WO2024120545A1 - Corona-resistant composite sheet for electric motor of new energy vehicle, and preparation method therefor - Google Patents

Corona-resistant composite sheet for electric motor of new energy vehicle, and preparation method therefor Download PDF

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Publication number
WO2024120545A1
WO2024120545A1 PCT/CN2024/070842 CN2024070842W WO2024120545A1 WO 2024120545 A1 WO2024120545 A1 WO 2024120545A1 CN 2024070842 W CN2024070842 W CN 2024070842W WO 2024120545 A1 WO2024120545 A1 WO 2024120545A1
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hot
film layer
melt film
composite sheet
corona
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PCT/CN2024/070842
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French (fr)
Chinese (zh)
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郑广会
王文
张铃
赵培振
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天蔚蓝电驱动科技(江苏)有限公司
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Publication of WO2024120545A1 publication Critical patent/WO2024120545A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B19/00—Layered products comprising a layer of natural mineral fibres or particles, e.g. asbestos, mica
    • B32B19/04—Layered products comprising a layer of natural mineral fibres or particles, e.g. asbestos, mica next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

Definitions

  • the present application relates to the technical field of corona-resistant composite materials for new energy motors, and in particular to a corona-resistant composite sheet for new energy vehicle motors and a preparation method thereof.
  • the existing slot insulation and interphase insulation papers with high temperature resistance of H grade or above for new energy automobile motors are mostly pure aramid fiber paper, or aramid fiber paper and polyimide film composited with high temperature resistant adhesives.
  • the typical composite paper structure is Nomex fiber paper/PI film/Nomex fiber paper (NHN), and the composite adhesives are mostly epoxy, polyurethane, or polyacrylate adhesives.
  • Aramid fiber pure paper or NHN composite paper has high heat resistance, and its performance in the insulation structure of 400V voltage platform motors of new energy vehicles is very excellent.
  • a corona-resistant composite sheet for new energy vehicle motors and a preparation method thereof are provided.
  • the mica paper layer is reinforced with a hot-melt film so that the finally obtained corona-resistant composite sheet has high density, excellent corona resistance, electrical strength, heat resistance, mechanical properties, high partial discharge starting voltage and good application process performance.
  • a corona-resistant composite sheet for new energy vehicle motors is provided, which is prepared by raw materials in the following weight percentages: a first hot-melt film layer of 10-40%, a mica paper layer of 20-80% and a second hot-melt film layer of 10-40%.
  • no adhesive is used between the first hot-melt film layer, the mica paper layer and the second hot-melt film layer.
  • the thickness ratio of the first hot-melt film layer, the mica paper layer and the second hot-melt film layer is 1:2:1.
  • the first hot-melt film layer is selected from one or more of polyphenylene sulfide, polyvinylidene fluoride, tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer, fluorinated ethylene propylene copolymer, ethylene-tetrafluoroethylene copolymer, polyetheretherketone and polyetherimide.
  • the second hot-melt film layer is selected from one or more of polyphenylene sulfide, polyvinylidene fluoride, tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer, fluorinated ethylene propylene copolymer, ethylene-tetrafluoroethylene copolymer, polyetheretherketone and polyetherimide.
  • the materials of the first hot-melt film layer and the second hot-melt film layer may not be completely the same. Both are thermoplastic plastics that are resistant to high temperatures above 180°C and oil-resistant, so that the composite sheet is oil-resistant and can adapt to complex environments such as oil in equipment, and has strong adaptability.
  • the first hot-melt film layer and the second hot-melt film layer are thermoplastic plastics resistant to high temperatures above 180° C. and oil, and have a dielectric constant of less than 4.
  • the partial discharge inception voltage (PDIV) can be increased by selecting plastics with a smaller dielectric constant.
  • the first hot-melt film layer and/or the second hot-melt film layer further includes inorganic nanoparticles.
  • the inorganic nanoparticles are one or more of silicon dioxide, aluminum oxide, boron nitride, aluminum nitride and titanium dioxide, and the particle size of the inorganic nanoparticles is 10 nm-800 nm.
  • the mica paper layer includes mica flakes and reinforcing materials, and the mica flakes have a particle size of 30 meshes to 800 meshes.
  • the reinforcing material includes one or both of aramid fiber and glass fiber.
  • Glass fiber or aramid fiber is added to improve the mechanical properties and application processability of the material.
  • the glass fiber is chopped glass fiber
  • the aramid fiber is precipitated meta-aramid fiber
  • the added amount of the glass fiber and/or aramid fiber is 5-30% of the weight of the mica paper layer.
  • the mica paper layer is reinforced with a hot-melt film, so that the final corona-resistant composite sheet has high density, excellent corona resistance, electrical strength, heat resistance, mechanical properties, high partial discharge starting voltage and good application process performance.
  • the corona-resistant composite sheet for new energy vehicle motors of the present application by using a hot-melt film layer that is resistant to high temperature, oil and has a small dielectric constant, and then using inorganic nanoparticles for reinforcement and modification, and hot pressing with a mica paper layer, the mica flakes in the mica paper layer have better corona resistance than mica in other states.
  • the dual corona resistance of the mica flake structure and nanoparticles can significantly improve the corona resistance life of the composite material, thereby enabling the composite sheet to have excellent corona resistance and higher PDIV.
  • glass fiber and aramid fiber are used to form a mica paper layer with mica flakes, and the precipitated aramid fiber is in a light film form.
  • Aramid fibers adhere to rod-shaped chopped fibers to help form a fiber scaffold, which can transfer stress when subjected to external force.
  • the network structure interwoven between fibers and other materials makes the composite sheet high in density, excellent in corona resistance and long in service life.
  • FIG1 is a schematic diagram of the material composition of a corona-resistant composite sheet for a new energy vehicle motor according to an embodiment of the present application
  • FIG2 is a schematic cross-sectional view of a corona-resistant composite sheet for use in new energy vehicle motors according to an embodiment of the present application.
  • the first hot-melt film layer, the second hot-melt film layer and the mica paper layer are all prepared by conventional hot pressing or other processes such as papermaking.
  • Composite sheet 1# is made of the following raw materials in weight percentage: 10% first hot-melt film layer, 80% mica paper layer and 10% second hot-melt film layer; the first hot-melt film layer, mica paper layer and second hot-melt film layer are completely fused in the thickness direction.
  • the thickness of the first hot-melt film layer is 0.02 mm, the thickness of the mica paper layer is 0.20 mm, and the thickness of the second hot-melt film layer is 0.02 mm.
  • the first hot-melt film layer and the second hot-melt film layer are both tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymers, and the dielectric constant is 2.03.
  • the first hot-melt film layer and the second hot-melt film layer also include inorganic nanoparticles, the inorganic nanoparticles are boron nitride, the particle size is 20 nm, and the addition amount is 5% of the weight of the first hot-melt film layer.
