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

Abstract

The present invention provides: an adsorption sheet which is inhibited from suffering a decrease in moisture-adsorbing performance due to a binder and has a high ratio of moisture adsorption to nitrogen adsorption; and a corrugated sheet, a corrugated laminate, an adsorption element, and a dehumidifier each including the adsorption sheet.　This adsorption sheet comprises a porous metal complex and / or a silica gel, base fibers, and an organic binder, the adsorption sheet being characterized in that, when the moisture adsorption per unit weight at a relative pressure of 0.50 is expressed by A (cc / g) and the nitrogen adsorption per unit weight at a relative pressure of 0.50 is expressed by B (cc / g), then C calculated with the equation C = A (cc / g) / B (cc / g) is 1.01 or greater.

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 adsorption performance of silica gel has not been fully considered.

[0005] Silica gel has a porous structure that allows it to efficiently adsorb moisture within its pores. For this reason, it is used as an adsorbent in dehumidifiers. To improve the performance of dehumidifiers, it is necessary to increase the moisture capacity of adsorbents such as silica gel.

[0006] However, in order to support the adsorbent on the adsorbent sheet, it is necessary to add an appropriate amount of binder to the adsorbent, which poses the problem of some of the pores of the adsorbent being blocked by the binder. In the nitrogen gas adsorption method widely used in pore analysis, such an adsorbent sheet with partially blocked pores not only has a reduced nitrogen adsorption capacity and reduced surface properties such as specific surface area and pore volume, but also a reduced adsorption capacity of the moisture to be adsorbed.

[0007] Therefore, there is a need to develop an adsorption sheet that adsorbs a sufficient amount of moisture, which is the target of adsorption, even when the nitrogen adsorption amount is reduced by the binder, and in which the binder prevents the reduction in moisture adsorption amount, as well as a corrugated sheet, corrugated laminate, adsorption element, and dehumidifier that use such an adsorption sheet.

[0008] Japanese Patent Application Laid-Open No. 2021-181072

[0009] The present disclosure aims to provide an adsorption sheet in which the reduction in moisture adsorption performance due to the binder is suppressed and the ratio of moisture adsorption amount to nitrogen adsorption amount is large, as well as a corrugated sheet, a corrugated laminate, an adsorption element, and a dehumidifier that use the same.

[0010] As a result of extensive research, the present inventors have found that, in an adsorption sheet comprising a porous metal complex and / or silica gel, a base fiber, and an organic binder, when the water adsorption amount per unit weight of the adsorption sheet at a relative pressure of 0.50 is defined as A and the nitrogen adsorption amount per unit weight of the adsorption sheet at a relative pressure of 0.50 is defined as B, the above-mentioned object can be achieved if C = A / B falls within a specific range, and have completed the present invention.

[0011] 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, base fiber, and an organic binder, wherein C calculated by the following formula, where A (cc / g) is the water adsorption amount per unit weight at a relative pressure of 0.50 and B (cc / g) is the nitrogen adsorption amount per unit weight at a relative pressure of 0.50, is 1.01 or more: C=A(cc / g) / B(cc / g). 2. The adsorbent sheet according to item 1, wherein the organic binder includes a polyvinyl alcohol-based polymer. 3. The adsorbent sheet according to item 1 or 2, wherein the adsorbent sheet contains 40 to 85 mass% of the porous metal complex and / or silica gel. 4. The adsorbent sheet according to any one of items 1 to 3, wherein the base fiber includes fibrillated fibers. 5. Item 6. A corrugated sheet formed by laminating the adsorbent sheets according to any one of items 1 to 4, wherein the planar adsorbent sheet and the corrugated adsorbent sheet are laminated together, and the corrugated sheet has cells through which air passes. Item 7. A corrugated laminate formed by laminating the corrugated sheets according to item 5. Item 8. A corrugated laminate formed by laminating the corrugated sheets according to item 6. A corrugated laminate formed by laminating the corrugated sheets according to item 7 ... ２ ) is 80 pieces / cm ２ More than 135 pieces / cm ２Item 6. A stepped laminate according to Item 6, wherein: 8. An adsorption element comprising the stepped laminate according to Item 6 or 7. 9. An adsorption element comprising a porous metal complex and / or silica gel, a base fiber, and an organic binder, wherein C calculated by the following formula, where A (cc / g) is the water adsorption amount per unit weight at a relative pressure of 0.50 and B (cc / g) is the nitrogen adsorption amount per unit weight at a relative pressure of 0.50, is 1.01 or more: C=A(cc / g) / B(cc / g). 10. Item 10. A dehumidifier having a rotor in which the adsorption element according to Item 8 or 9 rotates around a rotation axis, wherein the rotor has an adsorption zone and a regeneration zone along a circumferential direction that is a rotation direction, and the dehumidifier is provided with: an adsorption zone air supply path that supplies air to be treated to the adsorption zone, causing moisture in the air to be treated to be adsorbed by the rotor; and a regeneration zone air supply path that supplies regeneration air to the regeneration zone, causing moisture to be desorbed from the rotor that has adsorbed moisture.

