Composite insulation paper, card issuing motor and vehicle

Abstract

The utility model relates to composite insulation paper, a card issuing motor and a vehicle, and the composite insulation paper comprises a first paper layer, a first composite adhesive layer, a polyester film layer, a second composite adhesive layer and a second paper layer, a reinforced adhesive layer is arranged between the first composite adhesive layer and the polyester film layer and / or between the second composite adhesive layer and the polyester film layer. According to the composite insulation paper, the reinforcing adhesive layer is arranged in the adhesive layer of the composite insulation paper, so that the overall strength of the adhesive layer can be improved, the elongation at break and the tearing strength of the composite insulation paper are improved, and the problem of cracking of the composite insulation paper during card twisting is solved.

Description

Technical Field

[0001] This application relates to the field of insulating paper technology, and more particularly to a composite insulating paper, a hairpin motor, and a vehicle. Background Technology

[0002] Oil-cooled hairpin motors, due to their requirements for oil and temperature resistance, extensively use APA (Aramid Paper-Aramid Fiber Composite Insulation Paper) or NPN (Nomex-Polyester-Nomex) insulating paper. This type of insulating paper has a five-layer structure, consisting of: aramid paper - composite adhesive - PEN film (polyethylene naphthalate film) - composite adhesive - aramid paper. The composite adhesive is used to adhere two layers of aramid paper to both sides of the PEN film.

[0003] This type of insulating paper needs to meet the requirements of high temperature resistance and oil resistance. To meet assembly requirements, it also needs high strength and good flexibility (low stiffness). Therefore, the composite adhesive used is relatively soft and has low strength, aiming to achieve good adhesion and oil barrier properties (protecting the PEN film). The aramid paper layer mainly provides good insulation and paint adhesion, but its strength is relatively weak. Therefore, the mechanical properties of this type of insulating paper are provided by the PEN film. However, the elongation at break and tear strength of the PEN film are slightly insufficient, leading to cracking during the twisting and clamping process in the motor stator assembly. Utility Model Content

[0004] This application provides a composite insulating paper, a hairpin motor, and a vehicle, which improves the elongation at break and tear resistance of the composite insulating paper, thereby at least partially solving the above-mentioned technical problems.

[0005] To achieve the above objectives, according to a first aspect of this application, a composite insulating paper is provided, comprising a first paper layer, a first composite adhesive layer, a polyester film layer, a second composite adhesive layer, and a second paper layer stacked sequentially, wherein a reinforcing adhesive layer is provided between the first composite adhesive layer and the polyester film layer and / or between the second composite adhesive layer and the polyester film layer.

[0006] Optionally, the reinforcing adhesive layer (6) is disposed between the first composite adhesive layer (2) and the polyester film layer (3) and / or between the second composite adhesive layer (4) and the polyester film layer (3), wherein the total thickness of the reinforcing adhesive layer (6) is in the ratio of (1~2):1 to the thickness of the first composite adhesive layer (2), and / or the total thickness of the reinforcing adhesive layer (6) is in the ratio of (1~2):1 to the thickness of the second composite adhesive layer (4).

[0007] Optionally, the reinforcing adhesive layer (6) is disposed between the first composite adhesive layer (2) and the polyester film layer (3) and / or between the second composite adhesive layer (4) and the polyester film layer (3), and the total thickness of the reinforcing adhesive layer (6) is 20-40 micrometers.

[0008] Optionally, the thickness of the reinforcing adhesive layer between the second composite adhesive layer and the polyester film layer.

[0009] Optionally, the tear strength of the reinforcing adhesive layer is 400-1000 N / 20 mm.

[0010] Optionally, the toughness parameter of the reinforcing adhesive layer is an elongation at break of 50-200%.

[0011] Optionally, the first paper layer includes an aramid paper layer.

[0012] Optionally, the second paper layer comprises an aramid paper layer.

[0013] Optionally, the polyester film layer includes a polyethylene naphthalate film layer.

[0014] Optionally, the reinforcing adhesive layer includes at least one of an epoxy resin layer, a polyacrylic resin layer, a phenoxy resin layer, and a mixed layer formed of at least two of epoxy resin, polyacrylic resin, and phenoxy resin.

