KR20150143052A

KR20150143052A - Radiation Shielding Sheet including Electromagnetic waves using High Density Metal powder and the Shielding Clothing thereof

Info

Publication number: KR20150143052A
Application number: KR1020140072008A
Authority: KR
Inventors: 강달훈; 강우석
Original assignee: 강달훈; 강우석
Priority date: 2014-06-13
Filing date: 2014-06-13
Publication date: 2015-12-23

Abstract

The present invention relates to a radiation shielding sheet containing electromagnetic wave using high-density metal powder and a shielding cloth made of the same, comprising: a metal powder; And a polymer compound which is mixed with the metal powder to maintain the binding force of the metal powder, and is molded into a sheet shape to shield radiation including electromagnetic waves having flexibility and stability.
The present invention provides a radiation shielding sheet comprising a radiation shielding sheet which is flexible, can be manufactured and produced efficiently, easily and conveniently with stability, attenuates electromagnetic waves in a high frequency and low frequency range and can shield radiation, Can be provided.

Description

TECHNICAL FIELD [0001] The present invention relates to a radiation shielding sheet containing electromagnetic waves using a high-density metal powder, and a shielding sheet made of the same,

The present invention relates to a radiation shielding sheet containing electromagnetic waves using high-density metal powder and a shielding cloth made therefrom, and more particularly to a radiation shielding sheet containing electromagnetic waves using a high-density metal powder capable of improving the quality and economy, A radiation shielding sheet and a shielding cloth made of the same.

Elements such as uranium and plutonium, which have very high atomic mass, are so unstable that they collapse themselves because their nuclei are too heavy. When these elements collapse and turn into other elements, they emit some particles or electromagnetic waves, which is radiation. The element that emits radiation is called a radiation element, and the ability to emit such radiation is called radiation. When these elements collapse, the radiation comes in three lines: alpha (alpha), beta (beta), and gamma (gamma). However, in general, when referring to radiation, it is common to mention not only these three, but also other particles such as X-rays and neutron rays or electromagnetic waves. Radiation can be broadly classified into two types: particles (particles), particles that move like α (alpha) rays, β (beta) rays and neutron rays, and electromagnetic waves such as X rays and γ rays. Hereinafter, a representative gamma (gamma) line and a neutron beam will be described.

The γ (gamma) line is an electromagnetic wave with a very short wavelength, that is, an electromagnetic wave whose wavelength is less than 10 pm is mostly called a gamma ray. X-rays and wavelength regions overlap and have similar properties, and X-rays and gamma rays are not distinguished by the wavelength length, but distinguish between what causes them. Gamma rays refer to the electromagnetic waves emitted when the atomic nuclei of one element collapses into other elements, and the electromagnetic waves emitted by electrons in the atom other than the atomic nucleus are called X-rays. When the nuclei inside the atom collapse and alpha rays or beta rays are emitted, very little mass is reduced, and this mass is converted into a large energy according to the Einstein equation E = mc2. This energy makes the nucleus unstable, and thus the unstable nucleus returns to a stable state and emits a large energy electromagnetic wave.

The larger the energy, the shorter the wavelength of the electromagnetic wave, so that gamma rays are emitted when the nucleus collapses. Gamma rays do not have ionization ability in themselves, but they are very large in energy, so they touch the atoms or molecules of matter and give energy and cause ionization. This is a phenomenon such as photoelectric effect or compton effect. It also produces electrons and positrons as they die (pair generation). Conversely, when an electron and a positron meet, a gamma ray appears (pair extinguishment). The ionization capacity itself is weaker than the alpha or beta radiation, but the permeability is very strong and the typical radiation exposure is due to gamma radiation. It is possible to block through dense materials such as concrete, iron, and lead, but it requires a thickness of 10 cm or more even if it is used with the most shielding lead.

Representative examples of particle beams include neutron rays, proton rays, and cosmic rays. Among electromagnetic waves, ultraviolet rays (ultraviolet rays) also cause ionization, but ultraviolet rays are generally not put into radiation. An X-ray is an electromagnetic wave having a wavelength of 0.1 × 10 8 to 50 × 10 8 cm, which is generally longer than a gamma ray and has a weak energy. Proton and neutron beams do not occur when the nucleus collapses, but by artificial means such as reactors and particle accelerators. Proton rays have similar properties to alpha rays. Neutron rays do not have electric charge but because of their kinetic energy, they lose their kinetic energy and emit gamma rays or emit protons to cause ionization. Cosmic rays refer to all radiations originating from the universe, not from Earth, such as atomic nuclei or nuclear reactors, including muons, neutrinos, electrons, neutrons, and gamma rays.

