Nuclear power 1E-level K3-type thermal shrinkage material and preparation process

Abstract

The invention provides a nuclear power 1E-level K3-type thermal shrinkage material and a preparation process. Prepared polyolefin resin, flame retardant, antioxidizer, thermal stabilizer and modifyingagent are led into and mixed in an internal mixer; after polyolefine is melted, plastic processing aid is added, and masterbatch of the 1 E degree K3 thermal shrinkage material can be obtained afterthe operation of mixing is carried out; and after being pressed into pieces by an oil hydraulic press or being extruded by an extruding machine, the masterbatch is irradiated by an electron accelerator so as to obtain the 1E-level K3-type thermal shrinkage material. The coordination effect of nitrogen-containing flame retardant, halogen-free flame retardant aluminium hydroxide and magnesium hydroxide system is utilized to improve the flame retardant property and the temperature-resistance property; and the selected plastic modifying agent, i.e. ethylene propylene terpolymer rubber, silicon rubber, and thermal stabilizer, i.e. methyl tin mercaptide, are respectively conducive to improving temperature grade of the system, thereby meeting the higher requirement of enabling the service life toreach 40 years at the temperature of 90 DEG C under the circumstance that the system keeps other properties at an excellent state.

Description

technical field

[0001] The invention relates to a nuclear power 1E grade K3 heat-shrinkable material, and also provides a preparation process of the heat-shrinkable material, which belongs to the technical field of cable accessory manufacturing. Background technique

[0002] Nuclear power plant 1E heat-shrinkable cable accessories refer to the safety level of electrical system equipment that completes the emergency shutdown of the reactor; isolation of the containment, emergency cooling of the core, export of residual heat from the reactor, heat export from the containment of the reactor, and prevention of discharge of radioactive substances to the surrounding environment. Products are divided into three categories according to the safety category of electrical system equipment in nuclear power plants: K1, K2, and K3.

[0003] Among them, K3 products are installed outside the containment of nuclear reactors, and can still perform their prescribed functions under normal envir...

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