Environment-friendly waterproof cable for high-speed rail transit and preparation method

Abstract

The invention discloses an environment-friendly waterproof cable for high-speed rail transit and a preparation method. The cable comprises a conductor, a wrapping tape, an insulating layer, an inner protective layer, a flame-retardant wrapping layer, a waterproof layer and an outer protective layer which are sequentially arranged from inside to outside. The waterproof layer adopts a hydrophobic UV-thermocuring modified polyurethane adhesive and adopts residual heat after extrusion of the outer protective layer to complete adhesive curing, the halogen-free low-smoke flame-retardant belt and the outer protective layer are effectively bonded to be formed through curing, combination is tighter, the waterproof effect is improved, the waterproof layer and the outer protective layer are produced in the same working procedure, the production working procedures are effectively reduced, the production rate is increased, and the product cost is reduced; the waterproof layer is arranged outside the halogen-free low-smoke flame-retardant belt, so that external moisture is effectively prevented from entering the inner layer of the cable, moisture is prevented from permeating into the insulating layer, the stability of the insulating electrical performance of the cable is improved, the probability that the conductor is oxidized due to water entering the cable is reduced, and the service life of the cable is prolonged; and the cable is simple in structure, diversified in function, small in environmental pollution, simple and rapid in preparation method and high in practicability.

Description

technical field [0001] The invention belongs to the technical field of cables, and in particular relates to an environment-friendly waterproof cable for high-speed rail transit and a preparation method thereof. Background technique [0002] Due to the large population flow, the safety of rail transit is of paramount importance. In the design of rail transit, especially subways, considering the penetration of underground water vapor or water accumulation, cables are generally required to have waterproof performance. Ordinary cables have a certain degree of water permeability. If the cable runs for a long time in a humid environment, the external moisture will slowly The ground penetrates into the insulation to form a water tree, which eventually leads to breakdown of the cable insulation and affects the service life of the cable. Generally, the waterproof layer set in the cable is to wrap the aluminum-plastic integrated waterproof layer longitudinally after the insulation is...

AI Technical Summary

Problems solved by technology

In the design of rail transit, especially subways, considering the penetration of underground water vapor or water accumulation, cables are generally required to have waterproof performance. Ordinary cables have a certain degree of water permeability. If the cable runs for a long time in a humid environment, the external moisture will slowly The ground penetrates into the insulation to form a water tree, which eventually leads to breakdown of the cable insulation and affects the service life of the cable

Generally, the waterproof layer set in the cable is to wrap the aluminum-plastic comprehensive waterproof layer longitudinally after the insulation is wrapped with a water-blocking tape for waterproof and water-blocking. This method has many production processes and the water-blocking effect is limited.

Images