CN113817268A - Polypropylene capacitor film and preparation method thereof - Google Patents
Polypropylene capacitor film and preparation method thereof Download PDFInfo
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- CN113817268A CN113817268A CN202111174203.9A CN202111174203A CN113817268A CN 113817268 A CN113817268 A CN 113817268A CN 202111174203 A CN202111174203 A CN 202111174203A CN 113817268 A CN113817268 A CN 113817268A
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- -1 Polypropylene Polymers 0.000 title claims abstract description 79
- 239000004743 Polypropylene Substances 0.000 title claims abstract description 79
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 79
- 239000003990 capacitor Substances 0.000 title claims abstract description 52
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 238000000576 coating method Methods 0.000 claims abstract description 86
- 239000011248 coating agent Substances 0.000 claims abstract description 84
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 55
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 55
- 239000000945 filler Substances 0.000 claims abstract description 38
- 239000000919 ceramic Substances 0.000 claims abstract description 31
- 239000002131 composite material Substances 0.000 claims abstract description 25
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 5
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 18
- 239000006185 dispersion Substances 0.000 claims description 13
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 229920000642 polymer Polymers 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 10
- 238000009832 plasma treatment Methods 0.000 claims description 10
- 229910002113 barium titanate Inorganic materials 0.000 claims description 9
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 claims description 9
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 8
- SXRSQZLOMIGNAQ-UHFFFAOYSA-N Glutaraldehyde Chemical compound O=CCCCC=O SXRSQZLOMIGNAQ-UHFFFAOYSA-N 0.000 claims description 7
- 238000003618 dip coating Methods 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- USDJGQLNFPZEON-UHFFFAOYSA-N [[4,6-bis(hydroxymethylamino)-1,3,5-triazin-2-yl]amino]methanol Chemical compound OCNC1=NC(NCO)=NC(NCO)=N1 USDJGQLNFPZEON-UHFFFAOYSA-N 0.000 claims description 6
- 239000002904 solvent Substances 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 4
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 4
- 229910052454 barium strontium titanate Inorganic materials 0.000 claims description 4
- 239000011247 coating layer Substances 0.000 claims description 4
- 238000004132 cross linking Methods 0.000 claims description 4
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 4
- 239000004408 titanium dioxide Substances 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 229920006378 biaxially oriented polypropylene Polymers 0.000 claims description 2
- 239000011127 biaxially oriented polypropylene Substances 0.000 claims description 2
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 2
- 239000004327 boric acid Substances 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 2
- 230000015556 catabolic process Effects 0.000 abstract description 17
- 239000000463 material Substances 0.000 abstract description 2
- 239000002861 polymer material Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 239000004814 polyurethane Substances 0.000 description 3
- 229920002635 polyurethane Polymers 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 239000004594 Masterbatch (MB) Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000012612 commercial material Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- 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
- C08J7/0427—Coating with only one layer of a composition containing a polymer binder
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- 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
- C08J7/12—Chemical modification
- C08J7/123—Treatment by wave energy or particle radiation
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D129/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Coating compositions based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Coating compositions based on derivatives of such polymers
- C09D129/02—Homopolymers or copolymers of unsaturated alcohols
- C09D129/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- 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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- 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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2429/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
- C08J2429/02—Homopolymers or copolymers of unsaturated alcohols
- C08J2429/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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Abstract
The invention relates to a polypropylene material film with a multilayer structure and a preparation method thereof, which are particularly used in capacitor films and belong to the technical field of high polymer materials. The invention provides a polypropylene capacitor film, which comprises a polypropylene film for a capacitor and a polyvinyl alcohol-based composite material coating coated on the polypropylene film; the polyvinyl alcohol-based composite material coating comprises the following raw materials in parts by weight: 3-15 parts of polyvinyl alcohol, 2-7 parts of ceramic filler, 85-95 parts of water, 0.05-0.5 part of cross-linking agent and 0.01-0.1 part of accelerator; and the amount of polyvinyl alcohol is greater than the amount of ceramic filler. The polypropylene capacitor film with the multilayer structure has the advantages that the comprehensive properties such as dielectric constant are greatly improved compared with the common polypropylene capacitor film, the breakdown strength can be kept better, and the obtained capacitor film has certain folding endurance.
