Humidity-controlling material and humidity-controlling member

Abstract

The humidity-controlling material of the present disclosure has a first humidity-controlling component that absorbs or releases moisture and a water-absorbing body that contains a water-absorbing material, the first humidity-controlling component being sodium propionate. Alternatively, the first humidity-controlling component contains at least one selected from the group consisting of sodium propionate, sodium formate, potassium formate, and potassium acetate.

Description

Technical Field

[0001] This disclosure relates to humidity-regulating materials and humidity-regulating components. This application claims priority based on Japanese Patent Application No. 2023-186039, filed on October 31, 2023, the contents of which are incorporated herein by reference. Background Technology

[0002] Previously, a hygroscopic composition was disclosed.

[0003] For example, in Patent Document 1, sodium acetate and / or potassium acetate, as non-halogenated inorganic salts, are used in the hygroscopic composition to provide an inexpensive hygroscopic composition that has high hygroscopicity, low probability of metal rusting, and high safety.

[0004] Existing technical documents Non-patent literature Patent Document 1: Japanese Patent Application Publication No. 2000-005550 Summary of the Invention The technical problem this disclosure aims to solve However, the aforementioned acetates promote corrosion of iron sheets that do not have a corrosion-resistant film, or whose corrosion-resistant film has peeled off or thinned, especially in high humidity environments with a relative humidity of over 70%, which is a cause for concern from a safety perspective.

[0005] In view of the above-mentioned problems, the present disclosure aims to provide a humidity-regulating material and humidity-regulating component that improves low corrosion resistance to rust and has high humidity-regulating function by absorbing or releasing moisture.

[0006] Technical solutions for solving technical problems The first aspect of the present disclosure includes a humidity-regulating material comprising a first humidity-regulating component that absorbs or releases moisture; and a water-absorbing body comprising a water-absorbing material, wherein the first humidity-regulating component is sodium propionate.

[0007] The second aspect of the humidity-regulating material disclosed herein comprises a first humidity-regulating component that absorbs or releases moisture; and an absorbent body comprising an absorbent material, wherein the first humidity-regulating component contains at least one selected from the group consisting of sodium propionate, sodium formate, potassium formate, and potassium acetate.

[0008] The third-party humidity control component disclosed herein includes a humidity control material as described in the first or second embodiment; and a carrier that supports the humidity control material.

[0009] Beneficial effects As described above, according to this disclosure, it is possible to provide humidity-regulating materials and humidity-regulating components that improve low corrosivity and have high humidity-regulating function by absorbing or releasing moisture. Attached Figure Description

[0010] Figure 1 This is a schematic cross-sectional view of the humidity-regulating material of this disclosure.

[0011] Figure 2 It is a graph representing the hygroscopic isotherm.

[0012] Figure 3 It is a graph representing the hygroscopic isotherm.

[0013] Figure 4 It is a graph representing the moisture absorption rate when the product contains a water-absorbing resin and a first moisture-conditioning component and / or a second moisture-conditioning component.

[0014] Figure 5 It is the result of a corrosion test.

[0015] Figure 6 The diagram is a schematic representation of the humidity regulating component of this disclosure, and also a diagram showing a humidity regulating component in which the humidity regulating material is dispersed in a nonwoven fabric.

[0016] Figure 7 The diagram is a schematic representation of the humidity regulating component of this disclosure, and also a diagram showing a humidity regulating component in which humidity regulating material is disposed between nonwoven fabrics.

[0017] Figure 8 The diagram is a schematic representation of the humidity regulating component of this disclosure, and also a diagram showing a humidity regulating component with a humidity regulating material disposed on the surface of a breathable substrate.

[0018] Figure 9 This is a schematic cross-sectional view of the humidity-regulating material of this disclosure.

[0019] Figure 10 This is a graph showing the hygroscopic isotherms of the samples from Examples 1 to 5.

[0020] Figure 11A This is a graph showing the hygroscopic isotherms of sodium propionate, sodium carbonate, and the sample from Example 1.

[0021] Figure 11B This is a graph showing the hygroscopic isotherms of sodium formate, sodium carbonate, and the sample from Example 3.

[0022] Figure 11C This is a graph showing the hygroscopic isotherms of potassium formate, sodium carbonate, and the sample from Example 4.

[0023] Figure 11D This is a graph showing the hygroscopic isotherms of potassium acetate, potassium carbonate, and the sample from Example 5.

[0024] Figure 12 This is a diagram schematically illustrating a corrosion testing method.

[0025] Figure 13A An image showing the results of a corrosion test on the sample of Example 6.

[0026] Figure 13B This is an image showing the results of a corrosion test on the sample of Example 7.

[0027] Figure 13C This is an image showing the results of a corrosion test on the sample of Example 8.

[0028] Figure 13D An image showing the results of a corrosion test on the sample of Example 9.

[0029] Figure 13E This is an image showing the results of a corrosion test on the sample of Comparative Example 1.

[0030] Figure 13F This is an image showing the results of a corrosion test on the sample of Comparative Example 2.

[0031] Figure 14 The diagram is a schematic representation of the humidity regulating component of this disclosure, and also a diagram showing a humidity regulating component in which the humidity regulating material is dispersed in a nonwoven fabric.

[0032] Figure 15 The diagram is a schematic representation of the humidity regulating component of this disclosure, and also a diagram showing a humidity regulating component in which humidity regulating material is disposed between nonwoven fabrics.

[0033] Figure 16 The diagram is a schematic representation of the humidity regulating component of this disclosure, and also a diagram showing a humidity regulating component with a humidity regulating material disposed on the surface of a breathable substrate. Detailed Implementation

[0034] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Furthermore, the embodiments described below are not intended to unduly limit the content of the present disclosure as described in the technical solutions, and not all configurations described in these embodiments are necessary as solutions provided in the present disclosure.

[0035] 1. First Implementation Method [Humidity regulating materials] Figure 1 This is a schematic cross-sectional view of the humidity-regulating material 10 of this disclosure. (See diagram below.) Figure 1 As shown, the humidity-regulating material 10 of this disclosure includes a first humidity-regulating component 1 and a water-absorbing body 3 containing a water-absorbing material. Furthermore, the first humidity-regulating component 1 is sodium propionate.

[0036] Because deliquescent metal salts have a very high hygroscopic content, humidity regulators are used in combination with absorbent materials. Furthermore, deliquescent metal salts are generally highly corrosive, with carboxylates considered to have relatively low corrosion resistance. Representative carboxylates include sodium formate and sodium acetate. Iron, in particular, lacks a corrosion-resistant film under acidic conditions below pH 7 and will rust in high-temperature and high-humidity environments.

