Fiber reinforced anti-bending mica paper

Abstract

The utility model discloses fiber reinforced anti-bending mica paper which comprises base layer mica paper, first surface layer mica paper and second surface layer mica paper, a first insulation reinforcing film layer and a second insulation reinforcing film layer are formed on the two sides of the base layer mica paper respectively. A first fiber reinforced net surface is arranged outside the first insulation reinforced film layer, and the outer side is sealed by first surface layer mica paper; and a second fiber-reinforced net surface is arranged outside the second insulating reinforced film layer, and the outer side is sealed by second surface layer mica paper. The two fiber reinforced net surfaces are both woven by high-strength fibers, each net surface is provided with rhombus-grid-shaped meshes, the proportion of long diagonal lines to short diagonal lines is 5: 1-15: 1, and the long diagonal lines and the short diagonal lines of the rhombus-grid-shaped meshes of the two net surfaces are perpendicular to each other. According to the utility model, by introducing innovative designs such as the fiber reinforced net surface and the insulation reinforced film layer, the anti-bending capability and the comprehensive performance are obviously improved, and a more reliable and safer insulation material choice is provided for power equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of insulating materials, in particular to a fiber-reinforced anti-bending mica paper. Background Art

[0002] Mica paper is a paper-based insulating material. Made from mica, it is formed by hot chemical or hydraulic stripping and crushing into pulp and then papermaking. It has excellent electrical properties, high-temperature resistance and chemical stability, and is widely used as an insulating material in electrical equipment such as motors, transformers, and generators.

[0003] Generally speaking, mica paper itself has high flexibility, which is convenient for secondary processing to manufacture various-shaped insulating parts. However, its anti-bending performance is poor. In some specific application environments, such as occasions that require frequent bending or bear large mechanical stresses, the anti-bending performance of mica paper is insufficient. It is easy to deform or even break in insulating parts with complex shapes or that require multiple bends, which may affect its insulating effect and service life in electrical equipment.

[0004] To solve this problem, it is necessary to improve on the basis of mica paper and develop a fiber-reinforced anti-bending mica paper. Summary of the Utility Model

[0005] The technical problem solved by the utility model is to provide a fiber-reinforced anti-bending mica paper to solve the defects in the above technical background.

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

[0007] A fiber-reinforced anti-bending mica paper, comprising a base mica paper, a first surface mica paper and a second surface mica paper;

[0008] On both sides of the base mica paper, a first insulating reinforcement film layer and a second insulating reinforcement film layer are respectively formed; on the surface of the first insulating reinforcement film layer, a first fiber reinforcement mesh surface is formed, and the first surface mica paper is used for surface closure outside the first fiber reinforcement mesh surface; on the surface of the second insulating reinforcement film layer, a second fiber reinforcement mesh surface is formed, and the second surface mica paper is used for surface closure outside the second fiber reinforcement mesh surface;

[0009] Both the first fiber reinforcement mesh surface and the second fiber reinforcement mesh surface are mesh surfaces woven from high-strength fibers. The mesh surface has rhomboid mesh holes. The ratio of the length of the long diagonal to the length of the short diagonal of the rhomboid mesh holes is 5:1 to 15:1, and the long diagonals and short diagonals of the rhomboid mesh holes on the first fiber reinforcement mesh surface and the second fiber reinforcement mesh surface are perpendicular to each other.

[0010] As a further limitation, the base mica paper is phlogopite paper or muscovite paper or synthetic mica paper, and its thickness is 0.1 - 0.5 mm; the surface mica paper is thin phlogopite paper, and its thickness is 0.05 - 0.2 mm; and the proportion of the base mica paper and the surface mica paper in the thickness of the fiber-reinforced anti-bending mica paper is 60% - 80%.

[0011] As a further limitation, the mica particle size in the mica slurry used in the base mica paper is 60 - 120 μm; the mica particle size in the mica slurry used in the surface mica paper is 30 - 60 μm.

[0012] As a further limitation, the first insulating reinforcing film layer and the second insulating reinforcing film layer are polyimide film layers or polytetrafluoroethylene film layers.

[0013] As a further limitation, the first insulating reinforcing film layer and the second insulating reinforcing film layer are aluminum oxide film layers.

