A method for testing the wetting performance of mica tapes against impregnating resins

Abstract

The application belongs to the technical field of generator stator coil material, and particularly relates to a test method for the impregnation performance of mica tape to impregnated resin. W wetting The test method directly quantitatively reflects the impregnation performance of mica tape to impregnated resin, realizes simple and rapid evaluation of the impregnation performance of mica tape to impregnated resin, and is not only related to the physical characteristics of the mica tape itself, but also related to the physical properties of the impregnated resin, so that accurate evaluation of the impregnation performance of mica tape to impregnated resin is realized. The test method provided by the application provides guidance for the research and design, application of the epoxy glass powder mica tape and impregnated resin for stator coils, and has a good application prospect.

Description

Technical Field

[0001] This invention belongs to the technical field of generator stator coil materials, specifically relating to a method for testing the wetting performance of mica tape on impregnated resin. Background Technology

[0002] The stator coils of large generator sets currently mainly adopt the vacuum pressure impregnation process (VPI process), which is as follows: First, select the appropriate electromagnetic wire according to the motor design and precisely wind the coil. During winding, control the tension of the electromagnetic wire to ensure that the coil is tight and neat, and reserve an appropriate lead length. After winding, wrap it with epoxy glass powder mica tape in a semi-overlapping manner to ensure tight adhesion and moderate tension. Next, place the wrapped stator coil into a vacuum pressure impregnation equipment. First, evacuate the vacuum to remove internal air and moisture, then inject impregnation resin, and then apply pressure to make the impregnation resin fully wet the epoxy glass powder mica tape and all parts of the coil, filling the gaps. Finally, after curing treatment, the resin forms a strong insulating layer, so that the anti-corona tape, main insulation, copper core, and anti-corona protective layer are cured into an integrated structure, which greatly improves the insulation performance of the stator coil. Among them, epoxy glass powder mica tape is generally a strip-shaped insulating material made of mica paper as the base material, phenolic epoxy tung oil anhydride adhesive as the adhesive, and electrical alkali-free glass cloth as the reinforcing material on both sides. It is bonded, composited, and cut. Under normal conditions, it has good flexibility. After being wound into coils and shaped, it has high electrical performance and mechanical strength.

[0003] In the VPI process of stator coils, mica tape is crucial to the wetting performance of the impregnating resin, mainly in the following aspects: (1) Improve insulation reliability: Good impregnation performance allows the impregnating resin to fully fill the gaps and pores of the mica tape, reduce air gaps and defects in the insulation layer, thereby effectively preventing the generation of partial discharge, improving the insulation resistance and breakdown voltage of the stator coil, enhancing the reliability of the insulation system, and ensuring stable operation of the motor under high voltage and high electric field strength. (2) Enhanced corona resistance: After the impregnating resin fully impregnates the mica tape, it can form a more uniform and dense insulation structure, which helps to improve the corona resistance of the mica tape and resin as a whole, reduce the erosion and damage of the insulation by corona discharge, and extend the service life of the stator coil. (3) Improve heat dissipation effect: When the impregnating resin can well wet the mica tape, the contact between the resin and the mica tape is closer, the heat conduction path is smoother, thereby improving the thermal conductivity of the insulation layer, which is conducive to the timely dissipation of heat generated by the stator coil during operation, preventing local overheating, reducing the risk of insulation aging and damage caused by overheating, and improving the heat dissipation efficiency and operation stability of the motor. (4) Enhanced bonding strength: Good wetting performance means that the resin can better penetrate into the interior of the mica tape, fully contact the fibers and adhesives of the mica tape and react chemically to form a strong bonding interface, thereby significantly improving the bonding strength between the mica tape and the conductor and between the layers of the mica tape, making the insulation structure of the stator coil more stable, able to withstand the mechanical stress, electromagnetic force and vibration generated during motor operation, and reducing the delamination and cracking of the insulation layer; (5) Improve tensile strength: The full impregnation of mica tape by the impregnating resin can also improve the flexibility and tensile strength of the mica tape, making it less prone to breakage during winding and curing, and better able to adapt to changes in the shape and size of the stator coil, ensuring the integrity and consistency of the insulation layer.

