High-temperature-resistant plasticized insulation paper

Abstract

The utility model relates to high-temperature-resistant plasticizing insulation paper which comprises an insulation paper body, and the insulation paper body comprises a base paper layer, a first heat conduction layer, a first bonding layer, a first fireproof layer, a first oil-proof layer, a second heat conduction layer, a second bonding layer, a second fireproof layer and a second oil-proof layer. The first heat conduction layer and the second heat conduction layer are symmetrically attached to the two sides of the base paper layer, the first bonding layer and the second bonding layer are attached to the sides, away from the base paper layer, of the first heat conduction layer and the second heat conduction layer respectively, and the first fireproof layer and the second fireproof layer are attached to the sides, away from the base paper layer, of the first bonding layer and the second bonding layer respectively. By designing the first heat conduction layer and the second heat conduction layer, the heat conduction effect of the insulation paper body is effectively improved, heat can be rapidly conducted in the use process, and the problem that the insulation paper body is prone to being plasticized due to the high temperature effect caused by poor heat conduction and dissipation effects when being located in a high-temperature environment for a long time is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of insulating paper, in particular to a high-temperature resistant plasticized insulating paper. Background Art

[0002] Insulating paper is commonly used as an insulating material for various electrical equipment, including cables and coils. It possesses excellent dielectric properties and high toughness, as well as a certain degree of hardness and resilience. Insulating paper is used in a variety of transformers (including open-ventilated dry-type, cast-coil, and liquid-filled types): for wire wrapping, layer insulation, segment and housing insulation, coil end filler, and separators and rods. Traditional cellulose-based insulating paper, when exposed to high temperatures, can break down its molecular structure, reducing its service life. Furthermore, the paper may burn at high temperatures.

[0003] At present, in order to improve the heat resistance, insulation paper is often subjected to heat-resistant treatment on the surface. For example, patent authorization announcement number CN220585009U is a high-temperature resistant insulation paper for transformers. By setting a high-temperature resistant coating, the insulation paper can have better high-temperature resistance when used inside the transformer.

[0004] However, in actual use, it was discovered that while the insulation paper's high-temperature resistance was improved, it did not conduct heat well when wrapped and applied to the intended location. This prevented heat from being dissipated through the paper in a timely manner, causing the temperature of the surrounding environment to continue to rise. However, there is a limit to the insulation paper's high-temperature resistance. Therefore, due to poor heat conduction and dissipation, the insulation paper is susceptible to plasticization at high temperatures, which limits its service life.

[0005] Therefore, in order to solve the above problems, the applicant needs to design a high-temperature resistant plasticized insulating paper. Utility Model Content

[0006] The purpose of the present utility model is to provide a high-temperature resistant plasticized insulating paper, which can improve the heat resistance while ensuring the heat conduction and heat dissipation effect, thereby avoiding the insulation paper being continuously exposed to ultra-high temperature environments and causing the service life of the insulation paper to be shortened, so as to solve the problems mentioned in the above background technology.

[0007] In order to solve the above technical problems, the utility model provides a high-temperature resistant plasticized insulating paper, including an insulating paper body, wherein the insulating paper body includes a base paper layer, a first heat-conducting layer, a first adhesive layer, a first fireproof layer, a first oil-proof layer, a second heat-conducting layer, a second adhesive layer, a second fireproof layer and a second oil-proof layer, the first heat-conducting layer and the second heat-conducting layer are symmetrically bonded to both sides of the base paper layer, the first heat-conducting layer and the second heat-conducting layer are respectively bonded to the first adhesive layer and the second adhesive layer on the side away from the base paper layer, the first adhesive layer and the second adhesive layer are respectively bonded to the first fireproof layer and the second fireproof layer on the side away from the base paper layer, and the first fireproof layer and the second fireproof layer are respectively bonded to the first oil-proof layer and the second oil-proof layer on the side away from the base paper layer.

[0008] Under the action of the first heat-conducting layer and the second heat-conducting layer, the heat dissipation capacity of the insulating paper body in a high-temperature environment can be improved, overheating can be prevented from damaging the paper itself or its supporting materials, and the heat resistance and thermal stability of the paper can be enhanced; under the action of the first adhesive layer and the second adhesive layer, the strength and durability of the insulating paper body can be improved, effectively preventing the paper from being torn and damaged during use, and enhancing the adhesion between the base paper layer and the first heat-conducting layer and the second heat-conducting layer; under the action of the first fireproof layer and the second fireproof layer, the heat resistance of the insulating paper body can be effectively improved, thereby avoiding damage to the insulating paper body in a certain high-temperature environment, extending the service life of the insulating paper body and maintaining its structural integrity; under the action of the first oil-proof layer and the second oil-proof layer, the base material used for the internal insulating paper body can be protected by the oil-proof layer to avoid deformation after oil absorption.