Such radiation may occur in nuclear power plants, research centers, hospitals, etc., which mainly deal with radiation in real life. Radiation shielding clothes or radiation absorbing clothes using materials which can safely shield or absorb radiation contamination of workers working under the conditions of such radiation are used. However, such shielding or absorbing garments are not restored to their original shape after being bent or bent, which is inconvenient for the user to use. In addition, it is a reality that a radiation absorbing garment capable of absorbing and shielding radiation such as neutrons is rarely developed. Accordingly, the present applicant has disclosed related arts in Japanese Patent Application Laid-Open Nos. 10-2011-133227, 10-2011-133226, and 10-2011-133225. Therefore, detailed description of the same contents as those of the applicant in the present invention will be omitted.

However, it is more preferable that such a shielding cloth is capable of shielding or absorbing radiation and / or electromagnetic waves having flexibility and stability with economical efficiency while shielding or absorbing electromagnetic waves more effectively.

SUMMARY OF THE INVENTION An object of the present invention is to provide a radiation shielding sheet including a practical electromagnetic wave, which is flexible, resilient, efficient, simple and convenient to manufacture and produce, and a shielding cloth made therefrom.

Another object of the present invention is to provide a radiation shielding sheet including electromagnetic waves capable of attenuating electromagnetic waves in a high-frequency and low-frequency range and shielding the radiation, and a shielding cloth made therefrom.

Still another object of the present invention is to provide a method for manufacturing a metal powder which can provide a strong adhesive force and a strong binding force of a raw material including a metal powder by using a polyurethane adhesive, , A radiation shielding sheet containing electromagnetic waves capable of replacing a high-density rolled cast metal plate, and a shielding cloth made of the same.

SUMMARY OF THE INVENTION And a polymer compound that is mixed with the metal powder to retain the binding force of the metal powder and is formed into a sheet shape to shield radiation including electromagnetic waves having flexibility and stability.

The metal powder may be selected from the group consisting of copper, nickel, and lead, and the polymer compound may include a polyurethane adhesive, the metal powder may be 70 to 85 wt%, the polyurethane adhesive may be 8 to 13 wt% It is preferable to shield the electromagnetic wave.

The metal powder includes a mixture of lead and tungsten, and a powder of lead and tungsten. The polymer compound includes a polyurethane adhesive. The metal powder contains 88 to 94 wt%, the polyurethane adhesive contains 4 to 6 wt% It is desirable to feature gamma ray shielding, including range.

Wherein the metal powder comprises boron carbide and the polymer compound comprises a polyurethane adhesive, wherein the metal powder comprises 65-77 wt% of the polyurethane adhesive and 10-15 wt% of the polyurethane adhesive desirable.

In addition, the size of the metal powder preferably ranges from 70 to 180 mu m.

In addition, it is preferable that the polyurethane adhesive includes a liquid adhesive.

The polyurethane adhesive preferably has a solid content of 65 ± 5 wt%, a viscosity of 3000 ± 500 cps, and a heat resistance of 220 ° C. or more.

It is also preferable that the metal powder and the polymer compound are mixed and molded at room temperature and cured at room temperature.

It is also an object of the present invention to provide a method for producing a metal powder, wherein the metal powder comprises a powder of lead or tungsten and a mixture of lead and tungsten, the polymer compound comprises a polyurethane adhesive, the metal powder contains 88 to 94 wt% (A) an electromagnetic and radiation shielding sheet (a) having a primary thickness characterized by gamma ray shielding, wherein the adhesive comprises in the range of 4 to 6 wt%, and wherein the metal powder comprises boron carbide, the polymer compound comprises a polyurethane adhesive (B) having a secondary thickness characterized by neutron absorption, wherein the metal powder comprises 65 to 77 wt% and the polyurethane adhesive comprises 10 to 15 wt% (A) is molded in a primary mold having a thickness of the primary thickness to a primary thickness, and the primary thickness and the secondary thickness (A) is accommodated in a secondary mold having an integrated thickness and then a mixture for molding the (b) is filled on the upper side of the (a) accommodated in the secondary mold and molded and cured, Are combined with each other so as not to be separated from each other.

