JP5237510B1 - Radioactive material adsorbent, method for producing the same, and textile product including the same - Google Patents

Abstract

The radioactive substance adsorbent of the present invention is a radioactive substance adsorbent composed of a fiber material, and a metal phthalocyanine compound is supported on the fiber material. The metal phthalocyanine compound is preferably a copper phthalocyanine dye or a copper phthalocyanine pigment. The fiber material is preferably composed of cellulosic fibers and / or polyester fibers, and more preferably a nonwoven fabric composed of polyester fibers. Moreover, it is preferable that the said cellulose fiber is a rayon fiber whose primary swelling degree is 150 to 500%. The textile product of this invention contains said radioactive substance adsorbent. In the method for producing a radioactive material adsorbent according to the present invention, a fiber material is impregnated or coated with a solution containing a metal phthalocyanine compound or a dispersion containing a metal phthalocyanine compound, and the fiber material is loaded with the metal phthalocyanine compound.

Description

  The present invention relates to a radioactive material adsorbent capable of removing radioactive substances, a method for producing the same, and a textile product including the same.

  When an accident occurs at a nuclear power plant or the like, a large amount of radioactive material is released into the atmosphere, and due to the influence of rainfall or the like, it is in a state where it accumulates on the ground together with dust and dirt in the atmosphere. Among the radioactive materials, cesium 137 (cesium has 39 types of isotopes) is a medium-life fission product, which is responsible for the radioactivity generated in the area surrounding the Chernobyl nuclear power plant accident. Since cesium 137 has a long half-life of 30 years and a low neutron capture rate, it cannot be treated by neutron capture and must wait for natural decay.

  When radioactive materials such as cesium 137 and strontium 90 enter the body, they radiate beta and gamma rays to the intestines and liver through the flow of blood, accumulate in muscles by replacing potassium, and then are discharged outside the body through the kidneys. The However, since radioactive substances such as cesium 137 and strontium 90 are taken into the body and discharged out of the body, they cause beta exposure and gamma radiation and cause exposure in the body. . Therefore, the development of technology for removing radioactive substances such as cesium has become an important issue requiring urgent.

  Conventionally, porous materials such as zeolite and molecular sieve are known as materials that adsorb radioactive materials such as cesium. However, when these porous substances are fixed on the fiber together with the binder, many of the pores are blocked, resulting in a problem that the adsorbing ability is deteriorated.

  Therefore, Patent Document 1 proposes to use a cellulosic fiber carrying a ferrocyanide as a radionuclide and a heavy metal scavenger. Patent Document 2 discloses a method of recovering and removing toxic metals such as cesium dissolved in hot springs, and a polymer substrate mainly composed of polymer fibers, and graft polymerization on the polymer substrate. There has been proposed a method of passing hot spring water through a metal adsorbent having an introduced graft chain and a chelate-forming group introduced into the graft chain.

JP-A-64-33272 JP 2006-26588 A

  The present invention provides a radioactive material adsorbent as a novel fiber material for removing radioactive substances, a method for producing the same, and a textile product including the same.

  The present invention relates to a radioactive material adsorbent composed of a fiber material, and relates to a radioactive material adsorbent in which a metal phthalocyanine compound is supported on the fiber material.

  The present invention is also a method for producing a radioactive material adsorbent comprising a fiber material, wherein the fiber material is impregnated or coated with a solution containing a metal phthalocyanine compound or a dispersion containing a metal phthalocyanine compound, Further, the present invention relates to a method for producing a radioactive material adsorbent on which the metal phthalocyanine compound is supported.

Furthermore, this invention relates to the textiles containing the said radioactive substance adsorbent.

  The present invention can provide a radioactive substance adsorbent that removes radioactive substances by supporting a metal phthalocyanine compound on a fiber material. Moreover, the textiles which have radioactive substance adsorption | suction performance can be provided by including the said radioactive substance adsorbent in textiles. Preferably, the radioactive substance adsorbent of the present invention selectively adsorbs radioactive substances such as iodine, cesium, and strontium that have accumulated on the ground together with dust and dirt in the atmosphere due to the influence of rainfall, etc. Incorporation of radioactive substances such as iodine, cesium, and strontium into the human body can be prevented. Therefore, if the textile product containing the radioactive substance adsorbent of the present invention is placed in the living environment, it is possible to prevent the radioactive substance such as iodine, cesium, and strontium from being taken into the human body. Moreover, according to the production method of the present invention, the metal phthalocyanine compound can be easily supported on the fiber material.

FIG. 1 is a schematic cross-sectional view illustrating a cesium adsorption test in one embodiment of the present invention.

As a result of intensive studies on an adsorbent for radioactive substances, the present inventors have found that a compound containing a metal phthalocyanine as an active ingredient (metal phthalocyanine compound) is highly adsorbable with respect to the radioactive substance. Furthermore, by supporting a metal phthalocyanine compound on a fiber material, it has been found that it has a high adsorptivity with respect to radioactive substances, and the present invention has been achieved. The metal phthalocyanine compound has a planar structure centered on a metal ion such as a copper ion. Since the metal phthalocyanine compound has such a planar structure, stacking (a crystal structure in which the planes overlap) is easily made. A moderate space is formed between the stacked phthalocyanine planes due to steric hindrance and interaction between metal ions. Therefore, when a metal phthalocyanine compound is supported on a support such as a fiber material, it is interfered by the molecules of fibers such as cellulose and polyester, thereby creating a stack with a larger distance between layers than the case of a single metal phthalocyanine compound. It is estimated that radioactive materials such as iodine, cesium, and strontium having a relatively large ionic radius can be captured. The radioactive substance adsorbent of the present invention and the fiber product including the radioactive substance adsorbent are particularly excellent in the radioactive substance adsorbing performance when the radioactive substance is cesium. That is, the radioactive substance adsorbent of the present invention and the fiber product containing the radioactive substance adsorbent are particularly excellent in cesium adsorption performance.

(Radioactive material adsorbent)
First, the radioactive material adsorbent of the present invention will be described. The radioactive substance adsorbent is composed of a fiber material carrying a metal phthalocyanine compound. Specifically, a metal phthalocyanine compound having a high adsorptivity to a radioactive substance is supported on a fiber material, and the metal phthalocyanine compound supported on the fiber material adsorbs the radioactive substance.

  The metal phthalocyanine compound is not particularly limited. For example, a metal phthalocyanine dye or a metal phthalocyanine pigment containing a metal element such as copper, cobalt, or iron can be used. From the viewpoint of the crystal structure, a copper phthalocyanine dye or It is preferable to use a copper phthalocyanine pigment shown as an example in the following formula (1). Examples of the copper phthalocyanine dye include, for example, sodium copper phthalocyanine tetrasulfonate, copper phthalocyanine trisulfonate, copper phthalocyanine disulfonate, copper phthalocyanine monosulfonate and a mixture thereof, polyhalogenated copper phthalocyanine tetrasulfonate sodium, Sodium polyhalogenated copper phthalocyanine trisulfonate, sodium polyhalogenated copper phthalocyanine disulfonate, sodium polyhalogenated copper phthalocyanine monosulfonate, and mixtures thereof can be used. Examples of the metal phthalocyanine compound include a copper phthalocyanine dye “Reactive Blue 21” manufactured by Sumitomo Chemical Co., Ltd. represented by the following general formula (2) and a copper phthalocyanine pigment “manufactured by Dainichi Seika Kogyo Co., Ltd.” Commercial products such as “Blue FLGB Conc” can be used.

  Although it does not specifically limit as said fiber raw material, For example, the fiber raw material comprised by fibers, such as a cellulose fiber, a polyester fiber, an acrylic fiber, a nylon fiber, an olefin fiber, can be used. Especially, it is preferable that it is a fiber raw material comprised from the 1 or more types of fiber chosen from the group which consists of a cellulosic fiber and a polyester fiber from a viewpoint of workability and cost.

