JP7014322B1 - Adsorption sheet and protective clothing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adsorption sheet having excellent washing resistance and protective clothing using the adsorption sheet. SOLUTION: The adsorption sheet 1 has a first sheet layer 3, a second sheet layer 4 whose substantially entire surface is bonded to the first sheet layer 3 by an adhesive layer 5, a first sheet layer 3 and a second sheet layer 4. The gas adsorption layer 2 is provided with a gas adsorption layer 2 provided between the two, and the gas adsorption layer 2 is composed of a plurality of particulate adsorbents fixed to the first sheet layer 3 and the second sheet layer 4 by the adhesive layer 5. The adhesive layer 5 is formed by using an adhesive containing a thermoplastic copolymer resin containing an olefin and a carboxylic acid ester as a copolymer component. [Selection diagram] Fig. 1

Description

The present invention relates to an adsorption sheet that adsorbs a gaseous substance. The present invention also relates to a protective garment using an adsorption sheet that adsorbs a gaseous substance, and relates to a protective garment for protecting the body of a human or an animal from harmful substances such as toxic chemical substances.

As an adsorption sheet for protective clothing that protects the human body from gaseous harmful substances, those using activated carbon have been conventionally known. For example, in Patent Document 1, in an adsorption sheet composed of two sheet layers and three layers of gas adsorption layers provided between the two sheet layers, a plurality of adsorption particles made of granular activated carbon are used for adhesion in the gas adsorption layer. An adsorption sheet in which both sheet layers are bonded together by an agent is disclosed. The adhesive is partially and discontinuously applied to the sheet layer in a dot shape or the like, and the plurality of adsorbed particles are fixed between the two sheet layers by the adhesive. Since the adhesive is partially and discontinuously applied, the adsorption sheet of Patent Document 1 has good flexibility and elasticity.

Japanese Patent No. 5714325

Since this type of protective clothing is worn in contact with the skin of the human body, sweat and the like adhere to it, so that it is frequently washed. However, when two sheet layers are bonded together by a partial and discontinuous adhesive as in Patent Document 1, the other sheet layer is likely to be peeled off from one sheet layer when washing is performed a plurality of times. In addition, there is a problem that adsorbed particles can be easily removed between the two sheet layers, but there is no description about washing resistance in Cited Document 1.

The present invention has been made focusing on the above-mentioned problems, and an object of the present invention is to provide an adsorption sheet and protective clothing having excellent wash resistance.

A first aspect of the present invention relates to an adsorption sheet that adsorbs a gaseous substance. The adsorption sheet of the present invention is provided between the first sheet layer, the second sheet layer whose substantially entire surface is bonded to the first sheet layer by the adhesive layer, and the first sheet layer and the second sheet layer. The gas adsorption layer comprises a gas adsorption layer, and the gas adsorption layer is composed of a plurality of particulate adsorbents fixed to the first sheet layer and the second sheet layer by the adhesive layer, and the adhesive layer is composed of a plurality of particulate adsorbents. The first sheet layer and the second sheet layer are formed by using an adhesive containing a thermoplastic copolymer resin containing an olefin and a carboxylic acid ester as a copolymer component, and the first sheet layer and the second sheet layer are woven fabrics, knitted fabrics, or knitted fabrics. It is characterized by being composed of a non-woven fabric .

The adsorption sheet of the present invention is preferably configured such that the carboxylic acid ester is vinyl acetate, and more preferably the copolymer resin is an ethylene / vinyl acetate copolymer resin. It can be configured such that the content of vinyl acetate is 6% by mass or more and 33% by mass or less.

A second aspect of the present invention relates to protective clothing that protects the body of a person or animal from gaseous harmful substances. The protective clothing of the present invention is characterized by using an adsorption sheet having the above-described configuration.

According to the present invention, it is possible to provide an adsorption sheet and protective clothing having excellent washing resistance.

It is an exploded perspective view which shows the schematic structure of the adsorption sheet of this embodiment. It is sectional drawing which shows the schematic structure of the adsorption sheet of this embodiment.

The present invention protects humans and animals from gaseous substances, for example, by adsorbing harmful substances such as toxic chemicals that are absorbed through the skin and have an adverse effect on the human or animal body. Regarding the suction sheet that can be used. The adsorption sheet of the present invention can be used for clothes, gloves, socks, hats, masks, covers, etc., and can be suitably used for protective clothing that can effectively protect workers from, for example, gaseous harmful substances.

The gaseous toxic substance is not particularly limited, but has, for example, one or more carbon elements and a relatively large molecular weight of 50 or more, and can be adsorbed by a gas-adsorptive substance such as activated carbon. Examples thereof include organic phosphorus compounds used in pesticides, pesticides, herbicides, etc., general organic solvents such as toluene, methylene chloride, and chloroform used in paints, poisonous gases used in military gas weapons, etc. Can be mentioned.

