High-filling composite shielding material for radiation mixing fields and preparation method of high-filling composite shielding material

Abstract

The invention discloses a preparation method of a high-filling composite shielding material for radiation mixing fields. The preparation method comprises the following steps of: quantitatively weighing and uniformly mixing by taking hydrogen-rich thermoplastic resin as a base material, a boron-containing compound as a neutron absorber and metal lead as a gamma-ray absorber, and supplementing functional auxiliaries in a certain proportion; and performing processes such as sectional mould-pressing and sizing, sectional mould-pressing and molding, and the like under certain pressure and temperature field conditions. The preparation method is simple in preparation process and convenient to operate. The prepared high-filling composite shielding material for radiation mixing fields has a good outline state, no cracks, no shrinkage cavity and seam inside, uniform density, good material mechanical performances, and good shielding performances on neutrons and gamma-rays, is widely applied to neutron and gamma-ray ionization radiation protection and research field of places such as nuclear reactors, nuclear power plants, isotope radiation source devices, petroleum exploration well equipment, accelerators and isotope neutron sources.

Description

Technical field [0001] The invention relates to the technical field of preparation of nuclear radiation shielding materials, in particular to a highly filled composite shielding material for a radiation mixing field and a preparation method thereof. Background technique [0002] With the development of nuclear technology, various radiation sources are widely used in nuclear reactors, nuclear power plants, isotope radiation source devices, oil exploration well equipment, accelerators, isotope neutron sources and other facilities. In the ionizing radiation produced by nuclear facilities such as isotope sources, special attention Radiation shielding against gamma rays and neutrons with high penetrating power. Because the mass of neutrons is very close to that of protons, based on the elastic collision mechanism, materials with high hydrogen content have a significant effect on the moderation of neutrons; while boron, lithium, gadolinium and their compounds are excellent thermal...

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Problems solved by technology

For some special equipment, such as shielding devices for micro-stack collimators, neutron flaw detectors and neutron photography equipment, due to the complex shape and structure, it is impossible to meet the shielding protection requirements through multi-layer stacking, and only the overall The thickness of the shielding material to make the shielding device

At present, domestic research on ultra-thick shielding materials is basically blank, because it puts forward high requirements on the molding process. Large-sized, ultra-thick materials with thermoplastic resin as the base material are prone to internal shrinkage cavities and external surface cracks. , poor density uniformity and other defects, the qualified rate of products is very low

In addition, sometimes in order to make the material have a better shielding effect, it is necessary to add a large amount of neutron absorber and gamma ray absorber, and the addition ratio even exceeds 60%. Excessively high addition determines that the content of resin substrate in the material is greatly reduced , Melt fluidity becomes poor, which will have a serious impact on the mechanical strength and molding process of the material

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