[0012] The adsorbent sheet of the present disclosure is prevented from having a decrease in moisture adsorption performance due to the binder, and has a high ratio of moisture adsorption amount to nitrogen adsorption amount. Furthermore, a corrugated sheet, a corrugated laminate, and a dehumidifier using an adsorbent element of the present disclosure can exhibit excellent dehumidifying performance because the adsorbent sheet is prevented from having a decrease in moisture adsorption performance due to the binder.

[0013] 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.

[0014] The adsorption sheet, corrugated sheet, corrugated laminate, adsorption element, and dehumidifier of the present disclosure will be described in detail below.

[0015] 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.

[0016] 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.

[0017] 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."

[0018] In this specification, "A and / or B" means either one of A and B, or both A and B.

[0019] 1. Adsorption Sheet The adsorption sheet of the present disclosure is an adsorption sheet comprising a porous metal complex and / or silica gel, a base fiber, and an organic binder, and has a value of C calculated by the following formula, where A (cc / g) is the water adsorption amount per unit weight at a relative pressure of 0.50, and B (cc / g) is the nitrogen adsorption amount per unit weight at a relative pressure of 0.50, of 1.01 or more: C = A (cc / g) / B (cc / g)

[0020] The adsorbent sheet of the present disclosure having the above-described characteristics has a porous metal complex and / or silica gel supported on the base fiber using an organic binder, and since the amount supported is sufficient, the adsorbent sheet can exhibit excellent dehumidifying performance.

[0021] Furthermore, since the adsorption sheet of the present disclosure has a C calculated by the above formula of 1.01 or more, the decrease in adsorption performance for small molecules such as water molecules is suppressed compared to the decrease in adsorption performance for large molecules such as nitrogen molecules. In the adsorption sheet of the present disclosure, when a porous metal complex and / or silica gel is supported on a base fiber using an organic binder, even if the nitrogen adsorption amount decreases due to pore blockage caused by the organic binder coating, the decrease in the water adsorption amount, which is related to dehumidification performance, is suppressed.

[0022] In other words, according to the adsorption sheet of the present disclosure, a sufficient amount of porous metal complex and / or silica gel is supported using an organic binder, and even if the pores are blocked by the organic binder coating, a decrease in the amount of water adsorption, which is related to dehumidifying performance, is suppressed, thereby enabling the sheet to exhibit excellent dehumidifying performance.

[0023] The above C is preferably 1.1 or more, more preferably 1.5 or more. There is no particular upper limit to C, but it is about 3.0.

[0024] Examples of methods for adjusting C to 1.01 or greater include (i) adjusting the content of the porous metal complex and / or silica gel in the adsorption sheet. Increasing the content of the porous metal complex and / or silica gel increases the value of C, while decreasing the content of the porous metal complex and / or silica gel decreases the value of C. Another example of such adjustment method is (ii) adjusting the particle size of the porous metal complex and / or silica gel. Increasing the particle size of the porous metal complex and / or silica gel increases the value of C, while decreasing the particle size of the porous metal complex and / or silica gel decreases the value of C. (iii) Furthermore, optimizing the drying temperature and time after wet papermaking for the porous metal complex and / or silica gel, respectively, increases the value of C.

[0025] The above C is measured by measuring A (cc / g) and B (cc / g) by the following measurement method, and calculating C by the formula C = A (cc / g) / B (cc / g).

