Motor insulation protective film and method for manufacturing the same

Abstract

The application provides a motor insulation protective film and a preparation method thereof, wherein the motor insulation protective film comprises a PET base layer, a first adhesive layer and a second adhesive layer arranged on the upper and lower surfaces of the PET base layer respectively, a first LCP material layer and a second LCP material layer arranged on the first adhesive layer and the second adhesive layer respectively, and the first LCP material layer and the second LCP material layer are combined on the PET base layer through the first adhesive layer and the second adhesive layer. The LCP material layer is combined on the surface of the PET base layer through the adhesive layer, the excellent physical and chemical properties of the LCP material layer are utilized, the heat resistance, corrosion resistance and electrical insulation of the PET base layer are further improved, and the adaptability of the PET base layer to complex working conditions is stronger, so that the PET base layer is more suitable for the motor field.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to an electric machine insulation protection film and a preparation method thereof. BACKGROUND

[0002] The electric machine insulation protection film is mainly applied to the slot insulation, turn insulation and dense bus slot wrapping of various small and medium-sized electric machines. At present, for the water medium cooling system, the common electric machine insulation protection film is a PET (polyethylene terephthalate) film, which mainly relies on its excellent mechanical properties, good electrical insulation properties, good heat resistance and excellent processability. With the development of new energy vehicles, high-power electric motors often need to use oil medium cooling systems, and the working temperature of the oil medium is often between-25-150℃. Therefore, the traditional PET film will have application risks.

[0003] Therefore, the prior art still needs to be improved and developed. SUMMARY

[0004] The main purpose of the present application is to solve the technical problems mentioned in the background section of the prior art electric machine insulation protection film.

[0005] The content of the present application is as follows:

[0006] The first aspect of the present application provides an electric machine insulation protection film, comprising:

[0007] a PET base layer;

[0008] a first adhesive layer and a second adhesive layer arranged on the upper and lower surfaces of the PET base layer, respectively;

[0009] a first LCP material layer and a second LCP material layer arranged on the first adhesive layer and the second adhesive layer, respectively, and the first LCP material layer and the second LCP material layer are pressure-combined on the PET base layer through the first adhesive layer and the second adhesive layer.

[0010] In an optional embodiment of the first aspect of the present application, the first LCP material layer and the second LCP material layer are both liquid crystal polymers polymerized from hydroquinone, p-hydroxybenzoic acid and 2,6-naphthalene disulfonic acid.

[0011] In an optional embodiment of the first aspect of the present application, the first adhesive layer and the second adhesive layer are both glue layers, and the glue layer is a mixture of one or more of epoxy acrylate, polyacrylonitrile and ethyl acrylate.

[0012] In an alternative implementation of the first aspect of the application, the PET base layer has a thickness of 50-300 μm, a tensile strength of 220-250 MPa, and a melting point of 250-255 °C.

[0013] In an alternative implementation of the first aspect of the application, the first adhesive layer and the second adhesive layer each have a thickness of 2-5 μm.

[0014] In an alternative implementation of the first aspect of the application, the first LCP material layer and the second LCP material layer each have a thickness of 3-100 μm, a tensile strength of 150-200 MPa, and a melting point of 280-340 °C.

[0015] The second aspect of the application provides a method for preparing a motor insulation protection film, comprising:

[0016] providing a PET base layer;

[0017] coating a first adhesive layer and a second adhesive layer on the upper surface and the lower surface of the PET base layer, respectively;

[0018] roll-to-roll laminating a first LCP material layer and a second LCP material layer on the first adhesive layer and the second adhesive layer, respectively, to obtain a motor insulation protection film roll.

[0019] In an alternative implementation of the second aspect of the application, after obtaining the motor insulation protection film roll, the method further comprises:

[0020] cutting the motor insulation protection film roll into motor insulation protection film products of required size specifications.

[0021] In an alternative implementation of the second aspect of the application, after cutting the motor insulation protection film roll into motor insulation protection film products of required size specifications, the method further comprises:

[0022] performing ATF oil resistance performance testing, tensile property testing, and breakdown voltage resistance testing on the motor insulation protection film products.