[0037] The first humidity-regulating component 1 of the humidity-regulating material 10 disclosed herein is sodium propionate, which improves its low corrosivity and has a high humidity-regulating function by absorbing or releasing moisture. The components of the humidity-regulating material 10 of this disclosure will be described below.

[0038] The first humidifying component 1 absorbs or releases moisture.

[0039] The humidity-regulating material 10 regulates the amount of moisture contained in the air. Furthermore, the humidity-regulating material 10 has the following characteristics: relative to the equilibrium humidity, it absorbs moisture when the surrounding relative humidity is relatively high (hygroscopic), and conversely, it releases moisture when the surrounding relative humidity is relatively low (dehumidification). Unlike desiccants such as silica gel and zeolite, it has a semi-permanent effect in principle due to the repeated absorption and release of moisture.

[0040] like Figure 1 As shown, the humidity-regulating material 10 includes: a water-absorbing material containing resin and / or clay minerals; and a first humidity-regulating component 1 that has a deliquescence point at a relative humidity of 50-60% and absorbs or releases moisture to regulate humidity. In addition to the first humidity-regulating component 1, the humidity-regulating material 10 may also include a sodium salt as a second humidity-regulating component 2, which has a deliquescence point at a relative humidity of 60-90% and can increase moisture absorption at higher humidity levels. The water-absorbing material can retain either the first humidity-regulating component 1 or the second humidity-regulating component 2. Depending on the humidity of the environment in which it is placed, the humidity-regulating material 10 absorbs moisture from the air in that location or releases moisture contained in the humidity-regulating material 10 into the air.

[0041] Furthermore, "humidification" refers to adjusting the relative humidity of the surrounding air to be close to the equilibrium humidity range of the humidity-conditioning material 10. Specifically, for example, when the equilibrium humidity of the humidity-conditioning material 10 is 50%RH, if the relative humidity of the surrounding air is higher than 50%RH, the humidity-conditioning material 10 absorbs moisture (hygroscopicity); if the relative humidity of the surrounding air is lower than 50%RH, the humidity-conditioning material 10 releases moisture (dehumidification). Typically, the specified relative humidity range is related to the material of the humidity-conditioning material 10. Specifically, for example, the specified relative humidity range is related to the ratio of the water content of the humidity-conditioning material 10 to the first humidity-conditioning component 1 and the second humidity-conditioning component 2.

[0042] The first moisture-regulating component 1 and the second moisture-regulating component 2 can be retained not only by the absorbent material but also by the carrier 20 that supports the moisture-regulating material 10. The carrier 20 will be described later.

[0043] As mentioned above, the first humidity-regulating component 1 is sodium propionate. This improves its low corrosivity and provides high humidity-regulating function by absorbing or releasing moisture.

[0044] In addition, the first moisture-regulating component 1 and the second moisture-regulating component 2 can be incorporated into the absorbent material described later, or they can exist separately and in combination.

[0045] The absorbent material functions to retain both the first humidity-regulating component 1 and the second humidity-regulating component 2. Because the absorbent material retains both the first humidity-regulating component 1 and the second humidity-regulating component 2, a humidity-regulating material 10 with a high surface area to volume ratio can be achieved. Therefore, the rate of moisture absorption or release can be increased. Thus, a humidity-regulating material 10 with a high humidity-regulating rate can be manufactured. Furthermore, the absorbent material is preferably in powder or granular form.

[0046] The absorbent material preferably contains at least one selected from the group consisting of absorbent resin (particles, powder) and clay minerals. In this way, the absorbent material can suitably retain either the first moisture-regulating component 1 or the second moisture-regulating component 2, thereby further improving the moisture-regulating effect.

[0047] Specific examples of absorbent resin materials include ionic and nonionic resins. Examples of ionic resins include alkali metal salts of polyacrylic acid (such as sodium polyacrylate) and starch-acrylate graft polymers, with alkali metal salts of polyacrylic acid being preferred. Specific examples of alkali metal salts of polyacrylic acid include sodium polyacrylate. Examples of nonionic resins include vinyl acetate copolymers, maleic anhydride copolymers, polyvinyl alcohol, and polyepoxides.

[0048] Specific examples of clay minerals include silicate minerals such as montmorillonite, sepiolite, palygorskite, kaolinite, perlite, and dolomite, as well as zeolites.

[0049] When the first moisture-regulating component 1 and the second moisture-regulating component 2 are present, the weight ratio of their total weight to the weight of the absorbent material is preferably 1:2 to 10:1, more preferably 1:1 to 3:1. This ensures that the amounts of absorbent material and the first moisture-regulating component 1 are appropriate, further improving the moisture-regulating function. Furthermore, if the proportion of the first moisture-regulating component 1 is too high, the risk of dehydration in the high humidity range is high; if the proportion of the first moisture-regulating component 1 is too low, the amount of moisture regulated may become insufficient.

[0050] The shape of the moisture-regulating material 10 can be powder, granules, or blocks, and it can also be used to effectively contact the air by loading the moisture-regulating components and absorbent materials onto a breathable substrate.

[0051] The second humidity-regulating component 2 is preferably a sodium salt having a deliquescence point within the range of 60-90% RH. This allows for the maintenance of a high humidity-regulating content, particularly in environments with a relative humidity of 60-90%. The second humidity-regulating component 2 is preferably at least one selected from the group consisting of sodium acetate and sodium carbonate. This further enhances the ability to maintain an even higher humidity-regulating content.

[0052] The humidity-regulating material 10 of this disclosure is more preferably further comprising a pH adjuster when it is necessary to suppress the generation of odor due to the release of acid from the humidity-regulating components. Preferably, the pH adjuster is alkaline on its own. In addition, the pH adjuster preferably contains a carbonate, wherein, particularly preferably, a sodium salt has little effect on the humidity-regulating properties of the first humidity-regulating component 1 or the second humidity-regulating component 2. If it is a sodium salt, then in the case of the generation of humidity-regulating components and ion exchange, there is also an exchange of sodium ions with each other, thus the effect on the humidity-regulating properties is reduced.

[0053] Next, the moisture absorption characteristics of the moisture-regulating material 10 disclosed herein will be explained.

