Method for manufacturing condensation stopping member from sponge and condensation stopping material using porous material, hyaluronic acid, and polyvinyl alcohol

Abstract

Provided is a condensation stopping member that is capable of absorbing and releasing humidity in a wide humidity range by using a porous material, has particularly high humidity adsorption performance in a medium to high humidity region, and requires no air circulation by a fan or the like.　A (water-absorbing) sponge is immersed in an aqueous slurry obtained by mixing a porous material powder, hyaluronic acid, water, and polyvinyl alcohol, and the sponge is impregnated with the water-based slurry by vibration and then dried to cause a condensation stopping material mainly composed of the porous material to be held in the pores of the sponge.　The condensation stopping member is capable of stopping condensation by adjusting the humidity in the air by absorbing / releasing moisture in the air by the circulation of air in the pores of the sponge.

Description

Condensation-stopping material made of porous material, hyaluronic acid, and polyvinyl alcohol, and a method for manufacturing a condensation-stopping member made of sponge

[0001] The present invention relates to a condensation-stopping material made of a porous material, hyaluronic acid, and polyvinyl alcohol, and a method for manufacturing a condensation-stopping member made of a sponge, for stopping and preventing condensation that occurs in agricultural greenhouses and the like.

[0002] Condensation occurs inside agricultural greenhouses due to temperature and humidity, and water droplets from the condensation cause crop rot and mold growth, resulting in problems such as reduced crop yields. High temperatures and humidity in summer and condensation in winter are major problems in agriculture, and various dehumidifiers have been investigated to remove humidity and prevent condensation. However, while current dehumidifiers and condensation prevention materials have the function of adjusting humidity and dehumidifying, none are effective enough to stop condensation from occurring. Furthermore, many dehumidifiers and condensation prevention materials require air circulation to absorb humidity, which means that their humidity absorption effect is low in spaces with poor air circulation or large spaces.

[0003] In this context, porous inorganic materials with nano-sized pores have the moisture adsorption properties based on their unique microstructure, and are therefore expected to be used as anti-condensation materials. There is also hope for the development of anti-condensation materials that do not require airflow.

[0004] In the above technical fields, Patent Documents 1 and 2 disclose a method of using a porous metal oxide such as silica gel as a dehumidifying agent, or a mixture of a porous material, a porous metal oxide such as silica gel, and a hygroscopic salt, and mixing the dehumidifying agent with a fibrous material to form a paper, or applying the dehumidifying agent to a sheet substrate to produce a dehumidifying sheet or a dehumidifying filter. Patent Document 3 discloses a method of controlling humidity under the floor using a granular humidity conditioner containing a specific hydrated iron-containing aluminum oxide, and describes laying a moisture-proof sheet under the floor and providing a layer of the granular humidity conditioner on the moisture-proof sheet, or laying a sheet containing the granular humidity conditioner and having at least an upper surface that is breathable under the floor. Patent Document 4 discloses a dehumidifier consisting of multiple metal tubes filled with dehumidifying agents and a frame with legs that holds the multiple tubes, and describes that the dehumidifying agent is calcium chloride or lithium chloride impregnated into a woven fabric, sponge, or pipe.

[0005] JP 2012-200644 A JP 2011-194352 A JP 2003-033624 A JP 2002-326011 A

[0006] As described above, porous materials can provide condensation stopping materials that can absorb and release moisture over a wide range of humidity, and therefore there is a demand for the development of condensation stopping members that contain porous materials as their main components.

[0007] The dehumidifying sheets and dehumidifying filters described in Patent Documents 1 and 2 can be suitably used as dehumidifying rotors in desiccant air conditioners. However, because the regeneration of the dehumidifying agent (desorption of adsorbed water vapor) requires the blowing of air heated to a low temperature, they are unsuitable as condensation stoppers that are installed in desired locations, such as under the floor or ceiling of a house, to prevent high temperatures and humidity in summer and condensation in winter. Furthermore, when a dehumidifying sheet is made by mixing the dehumidifying agent with a fibrous material and making it into paper, not only is a papermaking process required, but the thickness and shape of the resulting sheet are limited, making it difficult to increase the amount of dehumidifying agent carried.

