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CN-121983379-A - Low-smoke halogen-free flame-retardant cable and preparation method thereof

CN121983379ACN 121983379 ACN121983379 ACN 121983379ACN-121983379-A

Abstract

The invention relates to the technical field of cables and provides a low-smoke halogen-free flame-retardant cable and a preparation method thereof, wherein the low-smoke halogen-free flame-retardant cable comprises a cable core, an insulating layer, a shielding layer, a wrapping layer, an armor layer and a low-smoke halogen-free sheath layer from inside to outside, wherein inorganic flame-retardant materials are filled between the wrapping layer and the shielding layer, the cable core comprises a plurality of wire cores, the inorganic flame-retardant materials are glass fiber yarns, and the low-smoke halogen-free sheath layer comprises the following raw materials in parts by weight of 100 parts of polyethylene resin, 25-30 parts of ethylene-vinyl acetate copolymer and 20-25 parts of inorganic flame retardant. Through the technical scheme, the problems that the flame retardance and the mechanical property of the cable in the related technology cannot be well combined and the smoke density is not well controlled are solved.

Inventors

  • Wu Gexi
  • FANG WEIWEI
  • WU JINRAN

Assignees

  • 河北海川线缆有限公司

Dates

Publication Date
20260505
Application Date
20260212

Claims (10)

  1. 1. The low-smoke halogen-free flame-retardant cable is characterized by comprising a cable core, an insulating layer, a shielding layer, a wrapping layer, an armor layer and a low-smoke halogen-free sheath layer from inside to outside, wherein inorganic flame-retardant materials are filled between the wrapping layer and the shielding layer, the cable core comprises a plurality of wire cores, the inorganic flame-retardant materials are glass fiber filaments, and the raw materials of the low-smoke halogen-free sheath layer comprise, by weight, 100 parts of polyethylene resin, 25-30 parts of ethylene-vinyl acetate copolymer and 20-25 parts of inorganic flame retardant.
  2. 2. A low smoke zero halogen flame retardant cable according to claim 1 wherein said core comprises copper conductors twisted from copper wires and cross-linked polyethylene material coated over the copper conductors.
  3. 3. The low smoke zero halogen flame retardant cable of claim 1 wherein the tape layer is a mica tape.
  4. 4. The low smoke zero halogen flame retardant cable of claim 1 wherein the shielding layer is a wire braid.
  5. 5. The low smoke zero halogen flame retardant cable of claim 1 wherein the armor is an aluminum wire armor or a steel wire armor.
  6. 6. The low smoke zero halogen flame retardant cable of claim 1 wherein the insulating layer is a crosslinked polyethylene insulating layer.
  7. 7. The low-smoke halogen-free flame-retardant cable according to claim 1, wherein the low-smoke halogen-free sheath layer comprises, by weight, 1-1.5 parts of an antioxidant and 0.5-0.8 parts of a light stabilizer.
  8. 8. The low-smoke halogen-free flame-retardant cable according to claim 1 is characterized in that the inorganic flame retardant comprises, by weight, 100 parts of silane modified magnesium hydroxide and 30-50 parts of anhydride-containing compound modified magnesium hydroxide, and the silane modified magnesium hydroxide comprises an amino-containing silane coupling agent and magnesium hydroxide.
  9. 9. The low smoke zero halogen flame retardant cable of claim 8 wherein the anhydride compound modified magnesium hydroxide material comprises an anhydride compound comprising one or both of trimellitic anhydride and phenylmaleic anhydride.
  10. 10. A method for preparing the low-smoke halogen-free flame-retardant cable, which is used for preparing the low-smoke halogen-free flame-retardant cable as claimed in any one of claims 1 to 9, and is characterized by comprising the following steps: s1, extruding and wrapping a material of an insulating layer on the outer side of a cable core to form the insulating layer, arranging a shielding layer on the outer side of the insulating layer, and wrapping an inorganic flame-retardant material by adopting a wrapping belt material to form a wrapping belt; S2, arranging an armor layer outside the wrapping band layer to obtain a semi-finished product of the cable; s3, uniformly mixing the raw materials of the low-smoke halogen-free sheath layer, and extruding and coating the raw materials on the outer side of the semi-finished cable to obtain the low-smoke halogen-free flame-retardant cable; in step S1, the cable core is formed by twisting a plurality of wire cores.

