CN116144128A - Corona-resistant plastic-based composite material, preparation method thereof, corona-resistant composite sheet and motor stator - Google Patents

Corona-resistant plastic-based composite material, preparation method thereof, corona-resistant composite sheet and motor stator Download PDF

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Publication number
CN116144128A
CN116144128A CN202310037057.8A CN202310037057A CN116144128A CN 116144128 A CN116144128 A CN 116144128A CN 202310037057 A CN202310037057 A CN 202310037057A CN 116144128 A CN116144128 A CN 116144128A
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corona
plastic
composite material
based composite
resistant plastic
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郑广会
王文
张铃
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Tianweilan Electric Drive Technology Jiangsu Co ltd
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Tianweilan Electric Drive Technology Jiangsu Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • 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
    • 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
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • 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
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • 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
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
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    • C08L81/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing sulfur with or without nitrogen, oxygen or carbon only; Compositions of polysulfones; Compositions of derivatives of such polymers
    • C08L81/02—Polythioethers; Polythioether-ethers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/04—Details of the magnetic circuit characterised by the material used for insulating the magnetic circuit or parts thereof
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/30—Windings characterised by the insulating material
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/32—Windings characterised by the shape, form or construction of the insulation
    • H02K3/34—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation
    • H02K3/345—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation between conductor and core, e.g. slot insulation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/32—Windings characterised by the shape, form or construction of the insulation
    • H02K3/40—Windings characterised by the shape, form or construction of the insulation for high voltage, e.g. affording protection against corona discharges
    • 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
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0261—Polyamide fibres
    • B32B2262/0269—Aromatic polyamide fibres
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    • 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
    • C08J2327/00—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 a halogen; Derivatives of such polymers
    • C08J2327/02—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 a halogen; Derivatives of such polymers not modified by chemical after-treatment
    • C08J2327/12—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 a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C08J2327/18—Homopolymers or copolymers of tetrafluoroethylene
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    • C08J2361/00—Characterised by the use of condensation polymers of aldehydes or ketones; Derivatives of such polymers
    • C08J2361/04—Condensation polymers of aldehydes or ketones with phenols only
    • C08J2361/16—Condensation polymers of aldehydes or ketones with phenols only of ketones with phenols
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    • C08J2477/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
    • C08J2477/10—Polyamides derived from aromatically bound amino and carboxyl groups of amino carboxylic acids or of polyamines and polycarboxylic acids
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08K3/20—Oxides; Hydroxides
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    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
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Abstract

The application discloses corona-resistant plastic-based composite material and preparation method thereof, corona-resistant composite sheet and motor stator, the corona-resistant plastic-based composite material is used for motors, batteries or electric control systems of new energy vehicles, and the corona-resistant plastic-based composite material is prepared from the following raw materials: matrix plastics and modified reinforcing materials; the matrix plastic is thermoplastic plastic with high temperature resistance of more than 180 ℃, and the modified reinforcing material is mica flake; the corona-resistant plastic-based composite material is a film, a sheet or a section bar. The composite material prepared by the application has the advantages that the high-temperature-resistant thermoplastic matrix resin, the mica flakes, the inorganic nano particles and the reinforcing fibers are fully melted to form a compact integral structure, and the composite material has excellent corona resistance, electrical strength, heat resistance, mechanical property, high Partial Discharge Initiation Voltage (PDIV) and good application process performance.

Description

Corona-resistant plastic-based composite material, preparation method thereof, corona-resistant composite sheet and motor stator
Technical Field
The application relates to a corona-resistant plastic-based composite material, a preparation method thereof, a corona-resistant composite sheet and a motor stator, and belongs to the technical field of corona-resistant composite materials for new energy motors.
