Low-smoke, halogen-free and flame-retardant double-layer insulated wire

Abstract

The invention discloses a low-smoke, halogen-free and flame-retardant double-layer insulated wire, and relates to the wire flame-retardant technology. The low-smoke, halogen-free and flame-retardant double-layer insulated wire comprises an outer-layer protective sleeve, a plurality of fire extinguishing bags are arranged on the outer surface of the outer-layer protective sleeve at equal intervals, a filling cotton layer is arranged in the outer-layer protective sleeve, a waterproof layer is arranged in the filling cotton layer, a plurality of inner wires are wrapped in the waterproof layer, the adjacent inner wires are attached to each other, polypropylene is filled between the waterproof layer and the inner wires, a first insulating layer is arranged on the outermost layer of the inner wires, a second insulating layer is wrapped in the first insulating layer, and a copper conductor is arranged in the second insulating layer. The first insulating layer and the second insulating layer are sequentially arranged outside the copper conductor, the first insulating layer is made of a high-temperature-resistant, low-smoke and halogen-free insulating material, and the second insulating layer is a crosslinked polyethylene layer, so that the insulating property of the wire is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of electric wire protection and relates to electric wire flame-retardant technology, in particular to a low-smoke, halogen-free, flame-retardant double-layer insulated electric wire. Background technique [0002] The insulating materials used in the existing low-smoke, halogen-free, flame-retardant insulated wires are mainly thermoplastic polyolefin or thermosetting polyolefin materials, and the temperature resistance grade is: thermoplastic low-smoke, halogen-free, flame-retardant polyolefin is 90 ° C; Flame retardant polyolefin is 105 degrees, 125 degrees. The thermoplastic low-smoke halogen-free flame-retardant polyolefin wire is easy to produce and process, and the insulation extrusion is easy to follow-up and does not require reprocessing. However, the insulated wires using this material are used in a humid environment for a long time, and the conductor will release heat when the power is continuously ...

AI Technical Summary

Problems solved by technology

However, the insulated wires using this material are used in a humid environment for a long time, and the conductor will release heat when the power is continuously applied. The additives such as magnesium hydroxide and smoke suppressant in the insulating material are unstable after being heated and will absorb moisture in the air. Causes a rapid drop in insulation resistance, causing power outages and short-circuit accidents

The production and processing of thermosetting low-smoke, halogen-free, flame-retardant polyolefin wires is complicated. After the insulation is extruded, it must be irradiated with an accelerator to complete the cross-linking reaction. The accelerator required is expensive and there are many supporting facilities, so the cost is relatively high.

[0003] At the same time, the low-smoke, halogen-free, flame-retardant polyolefin insulated wire produced by the above two materials has poor moisture-proof and waterproof performance, and the minimum value of insulation resistance at working temperature can only be said to meet the standard requirements.

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