CN111978630A - Novel high-frequency dielectric high-energy storage capacitor - Google Patents
Novel high-frequency dielectric high-energy storage capacitor Download PDFInfo
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- 239000003990 capacitor Substances 0.000 title claims abstract description 50
- 238000004146 energy storage Methods 0.000 title claims abstract description 39
- 239000010445 mica Substances 0.000 claims abstract description 144
- 229910052618 mica group Inorganic materials 0.000 claims abstract description 144
- 239000000843 powder Substances 0.000 claims abstract description 85
- 239000004743 Polypropylene Substances 0.000 claims abstract description 45
- -1 polypropylene Polymers 0.000 claims abstract description 38
- 229920001155 polypropylene Polymers 0.000 claims abstract description 38
- 239000000463 material Substances 0.000 claims abstract description 37
- 238000002156 mixing Methods 0.000 claims abstract description 35
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000003063 flame retardant Substances 0.000 claims abstract description 30
- 239000002131 composite material Substances 0.000 claims abstract description 29
- 238000002360 preparation method Methods 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims description 22
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 claims description 16
- 229910045601 alloy Inorganic materials 0.000 claims description 15
- 239000000956 alloy Substances 0.000 claims description 15
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 14
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 12
- BNEMLSQAJOPTGK-UHFFFAOYSA-N zinc;dioxido(oxo)tin Chemical compound [Zn+2].[O-][Sn]([O-])=O BNEMLSQAJOPTGK-UHFFFAOYSA-N 0.000 claims description 12
- 239000008367 deionised water Substances 0.000 claims description 10
- 229910021641 deionized water Inorganic materials 0.000 claims description 10
- 239000003607 modifier Substances 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 229910052628 phlogopite Inorganic materials 0.000 claims description 8
- 238000000227 grinding Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 5
- 229910000611 Zinc aluminium Inorganic materials 0.000 claims description 5
- HXFVOUUOTHJFPX-UHFFFAOYSA-N alumane;zinc Chemical compound [AlH3].[Zn] HXFVOUUOTHJFPX-UHFFFAOYSA-N 0.000 claims description 5
- 238000003851 corona treatment Methods 0.000 claims description 5
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 5
- 229910052737 gold Inorganic materials 0.000 claims description 5
- 239000010931 gold Substances 0.000 claims description 5
- 229910052709 silver Inorganic materials 0.000 claims description 5
- 239000004332 silver Substances 0.000 claims description 5
- 238000000967 suction filtration Methods 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 5
- 239000012188 paraffin wax Substances 0.000 claims description 2
- 230000015556 catabolic process Effects 0.000 abstract description 7
- 239000003989 dielectric material Substances 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 2
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000001238 wet grinding Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
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- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/06—Coating with compositions not containing macromolecular substances
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/56—Electroplating: Baths therefor from solutions of alloys
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/56—Electroplating: Baths therefor from solutions of alloys
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- C25D3/00—Electroplating: Baths therefor
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- C25D3/64—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of silver
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/018—Dielectrics
- H01G4/06—Solid dielectrics
- H01G4/14—Organic dielectrics
- H01G4/18—Organic dielectrics of synthetic material, e.g. derivatives of cellulose
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/33—Thin- or thick-film capacitors
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- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
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Abstract
The invention provides a novel high-frequency dielectric high-energy storage capacitor, and relates to the technical field of capacitor-containing processing. The base material of the novel high-frequency medium high-energy storage capacitor mainly comprises polypropylene, mixed modified mica powder and a modified mica-based flame retardant, and the preparation method comprises the steps of preparing the wet modified mica powder, preparing the dry modified mica powder, preparing the modified mica-based flame retardant, preparing a composite polypropylene material, preparing the capacitor and the like. The invention overcomes the defects of the prior art, improves the high-frequency characteristic of the novel composite dielectric material by mixing the modified mica with the polypropylene and having the dielectric constant of 2.5-3, is suitable for high-frequency application of 500kHz and above, and keeps the higher characteristic of the polypropylene in the breakdown field strength.
Description
Technical Field
The invention relates to the technical field of capacitor processing, in particular to a novel high-frequency dielectric high-energy storage capacitor.