Description
Technical Field
The invention relates to a polypropylene material film with a multilayer structure and a preparation method thereof, which are particularly used in capacitor films and belong to the technical field of high polymer materials.
Background
Polypropylene films are the major commercial material in the capacitor film field due to their low thickness, high breakdown strength, low dielectric loss, and the like. With the research on the capacitor film, a method for improving the energy storage density of the polypropylene capacitor film, namely improving the dielectric constant of the polypropylene film and maintaining the high breakdown strength of the polypropylene film, is researched. The polypropylene capacitor films on the market are all produced by thinning polypropylene through a biaxial stretching process.
Chinese patent 201811229579.3 provides a polypropylene/high dielectric constant composite material for capacitor and a manufacturing method thereof, wherein the composite material is composed of 90-95% of polypropylene and 5-10% of high dielectric ceramic powder by volume fraction, the dielectric constant of the composite material is increased from 2.3 to 2.7 of polypropylene at most, the breakdown strength is maintained at 500MV/m, but the method has high requirement on dispersion of nano filler addition, otherwise the breakdown strength and the film forming property of polypropylene film are affected by poor dispersion, and in addition, the cost of the two-dimensional ceramic filler used is high, the process of preparing master batch by banburying also causes the reduction of polypropylene molecular weight and the deterioration of mechanical property.
Chinese patent 202010010849.2 provides a polypropylene double-layer film for capacitor, which comprises a polypropylene base film and a single-sided polyurethane-based composite material coating, wherein the polyurethane-based composite material coating is composed of polyurethane, silver and high-dielectric ceramic, the breakdown strength of the composite material is maintained at 500MV/m, and the method has limited promotion of the dielectric constant of polypropylene, and only promotes the promotion to 2.5.
Disclosure of Invention
In view of the above-mentioned drawbacks, the present invention provides a polypropylene capacitor film having a multilayer structure, which has greatly improved overall properties such as dielectric constant as compared with conventional polypropylene capacitor films, while maintaining good breakdown strength, and the obtained capacitor film has a certain folding endurance.
The technical scheme of the invention is as follows:
the first technical problem to be solved by the invention is to provide a polypropylene capacitor film, which comprises a polypropylene film for a capacitor and a polyvinyl alcohol-based composite material coating coated on the polypropylene film; wherein the polyvinyl alcohol-based composite material coating comprises the following raw materials in proportion: 3-15 parts of polyvinyl alcohol, 2-7 parts of ceramic filler, 85-95 parts of water, 0.05-0.5 part of cross-linking agent and 0.01-0.1 part of accelerator; and the dosage of the polyvinyl alcohol is larger than that of the ceramic filler, namely, the polyvinyl alcohol is used as the matrix of the coating.
Further, the ceramic filler is selected from at least one of barium titanate, barium strontium titanate, zirconium dioxide or titanium dioxide.
Preferably, the particle size of the ceramic filler is 100 nm-1000 nm, and the smaller particle size can ensure the flatness of the coating in the coating step.
Further, the crosslinking agent is selected from: one of glutaraldehyde, formaldehyde or trimethylol melamine.
Further, the accelerator is a common component for accelerating crosslinking of polyvinyl alcohol; selected from: concentrated sulfuric acid, concentrated hydrochloric acid or boric acid.
The second technical problem to be solved by the present invention is to provide a preparation method of the polypropylene capacitor film, wherein the preparation method comprises: the polyvinyl alcohol-based composite material coating is coated on the polypropylene film by adopting the conventional coating mode in the prior art, and then the polypropylene capacitor film is prepared.
Further, the coating manner includes a dip coating, a blade coating, or a slot coating manner.
