CN104292609A - Heat-resistant composite shielding material and preparation method thereof - Google Patents
Heat-resistant composite shielding material and preparation method thereof Download PDFInfo
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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
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
- C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
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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
- C08K3/02—Elements
- C08K3/08—Metals
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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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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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
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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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2234—Oxides; Hydroxides of metals of lead
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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
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
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- 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
Abstract
The invention discloses a heat-resistant composite shielding material. The heat-resistant composite shielding material consists of the following components in percentage by weight: 13.5-17.7 percent of polypropylene, 1-2 percent of boron carbide powder, 0.3-0.5 percent of a silane coupling agent and 81-84 percent of lead powder or lead oxide powder. The invention further discloses a preparation method of the heat-resistant composite shielding material. The heat-resistant composite shielding material has the advantages that through adoption of the polypropylene which has a high melting point and high heat resistance, the heat resistance is enhanced; and the content of boron carbide and the content of lead are optimized, so that the shielding material has better neutron and gamma ray comprehensive shielding performance.
Description
Technical field
The present invention relates to nuclear industry field, be specifically related to a kind of neutron, gamma ray shielding material, particularly relate to a kind of resistant to elevated temperatures neutron, gamma ray shielding material and preparation method thereof.
Background technology
At present, conventional neutron, gamma ray shielding material have loaded concrete, boron polyethylene, and boron steel is several.Loaded concrete is better to gamma ray shielding ability, and low price, resistance toheat is good, but its neutron shielding properties is poor.Thermal neutron and the gamma ray shielding performance of boron steel are good, and mechanical property is good, high temperature resistant, but it is poor to high-energy neutron shielding properties.Boron polyethylene is mainly used in neutron shielding, bad to gamma-ray shield effectiveness.
" nuclear power engineering " 1994, Vol.15 No.4 (371-374) discloses a kind of lead boron polyethylene shielding material, achieving gamma-ray shielding by adding lead, achieving the shielding to thermal neutron by norbide, overcoming the deficiency that above-mentioned shielding material shielding properties is single.Contriver finds in practice, when this lead boron polyethylene shielding material being used in the composite shielding field containing thermal source, although can normally work in the short period of time, but after longer active time, screen material block cognition deforms, splicing seams width increases, thus neutron and gamma-rays are revealed in a large number.
In addition, shielding material disclosed in application number " 92114783.X " patent of invention adopts the shielding of the realization such as graphite, dysprosium oxide to fast neutron, this bi-material is not best to fast neutron shielding effect, and in material disclosed in this patent of invention, shielding gamma-rays material component, lower than 40%, can cause its gamma ray shielding poor performance.
Summary of the invention
Namely object of the present invention is that overcome existing lead boron polyethylene shielding material easily deforms after long-time military service under the environment having thermal source, to gamma ray shielding poor performance, and have employed the deficiency that material to fast neutron shielding effect and bad carries out fast neutron shielding, a kind of heat-resisting composite shielding material is provided.
Present invention also offers a kind of preparation method of heat-resisting composite shielding material.
Object of the present invention is achieved through the following technical solutions:
A kind of heat-resisting composite shielding material, is made up of the lead powder of the polypropylene of 13.5% ~ 17.7% parts by weight, the boron carbide powder of 1% ~ 2% parts by weight, the silane coupling agent of 0.3% ~ 0.5% parts by weight and 81% ~ 84% parts by weight or lead oxide powder.
Contriver finds in real work, " nuclear power engineering " 1994, Vol.15 No.4 (371-374) discloses a kind of lead boron polyethylene shielding material, it is in the composite shielding field having thermal source after operate longer, there will be the situation that shielding material block deforms, splicing seams width increases, and causes neutron and gamma-rays to be revealed in a large number.