[0015] Optionally, the epoxy resin layer comprises epoxy resin, curing agent, inorganic nanofiller, and solvent; the epoxy resin comprises one or more of bisphenol A epoxy resin, bisphenol F epoxy resin, and rubber-modified epoxy resin; and the curing agent comprises one or more of polyamide curing agents and anhydride curing agents; and / or

[0016] The polyacrylic resin layer comprises polyacrylic resin, curing agent, inorganic nanofiller, and solvent; the polyacrylic resin includes hydroxyl acrylate resin; and the curing agent includes one or more of amino resin curing agents and isocyanate curing agents; and / or

[0017] The phenoxy resin layer is made of phenoxy resin, curing agent, inorganic nanofiller and solvent, wherein the phenoxy resin and the curing agent include one or more of amino resin curing agents and isocyanate curing agents.

[0018] Optionally, the first composite adhesive layer includes at least one of an epoxy resin layer, a polyacrylate resin layer, or a mixture of epoxy resin and polyacrylate resin, and the glass transition temperature of the second composite adhesive layer is ≤20°C.

[0019] Optionally, the second composite adhesive layer includes at least one of an epoxy resin layer, a polyacrylate resin layer, or a mixture of epoxy resin and polyacrylate resin, and the glass transition temperature of the second composite adhesive layer is ≤20°C.

[0020] Optionally, the glass transition temperature of the first composite adhesive layer is 0~10℃.

[0021] Optionally, the glass transition temperature of the second composite adhesive layer is 0~10℃.

[0022] Optionally, the epoxy resin layer comprises epoxy resin, toughening agent, curing agent, and solvent; the epoxy resin comprises one or more of bisphenol A epoxy resin, bisphenol F epoxy resin, and rubber-modified epoxy resin; the toughening agent comprises a hydroxyl acrylate resin with a glass transition temperature of -30 to 10°C; and the curing agent comprises one or more of polyamide curing agents and acid anhydride curing agents; and / or

[0023] The material of the polyacrylate resin layer includes polyacrylate resin, curing agent and solvent. The polyacrylate resin includes hydroxyl acrylate resin with a glass transition temperature of -30~10℃. The curing agent includes one or more of amino resin curing agents and isocyanate curing agents.

[0024] According to a second aspect of this application, a hairpin motor is provided, comprising the aforementioned composite insulating paper.

[0025] According to a third aspect of this application, a vehicle is provided, including the aforementioned card-issuing motor.

[0026] In the composite insulating paper of this application embodiment, by providing a reinforcing adhesive layer in the adhesive layer of the composite insulating paper, the overall strength of the adhesive layer can be improved, thereby improving the strength of the insulating paper, improving the elongation at break and tear resistance of the composite insulating paper, and thus solving the cracking problem that exists when twisting hair clips.

[0027] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0030] Figure 1 This is a schematic diagram of the structure of the composite insulating paper provided in an exemplary embodiment of this application. Figure 1 ;

[0031] Figure 2 This is a schematic diagram of the structure of the composite insulating paper provided in an exemplary embodiment of this application. Figure 2 ;

[0032] Figure 3 This is a schematic diagram of the structure of the composite insulating paper provided in an exemplary embodiment of this application. Figure 3 ;

[0033] Figure 4 This is a schematic diagram of the structure of the composite insulating paper provided in an exemplary embodiment of this application. Figure 4 ;

[0034] Figure 5 This is a schematic diagram of the structure of the composite insulating paper provided in an exemplary embodiment of this application. Figure 5 .

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. First paper layer; 2. First composite adhesive layer; 3. Polyester film layer; 4. Second composite adhesive layer; 5. Second paper layer; 6. Reinforcing adhesive layer. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0038] According to a first aspect of this application, this application provides a composite insulating paper, please refer to... Figures 1-3 , Figure 1 A schematic diagram of the structure of the composite insulating paper provided in the embodiments of this application. Figure 1 .

