C-grade oil-resistant groove insulating composite material for automobile driving motor and preparation method of C-grade oil-resistant groove insulating composite material

Abstract

The invention discloses a C-grade oil-resistant groove insulating composite material for an automobile driving motor and a preparation method of the C-grade oil-resistant groove insulating composite material. The C-grade oil-groove-resistant insulating composite material for the automobile driving motor is characterized by being formed by sequentially compounding an aromatic polyamide fiber paper layer, a high-heat-resistance and high-barrier-property adhesive layer, a polyimide film layer, a high-heat-resistance and high-barrier-property adhesive layer and an aromatic polyamide fiber paper layer, the adhesive with high heat resistance and high barrier property is prepared by mixing 100 parts by mass of polyurethane resin, 30-40 parts by mass of rubber resin and 5-10 parts by mass of a solvent. The C-grade oil-resistant groove insulation composite material for the automobile driving motor has good oil resistance, heat resistance and processability, is especially suitable for groove insulation of oil-cooled driving motors of new energy automobiles such as electric automobiles, and is also suitable for phase insulation and turn-to-turn insulation of the oil-cooled driving motors of the new energy automobiles such as the electric automobiles.

Description

Technical Field

[0001] The present invention belongs to composite materials and their preparation, and relates to a C-class oil-resistant groove insulation composite material for automobile drive motors and a preparation method thereof. The C-class oil-resistant groove insulation composite material for automobile drive motors of the present invention (prepared) is particularly suitable for the groove insulation of oil-cooled drive motors of new energy vehicles such as electric vehicles, and is also suitable for phase insulation and turn-to-turn insulation of oil-cooled drive motors of new energy vehicles such as electric vehicles. Background Art

[0002] With the rapid development of new energy vehicles, the technology of drive motors is changing with each passing day. Its integration, oil cooling, high power and high voltage have become the future development trend. The continuous development of drive motors has put forward higher requirements for insulation materials, among which slot insulation paper mainly has high temperature resistance, oil resistance, high voltage level and easy processing and molding. In the existing technology, pure aramid paper or traditional composite materials are mainly used. Pure aramid paper has good oil resistance and temperature resistance, but the single-layer integrated paper structure has a high risk of cracking after bending and molding during use. Once there is a cracking problem, the motor will have a short circuit risk. During use, problems such as chip drop and slot jam cannot be fundamentally solved, polluting the production environment and motor cleanliness, and ultimately affecting production efficiency. The key is that its voltage level is low and does not meet the development trend of high voltage motors. Traditional composite materials are generally "polynaphthyl ester film double-sided composite polyaramid fiber paper composite materials". The composite material has a high voltage level and is easy to form and process, but its temperature resistance is insufficient, the oil resistance adaptability range is narrow, the performance decay is large in some oil products, and the reliability is insufficient.

[0003] In the prior art, CN114672259A discloses "an oil-resistant composite material for automotive drive motors, its preparation method and use", all substrates are "polyethylene naphthalate (PEN) film", "acrylic oil-resistant adhesive", "polyaramid fiber paper", and since the heat resistance grade of the PEN film is F grade, the heat resistance level of the product itself is relatively low. During the "oil resistance" and "heat resistance" tests, it will quickly become hard and brittle. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art and provide a C-class oil-resistant groove insulation composite material for automotive drive motors and a preparation method thereof. Thus, a C-class oil-resistant groove insulation composite material for automotive drive motors (especially oil-cooled drive motors of new energy vehicles such as electric vehicles) with good oil resistance, heat resistance and processing performance and a preparation method thereof are provided.

[0005] The present invention provides a C-class oil-resistant groove insulation composite material for automobile drive motors, characterized in that the C-class oil-resistant groove insulation composite material for automobile drive motors is composed of a polyaramid fiber paper layer (1), a high heat-resistant and high-barrier adhesive layer (2), a polyimide film layer (3), a high heat-resistant and high-barrier adhesive layer (4), and a polyaramid fiber paper layer (5) in sequence;

[0006] The high heat-resistant and high barrier adhesive layer is formed by coating a high heat-resistant and high barrier adhesive on the polyimide film layer (3) and baking the high heat-resistant and high barrier adhesive, wherein the high heat-resistant and high barrier adhesive is composed of a mixture of 100 parts by mass of a polyurethane resin, 30 to 40 parts by mass of a rubber resin and 5 to 10 parts by mass of a solvent;

[0007] The polyaramid fiber paper layer 1 is polyaramid fiber paper;

[0008] The polyimide film layer 3 is a polyimide film.

