CN113185840A - Flexible neutron shielding material and production process thereof - Google Patents
Flexible neutron shielding material and production process thereof Download PDFInfo
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- CN113185840A CN113185840A CN202110464099.0A CN202110464099A CN113185840A CN 113185840 A CN113185840 A CN 113185840A CN 202110464099 A CN202110464099 A CN 202110464099A CN 113185840 A CN113185840 A CN 113185840A
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- 239000000463 material Substances 0.000 title claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 8
- 239000000843 powder Substances 0.000 claims abstract description 42
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000000741 silica gel Substances 0.000 claims abstract description 39
- 229910002027 silica gel Inorganic materials 0.000 claims abstract description 39
- 229910052580 B4C Inorganic materials 0.000 claims abstract description 21
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229940075613 gadolinium oxide Drugs 0.000 claims abstract description 15
- 229910001938 gadolinium oxide Inorganic materials 0.000 claims abstract description 15
- CMIHHWBVHJVIGI-UHFFFAOYSA-N gadolinium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[Gd+3].[Gd+3] CMIHHWBVHJVIGI-UHFFFAOYSA-N 0.000 claims abstract description 15
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000010074 rubber mixing Methods 0.000 claims abstract description 12
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- 239000000853 adhesive Substances 0.000 claims abstract description 8
- 230000001070 adhesive effect Effects 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims abstract description 7
- 229920001971 elastomer Polymers 0.000 claims abstract description 5
- 239000005060 rubber Substances 0.000 claims abstract description 5
- 244000059549 Borneo rubber Species 0.000 claims abstract description 4
- 239000002270 dispersing agent Substances 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 239000002390 adhesive tape Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims 1
- 239000002131 composite material Substances 0.000 abstract 1
- 238000010521 absorption reaction Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000002834 transmittance Methods 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000011358 absorbing material Substances 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 238000005025 nuclear technology Methods 0.000 description 1
- 238000011275 oncology therapy Methods 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F1/00—Shielding characterised by the composition of the materials
- G21F1/02—Selection of uniform shielding materials
- G21F1/10—Organic substances; Dispersions in organic carriers
- G21F1/103—Dispersions in organic carriers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/221—Oxides; Hydroxides of metals of rare earth metal
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Compositions Of Macromolecular Compounds (AREA)
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Abstract
The invention discloses a flexible neutron shielding material and a production process thereof. The technical scheme of the invention is as follows: the composite material comprises the following components in percentage by weight: 30-80% of organic silica gel, 8-65% of boron carbide powder, 5-30% of gadolinium oxide powder, 5-30% of superfine lead powder and 0.2-2% of vulcanizing agent. The method comprises the following steps: a. pretreating boron carbide powder, gadolinium oxide powder and fine lead powder by using a powder dispersing agent; b. rubber mixing is carried out on the silica gel by using a rubber mixing mill, and boron carbide powder, gadolinium oxide powder or lead powder are gradually added in the rubber mixing process, and a vulcanizing agent is added at the same time; c. after the powder is put, continuously mixing the rubber for 3 hours to ensure that the powder and the silica gel are uniformly mixed to obtain refined raw silica gel; d. cutting refined raw silica gel into small blocks, putting the small blocks into a mold, heating the small blocks to 180-250 ℃, standing for 2 minutes to enable the small blocks to become mature silica gel, and opening the mold to obtain a silica gel plate; and (3) sticking the high-viscosity double-sided adhesive to a silica gel plate to prepare the flexible neutron shielding material.
Description
Technical Field
The invention relates to the technical field of neutron shielding, in particular to an organic silicon rubber flexible neutron shielding material.