Background
The prior high-temperature resistant H-grade or above slot insulation and interphase insulation paper for the new energy automobile motor is mostly aramid fiber pure paper or is formed by compounding aramid fiber paper with a polyimide film and using a high-temperature resistant adhesive, and the typical composite paper structure is Nomex fiber paper/PI film/Nomex fiber paper (NHN), and the composite adhesive is mostly epoxy, polyurethane or polyacrylate adhesive. The aramid fiber pure paper or the NHN composite paper has higher heat resistance, is very excellent in performance of an insulation structure of a 400V voltage platform motor for a new energy automobile, however, for an 800V voltage platform motor, the highest safe voltage of the aramid fiber pure paper or the NHN composite paper can reach 2300V or even higher due to higher voltage level and the influence of environmental factors, which is far higher than the Partial Discharge Initial Voltage (PDIV) of the existing insulation material for the conventional piezoelectric motor, and the probability of generating partial discharge in the operation process of the motor is very high, so that corona resistance of the insulation material is required to be considered for the 800V voltage platform motor.
In the prior art, the corona-resistant service life of the composite paper is improved by adding a mica component into the organic aramid fiber paper or by using modes of epoxy, polyurethane or polyacrylate adhesive to composite the aramid fiber paper and the mica paper. However, the mica-containing composite paper prepared in the two modes has the problems of easy powder falling, easy layering, easy fragmentation and the like, has common corona resistance and high temperature resistance, has lower Partial Discharge Initiation Voltage (PDIV), and cannot meet the process requirements of the large-batch application of the new energy automobile motor.
Disclosure of Invention
In order to solve the problems, the corona-resistant plastic-based composite material, the preparation method thereof, the corona-resistant composite sheet and the motor stator are provided, and the composite material prepared by the application has the advantages that high-temperature-resistant thermoplastic matrix resin, mica flakes, inorganic nano particles and reinforcing fibers are fully melted to form a compact integral structure, and the corona-resistant plastic-based composite material has excellent corona resistance, electrical strength, heat resistance, mechanical properties, high Partial Discharge Initiation Voltage (PDIV) and good application process performance.
According to one aspect of the present application, there is provided a corona resistant plastic-based composite for use in a motor, battery or electrical control system of a new energy vehicle,
the corona-resistant plastic-based composite material is prepared from the following raw materials: matrix plastics and modified reinforcing materials; the matrix plastic is thermoplastic plastic with high temperature resistance of more than 180 ℃, and the modified reinforcing material is mica flake; the corona-resistant plastic-based composite material is a film, a sheet or a section bar.
Preferably, the base plastic is a thermoplastic plastic which is resistant to high temperature of 180 ℃ or more and resistant to oil.
Mica flakes are added into thermoplastic matrix plastic to modify the original matrix material, so that corona resistance of the thermoplastic matrix plastic is improved, and the matrix plastic also has oil resistance, so that the thermoplastic matrix plastic can adapt to complex environments with oil in equipment and the like, and has strong adaptability.
Optionally, the matrix plastic comprises at least one of liquid crystal high molecular polymer, polytetrafluoroethylene, tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer, fluorinated ethylene propylene copolymer, ethylene-tetrafluoroethylene copolymer, polyphenylene sulfide, polyether ether ketone and polyetherimide.
Optionally, the dielectric constant of the matrix plastic is less than 4; preferably, the dielectric constant of the matrix plastic is less than 3. The partial discharge initiation voltage (PD IV) can be increased by selecting a matrix plastic with a smaller dielectric constant.
Optionally, the modified reinforcement material further comprises inorganic nanoparticles.
Optionally, the inorganic nanoparticles comprise at least one of silica, alumina, boron nitride, aluminum nitride, and titanium dioxide; the particle size of the inorganic nano particles is 10-800nm. The corona resistance of the material is improved by adding the inorganic nano particles and limiting the particle size and the combined action of the inorganic nano particles and the mica flakes, and the dispersion uniformity of the inorganic nano particles is good.
Optionally, in the corona-resistant plastic-based composite material, the content of the mica flakes is 10% -60%, and the content of the inorganic nanoparticles is 5% -30%.
Optionally, the modified reinforcing material further comprises insulating fibers resistant to high temperature of more than 180 ℃; the insulating fiber comprises at least one of chopped glass fiber and precipitated meta-aramid fiber;
in the corona-resistant plastic-based composite material, the content of the insulating fiber is 5% -30%. Chopped glass fibers or aramid fibers are added to improve the mechanical properties and application manufacturability of the material.
