CN103112904B - Preparation method of nano Fe3O4 powder for preparation of nano dielectric medium through compounding with polyethylene - Google Patents

Preparation method of nano Fe3O4 powder for preparation of nano dielectric medium through compounding with polyethylene Download PDF

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CN103112904B
CN103112904B CN201310058669.1A CN201310058669A CN103112904B CN 103112904 B CN103112904 B CN 103112904B CN 201310058669 A CN201310058669 A CN 201310058669A CN 103112904 B CN103112904 B CN 103112904B
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nanometer
powder
polyethylene
dielectric
nano
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CN103112904A (en
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张冬
宋伟
孙志
韩柏
何丽娟
王暄
蒋强
张颖
雷清泉
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Harbin University of Science and Technology
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Harbin University of Science and Technology
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Abstract

The invention provides a preparation method of nano Fe3O4 powder for preparation of a nano dielectric medium through compounding with polyethylene by using surface modification agent, relates to a preparation method of nano Fe3O4 powder, and aims to solve the problems that Fe3O4 magnetic nano particles are poor in compatibility and prone to aggregation with low density polyethylene before surface treatment is performed at present. The method comprises the following steps: 1, weighing; 2, preparing a mixed solution; 3, preparing a nano Fe3O4 preform; and 4, preparing the nano Fe3O4 powder. The invention accurately controls the particle size of the prepared nano Fe3O4 powder and selects an appropriate surface modifier for the surface modification of the nano Fe3O4 powder, so that the surface of the nano Fe3O4 powder is coated with special functional groups having favorable compatibility with low density polyethylene; and meanwhile, the surface modifier can also achieve the effects of inhibiting the aggregation of the nano Fe3O4 powder and accurately controlling the particle size of the nano Fe3O4 powder. The invention is used for preparing the nano Fe3O4 powder for preparation of a nano dielectric medium through well compounding with polyethylene.

Description

A kind of can with the dielectric nanometer Fe of the compound preparation nanometer of polyethylene 3o 4the method of powder
Technical field
The present invention relates to nanometer Fe 3o 4the preparation method of powder.
Background technology
Nanometer dielectric medium, as insulating material, progressively substituting traditional insulating material has become the dielectric inevitable development trend of research and development High Performance Insulation.Compare with traditional micron order mixture based dielectric material, in nanometer dielectric medium nanoparticle specific surface area large, active high and be easy to and matrix superpolymer between form huge interface region, produce the complicated interface structure that interaction force is strong, therefore can be from different aspect, improving in varying degrees dielectric electrical property.At present, majority utilizes nanotechnology to carry out modification to performances such as the electricity of polymer-based carbon insulation dielectric, heat, machineries, and has obtained certain effect.Nanometer dielectric medium mainly concentrates on the following aspects in the application in electric insulation field: 1. high voltage rotating machine insulation.Nanometer dielectric medium can dwindle motor size, improves running reliability of motor, reduce costs, and the good aging resistance of resistance to corona and the heat conductivility of nanometer dielectric medium, can extend the electrical machine insulation life-span; 2. high pressure is extruded cable insulation.Nanometer dielectric medium, suppressing space charge accumulation, reduce specific inductivity, improving the aspect successfuls such as breakdown performance, can improve cable running voltage grade and reliability; 3. mesolow is extruded cable insulation.Nanometer dielectric medium has excellent water-fast and resistance to environmental aging performance; 4. capacitor insulation.Using nanometer dielectric medium as the dielectric of electrical condenser, can relatively improve the loss of its energy storage density (the nanometer dielectric medium of application super large specific inductivity) and electrical condenser voltage withstand class and reduction alternating electromotive force electrical condenser etc.; 5. molding high potential assembly and annex dielectric thereof.The dielectric use of nanometer can improve over-all properties and the reliability of power equipment.
Along with nanometer dielectric medium research deeply and the demand of power industry, nanometer dielectric medium future developing trend can be divided into following several stages: 1. primary stage (at present), the nanometer dielectric substance that can simultaneously improve electricity, heat and mechanical property with inorganic nanoparticles doping preparation, is mainly used in enamel insulation, electric classification, electromagnetic shielding; 2. intermediate stage, prepares the nanometer dielectric medium with anisotropy thermal conductivity with one dimension or the doping of two-dimensional nano filler, is mainly used in cable and high-tension electric motor insulation; 3. advanced stage, with Supramolecular Assembling legal system, for nanometer dielectric substance, be mainly used in ultracapacitor, electrostriction material, sensor, intelligent adaptive dielectric substance etc.