[0023] In an alternative implementation of the second aspect of the application, the roll-to-roll laminating of the first LCP material layer and the second LCP material layer on the first adhesive layer and the second adhesive layer has a linear speed of 1-2 m / min.

[0024] Beneficial effects: the application provides a motor insulation protection film and a preparation method thereof, wherein the motor insulation protection film comprises a PET base layer; a first adhesive layer and a second adhesive layer are arranged on the upper and lower surfaces of the PET base layer; a first LCP material layer and a second LCP material layer are arranged on the first adhesive layer and the second adhesive layer respectively, and the first LCP material layer and the second LCP material layer are combined on the PET base layer through the first adhesive layer and the second adhesive layer. The LCP material layer is combined on the surface of the PET base layer through the adhesive layer in the application, the excellent physical and chemical properties of the LCP material layer are utilized, the heat resistance, corrosion resistance and electrical insulation of the PET base layer are further improved, and the adaptability of the PET base layer to complex working conditions is stronger, and the application is more suitable for the motor field. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a cross-sectional structure schematic diagram of the motor insulation protection film of the application.

[0026] Figure 2 It is a flow chart of the preparation method of the motor insulation protection film of the application. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and effect of the application more clear and explicit, the application is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the application, and are not used to limit the application.

[0028] Referring to Figure 1 The application provides a motor insulation protection film, comprising:

[0029] The PET base layer 10; in the application, a PET (polyethylene terephthalate) film is used as the base layer, the PET film has good electrical insulation performance, good heat resistance and excellent processability. In an optional embodiment of the application, the thickness of the PET base layer is 50-300 μm, the tensile strength of the PET base layer is 220-250 MPa, and the melting point of the PET base layer is 250-255 ℃.

[0030] The first adhesive layer 20 and the second adhesive layer 30 are arranged on the upper and lower surfaces of the PET base layer 10 respectively; in the application, the first adhesive layer and the second adhesive layer are both glue layers, the glue layer is a mixture of one or more of epoxy acrylate, polyacrylonitrile and ethyl acrylate, for example, the first adhesive layer and the second adhesive layer are both a mixture of epoxy acrylate and polyacrylonitrile, of course, the glue materials used in the first adhesive layer and the second adhesive layer of the application can also be different, for example, the first adhesive layer is a mixture of epoxy acrylate and polyacrylonitrile, and the second adhesive layer is a mixture of polyacrylonitrile and ethyl acrylate; the thickness of the first adhesive layer and the second adhesive layer is 2-5 μm.

[0031] The first LCP material layer 40 and the second LCP material layer 50 are arranged on the first adhesive layer 20 and the second adhesive layer 30 respectively, and the first LCP material layer 40 and the second LCP material layer 50 are laminated on the PET base layer 10 through the first adhesive layer 20 and the second adhesive layer 30. In an optional embodiment of the application, the first LCP material layer and the second LCP material layer are both liquid crystal polymers polymerized from multiple monomers of hydroquinone, terephthalic acid, p-hydroxybenzoic acid, bisphenol A and 2,6-naphthalene disulfonic acid. For example, the first LCP material layer and the second LCP material layer are both liquid crystal polymers polymerized from hydroquinone, p-hydroxybenzoic acid and 2,6-naphthalene acid monomers; the thickness of the first LCP material layer and the second LCP material layer is 3-100 μm, the tensile strength of the first LCP material layer and the second LCP material layer is 150-200 MPa, and the melting point of the first LCP material layer and the second LCP material layer is 280-340℃.

[0032] Liquid crystal polymer (LCP) is an important branch of special engineering plastics, which has excellent physical and chemical properties, including heat resistance (melting point > 300℃), high mechanical strength, creep resistance, high voltage breakdown strength, high dimensional stability, good water vapor barrier property and corrosion resistance, etc. The above-mentioned excellent comprehensive performance makes it possible for LCP film to be applied in the field of motor insulation protection film. The application provides a preparation method of a novel motor insulation protection film, which can realize roll-to-roll production by laminating a commercially available PET film and an ultra-thin LCP film, has low production cost, excellent performance and is suitable for industrial production.