[0008] To obtain the granular humidity conditioner consisting of specific hydrated iron-containing aluminum oxide granules described in the aforementioned Patent Document 3, a separate step of forming the granules by extrusion molding or the like is required, and therefore it cannot be said to be a simple method. The Patent Document also describes mixing the hydrated iron-containing aluminum oxide with fibers and making paper or nonwoven fabric, but as with the above, there are limitations on the thickness and shape of the resulting sheet, and it is difficult to increase the amount of humidity conditioner carried. Furthermore, the Patent Document does not specifically disclose any sheet substrate other than papermaking or nonwoven fabric using the aforementioned fibers. Furthermore, the Patent Document 4 only describes impregnating a substrate with an aqueous solution of calcium chloride or lithium chloride, and does not disclose porous materials.

[0009] The present invention has been made in view of the above circumstances, and aims to provide a condensation stopping member that is capable of absorbing and releasing moisture over a wide range of humidity, and that has high-performance adsorption performance particularly in the medium to high humidity range, by using a substrate that can easily support a sufficient amount of porous material as the main component without being limited by thickness or shape, as a substrate that supports the porous material, and to provide a method for manufacturing the condensation stopping member.

[0010] As a result of extensive research into achieving the above object, the inventors discovered that by impregnating an (absorbent) sponge with an aqueous slurry made by mixing powder of a porous material, hyaluronic acid, polyvinyl alcohol, and water, it is possible to obtain a dehumidifying and condensation-stopping component that is capable of absorbing and releasing moisture over a wide range of humidity, and that has improved adsorption performance particularly in the medium to high humidity range, thereby completing the present invention.

[0011] That is, the present invention for solving the above problems includes the following aspects. [1] A condensation stopping member that does not require air circulation, in which a water-absorbent sponge is impregnated with an aqueous slurry containing a porous material, hyaluronic acid, and polyvinyl alcohol, and then dried, so that a condensation stopping material containing a porous material is supported in the pores of the water-absorbent sponge, thereby enabling the absorption and gradual release of moisture. [2] The condensation stopping member, in which the porous material is silica gel, zeolite, activated carbon, MOF (metal-organic framework), HASClay, or the like. [3] The condensation stopping member, in which the sponge has an average pore size of 90 to 1200 μm. [4] The sponge has a support density of the condensation stopping material of 0.04 g / cm ３ The condensation stopping member according to claim 1, wherein the water-based slurry containing the porous material is impregnated into a water-absorbent sponge, and the water-based slurry-impregnated sponge is dried. [6] The condensation stopping member according to claim 1, wherein the water-based slurry is evenly distributed within the pores of the sponge by vibrating the sponge during the impregnation of the sponge with the water-based slurry.

[0012] According to the present invention, by using a water-absorbent sponge as a substrate and supporting a condensation stopper containing a water-soluble binder together with a porous material as a main component in the pores of the sponge, it is possible to ensure a sufficient amount of the porous material supported without being limited by the thickness or shape of the substrate, while being able to absorb and release moisture in a wide range of humidity, and in particular, to provide a condensation stopper with high-performance adsorption performance in the medium to high humidity range through a simple process.Furthermore, according to the present invention, by further containing hyaluronic acid in the condensation stopper, the performance of the porous material is significantly improved, and a larger amount of the condensation stopper can be supported in the pores of the water-absorbent sponge as a support.

[0013] Condensation prevention material of the present invention, Example of water-based slurry absorbent sponge, Process of permeation of water-based slurry into sponge, Example of dried condensation prevention member, Example of experimental form of condensation prevention member, Diagram of greenhouse before installation of condensation prevention member, Temperature and humidity graph inside greenhouse before installation of condensation prevention member, Absolute humidity change graph inside greenhouse before installation of condensation prevention member, Installation example of condensation prevention member in greenhouse, Graph of change in condensation prevention due to installation of condensation prevention member

[0014] The following describes a condensation stopping member and a method for manufacturing the same in an embodiment of the present invention (hereinafter referred to as the "present embodiment"), but the present invention is not limited to the present embodiment. Furthermore, among the components of the present embodiment, components that are not recited in the claims that represent the most general concept are described as optional components. When a numerical range is expressed using "to", it also includes the numerical values ​​recited as the lower and upper limits.

