WO2021196511A1 - Peinture polyimide auto-adhésive résistante à l'effet corona, fil émaillé et son procédé de préparation - Google Patents

Peinture polyimide auto-adhésive résistante à l'effet corona, fil émaillé et son procédé de préparation Download PDF

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WO2021196511A1
WO2021196511A1 PCT/CN2020/111005 CN2020111005W WO2021196511A1 WO 2021196511 A1 WO2021196511 A1 WO 2021196511A1 CN 2020111005 W CN2020111005 W CN 2020111005W WO 2021196511 A1 WO2021196511 A1 WO 2021196511A1
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bis
aminophenoxy
self
adhesive
corona
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PCT/CN2020/111005
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English (en)
Chinese (zh)
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夏宇
虞鑫海
李紫璇
周成
刘艳婷
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苏州巨峰电气绝缘系统股份有限公司
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Publication of WO2021196511A1 publication Critical patent/WO2021196511A1/fr

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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
    • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • 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
    • C09D179/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen, with or without oxygen, or carbon only, not provided for in groups C09D161/00 - C09D177/00
    • C09D179/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
    • C09D179/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
    • 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
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • 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
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/002—Priming paints
    • 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
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/18—Fireproof paints including high temperature resistant paints
    • 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
    • C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/06—Insulating conductors or cables
    • H01B13/065—Insulating conductors with lacquers or enamels
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/06—Insulating conductors or cables
    • H01B13/16—Insulating conductors or cables by passing through or dipping in a liquid bath; by spraying
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/30—Drying; Impregnating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/303—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups H01B3/38 or H01B3/302
    • H01B3/306—Polyimides or polyesterimides
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/02—Disposition of insulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/29—Protection against damage caused by extremes of temperature or by flame
    • H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2237—Oxides; Hydroxides of metals of titanium
    • C08K2003/2241—Titanium dioxide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2265—Oxides; Hydroxides of metals of iron
    • C08K2003/2272—Ferric oxide (Fe2O3)
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/20—Applications use in electrical or conductive gadgets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure

