Insulating mica paper

Abstract

The utility model discloses insulating mica paper which comprises a mica sheet, the inner side of the mica sheet is provided with a first composite anti-tear layer, the first composite anti-tear layer is composed of a first reinforced fiber net, a first anti-tear adhesive layer and a first buffer layer, the outer side of the mica sheet is provided with a second composite anti-tear layer, and the second composite anti-tear layer is composed of a second reinforced fiber net, a second anti-tear adhesive layer and a second buffer layer. The second composite anti-tear layer is composed of a second reinforced fiber net, a second anti-tear adhesive layer and a second buffer layer, a composite flame-retardant layer is arranged on the outer side of the second composite anti-tear layer, and the composite flame-retardant layer is composed of a heat insulation layer and a flame-retardant layer, so that the problem that the insulating mica paper is poor in anti-tear performance is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of mica paper, in particular to insulating mica paper. Background Art

[0002] Mica paper is an insulating material made from high-quality muscovite, phlogopite, synthetic mica or calcined muscovite. Its manufacturing process includes thermochemical or hydraulic stripping and crushing into pulp and papermaking, and then slitting into continuous rolls or single sheets. Mica paper has a series of unique characteristics, such as high temperature resistance, corrosion resistance, insulation, etc., so it is widely used in many fields such as electricity, electronics, aerospace, and construction. Mica paper has excellent high temperature resistance due to the particularity of its raw materials, and can maintain integrity and stability for a long time under high temperature environment. At the same time, it also has good insulation properties, which can effectively isolate cables and wires to prevent electrical faults. It is often used as an insulating material for electrical equipment such as motors, transformers, and cables to ensure the safe and stable operation of the equipment.

[0003] For example, the Chinese authorized patent "An Insulating Powdered Mica Paper" with announcement number CN209779342U includes a mica paper body, which includes a base band, an alkali-free glass fiber cloth is arranged on the inner side of the base band, a mica slurry layer is arranged on the inner side of the alkali-free glass fiber cloth, an anti-tensile rib is arranged on the upper surface of the base band, an anti-puncture layer is arranged on the outer side of the base band, a thermal conductive graphite film is arranged on the outer side of the puncture-proof layer, and an anti-wear layer is arranged on the outer side of the thermal conductive graphite film; through the designed anti-wear layer, anti-puncture layer and anti-tensile ribs, when using the mica paper, the anti-wear layer can prevent wear, the anti-puncture layer can prevent sharp objects from piercing the mica paper, and the anti-tensile ribs can prevent the mica paper from being damaged when pulling the mica paper.

[0004] However, due to the low tensile strength of mica paper itself, it is prone to cracks or even breaks during use, which may greatly reduce its insulation performance and increase the risk of electrical failure. Therefore, it does not meet existing needs. In this regard, we have proposed an insulating mica paper. Utility Model Content

[0005] The utility model aims to provide an insulating mica paper to solve the problem of poor tear resistance of the insulating mica paper mentioned in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an insulating mica paper, comprising a mica sheet, a first composite tear-resistant layer is arranged on the inner side of the mica sheet, the first composite tear-resistant layer is composed of a first reinforcing fiber mesh, a first tear-resistant adhesive layer and a first buffer layer, a second composite tear-resistant layer is arranged on the outer side of the mica sheet, the second composite tear-resistant layer is composed of a second reinforcing fiber mesh, a second tear-resistant adhesive layer and a second buffer layer, a composite flame-retardant layer is arranged on the outer side of the second composite tear-resistant layer, and the composite flame-retardant layer is composed of a heat insulation layer and a flame-retardant layer.

[0007] Preferably, the surface of the mica sheet is provided with a plurality of grooves, and the grooves are evenly distributed, and protrusions are provided between adjacent grooves, and the grooves and protrusions are formed on the surface of the mica sheet by hot pressing.

[0008] Preferably, the first buffer layer is located at the innermost side of the first composite tear-resistant layer, the first reinforcing fiber mesh is located at the outer layer of the first buffer layer, and the first reinforcing fiber mesh and the first buffer layer, as well as the first reinforcing fiber mesh and the inner side of the mica sheet are bonded and fixed by the first tear-resistant adhesive layer.

[0009] Preferably, the second reinforcing fiber mesh is located at the innermost side of the second composite tear-resistant layer, the second buffer layer is located at the outer layer of the second reinforcing fiber mesh, and the mica sheet, the second reinforcing fiber mesh, the second buffer layer and the composite flame-retardant layer are bonded and fixed by a second tear-resistant adhesive layer.

[0010] Preferably, the heat insulation layer is located at the innermost side of the composite flame retardant layer, and the flame retardant layer is coated on the surface of the heat insulation layer.