[0054] Figure 2 This is a graph showing the hygroscopic isotherms and the moisture absorption rate relative to relative humidity. The moisture absorption rate is (weight of absorbed water) / (weight of humidifying components) × 100. The samples used sodium formate, sodium propionate, calcium chloride, and silica gel B. Additionally, the samples used sodium formate and absorbent resin, sodium propionate and absorbent resin, sodium formate, sodium propionate, calcium chloride, and silica gel B. Figure 2 As shown, samples using sodium propionate and sodium formate deliquesce at a relative humidity of 50-60%, and their deliquescent humidity is used as a threshold. Samples above this threshold rapidly absorb moisture (this is also considered a threshold characteristic). Furthermore, samples using sodium propionate and a water-absorbing resin, and sodium formate and a water-absorbing resin, also showed that the threshold characteristic was maintained after mixing with the water-absorbing resin. Therefore, when sodium formate or sodium propionate is selected as the first moisture-regulating component 1, it absorbs moisture significantly in high humidity environments above 60% relative humidity, and can regenerate in dry conditions below 50% relative humidity without artificial heating. Thus, moisture is absorbed during periods of lower temperature and higher relative humidity at night and in the morning, and regenerated during periods of higher temperature and lower relative humidity during the daytime, resulting in a large amount of moisture absorption and release throughout the day and night cycle, preventing condensation.

[0055] On the other hand, in samples using silica gel B, the amount of moisture absorbed and released is very small. In addition, as the primary moisture-conditioning component, the moisture-conditioning component using calcium chloride has a high moisture absorption rate even in the range of low relative humidity, for example, the moisture absorption rate exceeds 100% at a relative humidity of 30%, making it difficult to release moisture and dry, and resulting in low regeneration capacity.

[0056] Thus, by using moisture-regulating components such as sodium propionate and water-absorbing resin, or sodium formate and water-absorbing resin, excellent moisture-regulating properties are achieved due to their ability to provide a large amount of moisture regulation when the ambient humidity changes. Furthermore, the low corrosiveness of sodium formate and sodium propionate will be explained later.

[0057] Figure 3 It is also a graph representing the hygroscopic isotherm. Figure 3 Among them, sodium formate, sodium propionate, sodium acetate, ammonium nitrate, and sodium carbonate are shown as deliquescent salts with threshold properties. Figure 3 As shown, humidity-regulating components using sodium formate and sodium propionate deliquesce (absorb moisture) at 50-60% RH. Additionally, humidity-regulating components using ammonium nitrate deliquesce (absorb moisture) at 60-70% RH, and those using sodium acetate and sodium carbonate deliquesce (absorb moisture) at 70-80% RH.

[0058] Next, the moisture absorption rate of a moisture-conditioning material containing a second moisture-conditioning component in the first moisture-conditioning component will be explained.

[0059] Figure 4 It is a graph representing the moisture absorption rate when the product contains a water-absorbing resin and a first moisture-conditioning component and / or a second moisture-conditioning component. Figure 4 The moisture absorption rates for components 1 to 6 are shown. Each component is listed in Table 1 below. In component 1, sodium formate is used as a first moisture-conditioning component for reference. Furthermore, for components 2 to 6, sodium propionate is used as a first moisture-conditioning component, and sodium acetate, sodium carbonate, and ammonium nitrate are used as second moisture-conditioning components. Additionally, a water-absorbing resin is used in all components.

[0060] [Table 1] As shown in Table 1 and Figure 4 As shown, the moisture absorption rate of the moisture-absorbing materials that use sodium propionate in the first moisture-absorbing component and sodium carbonate in the second moisture-absorbing component (component 3) and sodium acetate in the second moisture-absorbing component (components 4 and 5) is improved compared with the moisture-absorbing materials that use sodium propionate alone.

[0061] On the other hand, a humidity-regulating material that uses sodium propionate in the first humidity-regulating component and ammonium nitrate in the second humidity-regulating component (composition 6) has a lower moisture absorption rate compared to a humidity-regulating material that uses sodium propionate alone. Furthermore, a humidity-regulating material that uses a water-absorbing resin alone has a lower moisture absorption rate compared to a humidity-regulating material that uses sodium propionate alone.

[0062] Therefore, as the second humidity-regulating component, a sodium salt having a deliquescence point within the range of 60-90% RH is preferred. Furthermore, it is preferably at least one selected from the group consisting of sodium acetate and sodium carbonate. This is considered because if the second humidity-regulating component is a sodium salt identical to sodium propionate, even if ion exchange occurs between the components, the impact on the humidity-regulating properties is small, the threshold properties of sodium propionate are not impaired, and the hygroscopic moisture content can be increased in the high humidity range.

[0063] Next, the results of the corrosion test on the sample made by mixing the first humidity-regulating component, the second humidity-regulating component, and the water-absorbing resin will be explained.

[0064] Figure 5 This is the result of a corrosion test. The test involves contacting a sample containing a mixture of the first humidity-regulating component, the second humidity-regulating component, and a water-absorbing resin with an iron sheet. The samples are as follows: a mixture of sodium formate (first humidity-regulating component), sodium acetate (first humidity-regulating component), sodium propionate (first humidity-regulating component), sodium propionate (first humidity-regulating component), and sodium acetate (second humidity-regulating component) in a weight ratio of 5:5; a mixture of sodium carbonate (first humidity-regulating component), sodium formate (first humidity-regulating component), and water-absorbing resin in a weight ratio of 0.4:0.6; a mixture of sodium propionate (first humidity-regulating component) and water-absorbing resin in a weight ratio of 0.4:0.6; and a mixture of sodium propionate (first humidity-regulating component), sodium acetate (second humidity-regulating component), sodium carbonate (pH adjuster), and water-absorbing resin in a weight ratio of 1.6:1.6:0.8:0.6.

[0065] In addition, O indicates a sample with low or excellent corrosivity, × indicates a sample with high or poor corrosivity, and △ indicates a sample with slight corrosivity or slightly poor corrosivity.

[0066] As a result, such Figure 5 As shown, in the samples using sodium propionate (first humidity-regulating component), sodium carbonate (first humidity-regulating component), and sodium propionate (first humidity-regulating component) and water-absorbing resin, the corrosion was low and the rust prevention safety was excellent because it did not corrode the iron sheet. Furthermore, the samples using sodium propionate (first humidity-regulating component) and sodium acetate (second humidity-regulating component), sodium propionate (first humidity-regulating component), acetic acid (second humidity-regulating component), sodium carbonate (pH adjuster), and water-absorbing resin also exhibited low corrosion and excellent rust prevention safety.

[0067] On the other hand, in samples using sodium formate, sodium acetate, sodium formate, and water-absorbing resin, the corrosion of iron sheets resulted in high corrosivity and poor rust prevention safety.

[0068] Therefore, regarding low corrosivity, excellent results were obtained for samples in which sodium propionate was used in the first humidity conditioning component, sodium propionate was used in the first humidity conditioning component, sodium acetate was used in the second humidity conditioning component, sodium carbonate was used in the first humidity conditioning component, or sodium carbonate was used in the pH adjuster.

