Adsorption sheet, step-formed sheet, step-formed laminate, adsorption element, and dehumidifier

Abstract

The present invention provides: an adsorption sheet that has excellent dehumidification performance, is capable of reducing heat load due to the ease of moisture desorption, and has excellent energy efficiency; and a step-formed sheet, a step-formed laminate, an adsorption element, and dehumidifier in all of which the adsorption sheet is used　The present invention is an adsorption sheet comprising a porous metal complex and / or silica gel, and fibers that can contain water, and is characterized in that the difference (A-B) between the wavenumber A of a peak top in a wavenumber range of 3000-3700 cm-1 in a dry state and the wavenumber B of a peak top in a wavenumber range of 3000-3700 cm-1 in a moisture-adsorbed state is 8.5-34 cm-1 as measured by infrared spectroscopy.<sp / >

Description

Adsorption sheet, corrugated sheet, corrugated laminate, adsorption element, and dehumidifier

[0001] The present disclosure relates to an adsorbent sheet capable of adsorbing moisture contained in air to be treated, a corrugated sheet using the adsorbent sheet, a corrugated laminate, an adsorption element, and a dehumidifier.

[0002] Adsorbent sheets are sheets containing porous materials such as silica gel and zeolite. A known method for manufacturing adsorbent sheets is, for example, a wet papermaking process, in which a porous material, fiber, and an organic binder are mixed together to form a sheet. Adsorbent elements are manufactured by forming one or more adsorbent sheets into a predetermined shape or structure. For example, a corrugated adsorbent sheet is laminated onto a liner-shaped adsorbent sheet using an adhesive to form a corrugated sheet, which is then stacked or wound into a rotor to form a corrugated laminate. The outer periphery of the corrugated laminate is then coated with a metal film to produce a honeycomb-structured adsorbent element. Adsorbent elements are installed in the flow path of the air to be treated in dehumidifiers. Dehumidifiers dehumidify the air to be treated by bringing the air to be treated into contact with the adsorbent element, causing the moisture contained in the air to be adsorbed by the porous material in the adsorbent element.

[0003] Silica gel is generally used as the adsorbent carried in the adsorption element, and Patent Document 1 proposes a dehumidifying member using silica gel (see Patent Document 1).

[0004] However, in the dehumidifying member described in Patent Document 1, the moisture desorption performance of silica gel is not considered.

[0005] While silica gel can efficiently adsorb moisture into its pores due to its porous structure, its strong adsorption power for adsorbed moisture results in a slow desorption rate. For this reason, dehumidifiers must ensure a large regeneration zone for the adsorption element, which reduces the area of ​​the adsorption zone and reduces dehumidification performance. Furthermore, the large thermal load required to desorb moisture adsorbed by silica gel results in poor energy efficiency.

[0006] Therefore, there is a need for the development of an adsorption sheet that has excellent dehumidifying performance, reduces thermal load due to easy moisture desorption, and is energy efficient, as well as a corrugated sheet, corrugated laminate, adsorption element, and dehumidifier that use the same.

[0007] Japanese Patent Application Laid-Open No. 2021-181072

[0008] The present disclosure aims to provide an adsorption sheet that has excellent dehumidifying performance, reduces thermal load due to easy moisture desorption, and is energy efficient, as well as a corrugated sheet, corrugated laminate, adsorption element, and dehumidifier that use the same.

[0009] As a result of extensive research, the present inventors have found that the above object can be achieved when an adsorbent sheet comprising a porous metal complex and / or silica gel, and a hydrated fiber has a peak top wavenumber difference within a specific range of wavenumbers in a dry state and a hydrated state measured by infrared spectroscopy, which is within a specific range, and have thus completed the present invention.

[0010] That is, the present invention relates to the following adsorbent sheet, corrugated sheet, corrugated laminate, adsorbent element, and dehumidifier: 1. An adsorbent sheet comprising a porous metal complex and / or silica gel and a water-absorbable fiber, which has a wave number of 3000 to 3700 cm in a dry state as measured by infrared spectroscopy. －１ and the wavenumber A of the peak top in the range of 3000 to 3700 cm in the humidified state. －１ The difference between the wavenumber B and the peak top in the range (A-B) is 8.5 cm －１ 34cm or more －１2. An adsorbent sheet according to item 1, containing 40 to 85 mass % of the porous metal complex and / or silica gel. 3. An adsorbent sheet according to item 1 or 2, wherein the moisture-absorbable fibers include fibrillated fibers. 4. A corrugated sheet formed by laminating two adsorbent sheets according to any one of items 1 to 3, wherein a flat adsorbent sheet and a corrugated adsorbent sheet are laminated together, and the corrugated sheet has cells through which air passes. 5. A corrugated laminate formed by laminating two corrugated sheets according to item 4. 6. The number of cells per area of ​​the surface through which air passes (cells / cm ２ ) is 80 pieces / cm ２ More than 135 pieces / cm ２ Item 5. The stepped laminate according to Item 5, wherein the following is true: 7. An adsorption element comprising the stepped laminate according to Item 5 or 6. 8. An adsorption element comprising a porous metal complex and / or silica gel, and a water-absorbable fiber, wherein the adsorption element has a wave number of 3000 to 3700 cm in a dry state as measured by infrared spectroscopy. －１ and the wavenumber A of the peak top in the range of 3000 to 3700 cm in the humidified state. －１ The difference between the wavenumber B and the peak top in the range (A-B) is 8.5 cm －１ 34cm or more －１ 9. A dehumidifier having an adsorption element according to item 7 or 8, the dehumidifier including a rotor that rotates around a rotation axis, the rotor having an adsorption zone and a regeneration zone along a circumferential direction that is a rotation direction, the dehumidifier comprising: an adsorption zone air supply passage that supplies air to be treated to the adsorption zone and causes the rotor to adsorb moisture in the air to be treated, and a regeneration zone air supply passage that supplies regeneration air to the regeneration zone and causes the rotor to desorb moisture that has adsorbed moisture.

[0011] The adsorbent sheet of the present disclosure has excellent dehumidifying performance and can reduce thermal load due to easy moisture desorption. Therefore, the adsorbent sheet of the present disclosure has excellent energy efficiency. Furthermore, a corrugated sheet, a corrugated laminate, and a dehumidifier using an adsorbent element of the present disclosure have excellent dehumidifying performance and can reduce thermal load due to easy moisture desorption, thereby demonstrating excellent energy efficiency.

[0012] Fig. 1(A) is a perspective view of a liner-shaped adsorption sheet, Fig. 1(B) is a perspective view of a corrugated adsorption sheet, and Fig. 1(C) is a cross-sectional schematic diagram of a corrugated sheet formed by laminating a corrugated adsorption sheet on a liner-shaped adsorption sheet. Fig. 2(A) is a perspective view showing a procedure for forming an adsorption element, and Fig. 2(B) is a perspective view of the adsorption element. Fig. 2(B) is a schematic diagram of a dehumidifier.

[0013] The adsorption sheet, corrugated sheet, corrugated laminate, adsorption element, and dehumidifier of the present disclosure will be described in detail below.