According to another aspect of the present application, there is provided a method for preparing the corona resistant plastic-based composite material described above, wherein the base plastic and the modified reinforcing material in the form of particles and/or powder are mixed together to form a mixed material, and the mixed material is prepared into the corona resistant plastic-based composite material by any one of continuous hot pressing, extrusion molding, sintering molding and blow molding.
According to yet another aspect of the present application, there is also provided a corona resistant composite sheet comprising a corona resistant layer and an aramid fiber layer, the corona resistant layer being any one of the corona resistant plastic-based composite materials described above or a corona resistant plastic-based composite material prepared by the above preparation method;
the aramid fiber layer is attached to at least one surface of the corona resistant layer.
Preferably, the aramid fiber layer is attached to two sides of the corona resistant layer, the aramid fiber layer is aramid fiber paper, and the aramid fiber paper and the corona resistant layer are bonded together through an adhesive (such as a perfluoroethylene adhesive and the like). Resin adhesive is convenient to permeate through the aramid fiber paper, so that the paint hanging amount and the insulativity can be improved when a subsequent paint dipping process is carried out on the motor stator of the new energy automobile, and the composite insulating sheet can be better adhered with the stator core and the enameled wire.
According to still another aspect of the present application, there is also provided a motor stator for an electrically driven vehicle, in which any one of the above corona resistant plastic-based composite materials or the corona resistant plastic-based composite material prepared by the above preparation method is disposed in a slot and/or at intervals, or in which the above corona resistant composite sheet is disposed in a slot and/or at intervals.
Benefits of the present application include, but are not limited to:
1. according to the corona-resistant plastic-based composite material, the high-temperature-resistant thermoplastic matrix resin, the mica flakes, the inorganic nano particles and the reinforcing fibers are fully melted to form a compact integral structure, so that the corona-resistant plastic-based composite material has excellent corona resistance, electrical strength, heat resistance, mechanical properties, high Partial Discharge Initiation Voltage (PDIV) and good application process performance.
2. According to the corona-resistant plastic-based composite material, the base plastic with high temperature resistance, oil resistance and small dielectric constant is used, and the mica flake and the inorganic nano particles are used for reinforcing modification, so that the mica flake has better corona resistance compared with mica in other states, the dual corona resistance of the mica flake structure and the nano particles can obviously improve the corona resistance service life of the composite material, and the composite material has excellent corona resistance and higher PDIV.
3. According to the corona-resistant plastic-based composite material, the chopped glass fibers and the fibrid meta-aramid fibers are used, the fibrid is light and thin and membranous, the fibrid can be adhered to the rod-shaped chopped fibers, the fibrid is helpful to form a fiber support, when the fiber support is subjected to external force, the fiber support can play a role in transmitting stress, and the fiber and other modified reinforcing materials are interwoven into a network structure, so that the composite material is high in density, excellent in corona resistance and long in service life.
4. According to the corona resistant plastic-based composite material of the present application, the composite material as a sheet may be folded into an appropriate shape, provided in a slot of a motor stator (as slot bottom paper or slot cover paper), or provided at an inter-phase of the motor stator (as inter-phase paper), for example; the insulating material used as the section bar can be provided with an external shape which is suitable for the internal shape of the stator slot of the motor, for example, is U-shaped, so that the insulating material can be directly inserted into the stator slot; the film, sheet or section can be used as an insulating material of a new energy automobile motor, a battery or an electric control system, so that the corona-resistant service life of the insulating system is greatly improved, and meanwhile, the film, sheet or section has excellent heat resistance, mechanical property and application technical performance.
5. According to the corona-resistant composite sheet, one layer of the composite sheet is the composite material, and one or two sides of the composite sheet can be attached with aramid fiber paper, so that when a paint dipping process is carried out on a motor stator of a new energy automobile, the paint hanging amount and the insulativity can be improved, and the composite insulating sheet can be bonded with a stator core and an enameled wire better.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
FIG. 1 is a schematic structural view of a corona resistant plastic matrix composite according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a corona resistant composite sheet material according to an embodiment of the present application.