[0039] The composite insulating paper includes a first paper layer 1, a first composite adhesive layer 2, a polyester film layer 3, a second composite adhesive layer 4, and a second paper layer 5 stacked in sequence. A reinforcing adhesive layer 6 is provided between the first composite adhesive layer 2 and the polyester film layer 3 and / or between the second composite adhesive layer 4 and the polyester film layer 3.

[0040] It is understandable that the thicknesses of the first paper layer 1, the first composite adhesive layer 2, the polyester film layer 3, the second composite adhesive layer 4, the second paper layer 5, and the reinforcing adhesive layer 6 can be set as needed. The first composite adhesive layer 2 can cover the entire contact surface between the first paper layer 1 and the polyester film layer 3, or it can cover only a portion of the contact surface between the first paper layer 1 and the polyester film layer 3. Its main function is adhesion, and the materials used can be set as needed, but must have good adhesion. The second composite adhesive layer 4 can cover the entire contact surface between the second paper layer 5 and the polyester film layer 3, or it can cover only a portion of the contact surface between the second paper layer 5 and the polyester film layer 3. Its main function is adhesion, and the materials used can be set as needed, but must have good adhesion. The reinforcing adhesive layer 6 can cover the entire contact surface between the first paper layer 1 and the polyester film layer 3, or it can cover only a portion of the contact surface between the first paper layer 1 and the polyester film layer 3. The reinforcing adhesive layer 6 can cover the entire contact surface between the second paper layer 5 and the polyester film layer 3, or it can cover only a portion of the contact surface between the second paper layer 5 and the polyester film layer 3. The main function of the reinforcing adhesive layer 6 is to increase the elongation at break and tear strength of the composite insulating paper. Materials with certain strength and toughness can be selected. The materials used for the first paper layer 1 and the second paper layer 5 can be selected as needed. To meet the performance requirements of the composite insulating paper, materials with good insulation and paint adhesion can be selected for the first paper layer 1 and the second paper layer 5. To protect the polyester film layer 3, the composite adhesive layer material can be selected with good adhesion and oil barrier properties. To meet the assembly requirements of the composite insulating paper, materials with certain strength and toughness can be selected for the polyester film layer 3 and the reinforcing adhesive layer 6.

[0041] Please see Figure 1 In this application, a reinforcing adhesive layer 6 may be provided between the first composite adhesive layer 2 and the polyester film layer 3, and between the second composite adhesive layer 4 and the polyester film layer 3.

[0042] Please see Figure 2 In this application, a reinforcing adhesive layer 6 may be provided only between the second composite adhesive layer 4 and the polyester film layer 3.

[0043] Please see Figure 3 In this application, a reinforcing adhesive layer 6 may be provided only between the first composite adhesive layer 2 and the polyester film layer 3, and between the second composite adhesive layer 4 and the polyester film layer 3.

[0044] In some embodiments, the reinforcing adhesive layer (6) is disposed between the first composite adhesive layer (2) and the polyester film layer (3) and / or between the second composite adhesive layer (4) and the polyester film layer (3), the ratio of the total thickness of the reinforcing adhesive layer (6) to the thickness of the first composite adhesive layer (2) is (1~2):1, and / or the ratio of the total thickness of the reinforcing adhesive layer (6) to the thickness of the second composite adhesive layer (4) is (1~2):1.

[0045] Please see Figure 3 In some embodiments, the reinforcing adhesive layer 6 is disposed between the first composite adhesive layer 2 and the polyester film layer 3, and the thickness ratio of the reinforcing adhesive layer 6 to the thickness of the first composite adhesive layer 2 is (1~2):1. Within this range, it can effectively reinforce the composite insulating paper while avoiding excessive stiffness of the composite insulating paper, which would be detrimental to assembly.

[0046] Please see Figure 2 In some embodiments, the reinforcing adhesive layer 6 is disposed between the second composite adhesive layer 4 and the polyester film layer 3, and the thickness ratio of the reinforcing adhesive layer 6 to the thickness of the first composite adhesive layer 2 is (1~2):1. Within this range, it can effectively reinforce the composite insulating paper while avoiding excessive stiffness of the composite insulating paper, which would be detrimental to assembly.