The adsorption sheet of the present invention is not limited to applications for adsorbing gaseous harmful substances. For example, it can be applied to the use of adsorbing odors emitted from humans and pets, and can also be used for deodorant underwear such as fart deodorant pants and pet supplies such as pet beds.

Hereinafter, embodiments of the adsorption sheet of the present invention will be described with reference to the accompanying drawings.

Structure of adsorption sheet FIGS. 1 and 2 show the adsorption sheet 1 of the present embodiment. The adsorption sheet 1 includes a gas adsorption layer 2 and two sheet layers 3 and 4 (first sheet layer 3 and second sheet layer 4) sandwiching the gas adsorption layer 2. The two sheet layers 3 and 4 are bonded to each other by the adhesive layer 5, and the gas adsorption layer 2 provided between the two sheet layers 3 and 4 is fixed to the two sheet layers 3 and 4 by the adhesive layer 5.

Gas adsorption layer The gas adsorption layer 2 adsorbs a gaseous substance. The gas adsorption layer 2 can be made of a porous body such as an inorganic adsorbent such as silica gel, zeolite, silicon carbide, or activated alumina, in addition to a carbon adsorbent such as activated carbon or carbon black. The adsorbent can be appropriately selected according to the gaseous substance to be adsorbed, but activated carbon that can adsorb various types of gaseous substances and whose properties do not change even after adsorption should be used. Is preferable.

The adsorbent is in the form of particles such as granules and powder, and the gas adsorbent layer 2 is composed of a plurality of particulate adsorbents. The gas adsorption layer 2 (a plurality of particulate adsorbents) is held between the two sheet layers 3 and 4 by the adhesive force of the adhesive layer 5 that adheres the two sheet layers 3 and 4.

The average particle size of the adsorbent is not particularly limited, but in the case of activated carbon, it is preferably 100 μm or more and 3000 μm or less, and more preferably 170 μm or more and 1000 μm or less. When the average particle size is in the above range, the amount of activated carbon used for the gas adsorption layer 2 to exhibit sufficient adsorption performance can be reduced. Therefore, the adsorption performance of the gas adsorption layer 2 can be improved, the air permeability of the adsorption sheet 1 can be improved, and the weight of the adsorption sheet 1 can be reduced. Therefore, when the suction sheet 1 is applied to protective clothing, the wearing feeling can be improved. In addition, it is possible to suppress the leakage of activated carbon between the two sheet layers 3 and 4.

The specific surface area of the adsorbent is not particularly limited, but in the case of activated carbon, the BET specific surface area is preferably 500 m ² / g or more and 2000 m ² / g or less, and more preferably 600 m ² / g or more and 1800 m ² / g or less. When the BET specific surface area is within the above range, the amount of activated carbon used for the gas adsorption layer 2 to exhibit sufficient adsorption performance can be reduced. Therefore, the adsorption performance of the gas adsorption layer 2 can be improved, the air permeability of the adsorption sheet 1 can be improved, and the lightness and flexibility of the adsorption sheet 1 can be improved in a well-balanced manner. Therefore, when the suction sheet 1 is applied to protective clothing, the wearing feeling can be improved. In addition, the desorption of the adsorbed gaseous substance can be satisfactorily suppressed, and the production of activated carbon can be facilitated.

The average pore diameter of the adsorbent is not particularly limited, but in the case of activated carbon, it is preferably 1.0 nm or more and 5.0 nm or less, and more preferably 1.5 nm or more and 3.0 nm or less. When the average pore diameter is in the above range, the adsorption performance of the gas adsorption layer 2 can be improved, and the desorption of the adsorbed gaseous substance can be satisfactorily suppressed.

The pore volume of the adsorbent is not particularly limited, but in the case of activated carbon, it is preferably 0.05 cm ³ / g or more and 1.0 cm ³ / g or less, and more preferably 0.1 cm ³ / g or more. When the pore volume is within the above range, the amount of activated carbon used for the gas adsorption layer 2 to exhibit sufficient adsorption performance can be reduced. Therefore, the adsorption performance of the gas adsorption layer 2 can be improved, the air permeability of the adsorption sheet 1 can be improved, and the lightness and flexibility of the adsorption sheet 1 can be improved in a well-balanced manner. Therefore, when the suction sheet 1 is applied to protective clothing, the wearing feeling can be improved. In addition, it is possible to suppress the desorption of the adsorbed gaseous substance from the activated carbon, and it is possible to facilitate the production of the activated carbon.

