Epoxy bonding composite material and curing method thereof

Abstract

The invention relates to the technical field of bonding materials, in particular to an epoxy bonding composite material and a curing method thereof, and the epoxy bonding composite material is obtained by firstly preparing a wrapping layer, then performing pre-pressing and vacuum pressure dipping treatment, irradiating the wrapping layer by using X-rays and performing post-treatment. Through combination of a VPI (vacuum pressure impregnation) process and low-temperature X-ray irradiation curing, generation of bubbles and micro-air gaps is inhibited from the source, the interlayer gap is smaller than or equal to 0.2 mu m, the partial discharge initial voltage is remarkably improved, and the partial discharge hidden danger is eliminated.

Description

Technical Field

[0001] This invention relates to the field of adhesive materials technology, specifically to an epoxy adhesive composite material and its curing method. Background Technology

[0002] In recent years, with my country's power generation repeatedly reaching new highs, the vigorous development of hydropower clean energy, supplemented by pumped storage, has made the long-term stable and efficient operation of hydro-generator units a top priority for power system maintenance. The stator bars, as the basic structural unit of the generator armature winding, undergo relative motion cutting magnetic lines of force within the stable air gap magnetic field synthesized by the pole magnetomotive force and the armature magnetomotive force. This generates an electromotive force on the stator side, completing the electromagnetic process of energy conversion within the generator. The surface insulation layer of the stator bars is composed of multiple self-insulated conductors, which are braided, transposed, and gelled, then wrapped with an overall insulation layer and cured using a specific process. The braiding process reduces eddy current losses, weakens the skin effect, and increases the current carrying capacity of the copper strands in the bars. Simultaneously, transposition at different angles avoids circulating currents that may be induced by magnetic flux in the slots and end leakage flux between strands, thus reducing heat loss.

[0003] The insulation wrapping layer of the conductor bars in existing hydro-generator units is usually prepared by thermosetting epoxy mica glass ribbon, epoxy resin, or F-grade tung oil epoxy powder mica multi-adhesive by heating and molding. This method has the following drawbacks: ① The thermosetting process generates volatiles, forming micro-gaps between layers, leading to partial discharge (PDIV < 2kV); ② These gaps trigger corona discharge, causing electro-corrosion on the conductor bar surface (average corrosion depth > 0.1mm per year); ③ Uneven curing leads to internal electric field distortion and failure of the anti-corrosion layer (surface potential gradient > 3kV / cm). While existing thermosetting methods (VPI (vacuum pressure impregnation) or HEC (multi-adhesive molding)) offer advantages in heat penetration, they fail to effectively address the problem of micro-gaps between layers caused by the escape of high-temperature volatiles, as well as the uneven curing caused by uneven heating and heat accumulation on curved conductor bars, thus affecting the interfacial bonding strength and electric field distribution uniformity of the anti-corrosion layer. Summary of the Invention

[0004] The purpose of this invention is to provide an epoxy adhesive composite material and its curing method, which solves the technical problems in the prior art such as micro-air gaps between layers caused by the escape of high-temperature volatiles, uneven curing caused by uneven heating and heat accumulation of curved wire bars, which in turn affect the interfacial bonding strength and electric field distribution uniformity of the anti-halo layer.

[0005] This invention discloses a curing method for epoxy adhesive composite materials. First, a wrapping layer is prepared, then pre-pressed and vacuum pressure impregnated (VPI) is performed, the wrapping layer is irradiated with X-rays, and post-processing is performed to obtain the final product.

[0006] Furthermore, the X-ray irradiation uses an industrial X-ray irradiation system.

[0007] Furthermore, the industrial X-ray irradiation system is a 10MeV high-energy electron accelerator with a tantalum target and an X-ray peak intensity of 400keV.

[0008] Furthermore, the non-working area is shielded before X-ray irradiation.

[0009] Furthermore, the non-operational area shielding specifically involves installing tungsten alloy shielding covers at both ends of the online rod.

[0010] Setting up a tungsten alloy shield can effectively absorb and block X-rays directed at the copper conductor at the end, focusing the X-ray energy onto the insulation wrapping area of ​​the bar, thus reducing unnecessary irradiation of the copper conductor at the end of the bar.

[0011] Furthermore, the X-ray irradiation absorbed dose ranges from 20 to 40 kGy, and the surface temperature rise is ≤30°C.