Low Density Polyethylene (LDPE) is widely used in high voltage power cable with its good dielectric and mechanical property, and it is also one of most widely used polymer materials in electric insulation field.The nanometer dielectric medium that inorganic nano particle modified polyethylene (PE) makes can be when improving its heat, machinery, fire-retardant, resistance to environmental aging performance, significantly improve its dielectric properties, as improve breaking down field strength, strengthen the aging and resistant to partial discharges ability of resistance to electric branch, suppress space charge accumulation etc., this is of great significance improving insulating material performance tool, and the research of LDPE base nanocomposite dielectric starts to be subject to the extensive concern of Chinese scholars thus.The dielectric development of nanometer is still at present the main primary stage in take the nanometer dielectric substance that inorganic nanoparticles doping preparation can improve electricity, heat and mechanical property simultaneously.The dielectric research of PE base nanometer is no exception, still rests on to take metal oxide (MO) system and be that main inorganic nano-particle carries out the modification stage to it.Due to these conventional MO particles, as polynite (MMT), TiO 2, MgO, ZnO, SiO 2, BaTiO 3, Al 2o 3deng, can not make PE base nanometer dielectric substance present obvious anisotropy, thereby also can only rest on electricity, heat, mechanical property synthetic study stage to the research of PE base nanometer dielectric substance.How to break this deadlock, be beneficial to nanoparticle plating property and give nanometer dielectric medium obvious anisotropic properties, promotion to higher development, becomes a problem that is worth everybody thinking to its research.Fe 3o 4nanoparticle as a kind of special MO particle, has small-size effect and the special magnetic property of nanoparticle simultaneously, may make this nanometer dielectric medium have magnetic itself and the compound nanometer dielectric medium that makes of LDPE, is beneficial to and realizes anisotropic properties.But the specific surface area of nanometer MO particle own is very large, there is special surface properties, as: nanoparticle is in upper state, system has very large surperficial Gibbs free energy, for thermodynamic unstable system, can spontaneously reunite, oxidation or surface adsorption to be to reduce surperficial unsettled atomicity, reduces the energy of system.So, although the synthetic method of nanoparticle is a lot, without the nanoparticle before surface treatment, there is the shortcomings such as poor, the easy reunion of consistency, life-span be short.As: Fe 3o 4magnetic nano-particle consistency before without surface treatment is poor, easily reunite, and therefore must carry out special modification to its surface, to improve its consistency, dispersion stabilization and biocompatibility.
In this area research, name of document is < < modified Nano Fe 3o 4the dielectric spectrum analysis > > that forms complex media with Low Density Polyethylene discloses a kind of Fe 3o 4with the preparation method of LDPE Composite, but composition and the consumption thereof of the tensio-active agent of itself and unexposed concrete use; Name of document is < < Synthesis of Fe 3o 4nanoparticles from emulsions > > discloses a kind of emulsion method and has prepared Fe 3o 4the method of nanoparticle.
Summary of the invention
The present invention will solve at present because of Fe 3o 4magnetic nano-particle consistency before without surface treatment is poor, the problem of easy reunion, and provide utilize coating materials prepare a kind of can with the dielectric nanometer Fe of the compound preparation nanometer of polyethylene 3o 4the method of powder.
Utilize coating materials prepare a kind of can with the dielectric nanometer Fe of the compound preparation nanometer of polyethylene 3o 4the method of powder, specifically according to following steps, prepare:
One, take by weight 9 parts～11 parts FeSO 4, 10 parts～25 parts of FeCl 3, 1 part～3 parts of coating materialss and 25 parts～40 parts saturated ammoniacal liquor;
Two, FeSO step 1 being taken 4be dissolved in and in distilled water, obtain FeSO 4solution, FeCl 3be dissolved in and in distilled water, obtain FeCl 3solution, wherein, FeSO 4feSO in solution 4with the weight ratio of distilled water be 1:1～3, FeCl 3feCl in solution 3with the weight ratio of distilled water be 1:1～3, then by FeSO 4solution and FeCl 3solution mixes and obtains mixing solutions;
Three, under agitation condition, the mixing solutions that step 2 is obtained joins in the saturated ammoniacal liquor that step 1 takes, and is then warming up to 60 ℃～80 ℃, then the coating materials that adds step 1 to take, insulation 30min～60min, obtains the nanometer Fe that particle diameter is 15nm～20nm 3o 4precast body;
Four, nanometer Fe step 3 being obtained 3o 4precast body vacuum filtration, then cleans 2～5 times with the distilled water that temperature is 60 ℃～90 ℃, then through vacuum-drying, obtain utilizing coating materials prepare a kind of can with the dielectric nanometer Fe of the compound preparation nanometer of polyethylene 3o 4powder.