Contriver is in order to address this problem, traditional lead boron polyethylene shielding material is studied, the heat-drawn wire of the lead boron polyethylene shielding material that final discovery is traditional is between 80 DEG C ~ 85 DEG C, when its be operated in envrionment temperature lower than the composite shielding field of 60 DEG C in time, envrionment temperature can't impact it, and it normally works for a long time and can be protected.But, traditional lead boron polyethylene shielding material is used in border temperature higher than in the composite shielding field of 60 DEG C time, higher envrionment temperature can cause it to produce distortion inconspicuous, initial stage is inconspicuous under arms in this distortion, along with the increase of active time, distortion accumulates gradually, finally causes splicing seams width to increase, causes neutron and gamma-rays to be revealed in a large number.
Contriver find the heat-drawn wire of shielding material too low be the reason causing splicing seams width to increase after, existing shielding material is improved, adopt the higher polypropylene of texturing temperature to substitute the lower polyethylene of texturing temperature, make heat-drawn wire of the present invention be increased to more than 115 DEG C.When the present invention is on active service in the composite shielding field that envrionment temperature is higher, envrionment temperature can't impact it, stopped the generation of micro-deformation, thus after solving long-time military service, shielding material block deforms, the problem that the increase of splicing seams width causes neutron and gamma-rays to be revealed in a large number.
In the patent of invention of application number " 92114783.X ", polyethylene as molding substance migration, and adopts the materials such as a large amount of graphite, dysprosium oxide to shield fast neutron.The material such as graphite, dysprosium oxide is bad to the shield effectiveness of fast neutron, the use of the materials such as a large amount of mould graphite, dysprosium oxide also causes the consumption of the gamma ray shielding materials such as lead to be restricted, and finally makes the shielding material of this disclosure of the invention lower to gamma-ray shielding properties.Trace it to its cause, because this contriver does not recognize, containing a large amount of hydrogen atoms in polyethylene, polypropylene, the hydrogen atom contained in polyethylene, polypropylene can realize well shielding to fast neutron, there is no need material such as recycling graphite, dysprosium oxide etc. at all and shields fast neutron.In the invention, fast neutron shield effectiveness is brought by polyethylene, and the poor material such as graphite, dysprosium oxide of fast neutron shield effectiveness to raising fast neutron shielding properties without any help.
Contriver is through research, on the basis finding the problems referred to above, in the present invention, eliminate the fast neutron such as graphite, dysprosium oxide shield, thus add the content of lead powder or lead oxide powder, make its components by weight percent reach 81% ~ 84%, thus on the basis that fast neutron is effectively shielded, strengthen gamma-ray shielding properties.
Further, the particle diameter of described boron carbide powder, lead powder and lead oxide powder is 50-150 micron.At present, lead-boron polythene production lead powder and boron carbide powder particle diameter are less than 45 microns, and lead powder and norbide powder easily fly upward everywhere in the fabrication process, impact environment, are unfavorable for that staff's is healthy.The particle diameter of boron carbide powder, lead powder and lead oxide powder is increased, flying upward of boron carbide powder, lead powder and lead oxide powder can be reduced, meanwhile, mobility during powder mixing can also be increased.
The particle diameter of boron carbide powder, lead powder and lead oxide powder being defined as 50-150 micron, boron carbide powder, lead powder and the lead oxide powder homogeneity when mixing can not being affected.
Further, polyacrylic parts by weight are preferably 17.5%, and the parts by weight of norbide are preferably 1%, and the parts by weight of silane coupling agent are preferably 0.5%, and the parts by weight of lead powder are preferably 81%.
A preparation method for heat-resisting composite shielding material, comprises the following steps:
A. batch mixing, by lead powder or lead oxide powder, boron carbide powder, silane coupling agent joins in mixer and mixes, and obtains compound;
B. mixing, compound and polypropylene are joined and carries out mixing in high speed milling device, obtain mixing materials;
C. granulation, after mixing materials being pulverized, sends into extruding pelletization in tablets press, obtains pellet;
D. shaping, clamp-on in forming mould by pellet after plasticizing, then compression moulding, after naturally cooling to room temperature, the demoulding obtains heat-resisting composite shielding material block.