Also, an object of the present invention is to provide a method for manufacturing a semiconductor device, comprising: a metal powder; And a polymer compound that is mixed with the metal powder to maintain the binding force of the metal powder, and is formed into a sheet shape, and has electromagnetic radiation having flexibility and stability.

The metal powder may be at least one selected from the group consisting of Au, Ag, Pt, Cu, Ni, W, Pb, Mo, ), Iridium (Ir), palladium (Pd), and thallium (T).

On the other hand, the object of the present invention is also achieved by a shielding sheet made of a radiation shielding sheet containing electromagnetic waves.

According to the present invention, there is provided a radiation shielding sheet comprising: a radiation shielding sheet including an electromagnetic wave capable of attenuating electromagnetic waves in a high frequency region and a low frequency region and shielding the radiation, And a shielding cloth made of the same.

Further, by using a polyurethane adhesive, it is possible to provide a radiation shielding sheet containing electromagnetic waves which can provide strong bonding force and strong binding force of a raw material including a metal powder, It is possible to provide a shield made of this.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a graph showing test data and graphs of a shielding sheet for shielding electromagnetic waves according to an embodiment of the present invention;
2 is a graph showing test data and graphs of a shielding sheet shielding electromagnetic waves according to another embodiment of the present invention,
3 is a graph showing test data and graphs of a shielding sheet for shielding electromagnetic waves according to another embodiment of the present invention,
FIG. 4 is a graph showing test data of a shielding sheet for shielding gamma radiation according to another embodiment of the present invention,
FIG. 5 is a graph showing test data of a shielding sheet for shielding neutron radiation according to another embodiment of the present invention,
6 is a test data of a shielding sheet for shielding gamma radiation and neutron radiation according to another embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. &Quot; and / or "include each and every combination of one or more of the mentioned items. &Lt; RTI ID = 0.0 >

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. The terms " comprises "and / or" comprising "used in the specification do not exclude the presence or addition of one or more other elements in addition to the stated element.

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. Also, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise.

The terms spatially relative, "below", "beneath", "lower", "above", "upper" And can be used to easily describe a correlation between an element and other elements. Spatially relative terms should be understood in terms of the directions shown in the drawings, including the different directions of components at the time of use or operation. For example, when inverting an element shown in the figures, an element described as "below" or "beneath" of another element may be placed "above" another element . Thus, the exemplary term "below" can include both downward and upward directions. The components can also be oriented in different directions, so that spatially relative terms can be interpreted according to orientation.

A radiation shielding sheet including electromagnetic waves using high-density metal powder according to one embodiment of the present invention and a shielding sheet (hereinafter referred to as a shielding sheet) will be described in detail with reference to FIGS. 1 to 6 As follows.

FIG. 1 is a graph showing test data and a graph of a shielding sheet for shielding electromagnetic waves according to an embodiment of the present invention, FIG. 2 is a graph and graph of test data of a shielding sheet shielding electromagnetic waves according to another embodiment of the present invention, FIG. 4 is a test data of a shielding sheet for shielding gamma radiation according to another embodiment of the present invention, and FIG. 5 is a graph showing the test data of the shielding sheet for shielding electromagnetic waves according to another embodiment of the present invention. FIG. 6 is a test data of a shielding sheet for shielding gamma radiation and neutron radiation according to another embodiment of the present invention. FIG. 6 shows test data of a shielding sheet for shielding neutron radiation according to another embodiment of the present invention.

The manufacturing process of the shielding sheet according to the present invention can be referred to the disclosure of the applicant of the present invention mentioned in the prior art and therefore the detailed drawings are not disclosed and the inventors of the present invention invented more specifically through R & Will be described.

The shielding sheet according to an embodiment of the present invention includes a metal powder and a polymer compound which is mixed with the metal powder to bind metal powder together.

The metal powder is a metal having a high density and may be a metal having a high density such as Au, Ag, Pt, Cu, Ni, T, Pb, Mo, Fe), iridium (Ir), palladium (Pd), thallium (T) and boron carbide (B4C).