[0014] The following description of the components may be based on representative embodiments and specific examples, but the present disclosure is not limited to such embodiments.

[0015] In the numerical ranges described in stages in this specification, the upper or lower limit of a certain numerical range can be arbitrarily combined with the upper or lower limit of another numerical range. Furthermore, in the numerical ranges described in this specification, the upper or lower limit of the numerical range may be replaced with a value shown in an example or a value that can be unambiguously derived from an example. Furthermore, in this specification, a numerical value connected with "to" means a numerical range that includes the numbers before and after "to" as the upper and lower limits.

[0016] In this specification, the expressions "contain" and "comprise" include the concepts of "contain," "include," "substantially consist," and "consist only of." Furthermore, the expression "consist" includes the concepts of "contain," "include," "substantially consist," and "consist only of."

[0017] In this specification, "A and / or B" means either one of A and B, or both A and B.

[0018] 1. Adsorption Sheet The adsorption sheet of the present disclosure is an adsorption sheet made of a porous metal complex and / or silica gel, and a water-absorbable fiber, and has a wave number of 3000 to 3700 cm in a dry state as measured by infrared spectroscopy. －１ and the wavenumber A of the peak top in the range of 3000 to 3700 cm in the humidified state. －１ The difference between the wavenumber B and the peak top in the range (A-B) is 8.5 cm －１ 34cm or more －１ The present invention is characterized by the following:

[0019] The adsorbent sheet of the present disclosure having the above-mentioned characteristics contains a porous metal complex and / or silica gel and water-absorbable fibers, and can exhibit excellent dehumidifying performance.

[0020] In addition, the adsorbent sheet of the present disclosure has a difference (A-B) between the wave number A of the peak top in a dry state and the wave number B of the peak top in a hygroscopic state in the above wave number range measured by infrared spectroscopy of 8.5 cm －１ 34cm or more －１ In infrared spectroscopy, the wave number is 3000 to 3700 cm －１ In the range, peaks mainly due to OH and NH are observed. In a dry adsorbent sheet, peak tops due to the adsorbent and the skeleton of the hygroscopic fiber are observed, but in a wet adsorbent sheet, differences in peak tops from the dry state occur due to the influence of bulk water adsorbed on the adsorbent, water molecules hydrogen-bonded to the porous metal complex and / or silica gel adsorbent, and water molecules hydrogen-bonded to the hygroscopic fiber. In the present disclosure, it has been found that the difference in peak tops between the dry and wet states in the above wavenumber range measured by infrared spectroscopy affects dehumidification performance and ease of moisture desorption.

[0021] The adsorbent sheet of the present disclosure has a difference (A-B) between the wave number A of the peak top in a dry state and the wave number B of the peak top in a humidified state in the above wave number range measured by infrared spectroscopy of 8.5 cm －１Since the difference (A - B) is 34 cm, the adsorbent sheet of the present disclosure can exhibit a sufficient amount of moisture adsorption as an adsorbent sheet used in a dehumidifier. －１ Since the adsorption force for moisture is reduced, the desorption rate for moisture desorption is fast. Therefore, in a dehumidifier using the adsorbent sheet of the present disclosure, the area of ​​the regeneration zone of the adsorption element can be reduced, and the area of ​​the adsorption zone can be increased accordingly, thereby exhibiting high dehumidification performance. Furthermore, a dehumidifier using the adsorbent sheet of the present disclosure can reduce the thermal load required to desorb moisture adsorbed by the silica gel, thereby exhibiting high energy efficiency. In other words, the adsorbent sheet of the present disclosure, and the corrugated sheet, corrugated laminate, adsorbent element, and dehumidifier using the adsorbent sheet, as well as the corrugated sheet, corrugated laminate, adsorbent element, and dehumidifier using the same, have excellent dehumidification performance and can easily desorb moisture, thereby reducing the thermal load and exhibiting excellent energy efficiency.

[0022] The difference in wavenumber (A-B) of the peak top of the adsorption sheet of the present disclosure is 8.5 cm －１ 34cm or more －１ The difference in wave numbers (A-B) is 8.5 cm or less. －１ If the difference in wavenumber (A-B) is less than 34 cm, the amount of bulk water adsorbed will decrease, and the dehumidifying performance will decrease. －１ If the difference in wavenumber (A-B) is more than 9 cm, the dehumidifying performance will decrease and the heat load for desorption of moisture will increase. －１ More than 9.5 cm is preferable. －１ The upper limit of the wave number difference (A-B) is 32 cm －１ Preferably less than 30 cm －１ Less than 25cm is more preferable. －１ More preferably, 20 cm or less －１ The following are particularly preferred:

[0023] In this specification, the difference (A−B) in wave numbers of the peak tops of the adsorption sheet is measured by the following measurement method.

[0024] [Method for measuring the wavenumber difference (A-B) of the peak top] The absorbance of the adsorbent sheet is measured using an infrared spectrophotometer (FTIR) (product name: Cary 670 (manufactured by Agilent) or Golden Gate heated diamond ATR (manufactured by Specac)) under the following conditions by the ATR method.

[0025] (Measurement conditions) Measurement area: 2 mm x 2 mm Measurement wavelength range: 500 cm －１ ~4000cm －１ Number of integration: 128 times Resolution: 4cm －１

[0026] (Drying Atmospheric Conditions) The absorbance is measured while maintaining a drying state in an air atmosphere at a temperature of 150° C. for 10 minutes or more.

[0027] (Wet Atmospheric Conditions) The absorbance is measured while the sample is left standing in an air atmosphere at a temperature of 25° C. and a humidity of 50% RH for 10 minutes or more.

[0028] Spectra obtained in dry and wet conditions, wavenumbers 3000-3700 cm －１ The wave number at which the peak intensity reaches its maximum value between these values ​​is defined as the "peak top wave number." The wave number at the peak top in a dry state is defined as A (cm －１ ), the wave number of the peak top in the wet state is B (cm －１ ) and the difference A-B (cm －１ ) is calculated and used as the measured value.

[0029] Hereinafter, each of the constituent elements of the suction sheet of the present disclosure will be described in detail.

[0030] <Porous Metal Complex and / or Silica Gel> The porous metal complex and / or silica gel (hereinafter, these are also collectively referred to as "porous material") is not particularly limited as long as it has the ability to adsorb moisture, which is the substance to be adsorbed, and can be appropriately selected from known materials depending on the substance to be adsorbed.

[0031] Preferred examples of silica gel include type A silica gel and type B silica gel. From the viewpoint of improving moisture adsorption performance, type A silica gel with a small average pore size or type RD silica gel with physical properties similar to type A silica gel is preferred. On the other hand, from the viewpoint of improving moisture desorption performance, type B silica gel with a large average pore size is preferred. In order to achieve both adsorption performance and desorption performance, type A silica gel or type RD silica gel and type B silica gel may be mixed in any ratio depending on the desired performance.

[0032] A porous metal complex (PCP) is a porous material formed by self-assembly of metal ions, which can take various coordination forms, and organic ligands with two or more coordination sites. A framework structure is constructed by bridging the metal ions that serve as nodes with the organic ligands, and the pores within this framework act as spaces for capturing the target substance. A metal-organic framework (MOF) can be suitably used as the porous metal complex.

