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A fire-resistant and flame-retardant rail transit communication cable

A technology for rail transit and communication cables, applied in the direction of communication cables, insulated cables, cables, etc., can solve the problems of large attenuation changes of optical fibers, loss of the function of transmitting information, and the inability of the flame-retardant sheath to effectively block heat transfer. Effects of reducing heat, maintaining luminosity, and promoting rearrangement of ions

Active Publication Date: 2018-10-02
JIANGSU HENGTONG WIRE & CABLE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the fire-resistant performance of the commonly used rail transit communication cables is mainly improved by flame-retardant improvement of the outer sheath of the cable. The flame-retardant sheath cannot effectively block heat transfer. The heat will penetrate into the optical fiber and other materials with the passage of time and the high temperature of the fire. The fiber is heated and the attenuation changes greatly. It is difficult for the optical cable to maintain the smooth communication of the optical fiber for a long time. Therefore, rail transit communication cables can no longer rely solely on low-smoke halogen-free sheath materials to maintain their fire resistance

Method used

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  • A fire-resistant and flame-retardant rail transit communication cable
  • A fire-resistant and flame-retardant rail transit communication cable
  • A fire-resistant and flame-retardant rail transit communication cable

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] refer to figure 1 As shown, the structure of the communication cable in Example 1 includes from the outside to the inside: a low-smoke, halogen-free outer sheath 10, a first refractory layer 20, a high magnetic permeability steel tape armor layer 30, a low-smoke, halogen-free inner sheath Sheath 40, second refractory layer 50, aluminum sheath 60, PE heat insulation layer 70, water blocking layer 80, several strands of stranded insulating core wires 90, the above stranded insulating core wires 90 are covered by wrapping polyester tape 100 The grease 101 is filled between the stranded insulating core wire 90 and the wrapping polyester tape 100 , and the stranded insulating core wire 90 is covered with an insulating layer.

[0031] The communication cable of this embodiment has a double-layer fire-resistant layer in structure, and the structure is from the outside to the inside, and the layers are flame-retardant. The outer sheath can absorb most of the heat. The first fir...

Embodiment 2

[0042] The structure of the communication cable in Embodiment 2 is the same as in Embodiment 1, wherein the above-mentioned low-smoke, halogen-free outer sheath 10 and low-smoke, halogen-free inner sheath 40 are both low-smoke, halogen-free polyethylene materials, calculated in parts by weight , the formulation of the above-mentioned low-smoke halogen-free polyethylene material is shown in Table 3.

[0043] Low-smoke halogen-free polyethylene material formula table in the embodiment 2 of table 3

[0044] components

Content (parts by weight)

polyethylene

85

Phosphorous Flame Retardant Plasticizer BDP

7

Compatibilizer PE-g-MAH

20

Ammonium polyphosphate

20

expandable graphite

40

[0045]Among them, in the above formula, the weight ratio of ammonium polyphosphate to expandable graphite is 1:3, ammonium polyphosphate and expandable graphite are synergistically flame-retardant in low-smoke halogen-free polyethylene ...

Embodiment 3

[0053] The structure of the communication cable in Embodiment 3 is the same as that in Embodiment 1, wherein the above-mentioned low-smoke, halogen-free outer sheath 10 and low-smoke, halogen-free inner sheath 40 are both low-smoke, halogen-free polyethylene materials, calculated in parts by weight , the formulation of the above-mentioned low-smoke halogen-free polyethylene material is shown in Table 5.

[0054] The low-smoke halogen-free polyethylene material formula table in the embodiment 3 of table 5

[0055] components

Content (parts by weight)

polyethylene

90

Phosphorous Flame Retardant Plasticizer BDP

10

Compatibilizer PE-g-MAH

25

Ammonium polyphosphate

30

expandable graphite

60

[0056] Among them, in the above formula, the weight ratio of ammonium polyphosphate to expandable graphite is 1:3, ammonium polyphosphate and expandable graphite are synergistically flame-retardant in low-smoke halogen-free po...

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Abstract

The invention discloses a fire-resistant and flame-retardant rail transit communication cable, which includes: a low-smoke halogen-free outer sheath, a first fire-resistant layer, a high-magnetic conductive steel tape armor layer, a low-smoke halogen-free inner sheath, a second fire-resistant layer, aluminum sheath, PE insulation layer, water-blocking layer, and several strands of twisted insulated core wires. The formula of the low-smoke halogen-free polyethylene material includes: 80-90 parts of polyethylene, phosphorus-based flame retardant plasticizer BDP 5-10 parts, PE-g-MAH 15-25 parts, ammonium polyphosphate 10-30 parts, expandable graphite, 30-60 parts; the second refractory layer is a refractory silicone rubber material, and the formula of the refractory silicone rubber material includes : 30-100 parts of methyl vinyl silicone rubber, 4-15 parts of porcelain powder, 1-4 parts of rigid mineral powder, 8-30 parts of kaolin, 2-8 parts of 500°C eutectic, 4 dioxin vulcanizing agents ‑15 servings. The layers are flame retardant and can absorb most of the heat, and the optical fiber can maintain light transmission for a long time.

Description

technical field [0001] The invention relates to the field of communication cables, in particular to a fire-resistant and flame-retardant rail transit communication cable. Background technique [0002] Rail transit has the characteristics of dense concentration of people, large flow of people, and restrictions on the entrance and exit of passages. Therefore, affected by the particularity of the rail transit environment, the safety requirements for rail transit construction are the highest. Once a fire occurs in rail transit, the power communication system will be interrupted immediately, and all lighting and communication will be interrupted. It is necessary for the communication cable to have good fire-resistant characteristics, effectively improve the overload capacity of the line, especially in the event of a fire, to ensure the integrity of the line within a certain period of time, and to meet the emergency treatment of firefighting. In addition to the high requirements f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08L51/06C08K7/24C08K3/32C08L83/07C08K13/02C08K3/34C08K3/00H01B7/29H01B7/295H01B11/00
CPCH01B7/292H01B7/295H01B11/00C08K3/013C08K3/346C08K13/02C08L23/06C08L2201/22C08L2201/02C08L2203/202C08K2201/014C08L51/06C08K7/24C08K2003/323C08L83/04
Inventor 吴士杰陆春良宋志斌谭言秦冯成梁保富吴涛
Owner JIANGSU HENGTONG WIRE & CABLE TECH
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