  The cellulose fibers are not particularly limited, and natural cellulose fibers such as cotton and hemp, regenerated cellulose fibers such as rayon, and the like can be used. Among these, rayon fibers are preferred from the viewpoint of processability and cost, and rayon fibers having a primary swelling degree of 150 to 500% (hereinafter also referred to as amorphous rayon fibers) are more preferred, and a primary swelling degree is 200 to 500. More preferred is 300% rayon fiber. In the present invention, the primary degree of swelling refers to the degree of swelling measured after the production of regenerated cellulose fibers by a wet spinning method and without passing through the drying step, and the degree of secondary swelling measured after passing through the drying step. Differentiated. Specifically, the primary swelling degree is measured according to JIS L-1015 7.25. If the primary swelling degree of the rayon fiber is 150 to 500%, the metal phthalocyanine compound can be easily supported and has sufficient strength to withstand practical use even in the fiber form.

  The form of the said fiber raw material is not specifically limited, Any forms, such as a fiber, a thread | yarn, a textile fabric, a knitted fabric, a nonwoven fabric, powder, paper, may be sufficient. The radioactive material adsorbent may be any material as long as a metal phthalocyanine compound is supported on the fiber material, and the form thereof is not particularly limited. Like the fiber material, fibers, yarns, woven fabrics, knitted fabrics, and nonwoven fabrics are used. Any form of powder, paper, etc. may be used.

  The form of the fiber is not particularly limited, and may be a long fiber or a short fiber. The form of the yarn is not particularly limited, and may be a spun yarn or a filament yarn. The form of the nonwoven fabric is not particularly limited and may be any of a thermal bond nonwoven fabric, a spunbond nonwoven fabric, a spunlace nonwoven fabric, a needle punch nonwoven fabric, a melt blown nonwoven fabric, a chemical bond nonwoven fabric, and the like. The woven fabric is not particularly limited, and may be a woven fabric having any structure such as plain weave, twill weave, satin weave, or the like. Further, the knitted fabric is not particularly limited, and may be, for example, a circular knitting, a flat knitting or a warp knitting. Examples of the form of the powder include a powder or thread that is cut or pulverized into a powder form. Examples of the form of the paper include wet papermaking of fibers cut to a fiber length of 2 to 20 mm.

  In the radioactive material adsorbent, the amount of the metal phthalocyanine dye supported is not particularly limited as long as it can exhibit an effect of adsorbing a radioactive substance such as cesium, but from the viewpoint of being more excellent in the adsorption performance of the radioactive substance. The content is preferably 0.1 to 15% by mass, more preferably 10 to 15% by mass, and still more preferably 12 to 15% by mass.

  The support of the metal phthalocyanine compound on the fiber material is not particularly limited, but from the viewpoint of facilitating the support of the metal phthalocyanine compound, the fiber material is impregnated with a solution containing the metal phthalocyanine compound or a dispersion containing the metal phthalocyanine compound. This can be done by coating. For example, when the metal phthalocyanine compound is a metal phthalocyanine dye, the fiber material can be impregnated with or coated with a solution containing the metal phthalocyanine dye, and the fiber material can carry the metal phthalocyanine compound. Specifically, it can be performed by dyeing the fiber material in a dye bath containing a metal phthalocyanine dye. The dyeing can be performed by a dip dyeing method, a printing method, or the like. Examples of the textile printing method include methods such as screen printing, gravure printing, and coating. Alternatively, when the metal phthalocyanine compound is a metal phthalocyanine pigment, the fiber material can be impregnated or coated with a pigment dispersion containing a metal phthalocyanine pigment and a binder, and the fiber material can carry the metal phthalocyanine compound. For example, a metal phthalocyanine pigment may be supported by being fixed with a binder or the like.

  When the radioactive material adsorbent is in the form of a fiber, for example, the fiber is immersed in a dye bath containing a metal phthalocyanine compound, for example, a metal phthalocyanine dye, so that the metal phthalocyanine compound is supported on the fiber to obtain the radioactive material adsorbent. be able to.

  When the radioactive material adsorbent is in the form of yarn, for example, the yarn is immersed in a dye bath containing a metal phthalocyanine compound, for example, a metal phthalocyanine dye, so that the metal phthalocyanine compound is supported on the yarn to obtain the radioactive material adsorbent. be able to. Or you may manufacture a spun yarn using the said radioactive substance adsorbent of a fiber form individually or in combination with another fiber.

  When the radioactive substance adsorbent is in powder form, the radioactive substance adsorbent in powder form can be obtained by cutting or grinding the radioactive substance adsorbent in fiber form or thread form into a powder. The fiber length of the powder is, for example, preferably 5 to 1000 μm, and more preferably 100 to 500 μm.

  When the radioactive material adsorbent is in the form of a non-woven fabric, for example, the non-woven fabric is immersed in a dye bath containing a metal phthalocyanine compound, for example, a metal phthalocyanine dye, so that the metal phthalocyanine compound is supported on the non-woven fabric, Can be obtained. Alternatively, a metal phthalocyanine compound such as a metal phthalocyanine pigment may be supported on the surface of the nonwoven fabric by fixing it with a binder or the like. Alternatively, the radioactive substance adsorbent in powder form may be fixed to the surface of the nonwoven fabric with a binder or the like. Or you may manufacture a nonwoven fabric using the radioactive substance adsorption material of the said fiber form individually or in combination with another fiber.

  When the radioactive material adsorbent is in the form of a woven fabric or a knitted fabric, for example, the woven fabric or the knitted fabric is immersed in a dye bath containing a metal phthalocyanine compound, for example, a metal phthalocyanine dye, so that the metal phthalocyanine compound is supported on the woven fabric or the knitted fabric. Thus, a radioactive material adsorbent can be obtained. Alternatively, a metal phthalocyanine compound such as a metal phthalocyanine pigment may be supported on the surface of the woven or knitted fabric by fixing it with a binder or the like. Alternatively, the radioactive material adsorbent in powder form may be fixed to the surface of the woven or knitted fabric with a binder or the like. Or you may manufacture a textile fabric or a knitted fabric using the said radioactive material adsorbent of a thread form individually or in combination with another thread | yarn.

  When the radioactive material adsorbent is in paper form, for example, by immersing the paper in a dye bath containing a metal phthalocyanine compound, for example, a metal phthalocyanine dye, the metal phthalocyanine compound is supported on the paper and the radioactive material adsorbent is used. Can be obtained. Alternatively, a metal phthalocyanine compound such as a metal phthalocyanine pigment may be supported on the paper surface by fixing it with a binder or the like. Alternatively, the radioactive material adsorbent in the form of fibers may be cut to a fiber length of 2 to 20 mm and wet papermaking.

  From the viewpoint of easily supporting (dyeing) a metal phthalocyanine dye on the fiber material, the content (concentration) of the metal phthalocyanine dye in the solution (dye bath) containing the metal phthalocyanine dye is the mass of the fiber material. It is preferable that it is 10 mass% or more with respect to it, More preferably, it is 12 mass% or more, More preferably, it is 15 mass% or more. From the viewpoint of preventing dye peeling, the content (concentration) of the metal phthalocyanine dye is preferably 50% by mass or less based on the mass of the fiber material.

  Moreover, when fixing a metal phthalocyanine pigment to a fiber material such as a nonwoven fabric with a binder or the like, screen printing, gravure printing, coating, spraying, using a pigment dispersion in which a metal phthalocyanine pigment is dispersed in water together with a binder, It can be performed by application with a brush. In the dispersion, the content (concentration) of the metal phthalocyanine pigment is preferably 0.5 to 25% by mass, more preferably 2 to 20% by mass with respect to the dispersion, The content is preferably 20 to 90% by mass, more preferably 40 to 60% by mass with respect to the dispersion.

  The binder is not particularly limited, but from the viewpoint of uniformly dispersing the metal phthalocyanine pigment, an acrylic binder, a urethane binder, and a vinyl acetate binder are preferable, and an acrylic binder is more preferable. . As the acrylic binder, for example, Matsumin Super White RBW4TMO manufactured by Matsui Dye Chemical Co., Ltd. can be used.

  In the radioactive material adsorbent, a ferrocyanide may be further supported on the fiber material. The combined use of the metal phthalocyanine compound and the ferrocyanide further improves the adsorption performance for radioactive substances such as cesium. In the radioactive material adsorbent, the ferrocyanide is not particularly limited, but iron ferrocyanide is preferable from the viewpoint of excellent adsorption performance for the radioactive substance. As the ferrocyanide, for example, bitumen can be used.