[0011] Preferably, the thickness of the mica sheet is greater than that of the first composite tear-resistant layer and the second composite tear-resistant layer, and the thickness of the composite flame-retardant layer is less than that of the first composite tear-resistant layer and the second composite tear-resistant layer.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. The utility model increases the contact area between mica paper and other materials or structures by providing grooves and protrusions on the surface of the mica sheet, thereby improving the friction and adhesion between them, which helps to maintain the stability of the mica paper during assembly or use, and reduces the risk of electrical failure caused by sliding or displacement; the surface area of ​​the mica paper is increased, thereby improving the heat dissipation performance to a certain extent. During the operation of electrical equipment, this increased heat dissipation area helps to reduce the temperature of the mica paper and its surrounding components, improve the reliability and stability of the equipment, and increase the mechanical strength of the mica paper to a certain extent. The concave-convex structure can serve as a reinforcement point to disperse external stress and reduce breakage or tearing caused by stress concentration.

[0014] 2. The utility model is provided with a composite tear-resistant layer composed of a reinforced fiber mesh, a tear-resistant adhesive layer and a buffer layer. The addition of the composite tear-resistant layer enables the insulating mica paper to resist greater pulling force when torn by external force, thereby reducing the risk of tearing. The combined effect of the reinforced fiber mesh and the tear-resistant adhesive layer makes the overall structure of the mica paper more stable and able to withstand greater deformation and vibration. By enhancing the tear resistance, the service life of the insulating mica paper is extended and can maintain stable performance in harsh environments. The setting of the buffer layer can effectively alleviate the direct impact of external stress on the mica paper, make the stress distribution more uniform, and reduce the risk of tearing.

[0015] 3. The utility model is provided with a composite flame retardant layer. The flame retardant layer of the composite insulating mica paper can effectively inhibit the spread of flames, reduce the burning speed, and provide a strong guarantee for the safe operation of electrical equipment. The heat insulation material in the flame retardant layer can reduce the transfer of heat to the internal materials, protect electrical components from high temperature damage, and extend the service life of the equipment. The use of environmentally friendly flame retardants and materials meets environmental protection requirements and reduces harm to the environment and human body. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional diagram of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the first composite tear-resistant layer of the utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the second composite tear-resistant layer of the utility model;

[0019] Figure 4 This is a schematic diagram of the composite flame retardant layer structure of the utility model;

[0020] Figure 5 For the utility model Figure 1 A partial enlarged view of area A.

[0021] In the figure: 1. mica sheet; 11. groove; 12. protrusion; 2. first composite tear-resistant layer; 21. first reinforcing fiber mesh; 22. first tear-resistant adhesive layer; 23. first buffer layer; 3. second composite tear-resistant layer; 31. second reinforcing fiber mesh; 32. second tear-resistant adhesive layer; 33. second buffer layer; 4. composite flame-retardant layer; 41. heat-insulating layer; 42. flame-retardant layer. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0023] See also Figure 1-5 The utility model provides an embodiment: an insulating mica paper, including a mica sheet 1, a first composite tear-resistant layer 2 is arranged on the inner side of the mica sheet 1, and the first composite tear-resistant layer 2 is composed of a first reinforcing fiber mesh 21, a first tear-resistant adhesive layer 22 and a first buffer layer 23, a second composite tear-resistant layer 3 is arranged on the outer side of the mica sheet 1, and the second composite tear-resistant layer 3 is composed of a second reinforcing fiber mesh 31, a second tear-resistant adhesive layer 32 and a second buffer layer 33, and a composite flame-retardant layer 4 is arranged on the outer side of the second composite tear-resistant layer 3, and the composite flame-retardant layer 4 is composed of a heat insulation layer 41 and a flame-retardant layer 42.

[0024] The addition of the composite tear-resistant layer enables the insulating mica paper to resist greater tension when torn by external force, reducing the risk of tearing. The combined effect of the reinforced fiber mesh and the tear-resistant adhesive layer makes the overall structure of the mica paper more stable. The composite flame-retardant layer 4 can effectively inhibit the spread of flames and reduce the burning speed, providing a strong guarantee for the safe operation of electrical equipment. The thermal insulation material in the composite flame-retardant layer 4 can reduce the transfer of heat to the internal materials, protect electrical components from high temperature damage, and extend the service life of the equipment.

[0025] See also Figure 5 A plurality of grooves 11 are arranged on the surface of the mica sheet 1, and the grooves 11 are evenly distributed, and protrusions 12 are arranged between adjacent grooves 11. The grooves 11 and the protrusions 12 are formed on the surface of the mica sheet 1 by hot pressing, which increases the contact area between the mica paper and other materials or structures, thereby improving the friction and adhesion between them, helping to maintain the stability of the mica paper during assembly or use, and reducing the risk of electrical failure caused by sliding or displacement; increasing the surface area of ​​the mica paper, thereby improving the heat dissipation performance to a certain extent.

