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Gradiently flexible n-gamma mixed field radiation shielding material and preparation method thereof

A radiation shielding and mixed field technology, which is applied in the field of nuclear radiation protection, can solve problems such as easy peeling, low interlayer strength, and low strength of shielding composite materials, and achieve interlayer bonding strength fatigue resistance, high interlayer bonding strength, and shielding high efficiency effect

Active Publication Date: 2018-03-09
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since γ-rays are continuously emitted during the neutron shielding process, for the n-γ radiation mixed field, the distribution of neutron-shielding functional materials shows an increasing trend, and when the γ-shielding functional fillers show a decreasing trend, the shielding efficiency is higher, but Flexible radiative materials with gradient distribution of functional fillers are currently not available
In addition, due to the presence of shielding functional fillers, shielding composites have the disadvantages of low strength, poor flexibility, low interlayer strength, and easy peeling.

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  • Gradiently flexible n-gamma mixed field radiation shielding material and preparation method thereof

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preparation example Construction

[0033] The preparation method of the gradient type flexible n-γ mixed field radiation shielding material of the present invention comprises the following steps:

[0034] (1) Preparation of silica gel-based shielding layer: Mix the masticated high-temperature vulcanized silica gel and vulcanizing agent together with the surface-treated gamma shielding functional components and neutron shielding functional components at 120°C until the fillers are evenly dispersed , and press into a film, wash and dry after cooling, apply a layer of isocyanate and dry;

[0035] (2), the preparation of the second layer of polyurethane coating: the water-based polyurethane emulsion of 50 parts of highly elastic water-based radiation shielding polyurethane coating ingredients, 20-50 parts of γ-shielding functional fillers, and 0-30 parts of neutron-absorbing functional fillers, by weight Add 0.2-0.5 parts of rheological agent and 0.1-0.5 parts by weight of wetting and dispersing agent into the batc...

Embodiment 1

[0043] The thickness ratio of the four-layer structure in the gradient flexible n-γ mixed field radiation shielding material of the present invention is 2:1:1:1.

[0044] (1) Preparation of silica gel-based shielding layer: Mix 100g of high-temperature vulcanized silica gel, vulcanizing agent and 200g of surface-treated W powder at 120°C until the filler is evenly dispersed, and press it into a film with a thickness of 1mm. . After cooling, wash and dry, apply a layer of isocyanate and dry. The particle size of the tungsten powder is 2 μm.

[0045] (2), the preparation of the second layer of polyurethane coating: 50g of highly elastic water-based radiation shielding polyurethane coating base material, 30g of tungsten powder, 30g of boron carbide, 0.5g of rheological agent, and 0.5g of wetting and dispersing agent are added to the batching tank and used at high speed Stir with a mixer for 20 minutes, put it into a ball mill and grind to a fineness below 10 μm.

[0046] (3) A...

Embodiment 2

[0056] The thickness ratio of the four-layer structure in the gradient flexible n-γ mixed field radiation shielding material of the present invention is 1:1:1:1.

[0057] (1) Preparation of silica gel-based shielding layer: Mix 100g of high-temperature vulcanized silica gel and vulcanizing agent and 150g of surface-treated W powder at 120°C until the filler is evenly dispersed, and press it into a film with a thickness of 1mm . After cooling, wash and dry, apply a layer of isocyanate and dry. The particle size of the tungsten powder is 2 μm.

[0058] (2), the preparation of the second layer of polyurethane coating: 50g of highly elastic water-based radiation shielding polyurethane coating base material, 20g of tungsten powder, 30g of boron carbide, 0.5g of rheological agent, and 0.5g of wetting and dispersing agent are added to the batching tank and used at high speed Stir with a mixer for 20 minutes, put it into a ball mill and grind to a fineness below 10 μm.

[0059] (3)...

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Abstract

The invention discloses a gradiently flexible n-gamma mixed field radiation shielding material and a preparation method thereof. The gradiently flexible n-gamma mixed field radiation shielding material is in a four-layer structure including a first layer which is a flexible high-temperature vulcanized silicone layer containing gamma shielding functional filler, and a second layer, a third layer and a fourth layer which are neutron shielding high-elasticity waterborne polyurethane coatings different in components, wherein the neutron shielding high-elasticity waterborne polyurethane coatings are mainly composed of waterborne polyurethane emulsion, gamma shielding functional filler, neutron absorbing functional filler, graphene oxide, additives, isocyanate and glycol ether solvent. The preparation method of the gradiently flexible n-gamma mixed field radiation shielding material mainly comprises preparing the silicone-based shielding layer, mixing, grinding, stirring and filtering raw materials of the high-elasticity waterborne polyurethane coatings different in components, and sequentially and uniformly spraying the high-elasticity waterborne polyurethane coatings onto the surface of the high-temperature vulcanized silicone layer to obtain the gradiently flexible n-gamma mixed field radiation shielding material. The gradiently flexible n-gamma mixed field radiation shielding material has the advantages of being good in flexibility, high in performance of comprehensively shielding neutrons and gamma rays, high in elasticity, interlayer adherence and fatigue resistance and canserve as n-gamma mixed field radiation shielding protective garment materials.

Description

Technical field: [0001] The invention belongs to the field of nuclear radiation protection and the technical field of preparation of nuclear radiation shielding materials, in particular to a gradient type flexible n-γ mixed field radiation shielding material and a preparation method thereof. Background technique: [0002] With the development of nuclear science, nuclear technology is more and more widely used in energy, medical treatment, detection, flaw detection, imaging and other fields. During the manufacture, operation, maintenance and recycling of nuclear facilities, shielding materials are required to provide radiation protection for workers and other instruments and equipment. Among them, high requirements are placed on the flexibility of the shielding material for the staff and complex-shaped equipment. In addition, many radiation fields have more than one kind of radiation, because many neutron sources emit gamma rays at the same time and secondary photons are als...

Claims

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Application Information

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IPC IPC(8): C08J7/04C08J7/06C08J5/18C09D175/14C09D7/61C08L83/04C08K9/00C08K3/08G21F1/10G21F1/02
CPCC08J5/18C08J7/06C08J2383/04C08J2475/14C08K3/08C08K3/38C08K9/00C08K2003/0887C08K2201/003C09D175/14C08J7/0427G21F1/02G21F1/106C08L83/04
Inventor 陈飞达张云陈托汤晓斌
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS