JP2024057201A - Adsorption member, adsorption rotor, and their manufacturing method - Google Patents

Abstract

The present invention provides an adsorption member and an adsorption rotor having high heat resistance, and methods for manufacturing the same.
[Solution] The present invention provides an adsorption member (10) comprising an adsorbent and a support substrate supporting the adsorbent, wherein the support substrate is a honeycomb structure comprising a flat substrate (11), a corrugated substrate (12), and an adhesive portion (13) thereof, and the adhesive portion (13) comprises a vinyl acetate-based polymer and/or a urethane-based polymer, and silica derived from base-stable colloidal silica.
[Selected Figure] Figure 1

Description

The present invention relates to an adsorption member, an adsorption rotor, and a method for manufacturing the same.

For example, dry air from which moisture has been removed is used at manufacturing sites such as semiconductor manufacturing plants. As a device for supplying dry air, an adsorption rotor equipped with an adsorption member in which an adsorbent such as silica gel is supported on a honeycomb structure, as described in Patent Document 1, is known.

The adsorption member described in Patent Document 1 adsorbs moisture from high humidity air in the treatment zone of the adsorption rotor, and is heated in the regeneration zone to release the adsorbed moisture. The rotating adsorption rotor passes the adsorption member through the treatment zone and the regeneration zone, thereby continuously adsorbing and obtaining dry air.

The honeycomb structure is formed into a cylindrical shape by bonding a flat substrate and a corrugated substrate with an adhesive and rolling them up. The adsorption member is manufactured by cutting the cylindrical honeycomb structure into several pieces, drying the resulting raw elements, and then supporting the adsorbent on them.

In Patent Document 2, a honeycomb structure is formed by bonding a flat substrate and a corrugated substrate with an adhesive containing an acrylic emulsion and colloidal silica. The raw elements of the honeycomb structure are then immersed in a sodium silicate solution and subjected to an acid treatment to produce an adsorption member in which silica gel is supported on the honeycomb structure.

Japanese Patent Application Laid-Open No. 61-252497 JP 2021-181072 A

The present invention aims to provide a highly heat-resistant adsorption member, an adsorption rotor, and a method for manufacturing the same.

The present inventors have found that the above problems can be solved by the present invention having the following aspects.
<<Aspect 1>>
An adsorption member including an adsorbent and a support substrate supporting the adsorbent,
The support substrate is a honeycomb structure including a flat substrate, a corrugated substrate, and an adhesive portion thereof, and the adhesive portion includes a vinyl acetate-based polymer and/or a urethane-based polymer, and silica derived from base-stable colloidal silica.
Aspect 2
2. The adsorption member according to claim 1, wherein the adhesive portion contains the vinyl acetate polymer and/or the urethane polymer in an amount of 20% by mass or more and the silica in an amount of 80% by mass or less.
Aspect 3
2. The adsorptive member of claim 1, wherein the flat substrate and/or the corrugated substrate comprises mixed paper.
Aspect 4
2. The adsorbent of claim 1, wherein the adsorbent is silica gel.
Aspect 5
5. The adsorptive member of claim 4, wherein the base-stabilized colloidal silica is ammonium ion-stabilized colloidal silica.
Aspect 6
An adsorption rotor comprising the adsorption member according to any one of aspects 1 to 5.
Aspect 7
An air treatment device comprising the adsorbent member according to any one of aspects 1 to 5.
Aspect 8
An air treatment method comprising contacting air containing a non-adsorbable substance with the adsorption member according to any one of Aspects 1 to 5.
Aspect 9
applying an adhesive to a flat and/or corrugated substrate;
A step of obtaining a honeycomb structure by winding the two substrates coated with the adhesive or stacking a plurality of the two substrates; and a step of supporting an adsorbent on the flat substrate and/or the corrugated substrate.
Including,
The method for producing an adsorption member, wherein the adhesive comprises an emulsion of a vinyl acetate polymer and/or a urethane polymer, and base-stable colloidal silica.
Aspect 10
10. The method according to claim 9, wherein the adhesive contains 20% by mass or more of the vinyl acetate polymer and/or urethane polymer emulsion in terms of solid content, and 80% by mass or less of the base-stable colloidal silica in terms of solid content.
Aspect 11
A manufacturing method according to aspect 9 or 10, wherein the step of supporting the adsorbent includes the steps of applying sodium silicate to the honeycomb structure and subjecting the honeycomb structure to which the sodium silicate has been applied to an acid treatment.

