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Neutron-resistant radiation shield plate and preparation method thereof

A radiation shielding and sheet technology, which is applied in the field of neutron radiation-resistant shielding sheet and its preparation, can solve the problems of difficult processing of boron carbide ceramics, high material brittleness, etc., and achieves the effect of good radiation shielding effect.

Inactive Publication Date: 2014-04-16
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a neutron radiation-resistant shielding plate and its preparation method, to solve the problem of neutron protection in low-to-medium intensity radiation environments and to solve the processing difficulties of boron carbide ceramics with the continuous processing and molding technology of large flat plates , The problem of high material brittleness

Method used

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specific Embodiment

[0028] The invention relates to a neutron radiation shielding-resistant polymer composite material plate and a preparation method thereof in a low-to-medium intensity irradiation environment, comprising the following components in parts by weight:

[0029] 55-94 parts of polyolefin resin

[0030] 4-43 parts of boron carbide powder

[0031] 0.5-1.5 parts of coupling agent

[0032] Antioxidant 0.5~1 part

[0033] Lubricant 0.5~2 parts

[0034] The polyolefin resin is one or both of polyethylene and polypropylene; the polyethylene is one of low-density polyethylene, ultra-low-density polyethylene, ultra-high molecular weight polyethylene, and high-density polyethylene. ; The boron carbide powder comprises from B 4 C to B 10.5 The homogeneous carboron compound of C has an average particle diameter of 2 to 50 μm. The optimum particle size is 10-20 μm; the coupling agent is silane coupling agent, titanate coupling agent, aluminate coupling agent, phosphate ester coupling agent...

Embodiment 1

[0048] In this embodiment, the following components by weight percentage are used: 60% of high-density polyethylene resin, 38% of boron carbide powder with an average particle size of 10 μm, 0.5% of silane coupling agent, β-(3,5-di-tert-butyl -4-Hydroxyphenyl) octadecyl propionate 1%, fatty acid 0.5%.

[0049] Add the components in the above proportions into a high-speed batching mixer, mix at a low speed for 30s, and then mix at a high speed for 120s; put the mixed premix in a Φ52 twin-screw for melt extrusion and granulation, and the temperature setting of the extruder: one stage Temperature 150°C, second stage temperature 200°C, third stage temperature 210°C, fourth stage temperature 200°C, fifth stage temperature 200°C, head temperature 220°C; host frequency: 35Hz; feeding frequency: 15Hz; pelletizer speed: 300r / min; the proportion of the strong shear section to the length of the entire screw: 30%; the performance test results of the prepared neutron radiation-resistant sh...

Embodiment 2

[0053] In this embodiment, the following components by weight percentage are used: 66% of high-density polyethylene resin, 30% of boron carbide powder with an average particle size of 15 μm, 1% of silane coupling agent, β-(3,5-di-tert-butyl -4-Hydroxyphenyl) stearyl propionate 1%, fatty acid 2%.

[0054] Add the components in the above proportions into a high-speed batching mixer, mix at a low speed for 30s, and then mix at a high speed for 150s; put the mixed premix in a Φ52 twin-screw to melt, extrude and granulate. The extruder temperature setting: one stage Temperature 160°C, second stage temperature 210°C, third stage temperature 190°C, fourth stage temperature 210°C, fifth stage temperature 190°C, head temperature 210°C; host frequency: 30Hz; feeding frequency: 13Hz; pelletizer speed: 330r / min; the proportion of the strong shear section to the length of the entire screw: 33%; the performance test results of the prepared neutron radiation-resistant shielding plate are tes...

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Abstract

The invention discloses a neutron-resistant radiation shield plate and a preparation method thereof. The neutron-resistant radiation shield plate comprises the following components in parts by weight: 55-94 parts of polyolefins resin, 4-43 parts of boron carbide powder, 0.5-1.5 parts of a coupling agent, 0.5-1 part of an anti-oxidant and 0.5-2 parts of lubricant. The preparation method of the neutron-resistant radiation shield plate comprises the following steps: 1) batching a composite material, wherein components are added into a high-speed batching stirrer, firstly mixture at a low speed is performed for 30 s, and then mixture at a high speed is performed for 120-180 s; 2) fundamentally pelletizing the composite material, wherein a premixed material is added into a double-screw extruder, and is subjected to smelting, extrusion, cooling, grain cutting and packing to obtain a composite material for the neutron-resistant radiation shield plate; 3) forming the plate, wherein the pelletized composite material is dried, is smelted and extruded by a single-screw extruding machine, is shaped by three-roll pressing, is stretched, drawn and cooled, and then is cut to obtain the neutron-resistant radiation shield plate.

Description

technical field [0001] The invention belongs to the technical field of neutron radiation-resistant shielding, and in particular relates to a neutron radiation-resistant shielding plate and a preparation method thereof in an irradiation environment with medium and low intensity. Background technique [0002] In the development and utilization of new energy, nuclear energy is currently a key development field in my country. The shielding and protection of nuclear power plant equipment has been highly valued by the country. Especially after the Fukushima nuclear power plant accident in Japan, people have paid more attention to the safety of nuclear power utilization. In nuclear reactor core components, neutron absorbing materials are important structural and functional materials next to nuclear fuel components. Boron carbide is a ceramic material with strong covalent bonds, and its molecule 10 B atom content is higher, 10 B atom has a strong neutron absorption ability, and do...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L23/12C08K13/02C08K3/38C08K5/54C08K5/10C08K5/521C08K5/55C08K5/13C08K5/20C08K5/526C08K5/09C08K5/098C08K5/01B29C47/92B29C48/92
CPCB29C48/92B29C2948/92704C08K3/38C08K2201/003C08L23/06C08L23/12C08L2201/08C08L2207/062C08L2207/064C08L2207/066C08L2207/068C08K13/02B29C48/04B29C48/385B29C48/397B29C48/40B29C48/625B29C48/875B29C2948/92552B29C2948/9259B29C2948/92885B29C2948/92895B29C2948/92923
Inventor 余雪江芦艾张启戎王建华马三田春蓉韩玉省陈贵胜张超
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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