[0026] [Method for measuring A (moisture adsorption amount per unit weight at a relative pressure of 0.50)] Approximately 100 mg of a portion of the adsorption sheet is collected, vacuum dried at 120°C for 12 hours, and then weighed. Using a high-precision gas / vapor adsorption measuring device (BELSORP-max, manufactured by BEL Japan), the amount of water vapor adsorption at 25°C is measured at 40 points while gradually increasing the relative pressure in the range of 0.02 to 0.95, and an adsorption isotherm is created. From the calibration curve, the amount of moisture adsorption per 1 g at the target relative pressure is read, and the moisture adsorption amount (cc / g) is calculated and used as the measured value. In the case of an adsorption element, the measurement is performed by collecting a portion of the adsorption sheet that constitutes the adsorption element.

[0027] [Method for measuring B (nitrogen adsorption amount per unit weight at a relative pressure of 0.50)] Approximately 100 mg of a portion of the adsorption sheet is collected, vacuum dried at 120°C for 12 hours, and then weighed. Using an automatic specific surface area measuring device (Gemini 2375, manufactured by Micromeritics), the adsorption amount of nitrogen gas at the boiling point of liquid nitrogen (-195.8°C) is measured at 40 points while gradually increasing the relative pressure in the range of 0.02 to 0.95, and an adsorption isotherm is created. From this calibration curve, the amount of nitrogen adsorption per 1 g at the target relative pressure is calculated. ２ The adsorption amount (cc / g) is read and the nitrogen adsorption amount (cc / g) is calculated as the measured value. In the case of an adsorption element, the measurement is performed by taking a part of the adsorption sheet that constitutes the adsorption element.

[0028] Hereinafter, each of the constituent elements of the suction sheet of the present disclosure will be described in detail.

[0029] <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.

[0030] 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.

[0031] Porous metal complexes (PCPs) are porous materials formed by the self-assembly of metal ions, which can take various coordination forms, and organic ligands with two or more coordination sites. The organic ligands bridge the metal ions, which act as nodes, to form a framework structure, and the pores within this framework act as spaces for capturing the target substances.

[0032] 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).

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] The size of the porous metal complex and / or silica gel 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.

[0038] 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.

[0039] 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.

[0040] 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 m ２ / g or more, more preferably 300m ２ / g or more, more preferably 400m ２ / g or more.

[0041] 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.

[0042] The water adsorption rate of the porous metal complex at 25°C and a relative pressure of 0.50 was measured by collecting approximately 100 mg of the porous metal complex (before treatment with water or an organic solvent), vacuum drying it at 120°C for 12 hours, and weighing it. Then, using a high-precision gas / vapor adsorption measuring device (BELSORP-max, manufactured by BEL Japan Co., Ltd.), the amount of water vapor adsorption at 25°C was measured at 40 points while gradually increasing the relative pressure in the range of 0.02 to 0.95, and an adsorption isotherm was created. At this time, the target relative pressure was set to 0.001, 0.01, 0.05, 0.10, 0.20, 0.30, 0.40, 0.50, 0.60, 0.70, 0.80, and 0.90, and the adsorption amount increase / decrease tolerance was set to 30 cm at a relative pressure of 0 to 0.30. ２ / g, 50 cm at relative pressures of 0.30 to 0.50 ２ / g, relative pressure 0.50 or more 30 cm ２ The water adsorption rate [%] can be calculated from the amount of water adsorbed [g] per 1 g of porous metal complex at a relative pressure of 0.50 using the following formula 1:

[0043] Moisture adsorption rate = moisture adsorption amount per 1 g of porous metal complex [g] × 100 (Equation 1)

[0044] 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.

[0045] 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, zeolite, activated alumina, aluminophosphates, silicoaluminophosphates, and organic polymer porous materials such as styrene-divinylbenzene copolymers.

[0046] <Base Fiber> The base fiber is not particularly limited, and specific examples thereof 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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 and / or silica gel from the adsorbent sheet. In addition, the strength of the adsorbent sheet can be sufficiently ensured.

[0052] The content of the base fiber 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 the base fiber in the adsorbent sheet is not particularly limited, but is preferably 25% by mass or less. When the content of the base fiber 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 the porous metal complex and / or silica gel from the adsorbent sheet. Furthermore, the strength of the adsorbent sheet can be sufficiently ensured.

[0053] <Organic Binder> The adsorption sheet contains 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] <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.

[0060] 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.

[0061] <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.

[0062] 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.

[0063] 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.

[0064] Specific tensile elongation = Maximum point elongation [%] / Sample width [m] / Basis weight of adsorption sheet [g / m ２ ]...(Formula 2)

[0065] 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.

