CN-122025263-A - Long-life low smoke zero halogen flame retardant cable

Abstract

The invention discloses a long-life low-smoke halogen-free flame-retardant cable, which belongs to the technical field of wires and cables and comprises an annealed copper conductor, wherein the outer layer of the annealed copper conductor is coated with an irradiation crosslinking insulating material, and the outer layer of the irradiation crosslinking insulating material is coated with an irradiation crosslinking low-smoke halogen-free insulating material. The invention has the advantages of extremely low resistance, high conductivity, high tensile strength and effective resistance to mechanical fatigue due to the fact that the arranged annealed copper conductor has extremely low resistance and high tensile strength, and the arranged irradiation crosslinking insulating material and the irradiation crosslinking low-smoke halogen-free insulating material have the advantages that the inner layer meets the electrical insulating performance, the outer layer has the flame retardant performance, the inner layer and the outer layer simultaneously meet the requirement of long service life, and the replacement cost of the electric wire is reduced.

Inventors

• WANG BO
• CAO BO
• HAN PENG
• YANG BIN
• SHEN JIANAN
• Zong Xuqiu
• ZHOU YUN
• LI JIONG

Assignees

• 远程电缆股份有限公司

Dates

Publication Date

20260512

Application Date

20260312

Claims (5)

1. 1. The low-smoke halogen-free flame-retardant cable with the long service life is characterized by comprising an annealed copper conductor (1), wherein the outer layer of the annealed copper conductor (1) is coated with an irradiation crosslinking insulating material (2), and the outer layer of the irradiation crosslinking insulating material (2) is coated with an irradiation crosslinking low-smoke halogen-free insulating material (3); The radiation crosslinking insulating material (2) and the radiation crosslinking low-smoke halogen-free insulating material (3) are prepared by double-layer coextrusion insulation and radiation crosslinking technology, and a double-layer composite structure with an inner layer having electrical insulation performance and an outer layer having flame retardant performance is formed.
2. 2. The long-life low-smoke halogen-free flame-retardant cable of claim 1, wherein the annealed copper conductor (1) is made of oxygen-free copper with purity of more than 99.99%.
3. 3. The long-life low-smoke halogen-free flame-retardant cable according to claim 1, wherein the annealed copper conductor (1) adopts a twisted structure of a plurality of fine copper wires, the twisted pitch diameter ratio is 10-16 times, and the elongation of the conductor monofilament after annealing is not less than 25%.
4. 4. The long-life low-smoke halogen-free flame-retardant cable according to claim 1, wherein the irradiation crosslinking insulating material (2) and the irradiation crosslinking low-smoke halogen-free insulating material (3) are made of long-life nuclear power station nuclear-grade cable crosslinking insulating materials.
5. 5. The long-life low-smoke halogen-free flame-retardant cable of claim 1, wherein the metal hydrate flame retardant is added into the irradiation crosslinking low-smoke halogen-free insulating material (3).

Description

Long-life low smoke zero halogen flame retardant cable Technical Field The invention belongs to the technical field of wires and cables, and particularly relates to a long-life low-smoke halogen-free flame-retardant cable. Background With the continuous upgrade of the infrastructure construction of China, especially the improvement of the requirements of high-rise buildings, rail transit, nuclear power stations and the like on the safety and durability of the cable, the service life of the cable becomes one of important indexes for measuring the performance of the cable. In 2014, the living building issues a new rule, the design life of the building cable is required to be not less than 70 years, and the research and development of the cable with long service life in the industry are promoted. However, the conventional cable generally has a design life of 20 to 30 years, and has the following problems: 1. The aging resistance is poor, and in the long-term operation process, the insulating material is easy to age and become brittle, so that the electrical performance is reduced; 2. the flame retardant performance is insufficient, a large amount of toxic halogen acid gas can be released by common PVC and other materials in a fire disaster, so that people are prevented from being evacuated; 3. The maintenance cost is high, the service life of the cable is short, frequent replacement is needed, and the long-term operation cost of engineering is increased. Disclosure of Invention The technical problem to be solved by the invention is to overcome the defects of the prior art and provide the long-life low-smoke halogen-free flame-retardant cable. The technical scheme adopted for solving the technical problems is that the long-life low-smoke halogen-free flame-retardant cable comprises an annealed copper conductor, wherein the outer layer of the annealed copper conductor is coated with an irradiation crosslinking insulating material, and the outer layer of the irradiation crosslinking insulating material is coated with an irradiation crosslinking low-smoke halogen-free insulating material; the radiation crosslinking insulating material and the radiation crosslinking low-smoke halogen-free insulating material are prepared by double-layer co-extrusion insulation and radiation crosslinking technology, and a double-layer composite structure with an inner layer having electrical insulation performance and an outer layer having flame retardant performance is formed. Furthermore, the annealed copper conductor is made of oxygen-free copper with the purity of more than 99.9 percent. Through the technical scheme, the electric resistance is extremely low, the electric conductivity is high, the loss (energy conservation) of electric power in the transmission process can be effectively reduced, heating caused by overlarge resistance is prevented, the tensile strength is high, and the mechanical fatigue is effectively resisted. Furthermore, the annealed copper conductor adopts a stranding structure of a plurality of fine copper wires, the stranding pitch diameter ratio is 10-16 times, and the elongation of the conductor monofilament after annealing treatment is not less than 25%. Through the technical scheme, the plurality of thin copper wires are stranded, so that the structural compactness of the conductor is guaranteed, excellent bending performance is given to the cable, the conductor is not easy to damage or crack an insulating layer due to repeated bending when the cable is installed and laid, the elongation of the conductor monofilament is not less than 25% after annealing treatment, the conductor material is completely softened, the internal processing stress is thoroughly eliminated, the cable is subjected to cold and heat circulation in long-term operation, the conductor cannot puncture inner insulation due to residual stress rebound, and the service life of the cable is prolonged. Furthermore, the irradiation crosslinking insulating material and the irradiation crosslinking low-smoke halogen-free insulating material are prepared from long-life nuclear power station nuclear-grade cable crosslinking insulating materials. Through the technical scheme, the nuclear-grade cable crosslinking insulating material of the long-life nuclear power station is adopted, the mechanical and physical properties and the electrical properties of the electric wire are enhanced, the inner layer meets the electrical insulating properties, the outer layer has the flame retardant property, and the inner layer and the outer layer meet the long-life requirement simultaneously. Furthermore, a metal hydrate flame retardant is added in the irradiation crosslinking low-smoke halogen-free insulating material. Through the technical scheme, the metal hydrate added in the outer layer is subjected to endothermic decomposition at high temperature to release crystal water, heat is absorbed, oxygen is diluted in the process to form a compact carbonization l