Further, the preparation method comprises the following steps:
1) plasma treated polypropylene film: cleaning the surface of a biaxially oriented polypropylene film by using a solvent, and then volatilizing to remove the solvent; then, carrying out plasma treatment to obtain a polypropylene film subjected to plasma treatment for later use; the plasma treatment method used in the invention solves the adhesion problem of the polar coating and the non-polar polypropylene film;
2) coating a coating: coating the polyvinyl alcohol-based composite material coating on one side or two sides of the polypropylene film after the plasma treatment in a manner of dip coating, blade coating or slot coating; and drying to obtain the polypropylene capacitor film.
Further, in step 1), the atmosphere of the plasma treatment is selected from one of air, oxygen, and the like, and is preferably air.
Further, in step 1), the solvent is selected from: absolute ethyl alcohol or acetone.
Further, when the film is cleaned by using absolute ethyl alcohol, the film is processed under a vacuum condition, wherein the plasma processing parameters are 100W, and the processing time is 5-10 s; when the film is cleaned by using acetone, the plasma processing parameter is 50W, and the processing time is 1-50 s.
Further, in the step 2), the solid content of the polyvinyl alcohol-based composite material coating is 5 wt% -15 wt%.
The third technical problem to be solved by the invention is to provide a high-dielectric folding-resistant polymer coating, which comprises the following raw materials in proportion: 3-15 parts of polyvinyl alcohol, 2-7 parts of ceramic filler, 85-95 parts of water, 0.05-0.5 part of cross-linking agent and 0.01-0.1 part of accelerator; and the dosage of the polyvinyl alcohol is larger than that of the ceramic filler, namely, the polyvinyl alcohol is used as the matrix of the coating.
Further, the ceramic filler is selected from at least one of barium titanate, barium strontium titanate, zirconium dioxide or titanium dioxide.
Further, the crosslinking agent is selected from: one of glutaraldehyde, formaldehyde or trimethylol melamine.
Further, the accelerator is a common component for accelerating crosslinking of polyvinyl alcohol; selected from: one of glutaraldehyde, formaldehyde or trimethylol melamine.
The fourth technical problem to be solved by the present invention is to provide a preparation method of the high dielectric folding-resistant polymer coating, wherein the preparation method comprises: the polyvinyl alcohol, the ceramic filler, the cross-linking agent, the accelerant and the water are stirred and mixed evenly.
Further, the preparation method of the high-dielectric folding-resistant polymer coating comprises the following steps:
(1) preparing a polyvinyl alcohol solution: uniformly stirring and mixing polyvinyl alcohol and water at 80-100 ℃ to prepare a polyvinyl alcohol solution;
(2) preparing a ceramic filler dispersion liquid: ultrasonically stirring and mixing the ceramic filler and water to prepare filler dispersion liquid;
(3) preparing the composite material coating: ultrasonically stirring and mixing the polyvinyl alcohol solution and the filler dispersion liquid, and adding the cross-linking agent and the accelerator after uniformly mixing; and then stirring and mixing evenly to prepare the high-dielectric folding-resistant polymer coating.
The invention has the beneficial effects that:
the polyvinyl alcohol rich in hydroxyl group and capable of interacting with the ceramic filler is selected as the matrix of the coating, so that the polyvinyl alcohol/ceramic filler composite coating has good filler dispersion and interface, the coating is flexible, and has certain breakdown strength and high dielectric constant. After the polypropylene film is coated on the surface of the polypropylene film to prepare the capacitor film, the capacitor film has folding resistance, high dielectric constant and good breakdown strength; and the thickness of the coating can be regulated and controlled by adjusting the solid content of the coating solution.
Drawings
FIG. 1 is a process flow diagram of a method for preparing a capacitor film according to the present invention.
FIG. 2 is a cross-sectional view (12000 times magnified) of a multilayer polypropylene film according to example 1 of the present invention.
FIG. 3 is a coating topography (30000 times magnified) of a multilayer polypropylene film in example 1 of the present invention.