[0009] The interior of the base paper layer is filled with alumina fiber filaments and silica fiber strips, and the alumina fiber filaments and silica fiber strips are arranged in an interlaced manner.

[0010] Alumina fiber filaments and silica fiber strips can withstand extremely high temperatures and maintain high strength and stability even at high temperatures. Compared with metal materials, alumina fiber filaments are lighter, so filling them in the base paper layer can not only improve the high-temperature plasticizing effect of the base paper layer, but also effectively improve the structural strength of the insulating paper itself.

[0011] The first heat-conducting layer and the second heat-conducting layer both include a polyamide resin sheet, aluminum heat-conducting wires, and copper powder particles. The aluminum heat-conducting wires are evenly spaced inside the polyamide resin sheet, and the copper powder particles are filled inside the polyamide resin sheet.

[0012] The polyamide resin sheet has excellent thermal conductivity and wear resistance, can maintain its performance at higher temperatures, and is easy to process and shape. Combined with the aluminum thermal wire and copper powder particles added internally, the thermal conductivity of the first and second thermal conductive layers is further enhanced, allowing the insulating paper body to quickly conduct heat during use, which is conducive to rapid heat dissipation and avoids the insulating paper body being in a high-temperature environment for a long time.

[0013] The first bonding layer and the second bonding layer both include a polyurethane sheet, carbon fiber filaments and aramid fiber filaments. The carbon fiber filaments and aramid fiber filaments are both filled inside the polyurethane sheet, and the carbon fiber filaments and aramid fiber filaments are interlaced with each other.

[0014] The polyurethane sheet can absorb and cushion impact, has good elasticity and toughness, can withstand large deformation without easily breaking, and is easy to process. When used in the insulating paper body, it is convenient to tightly connect adjacent interlayers and improve the toughness and strength of the insulating paper body.

[0015] The first fireproof layer and the second fireproof layer both include aluminum hydroxide sheets and silicone resin sheets. The silicone resin sheets are symmetrically attached to both sides of the aluminum hydroxide sheets, and the interiors of the aluminum hydroxide sheets and the silicone resin sheets are both filled with glass fiber yarns.

[0016] Aluminum hydroxide sheet is a thin sheet material made of aluminum hydroxide (Al(OH)3), which can effectively improve the flame retardant properties of the material. Due to its low thermal conductivity, which interferes with the insulation paper body, the thickness of the aluminum hydroxide sheet is set to 0.1mm, and the main fireproof effect is provided by the silicone resin sheet.

[0017] The first oil-proof layer and the second oil-proof layer both include a fluorine compound coating and a polypropylene film. The fluorine compound coating is bonded to the first fireproof layer or the second fireproof layer through an aqueous fluoride additive. The polypropylene film is arranged on the side of the fluorine compound coating away from the base paper layer, and an adhesive layer is bonded to the surface of the polypropylene film.

[0018] Fluorine compound coatings can maintain stability at higher temperatures, are not easily decomposed or lose performance, and can withstand temperatures as high as 300°C. Due to their very smooth surface and low surface energy, fluorine compound coatings can effectively prevent the adhesion of oil and other pollutants, keeping the surface clean. They can maintain their oil-proof properties at higher temperatures and will not deteriorate or fail due to high temperatures. This provides better protection for the internal base material of the insulation paper body in high-temperature environments.

[0019] The beneficial effects of the present invention are:

[0020] 1. The utility model effectively improves the thermal conductivity of the insulating paper body by designing the first thermal conductive layer and the second thermal conductive layer, so that the insulating paper body can quickly conduct heat during use, which is conducive to rapid heat dissipation and avoids the problem of plasticization of the insulating paper body due to poor heat conduction and heat dissipation in a high temperature environment for a long time.

[0021] 2. The utility model designs the first adhesive layer and the second adhesive layer. Since the polyurethane sheet can absorb and buffer impact force, has good elasticity and toughness, and is easy to process, it is applied to the insulating paper body to facilitate the close connection of adjacent interlayers and improve the density, toughness and strength of the insulating paper body.