Definitions

  • the invention belongs to the field of electrical insulating materials and electromagnetic wires, and particularly relates to a self-adhesive corona-resistant polyimide paint, enameled wire and a preparation method thereof
  • Enameled wire occupies a very important position in people's daily life. From small hair dryers to deflection coils of large machines, enameled wires are inseparable. At present, the commonly used enameled wires in the market are coated and wound into coils, and then the turns of the wires are bonded together by immersion and heating. This process has some shortcomings, such as unpredictable penetration inside the coil, and often bubbles and inability to stick; after the dipping varnish penetrates into the coil, the solvent may be evaporated, which may cause more or less physical and chemical effects on the coil. Reaction, and the evaporating solvent will also pollute the environment, and may even cause a fire. Therefore, researchers at home and abroad have been continuously developing new types of enameled wire paint, and self-adhesive wire enameled paint can reduce the process and reduce environmental pollution, and has a good application prospect.
  • Self-adhesive enameled wire is a special type of enameled wire, which is composed of a basic paint film (primer) and an outer self-adhesive paint film.
  • the performance of the outer self-adhesive paint is mainly to improve the bonding strength.
  • a coil made of self-adhesive paint can be heated by baking or energized to make the outer coating bonding layer interact, and the coil is automatically formed after cooling.
  • the self-adhesive enameled wire generally adopts a composite layer structure.
  • the composite layer enameled wire is made of two layers (or three layers) of paint of different materials, compared with a single-coated enameled wire of the same material, the composite wire has the respective properties of two different materials and overcomes the The performance deficiencies caused by the same material.
  • the baseline is the main functional insulation part, which ensures the insulation performance of the self-adhesive enameled wire, and the self-adhesive layer is mainly used to meet the needs of the coil forming process. It has an adhesive effect and protects the baseline. Enhanced role.
  • self-adhesive enameled wire Compared with traditional armature windings, self-adhesive enameled wire also has good winding, formability, embedding and processability. Self-adhesive enameled wire also has a significant feature that greatly simplifies the manufacturing process of coil windings, which is omitted in many occasions. The complicated procedures such as lashing, dipping, cleaning, etc. have been saved in many aspects such as equipment, electric power and labor, which is conducive to the realization of production automation and the improvement of product quality, while also bringing significant social and economic benefits.
  • Polyvinyl butyral self-adhesive enameled wire paint (heat-resistant grade is E grade) is a kind of paint that is widely used in the market. It is generally coated on the outermost layer of insulating paint such as polyvinyl formal and polyurethane to bond The method is heating.
  • insulating paint such as polyvinyl formal and polyurethane to bond The method is heating.
  • Monsanto Company of the United States has developed a self-adhesive paint with better adhesion, that is, adding five thousandths of the mass of amine compounds to butyral.
  • Epoxy resin self-adhesive paint has good dilution, convenient wire coating process, and the heat resistance of epoxy resin enameled wire paint is higher than that of acetal resin.
  • the epoxy system enameled wire mainly includes the following composite systems: modified polyester/epoxy composite self-adhesive enameled wire, polyesterimine/epoxy composite self-adhesive enameled wire, polyesterimide/polyamideimide/epoxy composite self-adhesive enameled wire Viscous enameled wire, polyamideimide/epoxy composite enameled wire, polyimide/epoxy composite enameled wire, the main function of epoxy is to play a bonding role, and the underlying resin paint plays the key insulation performance.
  • polyester resin paint The thermal shock resistance of polyester resin paint is poor, and in a closed oil, the polyester resin quickly ages and decomposes. Therefore, it is necessary to modify the polyester to improve its heat resistance in practical applications.
  • two types of enameled wires BDZ-M and APB from Phelps Dodge in the United States.
  • Polyurethane self-adhesive enameled wire paint has two major characteristics: direct solderability and high frequency.
  • This kind of self-adhesive paint-wound coil can be self-adhesively formed by a baking method, and the paint film does not need to be removed when welding the joint, and can be directly welded, so the process flow is shortened and the production efficiency is improved.
  • the heat resistance grade of polyamide resin self-adhesive paint is as high as 180-200°C.
  • the enameled wire prepared by this kind of resin has the advantages of high abrasion resistance, smooth surface, good adhesion, and low friction coefficient. With the rapid development of high-speed automatic winding machines , The status of this type of enameled wire lacquer has become increasingly prominent.
  • self-adhesive enameled wire paint was first developed by American companies in the last century, different types of self-adhesive enameled wires have been developed around the world, mainly including: direct-welding self-adhesive enameled wires, which can withstand excellent moisture resistance, that is, thermoforming changes A type of enameled wire that is small, low in bonding temperature, and can be directly welded; flame retardant self-adhesive enameled wire, that is, an enameled wire obtained by adding some fire retardant on the original basis of self-adhesive enameled wire; self-lubricating self-adhesive Enameled wire, that is, the self-adhesive material itself has lubricity, which can realize the internal lubrication of the bonding layer; B and F self-adhesive enameled wire, that is, the heat-resistant grade of self-adhesive enameled wire reaches B (130°C) or F (155°C) Wait