[0069] Based on the above results regarding water absorption rate and low corrosivity, the following materials exhibit excellent performance in terms of water absorption and low corrosivity: a humidity-regulating material in which sodium propionate is used as the first humidity-regulating component; more preferably, a humidity-regulating material in which sodium propionate is used as the first humidity-regulating component and a sodium salt with a deliquescence point in the range of 60-90% RH is used as the second humidity-regulating component; and a humidity-regulating material in which sodium propionate is used as the first humidity-regulating component, sodium acetate as the second humidity-regulating component, and at least one pH adjuster selected from the group consisting of sodium carbonate.

[0070] While the main idea of ​​the humidity-regulating material of this disclosure being preferably also having a pH adjuster has been described, details are provided below.

[0071] Table 2 shows the acid dissociation constant, hydrolysis constant, vapor pressure, and odor of formic acid and propionic acid. As shown in Table 2, propionic acid has a larger acid dissociation constant than formic acid and is more easily released. It does not have the odor of formic acid; in contrast, propionic acid has an extremely low odor threshold and exhibits some odor.

[0072] [Table 2] When the absorbent material is an ionic resin, protons are supplied, causing acidification, which favors propionic acid above the bromine detection threshold. Therefore, to further reduce odor, it is preferable that the moisture-regulating material also contains a pH adjuster. By adjusting the pH to the alkaline side using the pH adjuster, the beneficial effect of propionic acid can be suppressed, and the odor can be improved. Therefore, it is preferable that the pH adjuster can be adjusted to the alkaline side.

[0073] Table 3 shows whether pH and odor were improved when sodium propionate was used in the first humidity conditioning component, sodium acrylate was used in the water-absorbing resin, and potassium carbonate, sodium carbonate, calcium carbonate, and dipotassium hydrogen phosphate were used in the pH adjuster.

[0074] [Table 3] As shown in Table 3, odor was improved when potassium carbonate, sodium carbonate, and dipotassium hydrogen phosphate were used as pH adjusters. Potassium carbonate and sodium carbonate showed significant improvement at relatively low concentrations. Furthermore, the pH shifted towards the alkaline side. Potassium carbonate showed a significant improvement at concentrations of 4.0% by weight or higher, while sodium carbonate showed a significant improvement at concentrations of 8.0% by weight or higher.

[0075] On the other hand, no odor improvement was observed when calcium carbonate was used as the pH adjuster. This is presumably because calcium carbonate has low water solubility. Furthermore, odor improvement was not achieved unless the concentration of dipotassium hydrogen phosphate was increased to above 30.0.

[0076] Therefore, the pH adjuster preferably contains at least a carbonate. Furthermore, a sodium salt that does not significantly affect the humidity-regulating properties of the first humidity-regulating component 1 or the second humidity-regulating component 2 is even more preferred. Additionally, a non-ionic pH adjuster may also be selected.

[0077] In summary, the humidity-regulating material disclosed herein has improved low corrosivity and high humidity-regulating function by absorbing or releasing moisture.

[0078] [Humidity regulating components] Figure 6 This is a schematic diagram illustrating the humidity-regulating component 100 of this disclosure, and specifically a diagram showing the humidity-regulating component 100 in which the humidity-regulating material 10 is dispersed in a nonwoven fabric. Figure 6 As shown, the humidity regulating component 100 of this disclosure includes the aforementioned humidity regulating material 10 and a carrier 20 for supporting the humidity regulating material 10.

[0079] Additionally, the humidity regulating component 100 disclosed herein can also be used as follows: Figure 6 The carrier 20 is made of nonwoven fabric as shown, and the moisture-regulating material 10 is dispersedly disposed on the nonwoven fabric. Nonwoven fabric is preferred due to its high water vapor permeability. Therefore, Figure 6 The humidity regulating component 100 shown can form a humidity regulating component 100 with a high surface area to volume ratio, which can accelerate the absorption or release of moisture. In addition, the carrier 20 can be a porous material, woven fabric, or other hydrophilic fiber, in addition to non-woven fabric.

[0080] Furthermore, the moisture-regulating material 10 can be adhered to the surface of the carrier 20 using an adhesive or the like. On the other hand, if the absorbent material also functions as an adhesive, then an adhesive is not required.

[0081] Figure 7 This diagram schematically illustrates the humidity-regulating component 100 of this disclosure, showing the humidity-regulating material 10 disposed between nonwoven fabrics. The humidity-regulating component 100 of this disclosure can be exemplified by sheet-like components. For example... Figure 7 As shown, the humidity-regulating component 100 of this disclosure can also have the carrier 20 be a non-woven fabric, with the humidity-regulating material 10 disposed between the non-woven fabric layers. The humidity-regulating material 10 can be bonded to the carrier 20 simply by using the adhesive 30 dispersed inside. By mixing flame-retardant fibers into the non-woven fabric, the sheet can be made flame-retardant. In addition, the first humidity-regulating component 1 and the second humidity-regulating component 2 can exist in the absorbent body 3, or they can exist separately and in mixture.

[0082] Figure 8 This is a schematic diagram illustrating the humidity-regulating component 100 of this disclosure, showing a humidity-regulating component in which the humidity-regulating material 10 is disposed on the surface or inside of a breathable substrate. Figure 8 As shown, the humidity-regulating component of this disclosure can also use the carrier 20 as a breathable substrate, and the humidity-regulating material 10 can be disposed on the surface or inside the breathable substrate. A pleated structure, honeycomb structure, or the like is preferred as the breathable substrate. This increases the surface contact with air and improves the humidity-regulating function.

[0083] As described above, according to this disclosure, a humidity-regulating material 10 and a humidity-regulating component 100 can be provided that improve low corrosivity and have high humidity-regulating function by absorbing or releasing moisture.

[0084] 2 Second Implementation Method [Humidity regulating materials] Figure 9 This is a schematic cross-sectional view of the humidity-regulating material 200 of this disclosure. (See diagram below.) Figure 9 As shown, the humidity-regulating material 200 of this disclosure includes a first humidity-regulating component 211 and a water-absorbing body 214 containing a water-absorbing material. Furthermore, the first humidity-regulating component 211 includes at least one selected from the group consisting of sodium propionate, sodium formate, potassium formate, and potassium acetate.

[0085] Sodium propionate, sodium formate, potassium formate, and potassium acetate have very high hygroscopicity and are deliquescent; therefore, they are used as humidity regulators in combination with absorbent materials used to prevent liquid leaks. Sodium propionate has low corrosivity. The corrosivity of sodium formate, potassium formate, and potassium acetate can be further reduced by adding pH adjusters, etc.

