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A kind of low-density neutron shielding material and preparation method thereof

A shielding material and low-density technology, applied in the field of low-density neutron shielding materials and its preparation, can solve the problems of difficulty in further increasing boron content and difficulty in material processing, achieve good neutron shielding efficiency, easy promotion, and simple process operation Effect

Active Publication Date: 2020-11-24
INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN201410340565.4 discloses a neutron shielding material based on PVC and boron carbide, product impact strength 5-10MPa, oxygen index 35%; bending strength 15-25MPa, tensile strength 15-35MPa; Vicat heat resistance temperature 60- 70°C, the boron-containing polymer compound described in this document has the advantage of good flexibility, and is widely used for neutron shielding of special-shaped parts, such as low-energy neutron shielding such as neutron instruments, but the boron content in the polymer It is difficult to further improve, which will lead to difficulties in material processing, and at the same time, it is necessary to add thermal insulation layer in some occasions

Method used

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  • A kind of low-density neutron shielding material and preparation method thereof

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Effect test

Embodiment 1

[0038]First, 15g of zinc borate and 5g of montmorillonite were added to 100mL of polyethylene emulsion (30wt%), stirred at high speed until a uniform colloid was obtained, and the obtained colloid was quickly frozen at -196°C until the ice crystals grew completely, and then vacuum-dried at room temperature until completely frozen. Dry.

Embodiment 2

[0040] First add 18g of boric acid, 9g of boron carbide and 4g of hydroxyapatite into 100mL of polyimide precursor emulsion (9wt%), stir at high speed to a uniform colloid, and quickly freeze the obtained colloid at -196°C until the ice crystals grow completely. Dry in vacuo at room temperature until completely lyophilized.

Embodiment 3

[0042] First add 10g of boron nitride, 20g of rentalite and 15g of kaolin into 100mL of polypropylene (10wt%) and epoxy resin precursor emulsion (25wt%), stir at high speed until a uniform colloid is obtained, and quickly freeze the obtained colloid at -196°C Until the ice crystals grow completely, vacuum-dry at room temperature until completely freeze-dried.

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Abstract

The invention relates to the technical field of neutron shielding materials, and particularly relates to a low-density neutron shielding material and a preparation method of the low-density neutron shielding material. The material is prepared by blending and freeze-drying a polymer solution or emulsion, a boron-containing compound and clay, and the density of the prepared material is 0.05-0.5 g / cm<3>. The problem of material compatibility is solved, and the boron content of the obtained material is higher, therefore, the neutron shielding efficiency of the material is higher, moreover, the material achieves the flame retardant property, low density and thermal insulation property, the chemical stability is excellent, in addition, the process operation is simple, the cost is low, and the material is easy to process and popularize.

Description

technical field [0001] The invention relates to the technical field of neutron shielding materials, in particular to a low-density neutron shielding material and a preparation method thereof. Background technique [0002] Radiation shielding must face various rays such as neutrons of different energies, gamma rays, secondary gamma rays and other charged particles. Among them, neutron is a kind of uncharged particle. When neutron passes through the material, it will mainly interact with the nucleus of the target material. It has stronger penetrating power than electrons and gamma rays, and the damage to the human body is higher than that of the same Electrons, gamma, and X-rays under the absorbed dose are larger. [0003] In recent years, the application of nuclear energy and nuclear technology has achieved rapid development. Traditional neutron shielding materials cannot fully meet the protection requirements of nuclear-powered ships or movable radioactive sources, such as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08L79/08C08L23/12C08L63/00C08L29/04C08L71/02C08L7/00C08L33/04C08L5/02C08L5/06C08K3/38C08K3/34C08K3/32G21F1/10C08J9/28
CPCC08J9/286C08J2201/0484C08J2323/06C08J2323/12C08J2363/00C08J2379/08C08J2423/12C08J2463/00C08K3/32C08K3/346C08K3/38C08K2003/325C08K2003/387C08K2201/014C08L5/02C08L5/06C08L7/00C08L23/06C08L23/12C08L29/04C08L33/04C08L63/00C08L71/02G21F1/10C08L79/08C08K2003/385C08K3/00C08K3/26C08K3/34
Inventor 陈洪兵刘波王浦澄石建敏敖银勇
Owner INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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