  • the mica paper layer includes mica flakes, and the particle size of the mica flakes is 30 meshes.
  • the mica paper layer also includes precipitated meta-aramid fibers, and the addition amount is 5% of the weight of the mica paper layer.
  • the preparation method of composite sheet 1# comprises the following steps:
  • the stacked multilayer materials are hot-pressed by hot rollers at a temperature of 380°C and a pressure of 20 MPa;
  • Composite sheet 2# is made of the following raw materials in weight percentage: 30% first hot-melt film layer, 40% mica paper layer and 30% second hot-melt film layer; the first hot-melt film layer, mica paper layer and second hot-melt film layer are completely fused in the thickness direction.
  • the thickness of the first hot-melt film layer is 0.08 mm
  • the thickness of the mica paper layer is 0.10 mm
  • the thickness of the second hot-melt film layer is 0.08 mm.
  • Both the first hot-melt film layer and the second hot-melt film layer are made of polyether Ether ketone, the dielectric constant is 3.2.
  • the first hot melt film layer and the second hot melt film layer also include inorganic nanoparticles, the inorganic nanoparticles are aluminum oxide, the particle size is 400nm, and the addition amount is 10% of the weight of the first hot melt film layer.
  • the mica paper layer includes mica flakes, and the particle size of the mica flakes is 400 mesh.
  • the mica paper layer also includes chopped glass fibers, and the addition amount is 15% of the weight of the mica paper layer.
  • the preparation method of composite sheet 2# comprises the following steps:
  • the stacked multilayer materials are hot-pressed by hot rollers at a temperature of 390°C and a pressure of 15 MPa;
  • Composite sheet 3# is made of the following raw materials in weight percentage: 20% first hot-melt film layer, 60% mica paper layer and 20% second hot-melt film layer; the first hot-melt film layer, mica paper layer and second hot-melt film layer are completely fused in the thickness direction.
  • the thickness of the first hot-melt film layer is 0.10 mm
  • the thickness of the mica paper layer is 0.20 mm
  • the thickness of the second hot-melt film layer is 0.10 mm.
  • the first hot-melt film layer and the second hot-melt film layer are both polyphenylene sulfide, and the dielectric constant is 3.1.
  • the first hot-melt film layer and the second hot-melt film layer also include inorganic nanoparticles, the inorganic nanoparticles are titanium dioxide, the particle size is 800 nm, and the addition amount is 10% of the weight of the first hot-melt film layer.
  • the mica paper layer includes mica flakes, and the particle size of the mica flakes is 800 mesh.
  • the mica paper layer also includes precipitated meta-aramid fibers, and the addition amount is 20% of the weight of the mica paper layer.
  • the preparation method of composite sheet 3# comprises the following steps:
  • the stacked multilayer materials are hot-pressed by hot rollers at a temperature of 300°C and a pressure of 15 MPa;
  • Composite sheet 4# is made of the following raw materials in weight percentage: 20% first hot-melt film layer, 60% mica paper layer and 20% second hot-melt film layer; the first hot-melt film layer, mica paper layer and second hot-melt film layer are completely fused in the thickness direction.
  • the thickness of the first hot-melt film layer is 0.10 mm
  • the thickness of the mica paper layer is 0.20 mm
  • the thickness of the second hot-melt film layer is 0.10 mm.
  • the first hot-melt film layer and the second hot-melt film layer are both polyphenylene sulfide with a dielectric constant of 3.1.
  • the mica paper layer includes mica flakes with a particle size of 600 mesh.
  • the preparation method of composite sheet 4# comprises the following steps:
  • the stacked multilayer materials are hot-pressed by hot rollers at a temperature of 295° C. and a pressure of 10 MPa;
  • the difference between the comparative composite sheet 1# and the composite sheet 3# is that the comparative composite sheet 1# has no second hot-melt film layer, but only the first hot-melt film layer, the first hot-melt film layer is 20%, and the mica paper layer is 80%.
  • the preparation method is the same as that of Example 3.
  • the difference between the composite sheet 2# and the composite sheet 3# is that the first hot-melt film layer is 5%, the mica paper layer is 90% and the second hot-melt film layer is 5%.
  • the preparation method is the same as that of Example 3.
  • the difference between the comparative composite sheet 3# and the composite sheet 3# is that the plastic used in the first hot-melt film layer and the second hot-melt film layer of the comparative composite sheet 3# is polyphthalamide, and the dielectric constant is 4.3, and the rest is the same.
  • the difference between the composite sheet 4# and the composite sheet 3# is that the hot pressing temperature in step (2) of the preparation method is 200°C and the pressure is 5 MPa.
  • PDIV Partial Discharge Initiation Voltage
  • Figure 1 is a schematic diagram of the material composition of the corona-resistant composite sheet for new energy vehicle motors prepared in Examples 1-4 of the present application
  • Figure 2 is a schematic diagram of the cross-section of the corona-resistant composite sheet for new energy vehicle motors prepared in Examples 1-4 of the present application.
  • the composite sheets 1#-4# prepared by the raw materials and methods specified in this application have higher PDIV, long square wave corona resistance life, excellent high temperature resistance and excellent mechanical properties.
  • the comparison composite material 1# uses a single layer of hot-melt film, and the final result has average electrical performance and average high temperature resistance.
  • the comparison composite material 2# uses the first and second hot-melt film layers in a proportion lower than the limit of this application. Within a certain range, the final result is that the electrical performance is average and the high temperature resistance performance is average.
  • composite material 3# used a plastic with a larger dielectric constant, and the final result was average electrical performance and low PDIV;
  • composite material 4# used a temperature lower than the specified range of this application, and the final fusion effect between the first and second hot-melt film layers and the mica paper layer was poor, resulting in partial interface fusion, resulting in average electrical performance, short square wave corona resistance life, and average mechanical properties.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Insulating Bodies (AREA)
  • Laminated Bodies (AREA)

Abstract

A corona-resistant composite sheet for an electric motor of a new energy vehicle, and a preparation method therefor. The composite sheet is prepared from the following raw materials in percentages by weight: 10-40% of a first hot melt film layer (1), 20-80% of a mica paper layer (2), and 10-40% of a second hot melt film layer (3). The mica paper layer (2) is reinforced by using hot melt films, such that a finally obtained corona-resistant composite sheet has a high compactness, a good corona resistance, electrical strength, heat resistance and mechanical performance, a high partial discharge inception voltage, and a good application process performance.