[0086] In the humidity-regulating material 200 of this disclosure, the first humidity-regulating component 211 contains at least one selected from the group consisting of sodium propionate, sodium formate, potassium formate, and potassium acetate, thus exhibiting only low corrosivity and high humidity-regulating function by absorbing or releasing moisture. The various components of the humidity-regulating material 200 of this disclosure will be described below.

[0087] The first humidifying ingredient, 211, absorbs or releases moisture.

[0088] Humidity-regulating material 200 adjusts the amount of moisture contained in the air. Furthermore, humidity-regulating material 200 has the following characteristics: relative to the equilibrium humidity, it absorbs moisture when the surrounding relative humidity is relatively high (hygroscopic), and conversely, it releases moisture when the surrounding relative humidity is relatively low (dehumidification). Unlike desiccants such as type A silica gel and zeolite, which require heating to release moisture, humidity-regulating material 200, due to its repeated absorption and release of moisture, has a semi-permanent effect in principle.

[0089] like Figure 9As shown, the humidity-regulating material 200 comprises: a water-absorbing material containing resin and / or clay minerals; and a first humidity-regulating component 211 that has a deliquescence point at relative humidity below 60% and exhibits humidity-regulating function by absorbing or releasing moisture. In addition to the first humidity-regulating component 211, the humidity-regulating material 200 may also include a sodium salt as a second humidity-regulating component 212, which has a deliquescence point at relative humidity of 60-90% and can increase moisture absorption at higher humidity levels. The water-absorbing material can retain either the first humidity-regulating component 211 or the second humidity-regulating component 212. Depending on the humidity of the environment in which it is placed, the humidity-regulating material 200 absorbs moisture from the air in that location or releases moisture contained in the humidity-regulating material 200 into the air.

[0090] Furthermore, "humidification" refers to adjusting the relative humidity of the surrounding air to be close to the equilibrium humidity band of the humidity-conditioning material 200. Specifically, for example, if the equilibrium humidity of the humidity-conditioning material 200 is 50% RH, then when the relative humidity of the surrounding air is higher than 50%, the humidity-conditioning material 200 absorbs moisture (hygroscopicity), and when the relative humidity of the surrounding air is lower than 50%, the humidity-conditioning material 200 releases moisture (dehumidification). Typically, the equilibrium humidity band of the humidity-conditioning material 200 is related to the material of the humidity-conditioning material 200. Specifically, for example, the equilibrium humidity band of the humidity-conditioning material 200 is related to the content of moisture contained in the humidity-conditioning agent 200 relative to the first humidity-conditioning component 211 and the second humidity-conditioning component 212.

[0091] The first moisture-regulating component 211 and the second moisture-regulating component 212 are retained not only in the absorbent material but also in the carrier supporting the moisture-regulating material 200. The carrier will be described later.

[0092] As described above, the first humidity-regulating component 211 comprises at least one selected from the group consisting of sodium propionate, sodium formate, potassium formate, and potassium acetate. Thus, the humidity-regulating material 200 exhibits low corrosivity and high humidity-regulating performance by absorbing or releasing moisture.

[0093] In addition, the first moisture-regulating component 211 and the second moisture-regulating component 212 can be incorporated into the absorbent material described later, or they can be mixed together instead of being incorporated into the absorbent material.

[0094] The absorbent material functions to retain the first moisture-regulating component 211 and the second moisture-regulating component 212. In the case where it consists only of moisture-regulating components 211 and 212, it becomes liquid and spreads outwards upon deliquescence. In contrast, because the absorbent material retains both the first and second moisture-regulating components 211 and 212, a moisture-regulating material 200 with a high surface area to volume ratio can be achieved. Therefore, the rate of moisture absorption or release can be increased. Thus, a moisture-regulating material 200 with a high moisture-regulating rate can be achieved. Furthermore, the absorbent material is preferably in powder or granular form.

[0095] The absorbent material preferably contains at least one selected from the group consisting of absorbent resin (particles, powder) and clay minerals. In this way, the absorbent material can appropriately retain either the first moisture-regulating component 211 or the second moisture-regulating component 212, thereby further improving the moisture-regulating effect.

[0096] Specific examples of absorbent resin materials include ionic resins and nonionic resins. Examples of ionic resins include alkali metal salts of polyacrylic acid (such as sodium polyacrylate) and starch-acrylate graft polymers, with alkali metal salts of polyacrylic acid being preferred. Specific examples of alkali metal salts of polyacrylic acid include sodium polyacrylate. Examples of nonionic resins include vinyl acetate copolymers, maleic anhydride copolymers, polyvinyl alcohol, and polyepoxides.

[0097] Specific examples of clay minerals include montmorillonite, sepiolite, palygorskite, kaolinite, perlite, dolomite, and other silicate minerals, as well as zeolites.

[0098] When the humidity-regulating material 200 has a first humidity-regulating component 211 and a second humidity-regulating component 212, the weight ratio of its total weight to the weight of the absorbent material is preferably 1:2 to 10:1, more preferably 1:1 to 3:1. This ensures that the amounts of absorbent material and the first humidity-regulating component 211 are appropriate, further improving the humidity-regulating function. Furthermore, if the proportion of the first humidity-regulating component 211 is too high, the risk of dehydration in the high humidity range may increase; if the proportion of the first humidity-regulating component 211 is too low, the amount of moisture regulated may be insufficient.

[0099] The shape of the moisture-regulating material 200 can be powder, granules, block, etc. The moisture-regulating material 200 can also be used by loading the moisture-regulating components and water-absorbing materials onto the breathable substrate to effectively contact the air.

[0100] The second humidity-regulating component 212 is preferably a sodium salt with a deliquescence point in the range of 60-90% RH. This allows the humidity-regulating material 200 to maintain a high humidity level, particularly in environments with a relative humidity of 60-90% RH. The second humidity-regulating component 212 is preferably at least one selected from the group consisting of sodium acetate and sodium carbonate. This allows the humidity-regulating material 200 to maintain an even higher humidity level.

[0101] The humidity-regulating material 200 of this disclosure is more preferably further comprising a pH adjuster 213 when it is necessary to suppress corrosion caused by acid leaching from the humidity-regulating components. Furthermore, regarding the humidity-regulating material 200 of this disclosure, it is also more preferably further comprising a pH adjuster 213 when it is necessary to suppress odor generated due to acid leaching from the humidity-regulating components. Preferably, the pH adjuster 213 is alkaline. Furthermore, it is preferable that the pH adjuster 213 contains a non-corrosive, harmless, volatile, and highly safe carbonate, wherein, when the first humidity-regulating component 211 or the second humidity-regulating component 212 is a sodium salt, it is particularly preferable that the sodium salt has little effect on the humidity-regulating properties of the first humidity-regulating component 211 or the second humidity-regulating component 212. If both the humidity-regulating component and the pH adjuster 213 are sodium salts, even if ion exchange occurs between the humidity-regulating component and the pH adjuster 213, the sodium ions will exchange with each other, thus reducing the impact on the humidity-regulating properties.