[0012] Furthermore, the X-ray irradiation can be single-sided or double-sided. During single-sided irradiation, the control system sends instructions to the motion mechanism to adjust the X-ray irradiation system to perform the irradiation operation; during double-sided irradiation, after one side's irradiation operation is completed, the motion mechanism adjusts the X-ray irradiation system's winding rod to rotate circumferentially by a certain angle to irradiate the other side.

[0013] Furthermore, for wire rods with a diameter ≤10 cm, single-sided irradiation is used, with a single-sided absorbed dose range of 20-40 kGy and a single-sided irradiation time ≥8 min; For wire rods with a diameter >10 cm, double-sided irradiation is used, with a single-sided absorbed dose ≥25 kGy and a single-sided irradiation time ≥5 min.

[0014] Furthermore, the wrapping layer includes an underlayer, an anti-scintillation layer, and an adhesive material layer.

[0015] Furthermore, the base layer is a basic insulation layer, which is prepared by weaving, transposing, and wrapping epoxy resin impregnated mica tape (thickness 0.15±0.02mm) on the stator bars.

[0016] Furthermore, the mica tape has a thickness of 0.15±0.02mm.

[0017] Furthermore, the method for preparing the anti-dizziness layer is as follows: an epoxy resin layer containing silicon carbide (SiC) filler is brushed or sprayed onto the surface of the base layer.

[0018] Furthermore, the concentration of the silicon carbide filler is distributed in a gradient, increasing from the straight section of the bar to the end, with a filler gradient concentration of 10-30 wt%.

[0019] Furthermore, the silicon carbide filler has a particle size of 1-20 μm.

[0020] Furthermore, the method for preparing the adhesive material layer is as follows: a solvent-free impregnated adhesive material is brushed onto the entire surface of the anti-dizziness layer.

[0021] Furthermore, the adhesive material comprises epoxy phenolic resin (DEN431) and a two-component photoacid generating agent PAG.

[0022] Furthermore, the two-component photoacid generating agent is triphenylthionium hexafluoroantimonate (C6H5)3S. + SbF6 - ).

[0023] Furthermore, based on the mass of the adhesive material as 100%, the amount of the two-component photoacid generating agent PAG added is 2.0-3.5 wt%, and in some embodiments it is 2.5-3.0 wt%.

[0024] Furthermore, an outer coating layer is prepared on the wrapping layer before pre-compression treatment.

[0025] Furthermore, the outer coating layer preparation method involves repeatedly wrapping the outer coating layer with epoxy mica tape in a semi-overlapping manner for more than 3 layers.

[0026] Furthermore, the pre-compression tension in the pre-compression treatment is 25±5N.

[0027] Pre-compression helps to initially compact the insulation wrapping layer, expel some air, and create better conditions for subsequent VPI.

[0028] Furthermore, the vacuum pressure impregnation (VPI) process involves removing the air between the insulation layers of the stator bars after pre-pressing, followed by the vacuum pressure impregnation (VPI) process.

[0029] Furthermore, the vacuum level of the container after evacuation is ≤10Pa.

[0030] It can eliminate air and volatiles inside the wrapping layer to the greatest extent possible.

[0031] Furthermore, after the vacuum pressure impregnation (VPI) treatment is completed, the container is pressurized, with a pressure range of 0.8-1.0 MPa, and in some embodiments 0.8 MPa, 0.9 MPa, and 1.0 MPa, for a continuous pressure holding time of ≥3 hours.

[0032] Ensure that the adhesive material inside the insulating wrapping layer fully penetrates the interlayer.

[0033] Furthermore, the post-processing includes stepped heating heat treatment and interface strengthening.

[0034] Furthermore, the stepped heating heat treatment is carried out under nitrogen protection.

[0035] Furthermore, the stepped heating heat treatment specifically involves: holding at 80-85℃ for 1 hour, raising the temperature to 120-125℃ and holding for 1 hour, then raising the temperature to 160-165℃ and holding for 3 hours.

[0036] Furthermore, the interface strengthening is achieved by applying a pressure of 0.3-0.8 MPa to the wire rod insulation wrapping layer in the radial direction for a holding time of ≥3 hours.

[0037] Furthermore, the specific indicators for the quality of the insulation wrapping layer of the wire rod after curing by X-ray irradiation are as follows: there are no bubbles, delamination or air gaps inside the insulation wrapping layer, and the interlayer gap is ≤0.2μm; the surface potential gradient of the insulation wrapping layer is ≤0.5kV / cm.

