Humidity-regulating and deodorizing material and method for manufacturing the same

Abstract

To provide a humidity-regulating and deodorizing building material that can be molded at low pressure while maintaining the humidity-regulating and deodorizing functions of rhyolitic tuff powder, and a method for manufacturing the same, which can improve productivity, since it is practically impossible to use raw materials with humidity-regulating and deodorizing effects as building materials without molding them, both in terms of distribution as building materials and on-site work, and a method for molding them while maintaining their humidity-regulating and deodorizing functions is required.SOLUTION: The manufacturing method includes the steps of: adding a colloidal silica dispersion to a specific composition of porous rock powder, inorganic powder with a high specific surface area, and calcium carbonate and / or hydrated lime, and kneading the mixture; filling the kneaded mixture into a predetermined molding frame; pressurizing and molding the same; and drying the same, followed by hardening.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a humidity-regulating and odor-eliminating building material and a manufacturing method thereof, which maintains the humidity-regulating and odor-eliminating functions of porous rocks such as rhyolitic welded tuff, Kanuma clay, zeolite, and other inorganic powders with a high specific surface area, while imparting strength without sintering, and to a manufacturing method thereof. [Background technology]

[0002] Many humidity-conditioning building materials have been reported in the past, including those made by mixing and firing sustained-release materials such as zeolite or diatomaceous earth with building materials solidified with a setting hardener such as cement or gypsum, or clay, and those that utilize the moisture absorbing and releasing properties of alumina produced by dehydrating aluminum hydroxide (Patent Documents 1 to 5). While all of these require a firing step, Patent Documents 6 to 8 disclose methods for producing humidity-conditioning building materials without a firing step. Specifically, Patent Document 7 discloses a method for producing a humidity-conditioning building material comprising a hardened body of a composition containing slaked lime and / or quicklime, lime sand, porous stone powder, clay, a porous clay mineral, and a calcium ion-containing aqueous solution, in which the material is press-molded from a clay comprising the specific composition, and then dried and hardened to form a hardened body.

[0003] For example, Patent Document 6 discloses a humidity-regulating building material made by mixing powder of rhyolitic welded tuff known as Tatsuyama stone, which is found in the area from Takasago City to Kasai City in Hyogo Prefecture, with gypsum hemihydrate as a binder that hardens at room temperature, and water, and then pouring the mixture into a mold and allowing it to dry naturally. In addition to gypsum hemihydrate, cement and other binders that harden at room temperature are also listed. The same document also discloses a humidity-regulating building material made by mixing powder of Tatsuyama stone, clay, and water, molding the mixture in a container, and then naturally drying and firing it.

[0004] Patent Document 8 discloses a humidity-regulating building material comprising a hardened composition containing slaked lime and / or quicklime, lime sand, powder of rhyolitic welded tuff found in the area from Takasago City to Kasai City in Hyogo Prefecture, clay, porous clay mineral, and a Ca ion-containing aqueous solution. The humidity-regulating building material is produced by press-molding a clay mixture containing the specific composition, drying and hardening the resulting pressed body. Patent Document 9 discloses a plaster wall material technology that utilizes the excellent humidity-regulating properties of powder of rhyolitic welded tuff found in the area from Takasago City to Kasai City in Hyogo Prefecture. Non-Patent Document 1 also discloses that crushed rhyolitic welded tuff may be used as a coating material with excellent humidity-regulating properties.

[0005] Meanwhile, Patent Document 10 discloses a humidity-conditioning material obtained by carbonating a hydrous compact made of a mixed powder of slaked lime, inorganic waste powder, and inorganic powder with a high specific surface area. Among these, dried powders of Kanuma earth, natural zeolite, and diatomaceous earth are disclosed as inorganic powders with a high specific surface area. It is disclosed that when inorganic powder with a high specific surface area is added, the amount of moisture absorption and desorption is greater than that of a sample without the addition, and therefore, adding inorganic powder with a high specific surface area can provide a high humidity-conditioning function. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 4-354514 [Patent Document 2] Japanese Patent Application Publication No. 3-109244 [Patent Document 3] Japanese Unexamined Patent Publication No. 11-11939 [Patent Document 4] Japanese Patent Application Laid-Open No. 2001-122657 [Patent Document 5] Japanese Patent Application Laid-Open No. 2012-188307 [Patent Document 6] Japanese Patent Application Publication No. 2018-076198 [Patent Document 7] JP 2023-146855 A [Patent Document 8] JP 2023-146854 A [Patent Document 9] Re-tabled publication 2016 / 067992 [Patent Document 10] Japanese Patent Application Laid-Open No. 2006-027999 [Non-patent literature]

