Halogen-free flame-retardant sheath material for class-1E K3 cable used for nuclear power station

Abstract

The invention provides a halogen-free flame-retardant sheath material for a class-1E K3 cable used for a nuclear power station. The halogen-free flame-retardant sheath material mainly comprises the following components: ethylene-vinyl acetate copolymer, maleic anhydride-grafted polyolefin, inorganic fire retardant, a synergistic fire retardant, melamine urate, micro-capsulated red phosphorus, an anti-oxidant, an ultraviolet ray absorber, an aqueous graphene solution, a crosslinking sensitizer and a lubricant, wherein the mass percentage of vinyl acetate in the ethylene-vinyl acetate copolymer is about 20 to 40%, a compatilizer is at least one selected from the group consisting of maleic anhydride-grafted ethylene-vinyl acetate copolymer, maleic anhydride-grafted ethylene-octylene copolymer and maleic anhydride-grafted polyethylene, and the ultraviolet ray absorber is at least one selected from the group consisting of 2-(2'-hydroxy-3',5'-di-tert-pentyl-phenyl)benzotriazole and 2-(2'-hydroxy-3',5'-tert-octyl-phenyl)benzotriazole. The halogen-free flame-retardant sheath material has good flame retardation performance, oil resistance, electrical performance and mechanical performance and can meet the requirement on a generation-III nuclear power station for service life of 60 years.

Description

technical field [0001] The invention relates to the field of flame-retardant sheathing materials for nuclear power cables, in particular to a halogen-free flame-retardant sheathing material for nuclear power 1E-class K3 cables. Background technique [0002] Nuclear power is a safe, clean and reliable energy source, and vigorously developing nuclear power is of great significance to solving the energy crisis and protecting the environment. According to my country's latest energy planning, nuclear power plants will become one of the important pillars of the power structure. It is estimated that by 2020, the proportion of nuclear power in my country's total power generation capacity will rise from the current 1.8% to 4%. Premier Li Keqiang of the State Council chaired an executive meeting of the State Council on August 27, 2014, pointing out that clean energy should be vigorously developed, and a number of new coastal nuclear power projects should be started this year and next...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a halogen-free flame-retardant sheath material for nuclear power 1E class K3 cables, which solves the long-term thermal aging of existing nuclear power plant cable sheath materials , Halogen-free flame retardant performance is not ideal, technical problems of poor mechanical properties, provide superior performance, good flame retardant performance, oil resistance, electrical properties and mechanical properties to meet the third-generation nuclear power 60-year service life of nuclear power 1E class K3 cables Halogen-free flame retardant sheathing material

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