nanosheet filler not only improves the thermal properties of a polyimide film, but also improves the high temperature dielectric properties that a conventional PI film hasnot been involved. The composite film has the advantages of low dielectric loss, high breakdown strength, energy storage density and energy storage efficiency at normal temperature, and keeps low conductance loss and high breakdown field strength and energy storage density at the temperature of 150 DEG C.
Owner:WUHAN UNIV OF TECH
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