Special high-temperature-resisting and radiation-resisting insulating material for nuclear power station and preparation method of special high-temperature-resisting and radiation-resisting insulating material

Abstract

The invention discloses a special high-temperature-resisting and radiation-resisting insulating material for a nuclear power station and a preparation method of the special high-temperature-resisting and radiation-resisting insulating material. The special high-temperature-resisting and radiation-resisting insulating material is prepared from the following raw materials in parts by weight: 25 to 45 parts of polymethyl vinyl phenylsiloxane, 20 to 35 parts of ethylene-propylene-diene monomer, 15 to 30 parts of polyvinylidene fluoride, 10 to 20 parts of polyethylene-methylacrylate-glycidyl methacrylate, 5 to 15 parts of amino silicon oil, 0.8 to 2 parts of antioxidant, 2.5 to 5.5 parts of crosslinking agent and 0.1 to 2 parts of assistant crosslinker. The preparation method of the insulating material comprises the following steps: firstly, sufficiently banburying rubber and a compatilizer at a certain temperature by adopting an internal mixer; secondly, adding hard plastic and part of powder banburied agglomerated materials into screws by a two-cone forced feeding machine, adjusting the screw compression ratio, extrusion speed and extrusion temperature of the two screws, dynamically vulcanizing the insulating material, and enabling PVDF (Polyvinylidene Fluoride) to be dispersed in a continuous phase of blended rubber to form a sea island structure. The obtained insulating material has the advantages of elasticity of the rubber, certain tensile strength, and excellent high temperature resisting property and irradiation resisting property, and is particularly suitable for cable insulating materials of the nuclear power station.

Description

technical field [0001] The invention relates to a special high-temperature-resistant and radiation-resistant insulating material for nuclear power plants and a preparation method thereof, in particular to a high-temperature-resistant and radiation-resistant insulating material suitable for nuclear power plant cables and a preparation method thereof. Background technique [0002] As a clean energy, nuclear power is one of the main directions of energy development in the future society. According to the 13th Five-Year Plan for Electric Power issued by the National Energy Administration, the general principle is to "accelerate adjustment and optimization, transform and upgrade, and build a clean, low-carbon, safe and efficient modern power industry system." Nuclear power has become a clean, low-carbon energy system. An important part, status is naturally very important. [0003] The third-generation nuclear power puts forward higher life requirements (60 years at 90 degrees) f...

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Problems solved by technology

[0004] At present, polyethylene, cross-linked polyethylene, ethylene-vinyl acetate copolymer, etc. are usually used as extrusion resins for nuclear power plant cable materials. Under the conditions of long-term heat aging and radiation aging, the mechanical and electrical properties of the material deteriorate significantly.

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