Description

Low-smoke halogen-free flame-retardant cable and preparation method thereof Technical Field The invention relates to the technical field of cables, in particular to a low-smoke halogen-free flame-retardant cable and a preparation method thereof. Background With the rapid development of the power industry, the construction engineering, the rail transit and the new energy industry, the cable is used as a core carrier for energy transmission and signal transmission, the application scene is increasingly complex, and the requirement on the safety performance is continuously improved. The traditional polyvinyl chloride cable can release a large amount of toxic and harmful gases (such as hydrogen chloride) and dense smoke when burning, so that personnel poisoning and choking can be caused, rescue work can be hindered, and serious threat is brought to life and property safety. Therefore, the low-smoke halogen-free flame-retardant cable gradually replaces the traditional PVC cable by virtue of the core advantages of low smoke, no halogen, low toxicity and flame retardance during combustion, and is widely applied to places with severe requirements on safety performance such as high-rise buildings, hospitals, subways and nuclear power stations. At present, the existing low-smoke halogen-free flame-retardant cable mainly has the advantages that an inorganic flame retardant (such as magnesium hydroxide and aluminum hydroxide) is added in a sheath layer to achieve a flame-retardant effect, and part of the product is additionally provided with a flame-retardant wrapping layer between an insulating layer and an armor layer to enhance flame retardant performance. However, the prior art still has the problem of insufficient flame retardance and mechanical strength of the cable. Therefore, research and development of a low-smoke halogen-free flame-retardant cable with reasonable structural design, high flame retardance, excellent mechanical property and low smoke density becomes a technical problem to be solved urgently in the current industry. Disclosure of Invention The invention provides a low-smoke halogen-free flame-retardant cable and a preparation method thereof, which solve the problems that the flame retardance and mechanical properties of the cable in the related art cannot be well combined, and the smoke density is not well controlled. The technical scheme of the invention is as follows: The invention provides a low-smoke halogen-free flame-retardant cable which comprises a cable core, an insulating layer, a shielding layer, a wrapping layer, an armor layer and a low-smoke halogen-free sheath layer from inside to outside, wherein inorganic flame-retardant materials are filled between the wrapping layer and the shielding layer, the cable core comprises a plurality of wire cores, the inorganic flame-retardant materials are glass fiber filaments, and the raw materials of the low-smoke halogen-free sheath layer comprise, by weight, 100 parts of polyethylene resin, 25-30 parts of ethylene-vinyl acetate copolymer and 20-25 parts of inorganic flame retardant. As a further technical scheme, the wire core comprises a copper conductor formed by twisting copper wires and a crosslinked polyethylene material coated outside the copper conductor. As a further technical scheme, the wrapping band layer is made of mica tapes. As a further technical scheme, the shielding layer is a metal wire braiding layer. As a further technical scheme, the armor layer is an aluminum wire armor layer or a steel wire armor layer. As a further technical scheme, the insulating layer is a crosslinked polyethylene insulating layer. As a further technical scheme, the raw materials of the low-smoke halogen-free sheath layer further comprise 1-1.5 parts by weight of an antioxidant and 0.5-0.8 part by weight of a light stabilizer. As a further technical scheme, the antioxidant comprises one or more of antioxidant 1010, antioxidant 168 and antioxidant 1076. As a further technical scheme, the light stabilizer comprises one or two of light stabilizer UV-770 and light stabilizer UV-865. The inorganic flame retardant comprises, by weight, 100 parts of silane modified magnesium hydroxide and 30-50 parts of anhydride-containing compound modified magnesium hydroxide, wherein the silane modified magnesium hydroxide comprises an amino-containing silane coupling agent and magnesium hydroxide, and the anhydride-containing compound modified magnesium hydroxide can be 30 parts, 35 parts, 40 parts, 45 parts and 50 parts, preferably 40 parts. The inorganic flame retardant is added into the cable, so that the flame retardant performance and the mechanical performance are difficult to be compatible, and in order to achieve an ideal flame retardant grade, the existing cable often needs to be added with the inorganic flame retardant in a sheath layer, so that the flexibility of the sheath layer is reduced, the processing difficulty is increased, the mechanical performance of