[0014] As a further limitation, the fiber raw material for weaving the first fiber-reinforced mesh surface and the second fiber-reinforced mesh surface is one or a combination of aramid fiber and acetate fiber.

[0015] As a further limitation, the single-hole area size of the mesh holes on the first fiber-reinforced mesh surface and the second fiber-reinforced mesh surface is 1 - 10 mm 2 , and the mesh holes are evenly distributed.

[0016] As a further limitation, a chopped-strand reinforcing fiber layer is formed at the interface position between the first fiber-reinforced mesh surface and the first insulating reinforcing film layer and / or between the second fiber-reinforced mesh surface and the second insulating reinforcing film layer, and the chopped-strand reinforcing fiber layer is formed by uniformly dispersing impregnated chopped meta-aramid fibers at the corresponding interface position and then pressing and molding.

[0017] As a further limitation, a nano-aluminum hydroxide particle layer is formed at the interface position between the first fiber-reinforced mesh surface and the first surface mica paper and / or between the second fiber-reinforced mesh surface and the second surface mica paper.

[0018] As a further limitation, a waterproof coating is applied on the outer surface of the first surface mica paper and / or the second surface mica paper, and the waterproof coating is a polysiloxane waterproof coating or a fluorocarbon resin waterproof coating.

[0019] Beneficial effects: On the basis of maintaining the original excellent electrical properties, high-temperature resistance and chemical stability of the mica paper, the fiber-reinforced anti-bending mica paper of the present utility model greatly enhances its anti-bending ability by introducing a fiber-reinforced mesh surface with a diamond-shaped mesh structure and an insulating reinforcement film layer, enabling the mica paper to still maintain a stable insulating effect and service life in an environment of frequent bending or under greater mechanical stress; at the same time, the fiber-reinforced mesh surface can also improve the air permeability and heat dissipation performance of the mica paper, further enhancing the comprehensive performance of the mica paper. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of a preferred embodiment of the present utility model.

[0021] Wherein: 1. First surface layer mica paper; 2. First nano-aluminum hydroxide particle layer; 3. First fiber-reinforced mesh surface; 4. First short-cut reinforced fiber layer; 5. First insulating reinforcement film layer; 6. Base mica paper; 7. Second insulating reinforcement film layer; 8. Second short-cut reinforced fiber layer; 9. Second fiber-reinforced mesh surface; 10. Second nano-aluminum hydroxide particle layer; 11. Second surface layer mica paper. Detailed Embodiments

[0022] In order to make the technical means, creative features, achieved purposes and effects of the present utility model easy to understand, the present utility model will be further described below with reference to specific drawings.

[0023] See Figure 1 A preferred embodiment of a fiber-reinforced anti-bending mica paper. In this embodiment, the fiber-reinforced anti-bending mica paper is a multi-layer composite structure, and each structural layer is formed by hot pressing after applying glue. The glue used is an epoxy resin glue with high temperature resistance and excellent electrical properties.

[0024] In this embodiment, the base mica paper 6 serves as the main body of the entire structure and is formed by using phlogopite paper with a thickness of 0.4 mm. The two surfaces of the base mica paper 6 are respectively covered with a first insulating reinforcement film layer 5 and a second insulating reinforcement film layer 7. Both the first insulating reinforcement film layer 5 and the second insulating reinforcement film layer 7 are formed by high-strength insulating film materials, which can be the same film material or different film materials; in different embodiments, a polyimide film layer or a polytetrafluoroethylene film layer in the polymer film or an aluminum oxide film layer in the inorganic metal oxide film can be used; specifically in this embodiment, both the first insulating reinforcement film layer 5 and the second insulating reinforcement film layer 7 are polyimide film layers, which not only have excellent insulating properties but also can provide additional overall mechanical strength for the formed finished mica paper.

[0025] On the surface of the first insulating and reinforcing film layer 5, a first fiber-reinforced mesh surface 3 is formed. The first fiber-reinforced mesh surface 3 is woven from high-strength aramid fibers, and the mesh surface presents a rhombic mesh hole structure with uniform distribution. The area of a single mesh hole is 8 mm 2 , and the ratio of the length of the long diagonal to the short diagonal of a single mesh hole is 10:1. Such a mesh hole structure not only ensures the strength of the fiber-reinforced mesh surface but also endows it with certain flexibility and breathability.