Further, the parts by weight of lead powder or lead oxide powder are 81% ~ 84%, and the parts by weight of boron carbide powder are 1% ~ 2%, and the parts by weight of silane coupling agent are 0.3% ~ 0.5%, and polyacrylic parts by weight are 13.5% ~ 17.7%.
Further, polyacrylic parts by weight are preferably 17.5%, and the parts by weight of norbide are preferably 1%, and the parts by weight of silane coupling agent are preferably 0.5%, and the parts by weight of lead powder are preferably 81%.
Further, in described step B, melting temperature is 160 DEG C ~ 170 DEG C.
Further, in described step C, under 200 DEG C ~ 210 DEG C conditions, carry out extruding pelletization.
Further, in described step D, 180 DEG C ~ 190 DEG C, be pressed under 5Mpa ~ 10MPa condition.
In sum, advantage of the present invention and beneficial effect are:
1. have employed fusing point high, the polypropylene that resistance toheat is good, make the present invention possess better resistance toheat;
2. eliminate the fast neutron such as graphite, dysprosium oxide shield, thus add the content of lead powder or lead oxide powder, make its components by weight percent reach 81% ~ 84%, thus on the basis that fast neutron is effectively shielded, strengthen gamma-ray shielding properties;
3. the particle diameter of boron carbide powder, lead powder and lead oxide powder is defined as 50-150 micron, can on the basis not affecting boron carbide powder, lead powder and the lead oxide powder homogeneity when mixing, reduce boron carbide powder, lead powder and lead oxide powder and fly upward situation in the course of processing, thus more friendly to environment.
Embodiment
In order to make those skilled in the art understand the present invention better, carry out clear, complete description by the technical scheme in the embodiment of the present invention below.Apparent, embodiment described below is only the part in the embodiment of the present invention, instead of all.Based on the embodiment that the present invention records, other all embodiment that those skilled in the art obtain when not paying creative work, all in the scope of protection of the invention.
Embodiment 1:
A kind of heat-resisting composite shielding material, by the lead powder of 81% parts by weight, the boron carbide powder of 1% parts by weight, the silane coupling agent of 0.3% parts by weight and the polypropylene composition of 17.7% parts by weight.The particle diameter of lead powder and boron carbide powder is 50 microns.
Its preparation method is as follows:
A. batch mixing, by 8100g lead powder, 100g boron carbide powder, 30g silane coupling agent joins in mixer and mixes, and obtains compound;
B. mixing, compound and 1770g polypropylene are joined in high speed milling device, carries out mixing at 160 DEG C of temperature, obtain mixing materials;
C. granulation, after mixing materials being pulverized, to send in tablets press extruding pelletization at 200 DEG C of temperature, obtains pellet;
D. shaping, clamp-on in forming mould by pellet after plasticizing, then 180 DEG C, compression moulding under 5Mpa condition, after naturally cooling to room temperature, the demoulding obtains heat-resisting composite shielding material block.
Embodiment 2:
A kind of heat-resisting composite shielding material, by the lead powder of 84% parts by weight, the boron carbide powder of 2% parts by weight, the silane coupling agent of 0.5% parts by weight and the polypropylene composition of 13.5% parts by weight.The particle diameter of lead powder and boron carbide powder is 100 microns.
Its preparation method is as follows:
A. batch mixing, by 8400g lead powder, 200g boron carbide powder, 50g silane coupling agent joins in mixer and mixes, and obtains compound;
B. mixing, compound and 1350g polypropylene are joined in high speed milling device, carries out mixing at 165 DEG C of temperature, obtain mixing materials;
C. granulation, after mixing materials being pulverized, to send in tablets press extruding pelletization at 205 DEG C of temperature, obtains pellet;
D. shaping, clamp-on in forming mould by pellet after plasticizing, then 190 DEG C, compression moulding under 7Mpa condition, after naturally cooling to room temperature, the demoulding obtains heat-resisting composite shielding material block.