[0022] 3. The utility model provides a fireproof effect for the insulating paper body without significantly affecting the thickness of the insulating paper body by arranging a first fireproof layer, a second fireproof layer, a first oil-proof layer and a second oil-proof layer, thereby improving the high-temperature resistance of the insulating paper body. In addition, the first oil-proof layer and the second oil-proof layer can provide a better protection effect on the internal base material of the insulating paper body in a high-temperature environment, effectively preventing the insulating paper body from being deformed due to long-term immersion in hydraulic oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This is a front view of a preferred embodiment of the present invention in a wound state;

[0025] Figure 2 It is a cross-sectional view of a preferred embodiment of the present utility model in an expanded state;

[0026] Figure 3 Schematic diagram of the structure of the base paper layer of the preferred embodiment of the present utility model;

[0027] Figure 4 Schematic diagram of the structure of the first heat-conducting layer and the second heat-conducting layer in a preferred embodiment of the present invention;

[0028] Figure 5 Schematic diagram of the structure of the first adhesive layer and the second adhesive layer of a preferred embodiment of the present invention;

[0029] Figure 6 Schematic diagram of the structure of the first fireproof layer and the second fireproof layer of the preferred embodiment of the present invention;

[0030] Figure 7 It is a schematic structural diagram of the first oil-proof layer and the second oil-proof layer in a preferred embodiment of the present utility model.

[0031] In the figure: 1. Insulating paper body; 11. Base paper layer; 111. Alumina fiber filaments; 112. Silica fiber strips; 12. First thermal conductive layer; 121. Polyamide resin sheet; 122. Aluminum thermal conductive wire; 123. Copper powder particles; 13. First bonding layer; 131. Polyurethane sheet; 132. Carbon fiber filaments; 133. Aramid fiber filaments; 14. First fireproof layer; 141. Aluminum hydroxide sheet; 142. Silicone resin sheet; 143. Glass fiber filaments; 15. First oil-proof layer; 151. Fluorochemical coating; 152. Polypropylene film; 153. Adhesive layer; 16. Second thermal conductive layer; 17. Second bonding layer; 18. Second fireproof layer; 19. Second oil-proof layer. DETAILED DESCRIPTION

[0032] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0033] like Figure 1-Figure 7 As shown, the utility model provides a high-temperature resistant plasticized insulating paper, including an insulating paper body 1, the insulating paper body 1 includes a base paper layer 11, a first heat-conducting layer 12, a first adhesive layer 13, a first fireproof layer 14, a first oil-proof layer 15, a second heat-conducting layer 16, a second adhesive layer 17, a second fireproof layer 18 and a second oil-proof layer 19, the first heat-conducting layer 12 and the second heat-conducting layer 16 are symmetrically attached to both sides of the base paper layer 11, under the action of the first heat-conducting layer 12 and the second heat-conducting layer 16, the heat dissipation capacity of the insulating paper body 1 in a high-temperature environment can be improved, and damage to the paper itself or its supporting material caused by overheating can be prevented, thereby enhancing the heat resistance and thermal stability of the paper; the first heat-conducting layer 12 and the second heat-conducting layer 16 are respectively attached to the side away from the base paper layer 11 with the first adhesive layer 13 and the second adhesive layer 17, under the action of the first adhesive layer 13 and the second adhesive layer 17, the heat dissipation of the insulating paper body 1 can be improved. The strength and durability of the insulating paper body 1 can be improved, effectively preventing the paper from being torn and damaged during use, and enhancing the adhesion between the base paper layer 11 and the first heat-conducting layer 12 and the second heat-conducting layer 16; the first adhesive layer 13 and the second adhesive layer 17 are respectively adhered to the first fireproof layer 14 and the second fireproof layer 18 on the side away from the base paper layer 11. Under the action of the first fireproof layer 14 and the second fireproof layer 18, the heat resistance of the insulating paper body 1 can be effectively improved, thereby avoiding damage to the insulating paper body 1 in a certain high-temperature environment, extending the service life of the insulating paper body 1 and maintaining its structural integrity; the first fireproof layer 14 and the second fireproof layer 18 are respectively adhered to the first oil-proof layer 15 and the second oil-proof layer 19 on the side away from the base paper layer 11. Under the action of the first oil-proof layer 15 and the second oil-proof layer 19, the base material used for the internal insulating paper body 1 can be protected by the oil-proof layer to avoid deformation after oil absorption.

