JP2002079045A - Dehumidifying material and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a dehumidifying material for an adsorption type dehymidifier high in efficiency. SOLUTION: The dehumidifying material is obtained by supporting a mixture, which comprises a porous material having a specific surface area of 100 m2/g or more and a powder metal, on a base material, and the powder metal is added to the mixture in an amount of 30-80 mass %.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dehumidifying material and a method for producing the same, and more particularly to a dehumidifying material used in a dehumidifying device for reducing indoor humidity and particularly for air conditioning, and a method for producing the same.

[0002]

2. Description of the Related Art As a dehumidifying device utilizing the adsorption performance of porous materials such as silica gel and zeolite, a cylindrical honeycomb-shaped rotor is used for the dehumidifying material, and treated air is passed through a part of the rotor to perform dehumidification. There is a type in which dehumidifying material is dried and regenerated by passing heated regeneration air to another part of the rotor, and the rotor is rotated to continuously dehumidify. Further, in such a dehumidifier, cooling is necessary for the dehumidified material heated in the regeneration step to recover the adsorption performance again, and many dehumidifiers are provided with a mechanism for passing cooling air. Usually 1/4 of the circular cross section of the rotor
About １ ／ is used for heating and cooling, and the remaining portion is used for dehumidification.

In order to improve the dehumidifying ability of such a dehumidifying device, the volume of the dehumidifying material may be increased.
Since the size of the device is practically limited, it is necessary to consider the efficiency when the rotor size is fixed. That is, in order to improve the dehumidifying efficiency, it is preferable to increase the rotation speed in order to increase the area ratio of the dehumidifying portion of the rotor and increase the volume of the dehumidifying material per unit time. However, since a certain amount of time is required for heating and cooling the rotor, there are optimum values for the dehumidifying area ratio and the number of rotations, and there is a limit to improving the dehumidifying efficiency in this direction.

In view of the above, it is considered effective to improve the dehumidifying efficiency by reducing the heat capacity of the dehumidifying rotor or shortening the heating / regeneration time by increasing the heat transfer efficiency. Since such a viewpoint is common to the adsorption refrigerator, for example, Japanese Patent Application Laid-Open No. 58-193.
As described in Japanese Patent No. 062, there has been proposed a method of mixing a metal powder having good thermal conductivity such as copper or a filler with a porous dehumidifying material such as zeolite or silica gel. Japanese Patent Application Laid-Open No. 08-313111 proposes a method in which copper fibers are mixed and used.

[0005]

However, in these prior arts, only the adsorbent and the powder metal were mixed, so that the contact area between the porous dehumidifying material and the powder metal was small, and sufficient heat conduction was obtained. I couldn't. To apply this to a honeycomb-type dehumidifying rotor, a mixture of a porous dehumidifying material and a powdered metal is bonded to a nonwoven fabric with a binder to form a corrugated honeycomb, or a honeycomb substrate such as aluminum. Then, it is necessary to dip-coat the mixture of the porous dehumidifying material and the powder metal, which has been slurried and adjusted together with the binder.

For example, in Japanese Patent Application Laid-Open No. 10-286460, the above-mentioned slurry is applied by dip coating to the fins of a heat exchanger to constitute an adsorption heat exchanger. However, in this case, in addition to the pores of the porous dehumidifying material being concealed by the binder used to fix the adsorbent to the nonwoven fabric or the aluminum plate, the adsorbing performance is reduced, and the binder is formed of powder metal and the porous dehumidifying material. There is also a problem that it is difficult to obtain a high thermal conductivity by forming a heat insulating wall between them.

In Japanese Patent Application Laid-Open No. 7-19789, an attempt is made to improve the heat conduction of the entire rotor by using a nonwoven fabric impregnated with a dehumidifying material for a liner when forming a corrugated honeycomb and using an aluminum foil for the corrugated material. is suggesting. However, a sufficient amount of dehumidification could not be obtained because the absolute amount of dehumidification could not be obtained with the amount of dehumidification material that could be held only by the liner and the contact area between aluminum and the dehumidification material was also small.

In the present invention, in view of the above problems,
In obtaining a dehumidifier for an adsorption type dehumidifier with high dehumidification efficiency, heat conduction between the porous dehumidifier and a highly heat conductive material such as powdered metal is ensured, and thus the temperature of the dehumidifier increased during the continuous drying step. The purpose of the present invention is to provide a composite dehumidifying material that can be quickly lowered to maintain the dehumidifying performance continuously and that does not obscure the pores of the porous dehumidifying material, and that the dehumidifying material is bonded and fixed to a substrate.

