阅读说明：本技术 一种高含钨量钨硼交联聚乙烯新型复合屏蔽材料 (Novel composite shielding material of tungsten boron crosslinked polyethylene with high tungsten content ) 是由 彭祥阳 路广遥 匡少宝 侯硕 魏旭东 陈帅 刘青松 周建明 戚进祥 丁祥彬 赵均 于 2019-10-10 设计创作，主要内容包括：本发明提供一种所述高含钨量钨硼交联聚乙烯新型复合屏蔽材料,其组分按质量配比包含：钨粉60-85％,碳化硼1％-5％,交联聚乙烯10-40％,抗氧化剂0.1-5％,偶联剂0.5-2.5％。实施本发明的实施例,其具有安全性好、耐热性耐腐蚀性能好,且能制成大尺寸等优点。(The invention provides a novel high-tungsten-content tungsten-boron crosslinked polyethylene composite shielding material which comprises the following components in parts by mass: 60-85% of tungsten powder, 1-5% of boron carbide, 10-40% of crosslinked polyethylene, 0.1-5% of antioxidant and 0.5-2.5% of coupling agent. The embodiment of the invention has the advantages of good safety, good heat resistance and corrosion resistance, large size and the like.)

1. The novel composite shielding material of the tungsten boron crosslinked polyethylene with high tungsten content is characterized in that: the novel composite shielding material of the high tungsten content tungsten boron crosslinked polyethylene comprises the following components in percentage by mass: 60-85% of tungsten powder, 1-5% of boron carbide, 10-40% of crosslinked polyethylene, 0.1-5% of antioxidant and 0.5-2.5% of coupling agent.

2. The novel composite shielding material of the high tungsten content tungsten boron crosslinked polyethylene of claim 1, wherein: the density of the novel tungsten boron crosslinked polyethylene composite shielding material with high tungsten content is 3.6-5.6g/cm³。

3. The novel composite shielding material of the high tungsten content tungsten boron crosslinked polyethylene of claim 2, wherein: the crosslinked polyethylene is ultrahigh molecular weight polyethylene (UHMWPE) which has a three-dimensional network structure and has a particle size of 80-450 meshes; the particle size of the tungsten powder is 100-300 meshes; the particle size of the boron carbide powder is 150-350 meshes.

4. The novel composite shielding material of the high tungsten content tungsten boron crosslinked polyethylene of claim 3, wherein: the antioxidant is one or more of Irganox1010, FB1520, 2002, PS802FL and Irgafos 168.

5. The novel composite shielding material of the high tungsten content tungsten boron crosslinked polyethylene of claim 4, wherein: the coupling agent is one or a combination of KH602, KH792, KH902, KH580 and KH 560.

6. The novel composite shielding material of the high tungsten content tungsten boron crosslinked polyethylene of claim 5, wherein: the novel composite shielding material of the high tungsten content tungsten boron crosslinked polyethylene adopts a one-step forming process technology, and the specification and the size of the obtained product are as follows: length x width x thickness is: (300-3500 mm) × (200-2000 mm) × (10-260 mm).

Technical Field

The invention relates to the technical field of nuclear radiation shielding protection, in particular to a novel composite shielding material of tungsten boron crosslinked polyethylene with high tungsten content, which can be used for shielding protection of neutrons and gamma rays.

Background

The shielding material is mainly used for blocking and weakening gamma rays, neutron radiation and the like which cause harm to human bodies, and is an effective means for guaranteeing the radiation safety of personnel, equipment and environment. The radiation protection device is mainly used for radiation protection in the technical field of nuclear power, and can also be used in other fields needing radiation protection, such as radiation protection in fields or areas of medical treatment, nuclear physics laboratories and the like.

Although the moderation and absorption of neutrons and the attenuation of gamma rays by the nuclear radiation shielding material are important indexes for evaluating the shielding efficiency of the shielding material, the special size and performance requirements of the current and future practical nuclear engineering application are difficult to meet only by using the shielding material with high shielding efficiency.

With the continuous development of nuclear power construction and the wide application of nuclear energy technology, the application research satisfying the miniaturization of nuclear reactors is increasingly concerned. In the prior art, the traditional research and application of neutron and gamma-ray shielding materials mainly use lead-boron-polyethylene materials, but lead is poor in environmental friendliness and relatively high in harm to human bodies, and a weak absorption region exists. Meanwhile, the existing lead-boron polyethylene shielding material has poor heat resistance, low Vicat softening point (about 100 ℃), small molding size, and the thickness of the existing plate is generally below 100mm, so that the requirements on volume reduction and weight reduction in the application of nuclear reactor miniaturization cannot be met.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a novel tungsten-boron crosslinked polyethylene composite shielding material with high tungsten content, which has the advantages of good safety, good heat resistance and corrosion resistance, and large size.