[0009] In the content of the present invention: the rubber resin is one or a mixture of two or more of styrene-butadiene rubber (produced by: Donghua Energy (Ningbo) New Materials Co., Ltd., Beijing Petroleum, Liaoning North Dynaso Synthetic Rubber Co., Ltd., Oriental Chemical, etc., the same below), nitrile rubber (produced by: Shanghai Xiangxing Industrial Co., Ltd., Xingtai Xinfangda Sealing Co., Ltd., Dongguan Haoxin Chemical Co., Ltd., etc., the same below), ethylene-propylene rubber (produced by: Sinopec Mitsui, Jilin Petrochemical, Alangxinco Changzhou Co., Ltd., Ningbo Aiskai Synthetic Rubber, etc., the same below), and chloroprene rubber (produced by: Henkel Black & Decker, Huitian Rubber Industry, Bostik, etc., the same below).

[0010] The solvent is one of acetone, methyl acetate, alcohol (ie ethanol) or a mixture of two of them.

[0011] The polyurethane resin is a commercially available chemical product (produced and provided by HenKel, Bostik, etc.).

[0012] In the content of the present invention: the polyimide film is preferably a biaxially stretched polyimide film (the production and supply companies of the biaxially stretched polyimide film products are: DuPont, with a thickness of 0.1 mm).

[0013] In the content of the present invention: the thickness of the polyaramid fiber paper is 0.05mm (the production and provision companies of polyaramid fiber paper products include: DuPont Trading (Shanghai) Co., Ltd., Yantai Minshida Special Paper Co., Ltd., Chaomeis New Materials Co., Ltd., Zhuzhou Times Huaxian Technology Co., Ltd., etc., the same below).

[0014] Another aspect of the present invention is: a method for preparing a C-class oil-resistant groove insulation composite material for automobile drive motors, characterized in that the steps are:

[0015] a. Preparation of high heat-resistant and high barrier adhesive:

[0016] Take polyurethane resin, rubber resin and solvent according to the mass ratio of 100 parts by mass of polyurethane resin, 30-40 parts by mass of rubber resin and 5-10 parts by mass of solvent; mix the rubber resin and solvent evenly, then add the polyurethane resin and stir and mix evenly, so as to prepare a high heat-resistant and high-barrier adhesive (solution);

[0017] b. Preparation of Class C oil-resistant groove insulation composite materials for automotive drive motors:

[0018] On a soft composite material production device (preferably a soft composite material production device with single-sided comma scraper coating), the vehicle speed is controlled at 9-10 m / min, and first, one surface of the polyimide film [i.e., the polyimide film layer (3)] is coated with the high heat-resistant and high-barrier adhesive (solution) obtained in step a (preferably by a comma scraper), and then the film is placed in a drying oven for baking. The drying oven is 30 m long and is divided into five sections: the first section has a temperature of 105° C. to 115° C., the second section has a temperature of 130° C. to 140° C., and the third section has a temperature of The temperature of the first stage is 135°C to 145°C, the temperature of the fourth stage is 130°C to 140°C, and the temperature of the fifth stage is 125°C to 135°C; after baking, a polyimide film having a high heat-resistant and high-barrier adhesive layer (2) on one side is obtained, and then a layer of polyaramid fiber paper [i.e., polyaramid fiber paper layer (1)] is bonded to the surface of the high heat-resistant and high-barrier adhesive layer (2), and after rolling, it is placed in a drying room at 20°C to 40°C for baking for 24h to 36h, and then transferred to a drying room at 65 to 75°C for treatment for 60h to 72h (after completion of curing treatment), to obtain The semi-finished product; and then the other surface of the semi-finished polyimide film [i.e., the polyimide film layer (3)] is coated with the high heat-resistant and high-barrier adhesive (solution) obtained in step a (preferably by a comma scraper), and then enters a drying tunnel for baking. The drying tunnel is 30 m long and is divided into five sections: the first section has a temperature of 105°C to 115°C, the second section has a temperature of 130°C to 140°C, the third section has a temperature of 135°C to 145°C, the fourth section has a temperature of 130°C to 140°C, and the fifth section has a temperature of 125°C to 135°C. After baking, Finally, a polyimide film having a high heat-resistant and high-barrier adhesive layer (2) on one side and a high heat-resistant and high-barrier adhesive layer (4) on the other side is obtained. A layer of polyaramid fiber paper [i.e., polyaramid fiber paper layer (5)] is bonded and laminated to the high heat-resistant and high-barrier adhesive layer (4). After being rolled up, the film is placed in a drying oven at 20°C to 40°C for baking for 24h to 36h, and then transferred to a drying oven at 65°C to 75°C for treatment for 60h to 72h (after completion of the post-curing treatment), thereby obtaining a Class C oil-resistant groove insulation composite material (finished product) for automotive drive motors.