Background
A capacitor is a device that holds an electrical charge and is formed by two conductors in close proximity to each other with a non-conductive insulating medium sandwiched between them. Generally referred to as capacitor
Since the energy storage density of a dielectric is in direct proportion to the square of the dielectric constant and the electric field intensity, it is known that a dielectric material having both high dielectric constant and high breakdown electric field intensity characteristics has the characteristic of high energy storage density. Generally, the polypropylene material has higher breakdown field strength and is suitable for application of capacitor materials, but the polypropylene material has lower dielectric constant and affects the use of capacitors to a certain extent, so that the improvement of the dielectric constant and other various properties of the polypropylene material on the basis of keeping the breakdown field strength of the polypropylene material is a great direction of research on the capacitor materials.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a novel high-frequency dielectric high-energy storage capacitor, which is prepared by mixing modified mica with polypropylene and using a novel composite dielectric material with a dielectric constant of 2.5-3, so that the high-frequency characteristic of the high-frequency dielectric high-energy storage capacitor is improved, the high-frequency dielectric high-energy storage capacitor is suitable for high-frequency application of 500kHz and above, and the high characteristic of the polypropylene is reserved in breakdown field intensity.
In order to achieve the above purpose, the technical scheme of the invention is realized by the following technical scheme:
the novel high-frequency dielectric high-energy-storage capacitor is characterized in that a base material of the novel high-frequency dielectric high-energy-storage capacitor comprises the following substances in parts by weight: 95-100 parts of polypropylene, 5-7 parts of mixed modified mica powder and 2-3 parts of modified mica-based flame retardant; the mixed modified mica powder is a mixture of wet modified mica powder and dry modified mica powder in a mass ratio of 3: 2, and the modified mica-based flame retardant comprises the following substances in parts by weight: 10-12 parts of wet modified mica powder, 10-12 parts of dry modified mica powder and 1-1.5 parts of zinc stannate.
The preparation method of the novel high-frequency dielectric high-energy storage capacitor comprises the following steps:
(1) preparing wet modified mica powder: grinding mica by a wet method, adding a composite modifier, mixing and modifying for 120min, and drying to obtain wet modified mica powder for later use;
(2) preparing dry modified mica powder: crushing mica, mixing, adding a composite modifier, and grinding in a ball mill for 15min to obtain dry modified mica powder for later use;
(3) preparing a modified mica-based flame retardant: removing the wet modified mica powder and the dry modified mica powder according to the weight, mixing, adding deionized water at 50 ℃, uniformly stirring, performing ultrasonic dispersion, adding zinc stannate, heating, uniformly stirring, keeping the temperature, standing for 6-8h, performing suction filtration while the mixture is hot, repeatedly washing the deionized water for 2-3 times, adding an ethanol solution into filter residues, performing ultrasonic dispersion, and distilling to obtain powder, namely the modified mica-based flame retardant for later use;
(4) preparing a composite polypropylene material: weighing the wet modified mica powder, the dry modified mica powder and the modified mica-based flame retardant according to the proportion, mixing and adding the mixture into polypropylene for high-temperature mixing to obtain a composite polypropylene material for later use;
(5) preparing a capacitor: the composite polypropylene material is hot-melted and stretched into a base film of 2-15 microns, the base film is subjected to corona treatment, the surface of the base film is electrified and plated with zinc-aluminum alloy, silver-based alloy and gold-based alloy to serve as an energy storage electric layer, and then the base film is wound or laminated to obtain the parallel plate capacitor.
Preferably, the mica is a mixture of high-quality pure white mica and phlogopite in a mass ratio of 2: 3.
Preferably, the composite modifier is any one of KH550, a mixture of paraffin and KH550 and sebacic acid.
Preferably, the addition amount of the composite modifier in the step (1) is 6-8% of the mass of the mica.
Preferably, the addition amount of the composite modifier in the step (2) is 6-8% of the mass of the mica.
Preferably, the time of the first ultrasonic dispersion in the step (3) is 1h, and the time of the ultrasonic dispersion after adding ethanol is 20-40 min.
Preferably, the temperature for adding zinc stannate in the step (3) and heating and stirring is 80-85 ℃.
Preferably, the temperature for high-temperature mixing in the step (4) is 175-190 ℃, and the mixing time is 1-2 h.