[0015] Hereinafter, a dew condensation stopping material and a dew condensation stopping member according to an embodiment of the present invention will be described.

[0016] 1 shows an aqueous slurry of a condensation inhibitor according to an embodiment of the present invention. The aqueous slurry is produced by mixing and stirring a porous material, hyaluronic acid, polyvinyl alcohol, and water.

[0017] Figure 2 shows an example of a water-absorbent sponge. A sheet of textured sponge is cut into pieces of about a few centimeters on each side.

[0018] Figure 3 shows the process of the anti-condensation material aqueous slurry permeating into the sponge. In this state, the anti-condensation material is in a liquid state. By applying vibration during the permeation process, the anti-condensation material is evenly distributed within the sponge.

[0019] FIG. 4 shows an example of a dried condensation stopping member.

[0020] 5 shows an example of the shape of the condensation stopping member used in the embodiment, but the condensation stopping member is not limited to this shape.

[0021] FIG. 6 is a diagram of the greenhouse before the condensation stopping member is installed.

[0022] FIG. 7 is a graph showing the temperature and humidity inside the greenhouse before the condensation stopping member was installed.

[0023] 8 is a graph showing the change in absolute humidity inside the greenhouse before and after the condensation stopping member was installed. It shows that not only was condensation stopped by the condensation stopping member of the present invention, but condensation did not reoccur after the condensation stopping member was installed.

[0024] Figure 9 shows an example of the installation of the condensation stopper in a greenhouse. The condensation stopper of the present invention is extremely light, so multiple units can be installed. Even when many condensation stoppers are installed, there is little impact on the crops.

[0025] 10 is a graph showing the change in condensation cessation due to the installation of the condensation cessation member. After the condensation cessation member was installed, condensation stopped and no condensation has occurred since then.

[0026] <<Condensation Stopping Member>> The condensation stopping member of this embodiment is characterized in that a condensation stopping material containing a porous material and a water-soluble binder is supported in the pores of a (water-absorbent) sponge.

[0027] <Condensation Anti-Stabilizer> The condensation anti-stabilizer of this embodiment is obtained by drying an aqueous slurry containing a porous material, hyaluronic acid, and polyvinyl alcohol.

[0028] (Porous Material) The porous material used in this embodiment is an inorganic adsorbent (hereinafter referred to as HASClay) which is a composite made of an amorphous porous material (HAS: Hydroxyl Aluminum Silicate) and low-crystalline clay, but the porous material of the present invention is not limited to HASClay.

[0029] (Water-soluble binder) The condensation anti-material of this embodiment contains a water-soluble binder in addition to the porous material as the main component. By including the water-soluble binder in the condensation anti-material of the present invention, it becomes possible to support a sufficient amount of the condensation anti-material in the pores of the sponge as the support without affecting the moisture absorption and desorption performance of the porous material.

[0030] The water-soluble binder used in the anti-condensation material of the present invention is not particularly limited as long as it is water-soluble and can form an aqueous slurry when mixed with water together with the powder of the porous material. Examples of water-soluble binders include polyvinyl alcohol (PVA), sugars, phenolic resins, polycarboxylic acid resins, etc. Among these, polyvinyl alcohol (PVA) is preferred because it is inexpensive, highly safe, and easily available. Polyvinyl alcohol (PVA) may have vinyl acetate units in addition to vinyl alcohol units.

[0031] (Content of porous material and water-soluble binder) In the anti-condensation material of this embodiment, the content of the porous material and the water-soluble binder is, in mass percent when dry, 80 to 99 mass percent for the porous material and 1 to 20 mass percent for the water-soluble binder, and more preferably 85 to 95 mass percent for the porous material and 5 to 15 mass percent for the water-soluble binder.