The above-mentioned ferrocyanide such as bitumen is added to a dispersion containing a metal phthalocyanine pigment and a binder, and fixed to the fiber material together with the metal phthalocyanine pigment by screen printing, gravure printing, coating, spraying, application by brush, etc. Dyeing). Alternatively, a dispersion containing a ferrocyanide such as bitumen and a binder is fixed to a fiber material such as a woven fabric, a knitted fabric, or a non-woven fabric already supporting a metal phthalocyanine compound by screen printing, gravure printing, coating, spraying, brush application, etc. The ferrocyanide may be supported by (dyeing). Alternatively, a powdered radioactive material adsorbent supporting only a metal phthalocyanine compound, a ferrocyanide such as bitumen, and a dispersion containing a binder by screen printing, gravure printing, coating, spraying, brushing, etc. The ferrocyanide may be supported by being fixed (dyed) to a fiber material such as a nonwoven fabric. In the radioactive material adsorbent, the fixed amount (dyeing) of the metal phthalocyanine pigment is preferably 0.05 to 30 g per unit area (1 m ² ), and the fixed amount (dyeing) of the ferrocyanide is preferably Is 0.05 to 10 g per unit area (1 m ² ). In the dispersion, the ferrocyanide content (concentration) is preferably 0.1 to 10% by mass, and more preferably 1 to 5% by mass with respect to the dispersion. In the dispersion, the content (concentration) of the metal phthalocyanine pigment is preferably 0.1 to 20% by mass, more preferably 0.5 to 15% by mass with respect to the dispersion, Preferably it is 1-10 mass%.

The radioactive substance adsorbent preferably has a radioactive substance adsorption rate of 30% or more, more preferably 50% or more, still more preferably 80% or more, and particularly preferably 90% or more. In particular, the radioactive material adsorbent preferably has a cesium adsorption rate of 30% or more, more preferably 50% or more, still more preferably 80% or more, and particularly preferably 90% or more. In the present invention, the cesium adsorption rate can be measured, for example, as follows. For a sheet-like sample, 4 ml of 0.05% cesium chloride aqueous solution was brought into contact with 1000 cm ^2, and after 1 hour, the concentration of cesium in the aqueous solution was changed to μ-EDX (energy dispersive micro fluorescent X-ray analyzer, Shimadzu Corporation). ). A sheet-like sample means samples, such as a nonwoven fabric, a textile fabric, and a knitted fabric. For cotton-like samples (fibers), 0.5 g of 0.05% cesium chloride aqueous solution was brought into contact with 0.5 g, and 1 hour later, the concentration of cesium in the aqueous solution was measured by μ-EDX (energy dispersive microscopic X-ray fluorescence analysis). Measured using a device manufactured by Shimadzu Corporation. For the powdered sample, 0.5 g of 0.05% cesium chloride aqueous solution is brought into contact with 0.5 g, and after 1 hour, the concentration of cesium in the aqueous solution is changed to μ-EDX (energy dispersive microscopic fluorescent X-ray analyzer, stock Measured using Shimadzu Corporation.

(Fiber products)
Next, the fiber product of the present invention will be described. The textile product of this invention contains the said radioactive substance adsorbent.

  The textile products include sanitary masks, agricultural sheets, contaminated soil sheets, flexible container bags (hereinafter sometimes referred to as “ton bags”), crop protection sheets, decontamination sheets for ponds and pools, and rainwater piping. Sheets, cartridge filters, cleaner packs, protective clothing, sandbags, civil engineering sheets, civil mats, shatterproof sheets, air conditioner (air conditioner) filters, ventilation vent filters, residential ventilation system filters, vacuum cleaner filters, humidifiers Examples include dehumidifier pre-filters, air purifier filters, air-conditioning filters used in buildings, hospitals, factories, automobile air conditioner (air conditioner) filters, water purifier filters, and the like. The said textile product exhibits the adsorption effect with respect to radioactive substances, such as cesium, by including the said radioactive substance adsorbent.

  Hereinafter, each fiber product will be described.

A case where the textile product is a sanitary mask (mask) will be described. The radioactive material adsorbent in the form of the nonwoven fabric described above is used for at least one of the filtration layers constituting the mask. In the mask, the radioactive substance adsorbent is used to prevent the radioactive substance such as cesium floating in the atmosphere or integrated with dust or dust from being taken into the human body. It is preferred to place it on the opposite outer surface. Moreover, in order to obtain a physical filtration function as a mask, it is preferable to form a filtration layer laminated with 3 to 6 layers in combination with another nonwoven fabric or the like. Although there is no limitation in particular about the radioactive material adsorption material of the said nonwoven fabric form, It is preferable that it is a spun bond nonwoven fabric. Moreover, it is preferable that the fabric weight of the said nonwoven fabric is the range of 15-30 g / m < ² >. Moreover, what was produced as mentioned above should just be used as a radioactive substance adsorbent of the said nonwoven fabric form.

The case where the textile product is an agricultural sheet and / or a contaminated soil sheet will be described. These products are, for example, applied to soil such as farmland, and adsorb radioactive substances such as cesium floating in the air or integrated with dust and dust with the agricultural sheet or contaminated soil sheet, It can be used as a sheet for preventing further soil contamination. In this case, the form of the radioactive substance adsorbent is not particularly limited, but is preferably a woven fabric or a non-woven fabric, and more preferably a non-woven fabric. In the case of a nonwoven fabric, it is preferably a spunbond nonwoven fabric or a needle punched nonwoven fabric. The basis weight of the nonwoven fabric, preferably at 15 g / ^{m 2} or more, and more preferably 15~300g / ^{m 2.} What is necessary is just to use what was produced as mentioned above as a radioactive substance adsorbent of the said nonwoven fabric form. Similarly, what was produced as mentioned above should just be used as a radioactive material adsorption material of the above-mentioned textile form. In addition, when a sheet-like net formed by irregularly intersecting a plurality of continuous filaments having a thickness of 0.1 to 10 mm is integrated on at least one surface of the radioactive material adsorbent in the form of woven fabric or nonwoven fabric, This leads to prevention of sheet scattering.

The case where the textile product is a ton bag will be described. This product is a bag for adsorbing radioactive substances that have been eluted, for example, when radioactive soil such as cesium is ionized and eluted when contaminated soil containing moisture is enclosed in a ton bag. In this case, the form of the radioactive substance adsorbent is not particularly limited, but is preferably a woven fabric or a non-woven fabric, and more preferably a non-woven fabric. When it is a non-woven fabric, it is preferably a spunbond non-woven fabric. The basis weight of the nonwoven fabric, and more preferably is preferably about 50 to 150 g / ^{m 2,} is about 100 g / ^{m 2.} What is necessary is just to use what was produced as mentioned above as a radioactive substance adsorbent of the said nonwoven fabric form. Similarly, what was produced as mentioned above should just be used as a radioactive material adsorption material of the above-mentioned textile form. In addition, if it is a structure which becomes outside from the radioactive material adsorbent of the said woven form or a nonwoven fabric form, in order to prevent the outflow of the lead sheet for gamma ray shielding inside the ton bag, and contaminated water out of the system A water shielding layer may be added. As the water shielding layer, for example, a sheet mainly composed of an ethylene vinyl acetate copolymer, a sheet mainly composed of vinyl chloride, a sheet mainly composed of polyethylene, and the like can be used.

The case where the textile product is a crop protection sheet will be described. This product, for example, by covering fruits such as apples, adsorbs radioactive substances such as cesium floating in the air or integrated with dust and dust with the crop protection sheet, and so on. This is a sheet for preventing the influence of radioactive materials. In this case, the form of the radioactive substance adsorbent is not particularly limited, but is preferably a woven fabric or a non-woven fabric, and more preferably a non-woven fabric. When it is a non-woven fabric, it is preferably a spunbond non-woven fabric. The basis weight of the nonwoven fabric, and more preferably is preferably about 15 to 50 g / ^{m 2,} is about 30 g / ^{m 2.} What is necessary is just to use what was produced as mentioned above as a radioactive substance adsorbent of the said nonwoven fabric form. Similarly, what was produced as mentioned above should just be used as a radioactive material adsorption material of the above-mentioned textile form.