[0019] In another aspect of the present invention: the rubber resin in step a is one or a mixture of two or more of styrene-butadiene rubber, nitrile rubber, ethylene-propylene rubber, and chloroprene rubber;

[0020] The solvent is one of acetone, methyl acetate, alcohol (ie ethanol) or a mixture of two of them.

[0021] The polyurethane resin is a commercially available chemical product (produced and provided by: HenKel, Bostik, etc.).

[0022] In another aspect of the present invention: the polyimide film in step b is preferably a biaxially stretched polyimide film (the production and supply companies of biaxially stretched polyimide film products include: DuPont, with a thickness of 0.1 mm).

[0023] Another aspect of the present invention is characterized in that the thickness of the polyaramid fiber paper in step b is 0.05 mm.

[0024] In another aspect of the present invention: the total thickness of the high heat-resistant and high-barrier adhesive layer (2) and the high heat-resistant and high-barrier adhesive layer (4) is 0.037 mm to 0.05 mm.

[0025] Compared with the prior art, the present invention has the following characteristics and beneficial effects:

[0026] (1) According to the present invention, a high-barrier rubber resin having a relatively high content is added to the high-heat-resistant and high-barrier adhesive, which can effectively block the damage of oil and water molecules, etc., and can effectively prevent oxygen aging at high temperatures, thereby improving the heat resistance of the composite material;

[0027] (2) By adopting the present invention, the polyurethane resin has good adhesion and heat resistance, and can ensure the adhesion of multi-layer quality inspection materials under high and low temperature environments in actual applications without debonding;

[0028] (3) By adopting the present invention, the polyimide film has excellent heat resistance, which can provide a guarantee for the heat resistance of the product;

[0029] (4)) According to the present invention, the polyaramid fiber paper has excellent heat resistance and a loose surface structure, which can be fully infiltrated with resin during the dipping or dripping process of the motor manufacturing and bonded with the electromagnetic wire;

[0030] (5) The present invention breaks the idea that the adhesive content in the composite material in the prior art is small (total thickness 0.01mm-0.02mm). By increasing the content and thickness of the high heat-resistant and high barrier adhesive (thickness 0.037mm-0.05mm), the high heat-resistant and high barrier adhesive forms a film on the surface of the polyimide film, which effectively blocks the corrosion of oil and water molecules on the product. The high coating amount and the step curing process allow the high heat-resistant and high barrier adhesive to fully fill the gaps in the polyaramid fiber paper, thereby improving the oil resistance of the C-level oil-resistant groove insulation composite material for automotive drive motors.

[0031] (6) The preparation process of the product of the present invention is simple, the process is simple, and the practicability is strong; the C-class oil-resistant groove insulation composite material for automobile drive motors prepared by the present invention has good oil resistance, heat resistance and processability, and is particularly suitable for oil-cooled drive motor slot insulation of new energy vehicles such as electric vehicles, and is also suitable for phase insulation and turn-to-turn insulation of oil-cooled drive motors of new energy vehicles such as electric vehicles; after testing, the performance test results of the C-class oil-resistant groove insulation composite material product for automobile drive motors prepared by the present invention are shown in Table 1 below:

[0032] Table 1: Product performance test results:

[0033] Test Project unit Test conditions Product of the present invention Appearance － — No wrinkles or other defects on the surface thickness mm — 0.24 Tensile Strength N / 10mm － 200 Breakdown voltage kV － 150 Temperature resistance level class － C Oil resistance —— — Compliant with T / CEEIA 415-2023 BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the longitudinal cross-sectional structure of the C-class oil-resistant groove insulation composite material for automobile drive motors of the present invention and embodiments;

[0035] In the figure: 1-polyaramid fiber paper layer, 2-high heat-resistant and high-barrier adhesive layer, 3-polyimide film layer, 4-high heat-resistant and high-barrier adhesive layer, 5-polyaramid fiber paper layer. DETAILED DESCRIPTION

[0036] The embodiments given below are intended to further illustrate the present invention, but should not be construed as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made to the present invention by technicians in this field based on the above-mentioned contents of the present invention still fall within the scope of protection of the present invention.