[0009]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, the above-mentioned problems have been solved by supporting a mixture of a porous body and a powdered metal on a substrate. And found that the present invention was completed.

That is, the dehumidifying material of the present invention comprises 10
A mixture of a porous body having a specific surface area of 0 m ² / g or more and a powder metal is supported, and the powder metal is contained in the mixture in an amount of 30 to 80%.
It is characterized in that it is a dehumidifying material contained by mass%.

In a preferred embodiment of the dehumidifying material of the present invention, the dehumidifying material is a material in which the porous material is silica gel and the base material is selected from organic fibers, nonwoven fabrics of inorganic fibers, and metal foils.
It is characterized by being made of more than one kind of material.

In another preferred embodiment of the dehumidifying material of the present invention, the powder metal has a thermal conductivity of 100 W / m · K.
It is characterized by using the above powder metal.

Still another preferred form of the dehumidifying material of the present invention is that the powder metal has a particle size of 5 to 500.
It is in the range of μm.

[0014] In another preferred form of the dehumidifying material of the present invention, the amount of the mixture of the porous body and the powdered metal supported per volume of the substrate as the dehumidifying material is 65 to 271 kg /.
characterized in that it is a m ^3.

Further, the method for producing a dehumidifying material according to the present invention is a method for producing the above dehumidifying material, wherein the substrate or the substrate is processed into a treatment liquid obtained by adding powdered metal to an aqueous solution of alkali silicate and stirring and dispersing. The structure is immersed, and then acid-treated and dried.

Another preferred embodiment of the method for producing a dehumidifying material according to the present invention is characterized in that the alkali silicate aqueous solution has a solid concentration of 10 to 40% by mass.

Still another preferred embodiment of the method for producing a dehumidifying material according to the present invention is characterized in that the drying temperature is in the range of 50 to 150 ° C. during the drying treatment.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the dehumidifying material of the present invention will be described in detail.

The dehumidifying material of the present invention comprises a mixture of a porous body and a powdered metal supported on a substrate.

FIG. 1 shows a configuration example of the dehumidifying material of the present invention. The dehumidifying material 10 shown in FIG.
And the surface of the mixture of powder metal 14 is formed. By contacting the air to be dehumidified with such a structure, dehumidification performance can be effectively exhibited. That is, the porous body 12 has a function of reducing the humidity in the air by absorbing moisture in the air.
Has a high heat conduction function of lowering the temperature of the dehumidifying material that has been heated due to the absorption of moisture and has increased, and the temperature of the dehumidifying material that has increased due to the drying operation of the dehumidifying material during continuous operation.

Further, in the mixed state as shown in FIG. 1, the transfer of heat between the powder metal 14 and the porous body 12 is extremely good, and the thermal conductivity of the bulk as a composite material is extremely high.
Further, the powder metal 14 has a small effect of blocking the pores on the surface of the porous body 12 and lowering the adsorption / desorption capacity.

At this time, the porous body 12 has a specific surface area of 100
m ² / g or more. By using such a material having a high specific surface area, it is possible to secure a moisture absorption capacity for taking in water molecules in the air to be absorbed and to exhibit high dehumidification performance.

In the mixture of the porous body 12 and the powder metal 14, the content of the powder metal 14 is 3% based on the total weight thereof.
0 to 80% by mass. By setting the content in this range, the powder metal 14 is uniformly dispersed in the porous body 12 to exhibit high heat conduction characteristics, suppress a decrease in dehumidification performance during continuous use, and achieve high dehumidification performance over a long period of time. It can be maintained.

When the content of the powder metal 14 is less than 30% by mass, the distance between the particles of the powder metal 14 becomes large, so that the heat conduction characteristics become insufficient and the heat of the porous body 12 is dissipated. Effect is reduced. On the other hand, when the content of the powder metal 14 exceeds 80% by mass, the thickness of the matrix of the porous body 12 becomes thin, and it becomes impossible to secure an effective surface layer portion contributing to the adsorption of moisture, and the moisture absorption capacity rapidly increases. It becomes too small to obtain sufficient dehumidifying performance.