[0007] [Non-Patent Document 1] University of Tsukuba "The Seeds of Science" 2012 Summary of the Invention [Problem to be solved by the invention]

[0008] Using materials with humidity-regulating and deodorizing properties as building materials without molding them is virtually impossible in terms of distribution as building materials and on-site work. To solve this problem, they generally need to be processed into building materials such as tiles. However, conventional humidity-regulating and deodorizing building materials, which are formed by pouring the materials into molds, have low productivity. When cement is used as a binder that hardens at room temperature, the hardening rate increases, resulting in a humidity-regulating building material with relatively high strength, but with reduced moisture absorption and desorption performance. Furthermore, conventional humidity-regulating building materials obtained by firing are easy to achieve strength, but require a firing process, which results in low productivity and high firing costs. Therefore, the objective of this invention is to provide a humidity-regulating and deodorizing building material that can be molded without a firing process while retaining the moisture absorption and desorption properties of natural rock, and a method for manufacturing the same. In other words, the objective is to find a binding functional material that retains the functions of a humidity-regulating and deodorizing material, has effective strength as a building material, and can be easily molded and processed. [Means for solving the problem]

[0009] The inventors of the present invention have conducted extensive research to solve the above-mentioned problems, and as a result have completed a means for solving the above-mentioned problems by using a binder different from conventionally known binders for materials with humidity-regulating and deodorizing functions. Specifically, they have discovered that by kneading a mixture of porous rock powder, which is a humidity-regulating and deodorizing material, particularly rhyolitic tuff powder, or a high-specific-surface-area inorganic powder with a colloidal silica dispersion containing calcium carbonate and / or hydrated lime as a binder and solidifying it, it is possible to provide a humidity-regulating and deodorizing building material that can be pressure-molded while retaining its humidity-regulating and deodorizing functions, and a method for manufacturing the same, thereby completing the present invention.

[0010] The present invention comprises the following configurations. (1) A humidity-regulating and deodorizing building material, characterized in that porous rock powder and inorganic powder with a high specific surface area, which have humidity-regulating and deodorizing functions, are molded and processed with a binding functional material made by adding calcium carbonate and / or hydrated lime to colloidal silica. (2) A humidity-regulating and odor-eliminating building material according to (1) above, to which at least one additive selected from clay, clay minerals, kansui stone granules, and oyster shell powder has been added. (3) When a material that has reached a constant weight in an atmosphere of 25°C and 50% relative humidity is placed in contact with air at 25°C and 75% relative humidity for 12 hours, the moisture absorption is at least 60 g / m 2 The humidity-regulating and deodorizing building material according to (1) or (2) above, characterized in that: (4) A method for manufacturing a humidity-regulating and deodorizing building material, comprising the steps of: kneading a material mixture of porous rock powder and inorganic powder with a high specific surface area, or a material mixture of the material mixture to which at least one additive selected from clay, clay minerals, granular granules of kansui stone and oyster shell powder has been added, with a specific composition consisting of calcium carbonate and / or slaked lime, adding a colloidal silica dispersion; filling the kneaded mixture into a predetermined molding frame; molding under pressure; and drying. [Effects of the Invention]

