A multi-layer reinforced composite mica tape

Abstract

This invention discloses a multi-layer reinforced composite mica tape, comprising a first mica paper layer and a second mica paper layer as the surface layer. The widths of the first and second mica paper layers are the same, matching the width of the composite mica tape and allowing for trimming allowances. An intermediate layer is formed between the first and second mica paper layers. The intermediate layer is a combination of a polyimide film layer and a strip of carbon fiber cloth. The width of the polyimide film layer is 50-70% of the width of the composite mica tape and is formed in the center. The strip of carbon fiber cloth forms both sides of the polyimide film. A fiber reinforcement layer is formed between the intermediate layer and the first and / or the second mica paper layers. This invention significantly improves the physical properties of the mica tape, meeting the higher requirements of electrical equipment for insulating materials.

Description

Technical Field

[0001] The utility model relates to the technical field of insulating materials, in particular to a multi-layer reinforced composite mica tape with better physical properties. Background Art

[0002] In recent years, the application of insulating materials in electrical equipment has also attracted people's attention. Mica tape is a kind of insulating wrapping material. It uses mica paper of paper-based insulating material as functional material and alkali-free glass cloth or film reinforcement as reinforcement material. After lamination, hot pressing, baking, winding and cutting, it is made into a coiled tape insulating material; it is used as an insulating material in electronic equipment such as cables, transformers, motors, and relays.

[0003] With the advancement of technology and the improvement of people's requirements for electrical performance, higher requirements have been placed on the performance of mica tapes. The strength defects of existing mica tapes have become a major obstacle to their application. At present, the strength defects of mica tapes are mainly caused by the superposition of unavoidable factors in the formation, mining and processing of mica raw materials. If the strength of the mica tape is too low, it is easy to crack or even break during use, which will greatly reduce the fire resistance and insulation of the mica tape, which may affect the normal operation of the equipment. In severe cases, it may also cause the wires or components inside the equipment to be exposed, causing short circuits or other electrical failures; if the mica tape breaks in high-voltage equipment, it may cause dangerous situations such as arc flash or electric shock.

[0004] Therefore, in order to ensure the normal operation and safe use of electrical equipment, it is necessary to structurally strengthen the existing mica tape structure to ensure that it meets the relevant standards and requirements. Utility Model Content

[0005] The technical problem solved by the utility model is to provide a multi-layer reinforced composite mica tape to solve the shortcomings of the above-mentioned background technology.

[0006] The technical problem solved by the utility model is achieved by the following technical solutions:

[0007] A multi-layer reinforced composite mica tape comprises a first mica paper layer and a second mica paper layer as a surface layer, wherein the width of the first mica paper layer is consistent with that of the second mica paper layer, matches the width of the composite mica tape and has a reserved margin for trimming; an intermediate layer is formed between the first mica paper layer and the second mica paper layer; the intermediate layer is a combination of a polyimide film layer and a strip-shaped carbon fiber cloth, the width of the polyimide film layer is 50-70% of the width of the composite mica tape, is formed in the middle, and the strip-shaped carbon fiber cloth is formed on both sides of the polyimide film; a fiber reinforcement layer is formed between the intermediate layer and the first mica paper layer and / or between the second mica paper layer.

[0008] As a further limitation, the composite mica tape is composited with a phenolic epoxy tungsten maleic anhydride adhesive to form an interlayer structure;

[0009] The coating amount of the phenolic epoxy anhydride adhesive is controlled between 60 and 150 g per square meter.

[0010] As a further limitation, the thickness of the first mica paper layer and the second mica paper layer is 0.05-0.07 mm; and the thickness of the composite mica tape is 0.15-0.25 mm.

[0011] As a further limitation, the thickness of the polyimide film layer in the intermediate layer is consistent with that of the strip-shaped carbon fiber cloth, and the gap between the polyimide film layer and the strip-shaped carbon fiber cloth is less than 2 mm.

[0012] As a further limitation, the fiber reinforcement layer is made of alkali-free glass fiber cloth when it is arranged on one side.