Above-mentioned nanometer Fe 3o 4the dielectric method of the compound preparation nanometer of powder and polyethylene, specifically according to following steps, prepare:
A, nanometer Fe prepared by claim 1 3o 4powder and polyethylene premix, then add in twin screw extruder, in temperature, is blend 0.8h～1.2h under 155 ℃～165 ℃ conditions, and control screw torque is 55r/min～65r/min, and taking-up, granulation, obtain composite particles;
B, composite particles hot pressing film forming on vulcanizing press that steps A is obtained, controlling temperature is 120 ℃～140 ℃, and pressure is 9MPa～11MPa, and hot pressing time is 19min～21min, obtains polyethylene/Fe that thickness is 0.1mm～0.2mm 3o 4nano compound film, is nanometer dielectric medium.
The invention has the beneficial effects as follows: the present invention accurately controls the nanometer Fe of preparation 3o 4the particle diameter of powder, and select suitable coating materials to modify its surface, its surface being coated with and can thering is with polyethylene the specific functional groups of excellent compatibility, this coating materials can also play and suppress nano level Fe simultaneously 3o 4powder ball is polymerized to piece, accurately controls nano level Fe 3o 4the effect in powder footpath, and then can be by by itself and the compound nanocomposite dielectric that makes of polyethylene, can be when improving hot, mechanical, fire-retardant, the resistance to environmental aging of LDPE matrix, dielectric properties to this nanocomposite dielectric, have again nano ferriferrous oxide particle paramagnetism, can give this nanocomposite dielectric anisotropic properties by externally-applied magnetic field, realize the regulation and control to its macro property.
The present invention for the preparation of can with the dielectric nanometer Fe of the compound preparation nanometer of polyethylene 3o 4powder.
Accompanying drawing explanation
Fig. 1 is the nanometer Fe of embodiment mono-preparation 3o 4the transmission electron microscope picture of powder;
Fig. 2 is the nanometer Fe of surface modification not 3o 4the transmission electron microscope picture of powder;
Fig. 3 is the nanometer Fe of embodiment mono-preparation 3o 4the nanometer Fe of powder and not surface modification 3o 4the XRD spectra of powder, wherein " a " represents the nanometer Fe of embodiment mono-preparation 3o 4powder, " b " represents the not nanometer Fe of surface modification 3o 4powder;
Fig. 4 is the nanometer Fe of embodiment mono-preparation 3o 4the nanometer Fe of powder and not surface modification 3o 4the infrared spectrogram of powder, wherein " a " represents the nanometer Fe of embodiment mono-preparation 3o 4powder, " b " represents the not nanometer Fe of surface modification 3o 4powder;
Fig. 5 is the nanometer Fe of embodiment mono-preparation 3o 4the nanometer Fe of powder and not surface modification 3o 4the room temperature magnetzation curve figure of powder, wherein " a " represents nanometer Fe prepared by the present embodiment 3o 4powder, " b " represents the not nanometer Fe of surface modification 3o 4powder;
Fig. 6 is the nanometer Fe of embodiment mono-preparation 3o 4the dielectric scanning electron microscope (SEM) photograph of nanometer of powder and the compound preparation of polyethylene.
Embodiment
Technical solution of the present invention is not limited to following cited embodiment, also comprises the arbitrary combination between each embodiment.
