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 fireproof flame-retardant rail transit communication cable. The fireproof flame-retardant rail transit communication cable comprises a low-smoke zero-halogen outer sheath, a first fireproof layer, a high-magnetic-conductive steel tape armoring layer, a low-smoke zero-halogen inner sheath, a second fireproof layer, an aluminum sheath, a PE heat insulating layer, a waterproof layer and multiple strands of stranded insulating core wires. A low-smoke zero-halogen polyethylene material is prepared from 80-90 parts of polyethylene, 5-10 parts of phosphorus flame-retardant plasticizer BDP, 15-25 parts of PE-g-MAH, 10-30 parts of ammonium polyphosphate and 30-60 parts of expansible graphite. The second fireproof layer is made of a fireproof silicone rubber material. The fireproof silicone rubber material is prepared from 30-100 parts of methyl vinyl silicone rubber, 4-15 parts of vitrified powder, 1-4 parts of rigid mineral powder, 8-30 parts of kaolin, 2-8 parts of 500DEG C eutectic and 4-15 parts of DCBP. All the layers are retardant to flames, most of heat can be absorbed, and optical fibers can keep optical connectivity 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
CPCC08K3/013C08K3/346C08K13/02C08K2201/014C08L23/06C08L2201/02C08L2201/22C08L2203/202H01B7/292H01B7/295H01B11/00C08L51/06C08K7/24C08K2003/323C08L83/04
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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