FIG. 4 is a film curl diagram of example 3 of the present invention, showing that the polypropylene capacitor film of a multilayer structure obtained by the present invention is excellent in the bendability.
FIG. 5 is a film curl diagram of example 5 of the present invention, showing that the polypropylene capacitor film of a multilayer structure obtained by the present invention is excellent in the bendability.
Detailed Description
According to the invention, the high-dielectric folding-resistant coating prepared from polyvinyl alcohol serving as a matrix and a ceramic filler is selected and coated on a polypropylene film, so that the capacitor film with high dielectric constant and folding resistance and a certain breakdown strength is prepared. The polymer coating obtained by the invention has simple components, is cheap and is easy to obtain; the polyvinyl alcohol has rich hydroxyl groups, can interact with the high-dielectric-constant ceramic filler, and is more favorable for improving the dispersion and the interface of the filler, thereby maintaining the comprehensive performance of the coating. In addition, the polyvinyl alcohol also has excellent film forming property, and can be flatly coated on a polypropylene film; the ceramic filler polyvinyl alcohol composite material coating provides a large dielectric constant, and the dielectric constant of the polypropylene film with the multilayer structure can be effectively increased; and has better breakdown strength and folding resistance.
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention.
The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Example 1
A preparation process of a film with a multilayer structure is shown in figure 1, and the specific preparation method comprises the following steps:
1) preparing a coating solution: stirring 10g of polyvinyl alcohol (1799 type polyvinyl alcohol) and 35g of water at 95 ℃ for 4h to prepare a polyvinyl alcohol solution; stirring 5g of barium titanate and 50g of water, and ultrasonically preparing a filler dispersion liquid; stirring and ultrasonically treating a polyvinyl alcohol solution and a filler dispersion liquid for 5 hours, finally dropwise adding 0.5g of cross-linking agent glutaraldehyde and 0.1g of accelerator concentrated hydrochloric acid, and uniformly stirring, wherein the mass ratio of polyvinyl alcohol to barium titanate is 2: 1, and the content of solid components polyvinyl alcohol and barium titanate in the whole coating solution is 15 wt%;
2) performing plasma treatment on the surface of the polypropylene film: cleaning the surface of the polypropylene film by using 5ml of acetone, volatilizing the acetone at normal temperature, and treating the cleaned film for 20s by using a plasma processor under the power of 50W;
3) single-side coating: coating the single side of the polyvinyl alcohol composite material coating on a polypropylene film at the speed of 5cm/s in a blade coating mode, controlling the height of a scraper of a blade coating device to be 200 mu m, enabling the thickness of the coating to be 20% of the total thickness of the film, drying the film coated with the single side coating in a blast oven at 60 ℃ for 6h, and removing water to obtain the polypropylene composite film coated with the single side (the polypropylene film for the high dielectric capacitor).
FIGS. 2 and 3 are the film profile and coating profile of example 1, respectively, showing that the coating is evenly and firmly applied to the polypropylene-based film, and the particulate ceramic filler in the polyvinyl alcohol coating has good dispersion and interface.
Example 2
A multilayer-structured polypropylene capacitor film was distinguished from example 1 in that the height of the doctor blade apparatus was increased from 200 μm in example 1 to 300 μm in example 2, and the thickness of the single-sided coating layer was made 30% of the total thickness of the film.
Example 3
A multilayer-structured polypropylene capacitor film was distinguished from example 1 in that the blade height of the blade coating apparatus was increased from 200 μm in example 1 to 400 μm in example 2, and a single-sided coating thickness of 40% of the total film thickness was obtained.
Example 4
A multi-layer structure polypropylene capacitor film is different from the embodiment 1 in that a multi-layer structure film with double-sided coating is prepared by using a dip coating mode, the dip coating process can realize coating on the front side and the back side of the polypropylene film simultaneously, the thickness of the coating is mainly controlled by the coating speed and the solid content of the coating solution, the embodiment 4 dip-coats the coating solution on the polypropylene film at the speed of 2cm/s, the content of solid polyvinyl alcohol/barium titanate in the whole coating solution is 10 wt%, and the total thickness of the coating is 20% of the total thickness of the film.
