Flexible tungsten-based composite shielding material and preparation method thereof

A composite shielding, tungsten-based technology, applied in the field of design and preparation of flexible tungsten-based composite shielding materials, can solve the problems of less than ideal X-ray shielding, achieve excellent toughness and structural adaptability, large shielding energy range, good shielding performance effect

Inactive Publication Date: 2021-06-25
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, lead has a "absorption weak zone" for rays with energy between 40keV-80keV, which is not ideal as an X-ray shield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Invent a flexible tungsten-based composite shielding material and a preparation method, comprising the following steps:

[0026] 1) Mix 60 parts of tungsten powder and 2 parts of boron carbide powder;

[0027] 2) Mix 38 parts of methyl silicone rubber, a little additive, tungsten powder, and boron carbide powder with an internal mixer or an open mixer;

[0028] 3) Put the mixed lead-free rubber-based elastic shielding material into the vulcanization equipment, and carry out the vulcanization reaction at a temperature of 160°C for about 12 minutes, and the vulcanized product will become a semi-finished product after cooling;

[0029] 4) The semi-finished product is sent to the secondary vulcanization equipment for baking, and the semi-finished product of the secondary vulcanization is cut off by a trimmer to make its size meet the product requirements.

[0030] After testing, the prepared 5mm thick material has a density of 2.52g / cm 3 , the elongation at break is 330%,...

Embodiment 2

[0032] 1) Mix 80 parts of tungsten powder and 2 parts of boron carbide powder;

[0033] 2) Mix 18 parts of methyl silicone rubber, a little additive, tungsten powder, and boron carbide powder with an internal mixer or an open mixer;

[0034] 3) Put the mixed lead-free rubber-based elastic shielding material into the vulcanization equipment, and carry out the vulcanization reaction at a temperature of 160°C for about 12 minutes, and the vulcanized product will become a semi-finished product after cooling;

[0035] 4) The semi-finished product is sent to the secondary vulcanization equipment for baking, and the secondary vulcanized semi-finished product is cut off by a trimmer to make its size meet the product requirements;

[0036] After testing, the prepared 5mm thick material has a density of 4.64g / cm 3 , the elongation at break is 270%, the Shore hardness is 45HA, 60 The Co radioactive source shielding test shows that the lead equivalent is 2.196mmPb, 137 Cs radioactive s...

Embodiment 3

[0038] 1) Mix 70 parts of tungsten powder and 2 parts of boron carbide powder;

[0039] 2) Mix 28 parts of methyl silicone rubber, a little additive, tungsten powder, and boron carbide powder with an internal mixer or an open mixer;

[0040] 3) Put the mixed lead-free rubber-based elastic shielding material into the vulcanization equipment, and carry out the vulcanization reaction at a temperature of 160°C for about 12 minutes, and the vulcanized product will become a semi-finished product after cooling;

[0041] 4) The semi-finished product is sent to the secondary vulcanization equipment for baking, and the secondary vulcanized semi-finished product is cut off by a trimmer to make its size meet the product requirements;

[0042] After testing, the prepared 5mm thick material has a density of 3.29g / cm 3 , the elongation at break is 320%, the Shore hardness is 36HA, 60 The Co radioactive source shielding test shows that the lead equivalent is 1.744mmPb, 137 Cs radioactive s...

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Abstract

The invention discloses a flexible tungsten-based composite shielding material and a preparation method thereof. The flexible tungsten-based composite shielding material comprises the following components in percentage by mass: 60-90% of tungsten powder, 0%-2% of boron carbide powder and the balance being methyl silicone rubber. Tungsten is adopted as a shielding main body material, so that the environment pollution and the adverse effect on the health of a user caused by the shielding material can be avoided; and through selection of shielding material components, the overall shielding performance can be improved, and the obtained shielding material has good shielding performance and mechanical performance.

Description

technical field [0001] The invention relates to the field of shielding materials, in particular to a design and preparation method of a flexible tungsten-based composite shielding material. Background technique [0002] In order to protect the safety of personnel and the environment, lead is widely used as a radiation shielding material for reactors in my country. The main advantages of lead as a radiation shielding material are: higher density, cheaper price, and easy preparation. Compared with lead, tungsten has a higher density and better shielding performance, and has great advantages as a radiation shielding material. [0003] Lead is a toxic heavy metal, which is extremely harmful to the human body and the environment. The storage, processing, transportation, and use of lead will generate lead dust or lead vapor, thereby polluting the environment. In addition, lead has a "absorption weak zone" for rays with energy between 40keV-80keV, which is not ideal as an X-ray s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08K3/08C08K3/38G21F1/10
CPCC08K3/08C08K3/38C08K2003/0887G21F1/106C08L83/04
Inventor 徐涛忠孙寿华杨斌伍晓勇向玉新刘水清王旭康长虎马立勇陈嘉浪张平
Owner NUCLEAR POWER INSTITUTE OF CHINA
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