[0032] (Hyaluronic Acid) The condensation stopper of this embodiment preferably further contains hyaluronic acid. The hyaluronic acid used in the condensation stopper of this embodiment is a hydrophilic polymer with hygroscopicity. In the condensation stopper of this embodiment, by including hyaluronic acid together with the porous material, the performance of the porous material is significantly improved, specifically, the moisture absorption and desorption performance over a wide range of humidity is further improved, and the condensation stopper exhibits high-performance adsorption performance in the medium to high humidity range in particular. Furthermore, in the condensation stopper of this embodiment, by including hyaluronic acid in addition to the water-soluble binder, it is possible to support a sufficient amount of the condensation stopper in the pores of the sponge, which is the support.

[0033] In this embodiment, the hyaluronic acid used is not particularly limited, but may be, for example, a disaccharide polymer consisting of glucuronic acid and N-acetylglucosamine with an average molecular weight of 50,000 to 10,000,000 daltons. Hyaluronic acid can be produced by known methods, or hyaluronic acid itself can be obtained commercially.

[0034] In this embodiment, can use free hyaluronic acid or its salt.The salt of hyaluronic acid used in the present invention is not particularly limited, but can be for example, sodium salt, potassium salt, calcium salt, aluminum salt, zinc salt, iron salt, ammonium salt, tetrabutylammonium salt etc.As mentioned above, this kind of hyaluronic acid salt can be easily obtained from the market.In addition, the hyaluronic acid obtained from the market can also be made into salt by well-known method to prepare hyaluronic acid salt.

[0035] In addition, as the hyaluronic acid derivative, for example, hyaluronic acid that has a hydrophilic group such as sulfonic acid group, phosphate group, amino group, etc. in the side chain or main chain, hyaluronic acid that further increases hydroxyl group or carboxyl group, or hyaluronic acid that the carboxyl group contained in hyaluronic acid is converted into hyaluronate with sodium ion, potassium ion, etc. Among them, as the hyaluronic acid that is used in the dew condensation stopping material of this embodiment, hyaluronate is preferred, and this hyaluronate is easily available on the market.

[0036] The hyaluronic acid derivative that can be used in the present embodiment can be the substance that has the hyaluronic acid skeleton that is derived from hyaluronic acid, in addition to the substance that has introduced hydrophilic group into the molecule as mentioned above.This hyaluronic acid derivative is not particularly limited, but can be exemplified by the substance that one or more carboxyl groups in hyaluronic acid are esterified, the substance that hyaluronic acid is partially crosslinked with formaldehyde and further polymerized, the acetylated hyaluronic acid that one or more hydroxyl groups in hyaluronic acid are acetylated, etc.

[0037] In this embodiment, only at least one type of hyaluronic acid or only at least one type of hyaluronic acid derivative may be used, or at least one type of hyaluronic acid and at least one type of hyaluronic acid derivative may be used in combination.

[0038] (Hyaluronic acid content) When the condensation-stopping material of this embodiment contains hyaluronic acid, the content of hyaluronic acid in the entire condensation-stopping material is, in mass percent when dry, 0.01 to 10 mass percent, and more preferably 0.01 to 0.1 mass percent.

[0039] (Other Components) The condensation inhibitor of the present embodiment may contain any other components in addition to the above-mentioned essential components and the optional component hyaluronic acid, as long as the effects of the present invention are not impaired.

[0040] <Water-Absorbent Sponge> In the condensation stopper of this embodiment, the (water-absorbent) sponge is used as a carrier that supports the above-mentioned porous material and water-soluble binder, or a condensation stopper that further contains hyaluronic acid, within its pores. Therefore, the (water-absorbent) sponge in this embodiment is not particularly limited as long as it can support at least the porous material and water-soluble binder within its pores. Specifically, any sponge with open cells may be used, including natural and synthetic sponges, such as sea sponges, urethane sponges, and urethane foams. In this embodiment, the (water-absorbent) sponge preferably has a pore diameter of 90 to 1200 μm.