The present invention provides an adsorption member and an adsorption rotor with high heat resistance, and a method for manufacturing the same.

FIG. 1 shows an example of an adsorption rotor 100 including an adsorption member 10 of the present invention. FIG. 2 shows an example of a method for producing an adsorption member according to the present invention. FIG. 3 shows the evaluation of adhesive strength in the examples.

<<Adsorption member and adsorption rotor>>
The adsorption member of the present invention includes an adsorbent and a support substrate supporting the adsorbent, wherein the support substrate is a honeycomb structure including a flat substrate, a corrugated substrate, and an adhesive portion thereof, and the adhesive portion includes a vinyl acetate polymer and/or a urethane polymer, and silica derived from base-stable colloidal silica.

After extensive research, the inventors have found that by changing the acrylic emulsion in the adsorption member described in Patent Document 2 to a vinyl acetate polymer and/or a urethane polymer, and by changing the colloidal silica from the acidic colloidal silica that has been used conventionally to base-stable colloidal silica, an adsorption member with higher heat resistance than the adsorption member described in Patent Document 2 can be formed. In addition, it has been found that such an adhesive has high storage stability and high adhesive strength, and as a result, can provide the adsorption member with high mechanical strength.

Without being bound by theory, in the adhesive using an acrylic emulsion as described in Patent Document 2, the ester groups in the side chains of the acrylic polymer are hydrolyzed during the acid treatment process to generate decomposition products, whereas in the case of vinyl acetate polymers and/or urethane polymers, the side chains are not decomposed, and therefore no polymer decomposition products are generated. It is believed that the presence or absence of polymer-derived decomposition products is responsible for the high heat resistance of the adsorption member of the present invention. Due to its structure, the honeycomb structure is prone to heat accumulation, and it is believed that the presence or absence of polymer-derived decomposition products affects heat resistance, especially when the adsorption rotor has stopped rotating. The generation of decomposition products from acrylic polymers was suggested by the present inventors' analysis using infrared spectroscopy.

Figure 1 illustrates an adsorption rotor 100 including an adsorption member 10. The adsorption rotor 100 includes the adsorption member 10 and a separator 20 that separates the adsorption member 10 into a treatment zone 10a and a regeneration zone 10b, and the adsorption member 10 can be rotated by the adsorption rotor 100. The adsorption member 10 includes an adsorbent (not shown) and a support substrate that supports the adsorbent, and the support substrate is a honeycomb structure that includes a flat substrate 11, a corrugated substrate 12, and an adhesive portion 13 between them. The honeycomb structure has an air passage 14 between the flat substrate 11 and the corrugated substrate 12.

The adsorption rotor 100 may have other configurations known in the art, and may have, for example, a casing for storing the adsorption member 10 and a rotation mechanism for rotating the adsorption member 10, although these are not shown. The adsorption rotor 100 may have multiple divided bodies of the adsorption member 10.

An external air flow 1 containing moisture passes through the processing zone 10a of the adsorption member 10, where it is processed into a dry air flow 2 and supplied to a place where dry air is used, such as a clean room. The adsorption member 10, which has adsorbed moisture in the processing zone 10a, moves to the regeneration zone 10b by rotating in the adsorption rotor 100, where it is exposed to a high-temperature air flow 3, causing the adsorption member 10 to desorb moisture and move back to the processing zone 10a. The high-temperature air flow 3, which has desorbed moisture from the adsorption member 10 by passing through the regeneration zone 10b of the adsorption member 10, becomes an air flow 4 containing moisture.

<Adsorbent>
In the adsorption member of the present invention, an adsorbent is supported on a honeycomb structure. Here, the adsorbent may be a physical adsorbent or a chemical adsorbent, for example, a dehumidifier for adsorbing moisture, or an adsorbent for adsorbing volatile organic compounds. The specific type of adsorbent is not particularly limited, and examples thereof include inorganic adsorbents such as calcium oxide, magnesium sulfate, calcium chloride, aluminum oxide, quicklime, silica gel, and zeolite; and organic adsorbents such as polyacrylates and alkylene oxide resins. In particular, silica gel can be used.