In addition to the metal powder and the polymer compound, the shielding sheet may further contain an appropriate amount of an additive including a solvent, a plasticizer and a defoaming agent. Such an additive is suitably added for improving workability, workability and physical properties of the product according to the present invention desirable.

&Lt; Embodiment 1 >

The shielding sheet according to the first embodiment was composed of 30wt% of copper powder having an average particle size of 110 占 퐉, 22.5wt% of nickel powder, 22.5wt% of lead powder and 10wt% of polyurethane adhesive as an electromagnetic shielding sheet, 7% by weight of ethyl acetate and 8% by weight of additives are mixed in a mixer and mixed at a low speed for about 20 minutes.

The mixed mixture is poured into a mold having a thickness of 2 mm and molded at room temperature while keeping the thickness constant. After about 12 hours at room temperature, it is cured naturally to form a shielding sheet having a thickness of 2 mm.

FIG. 1 shows the results and graphs of the performance of a shielding sheet capable of shielding electromagnetic waves of 2 mm in thickness. The equipment used in the test of FIG. 1 is shown in Table 1 below.

Here, in the radiation shielding sheet capable of shielding the electromagnetic wave according to the first embodiment, it is preferable that the radiation shielding sheet is selected or mixed with powder selected from copper, nickel, lead, iron and tungsten, and the content of the selected powder is 70 to 85 wt %, And the polyurethane adhesive content as the polymer adhesive is preferably in the range of 8 to 13 wt%. If the content of the powder is less than this range, the fluidity or moldability is easy, but the shielding effect is deteriorated. If the powder content is higher than this range, the fluidity and moldability are very low and work is difficult. That is, the moldability is low and the binding force of the metal powder is weak, so that it is difficult to achieve the object of the product according to the present invention due to a decrease in flexibility such as cracking and cracking.

Here, the polymer compound to be used is a polyurethane adhesive, and the same applies to the polymer compounds used in the following examples.

Polyisocynate Adhesives may be prepared from a polyisocyanate and a polyol in the form of a polymer having an -NCO group at the end thereof, a polymer having a -OH group at the end of the isocyanate, a polyisocyanate or a polyester, The production method differs depending on the physical properties.

The polyurethane adhesive is classified into a two-component type in which an adhesive is cured using a separate curing agent and a one-component type in which it is cured by moisture in the air without a curing agent. However, the polyurethane adhesive according to the present invention is more preferably one-component type in consideration of physical properties, workability, productivity, and the like of the product.

On the other hand, the polyurethane adhesive according to the present invention has been tested for a long time by various methods by various methods of the present inventors. As a result, the solid content is preferably in the range of 65 ± 5 wt%, and when the solid content is low, And the strength, flexibility and workability of the final product are deteriorated when the solid content is high.

For the fluidity and processability (moldability) of the polyurethane adhesive, it is preferable to select a viscosity of 3000 占 500 cps or more and a heat resistance of 220 占 폚 or more.

On the other hand, the polymer compound in the present invention preferably includes an adhesive in a liquid state, and the adhesive in the liquid state may include an adhesive containing a solvent such as an epoxy adhesive, a rubber adhesive, and a silicone adhesive.

The present invention can substitute for a high-density metal sheet produced in the form of a rolled casting. Among the properties of the polymer compound when the high-density metal powder used as the shielding material is mixed with the polymer compound, the fluidity or moldability plays a very important role in determining a series of operations and quality. That is, it can be compounded with the polymeric compound to the maximum extent. In consideration of the binding force of the compounded metal powder, physical properties of the final product, hardness, flexibility and the like, the one-component adhesive is most preferable among the polyurethane adhesives described above. The inventor was able to derive through a number of experiments.

The polymer compound used and used in the prior art for mixing and dispersing a metal powder and a polymer compound or a polymer base is a polyvinyl alcohol resin (PVA). Polyethylene resin (PE), including high density polyethylene resin (HDPE), low density polyethylene resin (LDPE), epoxy resin, synthetic rubber, natural rubber, silicone rubber, fluorinated rubber, PVC resin, acrylic resin, urethane resin And / or thermosetting polymeric compounds. Since such a polymer compound is not a liquid state adhesive having fluidity or flow but a solid solvent-free particle resin form, fluidity or flowability of the resin is essential for mixing or dispersing metal powder. Therefore, another solvent is used, Physical or chemical means such as pressurization equipment, solidification, hardening, and facilities are indispensably required.