Description

一种用于新能源汽车电机的耐电晕复合片材及其制备方法A corona-resistant composite sheet for new energy vehicle motor and preparation method thereof
本申请要求2023年01月10日提交中国专利局、申请号为202310032730.9、发明名称为“一种用于新能源汽车电机的耐电晕复合片材及其制备方法”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。This application claims the priority of the Chinese patent application filed with the China Patent Office on January 10, 2023, with application number 202310032730.9 and invention name “A corona-resistant composite sheet for new energy vehicle motors and its preparation method”, the entire contents of which are incorporated by reference in this application.
技术领域Technical Field
本申请涉及新能源电机用耐电晕复合材料技术领域，尤其涉及一种用于新能源汽车电机的耐电晕复合片材及其制备方法。The present application relates to the technical field of corona-resistant composite materials for new energy motors, and in particular to a corona-resistant composite sheet for new energy vehicle motors and a preparation method thereof.
背景技术Background technique
现有新能源汽车电机用耐高温H级以上槽绝缘和相间绝缘纸多为芳纶纤维纯纸，或芳纶纤维纸与聚酰亚胺薄膜并使用耐高温胶粘剂复合而成，典型的复合纸结构为Nomex纤维纸/PI薄膜/Nomex纤维纸(NHN)，复合胶粘剂多采用环氧、聚氨酯、或聚丙烯酸酯类胶粘剂。芳纶纤维纯纸或NHN复合纸具有较高的耐热性，用于新能源汽车400V电压平台电机绝缘结构的性能是非常优异的，然而对于800V电压平台电机，因为电压等级较高，加之脉宽调制尖峰电压，以及环境因素的影响，其最高安全电压可能会达到2300V甚至更高，这已经远远超过了现有常规低压电机用绝缘材料的局部放电起始电压(PDIV)，在电机运行过程中产生局部放电的概率是非常高的，因此对于800V电压平台汽车电机就必须要考虑绝缘材料的耐电晕性能。The existing slot insulation and interphase insulation papers with high temperature resistance of H grade or above for new energy automobile motors are mostly pure aramid fiber paper, or aramid fiber paper and polyimide film composited with high temperature resistant adhesives. The typical composite paper structure is Nomex fiber paper/PI film/Nomex fiber paper (NHN), and the composite adhesives are mostly epoxy, polyurethane, or polyacrylate adhesives. Aramid fiber pure paper or NHN composite paper has high heat resistance, and its performance in the insulation structure of 400V voltage platform motors of new energy vehicles is very excellent. However, for 800V voltage platform motors, due to the high voltage level, pulse width modulation spike voltage, and the influence of environmental factors, its maximum safety voltage may reach 2300V or even higher, which is far higher than the partial discharge inception voltage (PDIV) of existing conventional low-voltage motor insulation materials. The probability of partial discharge during motor operation is very high. Therefore, for 800V voltage platform automobile motors, the corona resistance of the insulation material must be considered.
现有技术是通过在有机芳纶纤维纸中添加云母成分，或者使用环氧、聚氨酯或聚丙烯酸酯类胶粘剂复合芳纶纤维纸和云母纸等方式，来提升复合纸的耐电晕寿命。然而通过这两种方式制备的含云母复合纸都存在易掉粉、易分层、易碎裂等问题，耐电晕性能和耐高温性一般，局部放电起始电压(PDIV)较低，无法满足新能源汽车电机大批量应用的工艺要求。 The existing technology is to increase the corona resistance life of the composite paper by adding mica components to organic aramid fiber paper, or by using epoxy, polyurethane or polyacrylate adhesives to composite aramid fiber paper and mica paper. However, the mica-containing composite paper prepared by these two methods has problems such as easy powder loss, easy delamination, and easy breakage. The corona resistance and high temperature resistance are average, and the partial discharge inception voltage (PDIV) is low, which cannot meet the process requirements for large-scale application of new energy vehicle motors.
发明内容Summary of the invention
为了解决上述问题，提供了一种用于新能源汽车电机的耐电晕复合片材及其制备方法，使用热熔膜对云母纸层进行补强，使得最终获得的耐电晕复合片材致密性高，具有优异的耐电晕性能、电气强度、耐热性能、机械性能、高的局部放电起始电压和好的应用工艺性能。In order to solve the above problems, a corona-resistant composite sheet for new energy vehicle motors and a preparation method thereof are provided. The mica paper layer is reinforced with a hot-melt film so that the finally obtained corona-resistant composite sheet has high density, excellent corona resistance, electrical strength, heat resistance, mechanical properties, high partial discharge starting voltage and good application process performance.
根据本申请的一个方面，提供了一种用于新能源汽车电机的耐电晕复合片材，包括以下重量百分比的原料制备而成：第一热熔膜层10-40％、云母纸层20-80％和第二热熔膜层10-40％。According to one aspect of the present application, a corona-resistant composite sheet for new energy vehicle motors is provided, which is prepared by raw materials in the following weight percentages: a first hot-melt film layer of 10-40%, a mica paper layer of 20-80% and a second hot-melt film layer of 10-40%.
可选地，所述第一热熔膜层、所述云母纸层和所述第二热熔膜层之间不使用胶黏剂。Optionally, no adhesive is used between the first hot-melt film layer, the mica paper layer and the second hot-melt film layer.
可选地，所述第一热熔膜层的厚度为0.02-0.15mm，所述云母纸层的厚度为0.05-0.20mm，所述第二热熔膜层的厚度为0.02-0.15mm。Optionally, the thickness of the first hot-melt film layer is 0.02-0.15 mm, the thickness of the mica paper layer is 0.05-0.20 mm, and the thickness of the second hot-melt film layer is 0.02-0.15 mm.
可选地，所述第一热熔膜层、所述云母纸层和所述第二热熔膜层的厚度比例为1:2:1。Optionally, the thickness ratio of the first hot-melt film layer, the mica paper layer and the second hot-melt film layer is 1:2:1.
可选地，所述第一热熔膜层选自聚苯硫醚、聚偏二氟乙烯、四氟乙烯-全氟烷氧基乙烯基醚共聚物、氟化乙烯丙烯共聚物、乙烯-四氟乙烯共聚物、聚醚醚酮和聚醚酰亚胺中的一种或多种。Optionally, the first hot-melt film layer is selected from one or more of polyphenylene sulfide, polyvinylidene fluoride, tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer, fluorinated ethylene propylene copolymer, ethylene-tetrafluoroethylene copolymer, polyetheretherketone and polyetherimide.
可选地，所述第二热熔膜层选自聚苯硫醚、聚偏二氟乙烯、四氟乙烯-全氟烷氧基乙烯基醚共聚物、氟化乙烯丙烯共聚物、乙烯-四氟乙烯共聚物、聚醚醚酮和聚醚酰亚胺中的一种或多种。Optionally, the second hot-melt film layer is selected from one or more of polyphenylene sulfide, polyvinylidene fluoride, tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer, fluorinated ethylene propylene copolymer, ethylene-tetrafluoroethylene copolymer, polyetheretherketone and polyetherimide.