[0047] Please see Figure 1 In some embodiments, the reinforcing adhesive layer 6 is disposed between the first composite adhesive layer 2 and the polyester film layer 3 and between the second composite adhesive layer 4 and the polyester film layer 3. The ratio of the total thickness of the reinforcing adhesive layer 6 to the thickness of the first composite adhesive layer 2 is (1~2):1, and the ratio of the total thickness of the reinforcing adhesive layer 6 to the thickness of the second composite adhesive layer 4 is (1~2):1. Within these ranges, the composite insulating paper can be effectively reinforced while avoiding excessive stiffness of the composite insulating paper, which would be detrimental to assembly.

[0048] Please see Figure 1 The thickness of the reinforcing adhesive layer 6 between the first composite adhesive layer 2 and the polyester film layer 3 is the same as the thickness of the reinforcing adhesive layer 6 between the second composite adhesive layer 4 and the polyester film layer 3.

[0049] Please see Figure 4 The thickness of the reinforcing adhesive layer 6 between the first composite adhesive layer 2 and the polyester film layer 3 is different from the thickness of the reinforcing adhesive layer 6 between the second composite adhesive layer 4 and the polyester film layer 3.

[0050] Please see Figure 3In some embodiments, the reinforcing adhesive layer 6 is disposed between the first composite adhesive layer 2 and the polyester film layer 3, and the thickness of the reinforcing adhesive layer 6 is 20-40 micrometers.

[0051] Please see Figure 2 In some embodiments, the reinforcing adhesive layer 6 is disposed between the second composite adhesive layer 4 and the polyester film layer 3, and the thickness of the reinforcing adhesive layer 6 is 20-40 micrometers.

[0052] Please see Figure 1 In some embodiments, the reinforcing adhesive layer 6 is disposed between the first composite adhesive layer 2 and the polyester film layer 3 and between the second composite adhesive layer 4 and the polyester film layer 3, and the total thickness of the reinforcing adhesive layer 6 between the first composite adhesive layer 2 and the polyester film layer 3 and the reinforcing adhesive layer 6 between the second composite adhesive layer 4 and the polyester film layer 3 is 20-40 micrometers.

[0053] In some embodiments, the thickness of the first paper layer 1 is 30-60 micrometers.

[0054] In some embodiments, the thickness of the first composite adhesive layer 2 is 20-40 micrometers.

[0055] In some embodiments, the thickness of the polyester film layer 3 is 50-100 micrometers.

[0056] In some embodiments, the thickness of the second composite adhesive layer 4 is 20-40 micrometers.

[0057] In some embodiments, the thickness of the second paper layer 5 is 30-60 micrometers.

[0058] In some embodiments, the tear strength of the reinforcing adhesive layer 6 is 400-1000 N / 20 mm.

[0059] In some embodiments, the toughness parameter of the reinforcing adhesive layer 6 is an elongation at break of 50-200%.

[0060] In some embodiments, the first paper layer 1 comprises an aramid paper layer.

[0061] It is understandable that aramid paper has good insulation and paint adhesion properties, which can give the aramid paper layer good insulation and paint adhesion properties.

[0062] In some embodiments, the second paper layer 5 comprises an aramid paper layer.

[0063] It is understandable that aramid paper has good insulation and paint adhesion properties, which can give the aramid paper layer good insulation and paint adhesion properties.

[0064] In some embodiments, the polyester film layer 3 comprises a polyethylene naphthalate film layer.

[0065] In some embodiments, the reinforcing adhesive layer 6 comprises at least one of an epoxy resin layer, a polyacrylic resin layer, a phenoxy resin layer, and a mixed layer formed of at least two of epoxy resin, polyacrylic resin, and phenoxy resin. It is understood that epoxy resin, polyacrylic resin, and phenoxy resin possess certain strength and toughness, which enables the reinforcing adhesive layer 6 to possess certain strength and toughness.

[0066] Please see Figure 1 The material of the reinforcing adhesive layer 6 between the first composite adhesive layer 2 and the polyester film layer 3 is the same as the material of the reinforcing adhesive layer 6 between the second composite adhesive layer 4 and the polyester film layer 3.