Embodiment 3:
A kind of heat-resisting composite shielding material, by the lead oxide powder of 81% parts by weight, the boron carbide powder of 1% parts by weight, the silane coupling agent of 0.5% parts by weight and the polypropylene composition of 17.5% parts by weight.The particle diameter of lead powder and boron carbide powder is 150 microns.
Its preparation method is as follows:
A. batch mixing, by 8100g lead powder, 100g boron carbide powder, 50g silane coupling agent joins in mixer and mixes, and obtains compound;
B. mixing, compound and 1750g polypropylene are joined in high speed milling device, carries out mixing at 170 DEG C of temperature, obtain mixing materials;
C. granulation, after mixing materials being pulverized, to send in tablets press extruding pelletization at 210 DEG C of temperature, obtains pellet;
D. shaping, clamp-on in forming mould by pellet after plasticizing, then 190 DEG C, compression moulding under 10Mpa condition, after naturally cooling to room temperature, the demoulding obtains heat-resisting composite shielding material block.
Embodiment 4:
A kind of heat-resisting composite shielding material, by the lead powder of 82% parts by weight, the boron carbide powder of 2% parts by weight, the silane coupling agent of 0.4% parts by weight and the polypropylene composition of 15.6% parts by weight.The particle diameter of lead powder and boron carbide powder is 150 microns.
Its preparation method is as follows:
A. batch mixing, by 8200g lead powder, 200g boron carbide powder, 40g silane coupling agent joins in mixer and mixes, and obtains compound;
B. mixing, compound and 1560g polypropylene are joined in high speed milling device, carries out mixing at 170 DEG C of temperature, obtain mixing materials;
C. granulation, after mixing materials being pulverized, to send in tablets press extruding pelletization at 210 DEG C of temperature, obtains pellet;
D. shaping, clamp-on in forming mould by pellet after plasticizing, then 190 DEG C, compression moulding under 10Mpa condition, after naturally cooling to room temperature, the demoulding obtains heat-resisting composite shielding material block.
Embodiment 5:
The heat-resisting composite shielding material block obtained in embodiment 1 ~ 4 is processed into the sheet material of 1 cm thick.
By lead-boron polythene PB202 (containing norbide 1%, leaded 80%, polyethylene 19%, density 3.6g/cm
3) be processed into the sheet material of 1 cm thick, as a comparison case.
Carry out neutron shield performance test to above-mentioned sheet material, method is as follows:
Will
241am-Be puts in source the paraffin tank with paraffin collimator, neutron beam is made to shine directly on neutron dosimeter, then sheet material is put in the centre of source and dosemeter, numeration before and after record dosemeter, tranmittance is obtained, shielding material pair divided by numeration when not having shielding material with numeration when having shielding material
241the shielding rate of Am-Be source neutron bundle is: 1-tranmittance.
Carry out gamma ray shielding performance test to above-mentioned sheet material, method is as follows:
With pig and collimator
137cs source is placed on bracket for experiment, beam,gamma-ray is made directly to be mapped on PTW general purpose dosimeter, then shielding material is put to intercept gamma-rays in the centre of source and dosemeter, numeration before and after record dosemeter, obtain tranmittance with numeration when having shielding material divided by numeration when not having shielding material, then convert shielding material pair to by formula
137the gamma-ray reduction coefficient of Cs:
H: use the dosage after shielding material
H
0: use the dosage before shielding material
T: shielding material thickness cm
μ: the line attenuation coefficient cm of shielding material
-1.
Resistance to elevated temperatures test is carried out to above-mentioned materials.The heat-drawn wire of above-mentioned materials is measured by the mensuration standard of materials of GB/T1634.2-2004 plastics load deformation temperature.
Experimental result is as shown in table 1.