[0004] (6) Shorten impregnation time: If the mica tape has good wetting performance for impregnation resin, the resin can quickly and evenly penetrate into the mica tape, thereby achieving the ideal impregnation effect in a shorter time, reducing the residence time of the stator coil in the impregnation tank, improving production efficiency and reducing production costs. (7) Reduced impregnation difficulty: Mica tape with good wetting properties can make it easier for impregnating resin to enter the interior of the mica tape. Even in complex stator coil structures or thick insulation layers, the resin can be fully penetrated, reducing the operation difficulty of VPI process and the requirements for equipment, and improving the stability and repeatability of the process.

[0005] Therefore, studying and expressing the wetting characteristics of mica tape on impregnating resin in the process of mica tape wrapping preforms and then impregnating them with resin during stator coil manufacturing is of great significance for the research and development and design of high-performance stator coils.

[0006] Currently, while there are numerous methods for measuring wetting performance, most have certain limitations. For example, measuring complex parameters such as contact angle and wetting force directly reflects wetting performance, but the surface of mica tape is not completely uniform, and its microstructure (multilayer structure, internal pores, etc.) affects the measurement results of these parameters, requiring precise experimental equipment and complex operating procedures. Patent CN 105938076 B discloses a quantitative testing method for the degree of prepreg resin wetting, but this method is not suitable for complex samples such as stator coils and impregnating resins. Furthermore, measuring the time required for the impregnating resin to fully wet in mica tape is a common quantitative method for evaluating wetting performance, but this method requires first preparing a stator coil preform before testing the wetting performance, which is time-consuming and labor-intensive. Therefore, the existing technology lacks a simple, rapid, and accurate measurement standard to quantitatively evaluate the wetting performance of mica tape on impregnating resins.

[0007] Therefore, there is an urgent need to develop a simple, rapid, and accurate quantitative characterization method to determine the wetting performance of mica tape on impregnating resin. Summary of the Invention

[0008] To address the shortcomings of existing technologies, this invention provides a method for testing the wetting performance of epoxy glass powder mica tape on impregnating resin. The aim is to achieve rapid, simple, and accurate characterization of the wetting performance of mica tape on impregnating resin without the need to prepare stator coil preforms.

[0009] This invention provides a method for testing the wetting performance of mica tape to impregnating resin, comprising the following steps: calculating and obtaining parameters characterizing the wetting performance of mica tape using the following formula. W wetting : ; The W r Thermogravimetric analysis was performed on the mica strip to be tested to obtain the residual weight at 600~800℃; The A The specific surface area of ​​the mica strip to be measured is... D The average pore diameter of the mica strip to be measured; The v absorption To vertically immerse the mica strip to be tested in the indicator solution along its length, the rate of increase of the liquid level on the mica strip over time is determined. The or T1 , or T2 , or T3 These are the viscosities of the impregnating resin at T1℃, T2℃, and T3℃, respectively. The S T1 , S T2 , S T3 These represent the surface tensions of the impregnating resin at T1℃, T2℃, and T3℃, respectively. The T1℃ is selected from 18~30℃, the T2℃ is selected from 45~66℃, and the T3℃ is selected from 71~83℃.

[0010] Preferably, the mica tape is selected from epoxy glass powder mica tape.

[0011] Preferably, the epoxy glass powder mica tape is selected from single-sided reinforced type, double-sided reinforced type, and three-in-one type.

[0012] Preferably, the impregnating resin is selected from epoxy impregnating resins.

[0013] Preferably, the residual weight is the residual weight at 800°C.

[0014] Preferably, the A and D Obtained by specific surface area testing method; and / or, the D It is the average pore diameter during the adsorption process.