Background
Neutron shielding is an important issue in the field of nuclear technology. Whether neutron instruments, neutron measurement experiments, or cancer therapy with neutrons, there are numerous situations where bendable flexible shielding materials are needed to block and absorb neutrons. The polymer matrix used as the flexible neutron shielding material comprises resin, rubber, silica gel, polyethylene and the like. There are a number of techniques and processes for flexible neutron shielding materials that aim to absorb neutrons while reducing secondary gamma emissions. For example, the selection of low hydrogen in the 'non-toxic environment-friendly wearable flexible low hydrogen neutron shielding material' is to reduce activation gamma. However, the flexible shielding material adhesive is a high molecular material and contains a lot of hydrogen inevitably, i.e. secondary gamma rays are inevitable. Therefore, how to design a flexible neutron shielding material capable of absorbing shielding neutrons and preventing secondary gamma rays and a production process thereof are problems to be solved by the present inventors.
Disclosure of Invention
Aiming at the defects in the prior art, the invention mainly aims to provide a flexible neutron shielding material capable of absorbing neutrons and preventing secondary gamma rays and a production process thereof.
In order to achieve the purpose, the invention provides the following technical scheme: a flexible neutron shielding material comprises the following components in percentage by weight: 30-80% of organic silica gel, 8-65% of boron carbide powder, 5-30% of gadolinium oxide powder, 5-30% of superfine lead powder and 0.2-2% of vulcanizing agent.
Preferably, the hardness of the organic silica gel is 40-70 degrees.
Preferably, the particle sizes of the boron carbide powder, the gadolinium oxide powder and the fine lead powder are all less than 1 μm.
A production process of a flexible neutron shielding material comprises the following steps:
a. pretreating boron carbide powder, gadolinium oxide powder and fine lead powder by using a powder dispersing agent;
b. rubber mixing is carried out on the silica gel by using a rubber mixing mill, and boron carbide powder, gadolinium oxide powder or lead powder are gradually added in the rubber mixing process, and a vulcanizing agent is added at the same time;
c. after the powder is put, continuously mixing the rubber for 3 hours to ensure that the powder and the silica gel are uniformly mixed to obtain refined raw silica gel;
d. cutting refined raw silica gel into small blocks, putting the small blocks into a mold, heating the small blocks to 180-250 ℃, standing for 2 minutes to enable the small blocks to become mature silica gel, and opening the mold to obtain a silica gel plate;
e. and (3) sticking the high-viscosity double-sided adhesive to a silica gel plate to prepare the flexible neutron shielding material.
Preferably, a vulcanizing agent is sprayed before the double-sided adhesive tape is pasted, so that the double-sided adhesive tape can be tightly adhered to the silica gel.
Compared with the prior art, the flexible double-sided adhesive has the advantages that the flexible double-sided adhesive can be adhered to a wall or equipment, can be bent and adhered, and has flexibility, wherein the proportion of boron carbide is as high as 60%, the density of the boron carbide is as high as 0.8g/cm3, a 2mm flexible shielding plate is used, the equivalent weight of boron carbide (ceramic) is more than 0.6mm, the transmission rate of 1eV neutrons is lower than 40%, the transmission rate of 0.1eV neutrons is lower than 5%, the shielding effect of reducing 1 magnitude of stray neutrons can be achieved for most of the stray neutrons, and the attached figure 1 is a transmission rate test chart. The neutron absorption device can achieve the purposes of neutron absorption and neutron shielding, can prevent secondary gamma rays, has flexibility and strength, can be bent at will when in use, and is resistant to irradiation and capable of adapting to a high-temperature environment.
Drawings
FIG. 1 is a graph of test transmission for a flexible neutron shielding material of the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1, the flexible neutron shielding material comprises the following components in percentage by weight: 30-80% of organic silica gel, 8-65% of boron carbide powder, 5-30% of gadolinium oxide powder, 5-30% of superfine lead powder and 0.2-2% of vulcanizing agent.
Preferably, the hardness of the organic silica gel is 40-70 degrees.
Preferably, the particle sizes of the boron carbide powder, the gadolinium oxide powder and the fine lead powder are all less than 1 μm.