In order to solve the technical problems, the invention provides a novel high-tungsten-content tungsten-boron crosslinked polyethylene composite shielding material which comprises the following components in parts by mass: 60-85% of tungsten powder, 1-5% of boron carbide, 10-40% of crosslinked polyethylene, 0.1-5% of antioxidant and 0.5-2.5% of coupling agent.

Preferably, the density of the novel high-tungsten-content tungsten-boron crosslinked polyethylene composite shielding material is 3.6-5.6g/cm³。

Preferably, the crosslinked polyethylene is ultrahigh molecular weight polyethylene (UHMWPE) having a three-dimensional network structure with a particle size of 80-450 mesh; the particle size of the tungsten powder is 100-300 meshes; the particle size of the boron carbide powder is 150-350 meshes.

Preferably, the antioxidant is one or more of Irganox1010, FB1520, 2002, PS802FL and Irgafos 168.

Preferably, the coupling agent is one or more of KH602, KH792, KH902, KH580 and KH 560.

Preferably, the novel high-tungsten-content tungsten-boron crosslinked polyethylene composite shielding material adopts a one-step forming process technology, and the specification and the size of the obtained product are as follows: length x width x thickness is: (300-3500 mm) × (200-2000 mm) × (10-260 mm).

The embodiment of the invention has the following beneficial effects:

the tungsten-boron-polyethylene composite material provided by the invention adopts tungsten powder as a main component, and compared with lead-boron-polyethylene, the tungsten-boron-polyethylene composite material is good in environmental friendliness (lead pollution cannot occur in the production process), and isotopes or secondary radiation cannot be generated after rays are absorbed; the tungsten-boron crosslinked polyethylene composite shielding material has the characteristics of large absorption section, high neutron moderation efficiency, gamma-ray and neutron comprehensive shielding effect, super-conventional structure size, good mechanical property, environmental stress cracking resistance, corrosion resistance and the like, so that the tungsten-boron polyethylene with high tungsten content in unit volume has higher nuclear radiation shielding efficiency;

the tungsten boron crosslinked polyethylene composite shielding material provided by the invention has good heat resistance temperature (the Vicat softening point is more than 130 ℃), and the use temperature of the material can be effectively increased;

the tungsten-boron crosslinked polyethylene composite shielding material provided by the invention is prepared by adopting a die pressing one-step forming technology, the manufacturing of a large-size shielding material is realized, the characteristic length and width can be not lower than 1900mmX1500mm, the thickness and characteristic dimension can be not lower than 240mm, the size limit of the traditional shielding material is broken through, the installed capacity of the shielding material in a small modular nuclear reactor is reduced, the splicing gap is reduced, and the ray leakage caused by material splicing can be effectively reduced.

Detailed Description

The novel composite shielding material of the tungsten boron crosslinked polyethylene with high tungsten content provided by the invention is explained in the following.

The invention provides a novel high-tungsten-content tungsten-boron crosslinked polyethylene composite shielding material which comprises the following components in parts by mass: 60-85% of tungsten powder, 1-5% of boron carbide, 10-40% of crosslinked polyethylene, 0.1-5% of antioxidant and 0.5-2.5% of coupling agent.

Wherein the density of the novel tungsten boron crosslinked polyethylene composite shielding material with high tungsten content is 3.6-5.6g/cm 3.

Specifically, the crosslinked polyethylene has a three-dimensional network structure, the particle size of the crosslinked polyethylene is 80-450 meshes, the particle size of the tungsten powder is 100-300 meshes, and the particle size of the boron carbide powder is 150-350 meshes.

The antioxidant is one or more of Irganox1010, FB1520, 2002, PS802FL and Irgafos 168.

The coupling agent is one or a combination of KH602, KH792, KH902, KH580 and KH 560.

Specifically, the novel composite shielding material of the high tungsten content tungsten boron crosslinked polyethylene adopts a one-step forming process technology, and the specification and the size of the obtained product are as follows: the length is 300 to 3500mm, the width is 200 to 2000mm, and the thickness is 10 to 260 mm.

More specifically, in a specific example, the novel high-tungsten-content tungsten-boron crosslinked polyethylene composite shielding material comprises the following components in parts by mass: 85% of tungsten powder, 3% of boron carbide, 11.4% of crosslinked polyethylene, 0.1% of antioxidant and 0.5% of coupling agent. Wherein, the crosslinked polyethylene adopts GK01 ultra-high molecular weight polyethylene (UHMWPE) manufactured by Beijing Yanshan division of China petrochemical company Limited, and the tungsten powder is prepared by reducing tungsten oxide with hydrogen, which accords with the FW-2 regulation in GB/T3458; b is₄The chemical composition of the C powder meets the requirements of ASTM C750 TYPE 1.