Reference numerals: 1. an insulating fiber; 2. a base plastic; 3. mica flakes; 4. an inorganic nanoparticle; 5. a corona resistant layer; 6. an aramid fiber layer; 7. and (3) an adhesive.
Detailed Description
The present application is described in detail below with reference to examples, but the present application is not limited to these examples.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The reagents or materials used in the present invention may be purchased in conventional manners, and unless otherwise indicated, they may be used in conventional manners in the art or according to the product specifications. In addition, any methods and materials similar or equivalent to those described herein can be used in the methods of the present invention. The preferred methods and materials described in this patent are illustrative only.
The base plastic, film thereof, and the like used in the present application are all commercially available products.
Example 1 composite 1# (sheet)
The composite material 1# is prepared from the following raw materials in percentage by weight: 40% of matrix plastic and 60% of mica flake, wherein the matrix plastic is tetrafluoroethylene-perfluoro alkoxy vinyl ether copolymer, and the dielectric constant is 2.03.
The preparation method of the composite material 1# comprises the following specific steps:
(1) Uniformly mixing granular matrix plastic and mica flakes;
(2) Spreading the mixed raw materials in a hot-pressing die;
(3) Hot-pressing the raw materials into an integrated composite material 1# through hot-pressing equipment; the hot pressing temperature is 260 ℃ and the hot pressing pressure is 25MPa.
Example 2 composite # 2 (sheet)
The composite material 2# is prepared from the following raw materials in percentage by weight: 40% of matrix plastic and 60% of mica flake, wherein the matrix plastic is tetrafluoroethylene-perfluoro alkoxy vinyl ether copolymer, and the dielectric constant is 2.03.
The preparation method of the composite material No. 2 is continuous hot press molding, and comprises the following specific steps:
(1) Unreeling a first layer of matrix plastic tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer film;
(2) Spraying mica flakes on a first tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer film;
(3) Unreeling and covering a second layer of tetrafluoroethylene-perfluoro alkoxy vinyl ether copolymer film on the mica flake;
(4) Hot-pressing the three-layer material into an integrated composite material No. 2 through continuous hot-pressing composite equipment; the hot pressing temperature is 275 ℃, and the hot pressing pressure is 25MPa.
Example 3 composite 3# (sheet)
The composite material 3# is prepared from the following raw materials in percentage by weight: 60% of matrix plastic, 10% of mica flake and 30% of inorganic nano particles, wherein the matrix plastic is tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer, the dielectric constant is 2.03, and the inorganic nano particles are silicon dioxide, aluminum oxide and boron nitride, and the weight ratio is 2:1:1; the particle size of the inorganic nano-particles is 20nm.
The preparation method of the composite material 3# comprises the following specific steps:
(1) Adding tetrafluoroethylene-perfluor alkoxy vinyl ether particles, mica flakes and inorganic nano particles into a mixer according to a proportion, and uniformly mixing;
(2) Feeding the uniformly mixed mixture into an extruder;
(3) Extruding a sheet with a required thickness through a double-screw extruder and a die;
(4) The four sections of the extruder are respectively controlled at 250 ℃, 280 ℃, 270 ℃ and 260 ℃.
Example 4 composite material # 4 (section bar)
The composite material 4# is prepared from the following raw materials in percentage by weight: 45% of matrix plastic, 50% of mica flakes and 5% of insulating fibers, wherein the matrix plastic is polyphenylene sulfide, the dielectric constant is 3.1, and the insulating fibers are precipitated meta-aramid fibers.
The preparation method of the composite material 4# comprises the following specific steps:
(1) Adding polyphenylene sulfide plastic powder, mica flakes and insulating fibers into a mixer, and uniformly mixing;
(2) Adding the uniformly mixed materials into a profile mold to be prepared;
(3) Heating the die to sinter the materials into a whole to obtain a section bar with a required shape; the sintering temperature was 290 ℃.
Example 5 composite 5# (film)
The composite material No. 5 is prepared from the following raw materials in percentage by weight: 35% of matrix plastic, 30% of mica flakes, 15% of inorganic nano particles and 20% of insulating fibers, wherein the matrix plastic is polyether-ether-ketone, the dielectric constant is 3.2, the insulating fibers are precipitated meta-aramid fibers, the inorganic nano particles are titanium dioxide, and the particle size is 600nm.