A production process of a flexible neutron shielding material comprises the following steps:
a. pretreating boron carbide powder, gadolinium oxide powder and fine lead powder by using a powder dispersing agent;
b. rubber mixing is carried out on the silica gel by using a rubber mixing mill, and boron carbide powder, gadolinium oxide powder or lead powder are gradually added in the rubber mixing process, and a vulcanizing agent is added at the same time;
c. after the powder is put, continuously mixing the rubber for 3 hours to ensure that the powder and the silica gel are uniformly mixed to obtain refined raw silica gel;
d. cutting refined raw silica gel into small blocks, putting the small blocks into a mold, heating the small blocks to 180-250 ℃, standing for 2 minutes to enable the small blocks to become mature silica gel, and opening the mold to obtain a silica gel plate;
e. and (3) sticking the high-viscosity double-sided adhesive to a silica gel plate to prepare the flexible neutron shielding material.
Preferably, a vulcanizing agent is sprayed before the double-sided adhesive tape is pasted, so that the double-sided adhesive tape can be tightly adhered to the silica gel.
The flexible neutron shielding material can be used as a neutron absorbing material, can be pasted on a wall or equipment by matching with double-sided adhesive, can be bent and pasted, and has flexibility, wherein the proportion of boron carbide is up to 60%, and the density of boron carbide is up to 0.8g/cm3The 2mm flexible shielding plate is used, the equivalent weight of boron carbide (ceramic) is more than 0.6mm, the neutron transmittance to 1eV is lower than 40%, the neutron transmittance to 0.1eV is lower than 5%, the shielding effect of reducing 1 magnitude of stray neutrons can be achieved, and the attached figure 1 is a test transmittance graph. The neutron absorption device can achieve the purposes of neutron absorption and neutron shielding, does not contain hydrogen elements, can prevent secondary gamma rays, has flexibility and strength, can be bent at will when in use, and is resistant to irradiation and capable of adapting to a high-temperature environment.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (5)
1. The flexible neutron shielding material is characterized by comprising the following components in percentage by weight: 30-80% of organic silica gel, 8-65% of boron carbide powder, 5-30% of gadolinium oxide powder, 5-30% of superfine lead powder and 0.2-2% of vulcanizing agent.
2. The flexible neutron shielding material of claim 1, wherein: the hardness of the organic silica gel is 40-70 degrees.
3. The flexible neutron shielding material of claim 1, wherein: the particle sizes of the boron carbide powder, the gadolinium oxide powder and the fine lead powder are all less than 1 mu m.
4. A production process of a flexible neutron shielding material is characterized by comprising the following steps:
a. pretreating boron carbide powder, gadolinium oxide powder and fine lead powder by using a powder dispersing agent;
b. rubber mixing is carried out on the silica gel by using a rubber mixing mill, and boron carbide powder, gadolinium oxide powder or lead powder are gradually added in the rubber mixing process, and a vulcanizing agent is added at the same time;
c. after the powder is put, continuously mixing the rubber for 3 hours to ensure that the powder and the silica gel are uniformly mixed to obtain refined raw silica gel;
d. cutting refined raw silica gel into small blocks, putting the small blocks into a mold, heating the small blocks to 180-250 ℃, standing for 2 minutes to enable the small blocks to become mature silica gel, and opening the mold to obtain a silica gel plate;
e. and (3) sticking the high-viscosity double-sided adhesive to a silica gel plate to prepare the flexible neutron shielding material.