[0066] 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 ２If 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.

[0067] <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.

[0068] The method for joining the multiple bottom portions 10 of the corrugated suction sheet 1B to the surface 11 of the liner-shaped suction sheet 1A is not particularly limited, but a joining method using an adhesive 12 as shown in Figure 1 (C) is preferred.

[0069] 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.

[0070] <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.

[0071] 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.

[0072] 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, 80 or less particles / cm ２ More than 120 pieces / cm ２ The 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.

[0073] <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.

[0074] 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.

[0075] The adsorption element of the present disclosure is also an adsorption element comprising a porous metal complex and / or silica gel, a base fiber, and an organic binder, characterized in that C calculated by the following formula, C = A (cc / g) / B (cc / g), is 1.01 or greater, where A (cc / g) is the moisture adsorption amount per unit weight at a relative pressure of 0.50, and B (cc / g) is the nitrogen adsorption amount per unit weight at a relative pressure of 0.50.

[0076] The adsorption element contains a porous metal complex and / or silica gel, a base fiber, and an organic binder, and it is sufficient that C calculated by the above formula is 1.01 or more; it does not have to be an adsorption element consisting of the adsorption sheet, corrugated sheet, or corrugated laminate disclosed above.

[0077] Examples of methods for producing such adsorption elements include manufacturing an adsorption sheet using base fiber, using the adsorption sheet to manufacture a corrugated sheet, corrugated laminate, or adsorption element, and then immersing the resulting adsorption sheet in a porous material-containing composition containing a porous metal complex and / or silica gel, an organic binder, and, if necessary, other additives. The adsorption element manufactured by this method contains a porous metal complex and / or silica gel, base fiber, and an organic binder, and can have the following characteristics: C = A (cc / g) / B (cc / g), where A (cc / g) is the water adsorption capacity per unit weight at a relative pressure of 0.50 and B (cc / g) is the nitrogen adsorption capacity per unit weight at a relative pressure of 0.50, and C is 1.01 or greater. Such adsorption elements are also part of the present disclosure.

[0078] <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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] The rotor-rotating dehumidifier is not limited to the above-mentioned example, and other conventionally known dehumidifiers may be used. Furthermore, the dehumidifier is not limited to the rotor-rotating dehumidifier.

[0084] 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.

[0085] The adsorption sheets, corrugated sheets, corrugated laminates, adsorption elements, and dehumidifiers disclosed herein are used to dehumidify air in a variety of locations, such as electronic equipment manufacturing plants, warehouses, 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.

[0086] 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.

[0087] 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 a temperature of 30°C for approximately 2 hours to prepare silica gel. The prepared silica gel was crushed to an average particle size of 50 μm.

[0088] Next, 80% by mass of the prepared silica gel, 14% by mass of aramid fiber as a base fiber, and 6% by mass of PVA as an organic binder were mixed to form a sieve with a basis weight of 75 g / m ２ A sheet-like material was prepared using a wet papermaking apparatus with a weight of 100g. The sheet-like material was then placed on a drying substrate sheet, transported to a drying roller at 120°C coated with the minimum amount of surfactant necessary to prevent the adsorption sheet from sticking, and dried for 3 minutes. The drying substrate sheet was then peeled off to produce an adsorption sheet.

[0089] The produced planar adsorption sheet and a corrugated sheet, which was an adsorption sheet with corrugations applied, were bonded together using a modified vinyl acetate adhesive to produce a corrugated sheet. The corrugated sheets were wrapped around a core material while bonding the corrugated sheets together using the modified vinyl acetate adhesive to produce a corrugated laminate. An iron outer plate was then wrapped around the corrugated laminate to produce an adsorption element.

[0090] Example 2: 0.5 g of Fe(NO ３ ) ３ ・9H ２O and 0.1 g of azobenzene-3,3'-5,5'-tetracarboxylic acid were dissolved in 20 mL of N,N-dimethylformamide and 10 mL of acetic acid, and the mixture was heated at 150°C for 24 hours to prepare an organometallic complex. The prepared organometallic complex was pulverized to an average particle size of 50 μm. 80% by mass of the prepared organometallic complex was mixed with 14% by mass of aramid fiber as the base fiber and 6% by mass of PVA as the organic binder, resulting in a 75 g / m2 sample. ２ A sheet material was prepared using a wet papermaking machine with a weight of 100g.