[0067] Please see Figure 5 The material of the reinforcing adhesive layer 6 between the first composite adhesive layer 2 and the polyester film layer 3 is different from the material of the reinforcing adhesive layer 6 between the second composite adhesive layer 4 and the polyester film layer 3.

[0068] In some embodiments, the epoxy resin layer is made of epoxy resin, curing agent, inorganic nanofiller and solvent, wherein the epoxy resin includes one or more of bisphenol A epoxy resin, bisphenol F epoxy resin and rubber modified epoxy resin, and the curing agent includes one or more of polyamide curing agent and acid anhydride curing agent.

[0069] Understandably, inorganic nanofillers can increase the strength and toughness of epoxy resin layers.

[0070] In some embodiments, the material of the polyacrylic resin layer includes polyacrylic resin, curing agent, inorganic nanofiller and solvent, wherein the polyacrylic resin includes hydroxyl acrylate resin and the curing agent includes one or more of amino resin curing agents and isocyanate curing agents.

[0071] Understandably, inorganic nanofillers can increase the strength and toughness of polyacrylic resin layers.

[0072] The phenoxy resin layer is made of phenoxy resin, curing agent, inorganic nanofiller and solvent, wherein the phenoxy resin and the curing agent include one or more of amino resin curing agents and isocyanate curing agents.

[0073] Understandably, inorganic nanofillers can increase the strength and toughness of phenoxy resin layers.

[0074] In some embodiments, the first composite adhesive layer 2 includes at least one of an epoxy resin layer, a polyacrylate resin layer, or a mixture of epoxy resin and polyacrylate resin, and the glass transition temperature of the first composite adhesive layer 2 is ≤20°C.

[0075] Understandably, composite adhesive layers with low glass transition temperature (Tg) can adjust the stiffness of composite insulating paper.

[0076] In some embodiments, the second composite adhesive layer 4 includes at least one of an epoxy resin layer, a polyacrylate resin layer, or a mixture of epoxy resin and polyacrylate resin, and the glass transition temperature of the second composite adhesive layer 4 is ≤20°C.

[0077] Understandably, composite adhesive layers with low glass transition temperature (Tg) can adjust the stiffness of composite insulating paper.

[0078] In some embodiments, the glass transition temperature of the first composite adhesive layer 2 is 0~10℃.

[0079] In some embodiments, the glass transition temperature of the second composite adhesive layer 4 is 0~10°C.

[0080] In some embodiments, the epoxy resin layer is made of epoxy resin, toughening agent, curing agent and solvent. The epoxy resin includes one or more of bisphenol A epoxy resin, bisphenol F epoxy resin and rubber modified epoxy resin. The toughening agent includes hydroxyl acrylate resin with a glass transition temperature of -30~10℃. The curing agent includes one or more of polyamide curing agents and acid anhydride curing agents.

[0081] In some embodiments, the material of the polyacrylate resin layer includes polyacrylate resin, curing agent and solvent, wherein the polyacrylate resin includes hydroxyl acrylate resin with a glass transition temperature of -30 to 10°C, and the curing agent includes one or more of amino resin curing agents and isocyanate curing agents.

[0082] According to a second aspect of this application, a hairpin motor is provided, comprising the aforementioned composite insulating paper.

[0083] According to a third aspect of this application, a vehicle is provided, including the aforementioned card-issuing motor.

[0084] Example 1

[0085] (1) Preparation of reinforcing adhesive raw materials: 100 parts by weight of phenoxy resin YP-50S, 49 parts by weight of isocyanate curing agent MDI50, 1.5 parts by weight of nano silica, and 200 parts by weight of solvent methyl ethyl ketone are stirred and mixed evenly to obtain reinforcing adhesive raw materials.

[0086] (2) Preparation of film with reinforcing adhesive layer: The reinforcing adhesive raw material is coated on both sides of the polyethylene naphthalate (PEN) film, the solvent in the reinforcing adhesive raw material is removed by baking, and then the reinforcing adhesive is cured by heating to obtain film with reinforcing adhesive layer.