The case where the textile product is a decontamination sheet in an aqueous system such as a reservoir or a pool will be described. This product is a sheet for adsorbing radioactive substances such as cesium existing in water by immersing the sheet in water when radioactive substances such as cesium exist in a reservoir. In this case, the form of the radioactive substance adsorbent is not particularly limited, but is preferably a woven fabric or a non-woven fabric, and more preferably a non-woven fabric. In the case of a nonwoven fabric, it is preferably a spunbond nonwoven fabric, a needle punched nonwoven fabric, or a chemical bond nonwoven fabric. The basis weight of the nonwoven fabric, and more preferably is preferably about 50 to 100 g / ^{m 2,} is about 100 g / ^{m 2.} What is necessary is just to use what was produced as mentioned above as a radioactive substance adsorbent of the said nonwoven fabric form, When using a binder, it is preferable to use a water-resistant binder. Similarly, as the radioactive material adsorbent in the form of the woven fabric, a material prepared as described above may be used. However, when a binder is used, it is preferable to use a water-resistant binder. As the water-resistant binder, for example, “Sungrip TKS-1000” manufactured by Sanwa Polymer Industries can be used.

The case where the textile product is a rainwater piping sheet will be described. This product is a sheet for reducing the amount of radioactive substances such as cesium flowing into sewage by arranging the sheet at the exit of a rain gutter in the home. In this case, the form of the radioactive substance adsorbent is not particularly limited, but is preferably a woven fabric or a non-woven fabric, and more preferably a non-woven fabric. In the case of a nonwoven fabric, it is preferably a spunbond nonwoven fabric, a needle punched nonwoven fabric, or a chemical bond nonwoven fabric. The basis weight of the nonwoven fabric, preferably at 15 g / ^{m 2} or more, more preferably 15 to 50 g / ^{m 2.} What is necessary is just to use what was produced as mentioned above as a radioactive substance adsorbent of the said nonwoven fabric form. Similarly, what was produced as mentioned above should just be used as a radioactive material adsorption material of the above-mentioned textile form. In addition, when a sheet-like net formed by irregularly intersecting a plurality of continuous filaments having a thickness of 0.1 to 10 mm is integrated on at least one surface of the radioactive material adsorbent in the form of woven fabric or nonwoven fabric, This is preferable because it improves drainage.

The case where the textile product is a cartridge filter will be described. This product can reduce the amount of radioactive substances such as cesium contained in contaminated water by passing contaminated water generated when decontaminated contaminated soil and the like are passed through the filter. The structure of the fiber product is not particularly limited. For example, the radioactive material adsorbent may be wound around the outer periphery of a cartridge filter core body (hereinafter referred to as a mold) obtained by processing a heat-bonding fiber into a cylindrical shape. . Moreover, the said radioactive substance adsorbent using the fiber raw material comprised by the heat-fusion fiber can also be shape | molded by the heat processing to a cylinder shape, and can also be set as a mold. Although the form of the said radioactive substance adsorption material to be used is not specifically limited, The former includes a spunbond nonwoven fabric, a spunlace nonwoven fabric, a chemical bond nonwoven fabric, and the like. Examples of the latter include thermal bond nonwoven fabrics, air-through nonwoven fabrics, and spunlace nonwoven fabrics composed of heat-bonding fibers. As the basis weight of the nonwoven fabric, those in the range of 15 to 30 g / m ² are preferably used. What is necessary is just to use what was produced as mentioned above as a radioactive substance adsorbent of the said nonwoven fabric form. Specifically, a radioactive material adsorbent in the form of a powder prepared by cutting rayon fibers dyed by a known method using a dye bath containing a metal phthalocyanine dye at a concentration of 10% with a fiber length of 0.1 mm, The powder-form radioactive substance adsorbent is uniformly dispersed in an aqueous solution, and supported on the surface of the nonwoven fabric together with a binder by any method such as gravure printing, spraying, roll coater, or application by brush. In addition, a rayon fiber dyed by a known method using a dye bath containing a metal phthalocyanine dye at a predetermined concentration, for example, 10%, is cut to a fiber length of 5 mm, mixed with other constituent fibers, and airlaid. Alternatively, the web may be made into a non-woven fabric by the paper making method. In addition, the metal phthalocyanine pigment may be uniformly dispersed in an aqueous solution together with a binder and supported on the spunbond nonwoven fabric surface by a method such as coating by gravure printing.

The case where the textile product is a cleaner pack will be described. For example, this product can adsorb radioactive substances such as cesium adhering to dust by attaching it to a vacuum cleaner and sucking dust. In this case, the form of the radioactive substance adsorbent is not particularly limited, but is preferably a woven fabric, paper or non-woven fabric, and more preferably a non-woven fabric. In the case of a nonwoven fabric, it is preferably a spunbond nonwoven fabric or a needle punched nonwoven fabric. Basis weight of the nonwoven fabric is preferably 15 g / ^{m 2} or more, more preferably 15 to 35 g / ^{m 2.} What is necessary is just to use what was produced as mentioned above as a radioactive substance adsorbent of the said nonwoven fabric form. Similarly, what was produced as mentioned above should just be used as a radioactive material adsorption material of the above-mentioned textile form. Moreover, it is preferable that the said cleaner pack has a laminated structure of the reinforcement layer / the said radioactive substance adsorbent / microfiltration layer arrange | positioned in an order from the side which contacts garbage. The reinforcing layer can be composed of, for example, a polypropylene spunbond nonwoven fabric, and the microfiltration layer can be composed of, for example, an SMS nonwoven fabric (a nonwoven fabric having a three-layer structure of a spunbond nonwoven fabric, a meltblown nonwoven fabric, and a spunbond nonwoven fabric). Specifically, the cleaner pack may have a laminated structure of polypropylene spunbond nonwoven fabric / radioactive material adsorbent / SMS nonwoven fabric. In this case, it is preferable that the surface of the nonwoven fabric (radioactive material adsorbent) carrying the metal phthalocyanine compound or the like is on the SMS nonwoven fabric side because the risk of dropping off the compound or the like is small. In addition, by using a polypropylene spunbond nonwoven fabric as a reinforcing layer on the side in contact with dust, the adhesiveness when the cleaner pack is produced by heat sealing is improved. Polypropylene spunbonded nonwoven fabric as the reinforcing layer is preferably basis weight is 5 to 50 g / ^{m 2,} the SMS nonwoven fabric is preferably basis weight is 30~35g / ^{m 2.}

The case where the textile product is protective clothing will be described. This product can adsorb radioactive substances such as cesium by wearing it when working in an environment contaminated with radioactive substances such as cesium. In this case, the form of the radioactive substance adsorbent is not particularly limited, but is preferably a woven fabric or a non-woven fabric, and more preferably a non-woven fabric. Moreover, you may use what laminated | stacked polyethylene, a polypropylene, ethylene vinyl alcohol, urethane etc. to the said nonwoven fabric (radioactive material adsorption material). In this case, the thickness of the laminate part is preferably 10 to 30 μm. Note that the laminated surface is preferably used on the human body side. In the case of a nonwoven fabric, it is preferably a spunbond nonwoven fabric or an SMS nonwoven fabric. Basis weight of the nonwoven fabric is preferably at 50 g / ^{m 2} or more, and more preferably 60~80g / ^{m 2.} What is necessary is just to use what was produced as mentioned above as a radioactive substance adsorbent of the said nonwoven fabric form. Similarly, what was produced as mentioned above should just be used as a radioactive material adsorption material of the above-mentioned textile form. Moreover, you may produce protective clothing using the fabric which mixed the other fiber raw material and the radioactive material adsorbent of the said woven fabric or a nonwoven fabric form. Moreover, you may produce protective clothing with the fabric of 2 or more layers which piled up the radioactive material adsorption material of the other textile material and the said textile fabric or a nonwoven fabric form. Examples of other fiber materials include polyethylene film laminated nonwoven fabric, SMS nonwoven fabric, and flash bond nonwoven fabric.