The adsorbent may be attached to the surface of the support substrate, or may be supported inside the substrate if the support substrate is fibrous or porous.

<Support Substrate>
The support substrate is a honeycomb structure including a flat substrate, a corrugated substrate, and an adhesive portion thereof. As long as the advantageous effects of the present invention are obtained, the flat substrate does not have to be substantially flat, the corrugated substrate does not have to have a wavy shape, and the honeycomb structure does not have to be honeycomb shaped. The adhesive portion between the flat substrate and the corrugated substrate does not have to be limited to the position shown in FIG. 1. These terms can have various shapes within the range known as the terms used in this field.

<Supported Substrate-Substrate>
As the substrate of the flat substrate and/or the corrugated substrate, a film, a woven or nonwoven fabric, a metal foil, a foam, paper, etc. can be used, and in particular, a paper substrate containing fibers can be used. Examples of the fibers contained in the paper substrate include inorganic fibers such as silica-alumina fibers, silica fibers, alumina fibers, mullite fibers, glass fibers, rock wool fibers, and carbon fibers; and organic fibers such as polyethylene fibers, polypropylene fibers, nylon fibers, polyester fibers, polyvinyl alcohol fibers, polyethylene terephthalate fibers, aramid fibers, pulp fibers, and rayon fibers. In addition, these fibers may be one type or a combination of two or more types, and may be a combination of inorganic fibers and organic fibers. In addition, the flat substrate and the corrugated substrate may use the same fibers or different fibers.

The paper-like substrate may be composed only of the above-mentioned fibers, or may be a substrate containing 80% by mass or more, 90% by mass or more, or 95% by mass or more of the above-mentioned fibers.

In the present invention, mixed paper containing hygroscopic particles can be used as the substrate for the flat substrate and/or the corrugated substrate.

It was found that when mixed paper is used, the hygroscopic particles quickly dry out the adhesive when bonding the flat substrate and the corrugated substrate, resulting in a weak adhesive strength. In this case, after the honeycomb structure is manufactured, the adhesion between the flat substrate and the corrugated substrate may peel off during the process of dividing the structure into multiple pieces, resulting in problems with handling. In the present invention, the adhesive has a high adhesive strength, so it was found that the adhesion between the flat substrate and the corrugated substrate is less likely to peel off even when mixed paper is used.

In this specification, the mixed paper refers to a paper-like base material in which hygroscopic particles such as silica gel, zeolite, silica-alumina amorphous porous body, mesoporous silica, ion exchange resin, polyacrylate resin, alkylene oxide resin, etc. are pre-woven into the gaps between the fibers as described above. The mixed paper is produced by forming a fiber solution in which hygroscopic particles are dispersed into a paper-like form. The type of silica gel may be appropriately selected depending on the purpose. For example, type A, which has excellent hygroscopic power at low humidity, or type B, which has excellent hygroscopic power at high humidity, may be selected depending on the purpose. Alternatively, type A and type B silica gel may be mixed.

The hygroscopic particles contained in the mixed paper are aggregated in the gaps between the fibers during the manufacturing process. On the other hand, if the adsorbent is, for example, silica gel, the silica gel is formed by treating the sodium silicate impregnated in the honeycomb structure with acid. In this case, the amount of voids in the hygroscopic particles contained in the mixed paper is greater than the amount of voids in the silica gel formed in the ventilation part of the honeycomb structure. Here, the "amount of voids" is different from the specific surface area that represents the surface area of the pores inside the hygroscopic particles, and means the amount of voids formed between the particles per unit volume. The "amount of voids" can be measured by photographing the particles using an SEM or the like and comparing the apparent roughness. The more randomly the particles are aggregated, the greater the "amount of voids" will be, and the rougher the SEM image will look (fine unevenness will be observed). On the other hand, the smaller the "amount of voids", the denser the particles will be formed, and the smoother the SEM image will look.

In addition, the "amount of voids" does not mean the amount of gaps between individual particles, but the amount of voids (apparent roughness or smoothness) in an area where a specified amount of particles are aggregated. An area where a specified amount of particles are aggregated means any area where particles are aggregated as viewed in an SEM image. Therefore, the area does not include cracks formed on the surface. In other words, the area does not mean the entire surface observed in an SEM image, but simply the part where particles are aggregated.