[0038] An epoxy adhesive composite material is prepared using the above method.

[0039] Compared with the prior art, the beneficial effects of the present invention are: 1. Zero-gap insulation: Combining VPI (vacuum pressure impregnation) process with low-temperature X-ray irradiation curing (temperature rise ≤30℃, no volatile organic compounds generated by high-temperature curing), the generation of bubbles and micro-gap is suppressed from the source, achieving an interlayer gap ≤0.2μm, significantly improving the partial discharge initiation voltage, and eliminating the hidden danger of partial discharge; 2. Excellent and stable anti-corona performance: The PAG concentration is increased to enhance the curing degree of the anti-corona layer. Combined with the gradient anti-corona filler design, it ensures that the anti-corona layer is fully cured under X-ray irradiation, achieving a surface potential gradient of ≤0.5kV / cm, effectively suppressing corona discharge; 3. Improved resistance to electrochemical corrosion: High cross-linking density (e.g., gel rate ≥ 95%) and dense interlayer bonding can significantly reduce the channels for corrosive media penetration, resulting in a significant improvement in the acid and alkali corrosion resistance of the wire bar insulation wrapping compared to traditional thermosetting methods. 4. Deep and uniform curing: Utilizing the excellent penetrating power of X-rays, combined with the single-sided or double-sided irradiation design for different diameters and thicknesses of the wire rod insulation wrapping layer, it can ensure that the interior of the wire rod insulation wrapping layer of different diameter sizes can be uniformly and fully cured, solving the problem of uneven heating between different areas inside and outside that may exist in thermosetting. Attached Figure Description

[0040] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 Flowchart of X-ray irradiation curing process for stator bar insulation wrapping. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0043] Example 1 (Single-sided irradiation curing of stator wire rod) This embodiment discloses an epoxy adhesive composite material and its curing method, such as Figure 1 The steps shown are as follows: Wire rod dimensions: φ8cm × 200cm S1: Preparation of the cladding layer: 1) Apply the base layer: Wrap 0.15mm epoxy mica tape around the base layer; 2) Anti-halo layer: Apply an epoxy resin layer containing 15wt% SiC (particle size 1~20μm) by brushing; 3) Adhesive layer: Epoxy phenolic resin (DEN431) + 2.5wt% two-component photoacid generating agent (triphenylthionium hexafluoroantimonate ((C6H5)3S) + SbF6 - ).

[0044] S2: Pre-compression and VPI processing: 1) Outer covering layer: 3 layers of mica tape reinforcement covering, with a pre-compression tension of 25N.

[0045] 2) VPI: Vacuum degree 5Pa, impregnation pressure 0.8MPa, pressure holding time 3 hours.

[0046] S3: X-ray irradiation curing process: 1) Industrial X-ray irradiation system: 10MeV high-energy electron accelerator + tantalum target (X-ray peak intensity 400keV); 2) Shielding of non-operational areas: Tungsten alloy shielding covers are installed at both ends of the line rod.

[0047] 3) Irradiation method: The control system sends instructions to the motion mechanism to adjust the X-ray irradiation system to perform the irradiation operation: single-sided irradiation, irradiation time 8 minutes.

[0048] 4) Total absorbed dose from irradiation: 40 kGy (surface temperature rise: ≤25℃).

[0049] S4: Post-processing: 1) Step-by-step temperature control program setting: 80℃ / hold for 1h → 120℃ / hold for 1h → 160℃ / hold for 3h (nitrogen atmosphere protection).

[0050] 2) Interface strengthening: After the temperature rises to 160℃ in a stepped manner, a pressure of 0.5MPa is applied to the stator bar insulation wrapping layer in the radial direction to further compact the insulation layer, and the pressure holding time is ≥3h.

[0051] S5: Quality Inspection Inspection results: The surface of the insulation wrapping layer of the wire rod is smooth and dense, with no visible air bubbles. Ultrasonic testing showed an interlayer gap of <0.2μm, and partial discharge testing showed a surface potential gradient of ≤0.5kV / cm. The quality of the wire rod insulation wrapping layer after curing meets the requirements.

[0052] Example 2 (Curing stator bars on both sides) Beam size: φ18cm × 500cm S1: Preparation of the cladding layer: 1) Apply the base layer: Wrap 0.15mm epoxy mica tape around the base layer; 2) Anti-halo layer: Apply an epoxy resin layer containing 20wt% SiC (particle size 1~20μm) by brushing; 3) Adhesive layer: Epoxy phenolic resin (DEN431) + 2.5wt% two-component photoacid generating agent (triphenylthionium hexafluoroantimonate ((C6H5)3S) + SbF6 - ).