Example 5
A polypropylene capacitor film of a multilayer structure was different from example 4 in that the coating speed of dip coating was changed from 2cm/s to 1cm/s, and the total thickness of the obtained coating layer was 30% of the total thickness of the film.
Example 6
A polypropylene capacitor film of a multilayer structure differs from example 4 in that the content of solid polyvinyl alcohol/barium titanate in the whole coating solution is changed from 10 wt% to 15 wt%, so that the total thickness of the resulting coating layer is 40% of the total thickness of the film.
Comparative example 1
Pure polypropylene capacitor films which are not coated with the polyvinyl alcohol based composite material coating of the invention.
TABLE 1 dielectric constant, breakdown strength and dielectric loss of the capacitor films obtained in examples 1 to 6 and comparative example 1
| Dielectric constant | Breakdown Strength (MV/m) | Dielectric loss | |
| Example 1 | 2.75 | 462 | 0.006 |
| Example 2 | 3.18 | 396 | 0.008 |
| Example 3 | 4.05 | 367 | 0.012 |
| Example 4 | 2.78 | 530 | 0.004 |
| Example 5 | 3.20 | 501 | 0.005 |
| Example 6 | 4.10 | 410 | 0.010 |
| Comparative example 1 | 2.31 | 588 | 0.002 |
As can be seen from Table 1 showing the comparison of the performances of examples 1 to 6 with comparative example 1, the dielectric constant of the polypropylene capacitor film having a multilayer structure obtained by the present invention can be increased from 2.31 to 4.10, which is the highest of pure polypropylene, and is higher. Comparison of the properties of examples 1-3 and examples 4-6 shows that the polypropylene capacitor films with double-sided coatings (examples 4-6) have higher breakdown strength than the films with single-sided coatings (examples 1-3). Further, the preparation method of the double-sided coating in the embodiment 5 can increase the dielectric constant of the polypropylene capacitor film to 3.20, the breakdown strength reaches 501MV/m, the dielectric constant is obviously improved compared with that of the uncoated polypropylene film, and the breakdown strength is kept close. Therefore, the capacitor film manufactured by the method has higher dielectric constant and breakdown strength. In addition, fig. 4 and 5 are film curl diagrams of example 3 and example 5, respectively, showing that the polypropylene capacitor film of the multi-layer structure of the present invention still has excellent bendability.
Claims (10)
1. A polypropylene capacitor film, wherein the capacitor film comprises a polypropylene film for a capacitor and a polyvinyl alcohol-based composite coating layer coated on the polypropylene film; wherein the polyvinyl alcohol-based composite material coating comprises the following raw materials in proportion: 3-15 parts of polyvinyl alcohol, 2-7 parts of ceramic filler, 85-95 parts of water, 0.05-0.5 part of cross-linking agent and 0.01-0.1 part of accelerator; and the amount of polyvinyl alcohol is greater than the amount of ceramic filler.
2. The polypropylene capacitor film as claimed in claim 1, wherein the ceramic filler is at least one selected from barium titanate, barium strontium titanate, zirconium dioxide and titanium dioxide; preferably, the ceramic filler has a particle size of 100nm to 1000 nm.
3. The polypropylene capacitor film as claimed in claim 1 or 2, wherein the crosslinking agent is selected from the group consisting of: one of glutaraldehyde, formaldehyde or trimethylol melamine;
further, the accelerator is a common component for accelerating crosslinking of polyvinyl alcohol; preferably: concentrated sulfuric acid, concentrated hydrochloric acid or boric acid.
4. A method for preparing the polypropylene capacitor film as claimed in any one of claims 1 to 3, wherein the method comprises the following steps: the polyvinyl alcohol-based composite material coating is coated on the polypropylene film by adopting the conventional coating mode in the prior art, and then the polypropylene capacitor film is prepared.