[0011] The humidity-conditioning and deodorizing building material of the present invention can be produced without pouring raw materials into a mold or firing, thereby improving productivity. In addition, the humidity-conditioning and deodorizing building material of the present invention can be produced by pressing (267 kgf / cm 2 ~1,067kgf / cm 2 (2.62×10 7 N / m 2 ~10.46×10 7 N / m 2 ), 2×10 4 Kgf / sheet ~8×10 4 Because the material can be molded at a rate of 5 kgf / sheet (5 cm x 15 cm), the molds used for molding do not require the same strength as conventional molds, allowing for easy and inexpensive creation of any shape or design using a three-dimensional printer. Therefore, molds can be easily and flexibly modified, allowing for precise response to consumer needs, thereby contributing to improved product value. Furthermore, the humidity-regulating and deodorizing building material of the present invention is composed of a hardened product of a specific composition containing a porous rock powder with humidity-regulating and deodorizing properties and a binding functional material made by adding calcium carbonate and / or hydrated lime to colloidal silica, thereby ensuring moisture absorption and desorption performance and strength. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a photograph of an example of the humidity-regulating and odor-eliminating building material of the present invention (Example 1). [Figure 2] FIG. 2 is a diagram showing the moisture absorption and desorption performance of test piece 4 of the humidity-conditioning and deodorizing building material of the present invention. [Figure 3] FIG. 3 is a diagram showing the moisture absorbing and releasing performance of test specimen 11 of the humidity-conditioning and deodorizing building material of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] The humidity-regulating and deodorizing building material of this invention is prepared by mixing a mixture of humidity-regulating and deodorizing materials containing porous rock powder with humidity-regulating and deodorizing properties, such as rhyolitic tuff powder typified by Tatsuyama stone, and high-specific-surface-area inorganic powder, such as Kanuma clay or zeolite, with a binder consisting of a colloidal silica dispersion and calcium carbonate and / or slaked lime, adjusting the mixture to a moldable viscosity, filling it into a specified molding frame, press-molding it, and drying it. The combined action of colloidal silica and calcium carbonate and / or slaked lime ensures the strength of the pressed compact, while allowing it to be molded into any shape without impairing the humidity-regulating and deodorizing properties of the porous rock and high-specific-surface-area inorganic material, resulting in an innovative manufacturing method and a highly functional product.

[0014] The mixing ratio of the powder mixture, prepared by adding calcium carbonate and / or hydrated lime to porous rock powder (e.g., Tatsuyama stone) and high-surface-area inorganic powder (e.g., Kanuma clay or zeolite), and the blending ratio of the colloidal silica dispersion used for kneading can be determined appropriately based on the desired humidity-conditioning and deodorizing performance and the required strength of the molded product. Furthermore, other components can be blended into the dispersion medium in addition to the colloidal silica dispersion. As long as the desired humidity-conditioning and deodorizing performance is maintained, appropriate amounts of Portland cement, white cement, various silicate compounds, gypsum, etc. can also be added. Pigments can also be added to color the product.

[0015] It is also within the scope of the present invention to further add at least one additive selected from the group consisting of porous rock powder, such as Tatsuyama stone, and inorganic powder with a high specific surface area, such as Kanuma clay or zeolite, clay, for example, clay used as a roofing tile material from Awaji Island, Hyogo Prefecture, clay minerals, kansui stone fine particles, and oyster shell powder.

[0016] The humidity-conditioning and deodorizing building material of the present invention can be produced by press-molding a clay made primarily from a specific composition (hereinafter referred to as the specific composition) containing porous rock powder, a high-specific-surface-area inorganic powder, colloidal silica, and calcium carbonate and / or slaked lime, and then drying and hardening the resulting press-molded body to form a hardened body. The strength of the press-molded body can be ensured by the combined action of the colloidal silica and calcium carbonate and / or slaked lime contained in the specific composition. Therefore, the humidity-conditioning and deodorizing building material of the present invention can be produced without firing, thereby improving productivity. Furthermore, because the humidity-conditioning and deodorizing building material of the present invention is composed of a hardened body of the specific composition, it can ensure moisture absorption and desorption performance and strength.

