Thermoplastic radiation-resistant halogen-free low-smoke flame-retardant sheathing material for nuclear power plant cables

Abstract

The invention relates to a thermoplastic radiation-resistant halogen-free low-smoke flame-retardant sheath material for nuclear power plant cables, belonging to the technical field of novel cable materials. In order to solve the material performance requirements when the existing sheathing materials cannot meet the large size, a thermoplastic radiation-resistant halogen-free low-smoke flame-retardant sheathing material for nuclear power plant cables is provided, which includes the following parts by weight: 100% of the base material, and the base material is at least Contains high temperature resistant polyolefin elastomer; high temperature resistant radiation resistant modified masterbatch: 30~40, at least contains condensed polycyclic polynuclear aromatic hydrocarbon resin and high temperature and radiation resistant resin; flame retardant: 100~200, at least contains aluminum hydroxide ; Antioxidant: 4.0-12, at least containing asymmetric hindered phenolic calixarene as main antioxidant; Anti-radiation agent: 1.0-12. The invention can form a synergistic effect, can meet the requirements of thermal life and radiation resistance performance of 90°C / 60 years, and its sheath has uniformity, which is suitable for cable materials with large diameter and thick sheath layer, and has high flame retardant performance.

Description

technical field [0001] The invention relates to a thermoplastic radiation-resistant halogen-free low-smoke flame-retardant sheath material for nuclear power plant cables, belonging to the technical field of novel cable materials. Background technique [0002] Nuclear power plant cables require that the cable sheathing material must have excellent electrical properties, radiation resistance, halogen-free, low smoke, low toxicity and good flame retardant properties. Make the heat resistance meet the requirements for the use of nuclear power plant cables. However, these products are only suitable for sheath materials of general diameter. For large-diameter thick sheath cables, if the cross-linking method is used, there will be a hidden danger of cracking due to the uneven degree of cross-linking of the cable sheath. As disclosed in the Chinese patent (authorized publication number: CN105694192B) previously applied for by the applicant, a high heat-resistant and radiation-resis...

AI Technical Summary

Problems solved by technology

This method can greatly improve the heat resistance of the material, but for cables with a larger outer diameter or a thicker extruded layer, irradiation may cause uneven crosslinking of the sheath polymer composite material, and under long-term stress conditions It is easy to cause the cable sheath to crack

If electron beam irradiation is used for cross-linking, electron residues may also be generated, which will reduce the insulation performance of the material, so it is not suitable for this type of cable to use radiation cross-linking process

[0004] At present, thermoplastic halogen-free low-smoke flame-retardant polyolefin cable sheathing materials do not need to be cross-linked after extrusion, but their long-term working temperature generally does not exceed 90°C, and the thermal life of 90°C / 60 years is not enough, which is not enough to meet Demand for Large Section Thick Sheathed Cables Used in Nuclear Power Plants

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