Embodiment one: present embodiment a kind of can with the dielectric nanometer Fe of the compound preparation nanometer of polyethylene 3o 4the preparation method of powder, specifically prepares according to following steps:
One, take by weight 9 parts～11 parts FeSO 4, 10 parts～25 parts of FeCl 3, 1 part～3 parts of coating materialss and 25 parts～40 parts saturated ammoniacal liquor;
Two, FeSO step 1 being taken 4be dissolved in and in distilled water, obtain FeSO 4solution, FeCl 3be dissolved in and in distilled water, obtain FeCl 3solution, wherein, FeSO 4feSO in solution 4with the weight ratio of distilled water be 1:1～3, FeCl 3feCl in solution 3with the weight ratio of distilled water be 1:1～3, then by FeSO 4solution and FeCl 3solution mixes and obtains mixing solutions;
Three, under agitation condition, the mixing solutions that step 2 is obtained joins in the saturated ammoniacal liquor that step 1 takes, and is then warming up to 60 ℃～80 ℃, then the coating materials that adds step 1 to take, insulation 30min～60min, obtains the nanometer Fe that particle diameter is 15nm～20nm 3o 4precast body;
Four, nanometer Fe step 3 being obtained 3o 4precast body vacuum filtration, then cleans 2～5 times with the distilled water that temperature is 60 ℃～90 ℃, then through vacuum-drying, obtain a kind of can with the dielectric nanometer Fe of the compound preparation nanometer of polyethylene 3o 4powder.
Present embodiment is accurately controlled the nanometer Fe of preparation 3o 4the particle diameter of powder, and select suitable coating materials to modify its surface, its surface being coated with and can thering is with polyethylene the specific functional groups of excellent compatibility, this coating materials can also play and suppress nano level Fe simultaneously 3o 4powder ball is polymerized to piece, accurately controls nano level Fe 3o 4the effect in powder footpath, and then can be by by itself and the compound nanocomposite dielectric that makes of polyethylene, can be when improving hot, mechanical, fire-retardant, the resistance to environmental aging of LDPE matrix, dielectric properties to this nanocomposite dielectric, have again nano ferriferrous oxide particle paramagnetism, can give this nanocomposite dielectric anisotropic properties by externally-applied magnetic field, realize the regulation and control to its macro property.
Embodiment two: present embodiment is different from embodiment one: in step 1, coating materials is polyoxyethylene nonylphenol ether.Other is identical with embodiment one.
Embodiment three: present embodiment is different from embodiment one or two: in step 3, stirring velocity is 200r/min～500r/min.Other is identical with embodiment one or two.
Embodiment four: present embodiment is different from one of embodiment one to three: be warming up to 65 ℃～75 ℃ in step 3.Other is identical with one of embodiment one to three.
Embodiment five: present embodiment is different from one of embodiment one to four: be incubated 40min～50min in step 3.Other is identical with one of embodiment one to four.
Embodiment six: present embodiment is different from one of embodiment one to five: in step 4, the temperature of distilled water is 70 ℃～80 ℃.Other is identical with one of embodiment one to five.
Embodiment seven: present embodiment is different from one of embodiment one to six: nanometer Fe in step 4 3o 4the particle diameter of powder is 8nm～12nm.Other is identical with one of embodiment one to six.
Embodiment eight: present embodiment utilize embodiment one preparation a kind of can with the dielectric nanometer Fe of the compound preparation nanometer of polyethylene 3o 4powder be applied as this nanometer Fe 3o 4powder is used for and the compound preparation nanometer of polyethylene dielectric medium.
Embodiment nine: what present embodiment was different from embodiment eight is this nanometer Fe 3o 4the dielectric method of the compound preparation nanometer of powder and polyethylene, specifically according to following steps, prepare:
A, nanometer Fe prepared by claim 1 3o 4powder and polyethylene premix, then add in twin screw extruder, in temperature, is blend 0.8h～1.2h under 155 ℃～165 ℃ conditions, and control screw torque is 55r/min～65r/min, and taking-up, granulation, obtain composite particles;
B, composite particles hot pressing film forming on vulcanizing press that steps A is obtained, controlling temperature is 120 ℃～140 ℃, and pressure is 9MPa～11MPa, and hot pressing time is 19min～21min, obtains polyethylene/Fe that thickness is 0.1mm～0.2mm 3o 4nano compound film, is nanometer dielectric medium.Other is identical with embodiment eight.