The invention provides a novel high-frequency dielectric high-energy storage capacitor, which has the advantages compared with the prior art that:
(1) adding natural mica material with excellent medium and high dielectric constants and high-frequency characteristics into polypropylene material with lower dielectric constant and higher breakdown field strength to obtain novel composite dielectric material with the dielectric constant of 2.5-3, wherein the high-frequency material has relatively improved characteristics, is suitable for high-frequency application of 500kHz and above, and retains the higher characteristics of polypropylene in the breakdown field strength;
(2) according to the invention, mica mixture after wet modification and dry modification is selected to be blended with the polypropylene material, so that the elongation at break, the tensile strength, the notch impact strength and the melt index can be effectively improved to 9.9g/10min, the shrinkage rate is reduced, and the mechanical property is comprehensively improved.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the novel high-frequency dielectric high-energy-storage capacitor is characterized in that a base material of the novel high-frequency dielectric high-energy-storage capacitor comprises the following substances in parts by weight: 95 parts of polypropylene, 5 parts of mixed modified mica powder and 2 parts of modified mica-based flame retardant; the mixed modified mica powder is a mixture of wet modified mica powder and dry modified mica powder in a mass ratio of 3: 2, and the modified mica-based flame retardant comprises the following substances in parts by weight: 10 parts of wet modified mica powder, 10 parts of dry modified mica powder and 1 part of zinc stannate.
The preparation method of the novel high-frequency dielectric high-energy storage capacitor comprises the following steps:
(1) preparing wet modified mica powder: wet grinding and crushing mica mixed with high-quality pure white mica and phlogopite in a mass ratio of 2: 3, adding sebacic acid accounting for 6% of the mass of the mica, mixing and modifying for 120min, and drying to obtain wet modified mica powder for later use;
(2) preparing dry modified mica powder: crushing mica mixed with high-quality pure white mica and phlogopite in a mass ratio of 2: 3, mixing, adding sebacic acid with 6% of mica mass, and grinding in a ball mill for 15min to obtain dry modified mica powder for later use;
(3) preparing a modified mica-based flame retardant: removing the wet modified mica powder and the dry modified mica powder according to the weight, mixing, adding deionized water at 50 ℃, uniformly stirring, performing ultrasonic dispersion for 1h, adding zinc stannate, heating to 80 ℃, uniformly stirring, then keeping the temperature and standing for 6h, performing suction filtration while the mixture is hot, repeatedly washing the deionized water for 2-3 times, adding an ethanol solution into filter residues, performing ultrasonic dispersion for 20min, and distilling to obtain powder and drying at constant temperature, thus obtaining the modified mica-based flame retardant for later use;
(4) preparing a composite polypropylene material: weighing the wet modified mica powder, the dry modified mica powder and the modified mica based flame retardant according to the proportion, mixing and adding the mixture into polypropylene, and mixing the mixture at the temperature of 175 ℃ for 1h to obtain a composite polypropylene material for later use;
(5) preparing a capacitor: the composite polypropylene material is hot-melted and stretched into a base film of 2-15 microns, the base film is subjected to corona treatment, the surface of the base film is electrified and plated with zinc-aluminum alloy, silver-based alloy and gold-based alloy to serve as an energy storage electric layer, and then the base film is wound or laminated to obtain the parallel plate capacitor.
Example 2:
the novel high-frequency dielectric high-energy-storage capacitor is characterized in that a base material of the novel high-frequency dielectric high-energy-storage capacitor comprises the following substances in parts by weight: 100 parts of polypropylene, 7 parts of mixed modified mica powder and 3 parts of modified mica-based flame retardant; the mixed modified mica powder is a mixture of wet modified mica powder and dry modified mica powder in a mass ratio of 3: 2, and the modified mica-based flame retardant comprises the following substances in parts by weight: 12 parts of wet modified mica powder, 12 parts of dry modified mica powder and 1.5 parts of zinc stannate.