  • the global electromagnetic winding wire occupies 41% of the sales in Asia, of which my country accounts for the largest proportion, about 11.7% of the global market. Therefore, as the world's largest market for winding wires, the demand for enameled wire paint consumption in my country is naturally strong. However, the quality and brand of various domestic enameled wire paint products are not yet sufficiently internationally competitive. Especially for high-end enameled wire paint brands, they are even more lackluster and lack competitive advantages. Therefore, the development of high-end enameled wire paint and enameled wire is imminent, and it is inevitable. Row. In particular, high-end variable frequency motors are developing rapidly, with a market share of more than 50%, and they are still growing.
  • the invention provides a self-adhesive corona-resistant polyimide paint, enameled wire and a preparation method thereof.
  • the preparation process of the invention is simple, environmentally friendly, and the obtained product has excellent comprehensive performance, is very suitable for the manufacture of coil windings of high-power motors and large-scale high-power transformers, and has good application prospects.
  • the present invention provides a self-adhesive corona-resistant polyimide paint
  • the self-adhesive corona-resistant polyimide paint is composed of a self-adhesive paint and a corona-resistant polyimide paint;
  • the self-adhesive paint consists of Haiyin epoxy resin with a mass ratio of 1:5 ⁇ 10:3 ⁇ 8:0.5 ⁇ 1:0.1 ⁇ 0.3, N,N,N',N'-tetraglycidyl-2,2- Bis[4-(4-aminophenoxy)phenyl]propane TGBAPP, CE793 epoxy resin, 4,4'-diaminodiphenyl sulfone, m-xylylenediamine;
  • the corona-resistant polyimide paint is composed of a polyamic acid solution with a concentration of 20% (w/w) and an inorganic nanopowder treated with a coupling agent, and a polyamic acid solution with a concentration of 20% (w/w)
  • the mass ratio of the inorganic nanopowder treated with the coupling agent is 100:3-12.
  • the coupling agent is selected from 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, glycidoxypropyltrimethoxysilane, glycidoxypropyl One or more of triethoxysilanes, more preferably, the coupling agent is selected from 3-aminopropyltrimethoxysilane.
  • the inorganic nano powder is selected from one or more of nano alumina powder, nano silica powder, nano titanium dioxide powder, nano ferric oxide powder, and nano magnesium oxide powder .
  • the second aspect of the present invention also provides a self-adhesive corona-resistant polyimide enameled wire, which is composed of a red copper wire inner core and the self-adhesive corona-resistant polyimide paint outer layer.
  • the third aspect of the present invention also provides a method for preparing the self-adhesive corona-resistant polyimide enameled wire, which includes the following steps:
  • the aromatic dibasic primary amine described in step (2) is selected from the group consisting of p-phenylenediamine, m-phenylenediamine, o-phenylenediamine, trimethyl m-phenylenediamine, o-methyl p-phenylenediamine Phenylenediamine, 4,4'-diaminodiphenylmethane, 3,3'-dimethyl-4,4'-diaminodiphenylmethane, 3,3'-dimethyl-4,4'-di Amino-5,5'-diethyldiphenylmethane, 3,3',5,5'-tetramethyl-4,4'-diaminodiphenylmethane, 3,3'-diaminodiphenylmethane, 4,4'-Diaminodiphenyl ether, 3,4'-Diaminodiphenyl ether, 3,3'-Diaminodiphenyl ether, 3,3'-Diamin
  • the aromatic dibasic anhydride in step (2) is selected from pyromellitic dianhydride, 3,3',4,4'-tetracarboxylic benzophenone dianhydride, 3,3',4 , 4'-tetracarboxydiphenyl ether dianhydride, 3,3',4,4'-tetracarboxydiphenyl sulfone dianhydride, 3,3',4,4'-tetracarboxydiphenyl dianhydride, 1,4 -Bis(3,4-dicarboxyphenoxy)phthalic anhydride, 1,3-bis(3,4-dicarboxyphenoxy)phthalic anhydride, 4,4'-bis(3,4-dicarboxyl) Phenoxy) diphenyl sulfone dianhydride, 4,4'-bis(3,4-dicarboxyphenoxy) benzophenone dianhydride, 4,4'-bis(3,4-dicarboxyphenoxy) ) Diphenyl ether
  • the strong polar aprotic organic solvent described in step (2) is selected from N,N-dimethylformamide, N,N-dimethylacetamide, N-methyl-2-pyrrolidone, N -One or more of ethyl-2-pyrrolidone and dimethyl sulfoxide.
  • the highest temperature of the high-temperature drying tunnel described in step (3) is 400°C.
  • the line speed of the power-on routing described in step (3) is controlled at 1 to 5 m/min.
  • drying tunnel described in step (4) has a maximum temperature of 150°C.
  • the linear speed is controlled to be 20-35 m/min.
  • a preparation method of self-adhesive corona-resistant polyimide paint and enameled wire is provided, the main steps include:
  • aromatic dibasic primary amines, strong polar aprotic organic solvents, and aromatic dibasic anhydrides described in step (2) are as defined above.
  • the highest temperature of the high-temperature drying tunnel in step (3) is 400° C.
  • the line speed of the power-on routing is controlled to be 1 to 5 m/min.
  • the maximum temperature of the drying tunnel described in step (4) is 150° C., and the line speed of the power-on routing is controlled to be 20-35 m/min.
  • the "room temperature” in the present invention means “20-30°C”.
  • the "20% (w/w) 20% (w/w) polyamic acid solution” refers to a polyamic acid solution with a concentration of 20% by mass percentage, that is, "w/w” means mass percentage .
  • the preparation method of the self-adhesive corona-resistant polyimide paint and enameled wire provided by the present invention has a simple operation process and is environmentally friendly.
  • the manufacturing of coil windings for high-power motors and large-scale high-power transformers has good application prospects and is easy to produce on a large scale.