The amount of the adsorbent used is not particularly limited, but in the case of activated carbon, the mass per unit area is preferably 50 g / m ² or more and 250 g / m ² or less, and more preferably 60 g / m ² or more and 200 g / m ² or less. .. When the amount used is within the above range, it is possible to sufficiently secure the capacity of the gaseous substance that can be adsorbed by the gas adsorption layer 2. Therefore, the weight of the adsorption sheet 1 can be reduced while the adsorption time by the gas adsorption layer 2 is lengthened. Therefore, when the suction sheet 1 is applied to protective clothing, the wearing feeling can be improved.

The adsorption capacity of the gaseous substance of the adsorbent is not particularly limited, but in the case of activated carbon, JIS
K1477 (2007) The toluene adsorption performance described in Section 7.8 of "Fibrous Activated Carbon Test Method" is preferably 10 g / m ² or more and 100 g / m ² or less, and more preferably 15 g / m ² or more and 80 g / m ² or less. .. When the toluene adsorption performance is within the above range, the amount of activated carbon used for the gas adsorption layer 2 to exhibit sufficient adsorption performance can be reduced. Therefore, the adsorption performance of the gas adsorption layer 2 can be improved, the air permeability of the adsorption sheet 1 can be improved, and the lightness and flexibility of the adsorption sheet 1 can be improved in a well-balanced manner. Therefore, when the suction sheet 1 is applied to protective clothing, the wearing feeling can be improved.

The gas adsorbent layer 2 is, for example, a method in which a plurality of granular adsorbents are uniformly mixed with an adhesive and applied to the sheet layers 3 and 4, and the plurality of adsorbents are made into a slurry containing appropriate pulp and a binder and then wetted. It can be formed by a method of making a paper with a paper machine.

The two sheet layers 3 and 4 protect the gas adsorption layer 2. The two sheet layers 3 and 4 are not particularly limited, but have the same shape and size in a plan view, and substantially the entire surfaces are bonded to each other by the adhesive layer 5.

The two sheet layers 3 and 4 have breathability, flexibility and elasticity, for example, woven fabric, knitted fabric, etc.
It can be made of a non-woven fabric, a porous film, or the like. Among them, woven fabrics and knits are preferable from the viewpoint of improving the breathability, flexibility and elasticity of the two sheet layers 3 and 4, and woven fabrics are more preferable from the viewpoint of improving the durability. Knitted fabrics are more preferable from the viewpoint of improving elasticity.

In the case of a woven fabric, the structure thereof may include a single structure such as a plain weave, a twill weave (oblique weave), a satin weave, a layered structure, a hair-attached structure, an entangled structure, etc., but is particularly limited. is not it. Among them, the warp and weft are alternately crossed from the viewpoint of improving the durability and breathability of the two sheet layers 3 and 4 and making the two sheet layers 3 and 4 thinner and lighter. Plain weave woven with is preferable.

In the case of a woven fabric, the density of threads is not particularly limited, but the number of warps per inch (2.54 cm) is preferably 30 or more and 115, and the number of wefts is preferably 40 or more and 80 or less. When the density of the yarn is in the above range, the air permeability, lightness, and flexibility of the two sheet layers 3 and 4 can be improved.

When two sheet layers 3 and 4 are knitted, the organizational structure is a weft knit including a milling knit (rubber knit), a tenjiku knit (flat knit), a pearl knit, a double-sided knit, a waffle knit, etc. The knitted fabric including the Russell edition, the tricot edition, and the like, and the knitted fabric in which these are combined can be mentioned, but the knitting is not particularly limited. Among them, the milling cutter, the tenjiku edition, the tricot edition, and the waffle edition are preferable, and the tenjiku edition and the waffle edition are particularly preferable from the viewpoint of improving the breathability, flexibility, elasticity, and lightness of the two sheet layers 3 and 4. Is preferable.

The thickness of the yarn in the woven fabric or knitted fabric is not particularly limited, but the fineness is preferably 10 dtex or more and 70 dtex or less, and more preferably 18 dtex or more and 56 dtex or less. When the thickness of the thread is within the above range, the durability, breathability, and flexibility of the two sheet layers 3 and 4 can be improved. Further, the yarn may be either a spun yarn or a filament yarn obtained from staples, or may be a mixed yarn in which both are mixed. Further, as the yarn, a single yarn formed by one yarn or a twisted yarn (for example, a twin yarn) formed by twisting two or more single yarns can be used, and the strength of the two sheet layers 3 and 4 can be used. Plyed yarn is preferable from the viewpoint of improving the quality.