The case where the textile product is a scattering prevention sheet will be described. This product is a radioactive substance such as cesium that is integrated with dust or dust that is blown away by high-pressure water, etc. by using it at the boundary with the adjacent land when decontaminating the house from outside using high-pressure water, etc. Can be adsorbed. In this case, the form of the radioactive substance adsorbent is not particularly limited, but is preferably a woven fabric or a non-woven fabric, and more preferably a non-woven fabric. Moreover, you may use what laminated | stacked polyethylene, a polypropylene, ethylene vinyl alcohol, urethane, etc. on the single side | surface of the said nonwoven fabric (nonwoven fabric form radioactive material adsorption material). In this case, the thickness of the laminate part is preferably 5 to 200 μm. In addition, it is preferable to use the laminated surface for the adjacent ground side. In the case of a nonwoven fabric, it is preferably a spunbond nonwoven fabric or a needle punched nonwoven fabric. The basis weight of the nonwoven fabric is preferably 15 to 200 g / m ² . What is necessary is just to use what was produced as mentioned above as a radioactive substance adsorbent of the said nonwoven fabric form. Similarly, what was produced as mentioned above should just be used as a radioactive material adsorption material of the above-mentioned textile form.

The case where the textile product is an air conditioner filter, a ventilation port filter, a house ventilation system filter, a cleaner main body filter, or a humidifier / dehumidifier pre-filter will be described. These products include, for example, a radioactive substance such as cesium floating in the air or integrated with dust or dust, such as a filter for an air conditioner, a vent filter, a filter for a house ventilation system, a filter for a vacuum cleaner, It can be adsorbed with a humidifier / dehumidifier pre-filter and used as a filter to prevent further contamination. In this case, the form of the radioactive substance adsorbent is not particularly limited, but is preferably a woven fabric or a non-woven fabric, and more preferably a non-woven fabric. In the case of a nonwoven fabric, it is preferably a spunbond nonwoven fabric, a chemical bond nonwoven fabric, or an air-through nonwoven fabric. The basis weight of the nonwoven fabric, preferably at 15 g / ^{m 2} or more, and more preferably 15~300g / ^{m 2.} What is necessary is just to use what was produced as mentioned above as a radioactive substance adsorbent of the said nonwoven fabric form. Similarly, what was produced as mentioned above should just be used as a radioactive material adsorption material of the above-mentioned textile form.

The case where the textile product is an air purifier filter, an air conditioning filter used in a building, a hospital, a factory, or the like or an automobile air conditioner filter will be described. These products include, for example, air-conditioning filters or automobiles that use radioactive substances such as cesium floating in the atmosphere or integrated with dust or dust in air cleaner filters, buildings, hospitals, factories, etc. It can be adsorbed with an air conditioner filter and used as a filter to prevent further contamination. In this case, the form of the radioactive substance adsorbent is not particularly limited, but is preferably a woven fabric or a non-woven fabric, and more preferably a non-woven fabric. In the case of the said nonwoven fabric, it is preferable that they are a spun bond nonwoven fabric, a chemical bond nonwoven fabric, and an air through nonwoven fabric. The non-woven fabric can be used alone, or the non-woven fabric-type radioactive material adsorbent of the present invention can be used as an aggregate of a filter, and a laminate bonded to another non-woven fabric can be used for pleating. The basis weight of the nonwoven fabric, preferably at 15 g / ^{m 2} or more, and more preferably 15~120g / ^{m 2.} What is necessary is just to use what was produced as mentioned above as a radioactive substance adsorbent of the said nonwoven fabric form. Similarly, what was produced as mentioned above should just be used as a radioactive material adsorption material of the above-mentioned textile form.

  An example of a house decontamination method using the textile product of the present invention will be described below.

First, advance preparation will be described.
(1) An operator wears the protective clothing and mask of the present invention.
(2) Install scaffolding around the decontaminated house. A soundproof sheet is installed on the scaffold, and the scattering prevention sheet of the present invention is installed inside the soundproof sheet (on the decontamination target house side).
(3) A blue sheet for collecting cleaning water is installed with a slope from the base of the outdoor wall of the house, a rain gutter is installed at the tip of the blue sheet (opposite the house), and the rain gutter exit for collecting water The rainwater piping sheet of the present invention is installed in the part.

Next, the decontamination method for each part will be described.
(roof)
Wash the tile surface with high pressure water. Wash water is collected at the container through a rain gutter attached to the tip of the blue sheet and provided with the rain water piping sheet of the present invention at the outlet.
(wall)
Wash the wall surface with high pressure water. Wash water is collected at the container through a rain gutter attached to the tip of the blue sheet and provided with the rain water piping sheet of the present invention at the outlet.
(Window, door pocket, etc.)
Dust and the like are sucked with a vacuum cleaner equipped with the cleaner pack of the present invention.
(Ground ground)
The surface soil is cut and stored in the ton bag of the present invention.

Finally, processing after the decontamination work is completed will be described.
(Washing water treatment)
The washed water collected is passed through the cartridge filter of the present invention.
(Waste treatment)
The rainwater piping sheet, cleaner pack, protective clothing, mask, cartridge filter and the like of the present invention used above are stored in a ton bag storing the surface soil. A hole is dug in the ground, and the contaminated soil sheet of the present invention is arranged around the hole, and then a ton bag storing each waste is buried in the ground.

  Hereinafter, the present invention will be described more specifically with reference to examples. In addition, this invention is not limited to the following Example.

  Measurement methods and evaluation methods used in Examples and Comparative Examples are as follows.

(Primary swelling degree)
It measured according to JIS L-1015 7.25.

(Cesium adsorption rate)
For sheet-like samples, 4 ml of 0.05% cesium chloride aqueous solution was brought into contact with 1000 cm ² , and for cotton-like samples (fibers), 1.5 ml of 0.05% cesium chloride aqueous solution was brought into contact with 0.5 g. The concentration of cesium in the aqueous solution was measured using μ-EDX (energy dispersive micro fluorescent X-ray analyzer, manufactured by Shimadzu Corporation).

(Dye or pigment concentration)
The dye concentration was calculated by the mass of the dye relative to the fiber mass, and the pigment concentration was calculated by the mass of the pigment dispersion relative to the fiber mass.

(Preparation of amorphous rayon fiber 1)
Viscose was spun in accordance with a conventional method except that 7% by weight of Na ₂ SO ₄ was added to the viscose and regenerated to obtain rayon fibers having a fineness of 6.7 dtex. This rayon fiber had many amorphous parts and the primary swelling degree was 250%. This rayon fiber was cut into 51 mm.

Example 1
In a 1000 ml beaker, 1000 g of water, 100 g of Na ₂ SO ₄ , Reactive Blue 21 (Sumifix Turquoise Blue G 150%, manufactured by Sumitomo Chemical Co., Ltd.) 10 g (concentration 10%), and Na ₂ CO ₃ 50 g are stirred and dissolved. . 100 g of amorphous rayon fiber 1 was immersed in the resulting dye bath, and the mixture was kept warm at 70 ° C. for 60 minutes. Next, the amorphous rayon fiber 1 was taken out, washed with water and dried to obtain a radioactive material adsorbent in the form of fibers of Example 1 dyed dark blue.

(Example 2)
A radioactive material adsorbent in the form of fibers of Example 2 was obtained in the same manner as in Example 1 except that the amount of reactive blue 21 added was changed to 12 g (concentration 12%).

(Example 3)
A radioactive material adsorbent in the form of fibers of Example 3 was obtained in the same manner as Example 1 except that the amount of reactive blue 21 added was changed to 15 g (concentration 15%).

Example 4
Copper phthalocyanine pigment dispersion (Blue FLGB Conc, manufactured by Dainichi Seika Kogyo Co., Ltd.) 10 g and acrylic binder (Matsumin Super White RBW4TMO, Matsui Color Chemical Co., Ltd.) 82 g are uniformly dispersed in 8 g of water. I let you. Using the obtained pigment dispersion, gravure printing was performed on a 100% polyester fiber spunbonded nonwoven fabric (weight per unit: 25 g / m ² , manufactured by Asahi Kasei Co., Ltd.) to obtain a radioactive material adsorbent in the form of a nonwoven fabric of Example 4. .

