Mineral insulated flexible pre-branching fire resistant cable

By using a chemical bonding method involving the compounding of olefin copolymers with specific parameters and modified polyethylene, the problem of uneven dispersion of inorganic flame retardants in cable materials was solved, thereby improving the flame retardant performance and mechanical strength of the cable and achieving high-efficiency flame retardancy and impact resistance at high temperatures.

CN121378920BActive Publication Date: 2026-07-03GUANGZHOUZHUJIANG CABLE CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
GUANGZHOUZHUJIANG CABLE CO LTD
Filing Date
2025-10-30
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Existing technologies struggle to achieve efficient flame retardancy without compromising mechanical integrity. Furthermore, high levels of inorganic flame retardants can weaken the mechanical properties of the matrix, leading to material embrittlement, decreased tensile strength, and, in particular, poor impact resistance at high temperatures.

Method used

By using olefin copolymers with specific parameters to modify polyethylene, the dispersion uniformity of inorganic flame retardants in the matrix is ​​improved through chemical bonding, forming a robust chemical network and enhancing the cohesiveness of the material.

Benefits of technology

It improves the breaking elongation, tensile strength and thermal shock resistance of cable materials, enhances the flame retardant properties and overall safety of materials, and meets the application requirements of high-end fire-resistant cables.

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Abstract

The application belongs to the technical field of cables and specifically relates to a mineral insulating flexible prefabricated branch fireproof cable. Cable material used by the cable comprises the following components in mass fraction: 45-55 parts of an olefin copolymer, 15-20 parts of modified polyethylene, 40-50 parts of a flame retardant, 0.10-0.15 parts of an antioxidant A, 0.3-0.6 parts of a lubricant, and 0.10-0.15 parts of an initiator. The application adopts a new low-smoke halogen-free flame-retardant cable material, significantly improves the comprehensive performance of the prefabricated branch fireproof cable, and the cable material has excellent flame retardancy, high mechanical strength and good heat shock resistance, effectively overcomes the bottleneck of traditional materials in fire safety and mechanical performance, greatly improves the reliability of the power supply system, is particularly suitable for harsh safety requirement fields such as high-rise buildings and rail transit, and has a wide application prospect.
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Citation Information

Patent Citations

  • A low-smoke, halogen-free flame-retardant polyolefin cable material and its preparation method

    CN103865165B

  • Halogen-free flame-retardant ceramicized polyolefin cable material for fire-resistant cables and its preparation method

    CN105367965B

  • Low-smoke, halogen-free and flame retardant polyolefin cable material and preparation method thereof

    CN103865165A