The difference between the hygroscopic particles contained in the mixed paper and the silica gel adsorbent may be expressed using the terms "surface smoothness,""surfaceproperties," or "surface roughness" instead of "amount of voids." The difference between the hygroscopic particles contained in the mixed paper and the silica gel as viewed from an SEM image may be expressed as follows:
- Hygroscopic particles with an uneven surface formed by agglomeration of granules, and block-shaped silica gel with a relatively flat surface.
- Hygroscopic particles with a rough surface and synthetic silica gel with a smooth surface.

The mixed paper may contain 50% by mass or more, 60% by mass or more, 70% by mass or more, or 80% by mass or more of the above-mentioned hygroscopic particles, and 90% by mass or less, 80% by mass or less, 70% by mass or less, or 60% by mass or less. The mixed paper may contain 10% by mass or more, 20% by mass or more, 30% by mass or more, or 40% by mass or more of the above-mentioned fibers, and 50% by mass or less, 40% by mass or less, 30% by mass or less, or 20% by mass or less. For example, the mixed paper may contain 50% by mass or more and 90% by mass or less of the hygroscopic particles and 10% by mass or more and 50% by mass or less of the fibers.

The basis weight of the flat substrate and/or the corrugated substrate may be 10 g/m ² or more, 30 g/m ² or more, or 50 g/m ² or more, and 100 g/m ² or less, 50 g/m ² or less, or 30 g/m ² or less. In particular, when the substrate is a paper substrate that does not contain hygroscopic particles, the basis weight may be 10 g/m ² or more, 15 g/m ² or more, or 20 g/m ² or more, and 50 g/m ² or less, 30 g/m ² or less, or 20 g/m ² or less. In addition, when the substrate is a mixed paper, the basis weight may be 50 g/m ² or more, 60 g/m ² or more, or 80 g/m ² or more, and 100 g/m ² or less, 90 g/m ² or less, or 80 g/m ² or less.

The thickness of the flat substrate and/or the corrugated substrate may be 50 μm or more, 100 μm or more, or 200 μm or more, and may be 500 μm or less, 300 μm or less, or 200 μm or less. In particular, when the substrate is a paper substrate that does not contain hygroscopic particles, the thickness may be 50 μm or more or 80 μm or more, and may be 200 μm or less, 150 μm or less, or 120 μm or less. In addition, when the substrate is a mixed paper, the thickness may be 100 μm or more or 150 μm or more, and may be 300 μm or less, 250 μm or less, or 200 μm or less.

<Support substrate-adhesive part>
The adhesive portion between the flat substrate and the corrugated substrate contains a vinyl acetate polymer and/or a urethane polymer, and silica derived from base-stable colloidal silica.

It has been found that high heat resistance can be obtained when vinyl acetate polymers and/or urethane polymers are used in the adhesive portion. Without being limited to theory, it is believed that when an adsorption member is heated for a long period of time, polymer decomposition products are generated, but when vinyl acetate polymers and/or urethane polymers are used in the adhesive portion, even if an acid treatment is performed to produce silica gel, the side chains do not decompose, so no polymer decomposition products are generated and high heat resistance can be obtained.

The vinyl acetate polymer and/or urethane polymer may be derived from an emulsion, in which case the pH of the emulsion may be 3.0 or more, 4.0 or more, or 5.0 or more, and 8.0 or less, 7.0 or less, or 6.0 or less. For example, the emulsion of the vinyl acetate polymer and/or urethane polymer may be 4.0 or more and 7.0 or less. When the pH is in such a range, the adhesive obtained by mixing the base-stable colloidal silica and the emulsion has high storage stability.

Vinyl acetate-based polymers can be polymerized from a monomer composition that includes vinyl acetate and, optionally, ethylene, which can further include other monomers.

Other copolymerizable monomers include, for example, vinyl chloride, vinyl propionate, vinyl versatate, acrylic acid, methacrylic acid, maleic acid, itaconic acid, ethyl acrylate, propyl acrylate, N-vinylpyrrolidone, styrene, acrylonitrile, (meth)acrylamide, etc.

The polymerization of vinyl acetate-based polymers can be carried out, for example, by emulsion polymerization. Thus, the vinyl acetate-based polymer may be an emulsion of vinyl acetate polymer or ethylene-vinyl acetate copolymer.