On the other hand, since the liquid polyurethane resin according to the present invention is not a conventional solid polymer compound, it is very suitable as compared with the polymer compound of the prior art to be formed into a uniform thickness as in the present invention, . In addition, due to such a liquid polyurethane adhesive, it is possible to stably formulate and disperse the metal powder to a maximum content for flexibility and effective shielding, which are essential in the present invention, to improve the binding force of the metal powder, Pinholes, and the like can be prevented. Therefore, productivity, economy, reliability and quality of products can be improved compared to the prior art.

In addition, the size of the metal powder used in the present invention and the present embodiment preferably has an average particle size in the range of 70 to 180 mu m. That is, in the case of a nano-sized metal powder having a small metal powder size, the process of making a radiation shielding material using nano-metal powder is very complicated as disclosed in Korean Patent Publication No. 10-2010-47510, There is a high possibility that pores will occur depending on the friction surface, which is disadvantageous in flexibility and hardness of the product, and is also disadvantageous in the binding force of the metal powder.

Here, the inventors found that the mixing ratio of the polymer compound varies depending on the size of the metal powder, and the physical properties including the shielding ratio of the shielding sheet as the final product are different from each other in many tests.

&Lt; Embodiment 2 >

In the shielding sheet according to the second embodiment, the electromagnetic shielding sheet was composed of 37.5 wt% of copper powder having an average particle size of 110 μm, 23 wt% of nickel powder, 15 wt% of tungsten powder and 9.4 wt% of polyurethane adhesive, 6.6 wt% of ethyl acetate and 8.5 wt% of an additive were blended in a mixer, and the remaining steps were the same as in the first embodiment.

FIG. 2 shows the results and graphs of the performance of the shielding sheet capable of shielding electromagnetic waves of 2 mm in thickness, and the test equipment is the same as in Table 1.

&Lt; Third Embodiment >

The shielding sheet according to the third embodiment is an electromagnetic shielding sheet comprising 41.7 wt% of copper powder having an average particle size of 110 μm, 27.8 wt% of nickel powder, 12.6 wt% of polyurethane adhesive, ethyl acetate (ethyl acetate) Ethyl acetate) and 10 wt% of an additive were blended with a mixer, and the remaining steps were the same as those of the first embodiment described above.

FIG. 3 shows the results and graphs of the performance of the shielding sheet capable of shielding electromagnetic waves of 2 mm in thickness, and the test equipment is the same as in Table 1.

The shielding sheet according to the fourth example was a shielding sheet for shielding gamma radiation, which contained 90 wt% of lead powder having an average particle size of 110 μm, 4.6 wt% of polyurethane adhesive, 2 wt% of ethyl acetate (ethyl acetate) % And 3.4 wt% of the additive were blended with a mixer and poured into a mold having a thickness of 5 mm, and the remaining steps were the same as in the first embodiment.

FIG. 4 shows a result of testing the performance of a shielding sheet capable of shielding gamma radiation of 5 mm in thickness. The measurement equipment was Model 6112M / H as a high - level beta - gamma dose rate meter. In FIG. 4, the upper table is a report table for lead powder, and the lower table of FIG. 4 is a report table for tungsten powder.

Here, in the radiation shielding sheet capable of shielding the gamma radiation according to the fourth embodiment, the content of the lead powder or the tungsten powder and the lead powder and the tungsten powder is in the range of 88 to 94 wt%, and the content of the polyurethane adhesive as the polymer adhesive is It is preferably in the range of 4 to 6 wt%. If the content of lead and / or tungsten powder is lower than this range, the flowability and moldability are easy, but the shielding effect is lowered. If the content is higher than this range, the fluidity and formability are very poor and cracking, cracking, Because it does not meet the purpose of the product in terms of strength, density and flexibility.