As such a porous body 12, silica gel is desirable. The porous body 12 of the present invention desirably has a function of adsorbing moisture in the air and a function of a binder capable of adhering to the base material 16. Silica gel is most suitable for the present invention as the porous body 12 in which the powder metal 14 can be dispersed in the raw material matrix, including the ease of synthesis. By using silica gel, the powder metal 14 is dispersed and gelled in the raw material solution in the dehumidifying material manufacturing stage,
The powder metal 14 can be taken into the gel matrix.

The substrate 16 is not particularly limited in terms of nonwoven fabric of organic fibers and inorganic fibers as long as it is conventionally used for a honeycomb structure for a dehumidifying element. For example, glass fibers, ceramic fibers, natural fibers, or the like can be used. A material obtained by collecting organic fibers such as polyester in a paper shape or a metal foil can be used. In particular, considering acid resistance at the time of manufacture, mechanical strength and durability as a honeycomb structure, and stability of shape, E
A nonwoven fabric made of glass fiber or silica alumina fiber is preferred.

The thickness and area density of this type of nonwoven fabric may be appropriately selected in consideration of the size of the target honeycomb body and the number of cells. For example, a nonwoven fabric made of glass fiber has a surface density of 10 to 10%. About 80 g / m ² and thickness 0.1 ~
It is preferably about 0.5 mm.

It is preferable to use a metal foil such as an aluminum foil as the base material 16 when the heat conduction characteristics are particularly taken into consideration because good heat conduction can be obtained as compared with the nonwoven fabric base material. Therefore, the nonwoven fabric substrate and the metal foil substrate may be appropriately selected depending on the application.

The shape of the base material 16 may be a sheet shape before working, or may be subjected to corrugating in advance and wound to form a honeycomb structure. When immersion impregnation of the dehumidifying material is performed in the form of a sheet, and then molding is performed, there is an advantage in production such as continuous immersion treatment, etc., and it may be appropriately selected according to the situation. .

When any of the substrates 16 is used, the heat capacity and the conduction characteristics of the dehumidifier itself, which is a mixture of the porous body 12 and the powdered metal 14, greatly affect the dehumidification performance.
The effect of the present invention is not changed by the difference of 6.

Further, the powder metal 14 has a thermal conductivity of 100 W
/ M · K or more. As a result, the heat conduction characteristics of the entire dehumidifying material are exhibited at a high level, and the dehumidifying performance can be maintained even in a long-term continuous operation.

The thermal conductivity of silica gel, which is an inorganic porous material, is 1 W / m · K or less, and the thermal conductivity of many metals is 10 W / m · K or more. Therefore, basically, as long as a powder metal having a thermal conductivity higher than that of silica gel is mixed, the heat transfer characteristics are improved. However, 100W / m · K
In the following cases, the thermal conductivity improvement effect of the powder metal is 100 W because the effect of improving the thermal conductivity by the powder metal compound is offset by the decrease in the surface area of the adsorbent and the dramatic improvement in the dehumidifying performance cannot be obtained.
/ M · K or more is desirable.

Further, the powder metal 14 has a particle size of 5 to 5.
It is preferably in the range of 500 μm. By being in this range, the heat conduction in the composite of the powdered metal 14 and the low heat conduction matrix has a heat conduction characteristic closer to the powdered metal 14 as a bulk as the metals are in direct contact or extremely close to each other. Obtainable. Therefore,
Better properties are obtained when the particles are agglomerated or unevenly distributed to some extent than when the powder metal 14 is well dispersed in the matrix.

Here, in the powder metal 14 in which the upper and lower limits of the particle size are defined by the two types of sieves, the intermediate point between the openings of the sieve is set as the average particle size for convenience. For the powder metal 14 in which the upper limit of the particle size is defined by one type of sieve, a point at 80% of the opening of the sieve is defined as the average particle size for convenience. The average particle diameter of the powder metal 14 whose approximate particle diameter is defined is defined as the average particle diameter.

Another aim of the present invention for studying the particle size is to improve the surface roughness of the dehumidifying material by blending the powder metal 14. That is, when the surface of the dehumidifying material 10 is roughened, the macroscopic surface area increases, and at the same time, there is an effect that the air diffusion near the dehumidifying material is disturbed to increase the diffusion speed of humidity in the airflow. In this sense, the powder metal 14 of the present invention needs to have a particle size within the range of the present invention that is sufficient to form the surface roughness.

