Neutron shielding material and preparation method thereof

Abstract

The invention discloses a neutron shielding material and a preparation method thereof. The neutron shielding material is prepared from, by weight, 20-40% of a matrix, 20-40% of a curing agent, 10-40%of a neutron absorbing agent, 1-5% of a flame retardant and 1-5% of a density increasing agent. By adoption of a 3-aminopropyl triethoxy silane coupling agent for surface modification of the neutron absorbing agent, the problem of interface compatibility of the neutron absorbing agent and the matrix is solved; under synergistic effects of a platinum catalyst serving as the curing agent and the matrix composed of high-hydrogen-content phenyl vinyl silicon resin and phenyl hydrogen-containing silicon oil, a novel boron-based organic neutron shielding composite material is obtained and has appropriate viscosity and great formability, and the novel boron-based organic neutron shielding composite material further has strong shielding protective effects on nuclear neutrons and gamma rays and isalso excellent in heat resistance, mechanical property and fast neutron decelerating performance.

Description

technical field [0001] The invention relates to materials for shielding spent fuel produced by nuclear power plants, in particular to a neutron shielding material and a preparation method thereof. Background technique [0002] Neutrons are one of the basic particles that make up the atomic nucleus. They are not charged, but because of their high speed, they can ionize substances and produce radioactive radiation. They are widely used in national defense, scientific research, radiation therapy and detection. It is indispensable in the use of nuclear fission to develop nuclear power, and provides a large amount of clean energy for human beings. However, a large number of secondary particles produced by neutron ionization will interact with tissue cells, causing great harm to human health; at the same time, neutron radiation Irradiation can cause point defects and dislocations inside the material and degrade the properties of the material. Therefore, the shielding and protectio...

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Problems solved by technology

[0002] Neutrons are one of the basic particles that make up the atomic nucleus. They are not charged, but because of their high speed, they can ionize substances and produce radioactive radiation. They are widely used in national defense, scientific research, radiation therapy and detection. It is indispensable in the use of nuclear fission to develop nuclear power, and provides a large amount of clean energy for human beings. However, a large number of secondary particles produced by neutron ionization will interact with tissue cells, causing great harm to human health; at the same time, neutron radiation Irradiation can cause point defects and dislocations inside the material, degrading the properties of the material, so the shielding and protection of nuclear neutrons and gamma rays has become one of the key factors in the development of new generation nuclear energy

[0003] 10 The absorption cross section of B for thermal neutrons is 3837 targets, which is more than 50 times that of the neutron protection material concrete. Boron steel, lead plate and large concrete with boron as the main absorption body are used as the main material of nuclear protection. Currently, the market contains hydrogen. Paraffin wax, polyethylene, etc. with a relatively high amount have become the first choice for nuclear protection polymer materials, but these traditional, single radiation shielding materials have been difficult to meet the application requirements, such as lead density and toxicity, which are mainly used to protect gamma rays , but the neutron shielding effect is poor; concrete is bulky and difficult to move; boron / aluminum alloy, boron steel, the increase in boron content leads to a decrease in the structural strength of the material, and the decrease in boron content cannot meet the performance requirements, enriched boron-10 The cost is high; cadmium rods have good absorption effect and mechanical properties, but they are expensive and will cause secondary radiation pollution; boron-containing epoxy-based shielding materials have good heat resistance, but are not flexible enough to meet special structural protection Requirements: Polyethylene flexible shielding material greatly reduces the ability to absorb thermal neutrons due to the capture of thermal neutrons and releases secondary γ-rays. At the same time, it must first be pressed into a certain volume of plates, which cannot meet the requirements of on-site potting protection technology; therefore, it is urgent to develop A neutron shielding material that not only has excellent nuclear protection performance, but also meets the requirements of new construction techniques, is the basis for the development and application of new nuclear energy

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