[0033] Compared to inorganic porous materials such as silica gel and zeolite, porous metal complexes have features such as a high specific surface area, a sharp pore distribution, and high structural designability, which offer the advantages of a fast adsorption rate for moisture (the target substance) and a large amount of the target substance that can be adsorbed. Furthermore, because the target substance is adsorbed and desorbed using weak bonding forces such as coordination interactions and hydrogen bonds, the heat of adsorption generated during adsorption is small, and the adsorbed target substance can be desorbed even at low regeneration gas temperatures, resulting in low energy requirements for regeneration. Therefore, by using porous metal complexes as the porous material, the adsorption sheet can effectively adsorb the target substance in the target gas (the air to be treated).

[0034] The metal ions constituting the porous metal complex are not particularly limited, and examples thereof include titanium ions, manganese ions, iron ions, cobalt ions, nickel ions, copper ions, zinc ions, aluminum ions, zirconium ions, etc. Among these, titanium ions, iron ions, manganese ions, copper ions, zinc ions, aluminum ions, and zirconium ions, which have low toxicity in consideration of environmental pollution, are preferred examples of the metal ions.

[0035] The compound having an organic ligand is not particularly limited, and examples thereof include dicarboxylic acids such as terephthalic acid, isophthalic acid, 2-aminoterephthalic acid, 2,5-diaminoterephthalic acid, 2,5-dihydroxyterephthalic acid, 1,4-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 4,4'-biphenyldicarboxylic acid, 3,3'-biphenyldicarboxylic acid, fumaric acid, 1H-pyrazole-3,5-dicarboxylic acid, and 2,5-furandicarboxylic acid; tricarboxylic acids such as trimesic acid; tetracarboxylic acids such as azobenzene-3,3'-5,5'-tetracarboxylic acid; and imidazoles such as 2-methylimidazole.

[0036] Specific examples of porous metal complexes include: a porous metal complex (MOF303) composed of aluminum ions and 1H-pyrazole-3,5-dicarboxylic acid; a porous metal complex (MIL160) composed of aluminum ions and 2,5-furandicarboxylic acid; a porous metal complex (PCN250) composed of iron ions and azobenzene-3,3'-5,5'-tetracarboxylic acid; a porous metal complex (MIL100) composed of iron ions and trimesic acid; porous metal complexes (MIL53, MIL101) composed of iron ions and terephthalic acid; a porous metal complex (MOF801) composed of zirconium ions and fumaric acid (UiO66); a porous metal complex (UiO66-NH) composed of zirconium ions and 2-aminoterephthalic acid ２), a porous metal complex (MIL125) composed of titanium ions and terephthalic acid, and a porous metal complex (MIL125-NH) composed of titanium ions and 2-aminoterephthalic acid. ２ ), a porous metal complex composed of nickel and 2,5-dihydroterephthalic acid (MOF74-Ni), a porous metal complex composed of magnesium and 2,5-dihydroterephthalic acid (MOF74-Mg), a porous metal complex composed of chromium and terephthalic acid (MIL101), etc. These porous metal complexes vary in BET specific surface area depending on the synthesis method and purity, even if they are the same porous metal complex.

[0037] The porous material may be in various forms, such as powder, granules, fibers, etc. The adsorption sheet contains a large number of powder or granular porous materials.

[0038] The size of the porous material is not particularly limited, but is preferably 0.1 μm or more, more preferably 0.5 μm or more, and more preferably 1 μm or more. On the other hand, the size of the porous material is not particularly limited, but is preferably 200 μm or less, more preferably 150 μm or less, more preferably 100 μm or less, and more preferably 80 μm or less. When the size of the porous material is 0.1 μm or more and 200 μm or less, the gas to be treated can be brought into good contact with the porous material, thereby improving the adsorption performance of the porous material. Furthermore, the pressure loss when the gas to be treated comes into contact with the porous material can be reduced. Furthermore, the porous material can be supported on the adsorption sheet at a high density, while the detachment of the porous material from the adsorption sheet can be reduced. The size of the porous material can be measured by the D50 value of a laser diffraction particle size analyzer or the average particle diameter using a scanning electron microscope.

[0039] The pore structure of the porous material is not particularly limited. When the porous material is a porous metal complex, the pore structure of the porous metal complex may be one-dimensional pores or three-dimensional pores. From the viewpoint of a high adsorption rate of the substance to be adsorbed and ease of adsorption of the substance to be adsorbed, the pores of the porous metal complex are preferably one-dimensional pores. Specific examples of porous metal complexes having one-dimensional pores include PCN250, MOF303, MOF74, etc. In addition, when the porous metal complex has three-dimensional pores but does not have open metal sites, it is preferable that the crystallite size of the porous metal complex is small so that the moisture, which is the substance to be adsorbed, can be easily adsorbed all the way to the inside of the pores. Specific examples of porous metal complexes having three-dimensional pores and no open metal sites include MOF801, etc.

[0040] The pore size of the porous material is not particularly limited. Since the porous metal complex, which is a porous material, has improved adsorption performance for moisture, a target substance for adsorption, because moisture is a polar substance with a relatively small size, the pore size of the porous metal complex is not particularly limited, but is preferably 3.0 Å or more, more preferably 3.5 Å or more. On the other hand, the pore size of the porous metal complex is not particularly limited, but is preferably 10 Å or less, more preferably 8 Å or less. When the pore size of the porous metal complex is 3.0 Å or more and 10 Å or less, the target substance for adsorption can be well adsorbed into the pores, improving the adsorption performance of the porous metal complex. Furthermore, when the porous metal complex is regenerated, the adsorbed target substance can be easily desorbed from the porous metal complex. When prioritizing the improvement of the adsorption performance of the porous metal complex by increasing the desorption rate of the porous metal complex, the pore size of the porous metal complex is preferably greater than 10 Å. The pore size of the porous metal complex can be obtained by measuring the cage diameter or window diameter of the pores by X-ray structural analysis.

[0041] When the porous material is silica gel, the pore size of the silica gel is not particularly limited, but from the viewpoint of improving the adsorption performance for moisture, which is the substance to be adsorbed, an average pore size of 30 Å or less is preferable. On the other hand, from the viewpoint of improving the desorption performance for the substance to be adsorbed, the pore size of the silica gel is not particularly limited, but an average pore size of 70 Å or less is preferable. In order to achieve both adsorption performance and desorption performance, multiple types of silica gel having average pore sizes in the range of 10 Å to 70 Å may be mixed and used in any ratio depending on the desired performance.