In ethylene-vinyl acetate copolymers, the ratio of ethylene, vinyl acetate and other monomers by mass may be 5-40:40-95:0-20, for example 10-35:90-50:0-15.

As the urethane-based polymer, a urethane-based polymer used as an adhesive can be used. Examples of such adhesives include a urethane-based polymer adhesive, a urethane-based polymer solvent-based adhesive, and a urethane-based polymer emulsion adhesive. Examples of the urethane-based polymer include polyester urethane, polyether urethane, and silylated polyurethane.

The adhesive portion may contain 20% by mass or more, 25% by mass or more, 30% by mass or more, 35% by mass or more, or 40% by mass or more of vinyl acetate-based polymer and/or urethane-based polymer, and 60% by mass or less, 55% by mass or less, 50% by mass or less, or 45% by mass or less. For example, the adhesive portion may contain 20% by mass or more and 60% by mass or less, or 30% by mass or more and 50% by mass or less of vinyl acetate-based polymer and/or urethane-based polymer. It has been found that these polymers are unlikely to generate decomposition products even when exposed to heat for a long period of time, and therefore a large amount of polymer can be contained in the adhesive portion, thereby providing high adhesive strength.

The silica in the adhesive is derived from base-stabilized colloidal silica. Examples of base-stabilized colloidal silica include lithium ion-stabilized colloidal silica, sodium ion-stabilized colloidal silica, potassium ion-stabilized colloidal silica, and ammonium ion-stabilized colloidal silica, with sodium ion-stabilized colloidal silica and ammonium ion-stabilized colloidal silica being particularly preferred.

Among these, ammonium ion-stabilized colloidal silica is particularly advantageous in semiconductor-related fields because it does not contain metal ions. Ammonium ion-stabilized colloidal silica is also suitable for use when silica gel is used as an adsorbent. Silica derived from ammonium ion-stabilized colloidal silica does not retain the relatively large amount of sodium derived from sodium ion-stabilized colloidal silica, and the pH of the extract is higher than that of acidic colloidal silica. Also, trace amounts of ammonium ions may be detected in the extract.

The ammonium ion type colloidal silica preferably contains colloidal silica containing ammonia as a dispersant. Colloidal silica stabilized with NH4 ⁺ ions (ammonia stabilized type) is commercially available, for example, Snowtex ST-NXS, ST-NS, ST-N, ST-N30, ST-N40, etc., manufactured by Nissan Chemical Industries, Ltd.

The adhesive portion may contain 35% by mass or more, 40% by mass or more, 45% by mass or more, 50% by mass or more, or 55% by mass or more of the silica, and 80% by mass or less, 75% by mass or less, 70% by mass or less, 65% by mass or less, or 60% by mass or less. For example, the adhesive portion may contain 40% by mass or more and 70% by mass or less, or 45% by mass or more and 65% by mass or less of the silica.

The mass ratio of the vinyl acetate polymer and/or urethane polymer to silica in the adhesive joint (polymer/silica) can be 0.30 or more and 1.50 or less, 0.50 or more and 1.20 or less, or 0.70 or more and 1.0 or less.

The adhesive portion may further contain components derived from tackifiers, plasticizers, curing agents, crosslinking agents, diluents, fillers, thickeners, pigments, antioxidants, antioxidants, defoamers, flame retardants, preservatives, dispersants, wetting agents, hydrophilizing agents, etc.

<<Method of manufacturing adsorption member and adsorption rotor>>
The method for manufacturing an adsorption member of the present invention includes the steps of applying an adhesive to a flat substrate and/or a corrugated substrate, obtaining a honeycomb structure by winding the two substrates to which the adhesive has been applied or by stacking a plurality of the two substrates, and supporting an adsorbent on the flat substrate and/or the corrugated substrate, the adhesive including an emulsion of a vinyl acetate polymer and/or a urethane polymer and base-stable colloidal silica.The method for manufacturing an adsorption rotor includes combining an adsorption member that is rotatably held, and a separator that separates the adsorption member into a treatment zone and a regeneration zone.

The adsorption member and adsorption rotor obtained by the manufacturing method of the adsorption member and adsorption rotor of the present invention may be the adsorption member and adsorption rotor of the present invention described above. For each configuration related to the manufacturing method of the adsorption member and adsorption rotor of the present invention, reference may be made to each configuration described above regarding the adsorption member and adsorption rotor of the present invention.