Table 1
| ? | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Comparative example |
| Neutron shield rate | 23.3% | 22.9% | 23.3% | 23.2% | 23% |
| Gamma-rays reduction coefficient | 0.394cm -1 | 0.451cm -1 | 0.381cm -1 | 0.419cm -1 | 0.37cm -1 |
| Heat-drawn wire | 115℃ | 117℃ | 120℃ | 115℃ | 82℃ |
As can be seen from Table 1, heat-resisting composite shielding material disclosed by the invention, its neutron shielding rate and traditional lead-boron polythene basically identical, and gamma-rays reduction coefficient significantly improves, and heat-drawn wire significantly rises.
, can also find, the heat-resisting composite shielding material that the proportioning during embodiment 3 adopts obtains, having the highest heat-drawn wire, is a kind of preferred version in order to obtain best resistance to elevated temperatures meanwhile.
In addition, if those skilled in the art clearly it is seen that the lead oxide powder in embodiment 3 is replaced to lead powder, can obtain better gamma ray shielding performance.
Those skilled in the art will appreciate that, many changes and the structure that selectively can apply multiple exemplary embodiment description above further form other possible embodiment of the present invention.Consider the ability of those skilled in the art, do not provide in detail herein or describe the content likely repeated, but otherwise comprised all combinations and possibility embodiment be a application's part.
Claims (9)
1. a heat-resisting composite shielding material, is characterized in that: be made up of the lead powder of the polypropylene of 13.5% ~ 17.7% parts by weight, the boron carbide powder of 1% ~ 2% parts by weight, the silane coupling agent of 0.3% ~ 0.5% parts by weight and 81% ~ 84% parts by weight or lead oxide powder.
2. according to claim 1, a kind of heat-resisting composite shielding material, is characterized in that: the particle diameter of described boron carbide powder, lead powder and lead oxide powder is 50-150 micron.
3. the heat-resisting composite shielding material of one according to claim 1, is characterized in that: polyacrylic parts by weight are 17.5%, and the parts by weight of norbide are 1%, and the parts by weight of silane coupling agent are 0.5%, and the parts by weight of lead powder are 81%.
4. a preparation method for heat-resisting composite shielding material, is characterized in that, comprises the following steps:
A. batch mixing, by lead powder or lead oxide powder, boron carbide powder, silane coupling agent joins in mixer and mixes, and obtains compound;
B. mixing, compound and polypropylene are joined and carries out mixing in high speed milling device, obtain mixing materials;
C. granulation, after mixing materials being pulverized, sends into extruding pelletization in tablets press, obtains pellet;
D. shaping, clamp-on in forming mould by pellet after plasticizing, then compression moulding, after naturally cooling to room temperature, the demoulding obtains heat-resisting composite shielding material block.
5. the preparation method of a kind of heat-resisting composite shielding material according to claim 4, it is characterized in that: the parts by weight of lead powder or lead oxide powder are 81% ~ 84%, the parts by weight of boron carbide powder are 1% ~ 2%, the parts by weight of silane coupling agent are 0.3% ~ 0.5%, and polyacrylic parts by weight are 13.5% ~ 17.7%.
6. the preparation method of a kind of heat-resisting composite shielding material according to claim 5, it is characterized in that: polyacrylic parts by weight are 17.5%, the parts by weight of norbide are 1%, the parts by weight of silane coupling agent are 0.5%, and the parts by weight of lead powder are 81%.
7. according to the preparation method of a kind of heat-resisting composite shielding material in claim 4 ~ 6 described in any one, it is characterized in that: in described step B, melting temperature is 160 DEG C ~ 170 DEG C.
8. according to the preparation method of a kind of heat-resisting composite shielding material in claim 4 ~ 6 described in any one, it is characterized in that: in described step C, under 200 DEG C ~ 210 DEG C conditions, carry out extruding pelletization.