[0017] Examples of porous rocks that constitute the porous rock powder include rhyolitic welded tuffs distributed from Takasago City to Kasai City in Hyogo Prefecture, specifically, Tatsuyama stone, feldspar, and Takamuro stone. Other examples include natural pumice from Towada Volcano (hereinafter referred to as Lake Towada pumice), koga stone from Niijima Island in the Izu Islands (hereinafter referred to as Niijima koga stone), and bakuhan stone from Mino Shirakawa in Gifu Prefecture (hereinafter referred to as Mino Shirakawa bakuhan stone). However, the porous rock powder is not limited to these, and various types of porous rocks can be used as long as they have moisture absorption and desorption properties. One or more types of porous rocks can be used in combination. Among these, Tatsuyama stone, a type of rhyolitic muro tuff, is preferred for its high hardness and viscosity, ease of processing, and rich color. This powder is particularly useful for the present invention due to its moisture absorption and desorption properties.

[0018] High-surface-area inorganic powders include porous clay mineral powders such as Kanuma soil, Akadama soil, zeolite, sepiolite, acid clay, and Oya stone. Among these, Kanuma soil is a general term for pumice produced in Kanuma City, Tochigi Prefecture, used in agriculture and horticulture. Its shape is rounded. Although it is called soil, it is actually weathered pumice, with a compressive strength that allows it to be crushed with a finger. Zeolite, also known as zeolite, is a porous, high-surface-area inorganic material known as a humidity-regulating and deodorizing material. Powders of one or more of the above high-surface-area inorganic powders can be mixed appropriately. Using these makes it easier to adjust the mixing condition of the specific composition when preparing the clay. High-surface-area inorganic powders have adsorption properties, which can contribute to preventing a decrease in the moisture absorption and desorption performance of humidity-regulating and deodorizing building materials.

[0019] The dispersion medium used to knead the mixture of porous rock powder, high-surface-area inorganic powder, and calcium carbonate and / or slaked lime is preferably a colloidal silica dispersion in which colloidal silica with a particle size of 5 to 80 nm is dispersed in water at a concentration of 20 to 50 (W / V)%. For example, a product under the trade name (Snowtec, manufactured by Nissan Chemical Industries, Ltd.) can be used. The particle shape of the colloidal silica is selected to be suitable for enhancing the bonding between the porous rock powder and the high-surface-area inorganic powder in cooperation with the calcium carbonate and / or slaked lime. Calcium carbonate can be commercially available powder, or calcium carbonate derived from discarded eggshells or seashells. Slaked lime can be commercially available powder. The combination of colloidal silica dispersion with calcium carbonate and / or slaked lime is suitable for exerting its binder function by enhancing the interparticle adhesion effect of the silica colloid.

[0020] The proportions of each component in the specific composition may be 20 to 55%, more preferably 25 to 50%, for porous rock powder, 10 to 40%, more preferably 15 to 35%, for high-specific surface area inorganic powder, 5 to 35%, more preferably 10 to 25%, for calcium carbonate and / or slaked lime, and 10 to 30%, more preferably 15 to 30%, for colloidal silica. As long as the content of calcium carbonate and / or slaked lime is within the above ranges, calcium carbonate alone, slaked lime alone, or a combination of both may be used as appropriate. The proportions of the above components are selected so that the total sum is 100%. The upper and lower limits of the proportions of the above components can be arbitrarily combined. Pigments and other additives, such as Portland cement, white cement, various silicate compounds, and gypsum, may also be mixed. Their proportions may be, for example, 0.1% to 5% of the total proportion of the above components (100%). The proportions of the above components are in weight percent.

[0021] Within the range of each component of the specific composition described above, one or more of the following may be further added in an amount of 5 to 28%: clay or clay mineral powder (e.g., chlorite) from Awaji Island, Hyogo Prefecture; fine granulated kansui stone from Ibaraki Prefecture; and commercially available oyster shell powder. The amounts of these clay mineral powders, fine granulated kansui stone, and oyster shell powder are appropriately selected within a range that does not exceed the amount of the porous rock powder.

[0022] The specific composition was kneaded to be uniform, and then placed in a predetermined mold prepared in advance, measuring 5 × 15 cm (75 cm 2 The molded product was then removed from the mold and forcedly dried with hot air at 100°C for 8 hours. The pressure can be adjusted depending on the composition or shape of the humidity-conditioning and deodorizing building material to be prepared, the working environment, etc.