[0033] Referring to Figure 2 The application provides a preparation method of a motor insulation protection film, which comprises the following steps:

[0034] S100, providing a PET base layer; in an optional embodiment of the application, the PET base layer can be a PET roll.

[0035] S200, coating a first adhesive layer and a second adhesive layer on the upper surface and the lower surface of the PET base layer respectively; in the present application, coating a first adhesive layer and a second adhesive layer on the upper surface and the lower surface of the PET base layer respectively can be completed by coating lines.

[0036] S300, roll-to-roll laminating a first LCP material layer and a second LCP material layer on the first adhesive layer and the second adhesive layer respectively to obtain a motor insulation protection film roll; in the present application, the line speed of roll-to-roll laminating a first LCP material layer and a second LCP material layer on the first adhesive layer and the second adhesive layer is 1-2 m / min, for example, 1 m / min.

[0037] In an optional embodiment of the second aspect of the present application, after the roll-to-roll laminating a first LCP material layer and a second LCP material layer on the first adhesive layer and the second adhesive layer respectively to obtain a motor insulation protection film roll, the method further comprises:

[0038] S400, slitting the motor insulation protection film roll into motor insulation protection film products of required size specifications.

[0039] In an optional embodiment of the second aspect of the present application, after the slitting the motor insulation protection film roll into motor insulation protection film products of required size specifications, the method further comprises: performing an ATF oil resistance performance test, a tensile property test and a breakdown voltage resistance test on the motor insulation protection film products.

[0040] In order to better illustrate the effect of the technical scheme of the present application, the following examples and comparative examples are constructed for performance testing.

[0041] <Example 1>: 2-3 μm of epoxy acrylate glue is coated on the A surface / B surface of a 250 μm PET film respectively, and then the A surface / B surface of the above intermediate product is simultaneously roll-pressed and attached with a 10 μm thick LCP film. The line speed of the entire roll-to-roll lamination is 1 m / min. After the lamination is completed, the roll is wound and cut.

[0042] <Example 2>: 2-3 μm of polyacrylonitrile glue is coated on the A surface / B surface of a 250 μm PET film respectively, and then the A surface / B surface of the above intermediate product is simultaneously roll-pressed and attached with a 10 μm thick LCP film. The line speed of the entire roll-to-roll lamination is 1 m / min. After the lamination is completed, the roll is wound and cut.

[0043] Example 3: The A side / B side of the 300 μm PET film was coated with 2-3 μm epoxy acrylate glue, and then the A side / B side of the above intermediate product was simultaneously roll-pressed and bonded with a 10 μm thick LCP film. The line speed of the entire roll-to-roll pressing was 1 m / min. After pressing, the product was wound and cut.

[0044] Comparative Example: A commercially available 250 μm PET film.

[0045] The motor insulation protective films prepared in Examples 1, 2, 3 and the comparative example were subjected to ATF oil resistance performance detection, tensile property and breakdown voltage resistance test according to the following methods, and the results are shown in Table 1.

[0046] 1. ATF oil aging detection

[0047] The sample was placed in commercially available ATF oil, soaked at 150°C for 500 hours, and then the mechanical properties and breakdown voltage of the sample before and after the test were compared.

[0048] 2. Tensile property

[0049] According to the ISO-527-3 standard, the sample was cut into a dumbbell shape with a cutting knife, and the tensile strength and tensile elongation at break were measured. As the test equipment, a C45.102 electronic universal testing machine made by Xinsisi Company was used. The tensile testing machine was used to stretch at a speed of 10 mm / min, and the tensile modulus was calculated.

[0050] 3. Breakdown voltage resistance test

[0051] According to the GB / T1408.1-2016 standard, a DDJ-50KV breakdown voltage instrument was used, brass electrodes were used, and the voltage was rapidly raised at a rate of 1KV / s in transformer oil. The test data of each test is shown in Table 1.

[0052] Table 1: Test performance data of each example and comparative example before and after ATF oil test

[0053]

[0054] As can be seen from the data in Table 1, the motor insulation composite film prepared by the present application has excellent breakdown strength and mechanical properties. After the ATF oil aging test, the breakdown strength and mechanical properties of the motor insulation composite film prepared by the present application do not deteriorate significantly, and still maintain an ideal breakdown strength and mechanical strength after aging. While the comparative example has become brittle and has no mechanical strength after the ATF oil test. The preparation process provided by the present application is simple and feasible, and is a suitable industrial production scheme.