(Example 5)
10 g of copper phthalocyanine pigment dispersion (Blue FLGB Conc, manufactured by Dainichi Seika Kogyo Co., Ltd.), 2 g of bitumen (ferrocyanide, 671 milory blue, Dainichi Seika Kogyo Co., Ltd.), and acrylic binder (Matsumin Super White) 80 g of RBW4TMO (manufactured by Matsui Dye Chemical Co., Ltd.) was uniformly dispersed in 8 g of water. Using the resulting pigment dispersion, gravure printing was performed on a 100% polyester fiber spunbonded nonwoven fabric (basis weight: 25 g / m ² , manufactured by Asahi Kasei Co., Ltd.) to obtain a radioactive material adsorbent in the form of a nonwoven fabric of Example 5. .

(Example 6)
20 g of copper phthalocyanine pigment dispersion (Blue FLGB Conc, manufactured by Dainichi Seika Kogyo Co., Ltd.), 2 g of bitumen (ferrocyanide, 671 milory blue, Dainichi Seika Kogyo Co., Ltd.), and acrylic binder (Matsumin Super White) 70 g of RBW4TMO (manufactured by Matsui Dye Chemical Co., Ltd.) was uniformly dispersed in 8 g of water. Using the resulting pigment dispersion, gravure printing was performed on a 100% polyester fiber spunbonded nonwoven fabric (weight per unit: 25 g / m ² , manufactured by Asahi Kasei Co., Ltd.) to obtain a radioactive material adsorbent in the form of a nonwoven fabric of Example 6. .

(Example 7)
Copper phthalocyanine pigment dispersion (Blue FLGB Conc, manufactured by Dainichi Seika Kogyo Co., Ltd.) 10 g and acrylic binder (Matsumin Super White RBW4TMO, Matsui Color Chemical Co., Ltd.) 82 g are uniformly dispersed in 8 g of water. I let you. Using the obtained pigment dispersion, gravure printing was performed on a spunlace nonwoven fabric (weight per unit: 50 g / m ² , manufactured by Shinwa) composed of 50% polyester fiber and 50% rayon fiber (cellulosic fiber). Thus, a radioactive material adsorbent in the form of 7 was obtained.

(Example 8)
10 g of copper phthalocyanine pigment dispersion (Blue FLGB Conc, manufactured by Dainichi Seika Kogyo Co., Ltd.), 2 g of bitumen (ferrocyanide, 671 milory blue, Dainichi Seika Kogyo Co., Ltd.), and acrylic binder (Matsumin Super White) 80 g of RBW4TMO (manufactured by Matsui Dye Chemical Co., Ltd.) was uniformly dispersed in 8 g of water. Using the obtained pigment dispersion, gravure printing was performed on a spunlace nonwoven fabric (weight per unit: 50 g / m ² , manufactured by Shinwa) composed of 50% polyester fiber and 50% rayon fiber (cellulosic fiber). Eight radioactive material adsorbents were obtained.

Example 9
9 g of copper phthalocyanine pigment dispersion (Blue FLGB Conc, manufactured by Dainichi Seika Kogyo Co., Ltd.), 2 g of bitumen (ferrocyanide, 671 milory blue, Dainichi Seika Kogyo Co., Ltd.), and acrylic binder (Matsumin Super White) RBW4TMO (manufactured by Matsui Dye Chemical Co., Ltd.) (81 g) was uniformly dispersed in 8 g of water. Using the resulting pigment dispersion, gravure printing was performed on a 100% polyester fiber spunbonded nonwoven fabric (weight per unit: 25 g / m ² , manufactured by Asahi Kasei Co., Ltd.) to obtain a radioactive material adsorbent in the form of a nonwoven fabric of Example 9. .

(Example 10)
8 g of copper phthalocyanine pigment dispersion (Blue FLGB Conc, manufactured by Dainichi Seika Kogyo Co., Ltd.), 2 g of bitumen (Iron Ferrocyanide, 671 Milory Blue, manufactured by Dainichi Seika Kogyo Co., Ltd.), and acrylic binder (Matsumin Super White) 82 g of RBW4TMO (manufactured by Matsui Dye Chemical Co., Ltd.) was uniformly dispersed in 8 g of water. Using the obtained pigment dispersion, gravure printing was performed on a 100% polyester fiber spunbonded nonwoven fabric (weight per unit: 25 g / m ² , manufactured by Asahi Kasei Co., Ltd.) to obtain a radioactive material adsorbent in the form of a nonwoven fabric of Example 10. .

(Comparative Example 1)
Non-dyed amorphous rayon fiber 1 was used as Comparative Example 1.

(Comparative Example 2)
A non-dyed 100% spunbond nonwoven fabric (weight per unit: 25 g / m ² , manufactured by Asahi Kasei Co., Ltd.) was used as Comparative Example 2.

(Comparative Example 3)
A spunlace nonwoven fabric (weight per unit: 50 g / m ² , manufactured by Shinwa) composed of 50% undyed polyester fiber and 50% rayon fiber (cellulosic fiber) was used as Comparative Example 3.

(Reference Example 1)
Disperse 2 g of bitumen (ferrocyanide, 671 milory blue, manufactured by Dainichi Seika Kogyo Co., Ltd.) and 90 g of acrylic binder (Matsumin Super White RBW4TMO, manufactured by Matsui Pigment Chemical Co., Ltd.) uniformly in 8 g of water. I let you. Using the obtained dispersion, gravure printing was performed on a spunbonded nonwoven fabric (weight per unit: 25 g / m ² , manufactured by Asahi Kasei Co., Ltd.) with 100% polyester fiber, and the obtained nonwoven fabric was used as Reference Example 1.

(Reference Example 2)
Disperse 2 g of bitumen (ferrocyanide, 671 milory blue, manufactured by Dainichi Seika Kogyo Co., Ltd.) and 90 g of acrylic binder (Matsumin Super White RBW4TMO, manufactured by Matsui Pigment Chemical Co., Ltd.) uniformly in 8 g of water. I let you. Using the obtained dispersion, gravure printing was performed on a spunlace nonwoven fabric (weight per unit: 50 g / m ² , manufactured by Shinwa) composed of 50% polyester fiber and 50% rayon fiber (cellulosic fiber), and the resulting nonwoven fabric To Reference Example 2.

(Example 11)
A crop protection sheet, which is a textile product of the present invention having a width of 100 cm and a length of 50 m, as in Example 5, except that the basis weight of the nonwoven fabric used as the fiber material is changed to 20 g / m ² (manufactured by Asahi Kasei Corporation). Got.

(Example 12)
Except that the basis weight of the nonwoven fabric used as the fiber material was changed to 50 g / m ² (manufactured by Asahi Kasei Co., Ltd.), in the same manner as in Example 5, for the rainwater piping which is the fiber product of the present invention having a width of 50 cm and a length of 50 cm A sheet was obtained.

(Example 13)
A nonwoven fabric (nonwoven fabric-shaped radioactive material adsorbent) obtained in the same manner as in Example 5 except that the basis weight of the nonwoven fabric used as the fiber material was changed to 100 g / m ² (manufactured by Asahi Kasei Corporation). The ton bag (flexible container bag) which is a textile product of the present invention was obtained by sewing into a rectangular parallelepiped shape having a height of 90 cm and a height of 90 cm.

  The cesium adsorption rate of the radioactive material adsorbent in the fiber form or nonwoven fabric form of the examples and the fiber or nonwoven fabric of the comparative example was measured as described above, and the results are shown in Table 1 below. The concentration of the dye or pigment is also shown in Table 1 below.