  • the high temperature resistant polyimide wire enamel paint provided by the present invention is used as a primer, and after inorganic oxide is added, the corona resistance and other properties can be further improved.
  • a rare hydantoin epoxy resin self-adhesive paint was designed and prepared. The introduction of self-adhesive paint can change the traditional impregnation method of motor coil windings, which can save time, save energy, save labor, and protect the environment.
  • the hydantoin epoxy resin used in the present invention contains nitrogen elements, so it also has a certain flame retardant effect.
  • Hein epoxy resin 800g of N,N,N',N'-tetraglycidyl-2,2-bis[4-(4-aminophenoxy)phenyl]propane TGBAPP, 80g of 4,4'-Diaminodiphenyl sulfone was added to the reactor, stirred, heated to 70°C-80°C, stirred and reacted for 1 hour, 600g of CE793 epoxy resin was added, after stirring, cooled to room temperature, and 20g was added The m-xylylenediamine is mixed evenly at room temperature to obtain the self-adhesive paint, which is recorded as SA-2.
  • Hein epoxy resin 1000g of N,N,N',N'-tetraglycidyl-2,2-bis[4-(4-aminophenoxy)phenyl]propane TGBAPP, 100g of 4,4'-Diaminodiphenyl sulfone was added to the reaction kettle, stirred, heated to 70°C-80°C, stirred and reacted for 0.8 hours, then 800g of CE793 epoxy resin was added, after stirring evenly, cooled to room temperature, and 10g was added The m-xylylenediamine is added and mixed evenly at room temperature to obtain the self-adhesive paint, which is recorded as SA-3.
  • the CAP2000+ viscometer produced by Brookfield Company of the United States was used for the test.
  • the rotor was No. 1 and the temperature range was 25°C.
  • the wound spiral copper wire is immersed in the self-adhesive paint, cured at 180°C for 1 hour, and the bonding force is tested by a microcomputer-controlled electronic universal testing machine. Three samples are tested for each formula, and then the average value is taken.
  • Example 3 For the corona-resistant polyimide paint film of Example 3 (the curing process is: start from room temperature to 100°C, hold for 1 hour, continue to heat up to 200°C, hold for 1 hour, continue to heat up to 300°C for 1 hour, naturally Cooled to room temperature) Perform performance tests, including volume resistivity, dielectric loss, breakdown field strength, and corona resistance. The specific test results are shown in Table 2. The test methods are as follows:
  • the ZC-90G high insulation resistance measuring instrument produced by Shanghai Taiou Electronics Co., Ltd. was used to test the cured paint film copper sheet under the condition of 1kV, and the thickness of the sample was measured.
  • the insulating material Under the action of an external electric field, the insulating material loses its insulating properties due to a short-circuit phenomenon between the electrodes, which is called dielectric breakdown.
  • the voltage when the insulating material is broken down is called the breakdown voltage, and the breakdown field strength is the ratio of the breakdown voltage to the thickness of the dielectric.
  • the CW2672H automatic high voltage breakdown device of Changzhou Micro-Special Motor Factory was used to test the cured paint film copper sheet.
  • Corona resistance time refers to the time that an insulating material takes from corona discharge to when the material is broken down.
  • the corona-resistant life of materials is also related to factors such as frequency, temperature, and electric field strength.
  • the JGM-3F high-frequency pulse voltage tester produced by Shanghai Shenfa Testing Instrument Co., Ltd. was used to test the corona resistance of the prepared paint film. Test conditions: temperature: room temperature; pulse frequency: 20kHz; pulse duty ratio: 50%; pulse voltage peak-to-peak value: 2.5kV.
  • the JR-16A enameled round wire winding tester produced by Yuhang Technology Co., Ltd. is used to wind the enameled wire to observe whether it reaches the preset number of turns.
  • the ZDS-50B automatic voltage tester produced by Yuhang Technology Co., Ltd. is used to test the voltage of the enameled wire. After the pattern is broken down, the voltage is recorded.
  • test conditions test conditions: temperature: 155°C; pulse frequency: 20kHz; pulse duty cycle: 50 %; peak-to-peak pulse voltage: 3.0kV.
  • the enameled wire is tested with the ZDG-25 intelligent one-way paint scraping tester produced by Yuhang Technology Co., Ltd., the enameled wire is placed according to the steps, and then a certain load is set for the scraping force test.
  • the enameled wire is placed in the enameled wire according to the steps with the JLD-10 type jerky breaking tester produced by Xinxiong Instrument Co., Ltd., and the jerky pull test is performed when the barometer reaches 0.7-0.8MPa.

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  • Organic Insulating Materials (AREA)
  • Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)

Abstract

L'invention concerne une peinture polyimide auto-adhésive résistante à l'effet corona, un fil émaillé et son procédé de préparation. La peinture polyimide auto-adhésive résistante à l'effet corona est composée d'une peinture auto-adhésive et d'une peinture polyimide résistante à l'effet corona. Le fil émaillé est composé d'un noyau interne de fil de cuivre rouge et d'une couche externe de peinture polyimide auto-adhésive résistante à l'effet corona. Le procédé de préparation de la peinture polyimide auto-adhésive résistante à l'effet corona et du fil émaillé est simple à mettre en œuvre et respectueux de l'environnement, et le produit obtenu est approprié pour la fabrication d'enroulements de bobine de moteurs électriques de haute puissance et de transformateurs de grande puissance à grande échelle.
PCT/CN2020/111005 2020-03-31 2020-08-25 Peinture polyimide auto-adhésive résistante à l'effet corona, fil émaillé et son procédé de préparation WO2021196511A1 (fr)

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