[0102] Next, the moisture absorption characteristics of the moisture-regulating material 200 disclosed herein will be explained.

[0103] Figure 10 This is a graph showing the moisture absorption isotherms of the samples from Examples 1 to 5, and a graph showing the moisture absorption rate relative to relative humidity. The moisture absorption rate is expressed as (weight of absorbed water) / (weight of water removed from the humidifying material) × 100. The samples from Examples 1 to 5 are mixtures as described below.

[0104] Example 1: A mixture of sodium propionate as the first humidity conditioning component 211, sodium carbonate as the pH adjuster 213, and sodium polyacrylate as the water-absorbing resin; Example 2: A mixture of sodium propionate as the first humidity conditioning component 211, sodium acetate as the second humidity conditioning component 212, sodium carbonate as the pH adjuster 213, and sodium polyacrylate as the water-absorbing resin; Example 3: A mixture of sodium formate as the first humidity-regulating component 211, sodium carbonate as the pH adjuster 213, and sodium polyacrylate as the water-absorbing resin; Example 4: A mixture of potassium formate as the first humidity-regulating component 211, sodium carbonate as the pH adjuster 213, and sodium polyacrylate as the absorbent resin; and Example 5: A mixture of potassium acetate as the first humidity-regulating component 211, sodium carbonate as the pH adjuster 213, and sodium polyacrylate as the water-absorbing resin.

[0105] In the samples of Examples 1 to 5, the weight ratio of the first humidity-regulating component 211 to the pH adjuster 213 was 4:1. Furthermore, when the humidity-regulating material 200 contained the first humidity-regulating component 211 and the pH adjuster 213, its total weight to the water-absorbing resin was 5:1.

[0106] like Figure 10 As shown, the samples in Examples 1 to 3 deliquesce at a relative humidity of 50-60%. Using the relative humidity at which deliquescence occurs as a threshold, they rapidly absorb moisture in high-humidity environments with relative humidity exceeding this threshold (hereinafter, this characteristic is referred to as the threshold characteristic). Therefore, when sodium propionate or sodium formate is selected as the first moisture-regulating component 211, the moisture-regulating material 200 absorbs moisture significantly in high-humidity environments with relative humidity exceeding 60%, and can regenerate into a dry state even in low-humidity environments with relative humidity below 50%, without any artificial heating. Specifically, the difference between the moisture absorption rate of sodium formate or sodium propionate at 90% relative humidity and at 40% relative humidity is over 200%, meaning it can absorb and release more than twice the amount of moisture relative to the weight of the moisture-regulating component. Therefore, the moisture-regulating material 200 absorbs moisture during periods of lower temperature and higher relative humidity, such as at night and in the morning, and regenerates during periods of higher temperature and lower relative humidity during the day, resulting in a very large amount of moisture absorbed and released during the day-night cycle, thus preventing condensation.

[0107] Furthermore, in comparing Example 1 and Example 2, by adding the second humidity-regulating component 212 to Example 2, the moisture absorption rate at a relative humidity of 60% or higher becomes greater, the amount of moisture absorbed and released during the day-night cycle becomes very large, and the effect of preventing condensation becomes higher.

[0108] like Figure 10 As shown, the samples in Examples 4 and 5 do not exhibit threshold characteristics, but they deliquesce below 60% relative humidity, and their moisture absorption rate increases sharply as the relative humidity increases. Therefore, if potassium formate or potassium acetate is selected as the first moisture-regulating component 211, the moisture-regulating material 200 will absorb a significant amount of moisture in high-humidity environments with relatively high relative humidity, and can be regenerated to a dry state even without artificial heating in low-humidity environments with relatively low relative humidity. Specifically, the difference between the moisture absorption rate of potassium formate or potassium acetate at 90% relative humidity and at 40% relative humidity is more than 200%, meaning it can absorb and release more than twice the amount of moisture relative to the weight of the moisture-regulating component. Therefore, the moisture-regulating material 200 absorbs moisture during periods of lower temperature and higher relative humidity, such as at night and in the morning, and regenerates during periods of higher temperature and lower relative humidity during the daytime, resulting in a very large amount of moisture absorbed and released during the day-night cycle, thus preventing condensation.

[0109] Thus, the humidity-regulating material 200, which uses sodium propionate, sodium formate, potassium formate, or potassium acetate and sodium carbonate, can achieve a large humidity regulation capacity when the ambient humidity changes, and therefore has excellent humidity-regulating properties. The corrosiveness of sodium propionate, sodium formate, potassium formate, and potassium acetate will be explained later.

[0110] Figure 11AA graph showing the hygroscopic isotherms of sodium propionate, sodium carbonate, and the sample from Example 1. Figure 11B This is a graph showing the hygroscopic isotherms of sodium formate, sodium carbonate, and the sample from Example 3. Figure 11C This is a graph showing the hygroscopic isotherms of potassium formate, sodium carbonate, and the sample from Example 4. Figure 11D This is a graph showing the hygroscopic isotherms of potassium acetate, potassium carbonate, and the sample from Example 5.

[0111] Figures 11A to 11C As shown, adding 1 part by weight of sodium carbonate to 4 parts by weight of sodium propionate, sodium formate, or potassium formate has little effect on the hygroscopic isotherm. Additionally, as... Figure 11D As shown, adding 1 part by weight of potassium carbonate to 4 parts by weight of potassium acetate has little effect on the hygroscopic isotherm. Therefore, even when adding 1 part by weight of sodium carbonate to 4 parts by weight of sodium propionate, sodium formate, and potassium formate, the high humidity-regulating properties of sodium propionate, sodium formate, and potassium formate can be maintained, respectively. Furthermore, even when adding 1 part by weight of potassium carbonate to 4 parts by weight of potassium acetate, the high humidity-regulating properties of potassium acetate can be maintained.

[0112] Next, the results of the corrosion test in the sample containing the first humidity-regulating component 211, pH adjuster 213 and water-absorbing resin will be explained.

[0113] Figure 12 It is a schematic diagram illustrating a corrosion test method.