[0037] Embodiments 1 to 10:

[0038] A method for preparing a C-class oil-resistant groove insulation composite material for an automobile drive motor, comprising the following steps:

[0039] a. Preparation of high heat-resistant and high barrier adhesive:

[0040] Take polyurethane resin, rubber resin and solvent according to the mass ratio of 100 parts by mass of polyurethane resin, 30-40 parts by mass of rubber resin and 5-10 parts by mass of solvent; mix the rubber resin and solvent evenly, then add the polyurethane resin and stir and mix evenly, so as to prepare a high heat-resistant and high-barrier adhesive (solution);

[0041] The rubber resin is one or a mixture of two or more of styrene-butadiene rubber, nitrile rubber, ethylene-propylene rubber and chloroprene rubber;

[0042] The solvent is one or a mixture of two of acetone, methyl acetate, and alcohol (i.e., ethanol);

[0043] The polyurethane resin is a commercially available chemical product (produced by HenKel);

[0044] The polyimide film is a biaxially stretched polyimide film (the biaxially stretched polyimide film product is produced and provided by DuPont, with a thickness of 0.1 mm);

[0045] The thickness of the polyaramid fiber paper is 0.05 mm (the polyaramid fiber paper product is produced and provided by DuPont Trading (Shanghai) Co., Ltd.).

[0046] The specific raw material components and weight percentages (unit: kilogram) used in preparing the high heat-resistant and high barrier adhesive of each embodiment are shown in Tables 2-1 and 2-2 below:

[0047] Table 2-1: Preparation of high heat-resistant and high barrier adhesive (the parts in the table are all parts by mass, unit: kg):

[0048]

[0049] Table 2-1: Preparation of high heat-resistant and high barrier adhesive (the parts in the table are all parts by mass, unit: kg):

[0050]

[0051] Note: The “adhesive” in Tables 2-1 and 2-2 refers to “high heat-resistant and high barrier adhesive”.

[0052] b. Preparation of Class C oil-resistant groove insulation composite materials for automotive drive motors:

[0053] On the soft composite material production equipment (a soft composite material production equipment with single-sided comma scraper coating), the vehicle speed is controlled at 9-10 m / min, firstly, one surface of the polyimide film (i.e., the polyimide film layer 3) is coated with the high heat-resistant and high-barrier adhesive (solution) prepared in step a by a comma scraper, and then enters the drying tunnel for baking. The drying tunnel is 30 m long and is divided into five sections: the first section has a temperature of 105°C to 115°C, the second section has a temperature of 130°C to 140°C, the third section has a temperature of 13 The temperature of the first stage is 5℃~145℃, the temperature of the fourth stage is 130℃~140℃, and the temperature of the fifth stage is 125℃~135℃; after baking, a polyimide film with a high heat-resistant and high-barrier adhesive layer 2 on one side is obtained, and then a layer of polyaramid fiber paper (i.e., polyaramid fiber paper layer 1) is bonded to the second side of the high heat-resistant and high-barrier adhesive layer, and after rolling, it is placed in a drying room at 20℃~40℃ for baking for 24h~36h, and then transferred to a drying room at 65~75℃ for treatment for 60h~72h (after completion of curing treatment), to obtain Semi-finished product; and then the other surface of the semi-finished polyimide film (i.e., the polyimide film layer 3) is coated with the high heat-resistant and high-barrier adhesive (solution) prepared in step a by a comma scraper, and then enters a drying tunnel for baking. The drying tunnel is 30m long and is divided into five sections: the temperature of the first section is 105°C to 115°C, the temperature of the second section is 130°C to 140°C, the temperature of the third section is 135°C to 145°C, the temperature of the fourth section is 130°C to 140°C, and the temperature of the fifth section is 125°C to 135°C. After baking Finally, a polyimide film with a high heat-resistant and high-barrier adhesive layer 2 on one side and a high heat-resistant and high-barrier adhesive layer 4 on the other side is obtained, and then a layer of polyaramid fiber paper (i.e., polyaramid fiber paper layer 5) is bonded to the high heat-resistant and high-barrier adhesive layer 4. After being rolled up, it is placed in a drying room at 20°C to 40°C for baking for 24h to 36h, and then transferred to a drying room at 65 to 75°C for treatment for 60h to 72h (after completion of post-curing treatment), and a C-grade oil-resistant groove insulation composite material (finished product) for automotive drive motors is obtained.