[0023] The shape of the humidity-conditioning and deodorizing building material of this embodiment is not particularly limited, but may be, for example, a tile shape. That is, the humidity-conditioning and deodorizing building material of this embodiment can be suitably used as humidity-conditioning and deodorizing tiles.

[0024] As described above, the humidity-conditioning and deodorizing building material of this embodiment is composed of a hardened body obtained by hardening the specific composition. Specifically, the humidity-conditioning and deodorizing building material of this embodiment is composed of a hardened body obtained by drying and hardening a press-molded body of the specific composition. In other words, the hardened body that constitutes the humidity-conditioning and deodorizing building material of this embodiment is not fired. Even though the hardened body is not fired, the humidity-conditioning and deodorizing building material of this embodiment exhibits the unexpected and remarkable effect of being able to ensure high strength while maintaining the humidity-conditioning and deodorizing functions of the raw materials.

[0025] The humidity-conditioning and deodorizing building material of this embodiment can be manufactured as follows, but is not limited to this. The manufacturing method of the humidity-conditioning and deodorizing building material of this embodiment includes a clay preparation step, a press molding step, and a drying and curing step, but does not include a firing step.

[0026] The clay preparation step involves preparing a clay consisting of the specific composition, which includes a powder of rhyolitic welded tuff found in the area from Takasago City to Kasai City in Hyogo Prefecture, a high-specific-surface-area inorganic powder, calcium carbonate powder and / or slaked lime powder, and a colloidal silica dispersion. The clay consisting of the specific composition can be prepared, for example, by blending the components, kneading them in a kneading machine such as a clay kneader, and then finely pulverizing them using a grinder such as a desinter. The moisture content of the specific composition can be approximately 7% to 15% by mass (this may be adjusted by adding water).

[0027] The press molding process is a process in which the clay prepared in the clay preparation process is press molded to obtain a press molded body. A dry press molding machine can be suitably used as the press molding machine. The press molded body can have a shape with surface irregularities, such as the surface of a stone. The thickness of the press molded body can be, for example, 8 mm or more and 25 mm or less.

[0028] The drying and curing process is a process in which the press-molded body is dried and cured to form a hardened body, thereby obtaining a humidity-regulating and odor-eliminating building material. The press-molded body can be dried either naturally or by forced drying using a dryer, but forced drying is preferably used from the viewpoint of productivity, etc. In this case, the drying temperature can be about 80°C to 120°C. The drying time can be about 6 to 12 hours.

[0029] The manufacturing method of the humidity-conditioning and deodorizing building material of this embodiment described above can manufacture the humidity-conditioning and deodorizing building material of this embodiment without firing, thereby improving the productivity of the humidity-conditioning and deodorizing building material. Furthermore, since the specific composition does not contain slag like plaster materials, the manufacturing method of the humidity-conditioning and deodorizing building material of this embodiment is less likely to cause problems with kneading the specific composition, which is advantageous for improving productivity. [Example]

[0030] The humidity-regulating and deodorizing building material of the present invention will be described below with reference to examples. <Raw material preparation> The following raw materials were prepared: Powder of rhyolitic welded tuff distributed from Takasago City to Kasai City, Hyogo Prefecture. Powder of Tatsuyama stone (grain size 0.5 mm or less). High surface area inorganic powder: Crushed Kanuma soil for gardening, zeolite (manufactured by Shinko Sunrise Co., Ltd.) ·Calcium carbonate powder···First-class calcium carbonate Slaked lime (calcium hydroxide) powder Grade 1 calcium hydroxide Colloidal silica dispersion (particle size 40 nm, 30% dispersion, manufactured by Nissan Chemical Industries, Ltd.) Additives: Fine granules of kansui stone (approx. 1 mm in diameter), oyster shell powder

[0031] <Clay preparation> Each clay was obtained by kneading a mixture of rhyolitic welded tuff powder, inorganic powder with a high specific surface area, calcium carbonate powder, and / or slaked lime powder with a colloidal silica dispersion in the proportions shown in Table 1. When an additional material was added, each additional material was mixed with a mixture of rhyolitic welded tuff powder, inorganic powder with a high specific surface area, calcium carbonate powder, and / or slaked lime powder, and the mixture was kneaded with a colloidal silica dispersion to obtain each clay.