[0053] S2: Pre-compression and VPI processing: 1) Outer covering layer: 3 layers of mica tape reinforcement covering, with a pre-compression tension of 30N.

[0054] 2) VPI: Vacuum degree 10Pa, impregnation pressure 0.8MPa, pressure holding time 4 hours.

[0055] S3: X-ray irradiation curing process: 1) Industrial X-ray irradiation system: 10MeV high-energy electron accelerator + tantalum target (X-ray peak intensity 400keV); 2) Shielding of non-operational areas: Tungsten alloy shielding covers are installed at both ends of the line rod.

[0056] 3) Irradiation method: The control system sends instructions to the motion mechanism to adjust the X-ray irradiation system to perform the irradiation operation: double-sided irradiation. After the single-sided irradiation operation is completed, the winding bar rotates circumferentially to irradiate the next side. The single-sided irradiation time is about 6 minutes.

[0057] 4) Total absorbed dose from irradiation: 56 kGy (surface temperature rise: <30℃).

[0058] S4: Post-processing: 1) Step-by-step temperature control program setting: 80℃ / hold for 1h → 120℃ / hold for 1h → 160℃ / hold for 3h (nitrogen atmosphere protection).

[0059] 2) Interface strengthening: After the temperature rises to 160℃ in a stepped manner, a pressure of 0.5MPa is applied to the stator bar insulation wrapping layer in the radial direction to further compact the insulation layer, and the pressure holding time is ≥3h.

[0060] S5: Quality Inspection Inspection results: The surface of the insulation wrapping layer of the wire rod is smooth and dense, with no visible air bubbles. Ultrasonic testing showed an interlayer gap of <0.2μm, and partial discharge testing showed a surface potential gradient of ≤0.5kV / cm. The quality of the wire rod insulation wrapping layer after curing meets the requirements.

[0061] Comparative Example 1 This comparative example discloses an epoxy adhesive composite material and its curing method. Based on Example 1, it does not introduce X-ray irradiation technology, but instead employs a traditional hot-press curing process (180℃ / 3h). The process includes the following steps: Wire rod dimensions: φ8cm × 200cm S1: Preparation of the cladding layer: 1) Apply the base layer: Wrap 0.15mm epoxy mica tape around the base layer; 2) Anti-halo layer: Apply an epoxy resin layer containing 15wt% SiC (particle size 1~20μm) by brushing; 3) Adhesive layer: Epoxy phenolic resin (DEN431) + 2.5wt% two-component photoacid generating agent (triphenylthionium hexafluoroantimonate ((C6H5)3S) + SbF6 - ).

[0062] S2: Pre-compression and VPI processing: 1) Outer coating: Three layers of mica tape reinforcement, with a pre-compression tension of 25N; 2) VPI: Impregnate in solvent-free impregnation resin (epoxy resin 3407A and acid anhydride curing agent 3407B mixed in a 1:1 weight percentage), impregnation pressure 0.8MPa, vacuum degree 5Pa, pressure holding time 3 hours.

[0063] S3: Hot pressing curing treatment: During the heating stage to 180℃ (under nitrogen atmosphere protection), apply a pressure of 0.5MPa in the radial direction to the stator bar insulation wrapping layer to further compact the insulation layer, and maintain the pressure for ≥3h.

[0064] S4: Quality Inspection Inspection results: No visible bubbles were found on the surface of the insulation wrapping layer of the wire rod; the interlayer gap was >5μm according to ultrasonic testing; the partial discharge detection initiation voltage was 1.8kV; and the surface potential gradient test was ≤3.2kV / cm.

[0065] This indicates that after the insulation wrapping layer of the wire rod is thermo-cured, the high-temperature volatiles can easily escape and form micro-gaps, and the uneven heating of the insulation wrapping layer as a whole leads to electric field distortion.