第一热熔膜层和第二热熔膜层的材料可以不完全相同，选用的均为耐高温180℃以上、且耐油的热塑性塑料，使复合片材具有耐油性，从而能适应设备内有油等复杂环境，适应性强。The materials of the first hot-melt film layer and the second hot-melt film layer may not be completely the same. Both are thermoplastic plastics that are resistant to high temperatures above 180°C and oil-resistant, so that the composite sheet is oil-resistant and can adapt to complex environments such as oil in equipment, and has strong adaptability.
可选地，第一热熔膜层和第二热熔膜层为耐高温180℃以上、且耐油的热塑性塑料，介电常数小于4。通过选择介电常数较小的塑料能提高局部放电起始电压(PDIV)。Optionally, the first hot-melt film layer and the second hot-melt film layer are thermoplastic plastics resistant to high temperatures above 180° C. and oil, and have a dielectric constant of less than 4. The partial discharge inception voltage (PDIV) can be increased by selecting plastics with a smaller dielectric constant.
可选地，所述第一热熔膜层和/或所述第二热熔膜层还包括无机纳米颗粒。Optionally, the first hot-melt film layer and/or the second hot-melt film layer further includes inorganic nanoparticles.
可选地，所述无机纳米颗粒为二氧化硅、三氧化二铝、氮化硼、氮化铝和二氧化钛中的一种或几种，所述无机纳米颗粒的粒径为10nm-800nm。 Optionally, the inorganic nanoparticles are one or more of silicon dioxide, aluminum oxide, boron nitride, aluminum nitride and titanium dioxide, and the particle size of the inorganic nanoparticles is 10 nm-800 nm.
通过添加无机纳米颗粒并限定粒径，提高材料的耐电晕性能，无机纳米颗粒的分散均匀性好。By adding inorganic nanoparticles and limiting the particle size, the corona resistance of the material is improved, and the dispersion uniformity of the inorganic nanoparticles is good.
可选地，无机纳米颗粒的添加量为第一热熔膜层或第二热熔膜层重量的2.5％-15％。Optionally, the added amount of the inorganic nanoparticles is 2.5%-15% of the weight of the first hot-melt film layer or the second hot-melt film layer.
可选地，所述云母纸层包括云母鳞片和补强材料，所述云母鳞片粒径为30目-800目。Optionally, the mica paper layer includes mica flakes and reinforcing materials, and the mica flakes have a particle size of 30 meshes to 800 meshes.
可选地，所述补强材料包括芳纶纤维、玻璃纤维中的一种或两种。加入玻璃纤维或芳纶纤维以提高材料的机械性能和应用工艺性。Optionally, the reinforcing material includes one or both of aramid fiber and glass fiber. Glass fiber or aramid fiber is added to improve the mechanical properties and application processability of the material.
可选地，玻璃纤维为短切玻璃纤维，芳纶纤维为沉析间位芳纶纤维，玻璃纤维和/或芳纶纤维的添加量为云母纸层重量的5-30％。Optionally, the glass fiber is chopped glass fiber, the aramid fiber is precipitated meta-aramid fiber, and the added amount of the glass fiber and/or aramid fiber is 5-30% of the weight of the mica paper layer.
根据本申请的另一方面，还提供了一种如任一上述的用于新能源汽车电机的耐电晕复合片材的制备方法，包括以下步骤：According to another aspect of the present application, there is also provided a method for preparing a corona-resistant composite sheet for a new energy vehicle motor as described above, comprising the following steps:
(1)将第一热熔膜层、云母纸层和第二热熔膜层放卷并依次叠放在一起，层与层之间不需要涂覆胶黏剂；(1) unwinding the first hot-melt film layer, the mica paper layer, and the second hot-melt film layer and stacking them together in sequence, without coating adhesive between the layers;
(2)将叠放好的多层材料经热辊热压，热压温度为290-390℃，压力为5-20MPa；(2) hot pressing the stacked multilayer materials with hot rollers at a temperature of 290-390° C. and a pressure of 5-20 MPa;
(3)热压完成后即得所述用于新能源汽车电机的耐电晕复合片材。(3) After the hot pressing is completed, the corona-resistant composite sheet for new energy vehicle motors is obtained.
本申请的有益效果包括但不限于：The beneficial effects of this application include but are not limited to:
1.根据本申请的用于新能源汽车电机的耐电晕复合片材，使用热熔膜对云母纸层进行补强，使得最终获得的耐电晕复合片材致密性高，具有优异的耐电晕性能、电气强度、耐热性能、机械性能、高的局部放电起始电压和好的应用工艺性能。1. According to the corona-resistant composite sheet for new energy vehicle motors of the present application, the mica paper layer is reinforced with a hot-melt film, so that the final corona-resistant composite sheet has high density, excellent corona resistance, electrical strength, heat resistance, mechanical properties, high partial discharge starting voltage and good application process performance.
2.根据本申请的用于新能源汽车电机的耐电晕复合片材，通过使用耐高温、耐油和介电常数小的热熔膜层，再使用无机纳米颗粒进行增强改性，与云母纸层热压，云母纸层中云母鳞片相比于其他状态的云母具有更好的耐电晕性能，云母鳞片结构和纳米颗粒的双重耐电晕特性，可显著提高复合材料的耐电晕寿命，从而使复合片材具备优异的耐电晕性能和较高的PDIV。2. According to the corona-resistant composite sheet for new energy vehicle motors of the present application, by using a hot-melt film layer that is resistant to high temperature, oil and has a small dielectric constant, and then using inorganic nanoparticles for reinforcement and modification, and hot pressing with a mica paper layer, the mica flakes in the mica paper layer have better corona resistance than mica in other states. The dual corona resistance of the mica flake structure and nanoparticles can significantly improve the corona resistance life of the composite material, thereby enabling the composite sheet to have excellent corona resistance and higher PDIV.
3.根据本申请的用于新能源汽车电机的耐电晕复合片材，通过使用玻璃纤维和芳纶纤维与云母鳞片组成云母纸层，沉析芳纶纤维是轻薄膜状， 芳纶纤维会与棒状短切纤维粘附在一起，有助于形成纤维支架，在受到外力时，可起到传递应力的作用，纤维与其他材料交织成的网络结构使复合片材致密度高，耐电晕性能优异，使用寿命长。3. According to the corona-resistant composite sheet for new energy vehicle motors of the present application, glass fiber and aramid fiber are used to form a mica paper layer with mica flakes, and the precipitated aramid fiber is in a light film form. Aramid fibers adhere to rod-shaped chopped fibers to help form a fiber scaffold, which can transfer stress when subjected to external force. The network structure interwoven between fibers and other materials makes the composite sheet high in density, excellent in corona resistance and long in service life.