The particle size of tungsten powder used in the novel tungsten-boron crosslinked polyethylene composite shielding material with high tungsten content is 100 meshes, the particle size of boron carbide powder is 150 meshes, the particle size of crosslinked polyethylene is 100 meshes, the antioxidant is Irgafos168, and the coupling agent is KH 602.

The novel composite shielding material of the tungsten boron crosslinked polyethylene with high tungsten content and the specification size of 2000mm multiplied by 1600mm multiplied by 120mm is prepared by the one-step forming process technology according to the components

It can be understood that the polyethylene used in this embodiment is ultra-high molecular weight polyethylene, which has better strength, heat resistance and aging resistance than low density polyethylene and high density polyethylene, while the traditional shielding material in the prior art is made of low density polyethylene and high density polyethylene, which have lower heat resistance temperature.

Experiments show that when the lead-boron polyethylene in the prior art is improved from 3.4 to about 5.0, the gamma shielding performance is improved to a certain extent, but the fast neutron shielding effect is reduced. After the density of the tungsten-boron-polyethylene obtained by the embodiment of the invention is improved, the shielding effect of fast neutrons and gamma rays is correspondingly improved.

The density uniformity of the tungsten-boron-polyethylene is detected by adopting the GB/T1033-2008 standard, and the uniformity of the tungsten-boron-polyethylene obtained by the embodiment of the invention is good according to the detection result.

The Vicat softening temperature of the tungsten boron polyethylene obtained by the embodiment of the invention can reach over 130 ℃ by testing the Vicat softening temperature according to the method A50 in GB/T1633-2000 standard.

In addition, the tensile strength, the impact strength and the shear strength of the tungsten-boron polyethylene obtained by the embodiment of the invention are tested, and the strength of the tungsten-boron polyethylene is improved compared with that of the existing lead-boron polyethylene.

The finished product is photographed by a metallographic microscope to show that lead powder, tungsten powder and boron carbide powder in the shielding material prepared from the tungsten-boron-polyethylene obtained by the embodiment of the invention are uniformly distributed in the polyethylene matrix, the defects of no fusion, no crack, no hole and the like are obviously generated in the material, and the structure of the shielding material is compact.

The boron polyethylene obtained by the embodiment of the invention has good effect when being subjected to an aging test.

Meanwhile, an irradiation resistance test was performed. By adopting a stacking test, the shielding material prepared from the tungsten-boron polyethylene obtained in the embodiment of the invention has the initial tensile strength of 12.6MPa and the accumulative neutron of 1.0E +17n/cm²The tensile strength was 15.2MPa under the condition of γ measurement of 1.3E +6Gy, the tensile strength was 7.6MPa under the condition of cumulative neutron of 1.0E +18n/cm2 and γ measurement of 1.3E +7Gy, and no powdering phenomenon was observed.

The embodiment of the invention has the following beneficial effects:

the tungsten-boron-polyethylene composite material provided by the invention adopts tungsten powder as a main component, and compared with lead-boron-polyethylene, the tungsten-boron-polyethylene composite material is good in environmental friendliness (lead pollution cannot occur in the production process), and isotopes or secondary radiation cannot be generated after rays are absorbed; the tungsten-boron crosslinked polyethylene composite shielding material has the characteristics of large absorption section, high neutron moderation efficiency, gamma-ray and neutron comprehensive shielding effect, super-conventional structure size, good mechanical property, environmental stress cracking resistance, corrosion resistance and the like, so that the tungsten-boron polyethylene with high tungsten content in unit volume has higher nuclear radiation shielding efficiency;

the tungsten boron crosslinked polyethylene composite shielding material provided by the invention has good heat resistance temperature (the Vicat softening point is more than 130 ℃), and the use temperature of the material can be effectively increased;

the tungsten-boron crosslinked polyethylene composite shielding material provided by the invention is prepared by adopting a die pressing one-step forming technology, the manufacturing of a large-size shielding material is realized, the characteristic length and width can be not lower than 1900mmX1500mm, the thickness and characteristic dimension can be not lower than 240mm, the size limit of the traditional shielding material is broken through, the installed capacity of the shielding material in a small modular nuclear reactor is reduced, the splicing gap is reduced, and the ray leakage caused by material splicing can be effectively reduced.

The above description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the claims, therefore, other equivalent changes and modifications should be made without departing from the spirit of the present invention.