[0091] The sheet-like material was then placed on a drying substrate sheet and transported to a drying roller at 120°C to which the minimum amount of surfactant necessary to prevent the adsorption sheet from sticking had been applied, and dried for 3 minutes. The drying substrate sheet was then peeled off to produce an adsorption sheet. The adsorption element of Example 2 was produced using the produced adsorption sheet in the same manner as in Example 1.

[0092] Example 3 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 a temperature of 30°C for approximately 2 hours to prepare silica gel. The prepared silica gel was crushed to an average particle size of 10 μm.

[0093] Next, 75% by mass of the prepared silica gel, 17% by mass of aramid fiber as the base fiber, and 8% by mass of PVA as the organic binder were mixed to form a sack of 75 g / m ２ A sheet material was prepared using a wet papermaking apparatus with a weight of 100g. The sheet material was then placed on a drying substrate sheet, transported to a drying roller at 120°C coated with the minimum amount of surfactant necessary to prevent the adsorption sheet from sticking, and dried for 3 minutes. The drying substrate sheet was then peeled off to produce an adsorption sheet. The adsorption element of Example 3 was produced using the produced adsorption sheet in the same manner as in Example 1.

[0094] Example 4 SiO ２ / Na ２Sodium 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 a temperature of 30°C for approximately 2 hours to prepare silica gel. The prepared silica gel was crushed to an average particle size of 10 μm.

[0095] Next, 70% by mass of the prepared silica gel, 20% by mass of a combination of glass fiber and ceramic wool as base fiber, and 10% by mass of PVA as an organic binder were mixed to form a sieve with a basis weight of 75 g / m ２ A sheet material was prepared using a wet papermaking apparatus with a weight of 100g. The sheet material was then placed on a drying substrate sheet, transported to a drying roller at 120°C to which the minimum amount of surfactant necessary to prevent paper sticking had been applied, and dried for 3 minutes. The drying substrate sheet was then peeled off to produce an adsorbent sheet. The adsorbent element of Example 4 was produced using the produced adsorbent sheet in the same manner as in Example 1.

[0096] (Comparative 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 a temperature of 30°C for approximately 2 hours to prepare silica gel. The prepared silica gel was crushed to an average particle size of 10 μm.

[0097] Next, 75% by mass of the prepared silica gel, 17% by mass of aramid fiber as the base fiber, and 8% by mass of PVA as the organic binder were mixed to form a sack of 75 g / m ２ A sheet material was prepared using a wet papermaking apparatus with a weight of 100g. The sheet material was then placed on a drying substrate sheet, transported to a drying roller at 140°C to which the minimum amount of surfactant necessary to prevent paper sticking had been applied, and dried for 30 seconds. The drying substrate sheet was then peeled off to produce an adsorbent sheet. The adsorbent element of Comparative Example 1 was produced using the produced adsorbent sheet in the same manner as in Example 1.

[0098] (Comparative Example 2) SiO ２ / Na２ 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 a temperature of 30°C for approximately 2 hours to prepare silica gel. The prepared silica gel was crushed to an average particle size of 2 μm.

[0099] Next, 75% by mass of the prepared silica gel, 17% by mass of aramid fiber as the base fiber, and 8% by mass of PVA as the organic binder were mixed to form a sack of 75 g / m ２ A sheet material was prepared using a wet papermaking apparatus with a weight of 1.2g. The sheet material was then placed on a drying substrate sheet, transported to a drying roller at 140°C to which the minimum amount of surfactant necessary to prevent paper sticking had been applied, and dried for 1.2 minutes. The drying substrate sheet was then peeled off to produce an adsorbent sheet. The adsorbent element of Comparative Example 2 was produced using the produced adsorbent sheet in the same manner as in Example 1.

[0100] <Evaluation Method> The following evaluations were carried out for the Examples and Comparative Examples.

[0101] [Method for measuring C = A (cc / g) / B (cc / g)] C was measured by measuring A (cc / g) and B (cc / g) using the following measurement method, and calculating C using the formula C = A (cc / g) / B (cc / g).