There is no particular limitation on the powder metal 14 to be mixed and dispersed. The range of the metal having the above-described coefficient of thermal conductivity, including a single metal such as aluminum, copper, magnesium, gold, and silver, and alloys such as various aluminum alloys, is included. Can be arbitrarily selected, but surface properties such as surface treatment such as plating for corrosion prevention and surface treatment with a surfactant for improving dispersibility can be appropriately adjusted and used. Considering industrial application, it is preferable to use a relatively inexpensive powder metal 14 such as aluminum or copper and stable against chemical changes such as oxidation.

As long as the particle size of the powder metal 14 is within the above-mentioned range, it is not necessary to strictly adjust the particle size of the powder metal, and a powder metal having a particle size range that can be generally used can be used.
Even if impurities having a particle size of less than 5 μm are mixed as impurities, they do not particularly adversely affect the performance. To improve the thermal conductivity of the silica gel matrix.

In addition, the dehumidifying material 10 of the present invention is a porous material that is supported per volume of a substrate in consideration of actual use conditions.
2 and the powder metal 14 carry a mixture of 65 to 271 kg /
m ³ is desirable. Within this range, a small and high-performance dehumidifying material can be installed in the vehicle air conditioner, and the dehumidifying performance required for dehumidifying the interior of the vehicle compartment can be ensured.

As described above, the dehumidifying material 10 of the present invention uses a silica gel itself as a binder and adheres and fixes a composite dehumidifying material to a base material such as a nonwoven fabric or a metal foil without using a new binder as described above. Is what you do. For this purpose, a powder metal 14 is mixed at the stage of an alkali silicate solution during the production process of silica gel, a base material 16 such as a nonwoven fabric is immersed in the solution while stirring and dispersing, and a gel is formed by performing an acid treatment. The desired composite dehumidifier can be obtained by washing and removing the by-product salt after drying with water.

More specifically, the substrate 16 is immersed in a mixed dispersion of an alkali silicate and a powdered metal 14, taken out after the dispersion is sufficiently infiltrated, and if necessary, an excess processing solution is removed by air blowing or the like. Remove. Thereafter, an acid treatment for gel formation is performed. The acid used for the acid treatment may be an inorganic acid such as sulfuric acid or hydrochloric acid, or an organic acid, or a salt such as ammonium chloride that elutes an alkali from an alkali silicate, and then dried to obtain a dehumidifying material of the present invention. 10 is obtained.

The alkali silicate solid concentration of the alkali silicate solution is preferably 10 to 40% by mass. Sodium silicate, potassium silicate, lithium silicate and the like are used as the alkali silicate, and are used as an aqueous solution for silica gel production. By being in this range, the viscosity of the solution can be made appropriate, and the supporting of the dehumidifying material on the substrate 10 can be facilitated by one dipping. Further, the handling of the solution at the time of manufacture becomes easy.

In the present invention, the powder metal 14 is added to the alkali silicate and mixed and dispersed. However, the dispersion state of the powder metal 14 in the alkali silicate differs depending on the viscosity of the alkali silicate and the particle size of the powder metal. is necessary. For example, when an aluminum powder metal having a particle size range of about 60 to 100 μm is dispersed in a 30% by mass solution of sodium silicate in an amount of 100% (same amount) with respect to the solid content weight of sodium silicate, a substantially uniform dispersion is temporarily obtained. A solution is obtained, and it is desirable to appropriately adjust the concentration of sodium silicate according to the degree of stability of the dispersed state.
On the other hand, if a powder metal having a large particle diameter is used for the sol under the same conditions, the metal particles are aggregated and precipitated in a short time, and it is difficult to perform operations such as fixing to the substrate 16. Further, in order to improve the stability at the time of dispersion, a dispersion aid such as a surfactant may be appropriately added.

The drying temperature is preferably in the range of 50 to 150 ° C. By setting the content in this range, the drying time can be suppressed to an appropriate range, and appropriate pore formation of silica gel is brought about.

As a post-drying step, if necessary, in order to remove extra organic components such as when a dispersant is used for dispersing the powder metal 14, baking is performed at a temperature of, for example, about 300 to 500 ° C. You can do it too. If the amount of the dehumidifying material carried is not sufficient when the process from immersion to drying is performed once, a desired amount of carried can be obtained by repeating the process from immersion to drying.