[0114] like Figure 12 As shown, in the corrosion test, a sealed container 302 was placed inside a constant temperature bath 301. A sample 303 and two types of iron edges 304 were placed inside the sealed container 302. The sample 303 was placed on the inner bottom surface of the container body of the sealed container 302. The two types of iron edges 304 were fixed to the back of the lid of the sealed container 302. The two types of iron edges 304 were: an iron edge exposed to the substrate without being covered by the corrosion-resistant film, and an iron edge covered by the corrosion-resistant film with a portion of the substrate exposed by a cross-section of the corrosion-resistant film. The corrosion-resistant film was formed by tin plating. The temperature inside the constant temperature bath 301 was maintained at 60°C, and the temperature inside the sealed container 302 was also maintained at 60°C. The sample 303 was wetted with water, and the equilibrium humidity of the sample 303 was adjusted to 90%RH. As a result, the humidity inside the sealed container 302 was maintained at 90%RH. After maintaining this state for 3 days, images of the two types of 304 iron edges were taken to obtain images representing the results of the corrosion test.

[0115] Figures 13A to 13D These are images showing the results of corrosion tests on the samples from Examples 6 to 9, respectively. Figure 13E and Figure 13F These are images showing the results of corrosion tests on samples from Comparative Examples 1 and 2, respectively.

[0116] The samples in Examples 6-9 were mixtures as described below.

[0117] Example 6: A mixture of sodium propionate as the first humidity conditioning component 211, sodium carbonate as the pH adjuster 213, and sodium polyacrylate as the water-absorbing resin; Example 7: A mixture of sodium formate as the first humidity-regulating component 211, sodium carbonate as the pH adjuster 213, and sodium polyacrylate as the water-absorbing resin; Example 8: A mixture of potassium formate as the first humidity-regulating component 211, sodium carbonate as the pH adjuster 213, and sodium polyacrylate as the absorbent resin; and Example 9: A mixture of potassium acetate as the first humidity-regulating component 211, sodium carbonate as the pH adjuster 213, and sodium polyacrylate as the water-absorbing resin.

[0118] In the samples of Examples 6-9, the weight ratio of the first humidifying component 211, the pH adjuster 213, and the water-absorbing resin was 4:1:4.

[0119] The sample for Comparative Example 1 was silica gel B. The sample for Comparative Example 2 was a mixture of sodium formate and sodium polyacrylate.

[0120] The pH of the samples in Examples 6 to 9 and the samples in Comparative Examples 1 and 2 were all above 7.

[0121] like Figures 13A to 13E As shown, the samples in Examples 6 to 9 and the sample in Comparative Example 1 did not corrode the two types of iron sheets. On the other hand, as Figure 13F As shown, the samples of Comparative Example 2 corroded both types of iron sheets. Corrosion began from the exposed portion of the substrate. Therefore, it can be determined that the humidity-regulating material 200 composed of sodium propionate, sodium formate, potassium formate or potassium acetate, sodium carbonate, and sodium polyacrylate, and the humidity-regulating material composed of silica gel B, have only low corrosivity. On the other hand, it can be determined that the humidity-regulating material composed of sodium formate and sodium polyacrylate, but without sodium carbonate, has high corrosivity. Considering these factors and the fact that silica gel B has a relatively small amount of moisture absorption and release relative to the weight of the humidity-regulating components, the humidity-regulating material 200, which includes any one of sodium propionate, sodium formate, potassium formate, or potassium acetate as the first humidity-regulating component 211, sodium carbonate as the pH adjuster 213, and sodium polyacrylate as the absorbent resin, has high humidity-regulating function and only low corrosivity.

[0122] The humidity-regulating material of this disclosure is further preferably equipped with pH adjuster 213, as described in detail below.

[0123] The longer the alkyl group in a carboxylic acid, the larger its acid dissociation constant pKa, and the lower its acidity. Therefore, the longer the alkyl group, the easier it is for the carboxylic acid to be released from its salt under acidic conditions. The first humidifying component 211 contains sodium propionate, sodium formate, potassium formate, or potassium acetate. When the absorbent material is an ionic resin, protons are supplied from the absorbent material, acidifying it and releasing an acid with a concentration that produces a noticeable odor, namely propionic acid, formic acid, or acetic acid, from the first humidifying component 211. Therefore, to further reduce odor, the humidifying material 200 preferably also includes a pH adjuster 213. By adjusting the hydrogen ion concentration (pH) of the humidifying material 200 to the alkaline side using the pH adjuster 213, the release of acid can be suppressed, and the odor can be improved. Therefore, the pH adjuster 213 is preferably capable of adjusting the hydrogen ion concentration (pH) of the humidifying material 200 to the alkaline side. Furthermore, since the first humidity-regulating component 211 contains sodium formate, potassium formate, or potassium acetate, when the absorbent material is an ionic resin, protons are supplied from the absorbent material, causing the humidity-regulating material to become acidic, and corrosive formic acid or acetic acid is released from the first humidity-regulating component 211. Therefore, to suppress corrosion, the humidity-regulating material 200 preferably also includes a pH adjuster 213. By using the pH adjuster 213 to adjust the hydrogen ion concentration (pH) of the humidity-regulating material 200 to the alkaline side, the release of acid can be suppressed, thus suppressing corrosion. Therefore, the pH adjuster 213 is preferably capable of adjusting the hydrogen ion concentration (pH) of the humidity-regulating material 200 to the alkaline side.

[0124] Table 4 shows the odor and pH measurement results for various combinations of the types of the first humidity-regulating component 211, the types of water-absorbing resin, the types of pH adjuster 213, and the addition rate of pH adjuster 213. The addition rate of pH adjuster 213 represents the ratio of the weight of pH adjuster 213 to the total weight.

[0125] [Table 4] In Table 4, "improvement" of odor refers to improvement to the point where people can no longer perceive the odor.

[0126] As shown in Table 4, when the first humidity-regulating component 211 is sodium propionate, odor is improved when the pH adjuster 213 is potassium carbonate, sodium carbonate, or dipotassium hydrogen phosphate. Specifically, when the pH adjuster 213 is potassium carbonate or sodium carbonate, odor is significantly improved even with a low addition rate. For example, when the pH adjuster 213 is potassium carbonate, odor is significantly improved when the addition rate is 4.0% or higher; and when the pH adjuster 213 is sodium carbonate, odor is significantly improved when the addition rate is 8.0% or higher. Furthermore, when odor is significantly improved, the hydrogen ion concentration pH of the humidity-regulating material 200 shifts towards the alkaline side.

[0127] On the other hand, when the first humidity-regulating component 211 is sodium propionate, and the pH adjuster 213 is calcium carbonate, the pH of the humidity-regulating material 200 cannot be increased due to its low solubility, and the odor is not improved. Furthermore, when the first humidity-regulating component 211 is sodium propionate, and the pH adjuster 213 is dipotassium hydrogen phosphate, the odor is not improved if the addition rate of the pH adjuster 213 is not 30.0% or higher.