[0013] As a further limitation, the fiber-reinforced layer, when arranged on both sides, adopts a mesh structure woven from glass fibers or ceramic fibers, and the mesh size thereof is 0.5 to 1.0 mm.

[0014] As a further limitation, an interface reinforcement layer is formed between the intermediate layer and the fiber reinforcement layer, and the interface reinforcement layer is chopped glass fibers uniformly dispersed between the interface of the intermediate layer and the fiber reinforcement layer.

[0015] Beneficial effects: The multi-layer reinforced composite mica tape of the utility model not only increases the structural stability of the mica tape, but also improves its electrical performance under high temperature and high pressure environments by introducing a polyimide film layer and a strip carbon fiber cloth as an intermediate layer; at the same time, the addition of the fiber reinforcement layer can effectively improve the physical properties of the mica tape, especially its tensile strength and tear strength, and prevent cracks and breakages that may occur during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a preferred embodiment of the utility model.

[0017] Wherein: 1. first mica paper layer; 2. fiber reinforcement layer; 3. ribbon carbon fiber cloth; 4. polyimide film layer; 5. second mica paper layer. DETAILED DESCRIPTION

[0018] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below with reference to specific illustrations.

[0019] See also Figure 1A preferred embodiment of a multi-layer reinforced composite mica tape is provided. In this embodiment, the multi-layer reinforced composite mica tape comprises a first mica paper layer 1 and a second mica paper layer 5 as surface layers. The two mica paper layers have a consistent width, matching the total width of the composite mica tape, and a certain trimming margin is reserved to facilitate cutting and adjustment in practical applications.

[0020] The thickness of the first mica paper layer 1 and the second mica paper layer 5 is set to be in the range of 0.05 to 0.07 mm to provide sufficient insulation and fireproofing properties.

[0021] Phenolic epoxy tungsten maleic anhydride adhesive is applied between the first mica paper layer 1 and the second mica paper layer 5 to achieve adhesion and compounding of the interlayer structure; and in order to ensure a firm bond between the layers while avoiding excessive adhesive affecting the electrical properties of the mica tape, the coating amount of the corresponding phenolic epoxy tungsten maleic anhydride adhesive is controlled between 60 and 150 g per square meter.

[0022] Between the first mica paper layer 1 and the second mica paper layer 5, an intermediate layer is formed, which is composed of a polyimide film layer 4 and a strip-shaped carbon fiber cloth 3; the width of the polyimide film layer 4 is set to 50-70% of the width of the composite mica tape and is located in the middle, and the strip-shaped carbon fiber cloth 3 is formed on both sides of the polyimide film layer 4, and the thickness of the polyimide film layer 4 and the strip-shaped carbon fiber cloth 3 are consistent to ensure that in the stacked state, when composited with the first mica paper layer 1 and the second mica paper layer 5, they have better surface flatness, so as to have better fit during operation; the corresponding gap between the polyimide film layer 4 and the strip-shaped carbon fiber cloth 3 should be less than 2mm. The combination of the first mica paper layer 1 and the second mica paper layer 5 can be used to improve the structural strength and electrical properties of the composite mica tape.

[0023] A fiber-reinforced layer 2 is formed between the middle layer and the first mica paper layer 1 and / or between the second mica paper layer 5. The fiber-reinforced layer 2 is formed in different ways in different embodiments:

[0024] In this embodiment, the fiber reinforced layer 2 is unilaterally formed between the first mica paper layer 1 and the middle layer. Under this technical condition, the fiber reinforced layer 2 is an alkali-free glass fiber cloth, and the fiber reinforced layer 2 can be formed between the middle layer and the first mica paper layer 1 or between the middle layer and the second mica paper layer 5.

[0025] In another embodiment, if the fiber reinforced layer 2 is formed on both sides of the middle layer, that is, a fiber reinforced layer 2 is formed between the middle layer and the first mica paper layer 1 and between the middle layer and the second mica paper layer 5; under this technical condition, the fiber reinforced layer 2 is a mesh structure woven from glass fiber or ceramic fiber with a mesh size of 0.5 to 1.0 mm.