Hereinafter, the present invention will be described in more detail with reference to Examples in order to clarify the effects of the present invention. However, the present invention is not limited to these Examples.

Example 1 30% by mass of No. 1 sodium silicate
Aluminum powder having an average particle size in the range of 60 to 100 μm (manufactured by Kojundo Chemical Laboratory Co., Ltd., product number ALE07) was added to the solution.
PA) was added at 100% by mass based on the weight of the solid content, and the mixture was stirred and dispersed to prepare a mixed solution.

As a substrate, a non-woven fabric made of E glass fiber (area density: 30 g / m ² , thickness: 0.2 mm) is corrugated, then wound, and wound into a 200 mm diameter, 50 mm thick sheet.
A 00 cell honeycomb structure was prepared. Next, the honeycomb structure made of E glass fiber was immersed in the mixed solution for 30 minutes while stirring the mixed solution.

Then, after the liquid was removed and air blow was performed, the substrate was immersed in a 5% sulfuric acid solution at room temperature for 30 minutes to perform an acid treatment. The honeycomb body taken out from the acid-treated sulfuric acid solution was washed with water and dried in a drying oven at 110 ° C. for 15 minutes.
The process from immersion in the treatment liquid to drying was repeated twice, and further baked at 400 ° C. for 1 hour to obtain a honeycomb dehumidifier.

In this example and the comparative example, the concentration of the treatment liquid and the number of repetitions of the immersion step were determined so that the amount of the dehumidifying material carried per honeycomb was in the range of 200 to 300 g.

[Examples 2 to 5 and 8 to 12] The honeycombs of Examples 2 to 5 and 8 to 12 were prepared according to the same procedure as in Example 1 and using the raw materials and the number of process repetitions shown in Table 1. did. In addition, the iron powder of Example 10 used the product number FEE02PA manufactured by Kojundo Chemical Laboratory Co., Ltd.

Example 6 In the same process as in Example 1, a polyester non-woven fabric was used as the base non-woven fabric, and the area density was 10 g /
m ² and a thickness of 0.2 mm were used. Further, since the polyester has poor heat resistance, the baking step at 400 ° C. was not performed.

Example 7 In the same manner as in Example 1, an aluminum foil having a thickness of 40 μm was used as a substrate. The step of immersion in the treatment liquid was repeated six times because the amount carried at one time was small.

[Comparative Examples 1 to 4] The honeycombs of Comparative Examples 1 to 4 were prepared according to the same procedure as in Example 1 by using the raw materials and the number of process repetitions shown in Table 1.

[Evaluation Method] Table 1 shows the specifications of the above Examples and Comparative Examples.

Table 2 shows the evaluation results of each specification.
The evaluation results shown in Table 2 were measured or calculated using the following methods.

(1) Metal content ratio: The theoretical content ratio was calculated from the input amounts of sodium silicate and powdered metal. At this time, the molecular formula of the sodium silicate used was Na ₂ O · 2.5SiO ₂ ,
Using a molecular weight of 212, the amount of the remaining silica gel after washing with water was set to 71% of the solid content of sodium silicate.

(2) Specific surface area: Before mixing sodium silicate with a metal, a gel is formed in another container, particularly in the same process as a dehumidifier for performance evaluation, according to JIS Z 8830.
The specific surface area was measured at room temperature using argon gas according to (Method for measuring specific surface area of powder by gas adsorption).

(3) Thermal conductivity: The thermal conductivity at room temperature was measured using a laser flash type thermal constant measuring instrument, model number FA8510B, manufactured by Rigaku Denki. In addition, since the sample was difficult to evaluate in the form of being supported on a nonwoven fabric, the treatment liquid was separately placed in a container, gelation was performed by mixing the acid treatment liquid, and a sample consisting only of silica gel and metal was prepared. . In addition, as a pretreatment of the sample, gold vapor deposition and carbon coating were performed on all sample surfaces to prevent measurement errors due to laser transmission.

(4) Carrying amount of dehumidifying material: The obtained honeycomb formed body was weighed.