4.根据本申请的用于新能源汽车电机的耐电晕复合片材，使用耐高温塑料作为热熔膜层融合云母鳞片，不使用任何其它胶粘剂，可以减少胶粘剂对复合片材机械性能、电气性能、耐热性能和耐油性能的影响；同时热压时塑料可以更均匀充分地渗入到云母纸层，从而形成微观结构上更加致密、电气性能和机械性能更为优异的复合片材，所使用的热熔膜层为低介电常数，可以大幅提高云母纸复合片材的局部放电起始电压，满足新能源汽车800V高压电机的性能要求。4. According to the corona-resistant composite sheet for new energy vehicle motors of the present application, high-temperature resistant plastic is used as the hot-melt film layer to fuse mica flakes, and no other adhesives are used, which can reduce the influence of adhesives on the mechanical properties, electrical properties, heat resistance and oil resistance of the composite sheet; at the same time, during hot pressing, the plastic can penetrate into the mica paper layer more evenly and fully, thereby forming a composite sheet with a denser microstructure and better electrical and mechanical properties. The hot-melt film layer used has a low dielectric constant, which can greatly improve the local discharge starting voltage of the mica paper composite sheet, meeting the performance requirements of 800V high-voltage motors of new energy vehicles.
5.根据本申请的用于新能源汽车电机的耐电晕复合片材的制备方法，通过根据第一热熔膜层、第二热熔膜层和云母纸层的厚度和组成不同，设置匹配的热压温度和压力，使第一热熔膜层、第二热熔膜层和云母纸层三者能够达到完全融合状态，避免出现相邻层之间部分界面融合，影响复合片材的性能。5. According to the preparation method of the corona-resistant composite sheet for new energy vehicle motors of the present application, by setting matching hot pressing temperature and pressure according to the different thicknesses and compositions of the first hot-melt film layer, the second hot-melt film layer and the mica paper layer, the first hot-melt film layer, the second hot-melt film layer and the mica paper layer can be completely fused to avoid partial interface fusion between adjacent layers, which would affect the performance of the composite sheet.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
此处所说明的附图用来提供对本申请的进一步理解，构成本申请的一部分，本申请的示意性实施例及其说明用于解释本申请，并不构成对本申请的不当限定。在附图中：The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:
图1为本申请实施例涉及的用于新能源汽车电机的耐电晕复合片材的材料组成示意图；FIG1 is a schematic diagram of the material composition of a corona-resistant composite sheet for a new energy vehicle motor according to an embodiment of the present application;
图2为本申请实施例涉及的用于新能源汽车电机的耐电晕复合片材截面示意图。FIG2 is a schematic cross-sectional view of a corona-resistant composite sheet for use in new energy vehicle motors according to an embodiment of the present application.
附图标记：
1第一热熔膜层；2云母纸层；21云母鳞片；22补强材料；3第二热
熔膜层。Reference numerals:
1 first hot-melt film layer; 2 mica paper layer; 21 mica flakes; 22 reinforcing material; 3 second hot-melt film layer.
具体实施方式Detailed ways
下面结合实施例详述本申请，但本申请并不局限于这些实施例。 The present application is described in detail below with reference to embodiments, but the present application is not limited to these embodiments.
除非另行定义，文中所使用的所有专业与科学用语与本领域熟练人员所熟悉的意义相同。本发明所使用的试剂或原料均可通过常规途径购买获得，如无特殊说明，本发明所使用的试剂或原料均按照本领域常规方式使用或者按照产品说明书使用。此外，任何与所记载内容相似或均等的方法及材料皆可应用于本发明方法中。本专利中所述的较佳实施方法与材料仅作示范之用。Unless otherwise defined, all professional and scientific terms used herein have the same meanings as those familiar to those skilled in the art. The reagents or raw materials used in the present invention can be purchased through conventional channels. Unless otherwise specified, the reagents or raw materials used in the present invention are used in a conventional manner in the art or in accordance with the product instructions. In addition, any method and material similar or equivalent to the described content can be applied to the method of the present invention. The preferred implementation methods and materials described in this patent are for demonstration purposes only.
本实施例中第一热熔膜层、第二热熔膜层和云母纸层均通过常规热压或抄造等其他工艺制备得到。In this embodiment, the first hot-melt film layer, the second hot-melt film layer and the mica paper layer are all prepared by conventional hot pressing or other processes such as papermaking.
实施例1 复合片材1#Example 1 Composite sheet 1#
复合片材1#包括以下重量百分比的原料制备而成：第一热熔膜层10％、云母纸层80％和第二热熔膜层10％；第一热熔膜层、云母纸层和第二热熔膜层在厚度方向上完全融合。Composite sheet 1# is made of the following raw materials in weight percentage: 10% first hot-melt film layer, 80% mica paper layer and 10% second hot-melt film layer; the first hot-melt film layer, mica paper layer and second hot-melt film layer are completely fused in the thickness direction.
其中，第一热熔膜层的厚度为0.02mm，云母纸层的厚度为0.20mm，第二热熔膜层的厚度为0.02mm。第一热熔膜层和为第二热熔膜层均为四氟乙烯-全氟烷氧基乙烯基醚共聚物，介电常数为2.03。第一热熔膜层和第二热熔膜层还包括无机纳米颗粒，无机纳米颗粒为氮化硼，粒径为20nm，添加量为第一热熔膜层重量的5％。云母纸层包括云母鳞片，云母鳞片粒径为30目。云母纸层还包括沉析间位芳纶纤维，添加量为云母纸层重量的5％。The thickness of the first hot-melt film layer is 0.02 mm, the thickness of the mica paper layer is 0.20 mm, and the thickness of the second hot-melt film layer is 0.02 mm. The first hot-melt film layer and the second hot-melt film layer are both tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymers, and the dielectric constant is 2.03. The first hot-melt film layer and the second hot-melt film layer also include inorganic nanoparticles, the inorganic nanoparticles are boron nitride, the particle size is 20 nm, and the addition amount is 5% of the weight of the first hot-melt film layer. The mica paper layer includes mica flakes, and the particle size of the mica flakes is 30 meshes. The mica paper layer also includes precipitated meta-aramid fibers, and the addition amount is 5% of the weight of the mica paper layer.
复合片材1#的制备方法包括以下步骤：The preparation method of composite sheet 1# comprises the following steps:
(1)将第一热熔膜层、云母纸层和第二热熔膜层放卷并依次叠放在一起，层与层之间不需要涂覆胶黏剂；(1) unwinding the first hot-melt film layer, the mica paper layer, and the second hot-melt film layer and stacking them together in sequence, without coating adhesive between the layers;
(2)将叠放好的多层材料经热辊热压，热压温度为380℃，压力为20MPa；(2) The stacked multilayer materials are hot-pressed by hot rollers at a temperature of 380°C and a pressure of 20 MPa;
(3)热压完成后即得用于新能源汽车电机的耐电晕复合片材1#。(3) After hot pressing, the corona-resistant composite sheet 1# for new energy vehicle motors is obtained.