The preparation method of the composite material No. 5 is blow molding, and comprises the following specific steps:
(1) Adding polyether-ether-ketone plastic powder, mica flakes, inorganic nano particles and insulating fibers into a mixer, and uniformly mixing;
(2) Feeding the uniformly mixed materials into a double-screw extruder for melt extrusion; the four sections of the extruder are respectively controlled to be 350 ℃, 385 ℃, 390 ℃ and 395 ℃;
(3) Feeding the extrusion materials which are melted and mixed uniformly into a blow molding machine for blow molding to obtain a film material with a required thickness; the blow molding temperature was 390 ℃.
Example 6 composite sheet
The composite sheet material 2 sheet material # prepared in the embodiment 2 is used as a middle corona-resistant layer, the upper side and the lower side are adhered with aramid fiber layers, the aramid fiber layers are aramid fiber base paper, and the adhesive is a poly (perfluoroethylene) adhesive.
The preparation method comprises the following steps:
(1) Unreeling aramid fiber base paper;
(2) Coating a polyperfluoroethylene adhesive on the unreeled aramid fiber base paper;
(3) Unreeling the corona resistant layer material and carrying out hot-pressing compounding on the corona resistant layer material and two sides of aramid fiber base paper coated with the poly (perfluoroethylene) adhesive;
(4) The hot-pressing compounding temperature is 345 ℃, and the hot-pressing pressure is 28MPa:
comparative example 1 comparative composite 1#
The comparative composite material 1# is prepared from the following raw materials in percentage by weight: 40% of matrix plastic and 60% of inorganic nano particles, wherein the inorganic nano particles are silicon dioxide and alumina in a weight ratio of 1:1, the particle size is 50nm, the matrix plastic is tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer, the dielectric constant is 2.03, and the preparation method is the same as that of example 1.
Comparative example 2 comparative composite 2#
The comparative composite material 2# is prepared from the following raw materials in percentage by weight: 70% of matrix plastic and 30% of insulating fiber, wherein the insulating fiber is precipitated meta-aramid fiber, the matrix plastic is polyphenylene sulfide, and the dielectric constant is 3.1, and the preparation method is the same as in example 1.
Comparative example 3 comparative composite 3#
Comparative composite 3# differs from composite 1# in that: the matrix plastic adopted by the comparative composite material 3# is polyphthalamide, the dielectric constant is 4.3, and the rest materials are the same.
Comparative example 4 comparative composite 4#
Comparative composite 4# differs from composite 1# in that: the fibers adopted in the comparative composite material No. 4 are para-aramid fibrids, and the rest are the same.
Experimental example
1. Electrical performance
PDIV (partial discharge initiation voltage): the test is carried out according to national standard GB/T7354-2018, the alternating voltage frequency: 50hz; boost speed: 50V/s; taking the partial discharge quantity 10PC as an initial discharge voltage point; experimental temperature: 21-25 ℃, humidity: 45-55%.
2. Experiment of temperature resistance
The experimental method comprises the following steps: the test is carried out according to national standard GB/T4074.7-2009, and the heat resistance grade of the material is evaluated by adopting a three-point method.
3. Tensile Strength
The experimental method comprises the following steps: measured according to national standards GB/T20629.2-2013 and GB/T5591.2-2017.
4. Corona resistant life of square wave
The experimental method comprises the following steps: the test was performed according to the T/CEEIA 415-2019 standard, test conditions: peak-to-peak voltage Vp-p=3000V, temperature 155±3 ℃, frequency=20 KHz, rising edge 100±10ns, duty cycle 50%.
The composite material 1# -5#, the composite sheet and the comparative composite material 1# -4# were sampled and tested in the above four experiments, and the experimental results are shown in table 1.
Table 1 Performance data for each composite
Figure BDA0004048139100000101
Figure BDA0004048139100000111
FIG. 1 is a schematic structural diagram of corona resistant plastic matrix composites according to examples 1-5 of the present application; fig. 2 is a schematic structural diagram of a corona resistant composite sheet material according to example 6 of the present application.