(5) Dehumidification performance: A simple rotary dehumidifier was prepared for evaluating the dehumidification performance, and the dehumidification honeycombs prepared in Examples and Comparative Examples were incorporated. The assignment of the dehumidifying section, the regenerative heating section, and the cooling section of the honeycomb rotor was 240 degrees: 60 degrees: 60 degrees and the area ratio was 4: 1: 1. Dehumidified air is 25 ° C, 70% RH, cooling air is 25
° C, 50% RH, air for heating and regeneration is 1 air for cooling
It was used by heating to 00 ° C. The air flow rate was adjusted such that the linear velocity at the time of passing through the rotor was 0.5 m / sec. The rotation speed of the rotor is 1 rpm. And The steady operation was performed under such conditions, and the temperature and humidity before and after the dehumidified air passed through the dehumidification rotor for 5 minutes after the start of the operation were measured, and the dehumidification amount per hour was calculated from the difference in the absolute moisture amount.

(6) Others: The appearance of the obtained honeycomb and the presence or absence of abnormalities during the evaluation operation were examined.

[Evaluation Results] Examples 1 to 12 and Comparative Examples 1 to
Table 1 shows the evaluation results of No. 4. In Examples 1 to 12, a remarkable improvement in dehumidifying performance was obtained as compared with the conventional dehumidifying material containing no powder metal shown in Comparative Example 1. Here, 100 g / hr. Those with the above performance were considered to have good performance. Examples 8 and 12
Although the dehumidifying performance was good, silica gel and powder metal fell off during the evaluation test.

On the other hand, in Comparative Examples 1 to 4, although they were composite dehumidifiers containing metal powder, their compositions were not within a predetermined range, so that only performances substantially different from conventional products were obtained.

[0064]

[Table 1]

[0065]

[Table 2]

[0066]

As described above in detail, according to the present invention, a porous material, in particular, a mixture of silica gel and powdered metal is supported on a substrate, so that an adsorption type having high dehumidification efficiency is obtained. In obtaining a dehumidifying material for a dehumidifying device, heat conduction between the porous dehumidifying material and a high heat conducting material such as powdered metal can be ensured, so that the temperature of the dehumidifying material that has risen during the drying process in a continuous operation can be quickly reduced. Accordingly, it is possible to provide a dehumidifying material that can maintain the dehumidifying performance continuously and can be fixed to a substrate without concealing pores of the porous dehumidifying material, and a method for producing the same. Therefore, the dehumidifying material of the present invention is used, for example, to suitably control the humidity in the vehicle interior, and can provide a comfortable room by efficiently reducing the humidity in the vehicle interior particularly at high temperature and high humidity.

[Brief description of the drawings]

FIG. 1 is a schematic view showing the structure of a dehumidifying material according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Dehumidifying material 12 Porous body 14 Powder metal 16 Base material

Continued on front page F-term (Reference) 4D052 AA08 CB01 DA02 DA06 DB01 GA04 GB00 GB12 GB13 GB14 GB17 GB18 HA01 HA32 HA33 HA34 HA36 HA49 HB02 HB06 4G066 AA02C AA02D AA22B AA30A AA71C AC23C AE19C BA03 BA07 BA03 BA26 FA21 FA22 FA34 FA37 GA01 GA06

Claims (8)

[Claims] 1. A mixture of a porous material having a specific surface area of 100 m ² / g or more and a powder metal is supported on a base material, and the powder metal is contained in the mixture in an amount of 30 to 80% by mass. Characteristic dehumidifying material. 2. The dehumidifying material according to claim 1, wherein the porous body is silica gel, and the base material is at least one material selected from organic fibers, non-woven fabrics of inorganic fibers, and metal foils. . 3. The dehumidifying material according to claim 2, wherein a powder metal having a thermal conductivity of 100 W / m · K or more is used. 4. The dehumidifying material according to claim 3, wherein the powder metal has a particle size in a range of 5 to 500 μm. 5. The amount of the mixture of the dehumidifier and the powdered metal supported per volume of the substrate is 65 to 271 kg / m ^3.
The dehumidifying material according to any one of claims 1 to 4, wherein 6. A method for producing a dehumidifying material according to any one of claims 1 to 5, wherein a base material or a base material is added to a treatment liquid obtained by adding a powder metal to an aqueous solution of alkali silicate and stirring and dispersing it. A method for producing a dehumidifying material, comprising: immersing a structure obtained by processing a material, followed by acid treatment, and drying. 7. An alkali silicate aqueous solution having a solid concentration of 10%.
The method for producing a dehumidifying material according to claim 6, wherein the amount is in the range of from 40 to 40% by mass. 8. The method for producing a dehumidifying material according to claim 6, wherein the drying temperature is in the range of 50 to 150 ° C.