实施例2 复合片材2#Example 2 Composite sheet 2#
复合片材2#包括以下重量百分比的原料制备而成：第一热熔膜层30％、云母纸层40％和第二热熔膜层30％；第一热熔膜层、云母纸层和第二热熔膜层在厚度方向上完全融合。Composite sheet 2# is made of the following raw materials in weight percentage: 30% first hot-melt film layer, 40% mica paper layer and 30% second hot-melt film layer; the first hot-melt film layer, mica paper layer and second hot-melt film layer are completely fused in the thickness direction.
其中，第一热熔膜层的厚度为0.08mm，云母纸层的厚度为0.10mm，第二热熔膜层的厚度为0.08mm。第一热熔膜层和为第二热熔膜层均为聚醚 醚酮，介电常数为3.2。第一热熔膜层和第二热熔膜层还包括无机纳米颗粒，无机纳米颗粒为三氧化二铝，粒径为400nm，添加量为第一热熔膜层重量的10％。云母纸层包括云母鳞片，云母鳞片粒径为400目。云母纸层还包括短切玻璃纤维，添加量为云母纸层重量的15％。The thickness of the first hot-melt film layer is 0.08 mm, the thickness of the mica paper layer is 0.10 mm, and the thickness of the second hot-melt film layer is 0.08 mm. Both the first hot-melt film layer and the second hot-melt film layer are made of polyether Ether ketone, the dielectric constant is 3.2. The first hot melt film layer and the second hot melt film layer also include inorganic nanoparticles, the inorganic nanoparticles are aluminum oxide, the particle size is 400nm, and the addition amount is 10% of the weight of the first hot melt film layer. The mica paper layer includes mica flakes, and the particle size of the mica flakes is 400 mesh. The mica paper layer also includes chopped glass fibers, and the addition amount is 15% of the weight of the mica paper layer.
复合片材2#的制备方法包括以下步骤：The preparation method of composite sheet 2# comprises the following steps:
(1)将第一热熔膜层、云母纸层和第二热熔膜层放卷并依次叠放在一起，层与层之间不需要涂覆胶黏剂；(1) unwinding the first hot-melt film layer, the mica paper layer, and the second hot-melt film layer and stacking them together in sequence, without coating adhesive between the layers;
(2)将叠放好的多层材料经热辊热压，热压温度为390℃，压力为15MPa；(2) The stacked multilayer materials are hot-pressed by hot rollers at a temperature of 390°C and a pressure of 15 MPa;
(3)热压完成后即得用于新能源汽车电机的耐电晕复合片材2#。(3) After hot pressing, the corona-resistant composite sheet 2# for new energy vehicle motors is obtained.
实施例3 复合片材3#Example 3 Composite sheet 3#
复合片材3#包括以下重量百分比的原料制备而成：第一热熔膜层20％、云母纸层60％和第二热熔膜层20％；第一热熔膜层、云母纸层和第二热熔膜层在厚度方向上完全融合。Composite sheet 3# is made of the following raw materials in weight percentage: 20% first hot-melt film layer, 60% mica paper layer and 20% second hot-melt film layer; the first hot-melt film layer, mica paper layer and second hot-melt film layer are completely fused in the thickness direction.
其中，第一热熔膜层的厚度为0.10mm，云母纸层的厚度为0.20mm，第二热熔膜层的厚度为0.10mm。第一热熔膜层和为第二热熔膜层均为聚苯硫醚，介电常数为3.1。第一热熔膜层和第二热熔膜层还包括无机纳米颗粒，无机纳米颗粒为二氧化钛，粒径为800nm，添加量为第一热熔膜层重量的10％。云母纸层包括云母鳞片，云母鳞片粒径为800目。云母纸层还包括沉析间位芳纶纤维，添加量为云母纸层重量的20％。The thickness of the first hot-melt film layer is 0.10 mm, the thickness of the mica paper layer is 0.20 mm, and the thickness of the second hot-melt film layer is 0.10 mm. The first hot-melt film layer and the second hot-melt film layer are both polyphenylene sulfide, and the dielectric constant is 3.1. The first hot-melt film layer and the second hot-melt film layer also include inorganic nanoparticles, the inorganic nanoparticles are titanium dioxide, the particle size is 800 nm, and the addition amount is 10% of the weight of the first hot-melt film layer. The mica paper layer includes mica flakes, and the particle size of the mica flakes is 800 mesh. The mica paper layer also includes precipitated meta-aramid fibers, and the addition amount is 20% of the weight of the mica paper layer.
复合片材3#的制备方法包括以下步骤：The preparation method of composite sheet 3# comprises the following steps:
(1)将第一热熔膜层、云母纸层和第二热熔膜层放卷并依次叠放在一起，层与层之间不需要涂覆胶黏剂；(1) unwinding the first hot-melt film layer, the mica paper layer, and the second hot-melt film layer and stacking them together in sequence, without coating adhesive between the layers;
(2)将叠放好的多层材料经热辊热压，热压温度为300℃，压力为15MPa；(2) The stacked multilayer materials are hot-pressed by hot rollers at a temperature of 300°C and a pressure of 15 MPa;
(3)热压完成后即得用于新能源汽车电机的耐电晕复合片材3#。(3) After hot pressing, the corona-resistant composite sheet 3# for new energy vehicle motors is obtained.
实施例4 复合片材4#Example 4 Composite sheet 4#
复合片材4#包括以下重量百分比的原料制备而成：第一热熔膜层20％、云母纸层60％和第二热熔膜层20％；第一热熔膜层、云母纸层和第二热熔膜层在厚度方向上完全融合。 Composite sheet 4# is made of the following raw materials in weight percentage: 20% first hot-melt film layer, 60% mica paper layer and 20% second hot-melt film layer; the first hot-melt film layer, mica paper layer and second hot-melt film layer are completely fused in the thickness direction.
其中，第一热熔膜层的厚度为0.10mm，云母纸层的厚度为0.20mm，第二热熔膜层的厚度为0.10mm。第一热熔膜层和为第二热熔膜层均为聚苯硫醚，介电常数为3.1。云母纸层包括云母鳞片，云母鳞片粒径为600目。The thickness of the first hot-melt film layer is 0.10 mm, the thickness of the mica paper layer is 0.20 mm, and the thickness of the second hot-melt film layer is 0.10 mm. The first hot-melt film layer and the second hot-melt film layer are both polyphenylene sulfide with a dielectric constant of 3.1. The mica paper layer includes mica flakes with a particle size of 600 mesh.