The raw material fiber of the thread is not particularly limited, but is natural fiber such as cotton, linen, hair and silk; regenerated cellulose fiber such as rayon, polynosic, cupra and leyocel; semi-synthetic fiber such as acetate fiber and triacetate fiber; nylon 6 Polyamide fiber such as nylon 66 and aramid fiber; polyester fiber such as polyethylene terephthalate fiber, polybutylene terephthalate fiber, polylactic acid fiber and polyarylate; acrylic such as polyacrylonitrile fiber, polyacrylonitrile-vinyl chloride copolymer fiber and modacryl fiber. Fibers; Polyethylene fibers such as polyethylene fibers and polypropylene fibers; Polyvinyl alcohol fibers such as vinylon fibers and polyvinyl alcohol fibers; Polyvinyl chloride fibers such as polyvinyl chloride fibers, vinylidene fibers and polyclar fibers; Synthetic fibers such as polyurethane fibers; Polyphenylene sulfide fiber; heterocyclic polymer fiber such as polybenzazole fiber (PBZ), polyparaphenylene benzobisoxazole (PBO), polybenzoimidazole (PBI) fiber, polyimide fiber; polycarbonate fiber; polysulfone fiber; polyethylene oxide fiber, Polyether-based fibers such as polypropylene oxide fibers can be preferably mentioned. Among them, cotton, polyester fiber, and polyurethane fiber are preferable from the viewpoint of improving the elasticity of the two sheet layers 3 and 4, and cotton is more preferable from the viewpoint of improving the air permeability. A plurality of types of these fibers may be mixed and used. For example, by mixing a polyamide fiber such as nylon 6, nylon 66, or an aramid fiber with a natural fiber such as cotton, the two sheet layers 3 and 4 can be used. The strength can be improved.

The structures and materials of the two sheet layers 3 and 4 may be the same or different from each other. Of the two sheet layers 3 and 4, the outermost layer of the adsorption sheet 1 is preferably excellent in durability, strength and the like, and the innermost layer of the adsorption sheet 1 is preferably excellent in touch and the like. ..

The thicknesses of the two sheet layers 3 and 4 are not particularly limited, but are preferably 0.1 mm or more and 2.0 mm or less, and more preferably 0.2 mm or more and 1.5 mm or less. When the thickness is within the above range, the strength and flexibility of the two sheet layers 3 and 4 can be improved, the weight of the adsorption sheet 1 can be reduced, and the stiffness of the adsorption sheet 1 can be suppressed. Therefore, when the suction sheet 1 is applied to protective clothing, the wearing feeling can be improved. In addition, it is possible to prevent the granular adsorbent from leaking between the two sheet layers 3 and 4.

The basis weight of the two sheet layers 3 and 4 is not particularly limited, but is preferably 20 g / m ² or more and 250 g / m ² or less, and more preferably 40 g / m ² or more and 200 g / m ² or less. When the basis weight is within the above range, the strength and flexibility of the two sheet layers 3 and 4 can be improved, and the weight of the adsorption sheet 1 can be reduced. Therefore, when the suction sheet 1 is applied to protective clothing, the wearing feeling can be improved. In addition, it is possible to prevent the granular adsorbent from leaking between the two sheet layers 3 and 4.

The air permeability of the sheet layers 3 and 4 is not particularly limited, but is preferably 30 cm ³ / cm ² · s or more and 400 cm ³ / cm ² · s or less, and 40 cm ³ / cm ² · s or more and 300 cm ³ / cm ² · s or less. Is even more preferable. When the air permeability is within the above range, the strength and air permeability of the two sheet layers 3 and 4 can be improved. Therefore, when the suction sheet 1 is applied to protective clothing, the wearing feeling can be improved. In addition, it can make it difficult for gaseous substances to pass through the two sheet layers 3,4 and the sheet layers 3,4.

Adhesive layer The adhesive layer 5 has two sheet layers 3 and 4 bonded together due to its adhesiveness, and the gas adsorption layer 2 (a plurality of granular adsorbents) is fixed to the two sheet layers 3 and 4 to form both sheets. It serves to hold between layers 3 and 4.

The adhesive layer 5 is provided so as to cover substantially all of the surfaces of the two sheet layers 3 and 4 facing each other, and the two sheet layers 3 and 4 have substantially the entire surfaces of the two sheet layers 3 and 4 bonded to each other. As a result, the two sheet layers 3 and 4 can be bonded together with a high adhesive force, so that it is possible to effectively prevent the two sheet layers 3 and 4 from peeling off from each other when the adsorption sheet 1 is used or washed. In addition, the gas adsorption layer 2 (a plurality of granular adsorbents) existing between the two sheet layers 3 and 4 can be uniformly and uniformly fixed to the two sheet layers 3 and 4 by the adhesive layer 5. Therefore, it is possible to suppress the desorption of the gas adsorption layer 2 (a plurality of granular adsorbents) from between the two sheet layers 3 and 4. Therefore, even if the adsorption sheet 1 is washed a plurality of times, the gas adsorption layer 2 (a plurality of granular adsorbents) effectively remains on the adsorption sheet 1, so that deterioration of the adsorption performance of the gas adsorption layer 2 is suppressed. The adsorption performance can be maintained.