[0055] In summary, the application provides a motor insulation protection film and a preparation method thereof, wherein the motor insulation protection film comprises a PET base layer, a first adhesive layer and a second adhesive layer arranged on the upper and lower surfaces of the PET base layer respectively, a first LCP material layer and a second LCP material layer arranged on the first adhesive layer and the second adhesive layer respectively, and the first LCP material layer and the second LCP material layer are combined on the PET base layer through the first adhesive layer and the second adhesive layer. The LCP material layer is combined on the surface of the PET base layer through the adhesive layer, the excellent physical and chemical properties of the LCP material layer are utilized, the heat resistance, corrosion resistance and electrical insulation of the PET base layer are further improved, and the adaptability of the PET base layer to complex working conditions is stronger, and the PET base layer is more suitable for the motor field.

[0056] The above-described and above-embodied examples are only used to illustrate the technical solutions of the application, rather than limit the same; although the application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the application.

Claims

1. An electric machine insulation protection film, characterized by, The application relates to a motor insulation protection film, which comprises the following steps: a PET base layer is provided; a first adhesive layer and a second adhesive layer are respectively coated on the upper and lower surfaces of the PET base layer; a first LCP material layer and a second LCP material layer are respectively coated on the first adhesive layer and the second adhesive layer, and the first LCP material layer and the second LCP material layer are combined on the PET base layer through the first adhesive layer and the second adhesive layer.

2. The motor insulation protection film according to claim 1, wherein The first LCP material layer and the second LCP material layer are both liquid crystal polymers which are polymerized from hydroquinone, p-hydroxybenzoic acid and 2,6-naphthalene disulfonic acid.

3. The motor insulation protection film of claim 1, wherein, The first adhesive layer and the second adhesive layer are both glue layers, and the glue layer is a mixture of one or more of epoxy acrylate, polyacrylonitrile and ethyl acrylate.

4. The motor insulation protection film of claim 1, wherein, The thickness of the PET base layer is 50-300 mu m, the tensile strength of the PET base layer is 220-250 MPa, and the melting point of the PET base layer is 250-255 DEG C.

5. The motor insulation protection film of claim 1, wherein, The thickness of the first adhesive layer and the second adhesive layer is 2-5 mu m.

6. The motor insulation protection film of claim 1, wherein The thickness of the first LCP material layer and the second LCP material layer is 3-100 mu m, the tensile strength of the first LCP material layer and the second LCP material layer is 150-200 MPa, and the melting point of the first LCP material layer and the second LCP material layer is 280-340 DEG C.

7. A method of producing an electric machine insulation protective film, characterized by, The application relates to a motor insulation protection film, which comprises the following steps: a PET base layer is provided; a first adhesive layer and a second adhesive layer are respectively coated on the upper and lower surfaces of the PET base layer; a first LCP material layer and a second LCP material layer are respectively coated on the first adhesive layer and the second adhesive layer, and the first LCP material layer and the second LCP material layer are combined on the PET base layer through the first adhesive layer and the second adhesive layer.

8. The method of claim 7, wherein the film is applied to the motor by a process selected from the group consisting of spraying, dipping, and brushing. After the motor insulation protection film roll is obtained, the following step is further included: the motor insulation protection film roll is cut into motor insulation protection film products with required size specifications.

9. The method of claim 7, wherein the film is applied to the motor by a process selected from the group consisting of spraying, dipping, and brushing. After the motor insulation protection film roll is cut into motor insulation protection film products with required size specifications, the following step is further included: ​ the motor insulation protection film products are subjected to ATF oil resistance performance testing, tensile property testing and breakdown voltage resistance testing.

10. The method of claim 7, wherein the film is prepared by a process comprising: The line speed of the first LCP material layer and the second LCP material layer coated on the first adhesive layer and the second adhesive layer through roll-to-roll pressing is 1-2 m / min.

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