9. according to the preparation method of a kind of heat-resisting composite shielding material in claim 4 ~ 6 described in any one, it is characterized in that: in described step D, 180 DEG C ~ 190 DEG C, be pressed under 5Mpa ~ 10MPa condition.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106280461A (en) * | 2016-09-13 | 2017-01-04 | 北京市射线应用研究中心 | A kind of high temperature resistant neutron and gamma ray shielding composite and preparation method thereof |
| CN109003692A (en) * | 2018-08-01 | 2018-12-14 | 宋广山 | A kind of radiation medium shielding material and its preparation method and application |
| CN110003565A (en) * | 2019-01-24 | 2019-07-12 | 黄婷静 | A kind of radiation-proof flexible chemical industry fibre resin and preparation method thereof |
| CN111933322A (en) * | 2020-08-13 | 2020-11-13 | 中国核动力研究设计院 | High-temperature-resistant neutron shielding assembly and preparation method thereof |
| CN112552600A (en) * | 2021-02-23 | 2021-03-26 | 中广核高新核材科技（苏州）有限公司 | Neutron shielding material for rotational molding and rotational molding product with neutron shielding effect |
| CN112908505A (en) * | 2021-02-22 | 2021-06-04 | 中国核动力研究设计院 | High-temperature-resistant organic shielding material |
| CN115232385A (en) * | 2022-08-26 | 2022-10-25 | 北京富迪创业科技有限公司 | High-filling shielding material and preparation method thereof |
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| JPH0244295A (en) * | 1988-08-04 | 1990-02-14 | Nkk Corp | Neutron shielding material |
| CN1157461A (en) * | 1996-12-30 | 1997-08-20 | 天津纺织工学院 | Wide-temp. neutron and gamma ray shielding material |
| CN1763128A (en) * | 2004-10-21 | 2006-04-26 | 中国核动力研究设计院 | Machining method of lead boron polyethylene shielding material block |
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| JPH0244295A (en) * | 1988-08-04 | 1990-02-14 | Nkk Corp | Neutron shielding material |
| CN1157461A (en) * | 1996-12-30 | 1997-08-20 | 天津纺织工学院 | Wide-temp. neutron and gamma ray shielding material |
| CN1763128A (en) * | 2004-10-21 | 2006-04-26 | 中国核动力研究设计院 | Machining method of lead boron polyethylene shielding material block |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106280461A (en) * | 2016-09-13 | 2017-01-04 | 北京市射线应用研究中心 | A kind of high temperature resistant neutron and gamma ray shielding composite and preparation method thereof |
| CN109003692A (en) * | 2018-08-01 | 2018-12-14 | 宋广山 | A kind of radiation medium shielding material and its preparation method and application |
| CN110003565A (en) * | 2019-01-24 | 2019-07-12 | 黄婷静 | A kind of radiation-proof flexible chemical industry fibre resin and preparation method thereof |
| CN111933322A (en) * | 2020-08-13 | 2020-11-13 | 中国核动力研究设计院 | High-temperature-resistant neutron shielding assembly and preparation method thereof |
| CN112908505A (en) * | 2021-02-22 | 2021-06-04 | 中国核动力研究设计院 | High-temperature-resistant organic shielding material |
| CN112552600A (en) * | 2021-02-23 | 2021-03-26 | 中广核高新核材科技（苏州）有限公司 | Neutron shielding material for rotational molding and rotational molding product with neutron shielding effect |
| CN112552600B (en) * | 2021-02-23 | 2021-05-04 | 中广核高新核材科技（苏州）有限公司 | Neutron shielding material for rotational molding and rotational molding product with neutron shielding effect |
| CN115232385A (en) * | 2022-08-26 | 2022-10-25 | 北京富迪创业科技有限公司 | High-filling shielding material and preparation method thereof |
| CN115232385B (en) * | 2022-08-26 | 2024-03-26 | 北京富迪创业科技有限公司 | High-filling shielding material and preparation method thereof |
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Application publication date: 20150121 |