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Bendable and foldable organic silicon rubber with high neutron shielding effectiveness and preparation method thereof

A technology of silicone rubber and shielding efficiency, which is applied in the field of silicone rubber and its preparation, can solve the problems of increasing the construction period of the spectrometer and limiting the performance improvement of the neutron spectrometer, and achieves excellent neutron shielding rate and high tensile strength , the effect of good flexibility

Active Publication Date: 2021-10-01
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The neutron shielding materials used in the early construction are completely dependent on imports, which not only greatly increases the construction period of the spectrometer, but also limits the performance improvement of the neutron spectrometer to a certain extent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A: Mixed rubber preparation: add 100 parts of 110 silica raw rubber, 20 parts of fumed silica, and 5 parts of B to the kneader 4 For C powder, close the upper cover, open and knead for about 60 minutes, when the inorganic powder is completely compatible with 110 raw silica gel, open the kneader to heat up the temperature of the material. When the temperature of the material reaches (120±10)°C, turn on the vacuum of the kneader to above 0.75MPa s, after extracting for (60±30) minutes, stop the vacuum and heating, open the upper cover of the kneader, cool naturally to room temperature, take out and knead good compound;

[0027] B: Rubber compounding: Put the kneaded mixed rubber on the roller of the two-roller rubber mixer, and roll repeatedly to remove the air bubbles in the rubber. After repeated mixing for 10 times, add 1.5 parts of BPO, 2 parts of DCP, mixed again 6 to 8 times. High-speed roller distance, make the film thickness reach about 3.5mm. Remove the film c...

Embodiment 2

[0031] A: Mixed rubber preparation: add 100 parts of 110 silica raw rubber, 30 parts of fumed silica, and 30 parts of B to the kneader 4 For C powder, close the upper cover, and start kneading for about 60 minutes. When the inorganic powder is completely compatible with 110 raw silica gel, start the kneader to heat up the material temperature; when the material temperature reaches (120±10)°C, start kneading Machine vacuum to 0.75MPa·s or more, after extraction for (60±30) minutes, stop vacuum and heating, open the upper cover of the kneader, cool to room temperature naturally, take out the kneaded mixed rubber;

[0032] B: Rubber compounding: Put the kneaded mixed rubber on the roller of the two-roller rubber mixer, and roll repeatedly to remove the air bubbles in the rubber. After repeated mixing for 10 times, add 3 parts of foam Agent H, 1 part of BPO, 0.5 part of DCP, knead again for 6 to 8 times; high-speed roller distance, make the thickness of the film reach about 3.5mm,...

Embodiment 3

[0036]A: Mixed rubber preparation: Add 100 parts of 110 silica raw rubber, 40 parts of fumed silica, and 80 parts of B to the kneader 4 For C powder, close the upper cover, and start kneading for about 60 minutes. When the inorganic powder is completely compatible with 110 raw silica gel, start the kneader to heat up the material temperature; when the material temperature reaches (120±10)°C, start kneading Machine vacuum to 0.75MPa·s or more, after extraction for (60±30) minutes, stop vacuum and heating, open the upper cover of the kneader, cool to room temperature naturally, take out the kneaded mixed rubber;

[0037] B: Rubber compounding: Put the kneaded mixed rubber on the roller of the two-roller rubber mixer, and roll repeatedly to remove the air bubbles in the rubber. After repeated mixing for 10 times, add 3 parts of BPO, 1 part of bis-2-pentasulfurizing agent, knead again for 6-8 times; high-speed roller distance, make the thickness of the film reach about 3.5mm; remo...

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Abstract

The invention discloses bendable and foldable organic silicon rubber with high neutron shielding effectiveness and a preparation method thereof. According to the method, 110 silicone rubber is used as base rubber, fumed silica, nuclear power grade B4C powder or a foaming agent is added, and hot-pressing vulcanization molding is performed under the action of a vulcanizing agent. According to different components of the material, the neutron shielding rate of the boron silicon rubber can reach 99.9% or above for fast neutrons, medium energy neutrons or slow neutrons. The organic silicon rubber can be widely applied to spallation neutron source, nuclear facility pipeline neutron protection and neutron radiation field personnel protection; meanwhile, the material is simple in preparation process and can be subjected to continuous extrusion molding.

Description

technical field [0001] The invention relates to the technical field of special rubber materials, in particular to a bendable and foldable silicone rubber with high neutron shielding performance and a preparation method thereof. Background technique [0002] The China Spallation Neutron Source (CSNS) plans to build two target stations, each containing about 20 spectrometers, and only 15% of them have been built so far. In the next 10 years, 17 neutron spectrometers will be put into construction. The construction space of CSNS is limited, and a large amount of radiation shielding materials need to be used in the target station, thermal chamber, neutron pipeline system, sample frame, scattering frame, detection frame, neutron chopper, scintillation detector, etc., and these parts have different shapes , The structure is complex, which requires the shielding material to be flexible, arbitrarily cut and bendable, and adhesive. The neutron shielding materials used in the early co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08K7/26C08K3/38C08J9/10B29C35/04
CPCC08K7/26C08K3/38C08J9/103C08J9/0066B29C35/045C08J2203/04C08J2383/07C08L83/04Y02E30/30
Inventor 邓志华邓建国纪兰香白小峰
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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