(Example 14)
A card web was prepared using a core-sheath composite fiber (fineness: 2.2 dtex, fiber length: 62 mm, manufactured by Daiwabo Polytech Co., Ltd.) having a core component of polypropylene and a sheath component of polyethylene, and a hot air dryer (130 ° C., 30 Second), the film was wound around an iron core having a diameter of 30 mm to produce a mold having an outer diameter of 45 mm and a length of 1300 mm. On the outer periphery of the obtained mold, 8 m of the radioactive material adsorbent in the form of a nonwoven fabric of Example 6 is wound, and a heat-sealed fiber nonwoven fabric (weight per unit: 30 g) using a core-sheath composite fiber in which the core component is polypropylene and the sheath component is polyethylene. / M ² ) is wound until the outer diameter reaches 58 mm, the heated roll is brought into contact with the outer layer portion of the heat-bonded fiber nonwoven fabric, and the length is cut to 250 mm. The product cartridge filter was obtained.

  The cesium adsorption rate of the cartridge filter obtained in Example 14 was measured as follows, and the results are shown in Table 1 below.

(Cesium adsorption rate of cartridge filter)
The cartridge filter was set in a filtration tester (manufactured by Daiwabo Progress Co., Ltd.), and 20 L of 0.05% cesium chloride aqueous solution was circulated for 1 hour while filtering at 30 L / min. After 1 hour, the cesium concentration in the aqueous solution was measured using μ-EDX (energy dispersive micro fluorescent X-ray analyzer, manufactured by Shimadzu Corporation).

  From the comparison between Examples 1 to 3 and Comparative Example 1 in Table 1, the comparison between Example 4 and Comparative Example 2, and the comparison between Example 7 and Comparative Example 3, the fiber material carrying the metal phthalocyanine compound of the Example is It was found that the cesium adsorption rate was high and had a cesium adsorption effect. As can be seen from the data of Examples 1 to 3 and Examples 5 to 6, the higher the concentration of the dye in the dye bath or the pigment in the pigment dispersion, that is, the higher the amount of the metal phthalocyanine compound supported, the more cesium. It was found that the adsorption rate was high. In addition, as can be seen from the comparison between Example 4 and Example 5 and Reference Example 1 and the comparison between Example 7 and Example 8 and Reference Example 2, the combination of the metal phthalocyanine compound and the ferrocyanide is more suitable for cesium adsorption. The rate was high. Moreover, the cesium adsorption rate of the crop protection sheet of Example 11 which is the textile product of the present invention, the sheet for rainwater piping of Example 12 and the flexible container bag of Example 13 is 90% or more, and has excellent cesium removal performance. I found out. Further, the fiber product (cartridge filter) of Example 14 formed using the radioactive material adsorbent (nonwoven fabric form) of Example 6 also has a cesium adsorption rate of 90% or more and excellent cesium removal performance. I understood.

(Example 15)
Polypropylene spunbonded nonwoven fabric (weight per unit: 30 g / m ² , manufactured by Asahi Kasei Co., Ltd.), nonwoven fabric obtained in Example 9 (weight per unit: 25 g / m ² ), SMS nonwoven fabric (weight per unit: 30 g / m ² , manufactured by Mitsui Chemicals, Inc.) ) Were laminated in this order, and the laminated nonwoven fabric obtained was cut into a predetermined size. Next, heat seal bonding is performed, a dust inlet is made, a cardboard is attached so that it can be used for vacuum cleaners of various home appliance manufacturers, and a cleaner pack (width of about 21 cm, length of about 31 cm) as a textile product of the present invention is attached. Obtained. In the cleaner pack, the polypropylene spunbond nonwoven was placed on the dust side.

The performance of the cleaner pack obtained in Example 15 was evaluated by the following test.

<Durability test>
In continuous operation during actual use, the durability of the cleaner pack mounting portion and the strength of the cleaner pack under harsh conditions was confirmed by performing continuous operation for 2 hours after sucking 20 g of talc. Vacuum cleaner manufactured by Panasonic Corporation (hereinafter referred to as P) (model number MC-K9J), Toshiba Corporation (hereinafter referred to as T company) vacuum cleaner (model number VC-PZ8D), Hitachi Ltd. (hereinafter referred to as company H). Durability tests were performed on two specimens each in a vacuum cleaner (model number CV-PP8) and a vacuum cleaner (model number Be-KTC-FXA7PA) manufactured by Mitsubishi Electric Corporation (hereinafter referred to as M company). As a result, none of the cleaner packs were broken or scratched.

<Broken bag test>
The strength of the cleaner pack and the strength of the cleaner pack in a situation where a severe pressure loss was forcibly made during actual use were confirmed by sucking 40 g of talc and applying an instantaneous load to the vacuum cleaner. In the vacuum cleaner made by company P (model number MC-K9J), the cleaner made by company T (model number VC-PZ8D), the cleaner made by company H (model number CV-PP8), and the cleaner made by company M (model number Be-KTC-FXA7PA) A bag breaking test was performed for each of three specimens. As a result, none of the cleaner packs were broken or scratched.

<Heat resistance test>
Severe pressure loss after 20g of talc is sucked into the heat resistance of the cleaner pack mounting strength and cleaner pack strength under the condition that severe pressure loss during actual use is forcibly made This was confirmed by carrying out continuous operation. A heat test was performed for each specimen in a vacuum cleaner manufactured by H Company (model number CV-PP8). As a result, all of the cleaner packs had no adhesive peeled, no broken bags or scratches.

<Suction pressure test>
In dust suction during actual use, the effective usage range of the cleaner pack under severe conditions was confirmed by the change in suction pressure. Specifically, the talc was sucked every 5 g, and the suction pressure was measured until the total suction amount became 20 g. Two specimens were subjected to a suction pressure test in a vacuum cleaner manufactured by Company H (model number CV-PP8). As a result, all the cleaner packs had no bag breakage or scratches, and the suction pressure was good.

<Dust leak test>
In dust suction during actual use, we confirmed the state of dust leaks and dirt in the vacuum cleaner that the user might feel. Specifically, after sucking 20 g of talc, the state of dust leakage was confirmed. As a result of performing a dust leakage test on two specimens using a vacuum cleaner manufactured by Company H (model number CV-PP8), there was no dust leakage in any of the cleaner packs.

<Buckwheat test>
In dust suction during actual use, the durability of the cleaner pack when suctioning sharp dust was confirmed by sucking 20 g of buckwheat and operating for 1 hour. As a result of performing a test of buckwheat husks on two specimens using a vacuum cleaner manufactured by Company H (model number CV-PP8), all the cleaner packs were free of broken bags or scratches even after 1 hour.

As can be seen from the results of the durability test, the bag breaking test, the heat resistance test, the suction pressure test, the dust leakage test, and the buckwheat test, there was no problem in the quality of the cleaner pack of Example 15.

The cesium adsorptivity of the cleaner pack of Example 15 was evaluated as follows. As a comparative product, the cesium adsorptivity of a commercially available paper pack was also evaluated in the same manner. The results are shown in Table 2 below.

(Cesium adsorption test)
(1) Sample: An incinerator-contaminated ash (about 100,000 Bq) contaminated with cesium 137 was mechanically pulverized.
(2) Test method: A sample was sucked with a vacuum cleaner (model number VC-PZ8D) 500W (medium) manufactured by T company, and the measuring instrument was placed at three locations on the cleaner body filter, exhaust air, and the cleaner pack removed from the cleaner. The cesium dose was measured for 10 minutes while touching.
(3) Measuring instrument: A radiation survey meter (RDS-30 type, manufactured by Rados, measurement range 0.01 μS / h to 100 mS / h) was used.

  As can be seen from the results in Table 2 above, the cleaner pack of Example 15 adsorbed cesium, so that the cesium dose of the exhaust air was reduced.

(Example 16)
From the mouth side, 50% by mass of polypropylene and 50% by mass of air-through nonwoven fabric (weight per unit: 15 g / m ² , manufactured by Daiwabo Polytech Co., Ltd.), 50% by mass of rayon and 50% by mass of polyester (weight per unit: 50 g / m ²⁾ , Manufactured by Daiwabo Polytech Co., Ltd.), polypropylene melt blown nonwoven fabric (weight per unit: 20 g / m ² , manufactured by Tapirs Co., Ltd.), and the nonwoven fabric of Example 10 (nonwoven fabric form radioactive material adsorbent) are laminated in this order to form a filtration layer. The mask which is the textile product of this invention was obtained. In addition, in the nonwoven fabric (radioactive material adsorption material of a nonwoven fabric form) of Example 10, it arrange | positioned so that the surface which carried out the gravure printing of the pigment might contact | connect a polypropylene melt blown nonwoven fabric. The mask of Example 16 has an excellent adsorbing effect on radioactive substances such as cesium by including the nonwoven fabric of Example 10 (radioactive material adsorbent in the form of a non-woven fabric) with a cesium adsorption rate of 90.0% or more in the filtration layer. It seems to demonstrate.