Figure 2 shows an example of a method for manufacturing an adsorbent member of the present invention. In this manufacturing method, in step (a), a flat substrate is prepared. When mixed paper is used as the substrate, the substrate contains hygroscopic particles at this stage. In the manufacturing method of the present invention, the hygroscopic particles can be the same substance as the adsorbent described below, but are referred to as being different from the adsorbent.

In step (b), the flat substrate is corrugated to produce a corrugated substrate. When corrugating, an adhesive is applied to the wave-shaped peaks of the corrugated substrate and the corrugated substrate is bonded to the flat substrate to obtain a laminate of the corrugated substrate and the flat substrate.

Here, the adhesive contains an emulsion of a vinyl acetate polymer and/or a urethane polymer and base-stable colloidal silica, and can be an adhesive used to form the adhesive part of the adsorption member of the present invention. Therefore, the configuration of the adhesive can be determined by reference to the configuration of the adhesive part.

In step (c), the laminate of two substrates, a flat substrate and a corrugated substrate, is wound. This makes it possible to obtain a cylindrical honeycomb structure in which flat substrates and corrugated substrates are alternately laminated, as shown in FIG. 1. The adsorption member obtained by the method shown in FIG. 2 is a rolled laminate of two substrates, a flat substrate and a corrugated substrate, but when obtaining a rectangular parallelepiped adsorption member, it can be obtained by alternately laminating flat substrates and corrugated substrates of a predetermined size. In this case, it is necessary to mainly change steps (c) and (d).

In step (d), the cylindrical honeycomb structure can be cut into a plurality of honeycomb structures. In this case, it is preferable that the adhesive portion bonds the flat substrate and the corrugated substrate with a strong adhesive force.

In step (e), a honeycomb structure, also called a raw element, is obtained before the adsorbent is loaded.

In step (f), an adsorbent is loaded onto the raw element obtained in step (e). Here, the raw element is immersed in a sodium silicate solution. This also improves the adhesion between the flat substrate and the corrugated substrate.

The sodium silicate solution can be prepared by dissolving commercially available sodium silicate in water. In order to support the desired amount of adsorbent and prevent the ventilation parts of the honeycomb structure from becoming clogged, the concentration of the sodium silicate solution can be, for example, 20 to 50 mass%, preferably 25 to 45 mass%, and more preferably 30 to 40 mass%.

In step (g), the raw element to which sodium silicate has been applied is subjected to an acid treatment to synthesize the adsorbent silica gel.

The acid used in the silica gel synthesis process is not particularly limited as long as it can synthesize silica gel from the sodium silicate solution. Examples of acids include sulfuric acid, phosphoric acid, nitric acid, hydrochloric acid, and metal salts of these acids, such as aluminum salts such as aluminum sulfate and aluminum nitrate, calcium salts such as calcium nitrate and calcium chloride, magnesium salts such as magnesium sulfate and magnesium chloride, and iron salts such as ferrous sulfate and ferrous nitrate. The acids and metal salts of the acids may be used alone or in combination.

The silica gel synthesized may be type A or type B. It can be synthesized to the desired type depending on the purpose by changing the concentration of the acid treatment, etc. When synthesizing silica gel from a sodium silicate solution, if an aluminum salt is used as the acid, silica alumina gel is obtained. In this specification, when the term "synthetic silica gel" is used, it also includes silica gel containing a metal salt derived from an acid.

In step (h), the raw element carrying the silica gel is washed with water or the like and then dried to obtain the adsorption member in step (i).

The steps shown in FIG. 2 are an example of a preferred embodiment of the manufacturing method of the present invention, and are not limited to this order as long as the advantageous effects of the present invention are obtained. In addition, not all of the steps described above are necessary, and some steps may not be performed depending on the embodiment of the adsorption member to be manufactured.

Air Treatment Device and Air Treatment Method
The present invention further relates to an air treatment device comprising the above-mentioned adsorption member. The air treatment device of the present invention can have the well-known configuration of a typical air treatment device used in a home or factory, such as a dehumidifier, air purifier, VOC treatment device, etc., except for including the above-mentioned adsorption member.