[0026] Generally speaking, the mica medium in the mica paper used to prepare the mica tape will inevitably have impurities and defects during the formation and mining process, such as natural defects such as bubbles, spots, and ripples, and processing defects such as burrs, marginal delamination, folded corners, abrasions and punctures during the processing of the mica paper. In this embodiment, the strip-shaped carbon fiber cloth 3 has high modulus, high strength and good thermal stability. Its combination with the fiber reinforcement layer 2 can effectively fill and enhance the above defects. The middle layer with the polyimide film layer can improve the physical properties of the mica tape while ensuring the electrical properties of the mica tape, especially its tensile strength and tear strength, and prevent cracks and breakages that may occur during use; and can effectively suppress the warping of the edges of the strip-shaped carbon fiber cloth 3 after bonding.

[0027] In another embodiment, if the physical strength of the mica tape needs to be further improved, an interface reinforcement layer can be formed between the intermediate layer and the fiber reinforced layer 2. When setting the interface reinforcement layer, the chopped glass fibers need to be evenly dispersed in the interface area between the intermediate layer and the fiber reinforced layer 2. The amount used should not affect the performance of the viscose layer.

[0028] Through the above structural design and composite process, the thickness of the multi-layer reinforced composite mica tape is controlled within the range of 0.15-0.25 mm to meet the requirements for the thickness of the mica tape in practical applications, ensuring that it has good permeability, high tensile strength and good density.

[0029] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A multi-layer reinforced composite mica tape, characterized in that: The invention comprises a first mica paper layer and a second mica paper layer as surface layers, wherein the widths of the first mica paper layer and the second mica paper layer are consistent, match the width of the composite mica tape and reserve a margin for trimming; an intermediate layer is formed between the first mica paper layer and the second mica paper layer; the intermediate layer is a combination of a polyimide film layer and a strip-shaped carbon fiber cloth, the width of the polyimide film layer is 50-70% of the width of the composite mica tape and is formed in the middle position, and the strip-shaped carbon fiber cloth is formed on both sides of the polyimide film; a fiber reinforcement layer is formed between the intermediate layer and the first mica paper layer and / or between the second mica paper layer.

2. The multi-layer reinforced composite mica tape according to claim 1, characterized in that: The composite mica tape is composited with phenolic epoxy tungsten maleic anhydride adhesive to form an interlayer structure.

3. The multi-layer reinforced composite mica tape according to claim 2, characterized in that: The coating amount of the phenolic epoxy anhydride adhesive is controlled between 60 and 150 g per square meter.

4. The multi-layer reinforced composite mica tape according to claim 1, characterized in that: The thickness of the first mica paper layer and the second mica paper layer is 0.05-0.07 mm; and the thickness of the composite mica tape is 0.15-0.25 mm.

5. The multi-layer reinforced composite mica tape according to claim 1, characterized in that: The thickness of the polyimide film layer in the intermediate layer is consistent with that of the strip-shaped carbon fiber cloth, and the gap between the polyimide film layer and the strip-shaped carbon fiber cloth is less than 2 mm.

6. The multi-layer reinforced composite mica tape according to claim 1, characterized in that: The fiber reinforcement layer is made of alkali-free glass fiber cloth when it is arranged on one side.

7. The multi-layer reinforced composite mica tape according to claim 1, characterized in that: The fiber-reinforced layer adopts a mesh structure woven from glass fiber or ceramic fiber when it is arranged on both sides, and the mesh size is 0.5-1.0 mm.

8. The multi-layer reinforced composite mica tape according to claim 1, characterized in that: An interface reinforcement layer is also formed between the intermediate layer and the fiber reinforcement layer. The interface reinforcement layer is short-cut glass fibers uniformly dispersed between the interface of the intermediate layer and the fiber reinforcement layer.

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