[0066] Comparative Example 2 This comparative example discloses an epoxy adhesive composite material and its curing method. Based on Example 1, the X-ray single-sided irradiation dose is modified, reducing the irradiation dose to 7 kGy (far lower than the 20-40 kGy required by the patented method). The method includes the following steps: Wire rod dimensions: φ8cm × 200cm S1: Preparation of the cladding layer: 1) Apply the base layer: Wrap 0.15mm epoxy mica tape around the base layer; 2) Anti-halo layer: Apply an epoxy resin layer containing 15wt% SiC (particle size 1~20μm) by brushing; 3) Adhesive layer: Epoxy phenolic resin (DEN431) + 2.5wt% two-component photoacid generating agent (triphenylthionium hexafluoroantimonate ((C6H5)3S) + SbF6 - ).

[0067] S2: Pre-compression and VPI processing: 1) Outer coating: Three layers of mica tape reinforcement, with a pre-compression tension of 25N; 2) VPI: Impregnate in solvent-free impregnation resin (epoxy resin 3407A and acid anhydride curing agent 3407B mixed in a 1:1 weight percentage), impregnation pressure 0.8MPa, vacuum degree 5Pa, pressure holding time 3 hours.

[0068] S3: X-ray irradiation curing process: 1) Industrial X-ray irradiation system: 10MeV high-energy electron accelerator + tantalum target (X-ray peak intensity 400keV); 2) Shielding of non-operational areas: Tungsten alloy shielding covers are installed at both ends of the line rod.

[0069] 3) Irradiation method: The control system sends instructions to the motion mechanism to adjust the X-ray irradiation system to perform the irradiation operation: single-sided irradiation, irradiation time 8 minutes.

[0070] 4) Total absorbed dose from irradiation: 7 kGy (surface temperature rise: ≤25℃).

[0071] S4: Post-processing: 1) Step-by-step temperature control program setting: 80℃ / hold for 1h → 120℃ / hold for 1h → 160℃ / hold for 3h (nitrogen atmosphere protection).

[0072] 2) Interface strengthening: After the temperature rises to 160℃ in a stepped manner, a pressure of 0.5MPa is applied to the stator bar insulation wrapping layer in the radial direction to further compact the insulation layer, and the pressure holding time is ≥3h.

[0073] S5: Quality Inspection Inspection results: No visible bubbles were found on the surface of the insulation wrapping layer of the wire rod; the interlayer gap detected by ultrasonic testing was >8μm.

[0074] This indicates that the insufficient X-ray dose led to incomplete PAG decomposition and low epoxy conversion rate in the wire rod insulation wrapping layer, resulting in low gelation rate, insufficient crosslinking density, and large interlayer gaps. Furthermore, the layer failed to fully cure even after interface strengthening.

[0075] Comparative Example 3 This comparative example discloses an epoxy adhesive composite material and its curing method. Based on Example 1, the PAG addition amount is changed, reducing it to 1.0 wt% (far lower than the 2.0-3.5 wt% required by the patented method). The method includes the following steps: Wire rod dimensions: φ8cm × 200cm S1: Preparation of the cladding layer: 1) Apply the base layer: Wrap 0.15mm epoxy mica tape around the base layer; 2) Anti-halo layer: Apply an epoxy resin layer containing 15wt% SiC (particle size 1~20μm) by brushing; 3) Adhesive layer: Epoxy phenolic resin (DEN431) + 1.0wt% two-component photoacid generating agent (triphenylthionium hexafluoroantimonate ((C6H5)3S) + SbF6 - ).

[0076] S2: Pre-compression and VPI processing: 1) Outer covering layer: 3 layers of mica tape reinforcement covering, with a pre-compression tension of 25N.

[0077] 2) VPI: Impregnate in solvent-free impregnation resin (epoxy resin 3407A and acid anhydride curing agent 3407B mixed in a 1:1 weight percentage), impregnation pressure 0.8MPa, vacuum degree 5Pa, pressure holding time 3 hours.

[0078] S3: X-ray irradiation curing process: 1) Industrial X-ray irradiation system: 10MeV high-energy electron accelerator + tantalum target (X-ray peak intensity 400keV); 2) Shielding of non-operational areas: Tungsten alloy shielding covers are installed at both ends of the line rod.

[0079] 3) Irradiation method: The control system sends instructions to the motion mechanism to adjust the X-ray irradiation system to perform the irradiation operation: single-sided irradiation, irradiation time 8 minutes.

[0080] 4) Total absorbed dose from irradiation: 40 kGy (surface temperature rise: ≤25℃).

[0081] S4: Post-processing: 1) Step-by-step temperature control program setting: 80℃ / hold for 1h → 120℃ / hold for 1h → 160℃ / hold for 3h (nitrogen atmosphere protection).

