Composite insulation paper for motor

Abstract

The utility model discloses composite insulation paper for a motor. Relates to the technical field of insulating materials. Comprising a PEN layer, two fiber paper layers, an adhesive layer and a polytetrafluoroethylene layer, the two polytetrafluoroethylene layers are adhered to the PEN layer by the two fiber paper layers through the two adhesive layers. The polytetrafluoroethylene layer is arranged on the surface of the PEN layer, and the high chemical stability of a carbon-fluorine bond of the polytetrafluoroethylene layer is utilized, so that the chemical corrosion resistance of the material is remarkably enhanced, the composite insulation paper is stable for a long time in complex media such as cooling oil, acid and alkali, performance degradation caused by chemical corrosion of the composite insulation paper in the scheme is prevented, and the long-term reliability of a motor in a severe environment is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of insulating material, specifically to a composite insulating paper for motor. BACKGROUND

[0002] As a key material in the motor, the insulating paper is usually composed of multiple layers to provide mechanical support and electrical insulation performance. However, in the harsh operating environment of the motor, the surface characteristics of the existing insulating paper still have certain limitations:

[0003] 1. First, the chemical stability of the surface of the insulating paper is poor, and when it is in contact with cooling oil, acid and alkali and other media for a long time, it may decompose or its performance may deteriorate, affecting its electrical insulation effect;

[0004] 2. Secondly, the surface friction coefficient is high, and wear and heat accumulation are likely to occur during dynamic operation of the motor, reducing the service life of the material;

[0005] 3. In addition, the surface energy of the insulating paper is high, and it is easy to adsorb oil stains and dust, resulting in surface contamination, which affects the electrical performance and operating stability. These problems significantly limit the application of the insulating paper in complex environments, especially in the field of high-performance motors, and there is an urgent need to solve the above problems by a composite insulating paper for motor. SUMMARY

[0006] The purpose of the present application is to provide a technical solution to solve the problems raised in the background art.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solution:

[0008] A composite insulating paper for motor, comprising a PEN layer, two layers of fiber paper layer, an adhesive layer and a polytetrafluoroethylene layer; the two layers of fiber paper layer are adhered to the PEN layer by the two layers of adhesive layer and the two layers of polytetrafluoroethylene layer.

[0009] Preferably, the polytetrafluoroethylene layer is a surface-activated polytetrafluoroethylene layer.

[0010] Preferably, the fiber paper layer is one of aramid paper layer or Nomex paper layer.

[0011] Preferably, the adhesive layer is one of epoxy adhesive layer or polyurethane layer.

[0012] Preferably, the thickness of the PEN layer is 25um-350um.

[0013] Preferably, the adhesive layer is a polyurethane adhesive layer.

[0014] Preferably, the thickness of the polyurethane adhesive layer is 5um-30um.

[0015] Preferably, the polytetrafluoroethylene layer is a surface plasma or sodium treated polytetrafluoroethylene layer.

[0016] In summary, the technical effects and advantages of the present application are:

[0017] 1. By setting a polytetrafluoroethylene (PTFE) layer on the surface of the PEN layer, the high chemical stability (bond energy up to 485 kJ / mol) of the carbon-fluorine bond (C-F bond) is utilized to significantly enhance the chemical corrosion resistance of the material. In complex media such as cooling oil, acid and base, it can be stable for a long time, preventing the performance degradation of the composite insulating paper caused by chemical erosion, thereby ensuring the long-term reliability of the motor in harsh environments.

[0018] 2. The composite insulating paper of the present application is provided with a polytetrafluoroethylene (PTFE) layer, which has a very low friction coefficient (about 0.05-0.10) and a highly crystallized molecular structure on its surface, which can significantly reduce friction and heat accumulation in dynamic mechanical environment, forming a lasting friction-reducing protection. By reducing friction heat and mechanical loss, the service life of the insulating paper under high-speed motor operating conditions is extended, and the system operating efficiency is improved.

[0019] 3. The composite insulating paper of the present application has very low surface energy (about 18 mN / m) and shielding effect of molecular surface fluorine atoms, excellent hydrophobic and oleophobic properties (contact angle can reach more than 110°), which can effectively prevent dust, oil stains and other pollutants from adhering to the surface of the insulating paper, keeping it clean during long-term use, and further improving the stability and reliability of the insulating performance. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiment or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0021] Figure 1 The present application is a sectional view.