[0015] Preferably, the indicator in the indicator solution is selected from at least one of toluidine red, chromium oxide green, bromocresol green, neutral red, iron oxide red, pyrrolopyrrole dione red, isoindolinone yellow, and phthalocyanine blue; and / or, the solvent in the indicator solution is selected from at least one of diethyl carbonate, ethyl acetate, xylene, phenol, dimethyl carbonate, ethanol, methanol, acetone, and dimethyl sulfoxide; and / or, the mass fraction of the indicator solution is 0.35-1.69 wt%.

[0016] Preferably, T1℃ is selected from 20-25℃, T2℃ is 50℃, and T3℃ is 80℃.

[0017] Preferably, the residual weight is measured using the test method for weight loss and remaining amount using a thermogravimetric analyzer as specified in GB / T 27761-2011. And / or, the specific surface area and average pore diameter are determined using the method of determining the specific surface area of ​​solid materials by gas adsorption BET method as specified in GB / T 19587-2017. And / or, the viscosity is measured using GB / T 21059-2007 Method for determining the viscosity of polymers / resins in liquid, emulsion or dispersion systems of plastics at a specified shear rate using a rotational viscometer; And / or, the surface tension is determined using the method specified in GB / T 42415-2023 "Determination of Static Surface Tension of Surfactants".

[0018] Preferred, W wetting The higher the value, the better the wetting performance of the mica tape on the impregnating resin.

[0019] This invention provides a method for testing the wetting performance of epoxy glass powder mica tape on impregnating resin. The testing method of this invention does not require pre-fabrication of stator coil preforms; it only involves testing the raw materials and obtaining parameters through formulas. W wetting This invention provides a simple and rapid evaluation of the wetting performance of mica tape on impregnating resin, directly and quantitatively reflecting the wetting performance of mica tape on impregnating resin. The testing method of this invention is related not only to the physical properties of the mica tape itself, but also to the physical properties of the impregnating resin, thereby achieving an accurate evaluation of the wetting performance of mica tape on impregnating resin.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) This invention proposes for the first time a method that can quickly and easily evaluate the wetting performance of mica tape on impregnating resin, while ensuring the reliability and high accuracy of the test method. (2) The method provided by the present invention can be used to quickly evaluate the wetting performance of mica tape on impregnating resin, and provides guidance for the research, design and application of epoxy glass powder mica tape and impregnating resin for stator coils.

[0021] Obviously, based on the above description of the present invention, and according to common technical knowledge and conventional methods in the field, various other modifications, substitutions, or alterations can be made without departing from the basic technical concept of the present invention.

[0022] The following detailed embodiments further illustrate the above-described content of the present invention. However, this should not be construed as limiting the scope of the present invention to the following examples. All technologies implemented based on the above-described content of the present invention fall within the scope of the present invention. Detailed Implementation

[0023] Unless otherwise specified, all reagents and materials used in the following examples and experimental cases are commercially available.

[0024] Example 1: A test method for the wetting performance of epoxy glass powder mica tape on impregnating resin. This embodiment provides a method for testing the wetting performance of epoxy glass powder mica tape on impregnating resin.

[0025] I. Testing Steps 1. Thermogravimetric analysis was performed on epoxy glass powder mica tapes, and their residual weight at 800℃ was measured. W r The test method shall be carried out in accordance with "GB / T 27761-2011 Test method for weight loss and residual amount of thermogravimetric analyzer"; 2. The specific surface area of ​​the epoxy glass powder mica tape was tested using the Brunauer-Emmett-Teller (BET) method. The measured BET surface area of ​​the epoxy glass powder mica tape was: A BETA The average pore diameters of the epoxy glass powder mica band adsorption process were measured to be as follows: D absorb The test method was carried out in accordance with "GB / T 19587-2017 Determination of Specific Surface Area of ​​Solid Substances by Gas Adsorption BET Method"; 3. In a sealed container, vertically immerse the epoxy glass powder mica strip along its length in the indicator solution, and record the rate of increase in the liquid level on the epoxy glass powder mica strip over time.v absorption The solvent of the indicator solution is diethyl carbonate, the indicator is toluidine red, and the indicator is 1 wt% of the solution mass. 4. Viscosity tests were conducted on the epoxy impregnation resin at different temperatures (room temperature, 50°C, and 80°C). The viscosity of the epoxy impregnation resin at room temperature, 50°C, and 80°C was measured. or RT , or 50 , or 80 The test method was carried out in accordance with "GB / T 21059-2007 Determination of viscosity of polymers / resins in liquid, emulsion or dispersion systems of plastics at specified shear rates using a rotational viscometer"; 5. Surface tension tests were conducted on the epoxy impregnating resin at different temperatures (room temperature, 50°C, and 80°C). The surface tension of the epoxy impregnating resin at room temperature, 50°C, and 80°C was measured. S RT , S 50 , S 80 The test method was carried out in accordance with "GB / T 42415-2023 Determination of Static Surface Tension of Surfactants"; 6. Use the following formula to calculate and obtain the parameters characterizing the wetting properties of glass powder mica tape. W wetting The wetting properties of epoxy impregnation resin in epoxy glass powder mica tape were evaluated. W wetting The larger the value, the better the wetting performance of the epoxy glass powder mica tape on the impregnating resin.