From the experimental data, the composite material 1# -5# prepared by the raw materials and the method defined in the application and the composite sheet have higher PDIV, long service life of the square wave corona resistance, excellent high temperature resistance and excellent mechanical properties.
Compared with the composite material 1# which uses single inorganic nano particle modified matrix plastic, the final result has the advantages of general electrical performance, general high temperature resistance and poor mechanical property; compared with the composite material No. 2, the single fiber reinforced matrix plastic is used, the final result has the advantages of general electrical performance and general high temperature resistance, and the analysis reason is that the single fiber has larger inertia and has poorer bonding effect with the matrix material.
Compared with the composite material 3# which uses matrix plastics with larger dielectric constant, the final result has general electrical performance, lower PDIV and short corona resistance life of square waves; compared with the composite material 4# which uses para-aramid fibrids, the final result has the advantages of general electrical performance and short corona resistance life of square waves.
The foregoing is merely exemplary of the present application, and the scope of the present application is not limited to the specific embodiments, but is defined by the claims of the present application. Various modifications and changes may be made to the present application by those skilled in the art. 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. A corona-resistant plastic-based composite material for a motor, a battery or an electric control system of a new energy vehicle, characterized in that,
the corona-resistant plastic-based composite material is prepared from the following raw materials: matrix plastics and modified reinforcing materials; the matrix plastic is thermoplastic plastic with high temperature resistance of more than 180 ℃, and the modified reinforcing material is mica flake; the corona-resistant plastic-based composite material is a film, a sheet or a section bar.
2. The corona resistant plastic-based composite of claim 1, wherein said matrix plastic comprises at least one of a liquid crystalline high molecular polymer, polytetrafluoroethylene, tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer, fluorinated ethylene propylene copolymer, ethylene-tetrafluoroethylene copolymer, polyphenylene sulfide, polyetheretherketone, and polyetherimide.
3. The corona resistant plastic matrix composite of claim 1, wherein the dielectric constant of the matrix plastic is less than 4.
4. The corona resistant plastic matrix composite of claim 1, wherein said modified reinforcement material further comprises inorganic nanoparticles.
5. The corona resistant plastic-based composite of claim 4, wherein said inorganic nanoparticles comprise at least one of silica, aluminum oxide, boron nitride, aluminum nitride, and titanium dioxide; the particle size of the inorganic nano particles is 10-800nm.
6. The corona resistant plastic-based composite of claim 5, wherein the mica flakes are present in an amount of 10% to 60% and the inorganic nanoparticles are present in an amount of 5% to 30%.
7. The corona resistant plastic-based composite of claim 1, wherein said modified reinforcement material further comprises insulating fibers resistant to high temperatures above 180 ℃; the insulating fiber comprises at least one of chopped glass fiber and precipitated meta-aramid fiber;
in the corona-resistant plastic-based composite material, the content of the insulating fiber is 5% -30%.
8. A method of producing a corona resistant plastic matrix composite according to any one of claims 1 to 7, wherein said matrix plastic and said modified reinforcement material in particulate and/or powder form are mixed together to form a mixed material, and said mixed material is produced into said corona resistant plastic matrix composite by any one of continuous hot pressing, extrusion molding, sinter molding and blow molding.
9. A corona resistant composite sheet comprising a corona resistant layer and an aramid fiber layer, characterized in that the corona resistant layer is the corona resistant plastic-based composite material of any one of claims 1-7 or the corona resistant plastic-based composite material prepared by the preparation method of claim 8;
the aramid fiber layer is attached to at least one surface of the corona resistant layer.
10. An electric motor stator for an electrically driven vehicle, characterized in that a corona resistant plastic-based composite material according to any one of claims 1 to 7 or a corona resistant plastic-based composite material produced by the production method according to claim 8, or is provided in the slots and/or at intervals of the electric motor stator
The corona resistant composite sheet of claim 9 disposed within and/or spaced from the slots of the motor stator.
CN202310037057.8A 2023-01-10 2023-01-10 Corona-resistant plastic-based composite material, preparation method thereof, corona-resistant composite sheet and motor stator Pending CN116144128A (en)

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