Adopt following examples to verify beneficial effect of the present invention:
Embodiment mono-:
The present embodiment a kind of can with the dielectric nanometer Fe of the compound preparation nanometer of polyethylene 3o 4the preparation method of powder, specifically prepares according to following steps:
One, take by weight 10 parts of FeSO 4, 20 parts of FeCl 3, 3 parts of coating materials and 30 parts of saturated ammoniacal liquor;
Two, FeSO step 1 being taken 4be dissolved in and in distilled water, obtain FeSO 4solution, FeCl 3be dissolved in and in distilled water, obtain FeCl 3solution, wherein, FeSO 4feSO in solution 4with the weight ratio of distilled water be 1:2, FeCl 3feCl in solution 3with the weight ratio of distilled water be 1:2, then by FeSO 4solution and FeCl 3solution mixes and obtains mixing solutions;
Three, under agitation condition, the mixing solutions that step 2 is obtained joins in the saturated ammoniacal liquor that step 1 takes, and is then warming up to 80 ℃, then the coating materials that adds step 1 to take, and insulation 60min, obtains the nanometer Fe that particle diameter is 20nm 3o 4precast body;
Four, nanometer Fe step 3 being obtained 3o 4precast body vacuum filtration, then cleans 3 times with the distilled water that temperature is 80 ℃, then through vacuum-drying, obtain a kind of can with the dielectric nanometer Fe of the compound preparation nanometer of polyethylene 3o 4powder.
In the present embodiment step 1, coating materials is polyoxyethylene nonylphenol ether, and in step 3, stirring velocity is 300r/min.
Above-mentioned nanometer Fe 3o 4the dielectric method of the compound preparation nanometer of powder and polyethylene, specifically according to following steps, prepare:
A, nanometer Fe prepared by claim 1 3o 4powder and polyethylene premix, then add in twin screw extruder, in temperature, is blend 1h under 160 ℃ of conditions, and control screw torque is 60r/min, and taking-up, granulation, obtain composite particles;
B, composite particles hot pressing film forming on vulcanizing press that steps A is obtained, controlling temperature is 130 ℃, and pressure is 10MPa, and hot pressing time is 20min, obtains polyethylene/Fe that thickness is 0.2mm 3o 4nano compound film, is nanometer dielectric medium.
Wherein, polyethylene/Fe 3o 4nanometer Fe in nano compound film 3o 4the content of powder is 1wt%.
Nanometer Fe prepared by the present embodiment 3o 4the transmission electron microscope picture of powder as shown in Figure 1, the nanometer Fe of surface modification not 3o 4the transmission electron microscope picture of powder as shown in Figure 2, nanometer Fe prepared by the present embodiment 3o 4the nanometer Fe of powder and not surface modification 3o 4as shown in Figure 3, wherein " a " represents nanometer Fe prepared by the present embodiment to the XRD spectra of powder 3o 4powder, " b " represents the not nanometer Fe of surface modification 3o 4powder, nanometer Fe prepared by the present embodiment 3o 4the nanometer Fe of powder and not surface modification 3o 4as shown in Figure 4, wherein " a " represents nanometer Fe prepared by the present embodiment to the infrared spectrogram of powder 3o 4powder, " b " represents the not nanometer Fe of surface modification 3o 4powder, nanometer Fe prepared by the present embodiment 3o 4the nanometer Fe of powder and not surface modification 3o 4as shown in Figure 5, wherein " a " represents nanometer Fe prepared by the present embodiment to the room temperature magnetzation curve figure of powder 3o 4powder, " b " represents the not nanometer Fe of surface modification 3o 4powder, nanometer Fe prepared by the present embodiment 3o 4the dielectric scanning electron microscope (SEM) photograph of nanometer of powder and the compound preparation of polyethylene as shown in Figure 6.
Result by transmission electron microscope picture and XRD spectra illustrates jointly, prepared nanometer Fe 3o 4powder is the nanometer Fe of inverse spinel structure 3o 4, median size is respectively 11nm and 12nm, and the size distribution homogeneity of the powder after finishing is better; FT-IR measures and shows, not the nanometer Fe of surface modification 3o 4powder only has a Fe-O characteristic peak, and this powder is really the nanometer Fe of the characteristic group that comprises coating materials used 3o 4powder, can be defined as target product; Magnetic is measured and is shown, two kinds of powder, all without remanent magnetism and coercive force, illustrate and all have superparamagnetism, and its saturation magnetization is also 57emu/g, and the surface finish nano Fe preparing with this coating materials is described 3o 4powder is not affecting nanometer Fe 3o 4the prerequisite of particle diameter and saturation magnetization is issued to carries out the good active group of finishing, introducing and LDPE consistency and accurately controls nanometer Fe it 3o 4particle diameter (about 11nm), suppress the dual purpose of its reunion.