复合片材4#的制备方法包括以下步骤：The preparation method of composite sheet 4# comprises the following steps:
(1)将第一热熔膜层、云母纸层和第二热熔膜层放卷并依次叠放在一起，层与层之间不需要涂覆胶黏剂；(1) unwinding the first hot-melt film layer, the mica paper layer, and the second hot-melt film layer and stacking them together in sequence, without coating adhesive between the layers;
(2)将叠放好的多层材料经热辊热压，热压温度为295℃，压力为10MPa；(2) The stacked multilayer materials are hot-pressed by hot rollers at a temperature of 295° C. and a pressure of 10 MPa;
(3)热压完成后即得用于新能源汽车电机的耐电晕复合片材4#。(3) After hot pressing, the corona-resistant composite sheet 4# for new energy vehicle motors is obtained.
对比例1 对比复合片材1#Comparative Example 1 Comparative Composite Sheet 1#
对比复合片材1#与复合片材3#的区别在于，对比复合片材1#没有第二热熔膜层，只有第一热熔膜层，第一热熔膜层20％，云母纸层80％，制备方法同实施例3。The difference between the comparative composite sheet 1# and the composite sheet 3# is that the comparative composite sheet 1# has no second hot-melt film layer, but only the first hot-melt film layer, the first hot-melt film layer is 20%, and the mica paper layer is 80%. The preparation method is the same as that of Example 3.
对比例2 对比复合片材2#Comparative Example 2 Comparative Composite Sheet 2#
对比复合片材2#与复合片材3#的区别在于，第一热熔膜层5％、云母纸层90％和第二热熔膜层5％，制备方法同实施例3。The difference between the composite sheet 2# and the composite sheet 3# is that the first hot-melt film layer is 5%, the mica paper layer is 90% and the second hot-melt film layer is 5%. The preparation method is the same as that of Example 3.
对比例3 对比复合片材3#Comparative Example 3 Comparative Composite Sheet 3#
对比复合片材3#与复合片材3#的区别在于：对比复合片材3#第一热熔膜层和第二热熔膜层采用的塑料为聚邻苯二甲酰胺，介电常数为4.3，其余相同。The difference between the comparative composite sheet 3# and the composite sheet 3# is that the plastic used in the first hot-melt film layer and the second hot-melt film layer of the comparative composite sheet 3# is polyphthalamide, and the dielectric constant is 4.3, and the rest is the same.
对比例4 对比复合片材4#Comparative Example 4 Comparative Composite Sheet 4#
对比复合片材4#与复合片材3#的区别在于：制备方法的步骤(2)中热压温度为200℃，压力为5MPa。The difference between the composite sheet 4# and the composite sheet 3# is that the hot pressing temperature in step (2) of the preparation method is 200°C and the pressure is 5 MPa.
实验例Experimental example
1.电气性能1. Electrical performance
PDIV(局部放电起始电压)：试验按照国标GB/T 7354-2018进行，交流电压频率：50hz；升压速度：50V/s；以局部放电量10PC作为起始放电电压点；实验温度：21-25℃，湿度：45-55％。PDIV (Partial Discharge Initiation Voltage): The test is carried out in accordance with the national standard GB/T 7354-2018, AC voltage frequency: 50hz; boost speed: 50V/s; partial discharge quantity 10PC is used as the starting discharge voltage point; experimental temperature: 21-25℃, humidity: 45-55%.
2.耐温性能实验2. Temperature resistance test
实验方法：试验按照国标GB/T 4074.7-2009进行，采用三点法进行材 料耐热等级评定。Experimental method: The test was carried out in accordance with the national standard GB/T 4074.7-2009, using the three-point method. Material heat resistance rating.
3.拉伸强度3. Tensile strength
实验方法：按照国标GB/T 20629.2-2013和GB/T 5591.2-2017测定。Experimental method: Determined in accordance with national standards GB/T 20629.2-2013 and GB/T 5591.2-2017.
4.方波耐电晕寿命4. Square wave corona resistance life
实验方法：试验按照T/CEEIA 415-2019标准进行，测试条件：峰峰电压Vp-p＝3000V，温度155±3℃，频率＝20KHz，上升沿100±10ns，占空比50％。Experimental method: The test was carried out in accordance with T/CEEIA 415-2019 standard. Test conditions: peak-to-peak voltage Vp-p = 3000V, temperature 155±3℃, frequency = 20KHz, rising edge 100±10ns, duty cycle 50%.
将复合片材1#-4#和对比复合片材1#-4#分别取样进行以上四项实验测试，实验结果如表1所示。Composite sheets 1#-4# and comparative composite sheets 1#-4# were sampled and tested for the above four tests. The experimental results are shown in Table 1.
表1各复合片材实验数据
Table 1 Experimental data of each composite sheet
图1为本申请实施例1-4制备的用于新能源汽车电机的耐电晕复合片材的材料组成示意图；图2为本申请实施例1-4制备的用于新能源汽车电机的耐电晕复合片材截面示意图。Figure 1 is a schematic diagram of the material composition of the corona-resistant composite sheet for new energy vehicle motors prepared in Examples 1-4 of the present application; Figure 2 is a schematic diagram of the cross-section of the corona-resistant composite sheet for new energy vehicle motors prepared in Examples 1-4 of the present application.
由以上实验数据可知，通过本申请所限定的原料和方法所制备的复合片材1#-4#较高的PDIV，方波耐电晕寿命长，耐高温性能优异，力学性能优异。From the above experimental data, it can be seen that the composite sheets 1#-4# prepared by the raw materials and methods specified in this application have higher PDIV, long square wave corona resistance life, excellent high temperature resistance and excellent mechanical properties.
对比复合材料1#使用单层热熔膜层，最终结果电气性能一般，耐高温性能一般；对比复合材料2#中使用第一和第二热熔膜层占比低于本申请限 定的范围，最终结果电气性能一般，耐高温性能一般。The comparison composite material 1# uses a single layer of hot-melt film, and the final result has average electrical performance and average high temperature resistance. The comparison composite material 2# uses the first and second hot-melt film layers in a proportion lower than the limit of this application. Within a certain range, the final result is that the electrical performance is average and the high temperature resistance performance is average.
对比复合材料3#使用介电常数较大的塑料，最终结果电气性能一般，PDIV较低；对比复合材料4#使用温度低于本申请限定范围，最终第一、第二热熔膜层与云母纸层融合效果差，产生了部分界面融合，结果电气性能一般，方波耐电晕寿命短，力学性能一般。For comparison, composite material 3# used a plastic with a larger dielectric constant, and the final result was average electrical performance and low PDIV; for comparison, composite material 4# used a temperature lower than the specified range of this application, and the final fusion effect between the first and second hot-melt film layers and the mica paper layer was poor, resulting in partial interface fusion, resulting in average electrical performance, short square wave corona resistance life, and average mechanical properties.