[0042] The specific surface area of ​​the porous material measured by the BET method (BET specific surface area) is not particularly limited. When the porous material is a porous metal complex, the specific surface area of ​​the porous metal complex measured by the BET method (BET specific surface area) is not particularly limited, but is preferably 200 m ２ / g or more, more preferably 300m ２ / g or more, more preferably 500m ２ / g or more, more preferably 900m ２ / g or more, more preferably 1000m ２ / g or more, more preferably 1500m ２ / g or more, more preferably 1800m ２ The BET specific surface area of ​​the porous metal complex is not particularly limited, but is preferably 6000 m ２ / g or less, and more preferably 2500m ２ / g or less, and more preferably 2000m ２ / g or less. The specific surface area of ​​the porous metal complex is 200 m ２ / g or more 6000m ２ When the specific surface area of ​​the porous metal complex is 2500 m / g or less, the substance to be adsorbed can be well adsorbed into the pores, and the adsorption performance of the porous metal complex can be improved. In addition, the porous metal complex can be easily produced. ２ When the pore size is 1 / g or less, the strength of the porous metal complex can be sufficiently ensured.

[0043] When the porous material is silica gel, the specific surface area of ​​the silica gel measured by the BET method is not particularly limited, but is preferably 200 m２ / g or more, more preferably 300m ２ / g or more, more preferably 400m ２ / g or more.

[0044] The bulk density of the porous material is not particularly limited, but is preferably 0.2 g / cc or more, more preferably 0.23 g / cc or more. When the bulk density of the porous material is 0.2 g / cc or more, the voids between the multiple porous materials can be reduced, and the porous materials can be supported on the adsorption sheet at a high density. Therefore, the adsorption sheet can effectively adsorb the target substances in the air to be treated. The bulk density of the porous material can be measured by dividing the volume of a container of known volume by the weight of the porous material when the porous material is filled to the brim.

[0045] The content of the porous material in the adsorption sheet is not particularly limited, but is preferably 40% by mass or more, more preferably 50% by mass or more. On the other hand, the content of the porous material is not particularly limited, but is preferably 85% by mass or less, more preferably 83% by mass or less. When the content of the porous material is 40% by mass or more and 85% by mass or less, the adsorption sheet can carry a high content of the porous material, so that the adsorption sheet can effectively adsorb the target substance in the gas to be treated, while reducing the detachment of the porous material from the adsorption sheet and ensuring sufficient strength of the adsorption sheet.

[0046] The porous material may contain one or more of the above-mentioned silica gels and porous metal complexes. The porous material may also contain porous materials other than the above-mentioned silica gels and porous metal complexes, such as activated carbon, activated alumina, zeolite, aluminophosphates, silicoaluminophosphates, and organic polymer porous materials such as styrene-divinylbenzene copolymers.

[0047] <Fibers> The fibers constituting the adsorption sheet are water-absorbent fibers. There are no particular limitations on the type of fibers as long as they are water-absorbent, and fibers having hydrophilic functional groups can be used.

[0048] Examples of hydrophilic functional groups include a hydroxyl group, a carbonyl group, a carboxyl group, an amino group, an amide group, a phenol group, a silanol group, a sulfonic acid group, a phosphate group, and a nitrate group.

[0049] Specific examples of fibers capable of absorbing water include natural fibers, synthetic fibers, regenerated fibers, semi-synthetic fibers, and inorganic fibers. Specific examples of natural fibers include cotton, hemp, and pulp. Specific examples of synthetic fibers include aramid fibers, meta-aramid fibers, polybenzimidazole fibers, polybenzoxazole fibers, polyimide fibers, polyamideimide fibers, polyether ketone fibers, polyethylene terephthalate fibers, nylon fibers, and phenolic resin fibers. Specific examples of regenerated fibers include rayon, polynosic, and cupra. Specific examples of semi-synthetic fibers include acetate fibers and triacetate fibers. Specific examples of inorganic fibers include glass fibers, ceramic fibers, ceramic wool fibers, and rock wool fibers. The fibers constituting the adsorption sheet may be a combination of two or more of the above-mentioned fibers. The fibers capable of absorbing water may also be fibers produced by oxidizing the above-mentioned natural fibers, synthetic fibers, regenerated fibers, semi-synthetic fibers, and inorganic fibers.

[0050] The fibers constituting the adsorbent sheet can contain both non-fibrillated fibers and fibrillated fibers. The inclusion of non-fibrillated fibers in the adsorbent sheet allows the adsorbent sheet to maintain a corrugated shape, for example, when the adsorbent sheet is corrugated. On the other hand, the inclusion of fibrillated fibers in the adsorbent sheet allows the adsorbent sheet to efficiently support the porous material, and also allows for a reduction in the amount of organic binder contained in the adsorbent sheet to fix the porous material to the adsorbent sheet. This prevents the organic binder from blocking the pores of the porous material, thereby improving the adsorption performance of the porous material. The adsorbent sheet of the present disclosure preferably contains fibrillated fibers.

[0051] The fiber diameter of the non-fibrillated fibers is not particularly limited, but is preferably 5 μm or more and 30 μm or less. The fiber length of the non-fibrillated fibers is not particularly limited, but is preferably 1 mm or more, more preferably 2 mm or more. On the other hand, the fiber length of the non-fibrillated fibers is not particularly limited, but is preferably 10 mm or less, more preferably 8 mm or less. When the non-fibrillated fibers have a fiber diameter of 5 μm or more and a fiber length of 1 mm or more, the strength of the adsorbent sheet can be sufficiently ensured, and when the adsorbent sheet is subjected to, for example, a corrugated processing, the adsorbent sheet can maintain its corrugated shape. When the non-fibrillated fibers have a fiber diameter of 30 μm or less and a fiber length of 10 mm or less, the adsorbent sheet has appropriate flexibility, and can easily be subjected to, for example, a corrugated processing. The non-fibrillated fibers may be a mixture of fibers with different fiber diameters and fiber lengths.

[0052] The fibrillated fibers are, for example, fibers obtained by fibrillating the non-fibrillated fibers described above. The fibrillation method is not particularly limited, and any conventionally known method can be used, such as a beating method using a beating machine such as a beater or a refiner.

[0053] The fibrillated fibers are not particularly limited, but when the Canadian Standard Freeness (CSF) is measured in accordance with JIS P 8121-2, the value is preferably 50 ml or more and less than 800 ml.

[0054] The total content of non-fibrillated fibers and fibrillated fibers in the adsorbent sheet is not particularly limited, but is preferably 5% by mass or more, more preferably 10% by mass or more. On the other hand, the total content of non-fibrillated fibers and fibrillated fibers in the adsorbent sheet is not particularly limited, but is preferably 25% by mass or less. When the total content of non-fibrillated fibers and fibrillated fibers in the adsorbent sheet is 5% by mass or more and 25% by mass or less, it is possible to support a sufficient amount of porous material in the adsorbent sheet, while reducing the detachment of porous metal complexes from the adsorbent sheet. In addition, the strength of the adsorbent sheet can be sufficiently ensured.

[0055] The content of water-absorbable fibers in the adsorbent sheet is not particularly limited, but is preferably 5% by mass or more, more preferably 10% by mass or more. On the other hand, the content of water-absorbable fibers in the adsorbent sheet is not particularly limited, but is preferably 25% by mass or less. When the content of water-absorbable fibers in the adsorbent sheet is 5% by mass or more and 25% by mass or less, it is possible to support a sufficient amount of porous material on the adsorbent sheet while reducing the detachment of the porous metal complex from the adsorbent sheet. Furthermore, the strength of the adsorbent sheet can be sufficiently ensured.