[0026] On the outer side of the first fiber-reinforced mesh surface 3, a thin mica paper is used as the first surface mica paper 1, and its thickness is 0.1 mm, which is used to seal and protect the first fiber-reinforced mesh surface 3.

[0027] Similarly, on the surface of the second insulating and reinforcing film layer 7, a second fiber-reinforced mesh surface 9 is formed. The structure of the second fiber-reinforced mesh surface 9 is the same as the material and form of the first fiber-reinforced mesh surface 3. The only difference is that the long diagonals and short diagonals of the rhombic mesh holes on the first fiber-reinforced mesh surface 3 and the second fiber-reinforced mesh surface 9 are perpendicular to each other; that is, when the first fiber-reinforced mesh surface 3 is integrally laid horizontally on the surface of the first insulating and reinforcing film layer 7, the corresponding second fiber-reinforced mesh surface 9 is integrally laid vertically on the surface of the second insulating and reinforcing film layer 7.

[0028] On the outer side of the second fiber-reinforced mesh surface 9, the same thin mica paper is used as the second surface mica paper 11, which is used to seal and protect the second fiber-reinforced mesh surface 9; the thickness of the thin mica paper corresponding to the first surface mica paper 1 and the second surface mica paper 11 is 0.1 mm.

[0029] Compared with the base mica paper 6, the first surface mica paper 1 and the second surface mica paper 11 are used to adapt to the undulation of the fiber-reinforced mesh surface and to obtain better mica paper surface properties, and to ensure the overall uniformity and consistency.

[0030] The mica particle size in the mica slurry used in the base mica paper 6 is 60 - 120 μm to ensure that the base mica paper 6 has sufficient mechanical strength and electrical properties. While the mica particle size in the mica slurry used in the first surface mica paper 1 and the second surface mica paper 11 is smaller, being 30 - 60 μm. Such a particle size selection helps to improve the fineness and flexibility of the mica paper while maintaining excellent electrical properties. The proportion of the base mica paper 6 and the first surface mica paper 1 and the second surface mica paper 11 on both sides in the overall thickness of the fiber-reinforced anti-bending mica paper is 65%, and the remaining 35% is shared by the first insulating reinforcement film layer 5, the second insulating reinforcement film layer 7, the first fiber-reinforced mesh surface 3, the second fiber-reinforced mesh surface 9, the first nano-aluminum hydroxide particle layer 2, the second nano-aluminum hydroxide particle layer 10, the first chopped-strand reinforcement fiber layer 4, and the second chopped-strand reinforcement fiber layer 8 and other reinforcing and auxiliary structure layers and adhesive layers, thereby ensuring the overall performance and stability of the fiber-reinforced anti-bending mica paper.

[0031] In addition, in order to further enhance the bonding force between the fiber-reinforced mesh surface and the mica paper and improve the anti-bending performance of the mica paper, nano-aluminum hydroxide particle layers (i.e., the first nano-aluminum hydroxide particle layer 2 and the second nano-aluminum hydroxide particle layer 10) are respectively provided between the first fiber-reinforced mesh surface 3 and the first surface mica paper 1, and between the second fiber-reinforced mesh surface 9 and the second surface mica paper 11. These nano-aluminum hydroxide particle layers not only enhance the bonding force of the interface by making the aluminum hydroxide particles evenly distributed on the interface, but also improve the high-temperature resistance, electrical stability, and flame retardancy of the mica paper.

[0032] Between the first fiber-reinforced mesh surface 3 and the first insulating reinforcement film layer 5, and between the second fiber-reinforced mesh surface 9 and the second insulating reinforcement film layer 7, chopped-strand reinforcement fiber layers (i.e., the first chopped-strand reinforcement fiber layer 4 and the second chopped-strand reinforcement fiber layer 8) are also respectively provided. These chopped-strand reinforcement fiber layers are mainly formed by uniformly dispersing impregnated chopped meta-aramid fibers at the interface position and then compressing them, significantly enhancing the connection strength between the fiber-reinforced mesh surface and the insulating reinforcement film layer, thereby further improving the overall anti-bending ability and mechanical strength of the mica paper.