[0041] In the condensation stopping member of this embodiment, the shape of the (water-absorbent) sponge is not particularly limited, and can be a sheet or any other shape depending on the application of the condensation stopping material described below. Furthermore, in the condensation stopping member of this embodiment, the thickness of the (water-absorbent) sponge is also not particularly limited, but as shown in the examples described below, the loading density of the condensation stopping material decreases as the thickness increases. On the other hand, reducing the thickness reduces the loading amount, which can be solved by using multiple (water-absorbent) sponges as the base material.

[0042] (Density of Dew Condensation Stopping Material Carried in Water-Absorbent Sponge) In the dew condensation stopping member of this embodiment, the density of the dew condensation stopper carried in the pores of the (water-absorbent) sponge is changed depending on the average pore size and thickness of the (water-absorbent) sponge used, the presence or absence of hyaluronic acid in the dew condensation stopper, and whether vibration is applied in the impregnation step described later, as shown in the examples described later. By combining these conditions, it is possible to achieve a density of 0.04 g / cm ３ It can be more than that.

[0043] <<Method for manufacturing condensation stopping member>> The method for manufacturing a dehumidifying and anti-freezing member in this embodiment includes: (I) a step of impregnating an absorbent sponge with an aqueous slurry containing a porous material and a water-soluble binder; and (II) a step of drying the sponge impregnated with the aqueous slurry.

[0044] (Preparation of aqueous slurry) Aqueous slurry is prepared by adding an aqueous solution of a water-soluble binder and water to a powder of a porous material, or by adding an aqueous solution of a water-soluble binder, hyaluronic acid, and water to a powder of a porous material and mixing well. The particle size of the powder of the porous material must be sufficiently smaller than the pore size of the sponge to be supported, preferably 0.5 to 100 μm, more preferably 1 to 10 μm. Prior to preparing the aqueous slurry, the powder of the porous material may be crushed or classified as necessary to adjust the particle size.

[0045] (Impregnation Step / Drying Step) The water-absorbent sponge is immersed in the aqueous slurry prepared above to impregnate the sponge with the aqueous slurry. By vibrating the aqueous slurry while immersing the sponge in the aqueous slurry, the aqueous slurry can be impregnated into the pores of the sponge. The method for vibrating the aqueous slurry is not particularly limited, but examples include a method using an electric field-forming device that improves penetration, such as DENBA+2.0 manufactured by DENBA Corporation. Next, the sponge impregnated with the aqueous slurry is dried. The drying temperature and time are not particularly limited as long as the sponge does not melt due to heat, but are preferably 20 to 70°C, and more preferably 30 to 60°C. After drying, solids adhering to the outer surface of the sponge that are not supported in the pores may be removed to prevent detachment from the sponge.

[0046] <Uses of Condensation Stopping Member> The condensation stopping member of this embodiment is capable of absorbing and releasing moisture over a wide range of humidity, and has particularly high adsorption performance in the medium to high humidity range, so its uses are not particularly limited and it can be used in various applications where a condensation stopping member is required. Specifically, for example, it can be installed in desired locations such as under the floor or ceiling of a house to prevent high temperatures and humidity in summer and condensation in winter, and can also be used as a dehumidifying sheet for closets and dressers, and as interior materials such as wallpaper and flooring.

[0047] The present invention will be specifically explained below with reference to examples, but the present invention is not limited to these examples.

[0048] <Production of Aluminum-Silicate Composite> In the examples, an aluminum-silicate composite powder was used. The porous material composite powder was produced using 1000 mL of a water glass aqueous solution with a Si concentration of 495 mmol / L as the silicon source (Si source) and 1000 mL of an aluminum sulfate aqueous solution with an Al concentration of 450 mmol / L as the aluminum source (Al source).