以上所述，仅为本申请的实施例而已，本申请的保护范围并不受这些具体实施例的限制，而是由本申请的权利要求书来确定。对于本领域技术人员来说，本申请可以有各种更改和变化。凡在本申请的技术思想和原理之内所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。 The above is only the embodiment of the present application, and the protection scope of the present application is not limited by these specific embodiments, but is determined by the claims of the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the technical ideas and principles of the present application should be included in the protection scope of the present application.

Claims (10)

  1. 一种用于新能源汽车电机的耐电晕复合片材，其特征在于，包括以下重量百分比的原料制备而成：第一热熔膜层10-40％、云母纸层20-80％和第二热熔膜层10-40％。A corona-resistant composite sheet for new energy vehicle motors, characterized in that it is made of raw materials in the following weight percentages: 10-40% of a first hot-melt film layer, 20-80% of a mica paper layer, and 10-40% of a second hot-melt film layer.
  2. 根据权利要求1所述的用于新能源汽车电机的耐电晕复合片材，其特征在于，所述第一热熔膜层、所述云母纸层和所述第二热熔膜层之间不使用胶黏剂。The corona-resistant composite sheet for new energy vehicle motors according to claim 1, characterized in that no adhesive is used between the first hot-melt film layer, the mica paper layer and the second hot-melt film layer.
  3. 根据权利要求1所述的用于新能源汽车电机的耐电晕复合片材，其特征在于，所述第一热熔膜层的厚度为0.02-0.15mm，所述云母纸层的厚度为0.05-0.20mm，所述第二热熔膜层的厚度为0.02-0.15mm；The corona-resistant composite sheet for new energy vehicle motors according to claim 1, characterized in that the thickness of the first hot-melt film layer is 0.02-0.15 mm, the thickness of the mica paper layer is 0.05-0.20 mm, and the thickness of the second hot-melt film layer is 0.02-0.15 mm;
    所述第一热熔膜层、所述云母纸层和所述第二热熔膜层的厚度比例为1:2:1。The thickness ratio of the first hot-melt film layer, the mica paper layer and the second hot-melt film layer is 1:2:1.
  4. 根据权利要求1所述的用于新能源汽车电机的耐电晕复合片材，其特征在于，所述第一热熔膜层选自聚苯硫醚、聚偏二氟乙烯、四氟乙烯-全氟烷氧基乙烯基醚共聚物、氟化乙烯丙烯共聚物、乙烯-四氟乙烯共聚物、聚醚醚酮和聚醚酰亚胺中的一种或多种。The corona-resistant composite sheet for new energy vehicle motors according to claim 1 is characterized in that the first hot-melt film layer is selected from one or more of polyphenylene sulfide, polyvinylidene fluoride, tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer, fluorinated ethylene propylene copolymer, ethylene-tetrafluoroethylene copolymer, polyetheretherketone and polyetherimide.
  5. 根据权利要求1所述的用于新能源汽车电机的耐电晕复合片材，其特征在于，所述第二热熔膜层选自聚苯硫醚、聚偏二氟乙烯、四氟乙烯-全氟烷氧基乙烯基醚共聚物、氟化乙烯丙烯共聚物、乙烯-四氟乙烯共聚物、聚醚醚酮和聚醚酰亚胺中的一种或多种。The corona-resistant composite sheet for new energy vehicle motors according to claim 1 is characterized in that the second hot-melt film layer is selected from one or more of polyphenylene sulfide, polyvinylidene fluoride, tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer, fluorinated ethylene propylene copolymer, ethylene-tetrafluoroethylene copolymer, polyetheretherketone and polyetherimide.
  6. 根据权利要求1所述的用于新能源汽车电机的耐电晕复合片材，其特征在于，所述第一热熔膜层和/或所述第二热熔膜层还包括无机纳米颗粒。The corona-resistant composite sheet for new energy vehicle motors according to claim 1 is characterized in that the first hot-melt film layer and/or the second hot-melt film layer further comprises inorganic nanoparticles.
  7. 根据权利要求6所述的用于新能源汽车电机的耐电晕复合片材，其特征在于，所述无机纳米颗粒为二氧化硅、三氧化二铝、氮化硼、氮化铝和二氧化钛中的一种或几种，所述无机纳米颗粒的粒径为10nm-800nm。The corona-resistant composite sheet for new energy vehicle motors according to claim 6 is characterized in that the inorganic nanoparticles are one or more of silicon dioxide, aluminum oxide, boron nitride, aluminum nitride and titanium dioxide, and the particle size of the inorganic nanoparticles is 10nm-800nm.
  8. 根据权利要求1所述的用于新能源汽车电机的耐电晕复合片材，其特征在于，所述云母纸层包括云母鳞片和补强材料，所述云母鳞片粒径为30目-800目。 The corona-resistant composite sheet for new energy vehicle motors according to claim 1 is characterized in that the mica paper layer comprises mica flakes and reinforcing materials, and the mica flakes have a particle size of 30 mesh to 800 mesh.
  9. 根据权利要求8所述的用于新能源汽车电机的耐电晕复合片材，其特征在于，所述补强材料包括芳纶纤维、玻璃纤维中的一种或两种。The corona-resistant composite sheet for new energy vehicle motors according to claim 8, characterized in that the reinforcing material comprises one or both of aramid fiber and glass fiber.
  10. 一种如权利要求1-9中任一项所述的用于新能源汽车电机的耐电晕复合片材的制备方法，其特征在于，包括以下步骤：A method for preparing a corona-resistant composite sheet for a new energy vehicle motor according to any one of claims 1 to 9, characterized in that it comprises the following steps:
    (1)将第一热熔膜层、云母纸层和第二热熔膜层放卷并依次叠放在一起，层与层之间不需要涂覆胶黏剂；(1) unwinding the first hot-melt film layer, the mica paper layer, and the second hot-melt film layer and stacking them together in sequence, without coating adhesive between the layers;
    (2)将叠放好的多层材料经热辊热压，热压温度为290-390℃，压力为5-20MPa；(2) hot pressing the stacked multilayer materials with hot rollers at a temperature of 290-390° C. and a pressure of 5-20 MPa;
    (3)热压完成后即得所述用于新能源汽车电机的耐电晕复合片材。 (3) After the hot pressing is completed, the corona-resistant composite sheet for new energy vehicle motors is obtained.
PCT/CN2024/070842 2023-01-10 2024-01-05 Corona-resistant composite sheet for electric motor of new energy vehicle, and preparation method therefor WO2024120545A1 (en)

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