The present invention further relates to an air treatment method that includes contacting air containing non-adsorbable substances with the adsorption member described above. Except for using the adsorption member described above, the air treatment device of the present invention can have a well-known configuration of a typical air treatment method used in homes or factories, such as a dehumidification method, an air purification method, a VOC treatment method, etc. Examples of non-adsorbable substances include moisture, volatile organic compounds, etc.

The present invention will be described in more detail in the following examples, but is not limited thereto.

Example of production:
Comparative Example 1: Conventional Example
An adhesive of Comparative Example 1 was prepared containing 13.5% by weight of an acrylic emulsion (3M, JA-7562), 86.3% by weight of acidic colloidal silica (Nissan Chemical Co., Ltd., ST-O-40), 0.1% by weight of xanthan gum (CP Kelco, Kelzan) as a thickener, and 0.1% by weight of a silicone emulsion (Shin-Etsu Chemical Co., Ltd., KM-71) as an antifoaming agent. This adhesive contained 20% by weight of polymer and 80% by weight of silica in terms of solids.

A cylindrical honeycomb structure having a diameter of 500 mm and a height of 400 mm was manufactured using the above adhesive and a mixed paper as a substrate. The mixed paper contained 65% by mass of silica gel (A-type silica gel, Silica 740 manufactured by Fuji Silysia Chemical), 15% by mass of glass fiber, and 20% by mass of organic fiber, and had a basis weight of 83 g/ ^m2 and a thickness of 197 μm.

The cylindrical honeycomb structure was then cut in half. This was then immersed in sodium silicate, acid-treated with aluminum sulfate, washed with water, and dried to produce the adsorption member of Example 1.

Comparative Example 2
An adhesive of Comparative Example 2 was prepared containing 15.5% by weight of an ethylene-vinyl acetate emulsion (Sumikaflex 400HQ, Sumika Chemtex Corporation), 84.3% by weight of acidic colloidal silica (ST-O-40, Nissan Chemical Industries, Ltd.), 0.1% by weight of xanthan gum (Kelzan, CP Kelco) as a thickener, and 0.1% by weight of a silicone emulsion (KM-71, Shin-Etsu Chemical Co., Ltd.) as a defoamer. This adhesive contained 20% by weight of polymer and 80% by weight of silica in terms of solids.

After that, we tried to manufacture an adsorption member in the same manner as in Comparative Example 1, but the viscosity of the adhesive became high and it was not possible to apply the adhesive uniformly, so we did not manufacture an adsorption member.

Example 1
An adhesive of Example 1 was prepared containing 12.0% by weight of an ethylene-vinyl acetate emulsion (Sumikaflex 400HQ, Sumika Chemtex Corporation), 87.8% by weight of ammonium ion-type colloidal silica (ST-N-30, Nissan Chemical Industries, Ltd.), 0.1% by weight of xanthan gum (Kelzan, CP Kelco) as a thickener, and silicone emulsion (KM-71, Shin-Etsu Chemical Co., Ltd.) as a defoamer. This adhesive contained 20% by weight of polymer and 80% by weight of silica in terms of solid content.

Then, the adsorption member was manufactured in the same manner as in Comparative Example 1.

Example 2
An adhesive according to Example 1 was prepared containing 29.9% by weight of an ethylene-vinyl acetate emulsion (Sumikaflex 400HQ, Sumika Chemtex Corporation), 69.9% by weight of ammonium ion-type colloidal silica (ST-N-30, Nissan Chemical Industries, Ltd.), 0.1% by weight of xanthan gum (Kelzan, CP Kelco) as a thickener, and silicone emulsion (KM-71, Shin-Etsu Chemical Co., Ltd.) as an antifoaming agent. This adhesive contained 44% by weight of polymer and 56% by weight of silica on a solids basis.

Then, the adsorption member was manufactured in the same manner as in Comparative Example 1.

"evaluation"
<Heat storage test>
A thermocouple was installed at a position 110 mm above the center of the adsorption member divided in half (i.e., a position 1/4 of the diameter away from the center of the circular plane of the cylinder and at the center in the height direction) in the height direction, and the temperature change was measured when the adsorption member was placed in a furnace at 150° C. As a result, the results of Example 1 were almost the same as those of Example 2, and no increase in temperature was observed.