[0049] A water glass aqueous solution was added to an aluminum sulfate aqueous solution and stirred for approximately 15 minutes. The Si / Al molar ratio at this time was 1.1. After stirring, a 5N sodium hydroxide aqueous solution was added until the pH reached approximately 7, obtaining a suspension. The amount of sodium hydroxide aqueous solution added was 12 mL. The resulting suspension was stirred for one hour to prepare a precursor suspension. 1000 mL of the prepared precursor suspension was washed three times by centrifugation and then reconstituted as a 1000 mL precursor suspension. 70 mL of the obtained precursor suspension was placed in a Teflon (registered trademark) container and heated at 200°C for six hours. The resulting mixture was then dried at 60°C for one day and then pulverized to obtain a powder with a particle size of 1 to 10 μm.

[0050] The powder was subjected to powder X-ray diffraction measurement. The powder X-ray diffraction pattern showed broad peaks at 2θ = 20°, 26°, 35°, and 40°, confirming the formation of a porous material composite.

[0051] <Preparation of aqueous slurry> 50 g of a 10% polyvinyl alcohol (Kaneyonol, manufactured by Kaneyo Soap Co., Ltd.) aqueous solution and 140 g of water were added to 60 g of the powder of the porous material composite obtained above, and the mixture was thoroughly mixed to prepare an aqueous slurry (1). 0.3 g of sodium hyaluronate (sodium hyaluronate powder, manufactured by Horus Co., Ltd.), 50 g of a 10% polyvinyl alcohol aqueous solution, and 140 g of water were added to 60 g of the powder of the porous material composite obtained above, and the mixture was thoroughly mixed to prepare an aqueous slurry (2). 140 g of water was added to 60 g of the powder of the porous material composite obtained above, and the mixture was thoroughly mixed to prepare an aqueous slurry (3).

[0052] <Preparation of dew condensation stopper> (Example 1) In the aqueous slurry (1) that does not contain hyaluronic acid obtained above, urethane sponge (Yawata Neji Co., Ltd., uneven cushion 30 small wave) of length 3cm, width 3cm, thickness 2.5cm, average pore diameter 1000 μ m is immersed for 15 minutes, and after drying at 40 ℃, remove the solid matter on the surface, thereby obtain dew condensation stopper. (Example 2) As aqueous slurry, except that the aqueous slurry (2) that contains hyaluronic acid obtained above is used, obtain dew condensation stopper in the same manner as in Example 1. (Comparative Example) As aqueous slurry, except that the aqueous slurry (3) that is obtained above is used, obtain dew condensation stopper in the same manner as in Example 1.

[0053] <Density of adsorbent supported in condensation stopping member> In the condensation stopping members obtained in Examples 1 and 2 (and the comparative example), the amount (g) and density (g / cm) of the condensation stopping material supported on each member were measured. ３ ) are shown in Table 1. The supported amount (g) was determined by subtracting the mass (g) of the sponge not impregnated with the aqueous slurry from the mass (g) of the condensation stopping member obtained in Examples 1 and 2 and the Comparative Example, which was obtained by drying a sponge not impregnated with the aqueous slurry at 40°C for 24 hours and then weighing it.

[0054] [Table 1]

[0055] From the results shown in Table 1, it is clear that in the comparative example that does not use PVA, compared with the case that uses PVA (both do not contain hyaluronic acid), the amount of support is reduced to about 64%.In addition, it is clear that by using hyaluronic acid (mass ratio to aluminum silicate is 0.5%) in combination, the amount of support (g) can be increased.

[0056] <Water Vapor Adsorption Amount Evaluation> The condensation elimination members obtained in Examples 1 and 2 were evaluated for water vapor adsorption. (Evaluation Method) Evaluation was performed using the condensation elimination members obtained in Examples 1 and 2 and a sponge not impregnated with the aqueous slurry. Each member was dried at 40°C for 24 hours to remove surface solids, and then weighed. The dry mass of each member was determined by subtracting the mass of the sponge not impregnated with the aqueous slurry from the dry mass. Next, the member was placed in a thermo-hygrostat at 25°C and a relative humidity of 95% to adsorb water vapor. The mass was measured after 0.5 hours, 1 hour, 1.5 hours, 3 hours, 6 hours, and 24 hours, and the mass after subtracting the mass of the sponge not impregnated with the aqueous slurry was determined as the mass after adsorption. The adsorption rate was calculated from the dry mass and the mass after adsorption using the following formula. Adsorption rate (%) = (mass after adsorption - dry mass) ÷ dry mass × 100 After adsorption for another 24 hours, the sample was placed in a thermo-hygrostat at 25°C and a relative humidity of 60%, and the mass was measured after 12 hours of regeneration (a total of 36 hours), and the adsorption rate (%) after 12 hours of regeneration was determined in the same manner as above. The results of the water vapor adsorption evaluation are shown in Table 2.