It should be noted that the "substantially the entire surface (substantially the entire surface)" does not include only that the entire surface (the entire surface) is completely covered with the adhesive layer 5 and the entire surfaces are adhered to each other, but slightly. It means that although there is a part without the adhesive layer 5 in a part of the surface, almost all the other parts are covered with the adhesive layer 5, and most of the surfaces are adhered to each other. For example, there may be a portion where the adhesive layer 5 does not exist on a part or all of the outer peripheral edges of the facing surfaces of the two sheet layers 3 and 4, or a portion where the adhesive layer 5 does not exist even inside the outer peripheral edge is scattered here and there. It also includes cases where there are little by little. That is, for example, discontinuous and partial forms such as striped patterns such as stripes and dot patterns, and partial forms such as lattice patterns and spiral patterns even if they are continuous are excluded from substantially the entire surface.

In the adhesive layer 5, even if the adsorption sheet 1 is repeatedly used, the two sheet layers 3 and 4 are separated from each other, and the gas adsorption layer 2 (a plurality of granular adsorbents) is between the two sheet layers 3 and 4. It is necessary to maintain the adhesive strength so that it does not come off from. In particular, when the adsorption sheet 1 is used for protective clothing or the like, the protective clothing is frequently washed because sweat or the like adheres to the protective clothing when it is worn in contact with the skin of the human body. Therefore, even if the adsorption sheet 1 is washed a plurality of times, the adhesive force of the adhesive layer 5 does not significantly decrease, and the two sheet layers 3 and 4 are peeled off and the adsorption sheet 1 is adsorbed from between the two sheet layers 3 and 4. It is necessary to have washing resistance that can suppress the detachment of the material. In addition, in order to improve the comfort of the user wearing the protective clothing, the suction sheet 1 needs to have flexibility and elasticity. As a result of diligent research by the present inventor, by forming the adhesive layer 5 using an adhesive containing a specific thermoplastic resin as a constituent component (main component), the above-mentioned adsorption sheet 1 has wash resistance and flexibility. It was found that the elasticity was good.

The specific thermoplastic resin is a thermoplastic copolymer resin containing an olefin and a carboxylic acid ester as a copolymerization component. The copolymer resin is a copolymer resin containing an olefin as a hard component and a carboxylic acid ester as a soft component . Since the olefin having excellent mechanical strength contains a carboxylic acid ester having excellent elasticity, it is adhered by forming the adhesive layer 5 with an adhesive containing the copolymer resin as a constituent component (main component). Good flexibility and elasticity can be imparted to the layer 5, and the balance with the mechanical strength can be excellent.

As the olefin which is a copolymerization component , ethylene, propylene and the like can be preferably mentioned.

The carboxylic acid ester which is another copolymerization component is an ester composed of a carboxylic acid and an alcohol, and acetates, acrylic acid esters, methacrylic acid esters and the like can be preferably mentioned. As the acetic acid ester, vinyl acetate and the like can be preferably mentioned. As the acrylic acid ester, methyl acrylate, ethyl acrylate, isobutyl acrylate, isooctyl acrylate and the like can be preferably mentioned. As the methacrylic acid ester, methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, isooctyl methacrylate and the like can be preferably mentioned.

As the above-mentioned copolymer resin, ethylene / vinyl acetate copolymer resin, ethylene / ethyl acrylate copolymer resin, ethylene / ethyl methacrylate copolymer resin and the like can be preferably mentioned, and ethylene / vinyl acetate can be used together. Polymer resins can be particularly preferably mentioned. Among the above-mentioned copolymer resins, the use of ethylene-vinyl acetate copolymer resin reduces the flexibility and elasticity of the two sheet layers 3 and 4 coated on substantially the entire surface of the adhesive layer 5. It can be suppressed, and the flexibility and elasticity of the adsorption sheet 1 can be improved. In addition, it is possible to suppress the decrease in air permeability of the two sheet layers 3 and 4 coated on substantially the entire surface of the adhesive layer 5, and it is possible to improve the air permeability of the adsorption sheet 1.

In the above-mentioned copolymer resin, the total content of the carboxylic acid ester copolymerized with the olefin is not particularly limited, but in the case of the ethylene-vinyl acetate copolymer resin, the content of vinyl acetate is 4. It is preferably 5% by mass or more and 45% by mass or less, more preferably 5% by mass or more and 38% by mass or less, and further preferably 6% by mass or more and 33% by mass or less. The flexibility and elasticity of the adhesive layer 5 can be controlled by the content of vinyl acetate, and the adhesive layer 5 having high flexibility and elasticity can be obtained within the above range.