[0022] Reference numerals in the drawing: 1 PEN layer; 2 fiber paper layer; 3 adhesive layer; 4 polytetrafluoroethylene layer. DETAILED DESCRIPTION

[0023] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0024] As shown in the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application. Figure 1 The motor composite insulation paper comprises a PEN layer 1, two fiber paper layers 2, an adhesive layer 3, and a polytetrafluoroethylene layer 4. The two fiber paper layers 2 are adhered to the PEN layer 1 through the two adhesive layers 3 and the two polytetrafluoroethylene layers 4. By arranging the polytetrafluoroethylene (PTFE) layer 4 on the surface of the polyethylene naphthalate (PEN) layer 1, the high chemical stability (bond energy up to 485 kJ / mol) of the carbon-fluorine bond (C-F bond) is utilized to significantly enhance the chemical corrosion resistance of the material, and the composite insulation paper is stable in complex media such as cooling oil and acid and alkali for a long time, thereby preventing the performance degradation of the composite insulation paper caused by chemical erosion, and ensuring the long-term reliability of the motor in harsh environments. The composite insulation paper of the present application is provided with a polytetrafluoroethylene (PTFE) layer 4, which has a very low friction coefficient (about 0.05-0.10) and a highly crystallized molecular structure, and can significantly reduce friction and heat accumulation in a dynamic mechanical environment, thereby forming a long-lasting friction-reducing protection. By reducing friction heat and mechanical loss, the service life of the insulation paper under high-speed motor operating conditions is prolonged, and the system operating efficiency is improved. The composite insulation paper of the present application is provided with a polytetrafluoroethylene (PTFE) layer 4, which has a very low surface energy (about 18 mN / m) and a shielding effect of fluorine atoms on the molecular surface, and has excellent hydrophobic and oleophobic properties (contact angle can reach more than 110°), which can effectively prevent dust, oil stains and other pollutants from adhering to the surface of the insulation paper, so that the insulation paper can maintain a clean state during long-term use, and the stability and reliability of the insulation performance are further improved.

[0025] Further, the polytetrafluoroethylene layer 4 is a polytetrafluoroethylene layer with surface activation treatment. The polytetrafluoroethylene layer 4 has the property of being adhered to the surface of the polyethylene naphthalate (PEN) layer 1. Specifically, the polytetrafluoroethylene layer 4 is a polytetrafluoroethylene layer 4 with surface plasma or sodium treatment.

[0026] Further, the fiber paper layer 2 is one of aramid paper layer or Nomex paper layer. The user can select according to the needs, so as to adapt to industrial motors or motors of new energy vehicles.

[0027] Further, the adhesive layer 3 is one of an epoxy adhesive layer and a polyurethane adhesive layer; in particular, the adhesive layer 3 is a polyurethane adhesive layer. The polyurethane adhesive layer has the characteristic of UV rapid photocuring, and when the present scheme is realized as a product, the yield can be greatly improved. Further, the thickness of the polyurethane adhesive layer is 5-30 um, which can be adaptively adjusted according to user requirements.

[0028] Further, the thickness of the PEN layer 1 is 25-350 um, which can be adaptively adjusted according to user requirements.

[0029] Finally, it should be noted that the above only describes preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or equivalently replace some of the technical features, and any modification, equivalent replacement or improvement made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A composite insulation paper for electric machines, characterized by: It comprises a PEN layer, two layers of fiber paper layer, adhesive layer, and two layers of polytetrafluoroethylene layer; the two layers of fiber paper layer are adhered to the PEN layer through the two layers of adhesive layer and the two layers of polytetrafluoroethylene layer.

2. The composite insulation paper for electric machines according to claim 1, characterized in that: The polytetrafluoroethylene layer is a surface-activated polytetrafluoroethylene layer.

3. The composite insulation paper for electric machines according to claim 1, characterized in that: The fiber paper layer is one of aramid paper layer or Nomex paper layer.

4. The composite insulation paper for electric machines according to claim 1, characterized in that: The adhesive layer is one of epoxy adhesive layer or polyurethane layer.

5. The composite insulation paper for electric machines according to claim 1, characterized in that: The thickness of the PEN layer is 25-350 um.

6. The composite insulation paper for electric machines according to claim 4, characterized in that: The adhesive layer is a polyurethane adhesive layer.

7. The composite insulation paper for electric machines according to claim 6, characterized in that: The thickness of the polyurethane adhesive layer is 5-30 um.

8. The composite insulation paper for electric machines according to claim 2, characterized in that: The polytetrafluoroethylene layer is a surface-plasma or sodium-activated polytetrafluoroethylene layer.

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