[0032] <Press molding> Each of the obtained clays was press-molded using a uniaxial pressure dry press molding machine [100 ton (980 KN) press] at a pressure of 20 to 80 tons (196 to 784 KN) to obtain each press-molded body. The outer dimensions of the press-molded body were approximately 50 mm x 150 mm. Therefore, the unit area (m 2 ) is the pressure per 7 N / m 2 ~10.46×10 7 N / m 2 The thickness of the press-molded body was approximately 15 mm. After molding, the molded body was observed to see whether it could be removed from the mold and for its brittleness and strength. The obtained test specimens 1 to 17 were evaluated as described below.

[0033] <Drying, curing> Each press-molded body was placed in a dryer and forcedly dried at 100°C for 8 hours to harden into a hardened body. The resulting humidity-controlling and deodorizing building materials are intended for use as humidity-controlling and deodorizing tiles for interior use.

[0034] <Evaluation> -Productivity- The above-mentioned test specimens were not sintered during production. Therefore, good press moldability was obtained when each test specimen was press molded, and productivity could be improved by press molding. Therefore, the press moldability of each test specimen was evaluated. Specifically, productivity was judged to be poor when the clay was too strongly adhered to the mold and press molding was not possible, or when press molding was possible but the strength of the press-molded body was low and the press-molded body was brittle and crumbled. Productivity was judged to be good when the press-molded body could be molded without such problems.

[0035] -Moisture absorption and release test (humidity control test)- Each specimen was subjected to a moisture absorption / desorption test in accordance with JIS A1470-1:2014, "Test Methods for Moisture Absorption / Desorption of Building Materials - Part 1: Humidity Response Method." Specifically, the specimen was placed on a general-purpose electronic balance (A&D Co., Ltd., FZ-3000i, weighing capacity 3200 g, minimum display 0.01 g) installed in a constant temperature and humidity chamber (Espec Corporation, built-in chamber TBE-2HW5G3A). The chamber's atmosphere was maintained at 25°C and 50% RH, and the specimen was allowed to cure until a constant weight was reached. After curing, the chamber was maintained at 25°C and 75% RH for 12 hours, followed by another 12 hours at 25°C and 50% RH. The mass at the start of the test was compared with the mass after each elapsed time. This allowed the relationship between elapsed time and the amount of moisture absorption / desorption for each specimen to be measured.

[0036] -Bending strength- A three-point bending test (n=3) was performed on each specimen, and the arithmetic mean value of the bending strength measurements was taken as the bending strength. Note that if the results of productivity and moisture absorption / desorption performance were poor, the bending strength measurement was omitted.

[0037] -Adsorption test- Each specimen was subjected to an ammonia gas and formaldehyde gas adsorption test. Specifically, the specimen was placed in a 10L gas collection bag and sealed, and 10L of nitrogen gas containing approximately 120ppm to 150ppm of ammonia and approximately 110ppm to 125ppm of formaldehyde was transferred into the gas collection bag, and the gas concentrations were measured at regular intervals using the detector tube method.

[0038] - Deodorization test - Each test specimen was subjected to a sensory test to deodorize the ammonia gas and formaldehyde gas used in the adsorption test, as well as isovaleric acid and acetic acid. Each test specimen was placed in a sealed container filled with ammonia gas, formaldehyde gas, isovaleric acid gas, or acetic acid gas, and after sealing and leaving it at room temperature for 3 hours, the deodorizing effect was confirmed by a sensory test. The results are summarized in Table 4.

[0039] Table 1 shows the blending ratio of each composition used to prepare each test specimen, Table 2 shows the productivity, moisture absorption / desorption performance, and bending strength of each test specimen, Table 3 shows the malodorous gas adsorption effect of each test specimen, and Table 4 shows the performance of each test specimen in the deodorizing sensory test. Reference products 1 and 2 are humidity-conditioning and deodorizing building materials prepared by the methods described in Patent Documents 6 and 7, respectively. In addition, Figure 1 shows examples of molded products, and Figure 2 shows the results of the moisture absorption / desorption test for test specimen 4.