[0026] II. Test Results The test method of this embodiment is applied to determine epoxy glass powder mica banding. A and B Regarding the wetting performance of epoxy impregnating resin, the epoxy impregnating resin used in this embodiment is 1042 imide epoxy resin paint from Xuchang Nacheng Electrical Insulation Materials Co., Ltd., along with epoxy glass powder and mica tape. A and B All are single-sided reinforced epoxy glass powder mica tapes.

[0027] The numerical results of each parameter during the wetting performance test are shown in Table 1.

[0028] Table 1 Results of parameters for testing wetting performance As can be seen from Table 1,W wettingB > W wettingA This indicates that the epoxy glass powder mica band B The wetting properties of epoxy impregnation resin are better than those of epoxy glass powder mica tape. A better.

[0029] III. Compared with experimental results The epoxy glass powder mica tape was wrapped according to the standard manufacturing process for stator coils, and the weight was used to measure its properties. A and B Wetting properties of epoxy impregnation resin.

[0030] First, the initial mass of the stator coil preform was measured. Then, a vacuum impregnation experiment was conducted using epoxy impregnation resin. At regular intervals, the stator coil preform was removed, excess resin was drained, and it was weighed again. The process continued until the mass of the stator coil preform no longer increased, indicating that it had been fully impregnated with the resin. The shorter the time required for this process, the better the wetting performance of the stator coil preform with the impregnation resin. Experimental results show that using epoxy glass powder mica tape... A The manufactured stator coil preforms were fully impregnated with resin for 17.4 hours, using epoxy glass powder mica tape. B The stator coil preform was fully impregnated with resin for 12.9 hours, indicating that the epoxy glass powder mica tape... B The wetting properties of epoxy impregnation resin are better than those of epoxy glass powder mica tape. A better.

[0031] The experimental results are consistent with the results calculated using this embodiment, proving that the test method proposed in this embodiment is accurate.

[0032] Example 2: A method for testing the wetting properties of epoxy glass powder mica tape to impregnating resin. I. Testing Steps The test steps of the test method according to Example 1 are different in that: in step 3, the solvent of the indicator solution is ethyl acetate, the indicator is chromium oxide green, and the indicator is 0.5 wt% of the solution mass.

[0033] II. Test Results The test method of this embodiment is applied to determine epoxy glass powder mica banding. C and D Regarding the wetting performance of epoxy impregnating resin, the epoxy impregnating resin used in this embodiment is JZ-766E H-grade solvent-free impregnating resin from Xuchang Jinzhi Insulation Materials Co., Ltd., along with epoxy glass powder mica tape. C and D All are double-sided reinforced epoxy glass powder mica tapes.

[0034] The numerical results of each parameter during the wetting performance test are shown in Table 2.

[0035] Table 2 Results of parameters for testing wetting performance As shown in Table 2, W wettingC > W wettingD This indicates that the epoxy glass powder mica band C The wetting properties of epoxy impregnation resin are better than those of epoxy glass powder mica tape. D better.