Claims (8)

1. utilize coating materials prepare a kind of can with the dielectric nanometer Fe of the compound preparation nanometer of polyethylene 3o 4the method of powder, is characterized in that this nanometer Fe 3o 4the preparation method of powder, specifically prepares according to following steps:
One, take by weight 9 parts～11 parts FeSO 4, 10 parts～25 parts of FeCl 3, 1 part～3 parts of coating materialss and 25 parts～40 parts saturated ammoniacal liquor;
Two, FeSO step 1 being taken 4be dissolved in and in distilled water, obtain FeSO 4solution, FeCl 3be dissolved in and in distilled water, obtain FeCl 3solution, wherein, FeSO 4feSO in solution 4with the weight ratio of distilled water be 1:1～3, FeCl 3feCl in solution 3with the weight ratio of distilled water be 1:1～3, then by FeSO 4solution and FeCl 3solution mixes and obtains mixing solutions;
Three, under agitation condition, the mixing solutions that step 2 is obtained joins in the saturated ammoniacal liquor that step 1 takes, and is then warming up to 60 ℃～80 ℃, then the coating materials that adds step 1 to take, insulation 30min～60min, obtains the nanometer Fe that particle diameter is 15nm～20nm 3o 4precast body;
Four, nanometer Fe step 3 being obtained 3o 4precast body vacuum filtration, then cleans 2～5 times with the distilled water that temperature is 60 ℃～90 ℃, then through vacuum-drying, obtain utilizing coating materials prepare a kind of can with the dielectric nanometer Fe of the compound preparation nanometer of polyethylene 3o 4powder;
Wherein, in step 1, coating materials is polyoxyethylene nonylphenol ether.
According to claim 1 utilize coating materials prepare a kind of can with the dielectric nanometer Fe of the compound preparation nanometer of polyethylene 3o 4the method of powder, is characterized in that in step 3, stirring velocity is 200r/min～500r/min.
According to claim 2 utilize coating materials prepare a kind of can with the dielectric nanometer Fe of the compound preparation nanometer of polyethylene 3o 4the method of powder, is characterized in that being warming up to 65 ℃～75 ℃ in step 3.
According to claim 3 utilize coating materials prepare a kind of can with the dielectric nanometer Fe of the compound preparation nanometer of polyethylene 3o 4the method of powder, is characterized in that being incubated in step 3 40min～50min.
According to claim 4 utilize coating materials prepare a kind of can with the dielectric nanometer Fe of the compound preparation nanometer of polyethylene 3o 4the method of powder, the temperature that it is characterized in that distilled water in step 4 is 70 ℃～80 ℃.
According to claim 4 utilize coating materials prepare a kind of can with the dielectric nanometer Fe of the compound preparation nanometer of polyethylene 3o 4the method of powder, is characterized in that nanometer Fe in step 4 3o 4the particle diameter of powder is 8nm～12nm.
As claimed in claim 1 utilize coating materials prepare a kind of can with the dielectric nanometer Fe of the compound preparation nanometer of polyethylene 3o 4the prepared nanometer Fe of method of powder 3o 4the application of powder, is characterized in that this nanometer Fe 3o 4powder is used for and the compound preparation nanometer of polyethylene dielectric medium.
According to claim 7 utilize coating materials prepare a kind of can with the dielectric nanometer Fe of the compound preparation nanometer of polyethylene 3o 4the prepared nanometer Fe of method of powder 3o 4the application of powder, is characterized in that this nanometer Fe 3o 4the dielectric method of the compound preparation nanometer of powder and polyethylene, specifically according to following steps, prepare:
A, nanometer Fe prepared by claim 1 3o 4powder and polyethylene premix, then add in twin screw extruder, in temperature, is blend 0.8h～1.2h under 155 ℃～165 ℃ conditions, and control screw torque is 55r/min～65r/min, and taking-up, granulation, obtain composite particles;
B, composite particles hot pressing film forming on vulcanizing press that steps A is obtained, controlling temperature is 120 ℃～140 ℃, and pressure is 9MPa～11MPa, and hot pressing time is 19min～21min, obtains polyethylene/Fe that thickness is 0.1mm～0.2mm 3o 4nano compound film, is nanometer thin dielectric film.
CN201310058669.1A 2013-02-25 2013-02-25 Preparation method of nano Fe3O4 powder for preparation of nano dielectric medium through compounding with polyethylene Expired - Fee Related CN103112904B (en)

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