Flame-retardant hot-melt self-adhesive PET (Polyethylene Terephthalate) film

Abstract

The utility model relates to the technical field of PET (Polyethylene Terephthalate) films, in particular to a flame-retardant hot-melting self-adhesion PET film, which comprises a polyester film layer, a hot adhesive layer, a refractory fiber layer and a carbon composite layer which are sequentially adhered into a whole from inside to outside, and the polyester film layer, the hot adhesive layer, the refractory fiber layer and the carbon composite layer are sequentially adhered into a whole from inside to outside. The cable comprises the polyester film layer, the hot adhesive layer, the fireproof fiber layer and the carbon composite layer, the fireproof fiber layer and the carbon composite layer are bonded up and down, fireproof fibers are high in strength and good in flexibility, the cable can resist high temperature while the cable strength is guaranteed, the carbon composite layer can resist high temperature while the heat dissipation performance is guaranteed, and the service life of the cable is prolonged. The two layers are mutually bonded to achieve good heat-resistant and flame-retardant effects, so that the cable is difficult to burn even when encountering open fire, and the cable can be suitable for different application occasions.

Description

Technical Field:

[0001] The utility model relates to the technical field of PET films, in particular to a flame-retardant hot-melt self-adhesive PET film. Background Art:

[0002] When producing transmission cables, in order to improve the anti-interference performance, a shielding layer is generally required to realize functions such as loop formation and electromagnetic shielding. The common forms of the shielding layer are tape, braid, winding, corrugated pipe or a combination of these forms. The most common form of tape shielding layer is a metal-plastic composite thin tape. The metal-plastic composite thin tape generally has a metal foil tape layer connected to a PET layer through a composite adhesive layer. After being wound around the outer layer of the core wire, a shielding layer is formed. The existing PET layer is generally composed of a single-layer PET film. Ordinary PET belongs to polyester film, which is heat-resistant but not fire-resistant. When encountering an open flame, it is easy to burn, thus damaging the shielding layer structure. Its flame resistance performance is poor, which is not convenient for the use of transmission cables in flammable occasions. Summary of the Utility Model:

[0003] The purpose of the utility model is to provide a flame-retardant hot-melt self-adhesive PET film aiming at the deficiencies of the existing technology. It has strong flame resistance performance and can prevent the cables from being damaged by burning in flammable occasions.

[0004] To achieve the above purpose, the technical solution adopted by the utility model is: a flame-retardant hot-melt self-adhesive PET film, which includes a polyester film layer, a hot melt adhesive layer, a refractory fiber layer, and a carbon composite layer. The polyester film layer, the hot melt adhesive layer, the refractory fiber layer, and the carbon composite layer are sequentially adhered together from the inside to the outside in the order of the polyester film layer, the hot melt adhesive layer, the refractory fiber layer, and the carbon composite layer.

[0005] Further improvement of the above solution is that the thickness of the polyester film is 0.05 - 0.1 mm.

[0006] Further improvement of the above solution is that the hot melt adhesive layer is composed of a thermoplastic hot melt adhesive or a thermosetting hot melt adhesive with a flame retardant grade of UL94V0 or UL94 V1.

[0007] Further improvement of the above solution is that the refractory fiber layer is composed of one of amorphous refractory fibers or polycrystalline refractory fibers.

[0008] Further improvement of the above solution is that the amorphous refractory fiber is one of aluminosilicate refractory fiber and high-aluminum refractory fiber.

[0009] Further improvement of the above solution is that the polycrystalline refractory fiber is one of mullite fiber and alumina fiber.

[0010] A further improvement to the above solution is that the carbon composite layer is formed by laminating several layers of carbon fiber.

[0011] The beneficial effects of the present utility model are as follows: The present utility model provides a flame-retardant hot-melt self-adhesive PET film, which includes a polyester film layer, a hot melt adhesive layer, a refractory fiber layer, and a carbon composite layer. The polyester film layer, the hot melt adhesive layer, the refractory fiber layer, and the carbon composite layer are adhesively fixed together in sequence from the inside to the outside in the order of the polyester film layer, the hot melt adhesive layer, the refractory fiber layer, and the carbon composite layer.

[0012] The present utility model includes a polyester film layer, a hot melt adhesive layer, a refractory fiber layer, and a carbon composite layer. Among them, the refractory fiber layer and the carbon composite layer are adhesively bonded up and down. The refractory fiber has high strength and good flexibility, can withstand high temperatures while ensuring the strength of the cable, and the carbon composite layer can ensure the heat dissipation performance while withstanding high temperatures. The two bonded together can play a good role in heat resistance and flame retardancy, making it difficult for the cable to burn even when encountering an open flame. Secondly, the PET film is bonded by hot melt adhesive, and its thermosetting performance is good, ensuring that the internal structure of the cable will not be damaged and disassembled under high temperature conditions. The polyester film layer ensures the shielding performance and can be applied to different application scenarios. Description of the Drawings:

[0013] Figure 1 It is a schematic cross-sectional structure diagram of the present utility model.