[0128] Therefore, when the first humidity-regulating component 211 is sodium propionate, it is preferable that the pH adjuster 213 contains at least a carbonate. Furthermore, it is more preferable that the pH adjuster 213 is a sodium salt that does not significantly affect the humidity-regulating properties of the first humidity-regulating component 211 or the second humidity-regulating component 212. Additionally, a non-ionic substance may also be used as the pH adjuster 213.

[0129] As shown in Table 4, when the first humidity-regulating component 211 is sodium formate or potassium formate, the odor is also improved when the pH adjuster 213 is sodium carbonate. Furthermore, when the first humidity-regulating component 211 is potassium acetate, the odor is also improved when the pH adjuster 213 is potassium carbonate or sodium carbonate.

[0130] In summary, the humidity-regulating material 200 disclosed herein exhibits low corrosivity, no odor, and high humidity-regulating function by absorbing or releasing moisture.

[0131] [Humidity regulating components] Figure 14 This is a schematic diagram illustrating the humidity-regulating component 100 of this disclosure, and specifically a diagram showing the humidity-regulating component 100 in which the humidity-regulating material 200 is dispersed in a nonwoven fabric. Figure 14 As shown, the humidity regulating component 100 of this disclosure includes the aforementioned humidity regulating material 200 and a carrier 20 that supports the humidity regulating material 200.

[0132] In addition, such as Figure 14 As shown, the humidity-regulating component 100 of this disclosure can also be configured such that the carrier 20 is a non-woven fabric and the humidity-regulating material 200 is dispersed within the non-woven fabric. Non-woven fabric is preferred due to its high water vapor permeability. Therefore, Figure 14 The humidity regulating component 100 shown can be configured as a humidity regulating component with a high surface area to volume ratio, which can accelerate the absorption or release of moisture. In addition, the carrier 20 can be a porous material, woven fabric, or other hydrophilic fibers, in addition to non-woven fabric.

[0133] Furthermore, the moisture-regulating material 200 can be adhered to the surface of the carrier 20 using an adhesive or the like. On the other hand, if the absorbent material also functions as an adhesive, then an adhesive is not required.

[0134] Figure 15This diagram schematically illustrates the humidity-regulating component 100 of this disclosure, and specifically shows the humidity-regulating component 100 in which the humidity-regulating material 200 is disposed between nonwoven fabrics. The humidity-regulating component 100 of this disclosure can be exemplified by sheet-like components. For example... Figure 15 As shown, the humidity-regulating component 100 of this disclosure can also have the carrier 20 be a non-woven fabric, with the humidity-regulating material 200 disposed between the non-woven fabric layers. The humidity-regulating material 200 can be bonded to the carrier 20 simply by using the adhesive 30 dispersed inside. By mixing flame-retardant fibers into the non-woven fabric, the sheet can be made flame-retardant. In addition, the first humidity-regulating component 211 and the second humidity-regulating component 212 can be present in the absorbent body 214, or they can be present in the absorbent body 214 but mixed together.

[0135] Figure 16 This is a schematic diagram illustrating the humidity-regulating component 100 of this disclosure, and also a diagram illustrating a humidity-regulating component in which the humidity-regulating material 200 is disposed on the surface or inside of a breathable substrate. Figure 16 As shown, the humidity-regulating component 100 of this disclosure can also use the carrier 20 as a breathable substrate, and the humidity-regulating material 200 can be disposed on the surface or inside the breathable substrate. As a breathable substrate, a pleated structure, honeycomb structure, etc., are preferred. This increases the surface contact with air and improves the humidity-regulating function.

[0136] As described above, according to this disclosure, a humidity-regulating material 200 and a humidity-regulating component 100 can be provided that improve low corrosivity and have high humidity-regulating function by absorbing or releasing moisture.

[0137] Furthermore, as described above, various embodiments and examples of this disclosure have been described in detail. However, those skilled in the art will readily understand that various modifications can be made without substantially departing from the present disclosure in terms of new features and effects. Therefore, all such modifications are included within the scope of this disclosure.

[0138] For example, a term described at least once in the specification or drawings, along with a different term that is more general or synonymous, may be replaced with that different term anywhere in the specification or drawings. Furthermore, the configuration and operation of the humidity-regulating material and the humidity-regulating component are not limited to the descriptions in the various embodiments and examples of this disclosure, and various modifications can be implemented.

Claims

1. A humidity-regulating material, characterized in that, It possesses: The first moisture-regulating component absorbs or releases moisture; and Absorbent polymer, which contains absorbent material. The first humidity-regulating component is sodium propionate.

2. A humidity-regulating material, characterized in that, It possesses: The first moisture-regulating component absorbs or releases moisture; and Absorbent polymer, which contains absorbent material. The first humidity-regulating component contains at least one selected from the group consisting of sodium propionate, sodium formate, potassium formate, and potassium acetate.

3. The humidity-regulating material according to claim 1 or 2, characterized in that, The humidity-regulating material also contains a pH adjuster.

4. The humidity-regulating material according to claim 3, characterized in that, The pH adjuster alone exhibits alkalinity.

5. The humidity-regulating material according to claim 3 or 4, characterized in that, The pH adjuster contains at least carbonate.

6. The humidity-regulating material according to any one of claims 1 to 5, characterized in that, The humidity-regulating material further includes a second humidity-regulating component, which absorbs or releases moisture. The second humidity-regulating component is a sodium salt with a deliquescence point of 60-90% RH.

7. The humidity-regulating material according to claim 6, characterized in that, The second humidity-regulating component is at least one selected from the group consisting of sodium acetate and sodium carbonate.

8. The humidity-regulating material according to claim 1 or 2, characterized in that, The humidity-regulating material further includes a second humidity-regulating component and a pH adjuster, wherein the second humidity-regulating component absorbs or releases moisture. The second humidity-regulating component is sodium acetate. The pH adjuster is sodium carbonate.

9. The humidity-regulating material according to any one of claims 1 to 8, characterized in that, The absorbent material contains at least one selected from the group consisting of absorbent resins and clay minerals.

10. The humidity-regulating material according to claim 9, characterized in that, The absorbent resin contains sodium polyacrylate.

11. A humidity regulating component, characterized in that, It possesses: The humidity-regulating material according to any one of claims 1 to 10; and A carrier that supports the humidity-regulating material.

12. The humidity regulating component according to claim 11, characterized in that, The carrier is non-woven fabric. The moisture-regulating material is disposed between the nonwoven fabrics.

13. The humidity regulating component according to claim 11, characterized in that, The carrier is non-woven fabric. The moisture-regulating material is dispersed on the nonwoven fabric.

14. The humidity regulating component according to claim 11, characterized in that, The carrier is a breathable substrate. The moisture-regulating material is disposed on the surface or inside the breathable substrate.

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