[0034] Reference Figure 3 The interior of the base paper layer 11 is filled with alumina fiber filaments 111 and silica fiber strips 112. The alumina fiber filaments 111 and the silica fiber strips 112 are arranged in an interlaced manner. The alumina fiber filaments 111 and the silica fiber strips 112 are distributed along the warp direction and the weft direction, respectively, to form a mesh structure; the alumina fiber filaments 111 and the silica fiber strips 112 can withstand extremely high temperatures and maintain high strength and stability even at high temperatures. Compared with metal materials, the alumina fiber filaments 111 are lighter, so filling them in the base paper layer 11 can not only improve the high-temperature resistant plasticizing effect of the base paper layer 11, but also effectively improve the structural strength of the insulating paper body 1.

[0035] Reference Figure 4 The first heat-conducting layer 12 and the second heat-conducting layer 16 both include a polyamide resin sheet 121, an aluminum heat-conducting wire 122 and copper powder particles 123. The aluminum heat-conducting wire 122 is evenly spaced inside the polyamide resin sheet 121, and the copper powder particles 123 are filled inside the polyamide resin sheet 121. The polyamide resin sheet 121 has excellent thermal conductivity and wear resistance, can maintain performance at high temperatures, and is easy to process and shape. Combined with the internally added aluminum heat-conducting wire 122 and copper powder particles 123, the thermal conductivity of the first heat-conducting layer 12 and the second heat-conducting layer 16 is further fully improved, so that the insulating paper body 1 can quickly conduct heat during use, which is conducive to rapid heat dissipation and avoids the insulating paper body 1 being in a high-temperature environment for a long time.

[0036] Reference Figure 5 The first bonding layer 13 and the second bonding layer 17 both include a polyurethane sheet 131, carbon fiber filaments 132 and aramid fiber filaments 133. The carbon fiber filaments 132 and aramid fiber filaments 133 are both filled inside the polyurethane sheet 131, and the carbon fiber filaments 132 and aramid fiber filaments 133 are staggered with each other; the polyurethane sheet 131 can absorb and buffer impact force, has good elasticity and toughness, can withstand large deformation without being easily broken, and is easy to process. When used in the insulating paper body 1, it is convenient to tightly connect adjacent interlayers and improve the toughness and strength of the insulating paper body 1.

[0037] Reference Figure 6 The first fireproof layer 14 and the second fireproof layer 18 both include aluminum hydroxide sheets 141 and silicone resin sheets 142. The silicone resin sheets 142 are symmetrically attached to both sides of the aluminum hydroxide sheets 141, and the interiors of the aluminum hydroxide sheets 141 and the silicone resin sheets 142 are filled with glass fiber yarns 143; the aluminum hydroxide sheet 141 is a thin sheet material made of aluminum hydroxide (Al(OH)3), which can effectively improve the flame retardant properties of the material. Due to its low thermal conductivity, it interferes with the insulating paper body 1. The thickness of the aluminum hydroxide sheet 141 is set to 0.1 mm, and the main fireproof effect is provided by the silicone resin sheet 142.

[0038] Reference Figure 7 The first oil-proof layer 15 and the second oil-proof layer 19 both include a fluorine compound coating 151 and a polypropylene film 152. The fluorine compound coating 151 is adhered to the first fireproof layer 14 or the second fireproof layer 18 through an aqueous fluoride additive. The polypropylene film 152 is arranged on the side of the fluorine compound coating 151 away from the base paper layer 11, and an adhesive layer 153 is adhered to the surface of the polypropylene film 152; the fluorine compound coating 151 can maintain stability at higher temperatures, is not easy to decompose or lose performance, and can withstand temperatures as high as 300°C. Due to its very smooth surface and low surface energy, the fluorine compound coating 151 can effectively prevent the adhesion of oil and other pollutants, keep the surface clean, and maintain its oil-proof performance at higher temperatures. It will not deteriorate or fail due to high temperature, thereby providing better protection for the internal base material of the insulating paper body 1 in a high temperature environment.