[0056] <Organic Binder> The adsorption sheet may contain an organic binder. The organic binder contained in the adsorption sheet is not particularly limited as long as it can fix the porous material to the adsorption sheet. Examples of the organic binder that can be used include polyvinyl alcohol-based polymers, polyacrylonitrile-based polymers, polyethylene-based polymers, polyester-based polymers, and polyphenylene ether-based polymers. A preferred example of the organic binder is a polyvinyl alcohol-based polymer from the viewpoint of ease of handling.

[0057] The form of the organic binder is not particularly limited, but it is preferable to use a fibrous organic binder, since this allows the adsorption sheet to be easily produced.

[0058] The content of the organic binder in the adsorption sheet is not particularly limited, but is preferably 3% by mass or more, more preferably 4% by mass or more. On the other hand, the content of the organic binder in the adsorption sheet is not particularly limited, but is preferably 15% by mass or less, more preferably 12% by mass or less. When the content of the organic binder in the adsorption sheet is 3% by mass or more and 15% by mass or less, the supportability and flexibility of the porous material in the adsorption sheet can be sufficiently ensured. Furthermore, the rate at which side chains of the organic binder are adsorbed into the pores of the porous material and block the pores can be reduced, thereby improving the adsorption performance of the porous material.

[0059] The organic binder functions to improve the flexibility of the adsorbent sheet, but even if the organic binder content in the adsorbent sheet is low, the adsorbent sheet can exhibit good support for the porous material by containing fibrillated fibers, and the high moisture adsorption rate of the porous material allows the adsorbent sheet to exhibit flexibility. This not only allows the organic binder content in the adsorbent sheet to be reduced, but also, as a result of being able to reduce the organic binder content, it is possible to prevent the organic binder from clogging the pores of the porous material, thereby improving the adsorption performance of the porous material.

[0060] The water dissolution temperature of the organic binder is not particularly limited, but is preferably 65°C or higher, more preferably 70°C or higher. On the other hand, the water dissolution temperature of the organic binder is not particularly limited, but is preferably 100°C or lower. When the water dissolution temperature of the organic binder is 65°C or higher and 100°C or lower, the proportion of side chains of the organic binder adsorbing into the pores of the porous material and blocking the pores can be reduced, and the adsorption performance of the porous material can be improved. Furthermore, the adhesive strength of the organic binder can be well exhibited, and the organic binder can effectively support the porous material on the adsorption sheet.

[0061] The dissolution temperature of the organic binder in water can be measured by a conventionally known method. For example, 100 ml of pure water is placed in a beaker, stirred, and heated in an oil bath until the water temperature reaches 50° C. 0.5 g of organic binder is added to the heated water, the temperature is increased at a rate of 2° C. / min, and the temperature is measured when the organic binder begins to dissolve and becomes translucent by visual observation.

[0062] <Method for Producing Adsorbent Sheet> The method for producing an adsorbent sheet is not particularly limited, but a preferred example is a wet papermaking method. When producing an adsorbent sheet by a wet papermaking method, first, a porous material such as a porous metal complex and / or silica gel, fibers, and an organic binder are dispersed and mixed in a solvent such as water or an organic solvent at a predetermined blending ratio (preparation of a dispersion slurry). Next, the obtained dispersion slurry is made into a sheet using a papermaking machine to obtain a sheet-like material (sheeting process). The obtained sheet-like material is then dehydrated and dried to obtain an adsorbent sheet (dehydration and drying process). The dehydration and drying methods are not particularly limited, and conventionally known methods can be used. Examples of dehydration methods include a method of pressurized dehydration by passing a sheet-like material between a pair of rolls, and a method of pulling an adsorbent sheet onto a net and removing moisture under its own weight. Examples of drying methods include sun drying and a method of blowing hot air onto the dehydrated sheet-like material.

[0063] In the sheet-forming process, it is preferable to mix the porous material with other materials while solvent molecules have penetrated into the pores of the porous material. If the porous material does not have solvent molecules in its pores, the organic binder that constitutes the adsorption sheet may be trapped in the pores. In this case, it is difficult to remove the organic binder trapped in the pores of the porous material after sheet formation, which may result in a decrease in the adsorption performance of the adsorption sheet. In contrast, by trapping solvent molecules in the pores of the porous material, the organic binder is prevented from penetrating and being trapped in the pores of the porous material during the sheet-forming process. After the sheet-forming process, the solvent molecules are removed from the pores by a desolvation treatment described below, thereby ensuring the adsorption performance of the adsorption sheet.

[0064] When producing the adsorption sheet, a polymer flocculant may be added as an additive in addition to the raw materials of the porous material, fibers and organic binder, and the water repellent agent.

[0065] <Shape and properties of adsorbent sheet> The adsorbent sheet can be used in a liner-like (flat) form as shown in Figure 1 (A), but can also be used in a desired shape by appropriately applying pleating, honeycomb processing, corrugation, or the like. When processing the adsorbent sheet into a pleated, honeycomb, corrugated, or other shape, flexibility may be imparted to the adsorbent sheet by allowing the porous material to absorb sufficient moisture so that the adsorbent sheet can be easily folded. Alternatively, the adsorbent sheet may be processed in a semi-dry state where it is completely dried, and then completely dried after processing.

[0066] The flexibility of the adsorbent sheet is not particularly limited, but is preferably 5% m / g or more, where the tensile elongation index is used as an indicator of flexibility. If the tensile elongation index of the adsorbent sheet is 5% m / g or more, the adsorbent sheet has good processability, and when the adsorbent sheet is used to manufacture an adsorbent element having a honeycomb structure, for example, cracks can be suppressed from occurring in the adsorbent sheet even if the adsorbent sheet is corrugated.

[0067] The tensile elongation index of the adsorption sheet is determined by drying a 15 mm x 100 mm sample piece cut from the adsorption sheet at 120°C for 1 hour and measuring its weight. The dried sample piece is then left to stand in an atmosphere of 25°C and 75% RH for 1 hour, and the maximum point elongation [%] is measured using a tensile / compression testing machine (TENSILON RTG-1310, manufactured by A&D). The chuck distance is 50 mm and the tensile speed is 15 mm / min. From the obtained data, the tensile elongation index [% m / g] is calculated using the following formula 2.

[0068] Specific tensile elongation = Maximum point elongation [%] / Sample width [m] / Basis weight of adsorption sheet [g / m ２ ]...(Formula 2)

[0069] The thickness of the adsorption sheet is not particularly limited, but is preferably 0.1 mm or more. On the other hand, the thickness of the adsorption sheet is preferably 0.9 mm or less, more preferably 0.7 mm or less. If the thickness of the adsorption sheet is 0.1 mm or more and 0.9 mm or less, the strength of the adsorption sheet can be sufficiently ensured when the adsorption sheet is processed to manufacture an adsorption element, and an increase in pressure loss in the adsorption element manufactured by processing the adsorption sheet can be suppressed.