The vinyl acetate content of the ethylene-vinyl acetate copolymer resin is JIS K6924.
-2: 1997 "Plastic-Ethylene / Vinyl Acetate (E / VAC) Molding and Extrusion Materials-Part 2: How to Make Test Pieces and Obtain Various Properties" Annex "Ethylene-Vinyl Acetate Resin Test Method" Can be measured according to.

The blending ratio of the above-mentioned copolymer resin in the adhesive is not particularly limited, and may be any blending ratio generally used for hot melt adhesives. Further, the adhesive may contain various additives generally used for hot melt adhesives.

The adhesive layer 5 is, for example, a solution-type adhesive in which the above-mentioned copolymer resin is dissolved in an organic solvent, or an aqueous adhesive in which a thermoplastic resin is dispersed or dissolved in water, at least one of the two sheet layers 3 and 4. After applying to substantially the entire surface of the above, the two sheet layers 3 and 4 are bonded to each other and the two sheet layers 3 and 4 are adhered by crimping the two sheet layers 3 and 4 while applying heat with the gas diffusion layer 2 sandwiched between them. The gas adsorption layer 2 can be held between the two. The method for applying the adhesive is not particularly limited, and a conventionally known method can be used.

The amount of the adhesive applied to form the adhesive layer 5 is not particularly limited, but is preferably 4 g / m ² or more and 65 g / m ² or less, and 5 g / m ² or more and 45 g / m ² or less. More preferred. When the amount of the adhesive applied is within the above range, it is possible to form the adhesive layer 5 that exhibits sufficient adhesive strength while reducing the amount of the adhesive used, so that the two sheet layers 3 and 4 can be peeled off or the two can be formed. Desorption of the gas adsorption layer 2 (a plurality of granular adsorbents) from between the sheet layers 3 and 4 can be suppressed. In addition, the cost of the adhesive can be prevented from being wasted, and the application of the adhesive can suppress the deterioration of the breathability, flexibility, and elasticity of the two sheet layers 3 and 4, and the breathability and flexibility of the adsorption sheet 1 can be suppressed. It is possible to improve the property and elasticity.

When a plurality of granular adsorbents are mixed with the adhesive and applied to the sheet layers 3 and 4, the blending amount of the adhesive is not particularly limited, but is 10 mass with respect to 100 parts by mass of the mixture of the adhesive and the adsorbent. The amount is preferably 30 parts by mass or more, and more preferably 15 parts by mass or more and 25 parts by mass or less. When the amount of the adhesive blended is within the above range, the adhesive strength of the two sheet layers 3 and 4, the amount of the adsorbent desorbed from between the two sheet layers 3 and 4, the elasticity of the adsorbent sheet 1, and 2. It is possible to improve the balance between the removal of the adhesive from between the three sheet layers 3 and 4, the adverse effect of the adhesive on the adsorbent (pore blockage), and the like.

The thickness of the adhesive layer 5 is not particularly limited, but is preferably uniform over substantially the entire surface of the two sheet layers 3 and 4. Since the thickness of the adhesive layer 5 is substantially uniform, the stiffness of the sheet layers 3 and 4 of the adsorption sheet 1 can be suppressed, and the presence of the adhesive layer 5 allows the two sheet layers 3 and 4 to be breathable, flexible, and stretchable. It is possible to suppress the partial deterioration of the property, and it is possible to improve the air permeability, flexibility, and elasticity of the adsorption sheet 1 as a whole.

Action / Effect of Adsorption Sheet According to the adsorption sheet 1 of the present embodiment having the above-described configuration, the two sheet layers 3 and 4 are bonded together, and the gas adsorption layer 2 (a plurality of granular adsorptions) is applied to the two sheet layers 3 and 4. The adhesive layer 5 for fixing the material) is provided on substantially the entire surface of the two sheet layers 3 and 4. Therefore, the two sheet layers 3 and 4 are peeled off and the two sheets are more peeled than when the adhesive layer 5 is provided partially and discontinuously with respect to the two sheet layers 3 and 4 having a dot shape or the like. It is possible to suppress the desorption of the gas adsorption layer 2 (a plurality of granular adsorbents) from between the layers 3 and 4. Therefore, even if the adsorption sheet 1 is washed a plurality of times, the adsorption sheet 1 can be prevented from being damaged, and the gas adsorption layer 2 (a plurality of granular adsorbents) effectively remains on the adsorption sheet 1. The adsorption performance can be maintained.

As described above, according to the adsorption sheet 1 of the present embodiment, when it is used for applications such as protective clothing that are frequently washed after use, even if it is washed a plurality of times, it continues to exhibit high adsorption performance and is damaged. Since it has high durability, it has excellent washing resistance and can be used repeatedly for a long period of time such as protective clothing.