The preparation method of the novel high-frequency dielectric high-energy storage capacitor comprises the following steps:
(1) preparing wet modified mica powder: wet grinding and crushing mica mixed with high-quality pure white mica and phlogopite in a mass ratio of 2: 3, adding sebacic acid accounting for 8% of the mass of the mica, mixing and modifying for 120min, and drying to obtain wet modified mica powder for later use;
(2) preparing dry modified mica powder: crushing mica mixed with high-quality pure white mica and phlogopite in a mass ratio of 2: 3, mixing, adding sebacic acid accounting for 8% of the mass of the mica, and grinding in a ball mill for 15min to obtain dry modified mica powder for later use;
(3) preparing a modified mica-based flame retardant: removing the wet modified mica powder and the dry modified mica powder according to the weight, mixing, adding deionized water at 50 ℃, uniformly stirring, performing ultrasonic dispersion for 1h, adding zinc stannate, heating to 85 ℃, uniformly stirring, then keeping the temperature and standing for 8h, performing suction filtration while the mixture is hot, repeatedly washing the deionized water for 2-3 times, adding an ethanol solution into filter residues, performing ultrasonic dispersion for 40min, and distilling to obtain powder and drying at constant temperature, thus obtaining the modified mica-based flame retardant for later use;
(4) preparing a composite polypropylene material: weighing the wet modified mica powder, the dry modified mica powder and the modified mica-based flame retardant according to the proportion, mixing and adding the mixture into polypropylene, and mixing the mixture at the temperature of 190 ℃ for 2 hours at high temperature to obtain a composite polypropylene material for later use;
(5) preparing a capacitor: the composite polypropylene material is hot-melted and stretched into a base film of 2-15 microns, the base film is subjected to corona treatment, the surface of the base film is electrified and plated with zinc-aluminum alloy, silver-based alloy and gold-based alloy to serve as an energy storage electric layer, and then the base film is wound or laminated to obtain the parallel plate capacitor.
Example 3:
the novel high-frequency dielectric high-energy-storage capacitor is characterized in that a base material of the novel high-frequency dielectric high-energy-storage capacitor comprises the following substances in parts by weight: 98 parts of polypropylene, 6 parts of mixed modified mica powder and 2.5 parts of modified mica-based flame retardant; the mixed modified mica powder is a mixture of wet modified mica powder and dry modified mica powder in a mass ratio of 3: 2, and the modified mica-based flame retardant comprises the following substances in parts by weight: 11 parts of wet modified mica powder, 11 parts of dry modified mica powder and 1.25 parts of zinc stannate.
The preparation method of the novel high-frequency dielectric high-energy storage capacitor comprises the following steps:
(1) preparing wet modified mica powder: wet grinding and crushing mica mixed with high-quality pure white mica and phlogopite in a mass ratio of 2: 3, adding sebacic acid accounting for 7% of the mass of the mica, mixing and modifying for 120min, and drying to obtain wet modified mica powder for later use;
(2) preparing dry modified mica powder: crushing mica mixed with high-quality pure white mica and phlogopite in a mass ratio of 2: 3, mixing, adding sebacic acid with the mass of 7% of the mica, and grinding in a ball mill for 15min to obtain dry modified mica powder for later use;
(3) preparing a modified mica-based flame retardant: removing the wet modified mica powder and the dry modified mica powder according to the weight, mixing, adding deionized water at 50 ℃, uniformly stirring, performing ultrasonic dispersion for 1h, adding zinc stannate, heating to 83 ℃, uniformly stirring, then keeping the temperature and standing for 7h, performing suction filtration while the mixture is hot, repeatedly washing the deionized water for 2-3 times, adding an ethanol solution into filter residues, performing ultrasonic dispersion for 30min, and distilling to obtain powder and drying at constant temperature, thus obtaining the modified mica-based flame retardant for later use;
(4) preparing a composite polypropylene material: weighing the wet modified mica powder, the dry modified mica powder and the modified mica based flame retardant according to the proportion, mixing and adding the mixture into polypropylene, and mixing for 1.5 hours at 185 ℃ to obtain a composite polypropylene material for later use;
(5) preparing a capacitor: the composite polypropylene material is hot-melted and stretched into a base film of 2-15 microns, the base film is subjected to corona treatment, the surface of the base film is electrified and plated with zinc-aluminum alloy, silver-based alloy and gold-based alloy to serve as an energy storage electric layer, and then the base film is wound or laminated to obtain the parallel plate capacitor.