[0070] The basis weight of the adsorption sheet is not particularly limited, but is preferably 25 g / m ２ More preferably, 40 g / m ２ On the other hand, the basis weight of the adsorption sheet is preferably 200 g / m ２ and preferably 150 g / m ２ The basis weight of the adsorption sheet is 25 g / m ２ More than 200g / m ２ If this is the case, the thickness of the adsorption sheet can be ensured and a decrease in strength can be suppressed, making it easier to process the adsorption sheet to manufacture an adsorption element, and since the thickness of the adsorption sheet can be prevented from becoming too large, an increase in pressure loss in the adsorption element manufactured by processing the adsorption sheet can be suppressed.

[0071] <Corrugated Sheet> The corrugated sheet of the present disclosure is a corrugated sheet formed by bonding together the adsorbent sheets of the present disclosure, wherein the planar adsorbent sheet and the corrugated adsorbent sheet are bonded together to form cells through which air can pass. Figure 1(B) shows an example of a processed adsorbent sheet, i.e., an adsorbent sheet 1B processed into a corrugated shape. Figure 1(C) shows a corrugated sheet formed by laminating the corrugated adsorbent sheet 1B shown in Figure 1(B) onto the liner-shaped adsorbent sheet 1A shown in Figure 1(A). The corrugated sheet is produced by joining multiple bottom portions 10 of the corrugated adsorbent sheet 1B to the surface 11 of the liner-shaped adsorbent sheet 1A, and bonding the planar adsorbent sheet and the corrugated adsorbent sheet together forms numerous cells through which air can pass.

[0072] The method for joining the multiple bottom portions 10 of the corrugated adsorption sheet 1B to the surface 11 of the liner-shaped adsorption sheet 1A is not particularly limited, and they can be joined by a conventionally known joining method such as heat fusion, but a joining method using an adhesive 12 as shown in Figure 1 (C) is preferred.

[0073] The adhesive 12 is not particularly limited, but from the viewpoint of heat resistance, a silica-based inorganic adhesive is preferably used. Specific examples of silica-based inorganic adhesives include water glass, silica sol, and alumina sol. The adhesive 12 may be a mixture of the above-mentioned inorganic adhesive and an organic adhesive. Specific examples of organic adhesives include one or more organic adhesives selected from phenolic resins, epoxy resins, acrylic resins, urethane resins, polyester resins, melamine resins, silicone resins, fluororesins, vinyl acetate resins, ethylene vinyl acetate resins, polyvinyl acetal, polyamide, polyester, polyurethane, melamine resins, urea resins, vinyl chloride resins, polyesters, and copolymers thereof.

[0074] <Corrugated sheet laminate> The corrugated sheet laminate of the present disclosure is a corrugated sheet formed by laminating corrugated sheets. In the corrugated sheet laminate of the present disclosure, the lamination method of the corrugated sheets is not particularly limited, and they can be laminated by a known method. For example, a plurality of planar corrugated sheets may be laminated, or the corrugated sheets may be laminated by rolling them.

[0075] An example of a corrugated sheet laminate is shown in Figure 2. The corrugated sheet laminate 2 shown in Figure 2(B) is formed by winding the corrugated sheet laminate shown in Figure 1(C) into a rotor shape as shown in Figure 2(A), and has a honeycomb shape.

[0076] In the corrugated sheet laminate, the number of cells per area of ​​the surface through which air passes (cells / cm ２ ) is 80 pieces / cm ２ More than 135 pieces / cm ２ Preferably, 90 or less particles / cm ２ More than 120 pieces / cm ２The following is more preferable: When the lower limit of the number of cells per area is in the above range, the strength of the corrugated sheet laminate is further improved. When the upper limit of the number of cells per area is in the above range, the amount of air passing through the corrugated sheet laminate is further improved.

[0077] <Adsorption element> The adsorption element of the present disclosure is an adsorption element made of the above-described corrugated laminate of the present disclosure. The adsorption element of the present disclosure is manufactured by stacking one or more corrugated sheets according to the application or purpose to form a corrugated laminate, and then adding a core, outer panels, and edge treatment to the corrugated laminate. The adsorption element is also commonly referred to as a desiccant rotor.

[0078] The type of adsorption element is not particularly limited, and any conventionally known type can be used. For example, a cross-flow type adsorption element can be manufactured by using a pleated adsorption sheet, and a parallel-flow type adsorption element can be manufactured by using a honeycomb-shaped corrugated sheet. Cross-flow type adsorption elements and parallel-flow type adsorption elements have a large contact area with the air to be treated, which allows for high adsorption performance of the air to be treated and low pressure loss of the adsorption element. Furthermore, parallel-flow type adsorption elements are superior to cross-flow type adsorption elements in terms of preventing clogging due to mist and debris, reducing pressure loss, and reducing weight, making them more suitable for use in adsorption / desorption treatment devices.

[0079] The adsorption element of the present disclosure is also an adsorption element comprising a porous metal complex and / or silica gel and a water-absorbable fiber, and has a wave number of 3000 to 3700 cm in a dry state as measured by infrared spectroscopy. －１ and the wavenumber A of the peak top in the range of 3000 to 3700 cm in the humidified state. －１ The difference between the wavenumber B and the peak top in the range (A-B) is 8.5 cm －１ 34cm or more －１ It is also an adsorption element characterized by the following:

[0080] The adsorption element need only have the above-mentioned characteristics in the peak top measured by infrared spectroscopy of the adsorption sheet constituting the adsorption element, and does not need to be an adsorption element consisting of the above-mentioned adsorption sheet, corrugated sheet, or corrugated laminate of the present disclosure.

[0081] Examples of methods for producing such an adsorption element include a method in which an adsorption sheet is produced from hydrated fibers, and a corrugated sheet, corrugated laminate, or adsorption element is produced using the adsorption sheet, and these are then immersed in a porous material-containing composition containing a porous metal complex and / or silica gel, and, if necessary, an organic binder, a cationic surfactant, and other additives. The adsorption element produced by such a production method contains a porous metal complex and / or silica gel, and hydrated fibers, and exhibits a wave number of 3000 to 3700 cm in a dry state as measured by infrared spectroscopy. －１ and the wavenumber A of the peak top in the range of 3000 to 3700 cm in the humidified state. －１ The difference between the wavenumber B and the peak top in the range (A-B) is 8.5 cm －１ 34cm or more －１ The adsorption element can have the following characteristics: Such an adsorption element is also one aspect of the present disclosure.

[0082] <Dehumidifier> The dehumidifier disclosed herein is a dehumidifier having a rotor in which the adsorption element rotates around a rotation axis, wherein the rotor has an adsorption zone and a regeneration zone along a circumferential direction that is the rotation direction, and is characterized by comprising: an adsorption zone air supply passage that supplies air to be treated to the adsorption zone and causes the moisture in the air to be treated to be adsorbed onto the rotor; and a regeneration zone air supply passage that supplies regeneration air to the regeneration zone and causes the moisture to be desorbed from the rotor that has adsorbed moisture.