[0036] III. Compared with experimental results The epoxy glass powder mica tape was wrapped according to the standard manufacturing process for stator coils, and the weight was used to measure its properties. C and D Wetting properties of epoxy impregnation resin.

[0037] First, the initial mass of the stator coil preform was measured. Then, a vacuum impregnation experiment was conducted using epoxy impregnation resin. At regular intervals, the stator coil preform was removed, excess resin was drained, and it was weighed again. The process continued until the mass of the stator coil preform no longer increased, indicating that it had been fully impregnated with the resin. The shorter the time required for this process, the better the wetting performance of the stator coil preform with the impregnation resin. Experimental results show that using epoxy glass powder mica tape... C The manufactured stator coil preform was fully impregnated with resin for 29.2 hours, using epoxy glass powder mica tape. D The time required for the manufactured stator coil preform to be fully impregnated with the resin was 33.5 hours, indicating that the epoxy glass powder mica tape... C The wetting properties of epoxy impregnation resin are better than those of epoxy glass powder mica tape. D better.

[0038] The experimental results are consistent with the results calculated using this embodiment, proving that the test method proposed in this embodiment is accurate.

[0039] Example 3: A method for testing the wetting properties of epoxy glass powder mica tape on impregnating resin. I. Testing Steps The test steps of the test method according to Example 1 are different in that: in step 3, the solvent of the indicator solution is xylene.

[0040] II. Test Results The test method of this embodiment is applied to determine epoxy glass powder mica banding. E and FRegarding the wetting performance of epoxy impregnation resin, the epoxy impregnation resin used in this embodiment is Zhuhai Changxian New Material Technology Co., Ltd.'s CX936-1 environmentally friendly water-based high-temperature resistant impregnation resin, along with epoxy glass powder and mica tape. E and F All are three-in-one epoxy glass powder mica tapes.

[0041] The numerical results of each parameter during the wetting performance test are shown in Table 3.

[0042] Table 3 Results of wetting performance test parameters As shown in Table 3, W wettingE > W wettingF This indicates that the epoxy glass powder mica band E The wetting properties of epoxy impregnation resin are better than those of epoxy glass powder mica tape. F better.

[0043] III. Compared with experimental results The epoxy glass powder mica tape was wrapped according to the standard manufacturing process for stator coils, and the weight was used to measure its properties. E and F Wetting properties of epoxy impregnation resin.

[0044] First, the initial mass of the stator coil preform was measured. Then, a vacuum impregnation experiment was conducted using epoxy impregnation resin. At regular intervals, the stator coil preform was removed, excess resin was drained, and it was weighed again. The process continued until the mass of the stator coil preform no longer increased, indicating that it had been fully impregnated with the resin. The shorter the time required for this process, the better the wetting performance of the stator coil preform with the impregnation resin. Experimental results show that using epoxy glass powder mica tape... E The manufactured stator coil preforms were fully impregnated with resin for 18.5 hours, using epoxy glass powder mica tape. F The time required for the manufactured stator coil preform to be fully impregnated with the resin was 26.1 h, indicating that the epoxy glass powder mica tape... E The wetting properties of epoxy impregnation resin are better than those of epoxy glass powder mica tape. F better.

[0045] The experimental results are consistent with the results calculated using this embodiment, proving that the test method proposed in this embodiment is accurate.

[0046] Example 4: A test method for the wetting performance of epoxy glass powder mica tape on impregnating resin. I. Testing Steps The test steps of the test method according to Example 1 are different in that: in step 3, the solvent of the indicator solution is phenol, and the indicator is 0.6 wt% of the solution mass.

[0047] II. Test Results The test method of this embodiment is applied to determine epoxy glass powder mica banding. G and H Regarding the wetting performance of epoxy impregnation resin, the epoxy impregnation resin used in this embodiment is the W2119 series VPI solvent-free impregnation resin from Zhuhai Changxian New Material Technology Co., Ltd., along with epoxy glass powder and mica tape. G and H All are double-sided reinforced epoxy glass powder mica tapes.