[0014] Description of the reference numerals: Polyester film layer 1, hot melt adhesive layer 2, refractory fiber layer 3, carbon composite layer 4. Detailed Embodiment:

[0015] The following further describes the present utility model with reference to the drawings. As Figure 1 shown, the present utility model includes a flame-retardant hot-melt self-adhesive PET film, which includes a polyester film layer 1, a hot melt adhesive layer 2, a refractory fiber layer 3, and a carbon composite layer 4. The polyester film layer 1, the hot melt adhesive layer 2, the refractory fiber layer 3, and the carbon composite layer 4 are adhesively fixed together in sequence from the inside to the outside in the order of the polyester film layer 1, the hot melt adhesive layer 2, the refractory fiber layer 3, and the carbon composite layer 4. Among them, the refractory fiber layer 3 and the carbon composite layer 4 are adhesively bonded up and down. The refractory fiber has high strength and good flexibility, can withstand high temperatures while ensuring the strength of the cable, and the carbon composite layer 4 can ensure the heat dissipation performance while withstanding high temperatures. The two bonded together can play a good role in heat resistance and flame retardancy, making it difficult for the cable to burn even when encountering an open flame. Secondly, the PET film is bonded by hot melt adhesive, and its thermosetting performance is good, ensuring that the internal structure of the cable will not be damaged and disassembled under high temperature conditions. The polyester film layer 1 ensures the shielding performance and can be applied to different application scenarios.

[0016] The thickness of the polyester film layer 1 of the present utility model is 0.05 - 0.1 mm, which can not only play a good shielding role for the cable, but also has a relatively small overall thickness, enabling better coating on different transmission cables.

[0017] The hot melt adhesive layer 2 of the present utility model is composed of a thermoplastic hot melt adhesive or a thermosetting hot melt adhesive with a flame retardant rating of UL94 V0 or UL94 V1. In this embodiment, the flame retardant rating complies with the UL94 fire protection standard of the 2021 version.

[0018] The refractory fiber layer 3 of the present utility model is composed of either amorphous refractory fiber or polycrystalline refractory fiber. The amorphous refractory fiber has a soft structure and is suitable for application scenarios where the cable needs to be bent; the polycrystalline refractory fiber has a strong structure and is suitable for application scenarios where the cable is not bent, ensuring the flame retardancy of the cable while enhancing the cable strength.

[0019] The amorphous refractory fiber of the present utility model is preferably one of aluminosilicate refractory fiber and high-aluminum refractory fiber.

[0020] The polycrystalline refractory fiber of the present utility model is preferably one of mullite fiber and alumina fiber.

[0021] The carbon composite layer 4 of the present utility model is formed by laminating several layers of carbon fiber. It is easy to manufacture and process, and is difficult to warp, peel, or break. While being resistant to high temperatures, it effectively ensures the structural strength.

[0022] Working principle:

[0023] The present utility model includes a polyester film layer 1, a hot melt adhesive layer 2, a refractory fiber layer 3, and a carbon composite layer 4. Among them, the refractory fiber layer 3 and the carbon composite layer 4 are adhesively bonded up and down. The refractory fiber has high strength and good flexibility, can withstand high temperatures while ensuring the cable strength, and the carbon composite layer 4 can ensure the heat dissipation performance while being resistant to high temperatures. The two adhesively bonded together can play a good role in heat resistance and flame retardancy, making it difficult for the cable to burn even when encountering an open flame. Secondly, the PET film is adhesively bonded through the hot melt adhesive, and its thermosetting performance is good, ensuring that the internal structure of the cable will not be damaged and disassembled under high-temperature conditions. The polyester film layer 1 is arranged on the outermost layer, which can effectively ensure the shielding performance and is applicable to different application scenarios.

[0024] Certainly, the above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made according to the structure, characteristics, and principles described in the scope of the patent application of the present utility model are included in the scope of the patent application of the present utility model.

Claims

1. A flame retardant hot melt self-adhesive PET film, characterized in that: The invention comprises a polyester film layer (1), a hot-adhesive layer (2), a refractory fiber layer (3), and a carbon composite layer (4), wherein the polyester film layer (1), the hot-adhesive layer (2), the refractory fiber layer (3), and the carbon composite layer (4) are sequentially bonded together in the order of the polyester film layer (1), the hot-adhesive layer (2), the refractory fiber layer (3), and the carbon composite layer (4) from the inside to the outside.

2. The flame retardant hot-melt self-adhesive PET film according to claim 1, characterized in that: The thickness of the polyester film layer (1) is 0.05-0.1 mm.

3. The flame retardant hot-melt self-adhesive PET film according to claim 1, characterized in that: The hot glue layer (2) is made of a thermoplastic hot glue or a thermosetting hot glue with a flame retardancy rating of UL94 V0 or UL94 V1.

4. The flame retardant hot-melt self-adhesive PET film according to claim 1, characterized in that: The refractory fiber layer (3) is composed of one of amorphous refractory fibers or polycrystalline refractory fibers.

5. The flame retardant hot-melt self-adhesive PET film according to claim 4, characterized in that: The amorphous refractory fiber is one of aluminum silicate refractory fiber and high aluminum refractory fiber.

6. The flame retardant hot-melt self-adhesive PET film according to claim 4, characterized in that: The polycrystalline refractory fiber is one of mullite fiber and alumina fiber.

7. The flame retardant hot-melt self-adhesive PET film according to claim 1, characterized in that: The carbon composite layer (4) is formed by laminating a plurality of carbon fiber layers.

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