A kind of radiation cross-linked fire-resistant long-life cable and its preparation method

Abstract

The invention discloses a radiation cross-linked fire-resistant long-life cable and a preparation method thereof, which sequentially include a cable core, a filling layer, a fire-resistant layer and a protective layer from the inside to the outside, and the cable core is formed by twisting several insulating core wires , the insulated core wire includes a conductor layer and an insulating layer from the inside to the outside, the conductor layer is formed by twisting a plurality of copper single wires, and the copper single wire is a special-shaped copper single wire; the insulating layer is sequentially from the inside to the outside It includes an insulating inner layer and an insulating outer layer; the refractory layer is wrapped by a flame-retardant tape or made of a vitrified refractory material. The preparation of the conductor layer in the present invention enhances the flexibility of the cable, improves the fire resistance coefficient, and prolongs the service life of the cable; meets the requirements of the civil nuclear facility project on the cable insulation flame retardant performance, electrical performance, mechanical performance, and radiation resistance performance. After the life evaluation test, it is deduced that the service life of the conductor is not less than 70 years at the operating temperature of 70°C.

Description

technical field [0001] The invention relates to a cable and a preparation method thereof, in particular to a radiation cross-linked fire-resistant long-life cable and a preparation method thereof. Background technique [0002] With the rapid development of social economy, ordinary cables can no longer meet the requirements of urban and rural buildings, large public facilities and important places, etc. Fires caused by electrical short circuits caused by cable aging have become more and more common, and the resulting safety accidents have also followed Increase. Although ordinary polyvinyl chloride and polyethylene insulated wires and cables have excellent mechanical, electrical and processing properties, the biggest shortcoming is flammability, high calorific value, fast flame propagation speed, and a large amount of toxic and harmful corrosive substances will be released when burning. Gas and smoke, causing "secondary disasters." These gases and thick smoke not only endan...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a radiation cross-linked fire-resistant long-life cable and its preparation method, so as to solve the problems of short service life and non-environmental protection of existing insulating fire-proof cables

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