Thermoplastic, radiation-resistant, halogen-free, low-smoke and flame-retardant sheath material for nuclear power station cables

Abstract

The invention relates to a thermoplastic, radiation-resistant, halogen-free, low-smoke and flame-retardant sheath material for nuclear power station cables, and belongs to the technical field of novelcable materials. In order to solve the problem that an existing sheath material cannot meet the material performance requirement when the size is large enough, the thermoplastic, radiation-resistant,halogen-free, low-smoke and flame-retardant sheath material for nuclear power station cables comprises, by weight, 100 parts of a base material least containing a high-temperature-resistant polyolefin elastomer, 30-40 parts of a high-temperature-resistant and radiation-resistant modified master batch least containing a condensed polycyclic polynuclear aromatic hydrocarbon resin and a high-temperature-resistant and radiation-resistant resin, 100-200 parts of a flame retardant least containing aluminum hydroxide, 4.0-12 parts of an antioxidant least containing asymmetric hindered phenol calixarene as a main antioxidant and 1.0-12 parts of an anti-radiation agent. The sheath material of the invention can form synergistic effects, can reach the 90 DEG C / 60 years thermal life and radiation resistance requirements, makes a sheath layer uniform, is suitable for cables with large-caliber thick sheath layers, and has high flame retardant property.

Description

technical field [0001] The invention relates to a thermoplastic radiation-resistant, halogen-free, low-smoke flame-retardant sheathing material for nuclear power plant cables, and belongs 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 radiatio...

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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