Nuclear class cable sheath material

Abstract

A nuclear class cable sheath material comprises the following components by weight: 30-50 parts of ethylene-vinyl acetate copolymer; 50-70 parts of ethylene propylene rubber; 5-10 parts of silicone rubber; 70-90 parts of magnesium hydroxide; 5-10 parts of boron nitride and 4-12 parts of an antioxidant. After the nuclear class cable sheath material is used for 60 years at 90 DEG C, and a radiation dose of 2400KGy is applied, a sheath layer may not peel, and the nuclear class cable sheath material is high in flame retardant efficiency, low in adding amount and uniform in dispersion, may not agglomerate, and meets material mechanical properties, meanwhile can get through a single vertical combustion (B-type bundling) test.

Description

technical field [0001] The invention relates to a cable sheathing material for nuclear power plants. Background technique [0002] On October 24, 2012, Premier Wen Jiabao of the State Council presided over an executive meeting of the State Council, where the "Nuclear Power Safety Plan (2011-2020)" and the "Nuclear Power Mid- and Long-Term Development Plan (2011-2020)" were discussed and approved again. The executive meeting of the State Council stated that the pace of construction should be "reasonably grasped", "steady progress", and "normal construction should be resumed steadily". In terms of access thresholds, "new nuclear power units must meet the third-generation safety standards", "according to the world's highest Safety requires new nuclear power projects.” [0003] Magnesium hydroxide has the characteristics of flame retardancy, drip resistance, smoke elimination, and efficient promotion of charring of substrates. It is a commonly used flame retardant. However, th...

AI Technical Summary

Problems solved by technology

However, the surface polarity of magnesium hydroxide powder is large. Due to the interaction of the electrostatic force, the primary particles are connected by solid phase bridges and tend to aggregate into agglomerates to form larger secondary agglomerated particles, which are difficult to disperse uniformly. Molecular base material compatibility is also poor

In addition, the thermal decomposition heat absorption of magnesium hydroxide is less than the combustion heat of the polymer base material, resulting in a large filling amount and a decrease in the mechanical properties of the composite material.

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