[0054] In each of Examples 1 to 10: the specific process parameters of the "vehicle speed" and the 1 to 5 temperature, the amount of glue, etc. in the step b of preparing the C-grade oil-resistant groove insulation composite material for automobile drive motors and the key performance indicators of the obtained products are shown in Tables 3-1 and 3-2 below:

[0055] Table 3-1: Specific process parameters and key performance indicators of the product for preparing Class C oil-resistant groove insulation composite material for automobile drive motor in step b of Examples 1 to 5:

[0056]

[0057]

[0058] Table 3-2: Specific process parameters and key performance indicators of the product for preparing Class C oil-resistant groove insulation composite material for automobile drive motor in step b of Examples 6 to 10:

[0059]

[0060] Embodiment 11:

[0061] A C-class oil-resistant groove insulation composite material for automobile drive motors, characterized in that: the C-class oil-resistant groove insulation composite material for automobile drive motors is composed of a polyaramid fiber paper layer 1, a high heat-resistant and high-barrier adhesive layer 2, a polyimide film layer 3, a high heat-resistant and high-barrier adhesive layer 4, and a polyaramid fiber paper layer 5 in sequence;

[0062] The high heat-resistant and high barrier adhesive layer is formed by coating the high heat-resistant and high barrier adhesive on the polyimide film layer 3 and baking the high heat-resistant and high barrier adhesive, wherein the high heat-resistant and high barrier adhesive is composed of 100 parts by mass of a polyurethane resin, 35 parts by mass of a rubber resin and 7.5 parts by mass of a solvent;

[0063] The polyaramid fiber paper layer 1 is polyaramid fiber paper; the polyimide film layer 3 is polyimide film.

[0064] Embodiment 12:

[0065] A C-class oil-resistant groove insulation composite material for automobile drive motors, characterized in that: the C-class oil-resistant groove insulation composite material for automobile drive motors is composed of a polyaramid fiber paper layer 1, a high heat-resistant and high-barrier adhesive layer 2, a polyimide film layer 3, a high heat-resistant and high-barrier adhesive layer 4, and a polyaramid fiber paper layer 5 in sequence;

[0066] The high heat-resistant and high barrier adhesive layer is formed by coating the high heat-resistant and high barrier adhesive on the polyimide film layer 3 and baking the high heat-resistant and high barrier adhesive, wherein the high heat-resistant and high barrier adhesive is composed of a mixture of 100 parts by mass of a polyurethane resin, 30 parts by mass of a rubber resin and 5 parts by mass of a solvent;

[0067] The polyaramid fiber paper layer 1 is polyaramid fiber paper; the polyimide film layer 3 is polyimide film.

[0068] Embodiment 13:

[0069] A C-class oil-resistant groove insulation composite material for automobile drive motors, characterized in that: the C-class oil-resistant groove insulation composite material for automobile drive motors is composed of a polyaramid fiber paper layer 1, a high heat-resistant and high-barrier adhesive layer 2, a polyimide film layer 3, a high heat-resistant and high-barrier adhesive layer 4, and a polyaramid fiber paper layer 5 in sequence;

[0070] The high heat-resistant and high barrier adhesive layer is formed by coating the high heat-resistant and high barrier adhesive on the polyimide film layer 3 and baking the high heat-resistant and high barrier adhesive, wherein the high heat-resistant and high barrier adhesive is composed of a mixture of 100 parts by mass of a polyurethane resin, 40 parts by mass of a rubber resin and 10 parts by mass of a solvent;

[0071] The polyaramid fiber paper layer 1 is polyaramid fiber paper; the polyimide film layer 3 is polyimide film.

[0072] In the above-mentioned embodiments 11-13:

[0073] The rubber resin is one or a mixture of two or more of styrene-butadiene rubber, nitrile rubber, ethylene-propylene rubber and chloroprene rubber;

[0074] The solvent is one of acetone, methyl acetate, alcohol (ie ethanol) or a mixture of two of them.