[0082] 2) Interface strengthening: After the temperature rises to 160℃ in a stepped manner, a pressure of 0.5MPa is applied to the stator bar insulation wrapping layer in the radial direction to further compact the insulation layer, and the pressure holding time is ≥3h.

[0083] S5: Quality Inspection Inspection results: The surface of the insulation wrapping layer of the wire bar is smooth and dense, with no visible bubbles. The surface potential gradient test for partial discharge detection is 2.8kV / cm.

[0084] Furthermore, uneven heating of the curved wire rod leads to electric field distortion. This indicates that insufficient PAG concentration in the bar insulation wrapping layer leads to low photoacid generation and low epoxy conversion rate, resulting in low gelation rate and insufficient crosslinking density. Consequently, the overall curing of the bar insulation wrapping layer is incomplete and uneven, causing electric field distortion.

[0085] The above are the embodiments listed in this example. However, this example is not limited to the optional embodiments described above. Those skilled in the art can arbitrarily combine the above methods to obtain other various embodiments. Anyone can derive other various forms of embodiments based on the inspiration of this example. The above specific embodiments should not be construed as limiting the scope of protection of this example. The scope of protection of this example should be determined by the claims, and the specification can be used to interpret the claims.

Claims

1. A curing method for epoxy adhesive composite materials, characterized in that: First, a wrapping layer is prepared, then pre-compression and vacuum pressure impregnation are performed, the wrapping layer is irradiated with X-rays, and post-processing is performed to obtain the final product.

2. The curing method for an epoxy adhesive composite material according to claim 1, characterized in that: The X-ray irradiation absorbed dose ranges from 20 to 40 kGy, and the surface temperature rise is ≤30℃.

3. The curing method for an epoxy adhesive composite material according to claim 1, characterized in that: The wrapping layer includes an underlayer, an anti-scanning layer, and an adhesive material layer.

4. The curing method for an epoxy adhesive composite material according to claim 3, characterized in that: The base layer is a basic insulation layer, which is prepared by weaving, transposing and wrapping epoxy resin impregnated mica tape on the stator bars. And / or the method for preparing the anti-halo layer is: to brush or spray an epoxy resin layer containing silicon carbide filler onto the surface of the base layer; And / or the method for preparing the adhesive material layer is as follows: a solvent-free impregnated adhesive material is brushed onto the entire surface of the anti-halo layer.

5. The curing method for an epoxy adhesive composite material according to claim 4, characterized in that: The thickness of the mica strip is 0.15±0.02mm; And / or the concentration of the silicon carbide filler is gradient-distributed, increasing from the straight section of the rod to the end, with a filler gradient concentration of 10-30 wt%; And / or the adhesive material includes epoxy phenolic resin and a two-component photoacid generating agent.

6. The curing method for an epoxy adhesive composite material according to claim 5, characterized in that: The silicon carbide filler has a particle size of 1-20 μm; And / or the two-component photoacid generating agent is triphenylthionium hexafluoroantimonate.

7. The curing method for an epoxy adhesive composite material according to claim 5, characterized in that: The amount of the two-component photoacid generating agent added is 2.0-3.5 wt%, based on 100% of the adhesive material mass.

8. The curing method for an epoxy adhesive composite material according to claim 1, characterized in that: After preparing the outer coating layer on the wrapping layer, a pre-compression treatment is performed; And / or the vacuum pressure impregnation process is performed by removing the air between the insulation layers of the stator bars after pre-pressing, and then performing the vacuum pressure impregnation process. And / or the post-processing includes stepped heating heat treatment and interface strengthening.

9. The curing method for an epoxy adhesive composite material according to claim 8, characterized in that: The method for preparing the outer coating layer is to repeatedly wrap the outer coating layer with epoxy mica tape in a semi-overlapping manner for more than 3 layers. And / or pressurize the inside of the container after the vacuum pressure impregnation treatment is completed, with a pressurization range of 0.8-1.0 MPa and a continuous pressure holding time of ≥3h; And / or the stepped heating heat treatment is carried out under nitrogen protection, and the stepped heating heat treatment specifically consists of: holding at 80-85℃ for 1 hour, heating up to 120-125℃ and holding for 1 hour, then heating up to 160-165℃ and holding for 3 hours.

10. An epoxy adhesive composite material, characterized in that: It is prepared using the curing method of an epoxy adhesive composite material according to any one of claims 1-9.

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