5. The method for preparing a polypropylene capacitor film according to claim 4, wherein the coating manner comprises a dip coating, a blade coating or a slot coating manner;
further, the preparation method comprises the following steps:
1) plasma treated polypropylene film: cleaning the surface of a biaxially oriented polypropylene film by using a solvent, and then volatilizing to remove the solvent; then, carrying out plasma treatment to obtain a polypropylene film subjected to plasma treatment for later use;
2) coating a coating: coating the polyvinyl alcohol-based composite material coating on one side or two sides of the polypropylene film after the plasma treatment in a manner of dip coating, blade coating or slot coating; and drying to obtain the polypropylene capacitor film.
6. The method for preparing a polypropylene capacitor film according to claim 5, wherein in the step 1), the atmosphere of the plasma treatment is selected from one of air, oxygen and the like;
further, in step 1), the solvent is selected from: absolute ethyl alcohol or acetone;
further, when the film is cleaned by using absolute ethyl alcohol, the film is processed under a vacuum condition, wherein the plasma processing parameters are 100W, and the processing time is 5-10 s; when the film is cleaned by using acetone, the plasma processing parameter is 50W, and the processing time is 1-50 s;
further, in the step 2), the solid content of the polyvinyl alcohol-based composite material coating is 5 wt% -15 wt%.
7. A high dielectric fold-resistant polymer coating is characterized by comprising the following raw materials in parts by weight: 3-15 parts of polyvinyl alcohol, 2-7 parts of ceramic filler, 85-95 parts of water, 0.05-0.5 part of cross-linking agent and 0.01-0.1 part of accelerator; and the amount of polyvinyl alcohol is greater than the amount of ceramic filler.
8. The high dielectric flex polymer coating of claim 7, wherein the ceramic filler is selected from at least one of barium titanate, barium strontium titanate, zirconium dioxide, or titanium dioxide;
further, the crosslinking agent is selected from: one of glutaraldehyde, formaldehyde or trimethylol melamine;
further, the accelerator is a common component for accelerating crosslinking of polyvinyl alcohol; preferably: one of glutaraldehyde, formaldehyde or trimethylol melamine.
9. The method for preparing the high-dielectric folding-resistant polymer coating of claim 7 or 8, wherein the method comprises the following steps: the polyvinyl alcohol, the ceramic filler, the cross-linking agent, the accelerant and the water are stirred and mixed evenly.
10. The method for preparing a high dielectric folding-resistant polymer coating according to claim 9, wherein the method for preparing the high dielectric folding-resistant polymer coating comprises the following steps:
(1) preparing a polyvinyl alcohol solution: uniformly stirring and mixing polyvinyl alcohol and water at 80-100 ℃ to prepare a polyvinyl alcohol solution;
(2) preparing a ceramic filler dispersion liquid: ultrasonically stirring and mixing the ceramic filler and water to prepare filler dispersion liquid;
(3) preparing the composite material coating: ultrasonically stirring and mixing the polyvinyl alcohol solution and the filler dispersion liquid, and adding the cross-linking agent and the accelerator after uniformly mixing; and then stirring and mixing evenly to prepare the high-dielectric folding-resistant polymer coating.
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| CN110698725A (en) * | 2019-10-10 | 2020-01-17 | 深圳市峰泳科技有限公司 | Inorganic filler, preparation method thereof and application thereof in dielectric material |
| CN110818925A (en) * | 2019-10-14 | 2020-02-21 | 深圳市峰泳科技有限公司 | High-voltage-resistant polymer-based dielectric material and preparation method thereof |
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| CN110698725A (en) * | 2019-10-10 | 2020-01-17 | 深圳市峰泳科技有限公司 | Inorganic filler, preparation method thereof and application thereof in dielectric material |
| CN110818925A (en) * | 2019-10-14 | 2020-02-21 | 深圳市峰泳科技有限公司 | High-voltage-resistant polymer-based dielectric material and preparation method thereof |
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