(Example 17)
10 g of copper phthalocyanine pigment dispersion (Blue FLGB Conc, manufactured by Dainichi Seika Kogyo Co., Ltd.), 2 g of bitumen (ferrocyanide, 671 milory blue, Dainichi Seika Kogyo Co., Ltd.), and acrylic binder (Matsumin Super White) 80 g of RBW4TMO (manufactured by Matsui Dye Chemical Co., Ltd.) was uniformly dispersed in 8 g of water. Using the resulting pigment dispersion, gravure printing was performed on a 100% polyester fiber spunbond nonwoven fabric (weight per unit: 50 g / m ² , manufactured by Asahi Kasei Co., Ltd.) to obtain a radioactive material adsorbent in the form of a nonwoven fabric of Example 17. . When the cesium adsorption rate of the radioactive material adsorbent in the nonwoven fabric form of Example 17 was measured as described above, it was 90.0% or more.

(Example 18)
The nonwoven fabric (radioactive material adsorbent in the form of nonwoven fabric) of Example 17 was formed into a single-piece (connecting type, with hood) protective suit (size: XL, height: 180 to 188 cm, chest width: 108 to 116 cm). Combined, cut and sewed before and after the hood, the upper body with sleeves (up to the lower rib) and the lower body. The sewn portion was reinforced with water leakage prevention tape, and rubber was attached to the face portion, cuff portion, and ankle portion to obtain an integrated protective clothing that is a textile product of the present invention. Since the obtained protective clothing is made of a nonwoven fabric (nonwoven fabric-type radioactive material adsorbent) having a cesium adsorption rate of 90.0% or more, it exhibits an excellent adsorption effect for radioactive materials such as cesium.

(Example 19)
The nonwoven fabric of Example 17 (non-woven fabric-shaped radioactive material adsorbent) is a simple type (no lower body type, with hood) protective clothing (size: XL, height: 180 to 188 cm, adaptive chest circumference: 108 to 116 cm). According to the mold, it was cut before and after the hood and upper body (up to the knee) and sewn. The sewn portion was reinforced with a water leakage prevention tape, and rubber was attached to the face portion to obtain a simple protective clothing that is a textile product of the present invention. Since the obtained protective clothing is made of a nonwoven fabric (nonwoven fabric-type radioactive material adsorbent) having a cesium adsorption rate of 90.0% or more, it exhibits an excellent adsorption effect for radioactive materials such as cesium.

(Example 20)
A non-woven fabric (non-woven fabric-shaped radioactive material adsorbent) obtained in the same manner as in Example 5 is set in an extrusion laminator, integrated with a 50 μm-thick polyethylene film, and is a fiber product of the present invention having a width of 95 cm and a length of 500 m. A scattering prevention sheet was obtained.

(Example 21)
Instead of using a 100% polyester fiber spunbonded nonwoven fabric (weight per unit: 25 g / m ² , manufactured by Asahi Kasei Co., Ltd.), except that a 100% polyester fiber spunbonded nonwoven fabric (weight per unit: 100 g / m ² , manufactured by Asahi Kasei Co., Ltd.) was used. Produced a radioactive material adsorbent in the form of a nonwoven fabric in the same manner as in Example 5. The obtained non-woven fabric (non-woven fabric-shaped radioactive material adsorbent) was laminated in four layers and sewed into a bag shape having a width of 45 cm and a length of 50 cm to obtain a flexible container bag which is a textile product of the present invention. As shown in FIG. 1, in the flexible container bag 10 of this invention, the nonwoven fabric laminated | stacked on four layers becomes the filter 1, the filter 2, the filter 3, and the filter 4 in order from the outer side.

  The flexible container bag 10 is loaded with sand (1 kg) and installed in running water containing radioactive substances as shown in FIG. 1, and each layer of non-woven fabric (non-woven fabric radioactive material adsorbent), sand, and flexible container Cesium adsorptivity in running water before and after passing through the bag was measured and evaluated as follows. In FIG. 1, arrows indicate the flow direction of running water.

(Cesium adsorption test)
(1) Running water containing radioactive materials We used running water generated by collecting cleaning water after decontamination work in private houses in Fukushima Prefecture in the gutter.
(2) Test method The flexible container bag of this invention which piled up sand in the running water containing a radioactive substance was installed, and it was left to stand for 30 minutes. Thereafter, the running water before and after passing through the flexible container bag is sampled. Moreover, the nonwoven fabric of each layer and the sand in a flexible container bag were collect | recovered, each 5 place was set to the measuring device for 1000 second, and the cesium density | concentration was measured.
(3) Measurement method The cesium concentration was determined in accordance with gamma ray spectrometry using a germanium semiconductor detector (1992, Ministry of Education, Culture, Sports, Science and Technology). The measurement results are shown in Table 3 below.

As can be seen from the results in Table 3, the cesium concentration in the running water after passing through the flexible container bag was significantly reduced by adsorbing cesium by the flexible container bag of the present invention.

  Since the radioactive material adsorbent of the present invention and the fiber product containing the same adsorb radioactive materials such as cesium, for example, sanitary masks, agricultural sheets, contaminated soil sheets, flexible container bags, crop protection sheets, reservoirs, etc. And decontamination sheets for swimming pools, sheets for rainwater piping, cartridge filters, cleaner packs, protective clothing, sandbags, civil engineering sheets, civil mats, anti-scattering sheets, filters for air conditioners, filters for ventilation openings, filters for residential ventilation systems, It can be used for applications such as vacuum cleaner body filters, humidifier / dehumidifier pre-filters, air cleaner filters, air conditioning filters used in buildings, hospitals and factories, automobile air conditioner filters, water purifier filters, and the like.

1, 2, 3, 4 Filter 5 Sand 10 Flexible container bag

Claims (12)

It is a radioactive material adsorbent composed of fiber material,
A radioactive substance adsorbent characterized in that a metal phthalocyanine compound is supported on the fiber material.   The radioactive material adsorbent according to claim 1, wherein the metal phthalocyanine compound is a copper phthalocyanine dye or a copper phthalocyanine pigment.   The radioactive material adsorbent according to claim 1, wherein the fiber material is composed of cellulosic fibers and / or polyester fibers.   The radioactive material adsorbent according to any one of claims 1 to 3, wherein the fiber material is a nonwoven fabric made of polyester fiber.   The radioactive substance adsorbent according to claim 3, wherein the cellulosic fiber is a rayon fiber having a primary swelling degree of 150 to 500%.   The radioactive substance adsorbent according to any one of claims 1 to 5, wherein a ferrocyanide is further supported on the fiber material.   The radioactive substance adsorbent according to claim 6, wherein the ferrocyanide is bitumen.   A textile product comprising the radioactive material adsorbent according to claim 1.   The textile product is a kind selected from the group consisting of a mask, a cartridge filter, a crop protection sheet, an agricultural sheet, a contaminated soil sheet, a rainwater piping sheet, a flexible container bag, a cleaner pack, protective clothing, and a splash prevention sheet. The textile product according to claim 8. A method for producing a radioactive material adsorbent comprising a fiber material,
A method for producing a radioactive material adsorbent, comprising impregnating or applying a solution containing a metal phthalocyanine compound or a dispersion containing a metal phthalocyanine compound on a fiber material, and supporting the metal phthalocyanine compound on the fiber material.   The method for producing a radioactive material adsorbent according to claim 10, wherein the solution contains a metal phthalocyanine dye. The said dispersion liquid is a manufacturing method of the radioactive substance adsorbent of Claim 10 containing a metal phthalocyanine pigment and a binder.

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