[0083] The dehumidifier is a device equipped with the above-mentioned adsorption element, and configured to bring the air to be treated into contact with the adsorption element to adsorb the moisture contained in the air to be treated onto a porous material, and to bring regeneration air into contact with the adsorption element that has adsorbed the moisture, thereby desorbing the moisture from the porous material.

[0084] The dehumidifier is, for example, a rotor-rotating type continuous adsorption / desorption treatment device 3 as shown in Fig. 3. The continuous adsorption / desorption treatment device 3 includes an adsorption rotor 4, which is a cylindrical rotating body that can be rotated about a rotation axis L by driving a motor. The adsorption rotor 4 includes, for example, adsorption elements 2 having a honeycomb structure as shown in Fig. 2(B). The adsorption rotor 4 is divided into an adsorption zone 40 and a regeneration zone 41 in the circumferential direction around the rotation axis L, and the adsorption elements 2 move alternately between the adsorption zone 40 and the regeneration zone 41 as the adsorption rotor 4 rotates.

[0085] As shown in FIG. 3 , the dehumidifier of the present disclosure has a rotor 4 on which the adsorption element 2 rotates around a rotation axis L, and the rotor 4 has an adsorption zone 40 and a regeneration zone 41 in a cross section perpendicular to the rotation axis L, and is equipped with an adsorption section air supply passage (not shown) that supplies air to be treated to the adsorption zone 40, and a regeneration zone air supply passage (not shown) that supplies air for regeneration to the regeneration zone 41.

[0086] The air to be treated is supplied to the adsorption zone 40 of the adsorption rotor 4 through the adsorption zone air supply passage by driving the fan 5, and as it passes through the adsorption elements 2 located in the adsorption zone 40, moisture contained in the air to be treated is adsorbed by the porous material contained in the adsorption elements 2. The regeneration air is heated by a heat source 6 such as a heater and is supplied to the regeneration zone 41 of the adsorption rotor 4 through the regeneration zone air supply passage by driving the fan 7, and as it passes through the adsorption elements 2 located in the regeneration zone 41, moisture is desorbed from the porous material, thereby regenerating the porous material.

[0087] The rotor-rotating dehumidifier is not limited to the above-described example, and other conventionally known dehumidifiers may be used. Furthermore, the dehumidifier is not limited to the rotor-rotating dehumidifier.

[0088] The above describes one embodiment of the adsorption sheet, corrugated sheet, corrugated laminate, adsorption element, and dehumidifier of the present disclosure, but the adsorption sheet, corrugated sheet, corrugated laminate, adsorption element, and dehumidifier of the present disclosure are not limited to the above-described embodiment, and various modifications are possible as long as they do not deviate from the spirit of the present disclosure.

[0089] The adsorption sheets, corrugated sheets, corrugated laminates, adsorption elements, and dehumidifiers disclosed herein are used to dehumidify air in a variety of locations, including electrical equipment manufacturing plants, homes, buildings, condominiums, hospitals, factories, and commercial facilities, as well as spaces inside various vehicles such as automobiles, trains, and airplanes, for the purpose of reducing humidity.

[0090] The functions and effects of the adsorption sheet of the present disclosure will be specifically explained below by showing examples thereof, but the adsorption sheet of the present disclosure is not limited to the following examples.

[0091] Example 1 SiO ２ / Na ２ Sodium silicate with a molar ratio of 2.9 was added dropwise to sulfuric acid with a concentration of 18% by mass to prepare silica hydrogel. The prepared silica hydrogel was washed with a large amount of water and then immersed in sulfuric acid adjusted to pH 4 at 30°C for about 2 hours to prepare silica gel.

[0092] In addition, non-fibrillated aramid fibers and fibrillated aramid fibers were placed in a stainless steel container, and a mixed gas of ozone and oxygen was supplied to the stainless steel container under the conditions of an ozone concentration of 2 mg / L and a flow rate of 0.5 L / h, to prepare aramid fibers after oxidation treatment.

[0093] Next, 75% by mass (excluding solvent molecules) of the prepared silica gel, 12% by mass in total of non-fibrillated aramid fibers after oxidation treatment and fibrillated aramid fibers after oxidation treatment, 8% by mass of polyvinyl alcohol (PVA) fibers having a water dissolution temperature of 60 to 90°C as an organic binder, and 5% by mass of glass fibers were mixed and stirred in a mixer for about 5 minutes.

[0094] Next, a polymer flocculant was added, and the weight was 65 g / m ２ An adsorbent sheet was produced using a wet papermaking machine with a weight of 100g.

[0095] Furthermore, the produced adsorption sheet was fed between meshing gear rollers having triangular teeth to form a corrugated shape.

[0096] A corrugated sheet was prepared by bonding the flat and corrugated adsorption sheets together using an adhesive to a degree that would prevent the honeycomb from peeling off. The honeycomb was then wrapped around a core material using an adhesive to a degree that would prevent the honeycomb from peeling off, producing a rotor-shaped corrugated laminate with a thickness of 200 mm, an inner diameter of 40 mm, and an outer diameter of 350 mm. An iron outer plate was then wrapped around the corrugated laminate to produce an adsorption element.

[0097] Example 2 The adsorption sheet, the corrugated sheet, the corrugated laminate, and the adsorption element of Example 2 were produced in the same manner as in Example 1, except that 75% by mass (excluding solvent molecules) of the prepared silica gel, a total of 17% by mass of non-fibrillated aramid fibers after oxidation treatment and fibrillated aramid fibers after oxidation treatment, 7% by mass of polyvinyl alcohol (PVA) fibers having a water dissolution temperature of 60 to 90°C as an organic binder, and 1% by mass of glass fibers were mixed and stirred in a mixer for about 5 minutes.

[0098] Example 3 The adsorption sheet, the corrugated sheet, the corrugated laminate, and the adsorption element of Example 3 were produced in the same manner as in Example 1, except that 75% by mass (excluding solvent molecules) of the prepared silica gel, 3% by mass of non-fibrillated aramid fibers after oxidation treatment and 3% by mass of fibrillated aramid fibers after oxidation treatment, 10% by mass of polyvinyl alcohol (PVA) fibers having a dissolution temperature in water of 60 to 90°C as an organic binder, and 12% by mass of glass fibers were mixed and stirred in a mixer for about 5 minutes.

[0099] Example 4: 0.5 g of Fe(NO ３ ) ３ ・9H ２ An organometallic complex was prepared by dissolving 0 and 0.1 g of azobenzene-3,3'-5,5'-tetracarboxylic acid in 20 mL of N,N-dimethylformamide and 10 mL of acetic acid and heating at 150°C for 24 hours. The physical properties of the obtained organometallic complex were evaluated by nitrogen adsorption measurement, and the BET specific surface area was found to be 1227 m. ２ / g.

[0100] Next, the adsorption sheet, the corrugated sheet, the corrugated laminate, and the adsorption element of Example 4 were produced in the same manner as in Example 1, except that 75% by mass (excluding solvent molecules) of the prepared organometallic complex, 12% by mass of non-fibrillated aramid fibers after oxidation treatment and 12% by mass of fibrillated aramid fibers after oxidation treatment, 8% by mass of polyvinyl alcohol (PVA) fibers having a water dissolution temperature of 60 to 90°C as an organic binder, and 5% by mass of glass fibers were mixed and stirred in a mixer for about 5 minutes.