[0040] (Table 1) Composition of each test specimen JPEG2025155670000002.jpg10882

[0041] (Table 2) Performance comparison test of each test piece JPEG2025155670000003.jpg8787N.T is untested

[0042] (Table 3) Deodorizing performance test for each test piece TIFF2025155670000004.tif52108

[0043] (Table 4) Odor-eliminating sensory test for each test piece JPEG2025155670000005.jpg3995From Tables 1 to 4 and Figures 1 to 3, the following can be seen.

[0044] Specimen 1 was made by mixing only rhyolitic tuff powder (Tatsuyama stone) with calcium carbonate and colloidal silica and molding it; Specimen 2 was made by mixing only high-surface-area inorganic powder (Kanuma soil) with calcium carbonate and colloidal silica and molding it; Specimens 3 and 4 were made by mixing a composition containing both rhyolitic tuff powder (Tatsuyama stone) and high-surface-area inorganic powder with calcium carbonate and colloidal silica and molding it; and Specimen 5 was made by mixing a composition containing both rhyolitic tuff powder (Tatsuyama stone) and high-surface-area inorganic powder with hydrated lime and colloidal silica and molding it. While the rhyolitic tuff powder (Tatsuyama stone) alone exhibited a considerable amount of moisture absorption, the mixture containing both Tatsuyama stone and Kanuma soil was found to have significantly higher moisture absorption capacity. Furthermore, it was found that the humidity-regulating and deodorizing building material of the present invention has significantly higher moisture absorption performance than Reference Products 1 and 2, which are not mixed with calcium carbonate or slaked lime and colloidal silica. Molding using only Kanuma clay, an inorganic powder with a high specific surface area, was unable to maintain its shape. From the above results, it became clear that the humidity-regulating and deodorizing building material of the present invention, which is made by mixing and molding porous rock powder and inorganic powder with colloidal silica and calcium carbonate or slaked lime, has significantly higher moisture absorption and release performance than conventional humidity-regulating and deodorizing building materials, and is also easy to produce, making it possible to provide a highly functional humidity-regulating and deodorizing building material.

[0045] The bending strength was found to be equal to or greater than that of the reference product, making it usable as a building material.

[0046] In terms of productivity, the method of the present invention has the great advantage that it can be molded using a low-pressure press, does not require special molds, molds can be prepared using a 3D printer, and products with a wide range of designs can be produced.

[0047] It was also confirmed that the test specimens 3, 4 and 5 of the present invention have the ability to adsorb the odors of ammonia gas and formaldehyde gas, and can also exhibit deodorizing performance.

[0048] The present invention is not limited to the above-described embodiments and examples, and various modifications are possible without departing from the spirit of the present invention. Furthermore, the configurations shown in the embodiments and examples can be combined in any manner. [Industrial Applicability]

[0049] It can be used as a building material with humidity-regulating and deodorizing functions and as a manufacturing method for such a material.

Claims

1. This humidity-regulating and odor-eliminating building material is characterized in that it is made by molding porous rock powder and inorganic powder with a high specific surface area, which have humidity-regulating and odor-eliminating functions, with a binding functional material made by adding calcium carbonate and / or slaked lime to colloidal silica.

2. 2. A humidity-regulating and odor-eliminating building material according to claim 1, to which at least one additive selected from the group consisting of clay, clay minerals, kansui stone fine particles, and oyster shell powder has been added.

3. When a material that has reached a constant weight in an atmosphere of 25°C and 50% relative humidity is brought into contact with air of 75% relative humidity at 25°C for 12 hours, the moisture absorption amount is at least 80 g / m ２ 3. The humidity-regulating and odor-eliminating building material according to claim 1 or 2, wherein

4. A method for producing a humidity-regulating and odor-eliminating building material, comprising the steps of: kneading a material mixture of porous rock powder and inorganic powder with a high specific surface area, or a material mixture obtained by adding at least one additive selected from clay, clay minerals, kansui stone fine particles, and oyster shell powder to the material mixture; adding a colloidal silica dispersion to a specific composition consisting of calcium carbonate and / or slaked lime; filling the kneaded mixture into a predetermined molding frame; pressurizing and molding; and drying.

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