[0057] [Table 2]

[0058] The results shown in Table 2 show that the performance of the porous material can be improved by including hyaluronic acid.

[0059] From the above results, it is desirable that the impregnation aqueous slurry contains hyaluronic acid. Therefore, in the following examples, the effects of pore size and vibration were investigated using the impregnation aqueous slurry (2).

[0060] <Study on Pore Diameter> <Production of Condensation Stopping Member> (Example 3) A urethane sponge (manufactured by AION Co., Ltd., product number PU-N1T) having a length of 5 cm, a width of 5 cm, a thickness of 0.1 cm, and an average pore diameter of 25 μm was immersed in the aqueous slurry (2) obtained above for 15 minutes, and after drying at 40° C., solids on the surface were removed to obtain a dehumidifying and condensation stopping member.

[0061] Example 4 A urethane sponge (manufactured by AION Co., Ltd., product number PU-N5T) having a length of 5 cm, a width of 5 cm, a thickness of 0.5 cm, and an average pore diameter of 25 μm was immersed in the aqueous slurry (2) obtained above for 15 minutes, and after drying at 40° C., solids on the surface were removed to obtain a dehumidifying and condensation preventing member.

[0062] (Example 5) A urethane sponge (manufactured by Fuji Chemical Co., Ltd., product number 1 mm, size 1200 × 600 mm) having a length of 5 cm, a width of 5 cm, a thickness of 0.5 cm, and an average pore diameter of 90 μm was immersed in the aqueous slurry (2) obtained above for 15 minutes, dried at 40°C, and then solids on the surface were removed to obtain a dehumidifying and condensation preventing member.

[0063] (Example 6) A urethane sponge (manufactured by Fuji Chemical Co., Ltd., product number 5 mm, size 1200 × 600 mm) having a length of 5 cm, a width of 5 cm, a thickness of 0.1 cm, and an average pore diameter of 150 μm was immersed in the aqueous slurry (2) obtained above for 15 minutes, dried at 40°C, and then solids on the surface were removed to obtain a dehumidifying and condensation preventing member.

[0064] <Supporting Density of Adsorbent in Condensation Stopping Member> In the same manner as in Example 2, the supporting density of the condensation stopping material supported on the dehumidifying and condensation stopping members obtained in Examples 3 to 6 was determined. The results are shown in Table 3 together with the results obtained in Example 2.

[0065] [Table 3]

[0066] As shown in Table 3, the results of Examples 3 and 6 and Examples 4 and 5, which have the same thickness, reveal that the loading density of the condensation stopping material in the dehumidifying and condensation stopping member increases as the pore diameter increases.

[0067] Effect of Vibration in the Preparation of Condensation Stopping Members (Examples 7 to 11) The condensation stopping members of Examples 7 to 11 were obtained in the same manner as in Examples 3 to 6 and Example 2, respectively, except that the aqueous slurry (2) obtained above was vibrated using a vibrating device (DENBA+2.0, manufactured by DENBA Corporation) while an absorbent sponge was immersed in the slurry.

[0068] <Loading density of adsorbent in condensation stopping member> Table 4 shows the loading density of the condensation stopping material loaded on the condensation stopping member obtained in Examples 3 to 6, 2 and Examples 7 to 11, divided into conditions with and without vibration during immersion.

[0069] [Table 4] (unit: g / cm 3 )

[0070] As shown in Table 4, it was clear that when the pore diameter was 150 to 1000 μm, the loading density was higher with vibration.