In addition, according to the adsorption sheet 1 of the present embodiment, since a specific copolymer resin such as an ethylene-vinyl acetate copolymer resin is used as the thermoplastic resin forming the adhesive layer 5, two sheets are used. Even if the adhesive layer 5 is provided on substantially the entire surface of the layers 3 and 4, it is possible to suppress the decrease in flexibility and elasticity of the two sheet layers 3 and 4, and improve the flexibility and elasticity of the adsorption sheet 1. be able to. Therefore, since the adsorption sheet 1 has high gas impermeable property and also has good flexibility and elasticity, it is possible to improve the wearing feeling when the adsorption sheet 1 is applied to protective clothing or the like.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments because the above-described embodiments are illustrative and not restrictive. The technical scope of the present invention is defined by the scope of claims and includes all modifications within the meaning and scope equivalent to the description of the scope of claims. Various modifications are possible as long as it does not deviate from the purpose.

For example, in the above-described embodiment, the number of the gas adsorption layer 2 is one, and the number of the sheet layers 3 and 4 for protecting the gas adsorption layer 2 is required to be one on both sides of the gas adsorption layer 2. The gas adsorption layer 2 and the sheet layers 3 and 4 can be increased, respectively, for the purpose of improving the mechanical strength of the adsorption sheet 1 or when the amount of gaseous substances to be adsorbed is large.

Further, in the above-described embodiment, various processes can be applied to the two sheet layers 3 and 4. Examples of the processing include hair baking processing, gluing processing, scouring processing, bleaching processing, mercerizing processing, dyeing / soaping processing, water repellent treatment, oil repellent treatment, fireproof processing and the like. It is also possible to carry out a plurality of these processes.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the following Examples.

Test Example 1
<Preparation of adsorption sheet>
In Examples and Comparative Example 1, a granular activated carbon having a BET specific surface area of 950 m ² / g (activated carbon "granular Shirasagi W5C20 / 42" manufactured by Osaka Gas Chemical Co., Ltd.) and 20 weights of the granular activated carbon are used in the gas adsorption layer. A mixture of% granular polyurethane resin (U-240Z manufactured by Tokyo Ink Co., Ltd.) of 125 g / m ² and a thickness of 0.3 mm was used. The toluene adsorption performance of Examples and Comparative Example 1 was 25 g / m ² . For the sheet layer, a polyester plain woven fabric (manufactured by Tokai Thermo Co., Ltd.) having a mass of 30 g / m ² and a thickness of 0.2 mm was used. In the embodiment, an adhesive containing an ethylene-vinyl acetate copolymer resin (EVA resin) as a main component is used, and the adhesive layer is coated by applying an adhesive mixed with a gas adsorption layer on substantially the entire surface of one sheet layer. After that, another sheet layer was overlapped and thermocompression bonded by a heating roller to prepare an adsorption sheet. In Comparative Example 1, an adhesive containing a polyurethane resin as a main component is used, and the adhesive is applied to one sheet layer in a dot shape by a powder dot coating method, and then another sheet layer is interposed between the gas adsorption layers. A suction sheet was produced by thermocompression bonding with a heating roller in the state of being. In both Example and Comparative Example 1, the size of the adsorption sheet was 300 mm in length and 300 mm in width.

<Washing test>
JIS-L-1930 Home washing test method for textile products Washing method for Annex FC type standard washing machine (pulsator type) The washing test was conducted in accordance with Method No. C3M described in the specifications. Washing machine is SHARP
ES-S75 is used, the amount of water is 36L, and the detergent is Kao "Attack Highly Active Bio EX" 0.67g.
It was used at a / L (24.12 g / 36 L) concentration and had a bath ratio of 1:20. The four sides of the suction sheet are fixed with an elastic adhesive, and the four sides are located 25 mm from the edge of a high-density fabric (polyester thread 22dTex, 65 vertical lines / inch, 44 horizontal lines / in, ch mass 45 g / m ² ). , Thickness 0.2 mm) to prevent the activated carbon from falling off from the edge. Furthermore, the adsorption sheet is placed in a bag (length 300 mm or more, width 300 mm or more) made of white spunbonded non-woven fabric (polyester, mass 30 g / m ² ), and the opening of the bag is double-folded and fixed with an elastic adhesive. And it was sealed with a sewing machine. A washing test was carried out in this state.

<Evaluation method of activated carbon shedding property>
With respect to the adsorption sheets of Examples and Comparative Example 1, the amount of activated carbon that came out from between the two sheet layers and adhered to the non-woven fabric (bag) after the washing test was visually confirmed. The results are shown in Table 1. In Table 1, "○" means very few, and "×" means many.