[0026] See also Figure 2 The first buffer layer 23 is located at the innermost side of the first composite tear-resistant layer 2, the first reinforcing fiber mesh 21 is located at the outer layer of the first buffer layer 23, and the first reinforcing fiber mesh 21 and the first buffer layer 23, as well as the first reinforcing fiber mesh 21 and the inner side of the mica sheet 1 are bonded and fixed by the first tear-resistant adhesive layer 22.

[0027] See also Figure 3 The second reinforcing fiber mesh 31 is located at the innermost side of the second composite tear-resistant layer 3, the second buffer layer 33 is located at the outer layer of the second reinforcing fiber mesh 31, and the mica sheet 1, the second reinforcing fiber mesh 31, the second buffer layer 33 and the composite flame-retardant layer 4 are bonded and fixed by the second tear-resistant adhesive layer 32.

[0028] The reinforcing fiber mesh is aramid fiber, which is woven from high-strength, high-modulus fiber materials to form a mesh structure, providing basic tear resistance support for mica paper. Its good mechanical properties and chemical stability can effectively improve the tear resistance of mica paper.

[0029] The tear-resistant adhesive layer is epoxy resin, which has high adhesion and high temperature resistance, and tightly bonds the reinforced fiber mesh and mica paper to form a solid whole;

[0030] The buffer layer is a silicone film to relieve the impact of external stress on the mica paper and prevent tearing.

[0031] See also Figure 4 The heat-insulating layer 41 is located at the innermost side of the composite flame-retardant layer 4, and the flame-retardant layer 42 is coated on the surface of the heat-insulating layer 41. The heat-insulating layer 41 is made of aerogel, a material with excellent heat-insulating properties, which can effectively block the transfer of heat and protect the internal structure. The flame-retardant layer 42 is aluminum hydroxide, which can release non-combustible gas or form a heat-insulating layer when heated, thereby suppressing the spread of flames.

[0032] See also Figure 1 The thickness of the mica sheet 1 is greater than that of the first composite anti-tear layer 2 and the second composite anti-tear layer 3 , and the thickness of the composite flame-retardant layer 4 is less than that of the first composite anti-tear layer 2 and the second composite anti-tear layer 3 .

[0033] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. An insulating mica paper, comprising a mica sheet (1), characterized in that: A first composite tear-resistant layer (2) is arranged on the inner side of the mica sheet (1), the first composite tear-resistant layer (2) being composed of a first reinforcing fiber mesh (21), a first tear-resistant adhesive layer (22) and a first buffer layer (23); a second composite tear-resistant layer (3) is arranged on the outer side of the mica sheet (1), the second composite tear-resistant layer (3) being composed of a second reinforcing fiber mesh (31), a second tear-resistant adhesive layer (32) and a second buffer layer (33); a composite flame-retardant layer (4) is arranged on the outer side of the second composite tear-resistant layer (3), the composite flame-retardant layer (4) being composed of a heat insulation layer (41) and a flame-retardant layer (42).

2. The insulating mica paper according to claim 1, characterized in that: The surface of the mica sheet (1) is provided with a plurality of grooves (11), and the grooves (11) are distributed at equal intervals, and protrusions (12) are provided between adjacent grooves (11), and the grooves (11) and protrusions (12) are formed on the surface of the mica sheet (1) by hot pressing.

3. The insulating mica paper according to claim 1, characterized in that: The first buffer layer (23) is located at the innermost side of the first composite tear-resistant layer (2), the first reinforcing fiber mesh (21) is located at the outer layer of the first buffer layer (23), and the first reinforcing fiber mesh (21) and the first buffer layer (23), as well as the first reinforcing fiber mesh (21) and the inner side of the mica sheet (1) are bonded and fixed via a first tear-resistant adhesive layer (22).

4. The insulating mica paper according to claim 1, characterized in that: The second reinforcing fiber mesh (31) is located at the innermost side of the second composite tear-resistant layer (3), the second buffer layer (33) is located at the outer layer of the second reinforcing fiber mesh (31), and the mica sheet (1), the second reinforcing fiber mesh (31), the second buffer layer (33) and the composite flame-retardant layer (4) are bonded and fixed by a second tear-resistant adhesive layer (32).

5. The insulating mica paper according to claim 1, characterized in that: The heat insulation layer (41) is located at the innermost side of the composite flame retardant layer (4), and the flame retardant layer (42) is coated on the surface of the heat insulation layer (41).

6. The insulating mica paper according to claim 1, characterized in that: The thickness of the mica sheet (1) is greater than that of the first composite tear-resistant layer (2) and the second composite tear-resistant layer (3), and the thickness of the composite flame-retardant layer (4) is less than that of the first composite tear-resistant layer (2) and the second composite tear-resistant layer (3).

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