[0071] <Evaluation of Water Vapor Adsorption Amount> The condensation elimination members obtained in Examples 2 to 11 were evaluated for water vapor adsorption. (Evaluation Method) Evaluations were performed using the condensation elimination members obtained in Examples 2 to 11 and a sponge not impregnated with the aqueous slurry. Each member was dried at 40°C for 24 hours, then weighed. The dry mass of each member was determined by subtracting the mass of the sponge not impregnated with the aqueous slurry. The members were then placed in a constant temperature and humidity chamber at 25°C and 95% relative humidity to adsorb water vapor. The masses were measured after 0.5 hours, 1 hour, 1.5 hours, 3 hours, 6 hours, and 24 hours, and the post-adsorption mass was determined by subtracting the mass of the sponge not impregnated with the aqueous slurry. The adsorption rate was calculated from the dry mass and the post-adsorption mass using the following formula. Adsorption rate (%) = (mass after adsorption - dry mass) ÷ dry mass × 100 After adsorption for another 24 hours, the sample was placed in a thermo-hygrostat at 25°C and a relative humidity of 60%, and the mass was measured after 12 hours of regeneration (a total of 36 hours), and the adsorption rate (%) after 12 hours of regeneration was determined in the same manner as above. The obtained results of the water vapor adsorption evaluation are shown in Table 5.

[0072] [Table 5] (unit: wt%)

[0073] The results in Table 5 show that the 0.1 cm thick members (Examples 3, 7, 6, and 10) adsorbed a large amount of water vapor from 0.5 to 1 hour, completing the adsorption of water vapor after approximately 1 hour. However, for members with a thickness of 0.5 cm or more (Examples 4, 8, 5, and 9: 0.5 cm; Examples 2 and 11: 2.5 cm), the amount of water vapor adsorption increased with adsorption time, completing the adsorption after approximately 3 hours. It was revealed that the adsorption amount per unit volume exceeded 10 wt% in 0.5 hours for members with a pore diameter of 90 μm or more (Examples 5, 9, 6, 10, 2, and 11). Furthermore, when the relative humidity was lowered to 60% after 24 hours of adsorption, the adsorbed moisture was desorbed in all members, demonstrating that lowering the relative humidity allowed for drying.

[0074] In the above example, when the condensation stopping member of the present invention was installed in an area of ​​an agricultural greenhouse where condensation was occurring, it was confirmed that the condensation stopped and no condensation occurred thereafter, and the present invention was completed.

[0075] Although the present invention is a condensation stopper invented for the purpose of stopping condensation in agricultural greenhouses, the performance of this condensation stopper is not limited to stopping condensation. For example, it can be used as a humidity control material for architectural wall materials, a humidity absorbent for clothing storage, etc. It may also be used as a condensation stopper and humidity control material in industrial and agricultural facilities.

Claims

1. A condensation-stopping component that does not require air circulation; it is made by impregnating an absorbent sponge with an aqueous slurry containing a porous material, hyaluronic acid, and polyvinyl alcohol, and then drying it. This allows the condensation-stopping material containing the porous material to be supported within the pores of the absorbent sponge, thereby absorbing and gradually releasing moisture.

2. The condensation stopper, wherein the porous material is silica gel, zeolite, activated carbon, MOF (metal-organic framework), HASClay, or the like.

3. The condensation stopping member, wherein the sponge has an average pore size of 90 to 1200 μm.

4. The density of the condensation stopper material in the sponge is 0.04 g / cm ３ The condensation stopping member according to claim 1 .

5. A method for manufacturing the condensation stopping member, comprising: a step of impregnating the water-absorbent sponge with the aqueous slurry containing the porous material; and a step of drying the sponge impregnated with the aqueous slurry.

6. A method for manufacturing the condensation stopping member, wherein in the step of impregnating the absorbent sponge with the aqueous slurry, the sponge is vibrated to cause the aqueous slurry to be evenly carried within the pores of the absorbent sponge.

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