Halogen-free low-smoke flame-retardant B1-level control cable and preparation method thereof

Abstract

The invention provides a halogen-free low-smoke flame-retardant B1-level control cable and a preparation method thereof. The halogen-free low-smoke flame-retardant B1-level control cable comprises a cable core, a first glass tape flame-retardant tape wrapping the cable core, a braided composite shielding layer arranged outside the first glass tape flame-retardant tape, a second glass tape flame-retardant tape wrapped outside the composite shielding layer, an oxygen barrier layer extruded outside the second glass tape flame-retardant tape, a third glass tape flame-retardant tape wrapped outsidethe oxygen barrier layer, and a sheath layer arranged outside the third glass tape flame-retardant tape; the number of wrapping layers of the first glass tape flame-retardant tape, the second glass tape flame-retardant tape and the third glass tape flame-retardant tape changes in a stepped mode, the two ends of each wrapping layer are large, the middle of each wrapping layer is small, and the overlapping rate changes in a stepped mode. The control cable can meet the grading test of the combustion performance of B1 (d1, t1, a1) cables and optical cables of GB 31247-2014, the fire-resistant cable can bear the circuit integrity fire-resistant test at the temperature of 950-1000 DEG C for 90 minutes; meanwhile, the control cable has excellent electromagnetic compatibility.

Description

technical field [0001] The invention relates to the technical field of control cables, in particular to an invention-halogen-free, low-smoke, flame-retardant B1-level control cable and a preparation method thereof. Background technique [0002] At present, B1 level power cables are widely used in power supply systems in public engineering occasions (such as subways, hospitals, airports, theaters, large stadiums, shopping malls and other densely populated areas), but the control cables required for the matching control system, its Most of the conventional flame-retardant control cables still used, their flame-retardant safety performance cannot meet the requirements of the fire safety level. Due to the small cross-section of the control cable, the small outer diameter of the cable, and the low content of non-metallic flame-retardant materials in the cable, it is difficult to pass the B1-level flame-retardant test requirements specified in GB31247-2014 according to the traditi...

AI Technical Summary

Problems solved by technology

[0002] At present, B1 level power cables are widely used in power supply systems in public engineering occasions (such as subways, hospitals, airports, theaters, large stadiums and shopping malls, etc.), but the control cables required for the matching control system, its Most of the conventional flame-retardant control cables still used, their flame-retardant safety performance can not meet the requirements of fire safety level

Due to the small section of the control cable, the small outer diameter of the cable, and the low content of non-metallic flame-retardant materials in the cable, it is difficult to pass the B1-level flame-retardant test requirements specified in GB31247-2014 according to the traditional flame-retardant cable structure assembly design.

Images