The shielding sheet according to the fifth embodiment is a shielding sheet capable of absorbing neutron radiation, which is composed of 74.9 wt% of boron carbide powder having an average particle size of 110 mu m, 13.2 wt% of polyurethane adhesive, ethyl acetate , Ethyl acetate) and 5.9 wt% of an additive were blended in a mixer, and the mixture was poured into a mold having a thickness of 2 mm, and the remaining steps were the same as in the first embodiment.

FIG. 5 shows the results of testing the shielding sheet capable of absorbing the neutron radiation of 2 mm in thickness.

Here, the neutron beam is absorbed in the shielding sheet of the present embodiment, is extinct, and is shielded from passing through the human body.

In the radiation shielding sheet capable of absorbing the neutrons by absorbing the neutrons according to the fifth embodiment, the content of the boron carbide is preferably in the range of 65 to 77 wt%, and the content of the polyurethane adhesive as the polymer adhesive is preferably in the range of 10 to 15 wt% . If the boron content is lower than this range, the fluidity is good, but the workability is good. However, the neutron shielding rate is low due to the low boron content. If the boron content is higher than this range, the boron carbide excessively binds to lower the binding force and breaks or cracks It has been found from many experiments that flexibility is also different from the object of the present invention.

Boron (B) is a high-melting-point earthy mineral with a Mohs hardness of 9.3 and a high melting point of 2,200 ° C. In order to produce boron in the form of a sheet in the form of a metal plate, It is highly desirable to prepare a flexible neutron shielding sheet by blending the powder with a polyurethane adhesive which is a polymer compound.

Boron carbide (B4C) is a boron compound which is the most abundant of boron contents as it is originally because boron is heated and reduced at 2,400 ℃ or higher. It is a metal which has excellent absorption capacity of radiation neutrons in boron characteristics. The neutrons in the radiation have characteristics that they are absorbed in the shielding sheet as in the present invention because they are not flow straight, unlike gamma, and are fluid radiation having energy. On the other hand, in the conventional technology, a neutron shielding sheet is produced by mixing boron oxide (B2O3), which is boron oxide, with high-density polyethylene, but boron oxide (B2O3) has a lower boron content than boron carbide (B4C) . At present, nuclear power plants are using paraffin blocks, concrete, and water for neutron shielding.

The sixth embodiment is a combination of a shielding sheet for shielding gamma radiation of 3 mm thickness instead of 5 mm of the fourth embodiment and a shielding sheet capable of absorbing 2 mm neutron radiation of the fifth embodiment.

That is, first, a shielding sheet formed of a 3 mm mold as in the fourth embodiment was attached to a mold having a combined thickness of 3 mm + 2 mm = 5 mm before the two shielding sheets were completely hardened (before curing) And then the mixture for the shielding sheet of the fifth embodiment is poured by the remaining excess thickness in the mold to form a multi-purpose application (hereinafter referred to as " Gamma ray shielding and neutron beam absorption) shielding sheet can be molded.

FIG. 6 shows the results of testing the performance of a shielding sheet capable of shielding neutron radiation and gamma radiation according to the present embodiment. Here, the gamma dose rate is 0.40 mSv / h and the neutron dose rate is 2.10 mS / h.

With this molding method, two sheets of the shielding sheet can be formed into one without using a separate adhesive when the two sheets are joined together, so that the joined regions are not artificially separated and bonded very firmly as one shielding sheet .

It is needless to say that in the above-described embodiment, it is possible to pressurize the respective shielding sheets in order to make the thickness constant during the molding process.

Table 2 shows these examples.

The thickness of the shielding sheet is in the range of 1 to 5 mm for shielding sheet for shielding electromagnetic waves, 3 to 10 mm for shielding sheet for shielding gamma radiation, 2 to 5 mm for shielding sheet for shielding neutron radiation, The thickness of the shielding sheet which can be used is preferably in the range of 5 to 10 mm in consideration of the flexibility, the weight at the time of making the shielding cloth to be worn by the user, shielding efficiency, economical efficiency, etc. However, Of course.

In addition, depending on the dose of harmful electromagnetic waves and radiation, the selection of the metal powder can be variously adjusted and adjusted depending on the use, as well as the weight, thickness, shielding rate, and the like of the shielding sheet. Shielding suit to help. Protective clothing or the like, and may be applied to a protective film or the like as necessary.