[0075] The polyurethane resin is a commercially available chemical product (produced by HenKel, Bostik, etc.);

[0076] The polyimide film is preferably a biaxially stretched polyimide film (the production and supply companies of biaxially stretched polyimide film products include: DuPont, with a thickness of 0.1 mm);

[0077] The thickness of the polyaramid fiber paper is 0.05 mm (the manufacturers of polyaramid fiber paper products include: DuPont Trading (Shanghai) Co., Ltd., Yantai Minshida Special Paper Co., Ltd., Chaomeis New Materials Co., Ltd., and Zhuzhou Times Huaxian Technology Co., Ltd.);

[0078] The total thickness of the high heat-resistant and high-barrier adhesive layer 2 and the high heat-resistant and high-barrier adhesive layer 4 is one of 0.037 mm to 0.05 mm.

[0079] In the above embodiments: the percentages used, unless otherwise specified, are all mass (weight) percentages or percentages known to those skilled in the art; the proportions used, unless otherwise specified, are all mass (weight) proportions; and the weights may be in grams or kilograms.

[0080] In the above embodiments, the process parameters (temperature, time, speed, etc.) in each step and the numerical values ​​of the amounts of each component are ranges, and any point can be applied.

[0081] The technical contents not specifically described in the present invention and the above embodiments are the same as the prior art, and the raw materials are all commercially available products.

[0082] The present invention is not limited to the above embodiments, and all of the contents of the present invention can be implemented and have the above good effects.

Claims

1. A C-class oil-resistant groove insulation composite material for automobile drive motors, characterized by: The C-class oil-resistant groove insulation composite material for automobile drive motors is composed of a polyaramid fiber paper layer (1), a high heat-resistant and high-barrier adhesive layer (2), a polyimide film layer (3), a high heat-resistant and high-barrier adhesive layer (4), and a polyaramid fiber paper layer (5). The high heat-resistant and high barrier adhesive layer is formed by coating a high heat-resistant and high barrier adhesive on the polyimide film layer (3) and baking the high heat-resistant and high barrier adhesive, wherein the high heat-resistant and high barrier adhesive is composed of a mixture of 100 parts by mass of a polyurethane resin, 30 to 40 parts by mass of a rubber resin and 5 to 10 parts by mass of a solvent; The polyaramid fiber paper layer (1) is polyaramid fiber paper; The polyimide film layer (3) is a polyimide film.

2. The C-class oil-resistant groove insulation composite material for automobile drive motor according to claim 1, characterized in that: The rubber resin is one or a mixture of two or more of styrene-butadiene rubber, nitrile rubber, ethylene-propylene rubber and chloroprene rubber; The solvent is one of acetone, methyl acetate and alcohol or a mixture of two of them.

3. The C-class oil-resistant groove insulation composite material for automobile drive motor according to claim 1 or 2, characterized in that: The polyimide film is a biaxially stretched polyimide film.

4. The C-class oil-resistant groove insulation composite material for automobile drive motor according to claim 1 or 2, characterized in that: The thickness of the polyaramid fiber paper is 0.05 mm.

5. A method for preparing a Class C oil-resistant groove insulation composite material for automobile drive motors, characterized in that The steps are: a. Preparation of high heat-resistant and high barrier adhesive: Take polyurethane resin, rubber resin and solvent according to the mass ratio of 100 parts by mass of polyurethane resin, 30-40 parts by mass of rubber resin and 5-10 parts by mass of solvent; mix the rubber resin and solvent evenly, then add the polyurethane resin and stir and mix evenly to obtain a high heat-resistant and high-barrier adhesive; b. Preparation of Class C oil-resistant groove insulation composite materials for automotive drive motors: On the soft composite material production equipment, the vehicle speed is controlled at 9-10 m / min, firstly, a surface of the polyimide film is coated with the high heat-resistant and high barrier adhesive prepared in step a, and then the film is placed in a drying oven for baking, the drying oven length is 30 m and is divided into five sections: the temperature of the first section is 105°C-115°C, the temperature of the second section is 130°C-140°C, the temperature of the third section is 135°C-145°C, the temperature of the fourth section is 130°C-140°C, and the temperature of the fifth section is 125°C-135°C; after baking, a polyimide film having a high heat-resistant and high barrier adhesive layer (2) on one side is obtained, and then a layer of polyaramid fiber paper is bonded to the surface of the high heat-resistant and high barrier adhesive layer (2), and after rolling, the film is placed in a drying oven at 20°C-40°C for baking for 24h-36h, and then transferred to a drying oven at 65-75°C for treatment for 60h-72h to obtain a semi-finished product; and then the semi-finished product is placed in a drying oven at 65-75°C for baking for 60h-72h to obtain a semi-finished product. The other surface of the polyimide film is coated with the high heat-resistant and high barrier adhesive prepared in step a, and then the film is put into a drying oven for baking. The drying oven is 30 m long and is divided into five sections: the first section has a temperature of 105°C to 115°C, the second section has a temperature of 130°C to 140°C, the third section has a temperature of 135°C to 145°C, the fourth section has a temperature of 130°C to 140°C, and the fifth section has a temperature of 125°C to 135°C. After baking, a polyimide film having a high heat-resistant and high barrier adhesive layer (2) on one side and a high heat-resistant and high barrier adhesive layer (4) on the other side is obtained. The high heat-resistant and high barrier adhesive layer (4) is then bonded and laminated with a layer of polyaramid fiber paper. After being rolled up, the film is placed in a drying oven at 20°C to 40°C for baking for 24h to 36h, and then transferred to a drying oven at 65 to 75°C for treatment for 60h to 72h, thereby obtaining a Class C oil-resistant groove insulation composite material for automotive drive motors.