[0039] Working principle: During processing, a certain proportion of alumina fiber filaments 111 and silica fiber strips 112 are added to the pulp raw materials used for the base paper layer 11, and then the base paper layer 11 is impregnated with resin to ensure the strength of the base paper layer 11. Subsequently, aluminum thermal conductive wires 122 and copper powder particles 123 are added to the polyamide resin liquid and mixed thoroughly before thin slices are prepared. The prepared first thermal conductive layer 12 and the second thermal conductive layer 16 are respectively attached to both sides of the base paper layer 11, and the polyurethane sheet 131 with carbon fiber filaments 132 and aramid fiber filaments 133 inside is sliced to form a uniform thickness. After the thin film is formed evenly, the first adhesive layer and the second adhesive layer are respectively adhered between the first heat conductive layer 12 and the first fireproof layer 14 and between the second heat conductive layer 16 and the second fireproof layer 18. When preparing the first fireproof layer 14 and the second fireproof layer 18, the silicone resin sheet 142 is adhered to both sides of the aluminum hydroxide sheet 141 by hot pressing, and the silicone resin sheet 142 is tightly adhered to the adjacent polyurethane sheet 131 by heat treatment. When adhering the first oil-proof layer 15 and the second oil-proof layer 19, it is necessary to control the adhesive layer 153 to be located on the outside of the insulating paper body 1.

[0040] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, but must be determined according to the scope of the claims.

Claims

1. A high temperature resistant plasticized insulating paper, characterized by: The invention comprises an insulating paper body (1), wherein the insulating paper body (1) comprises a base paper layer (11), a first heat-conducting layer (12), a first adhesive layer (13), a first fireproof layer (14), a first oil-proof layer (15), a second heat-conducting layer (16), a second adhesive layer (17), a second fireproof layer (18) and a second oil-proof layer (19), wherein the first heat-conducting layer (12) and the second heat-conducting layer (16) are symmetrically bonded to both sides of the base paper layer (11), the first adhesive layer (13) and the second adhesive layer (17) are bonded to the sides of the first heat-conducting layer (12) and the second heat-conducting layer (16) away from the base paper layer (11), the first fireproof layer (14) and the second fireproof layer (18) are bonded to the sides of the first adhesive layer (13) and the second adhesive layer away from the base paper layer (11), and the first oil-proof layer (15) and the second oil-proof layer (19) are bonded to the sides of the first fireproof layer (14) and the second fireproof layer (18) away from the base paper layer (11).

2. The high temperature resistant plasticized insulating paper according to claim 1, characterized in that: The interior of the base paper layer (11) is filled with alumina fiber filaments (111) and silica fiber strips (112), and the alumina fiber filaments (111) and silica fiber strips (112) are arranged in an interlaced manner.

3. The high temperature resistant plasticized insulating paper according to claim 1, characterized in that: The first heat-conducting layer (12) and the second heat-conducting layer (16) both comprise a polyamide resin sheet (121), aluminum heat-conducting wires (122) and copper powder particles (123); the aluminum heat-conducting wires (122) are evenly spaced and distributed inside the polyamide resin sheet (121); and the copper powder particles (123) are filled inside the polyamide resin sheet (121).

4. The high temperature resistant plasticized insulating paper according to claim 3, characterized in that: The first bonding layer (13) and the second bonding layer both comprise a polyurethane sheet (131), carbon fiber filaments (132) and aramid fiber filaments (133); the carbon fiber filaments (132) and aramid fiber filaments (133) are both filled inside the polyurethane sheet (131), and the carbon fiber filaments (132) and aramid fiber filaments (133) are interlaced with each other.

5. The high temperature resistant plasticized insulating paper according to claim 3, characterized in that: The first fireproof layer (14) and the second fireproof layer (18) both include an aluminum hydroxide sheet (141) and a silicone resin sheet (142), wherein the silicone resin sheet (142) is symmetrically attached to both sides of the aluminum hydroxide sheet (141), and the interiors of the aluminum hydroxide sheet (141) and the silicone resin sheet (142) are both filled with glass fiber yarns (143).

6. The high temperature resistant plasticized insulating paper according to claim 3, characterized in that: The first oil-proof layer (15) and the second oil-proof layer (19) both comprise a fluorine compound coating (151) and a polypropylene film (152); the fluorine compound coating (151) is adhered to the first fireproof layer (14) or the second fireproof layer (18) via an aqueous fluoride additive.

7. The high temperature resistant plasticized insulating paper according to claim 6, characterized in that: The polypropylene film (152) is arranged on the side of the fluorine compound coating (151) away from the base paper layer (11), and an adhesive layer (153) is attached to the surface of the polypropylene film (152).

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