In addition, since it is possible to manufacture the one-piece type sheet by pouring into a mold having a desired shape at the time of manufacturing, there is no joint or joint, thereby improving the shielding efficiency and providing stability to the user and improving reliability.

According to the present invention, there is provided a radiation shielding sheet comprising electromagnetic waves capable of attenuating electromagnetic waves and shielding radiation in a high frequency region and a low frequency region, which can be manufactured and produced efficiently, easily, It is possible to provide a shield made of this.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the invention. will be. The scope of the invention will be determined by the appended claims and their equivalents.

Claims

A metal powder;
And a polymer compound that is mixed with the metal powder to maintain a binding force of the metal powder, and is formed into a sheet shape, and is capable of shielding radiation including electromagnetic waves having flexibility and stability.

The method of claim 1, wherein
Wherein the metal powder is selected or mixed with the group consisting of copper, nickel, and lead, and the polymer compound includes a polyurethane adhesive,
Wherein the metal powder contains 70 to 85 wt% of the polyurethane adhesive, and 8 to 13 wt% of the polyurethane adhesive covers the electromagnetic wave.

The method according to claim 1,
Wherein the metal powder comprises a powder of lead or tungsten and a mixture of lead and tungsten, the polymer compound comprising a polyurethane adhesive,
Wherein said metal powder comprises 88 to 94 wt% of said polyurethane adhesive, and said polyurethane adhesive comprises 4 to 6 wt% of said electromagnetic powder.

The method according to claim 1,
Wherein the metal powder comprises boron carbide, the polymer compound comprises a polyurethane adhesive,
Wherein the metal powder contains 65 to 77 wt% of the polyurethane adhesive, and 10 to 15 wt% of the polyurethane adhesive absorbs the neutron to thereby shield the radiation shielding sheet.

5. The method according to any one of claims 2 to 4,
Wherein the size of the metal powder is in the range of 70 to 180 mu m.

5. The method according to any one of claims 2 to 4,
Characterized in that the polyurethane adhesive comprises a liquid adhesive.

The method according to claim 6,
Wherein the polyurethane adhesive includes a range of 65 ± 5 wt% of solids, a viscosity of 3000 ± 500 cps, and a heat resistance of 220 ° C. or more.

The method according to claim 1,
Wherein the metal powder and the polymer compound are mixed, molded at room temperature, and then dried and cured at room temperature.

Wherein the metal powder comprises a powder of lead or tungsten and a mixture of lead and tungsten, the polymer compound comprises a polyurethane adhesive, wherein the metal powder is in the range of 88 to 94 wt% and the polyurethane adhesive in the range of 4 to 6 wt% (A) having a primary thickness characterized by gamma ray shielding, including
Characterized in that the metal powder comprises boron carbide and the polymeric compound comprises a polyurethane adhesive, wherein the metal powder comprises 65-77 wt% and the polyurethane adhesive comprises 10-15 wt% And a coupling portion for coupling the electromagnetic wave having the thickness and the radiation shielding sheet (b)
The coupling portion
(A) is molded into a primary mold having a primary thickness and a primary thickness,
(A) is accommodated in a secondary mold having a combined thickness of the primary thickness and the secondary thickness before the step (a) is completely cured, and the step (b) is carried on the upper side of the step (a) Wherein the molding material is filled with a mixture for molding, dried, and cured so that the (a) and the (b) are combined so as not to be separated from each other.

A metal powder;
And a polymer compound that is mixed with the metal powder and retains the binding force of the metal powder, and is formed into a sheet shape and has flexibility and stability.

11. The method of claim 10,
The metal powder may be at least one selected from the group consisting of Au, Ag, Pt, Cu, Ni, W, Pb, Mo, Wherein the radiation shielding sheet is selected from the group consisting of iridium (Ir), palladium (Pd), and thallium (T).

The method according to claim 10 or 11,
Wherein the polymer compound comprises a polyurethane adhesive.

13. The method of claim 12,
Characterized in that the polyurethane adhesive comprises a liquid adhesive.

14. The method of claim 13,
Wherein the polyurethane adhesive includes a range of 65 ± 5 wt% of solids, a viscosity of 3000 ± 500 cps, and a heat resistance of 220 ° C. or more.

A shielding cloth made of a radiation shielding sheet comprising the electromagnetic wave of any one of claims 1, 9 and 10.