6. The method for preparing the C-grade oil-resistant groove insulation composite material for automobile drive motor according to claim 5, characterized in that: The rubber resin in step a is one or a mixture of two or more of styrene-butadiene rubber, nitrile rubber, ethylene-propylene rubber and chloroprene rubber; The solvent is one of acetone, methyl acetate and alcohol or a mixture of two of them.

7. The method for preparing the C-grade oil-resistant groove insulation composite material for automobile drive motor according to claim 5 or 6, characterized in that: The specific steps of preparing the C-grade oil-resistant groove insulation composite material for automobile drive motors described in step b are: on a soft composite material production equipment with a single-sided comma scraper coating, the vehicle speed is controlled at 9m / min, firstly, one surface of the polyimide film is coated with the high heat-resistant and high-barrier adhesive prepared in step a by a comma scraper, and then the film is put into a drying oven for baking. The drying oven is 30m long and divided into five sections: the temperature of the first section is 105°C to 115°C, the temperature of the second section is 130 ℃~140℃, the temperature of the third stage is 135℃~145℃, the temperature of the fourth stage is 130℃~140℃, and the temperature of the fifth stage is 125℃~135℃; after baking, a polyimide film with a high heat-resistant and high-barrier adhesive layer (2) on one side is obtained, and then a layer of polyaramid fiber paper is bonded to the high heat-resistant and high-barrier adhesive layer (2), and after rolling, it is placed in a drying room at 20℃~40℃ for baking for 24h~36h, and then transferred to a drying room at 65~75℃ for treatment for 6h 0h~72h, a semi-finished product is obtained; then the other surface of the semi-finished polyimide film is coated with the high heat-resistant and high-barrier adhesive obtained in step a by a comma scraper, and then enters a drying tunnel for baking. The drying tunnel is 30m long and is divided into five sections: the first section has a temperature of 105℃~115℃, the second section has a temperature of 130℃~140℃, the third section has a temperature of 135℃~145℃, the fourth section has a temperature of 130℃~140℃, the fifth section has a temperature of 125℃~1 35°C, after baking, a polyimide film having a high heat-resistant and high-barrier adhesive layer (2) on one side and a high heat-resistant and high-barrier adhesive layer (4) on the other side is obtained, and then a layer of polyaramid fiber paper is bonded to the high heat-resistant and high-barrier adhesive layer (4) surface, and after rolling, it is placed in a drying room at 20°C to 40°C for baking for 24h to 36h, and then transferred to a drying room at 65 to 75°C for treatment for 60h to 72h, so as to obtain a C-level oil-resistant groove insulation composite material for automotive drive motors.

8. The method for preparing the C-grade oil-resistant groove insulation composite material for automobile drive motor according to claim 5 or 6, characterized in that: The polyimide film in step b is a biaxially stretched polyimide film.

9. The method for preparing the C-grade oil-resistant groove insulation composite material for automobile drive motor according to claim 5 or 6, characterized in that: The thickness of the polyaramid fiber paper in step b is 0.05 mm.

10. The method for preparing the C-grade oil-resistant groove insulation composite material for automobile drive motor according to claim 5 or 6, characterized in that: The total thickness of the high heat-resistant and high-barrier adhesive layer (2) and the high heat-resistant and high-barrier adhesive layer (4) is 0.037 mm to 0.05 mm.

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