Tensile strength test
A tensile strength test was carried out on the honeycomb structure (raw element) before the silica gel was produced, and on the final moisture-absorbing member, to evaluate the adhesive strength of the adhesive joint.

The tensile strength was measured as follows:
(1) The adsorption member is cut into a 5 ^cm3 cube parallel to the lamination direction to obtain a test specimen for measuring tensile strength.
(2) The test specimen is dried at 110° C. for 1 hour, and its weight is measured using an electronic balance. The lengths of the three sides are measured using vernier calipers.
(3) Using an epoxy adhesive, tensile test jigs are attached to the top and bottom of the honeycomb structure of the test specimen in the lamination direction.
(4) The test specimen is attached to a tensile testing machine (Shimadzu Corporation, Shimadzu Corporation small benchtop testing machine Ez-LX), and a tensile load is continuously applied to the test specimen at 1 mm/min, and the load at break is determined to the nearest 1 N.
(5) The tensile strength in the lamination direction is calculated by the following formula:
σ=F/(A×B)
(where σ is tensile strength [N/cm ² ], F is the load at the time of breaking of the test specimen [N], dimension A of the test specimen [cm], and dimension B of the test specimen [cm]).

The results are shown in Figure 3. Figure 3(a) shows the tensile strength results for the raw element, and Figure 3(b) shows the tensile strength results for the final product.

As is clear from Figure 3, Example 2 had higher adhesive strength than Comparative Example 1, both in the raw element state and in the final product state. Note that Example 1 had the same level of adhesive strength as Comparative Example 1.

Storage stability test
The adhesives of Comparative Example 1 and Examples 1 and 2 were allowed to stand at room temperature, and a test was carried out to determine whether the stable dispersion state of the colloidal silica was maintained.

As a result, the adhesive of Comparative Example 1 became unusable as an adhesive after about two days due to the silica in the colloidal silica agglomerating and precipitation. On the other hand, the adhesives of Examples 1 and 2 were able to maintain the silica in the colloidal silica in a dispersed state even after one week had passed.

Reference Signs List 1 Moist air flow 2 Dry air flow 3 Hot air flow 4 Moist air flow 10 Adsorption member 10a Treatment zone 10b Regeneration zone 11 Flat substrate 12 Corrugated substrate 13 Bonding section 14 Ventilation section 100 Adsorption rotor

Claims (11)

An adsorption member including an adsorbent and a support substrate supporting the adsorbent,
The support substrate is a honeycomb structure including a flat substrate, a corrugated substrate, and an adhesive portion thereof, and the adhesive portion includes a vinyl acetate-based polymer and/or a urethane-based polymer, and silica derived from base-stable colloidal silica. The adsorption member according to claim 1, wherein the adhesive portion contains 20% by mass or more of the vinyl acetate polymer and/or the urethane polymer, and 80% by mass or less of the silica. The adsorption member according to claim 1, wherein the flat substrate and/or the corrugated substrate includes mixed paper. The adsorption member according to claim 1, wherein the adsorbent is silica gel. The adsorption member according to claim 4, wherein the base-stabilized colloidal silica is ammonium ion-stabilized colloidal silica. An adsorption rotor comprising an adsorption member according to any one of claims 1 to 5. An air treatment device comprising the adsorption member according to any one of claims 1 to 5. An air treatment method comprising contacting air containing a non-adsorbable substance with the adsorption member according to any one of claims 1 to 5. applying an adhesive to a flat and/or corrugated substrate;
A step of obtaining a honeycomb structure by winding the two substrates coated with the adhesive or stacking a plurality of the two substrates; and a step of supporting an adsorbent on the flat substrate and/or the corrugated substrate.
Including,
The method for producing an adsorption member, wherein the adhesive comprises an emulsion of a vinyl acetate polymer and/or a urethane polymer, and base-stable colloidal silica. The manufacturing method according to claim 9, wherein the adhesive contains 20% by mass or more of the vinyl acetate polymer and/or urethane polymer emulsion in terms of solid content, and 80% by mass or less of the base-stable colloidal silica in terms of solid content. 11. The manufacturing method according to claim 9, wherein the step of supporting the adsorbent includes the steps of applying sodium silicate to the honeycomb structure, and subjecting the honeycomb structure to which the sodium silicate has been applied to an acid treatment.