Example 4:
using the wet modified mica powder and the wet modified mica powder prepared in the above example 3 as raw materials, respectively detecting the change results of the wet modification and the mica properties before and after the dry modification as shown in table 1 below, and according to the proportion in example 3, mixing the single wet modified mica powder with PP (group a), mixing the single dry modified mica powder with PP (group B), mixing the wet modified mica powder with the dry modified mica powder with PP (group C), mixing the unmodified mica powder with PP to obtain a material as a control group, and calculating A, B, C, D the mechanical change and mechanical property results of each group relative to the control group as shown in table 2 below:
TABLE 1
TABLE 2
Example 5:
the performance of the modified mica-based flame retardant prepared in the above example 3 after being mixed with the PP material was tested, and the results are shown in the following table:
TABLE 3
And the material after the modified mica-based flame retardant and the PP material are mixed hangs downThe direct combustion grade is kept unchanged, the oxygen index is improved to 24.3 percent, and the total heat release amount, the heat release rate, the total smoke release amount and CO of the PP flame-retardant material2The release rates were all improved with a slight increase in initial thermal decomposition temperature, residual mass and Tmax and a decrease in Rmax.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. The novel high-frequency dielectric high-energy-storage capacitor is characterized in that a base material of the novel high-frequency dielectric high-energy-storage capacitor comprises the following substances in parts by weight: 95-100 parts of polypropylene, 5-7 parts of mixed modified mica powder and 2-3 parts of modified mica-based flame retardant; the mixed modified mica powder is a mixture of wet modified mica powder and dry modified mica powder in a mass ratio of 3: 2, and the modified mica-based flame retardant comprises the following substances in parts by weight: 10-12 parts of wet modified mica powder, 10-12 parts of dry modified mica powder and 1-1.5 parts of zinc stannate.
2. A novel high-frequency dielectric high-energy storage capacitor is characterized in that: the preparation method of the novel high-frequency dielectric high-energy storage capacitor comprises the following steps:
(1) preparing wet modified mica powder: grinding mica by a wet method, adding a composite modifier, mixing and modifying for 120min, and drying to obtain wet modified mica powder for later use;
(2) preparing dry modified mica powder: crushing mica, mixing, adding a composite modifier, and grinding in a ball mill for 15min to obtain dry modified mica powder for later use;
(3) preparing a modified mica-based flame retardant: removing the wet modified mica powder and the dry modified mica powder according to the weight, mixing, adding deionized water at 50 ℃, uniformly stirring, performing ultrasonic dispersion, adding zinc stannate, heating, uniformly stirring, keeping the temperature, standing for 6-8h, performing suction filtration while the mixture is hot, repeatedly washing the deionized water for 2-3 times, adding an ethanol solution into filter residues, performing ultrasonic dispersion, and distilling to obtain powder, namely the modified mica-based flame retardant for later use;
(4) preparing a composite polypropylene material: weighing the wet modified mica powder, the dry modified mica powder and the modified mica-based flame retardant according to the proportion, mixing and adding the mixture into polypropylene for high-temperature mixing to obtain a composite polypropylene material for later use;
(5) preparing a capacitor: the composite polypropylene material is hot-melted and stretched into a base film of 2-15 microns, the base film is subjected to corona treatment, the surface of the base film is electrified and plated with zinc-aluminum alloy, silver-based alloy and gold-based alloy to serve as an energy storage electric layer, and then the base film is wound or laminated to obtain the parallel plate capacitor.
3. The novel high-frequency dielectric high-energy storage capacitor as claimed in claim 2, wherein: the mica is a mixture of high-quality pure white mica and phlogopite in a mass ratio of 2: 3.
4. The novel high-frequency dielectric high-energy storage capacitor as claimed in claim 2, wherein: the composite modifier is any one of KH550, a mixture of paraffin and KH550 and sebacic acid.
5. The novel high-frequency dielectric high-energy storage capacitor as claimed in claim 2, wherein: the addition amount of the composite modifier in the step (1) is 6-8% of the mass of the mica.
6. The novel high-frequency dielectric high-energy storage capacitor as claimed in claim 2, wherein: the addition amount of the composite modifier in the step (2) is 6-8% of the mass of the mica.
7. The novel high-frequency dielectric high-energy storage capacitor as claimed in claim 2, wherein: the time of the first ultrasonic dispersion in the step (3) is 1h, and the time of the ultrasonic dispersion after adding the ethanol is 20-40 min.
8. The novel high-frequency dielectric high-energy storage capacitor as claimed in claim 2, wherein: adding zinc stannate in the step (3), and heating and stirring at 80-85 ℃.
9. The novel high-frequency dielectric high-energy storage capacitor as claimed in claim 2, wherein: the temperature for high-temperature mixing in the step (4) is 175-190 ℃, and the mixing time is 1-2 h.
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