5. The flexible neutron shielding material of claim 4, wherein: and spraying a vulcanizing agent before the double-sided adhesive tape is pasted to ensure that the double-sided adhesive tape can be tightly adhered to the silica gel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110464099.0A CN113185840A (en) | 2021-04-28 | 2021-04-28 | Flexible neutron shielding material and production process thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110464099.0A CN113185840A (en) | 2021-04-28 | 2021-04-28 | Flexible neutron shielding material and production process thereof |
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| CN113185840A true CN113185840A (en) | 2021-07-30 |
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| CN202110464099.0A Pending CN113185840A (en) | 2021-04-28 | 2021-04-28 | Flexible neutron shielding material and production process thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113698773A (en) * | 2021-10-15 | 2021-11-26 | 中国建材检验认证集团安徽有限公司 | Flame-retardant silicone rubber flexible neutron shielding material and preparation method thereof |
| CN114292108A (en) * | 2021-11-29 | 2022-04-08 | 华能核能技术研究院有限公司 | Boron carbide-gadolinium oxide neutron absorber material for control rod and preparation method thereof |
Citations (6)
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|---|---|---|---|---|
| GB920128A (en) * | 1958-09-02 | 1963-03-06 | Elektroschmelzwerke Kempten G | The screening of neutrons and rays |
| CN1089055A (en) * | 1992-12-26 | 1994-07-06 | 天津纺织工学院 | Neutron and gamma-ray radiation shielding material |
| RU2010141326A (en) * | 2010-10-07 | 2012-04-20 | Федеральное государственное унитарное предприятие "Ордена Ленина и ордена Трудового Красного Знамени научно-исследовательский инстит | COMPOSITION FOR NEUTRON PROTECTION BASED ON POLYDIMETHYL SILOXAN |
| CN104744945A (en) * | 2015-03-24 | 2015-07-01 | 南京航空航天大学 | Neutron shield material with flame-retardant neutron shield heat-shielding performance and preparation method thereof |
| CN107082965A (en) * | 2017-05-24 | 2017-08-22 | 北京市射线应用研究中心 | A kind of anti-neutron composite shielding material of self-adhering-type and preparation method and application |
| CN112574533A (en) * | 2020-12-22 | 2021-03-30 | 江苏中海华核环保有限公司 | High-temperature-resistant borosilicate resin neutron shielding material and preparation process thereof |
-
2021
- 2021-04-28 CN CN202110464099.0A patent/CN113185840A/en active Pending
Patent Citations (6)
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| GB920128A (en) * | 1958-09-02 | 1963-03-06 | Elektroschmelzwerke Kempten G | The screening of neutrons and rays |
| CN1089055A (en) * | 1992-12-26 | 1994-07-06 | 天津纺织工学院 | Neutron and gamma-ray radiation shielding material |
| RU2010141326A (en) * | 2010-10-07 | 2012-04-20 | Федеральное государственное унитарное предприятие "Ордена Ленина и ордена Трудового Красного Знамени научно-исследовательский инстит | COMPOSITION FOR NEUTRON PROTECTION BASED ON POLYDIMETHYL SILOXAN |
| CN104744945A (en) * | 2015-03-24 | 2015-07-01 | 南京航空航天大学 | Neutron shield material with flame-retardant neutron shield heat-shielding performance and preparation method thereof |
| CN107082965A (en) * | 2017-05-24 | 2017-08-22 | 北京市射线应用研究中心 | A kind of anti-neutron composite shielding material of self-adhering-type and preparation method and application |
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Non-Patent Citations (2)
| Title |
|---|
| TONGUÇ ÖZDEMIR等: "Hexagonal Boron Nitride and Polydimethylsiloxane: A Ceramic Rubber Composite Material for Neutron Shielding" * |
| 赵盛等: "中子及伽马射线复合屏蔽材料的研究进展" * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113698773A (en) * | 2021-10-15 | 2021-11-26 | 中国建材检验认证集团安徽有限公司 | Flame-retardant silicone rubber flexible neutron shielding material and preparation method thereof |
| CN114292108A (en) * | 2021-11-29 | 2022-04-08 | 华能核能技术研究院有限公司 | Boron carbide-gadolinium oxide neutron absorber material for control rod and preparation method thereof |
| CN114292108B (en) * | 2021-11-29 | 2023-01-31 | 华能核能技术研究院有限公司 | Boron carbide-gadolinium oxide neutron absorber material for control rod and preparation method thereof |
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Application publication date: 20210730 |