[0102] [Method for measuring A (moisture adsorption amount per unit weight at a relative pressure of 0.50)] Approximately 100 mg of a portion of the adsorption sheet was collected, vacuum dried at 120 ° C for 12 hours, and then weighed. Using a high-precision gas / vapor adsorption measuring device (BELSORP-max, manufactured by BEL Japan), the amount of water vapor adsorption at 25 ° C was measured at 40 points while gradually increasing the relative pressure in the range of 0.02 to 0.95, and an adsorption isotherm was created. From the calibration curve, the amount of moisture adsorption per 1 g at the target relative pressure was read, and the moisture adsorption amount (cc / g) was calculated and used as the measured value. In the case of an adsorption element, the measurement was performed by collecting a portion of the adsorption sheet that constitutes the adsorption element.

[0103] [Method for measuring B (nitrogen adsorption amount per unit weight at a relative pressure of 0.50)] Approximately 100 mg of a portion of the adsorption sheet was sampled, vacuum dried at 120°C for 12 hours, and then weighed. Using an automatic specific surface area measuring device (Gemini 2375, manufactured by Micromeritics), the adsorption amount of nitrogen gas at the boiling point of liquid nitrogen (-195.8°C) was measured at 40 points while gradually increasing the relative pressure in the range of 0.02 to 0.95, and an adsorption isotherm was created. From this calibration curve, the amount of N adsorption per 1 g at the target relative pressure was calculated. ２ The adsorption amount (cc) was read, and the nitrogen adsorption amount (cc / g) was calculated and used as the measured value. In the case of an adsorption element, the measurement was performed by taking a part of the adsorption sheet constituting the adsorption element.

[0104] [Evaluation of Dehumidification Performance] Dehumidification performance was evaluated using a dehumidification test device equipped with an adsorption element. The adsorption element used for evaluation was a cylindrical element formed by wrapping a honeycomb-shaped adsorption sheet around a core material to form a rotor. The adsorption element had a diameter of 350 mm and a thickness of 200 mm. The adsorption element was installed in an adsorption / desorption chamber in the dehumidification test device, which was zoned at a ratio of adsorption zone: regeneration zone = 3:1. While rotating at various rotation speeds, treated air at a temperature of 25°C and humidity of 5.4 g / kg-DA was supplied to the adsorption zone at a passing air velocity of 2 m / s, and regeneration air at a temperature of 140°C and humidity of 5.4 g / kg-DA was supplied to the regeneration zone, and the outlet absolute humidity of the adsorption zone was measured. The absolute humidity at the rotation speed that resulted in the lowest outlet absolute humidity was measured, and dehumidification performance was evaluated.

[0105] The results are shown in Table 1.

[0106]

[0107] From the results in Table 1, it was found that in Examples 1 to 4, the C(A(cc / g) / B(cc / g)) of the adsorbent sheets was 1.01 or more, and therefore, although the nitrogen adsorption amount was reduced due to the blocking of the pores of the porous material by the coating with the organic binder, the reduction in the water adsorption amount, which is related to the dehumidifying performance, was suppressed, and the fibers and the adsorbent were bonded together and the amount of porous material supported was sufficient, so that excellent dehumidifying performance could be exhibited.

[0108] In contrast, in Comparative Examples 1 and 2, the C(A (cc / g) / B (cc / g)) of the adsorption sheets was less than 1.01, which indicated that the amount of water adsorption was reduced due to the clogging of the pores of the porous material caused by the coating with the organic binder, resulting in poor dehumidification performance.

Claims

1. An adsorption sheet comprising a porous metal complex and / or silica gel, a base fiber, and an organic binder, wherein C calculated by the following formula, where A (cc / g) is the water adsorption amount per unit weight at a relative pressure of 0.50, and B (cc / g) is the nitrogen adsorption amount per unit weight at a relative pressure of 0.50, is 1.01 or greater: C = A (cc / g) / B (cc / g).

2. The adsorbent sheet according to claim 1, wherein the organic binder comprises a polyvinyl alcohol-based polymer.

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

4. The adsorbent sheet of claim 1, wherein the substrate fibers include fibrillated fibers.

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

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

7. 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 7. The stepped laminate of claim 6, wherein:

8. An adsorption element comprising the stepped laminate according to claim 6.

9. An adsorption element comprising a porous metal complex and / or silica gel, a base fiber, and an organic binder, wherein C calculated by the following formula, where A (cc / g) is the water adsorption amount per unit weight at a relative pressure of 0.50 and B (cc / g) is the nitrogen adsorption amount per unit weight at a relative pressure of 0.50, is 1.01 or more: C = A (cc / g) / B (cc / g).

10. A dehumidifier having a rotor in which the adsorption element according to claim 8 or 9 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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