[0033] In another embodiment, the overall waterproof performance of the formed fiber-reinforced anti-bending mica paper can also be improved by respectively coating a layer of polysiloxane waterproof coating on the outer surfaces of the first surface mica paper 1 and the second surface mica paper 11, making it have excellent water resistance and weather resistance.

[0034] The basic principles, main features and advantages of the present utility model have been shown and described above. Those skilled in the art of this industry should understand that the use of these embodiments is only for illustrating the present utility model rather than intending to limit the protection scope of the present utility model. In addition, it should also be understood that after reading the technical content of the present utility model, those skilled in the art can make various changes, modifications and / or variations to the present utility model, and all these equivalent forms also fall within the protection scope defined by the appended claims of this application.

Claims

1. A fiber-reinforced anti-bending mica paper, characterized in that, It includes a base mica paper, a first surface mica paper, and a second surface mica paper; On both side surfaces of the base mica paper, a first insulation reinforcement film layer and a second insulation reinforcement film layer are respectively formed; on the surface of the first insulation reinforcement film layer, a first fiber reinforcement mesh surface is formed, and the outside of the first fiber reinforcement mesh surface is surface-sealed with the first surface mica paper; on the surface of the second insulation reinforcement film layer, a second fiber reinforcement mesh surface is formed, and the outside of the second fiber reinforcement mesh surface is surface-sealed with the second surface mica paper; Both the first fiber reinforcement mesh surface and the second fiber reinforcement mesh surface are mesh surfaces woven from high-strength fibers. The mesh surface has rhomboid mesh holes. The ratio of the length of the long diagonal to the length of the short diagonal of the rhomboid mesh holes is 5:1 to 15:1, and the long diagonals and short diagonals of the rhomboid mesh holes on the first fiber reinforcement mesh surface and the second fiber reinforcement mesh surface are perpendicular to each other.

2. The fiber-reinforced anti-bending mica paper according to claim 1, wherein The base mica paper is phlogopite paper or muscovite paper or synthetic mica paper, and its thickness is 0.1 - 0.5 mm; the surface mica paper is thin phlogopite paper, and its thickness is 0.05 - 0.2 mm; and the proportion of the base mica paper and the surface mica paper in the thickness of the fiber-reinforced anti-bending mica paper is 60% - 80%.

3. The fiber-reinforced anti-bending mica paper according to claim 1, wherein The mica particle size in the mica slurry used in the base mica paper is 60 - 120 μm; the mica particle size in the mica slurry used in the surface mica paper is 30 - 60 μm.

4. The fiber-reinforced anti-bending mica paper according to claim 1, characterized in that, The first insulation reinforcement film layer and the second insulation reinforcement film layer are polyimide film layers or polytetrafluoroethylene film layers.

5. The fiber-reinforced anti-bending mica paper according to claim 1, wherein The first insulation reinforcement film layer and the second insulation reinforcement film layer are aluminum oxide film layers.

6. The fiber-reinforced anti-bending mica paper according to claim 1, characterized in that, The single-hole area of the mesh holes on the first fiber reinforcement mesh surface and the second fiber reinforcement mesh surface is 1 - 10 mm², and the mesh holes are evenly distributed.

7. The fiber-reinforced anti-bending mica paper according to claim 1, wherein At the interface position between the first fiber reinforcement mesh surface and the first insulation reinforcement film layer and / or between the second fiber reinforcement mesh surface and the second insulation reinforcement film layer, a chopped-strand reinforcement fiber layer is formed. The chopped-strand reinforcement fiber layer is formed by uniformly dispersing impregnated chopped meta-aramid fibers at the corresponding interface position and then pressing and molding.

8. The fiber-reinforced anti-bending mica paper according to claim 1, characterized in that, At the interface position between the first fiber reinforcement mesh surface and the first surface mica paper and / or between the second fiber reinforcement mesh surface and the second surface mica paper, a nano-aluminum hydroxide particle layer is formed.

9. The fiber-reinforced anti-bending mica paper according to claim 1, characterized in that, On the outer surface of the first surface mica paper and / or the second surface mica paper, a waterproof coating is applied. The waterproof coating is a polysiloxane waterproof coating or a fluorocarbon resin waterproof coating.

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