<Evaluation method of peel strength>
For the adsorption sheets of Example and Comparative Example 1, the peel strength at the interface between the two sheet layers before and after the washing test was measured in both the vertical direction and the horizontal direction in accordance with JIS-L-1086. Specifically, five strip-shaped test pieces having a width of 25 mm and a length of 150 mm are collected from the suction sheet in the vertical direction and the horizontal direction, and each test piece is approximately taken from the edge of the short side to the long side. The maximum value of the peel strength shown when the two sheet layers are peeled off in the range of 50 mm, the gripping interval of the test piece is 50 mm using a tensile tester, and the two sheet layers are peeled off by 50 mm at a tensile speed of 100 mm / min is large. The peel strength was obtained by measuring 3 in order from the value and 3 in order from the smallest value and averaging the 6 values. The results are shown in Table 1. In Table 1, "○" indicates that the obtained peel strength exceeds a predetermined threshold for clearing wash resistance, and "×" indicates that the obtained peel strength exceeds a predetermined threshold for clearing wash resistance. Means not.

According to Table 1, since the adhesive layer is coated on substantially the entire surface of the sheet layer, it is possible to prevent the granular activated carbon from desorbing from between the two sheet layers when the granular activated carbon is used for the gas adsorption layer. It was confirmed that it could be done. In addition, it was confirmed that the two sheet layers can be bonded together with high adhesive strength, and that even if the two sheet layers are washed multiple times, the peeling of the two sheet layers can be suppressed.

Test Example 2
<Preparation of adsorption sheet>
As Comparative Examples 2 to 4, adsorption sheets were produced by the same method as in the above-mentioned Examples, except that an adhesive containing polyester resin, polyamide resin, and polyurethane resin as main components was used for coating the adhesive layer.

<Evaluation method of peel strength and texture>
With respect to the adsorption sheets of Examples and Comparative Examples 2 to 4, the peel strength and texture (flexibility, elasticity) were evaluated according to the following criteria by the feel evaluation by five monitors. The results are shown in Table 2. In Table 2, "5" means extremely excellent, "4" means very excellent, "3" means excellent, "2" means inferior, and "1" means very inferior. Here, the evaluation of the adhesive strength is based on the evaluation of the adhesion between the layers of the adsorption sheet before washing on a five-point scale by the feel of the monitor, and the evaluation of the peeling strength is the evaluation of the adhesion between the layers of the adsorption sheet after the washing test described above. The difficulty of peeling was evaluated on a 5-point scale based on the feel of the monitor, and the flexibility and elasticity were evaluated on a 5-point scale based on the feel of the adsorption sheet before washing.

According to Table 2, by coating the adhesive layer with an adhesive containing an ethylene-vinyl acetate copolymer resin, that is, a thermoplastic copolymer resin containing an olefin and a carboxylic acid ester as a copolymer component. It was confirmed that in addition to the adhesive strength and peeling strength of the adsorption sheet, the flexibility and elasticity can be improved.

1 Adsorption sheet 1
2 Gas adsorption layer 3 1st sheet layer 4 2nd sheet 5 Adhesive layer

Claims (7)

A first sheet layer, a second sheet layer whose substantially entire surface is bonded to the first sheet layer by an adhesive layer, and a gas adsorption layer provided between the first sheet layer and the second sheet layer are provided. ,
The gas adsorption layer is composed of a plurality of particulate adsorbents fixed to the first sheet layer and the second sheet layer by the adhesive layer.
The adhesive layer is formed by using an adhesive containing EVA as a constituent, which has a vinyl acetate content of 6% by mass or more and 45% by mass or less .
The first sheet layer and the second sheet layer are adsorption sheets composed of knitted fabrics of tenjiku or waffle . The adsorption sheet according to claim 1, wherein the first sheet layer and the second sheet layer have a basis weight of 20 g / m ² or more and 250 g / m ² or less. The adhesive layer is formed by applying the adhesive to at least one of the first sheet layer and the second sheet layer.
The adsorption sheet according to claim 1 or 2, wherein the amount of the adhesive applied is 4 g / m ² or more and 65 g / m ² or less. The adhesive contains the plurality of granular adsorbents.
The adsorption sheet according to claim 3, wherein the blending amount of the adhesive is 10 parts by mass or more and 30 parts by mass or less with respect to 100 parts by mass of the mixture of the adhesive and the plurality of granular adsorbents. The adsorption sheet according to any one of claims 1 to 4, wherein the thickness of the first sheet layer and the second sheet layer is 0.1 mm or more and 2.0 mm or less. The adsorption sheet according to any one of claims 1 to 5, wherein the content of vinyl acetate in EVA is 6% by mass or more and 33% by mass or less. Protective clothing using the adsorption sheet according to any one of claims 1 to 6 .

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