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A pourable silicone rubber-based heat-resistant shielding material and preparation method thereof

A technology of shielding material and silicone rubber, which is applied in the field of castable silicone rubber-based heat-resistant shielding material and its preparation, can solve problems such as complex process, and achieve the effects of low hardness, excellent high and low temperature resistance, and small expansion and contraction

Active Publication Date: 2020-12-25
BEIJING RADIATION APPL RES CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of traditional polyethylene shielding materials generally requires multiple molding processes such as molding, machining, and assembly, and the process is relatively complicated.

Method used

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  • A pourable silicone rubber-based heat-resistant shielding material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment provides a pourable silicone rubber-based heat-resistant shielding material, the raw material composition of which includes: 100 parts by weight of hydroxyl-terminated dimethyl silicone oil (weight average molecular weight: 48,000), 7.5 parts by weight of fumed silica, carbonized 4 parts by weight of boron, 60 parts by weight of magnesium hydroxide, 3 parts by weight of ethyl orthosilicate, and 2 parts by weight of dibutyltin dilaurate.

[0032] Above-mentioned boron carbide is modified according to the following steps:

[0033] Dissolve an appropriate amount of boron carbide powder in a NaOH solution with a concentration of 5 mol / L, stir in an oil bath at 120°C for 24 hours, rinse and filter until neutral, and dry in an oven at 90°C for 8 hours; the dried boron carbide powder Prepare a suspension, stir magnetically at 70°C for 30 minutes; add the silane coupling agent to the suspension, stir and reflux at 70°C for 4 hours, then dry in an oven at 90°C to...

Embodiment 2

[0041] This embodiment provides a pourable silicone rubber-based heat-resistant shielding material, the raw material composition of which includes: 100 parts by weight of hydroxyl-terminated dimethyl silicone oil (weight average molecular weight: 48,000), 7.5 parts by weight of fumed silica, carbonized 4 parts by weight of boron, 120 parts by weight of magnesium hydroxide, 3 parts by weight of ethyl orthosilicate, and 2 parts by weight of dibutyltin dilaurate.

[0042] The modification treatment of the above-mentioned boron carbide is the same as in Example 1.

[0043] The pourable silicone rubber-based heat-resistant shielding material is prepared through the following steps:

[0044] Preparation of component A: add fumed white carbon black to an appropriate amount of hydroxy silicone oil, stir mechanically at room temperature for 30 minutes, then add magnesium hydroxide and modified boron carbide in turn, vacuum defoam for 1 hour, and finally add ethyl orthosilicate, Stir e...

Embodiment 3

[0050] This embodiment provides a pourable silicone rubber-based heat-resistant shielding material, the raw material composition of which includes: 100 parts by weight of hydroxyl-terminated dimethyl silicone oil (weight average molecular weight: 48,000), 7.5 parts by weight of fumed silica, carbonized 100 parts by weight of boron, 3 parts by weight of ethyl orthosilicate, and 2 parts by weight of dibutyltin dilaurate.

[0051] The modification treatment of the above-mentioned boron carbide is the same as in Example 1.

[0052] The pourable silicone rubber-based heat-resistant shielding material is prepared through the following steps:

[0053] Preparation of component A: add fumed white carbon black to an appropriate amount of hydroxy silicone oil, stir mechanically at room temperature for 30 minutes, then add modified boron carbide, vacuum degassing for 1 hour, and finally add tetraethyl orthosilicate, stir evenly at room temperature for 30 minutes, Vacuum defoaming for 0.5...

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Abstract

The invention provides a castable silicone rubber base temperature resistant shielding material and a preparation method thereof. The raw materials of the castable silicone rubber base temperature resistant shielding material comprise, by weight, 100 parts of hydroxy silicone oil, 2 to 25 parts of reinforcing agents, 2 to 100 parts of neutron protecting agents, 2 to 10 parts of crosslinking agents, and 1 to 3 parts of catalysts. The invention also provides the preparation method of the above-mentioned castable silicone rubber base temperature resistant shielding material. The castable siliconerubber base temperature resistant shielding material provided by the invention has excellent comprehensive performance, the preparation method is simple, the casting molding can be realized, and thematerial has great advantages in production, construction, installation and the like.

Description

technical field [0001] The invention relates to a pourable silicone rubber-based temperature-resistant shielding material and a preparation method thereof, belonging to the technical field of shielding material preparation. Background technique [0002] With the rapid development of nuclear technology, nuclear energy, as a clean and efficient energy source, is gradually entering people's field of vision. The development of nuclear energy is an important direction for my country to build an environment-friendly country. At the same time, how to solve the radiation problem generated by nuclear equipment has become increasingly important. Among the radiation produced by nuclear equipment, special attention should be paid to gamma rays and neutron radiation with high penetrating power. The use of shielding materials can effectively prevent neutron radiation and gamma rays from harming external equipment and human body. [0003] Due to the advantages of controllable density an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21F1/10
CPCG21F1/103
Inventor 曹可张龙孟宪芳秦培中陆永俊王连才曾心苗
Owner BEIJING RADIATION APPL RES CENT
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