[0101] Comparative Example 1 The adsorption sheet, corrugated sheet, corrugated laminate, and adsorption element of Comparative Example 1 were produced in the same manner as in Example 1, except that 80% by mass (excluding solvent molecules) of the prepared silica gel, 1% by mass of fibrillated aramid fiber after oxidation treatment, 8% by mass of non-fibrillated ceramic fiber and pulp combined, 10% by mass of polyvinyl alcohol (PVA) fiber having a water dissolution temperature of 60 to 90°C as an organic binder, and 1% by mass of glass fiber were mixed and stirred in a mixer for approximately 5 minutes.

[0102] Comparative Example 2 The adsorption sheet, the corrugated sheet, the corrugated laminate, and the adsorption element of Comparative Example 2 were produced in the same manner as in Example 1, except that 55% by mass (excluding solvent molecules) of the prepared silica gel, 32% by mass of non-fibrillated aramid fibers after oxidation treatment and 32% by mass of fibrillated aramid fibers after oxidation treatment, 8% by mass of polyvinyl alcohol (PVA) fibers having a water dissolution temperature of 60 to 90°C as an organic binder, and 5% by mass of glass fibers were mixed and stirred in a mixer for about 5 minutes.

[0103] <Evaluation Method> The following evaluations were carried out for the Examples and Comparative Examples.

[0104] (1) Peak Top Wavenumber Difference (A-B) The adsorption sheets obtained in the Examples and Comparative Examples were used as measurement samples. The absorbance of the prepared samples was measured by the ATR method under the following conditions using an infrared spectrophotometer (FTIR) (product name: Cary 670 (manufactured by Agilent), GoldenGate Heated Diamond ATR (manufactured by Specac)).

[0105] (Measurement conditions) Measurement area: 2 mm x 2 mm Measurement wavelength range: 500 cm －１ ~4000cm －１ Number of integration: 128 times Resolution: 4cm －１

[0106] (Dry Atmospheric Conditions) The absorbance was measured while maintaining a dried state in an air atmosphere at a temperature of 150° C. for 10 minutes or more.

[0107] (Wet Atmospheric Conditions) The absorbance was measured while the sample was left standing in an air atmosphere at a temperature of 25° C. and a humidity of 50% RH for 10 minutes or more.

[0108] Spectra obtained in dry and wet conditions, wavenumbers 3000-3700 cm －１ The wave number at which the peak intensity reaches its maximum value between these values ​​was defined as the "peak top wave number." The wave number at the peak top in the dry state was defined as A (cm －１ ), the wave number of the peak top in the wet state is B (cm －１ ) and the difference A-B (cm －１ ) was calculated and used as the measured value.

[0109] (2) Dehumidification Performance The adsorption elements prepared in the Examples and Comparative Examples were mounted in a dehumidifier with a zone chamber ratio of adsorption zone:regeneration zone = 3:1, and treated air having a temperature of 25°C and an absolute humidity of 5.4 g / kg-DA was supplied from the inlet of the adsorption zone at a passing air velocity of 4 m / s to dehumidify, and the treated air was discharged from the outlet of the adsorption zone. Next, regeneration air having a temperature of 140°C and a humidity of 5.4 g / kg-DA was supplied from the inlet of the regeneration zone at a flow rate one-third that of the treated air, and the regeneration outlet air was discharged from the outlet of the regeneration zone. The treated air and the regeneration air were ventilated in countercurrent directions. The absolute humidity (g / kg-DA) of the treated air was measured as a value of dehumidification performance.

[0110] The results are shown in Table 1.

[0111]

[0112] From the results in Table 1, measurement by infrared spectroscopy shows that the wave number in the dry state is 3000 to 3700 cm －１and the wavenumber A of the peak top in the range of 3000 to 3700 cm in the humidified state. －１ The difference between the wavenumber B and the peak top in the range (A-B) is 8.5 cm －１ 34cm or more －１ In Examples 1 to 4 using the adsorption sheet described below, the dehumidifier had excellent dehumidifying performance, and the A-B value was low, indicating that moisture was easily desorbed, thereby reducing the thermal load.

[0113] In contrast, the value of A-B is 38.6 cm －１ and 34 cm －１ In Comparative Example 1, which used an adsorption sheet exceeding 1.20 g / kg-DA, the absolute humidity after dehumidification was 1.20 g / kg-DA, indicating poor dehumidification performance. In addition, the value of A - B was also large, indicating that the heat load for moisture desorption was large.

[0114] Also, the value of A-B is 7.7 cm －１ and 8.5 cm －１ In Comparative Example 2, in which an adsorption sheet with a humidity of less than 100% was used, the absolute humidity after dehumidification was 2.10 g / kg-DA, and it was found that the dehumidification performance was poor.

Claims

1. An adsorption sheet made of porous metal complexes and / or silica gel, and hydrated fibers, which, when measured by infrared spectroscopy, has a wave number of 3000 to 3700 cm in a dry state. －１ and the wavenumber A of the peak top in the range of 3000 to 3700 cm in the humidified state. －１ The difference between the wavenumber B and the peak top in the range (A-B) is 8.5 cm －１ 34cm or more －１ An adsorption sheet characterized by:

2. The adsorbent sheet according to claim 1, which contains 40 to 85 mass % of the porous metal complex and / or silica gel.

3. The adsorbent sheet of claim 1, wherein the water-absorbable fibers include fibrillated fibers.

4. A corrugated sheet formed by bonding together the adsorbent sheets according to claim 1, wherein the flat adsorbent sheet and the corrugated adsorbent sheet are bonded together, and the corrugated sheet has cells through which air can pass.

5. A corrugated laminate obtained by laminating the corrugated sheets according to claim 4.

6. The number of cells per area of ​​the surface through which air passes (cells / cm ２ ) is 80 pieces / cm ２ More than 135 pieces / cm ２ 6. The stepped laminate of claim 5, wherein:

7. An adsorption element comprising the stepped laminate of claim 5.

8. An adsorption element containing a porous metal complex and / or silica gel and a water-absorbable fiber, which, when measured by infrared spectroscopy, has a wave number of 3000 to 3700 cm in a dry state. －１ and the wavenumber A of the peak top in the range of 3000 to 3700 cm in the humidified state. －１ The difference between the wavenumber B and the peak top in the range (A-B) is 8.5 cm －１ 34cm or more －１ An adsorption element characterized by:

9. A dehumidifier having a rotor in which the adsorption element according to claim 7 or 8 rotates around a rotation axis, wherein the rotor has an adsorption zone and a regeneration zone along the circumferential direction, which is the direction of rotation, and is characterized by comprising: an adsorption zone air supply path that supplies air to be treated to the adsorption zone, causing the moisture in the air to be treated to be adsorbed onto the rotor; and a regeneration zone air supply path that supplies regeneration air to the regeneration zone, causing the moisture to be desorbed from the rotor that has adsorbed the moisture.

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