[0048] The numerical results of each parameter during the wetting performance test are shown in Table 4.

[0049] Table 4. Parameter results of wetting performance test As shown in Table 4, W wettingH > W wettingG This indicates that the epoxy glass powder mica band H The wetting properties of epoxy impregnation resin are better than those of epoxy glass powder mica tape. G better.

[0050] III. Compared with experimental results The epoxy glass powder mica tape was wrapped according to the standard manufacturing process for stator coils, and the weight was used to measure its properties. G and H Wetting properties of epoxy impregnation resin.

[0051] First, the initial mass of the stator coil preform was measured. Then, a vacuum impregnation experiment was conducted using epoxy impregnation resin. At regular intervals, the stator coil preform was removed, excess resin was drained, and it was weighed again. The process continued until the mass of the stator coil preform no longer increased, indicating that it had been fully impregnated with the resin. The shorter the time required for this process, the better the wetting performance of the stator coil preform with the impregnation resin. Experimental results show that using epoxy glass powder mica tape... G The manufactured stator coil preform was fully impregnated with resin for 33.9 hours, using epoxy glass powder mica tape. H The time required for the manufactured stator coil preform to be fully impregnated with the resin was 27.6 h, indicating that the epoxy glass powder mica tape... H The wetting properties of epoxy impregnation resin are better than those of epoxy glass powder mica tape. G better.

[0052] The experimental results are consistent with the results calculated using this embodiment, proving that the test method proposed in this embodiment is accurate.

[0053] Example 5: A test method for the wetting performance of epoxy glass powder mica tape on impregnating resin. I. Testing Steps The test steps of the test method according to Example 1 are different in that: in step 3, the solvent of the indicator solution is diethyl carbonate, and the indicator is 0.7 wt% of the solution mass.

[0054] II. Test Results The test method of this embodiment is applied to determine epoxy glass powder mica banding. I and J Regarding the wetting performance of epoxy impregnation resin, the epoxy impregnation resin used in this embodiment is W2168 environmentally friendly high-temperature resistant impregnation resin from Zhuhai Changxian New Material Technology Co., Ltd., along with epoxy glass powder and mica tape. I and J All are single-sided reinforced epoxy glass powder mica tapes.

[0055] The numerical results of each parameter during the wetting performance test are shown in Table 5.

[0056] Table 5 Results of parameters for testing wetting performance As shown in Table 5, W wettingI > W wettingJ This indicates that the epoxy glass powder mica band I The wetting properties of epoxy impregnation resin are better than those of epoxy glass powder mica tape. J better.

[0057] III. Compared with experimental results The epoxy glass powder mica tape was wrapped according to the standard manufacturing process for stator coils, and the weight was used to measure its properties. I and J Wetting properties of epoxy impregnation resin.

[0058] First, the initial mass of the stator coil preform was measured. Then, a vacuum impregnation experiment was conducted using epoxy impregnation resin. At regular intervals, the stator coil preform was removed, excess resin was drained, and it was weighed again. The process continued until the mass of the stator coil preform no longer increased, indicating that it had been fully impregnated with the resin. The shorter the time required for this process, the better the wetting performance of the stator coil preform with the impregnation resin. Experimental results show that using epoxy glass powder mica tape... IThe manufactured stator coil preform was fully impregnated with resin for 17.89 hours, using epoxy glass powder mica tape. J The time required for the manufactured stator coil preform to be fully impregnated with the resin was 29.5 hours, indicating that the epoxy glass powder mica tape... I The wetting properties of epoxy impregnation resin are better than those of epoxy glass powder mica tape. J better.

[0059] The experimental results are consistent with the results calculated using this embodiment, proving that the test method proposed in this embodiment is accurate.