[0087] (3) Preparation of composite adhesive raw materials: 100 parts by weight of hydroxy acrylate resin (Tg is -25℃) and 11 parts by weight of isocyanate curing agent HDI are stirred and mixed evenly to obtain composite adhesive raw materials;

[0088] (4) Preparation of composite insulating paper: The composite adhesive raw material is coated onto the upper and lower surfaces of the film with reinforcing adhesive, the solvent in the composite adhesive raw material is removed by baking, and then the aramid paper is pressed onto the upper and lower surfaces of the film by rollers and heated to cure, to obtain composite insulating paper (including aramid layer, composite adhesive layer, reinforcing adhesive layer, polyester film layer, reinforcing adhesive layer, composite adhesive layer and aramid layer stacked in sequence, the thickness parameters and strength and toughness parameters are shown in Table 1).

[0089] Installation verification: When the composite insulating paper obtained in this embodiment is assembled into the stator, no visible cracks are observed when the hairpin is twisted.

[0090] The composite insulating paper obtained in this embodiment was tested and found to have an edge longitudinal tear strength of 657 N / 20 mm, an edge transverse tear strength of 702 N / 20 mm, a longitudinal breaking elongation of 79%, and a transverse breaking elongation of 91%.

[0091] Table 1 shows the thickness, strength, and toughness parameters of the composite insulating paper obtained in the examples.

[0092]

[0093] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0094] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0095] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0096] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A composite insulating paper, characterized in that, It includes a first paper layer (1), a first composite adhesive layer (2), a polyester film layer (3), a second composite adhesive layer (4), and a second paper layer (5) stacked in sequence. A reinforcing adhesive layer (6) is provided between the first composite adhesive layer (2) and the polyester film layer (3) and / or between the second composite adhesive layer (4) and the polyester film layer (3).

2. The composite insulating paper according to claim 1, characterized in that, The reinforcing adhesive layer (6) is disposed between the first composite adhesive layer (2) and the polyester film layer (3) and / or between the second composite adhesive layer (4) and the polyester film layer (3). The ratio of the total thickness of the reinforcing adhesive layer (6) to the thickness of the first composite adhesive layer (2) is (1~2):1, and / or the ratio of the total thickness of the reinforcing adhesive layer (6) to the thickness of the second composite adhesive layer (4) is (1~2):

1.

3. The composite insulating paper according to claim 1, characterized in that, The reinforcing adhesive layer (6) is disposed between the first composite adhesive layer (2) and the polyester film layer (3) and / or between the second composite adhesive layer (4) and the polyester film layer (3), and the total thickness of the reinforcing adhesive layer (6) is 20-40 micrometers.

4. The composite insulating paper according to claim 1, characterized in that, The tear strength of the reinforcing adhesive layer (6) is 400-1000N / 20mm; And / or, the toughness parameter of the reinforcing adhesive layer (6) is an elongation at break of 50-200%.

5. The composite insulating paper according to claim 1, characterized in that, The first paper layer (1) includes an aramid paper layer; And / or, the second paper layer (5) includes an aramid paper layer.

6. The composite insulating paper according to claim 1, characterized in that, The polyester film layer (3) includes a polyethylene naphthalate film layer.

7. The composite insulating paper according to claim 1, characterized in that, The reinforcing adhesive layer (6) includes an epoxy resin layer, a polyacrylic resin layer, or a phenoxy resin layer.

8. The composite insulating paper according to claim 1, characterized in that, The first composite adhesive layer (2) includes an epoxy resin layer or a polyacrylate resin layer, and the glass transition temperature of the first composite adhesive layer (2) is ≤20℃. And / or, the second composite adhesive layer (4) includes an epoxy resin layer or a polyacrylate resin layer, and the glass transition temperature of the second composite adhesive layer (4) is ≤20°C.

9. The composite insulating paper according to claim 8, characterized in that, The glass transition temperature of the first composite adhesive layer (2) is 0~10℃; And / or, the glass transition temperature of the second composite adhesive layer (4) is 0~10℃.

10. A hairpin motor, characterized in that, Includes the composite insulating paper as described in any one of claims 1-9.

11. A vehicle, characterized in that, Includes the hairpin motor as described in claim 10.

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