[0060] As can be seen from the above embodiments, the present invention provides a method for testing the wetting performance of epoxy glass powder mica tape on impregnating resin. The testing method of the present invention does not require pre-fabrication of stator coil preforms; it only involves testing the raw materials and obtaining parameters through formulas. W wetting This invention provides a simple and rapid evaluation of the wetting performance of mica tape on impregnating resin, directly and quantitatively reflecting the wetting performance of mica tape on impregnating resin. The testing method of this invention is related not only to the physical properties of the mica tape itself but also to the physical properties of the impregnating resin, thus enabling an accurate evaluation of the wetting performance of mica tape on impregnating resin. The testing method provided by this invention offers guidance for the research, design, and application of epoxy glass powder mica tape and impregnating resin for stator coils, and has promising application prospects.

Claims

1. A method for testing the wetting properties of mica tape to impregnating resin, characterized in that, Includes the following steps: Use the following formula to calculate the parameters characterizing the wetting properties of mica strips. W wetting : ； The W r Thermogravimetric analysis was performed on the mica strip to be tested to obtain the residual weight at 600~800℃; The A The specific surface area of ​​the mica strip to be measured is... D The average pore diameter of the mica strip to be measured; The v absorption To vertically immerse the mica strip to be tested in the indicator solution along its length, the rate of increase of the liquid level on the mica strip over time is determined. The η T1 , η T2 , η T3 These are the viscosities of the impregnating resin at T1℃, T2℃, and T3℃, respectively. The S T1 , S T2 , S T3 These represent the surface tensions of the impregnating resin at T1℃, T2℃, and T3℃, respectively. The T1℃ is selected from 18~30℃, the T2℃ is selected from 45~66℃, and the T3℃ is selected from 71~83℃.

2. The method for testing the wetting performance of mica tape to impregnating resin according to claim 1, characterized in that: The mica tape is selected from epoxy glass powder mica tape.

3. The method for testing the wetting performance of mica tape to impregnating resin according to claim 2, characterized in that: The epoxy glass powder mica tape is selected from single-sided reinforced type, double-sided reinforced type, and three-in-one type.

4. The method for testing the wetting performance of mica tape to impregnating resin according to claim 1, characterized in that: The impregnation resin is selected from epoxy impregnation resin.

5. The method for testing the wetting performance of mica tape to impregnating resin according to claim 1, characterized in that: The residual weight is the residual weight at 800°C.

6. The method for testing the wetting performance of mica tape to impregnating resin according to claim 1, characterized in that: The A and D Obtained by specific surface area testing method; and / or, the D It is the average pore diameter during the adsorption process.

7. The method for testing the wetting performance of mica tape to impregnating resin according to claim 1, characterized in that: The indicator in the indicator solution is selected from at least one of toluidine red, chromium oxide green, bromocresol green, neutral red, iron oxide red, pyrrolopyrrole dione red, isoindolinone yellow, and phthalocyanine blue; and / or, the solvent in the indicator solution is selected from at least one of diethyl carbonate, ethyl acetate, xylene, phenol, dimethyl carbonate, ethanol, methanol, acetone, and dimethyl sulfoxide; and / or, the mass fraction of the indicator solution is 0.35-1.69 wt%.

8. The method for testing the wetting performance of mica tape to impregnating resin according to claim 1, characterized in that: The T1℃ is selected from 20-25℃, the T2℃ is 50℃, and the T3℃ is 80℃.

9. The method for testing the wetting performance of mica tape to impregnating resin according to claim 1, characterized in that: The residual weight was measured using the test method for weight loss and remaining amount using a thermogravimetric analyzer, as per GB / T 27761-2011. And / or, the specific surface area is determined using the method of GB / T 19587-2017 Gas Adsorption BET Method for Determining the Specific Surface Area of ​​Solid Substances; And / or, the viscosity is measured using GB / T 21059-2007 Method for determining the viscosity of polymers / resins in liquid, emulsion or dispersion systems of plastics at a specified shear rate using a rotational viscometer; And / or, the surface tension is determined using the method specified in GB / T 42415-2023 "Determination of Static Surface Tension of Surfactants".

10. The method for testing the wetting performance of mica tape to impregnating resin according to claim 1, characterized in that: W wetting The higher the value, the better the wetting performance of the mica tape on the impregnating resin.

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