JP6166965B2 - Method for producing moisture-conditioning building material and method for producing moisture-conditioning building material - Google Patents

Description

  The present invention relates to a humidity control building material, a method for producing the same, and a cosmetic humidity control building material based on the humidity control building material, and more specifically, has a high moisture absorption / release performance, is lightweight, and has excellent dimensional stability, The present invention relates to a humidity-controlling building material having high strength, a production method thereof, and a makeup-controlling building material based on the humidity-controlling building material.

  At present, inorganic boards used as general building materials include, for example, cement-based, gypsum-based, and calcium silicate-based materials. These inorganic plates are usually produced by methods such as papermaking and press molding. As raw materials for the inorganic board, both cement-based, gypsum-based and calcium silicate-based materials usually use matrix-forming raw materials and fiber raw materials as essential raw materials, and in addition to these essential raw materials, in order to impart necessary properties, Inorganic fillers are used in combination.

  In recent years, with the improvement of high heat insulation technology, the airtightness of houses and other buildings has been advanced, and the indoor temperature environment and the energy saving level have been improved. On the other hand, there are a lot of harmful effects such as indoor humidification and condensation in the cold season. It can be solved by introducing a ventilation system, but it is not practical in small offices and general households. Therefore, a humidity control building material in which a humidity control function is given to an interior wall material has been proposed.

For example, Patent Document 1 discloses a hydratable raw material for forming a matrix of 20 to 60% by mass; an inorganic filler of 1 to 50% by mass; a reinforcing fiber (excluding asbestos) of 3.5 to 12% by mass; A mixture containing 10 to 50% by mass of calcium silicate hydrate obtained by hydrothermal synthesis of an acid raw material is wet-mixed to obtain a slurry, and the raw slurry is made by making the resulting slurry. In the method for producing an inorganic papermaking plate comprising subjecting the obtained green plate to pressure dehydration, followed by curing and curing, the average particle size of the calcium silicate hydrate is in the range of 30 μm to 100 μm, The reinforcing fiber has a freeness of 3 to 11% by weight of natural fibers and a fiber length of 6.0 to 0.2 mm in a Canadian standard freeness range of 150 to 450 ml, and a fiber diameter of 20 to 50 μm. inorganic A thin film comprising 0.5 to 5% by mass of fiber and / or synthetic fiber, the dehydration rate of the thin film on the endless felt in the paper making process being in the range of 5 to 30% / second, and being wound on a making roll The apparent density of the green plate after separation from the making roll is set to a range of 0.35 to 0.65 g / cm ³ by setting the moisture content of the green plate to 100 to 180%. A method for producing an inorganic papermaking board, characterized in that the apparent density of the green board after pressure dehydration is within a range of 1.3 to 2.0 times the apparent density of the green board before pressure dehydration (Claim 1). An inorganic papermaking plate obtained by the method for producing an inorganic papermaking plate, wherein the moisture absorption and desorption amount between 23 ° C-75% RH and 23 ° C-53% RH of the inorganic papermaking plate is 30 g / m ^2; Inorganic papermaking board characterized by the above Claim 6) is disclosed.

Further, Patent Document 2 is composed of a mixed nourishing organism of fiber, a humidity-controlling substance, and cement, and has a specific gravity of 1.2 g / cm ³ or less, and the fiber forms an aggregate that is bonded and closely adhered to the matrix at a point. The fiber-controlled humidity control board is characterized in that the surface of the board and the internal gap are 50 to 500 μm, and the minor axis diameter of the fiber aggregate is 1 to 5 times the fiber diameter. The fiber-controlled humidity control board is characterized in that the humidity-controlling substance is made of zeolite, and the fiber is made of pulp, vinylon, wollastonite, sepiolite, or a combination of two or more thereof. A mixture of fiber, zeolite, cement and water is made by a papermaking method at a papermaking speed of 20 to 60 m / min. And papermaking in the conditions of a roll pressure 1~5kgf / cm ^2, and curing thereafter, fiber-controlled tone production method of the wet board, which comprises forming aggregates of fibers joined close contact with the matrix and the point ( 6); The mixture comprises 3 to 10% by weight (mass%) of fibers, 10 to 80% by weight (mass%) of zeolite, and 10 to 80% by weight (mass%) of cement, and the mixture has a thickness of 4 A method for manufacturing the fiber-controlled humidity control board (claim 7), characterized in that papermaking is performed to ˜20 mm. [0019] In the column [0019] of Patent Document 2, “in the fiber-controlled humidity control board, the porous powder or granular material used as the humidity control substance includes, for example, zeolite, cristobalite, attapulgite, calcium silicate, It is a granular material having water absorption / adsorption action, such as diatomaceous earth, kaolin, montmorillonite, vermiculite, activated alumina, silica gel, activated carbon, porous crosslinked organic polymer compound, and a mixture of two or more of these. There is also a statement that zeolite is the most preferable as a granule.

JP 2005-205879 A Japanese Patent No. 3328767

The inorganic papermaking plate described in the above-mentioned Patent Document 1 is characterized in that a slurry-like calcium silicate hydrate synthesized in advance is used as a raw material, and the calcium silicate hydrate slurry is Cement-based materials have excellent mechanical properties such as strength and toughness, and have a certain degree of humidity control performance. However, as a humidity control building material, further improvement in moisture absorption / release performance is required.
Further, Patent Document 2 discloses zeolite, diatomaceous earth, silica gel, and the like as humidity control substances that can be used for the humidity control board. Among these, silica gel can be expected to have a high humidity control effect. When used as a primary raw material, Ca produced by hydration of cement used as a hydratable raw material causes a pozzolanic reaction on the surface of silica gel, which is an amorphous substance, to produce C—S—H. Since the surface of the silica gel is covered, there is a problem that the moisture absorption / release performance of the silica gel cannot be sufficiently exhibited at present. Furthermore, there is a problem that sufficient moisture absorption / release performance cannot be imparted even if zeolite or diatomaceous earth is used as a humidity control substance.

  Therefore, the object of the present invention is to sufficiently exhibit the high moisture absorption and release performance of silica gel when using silica gel as a humidity control substance in a cement-based material, and is lightweight, excellent in dimensional stability, and high in strength. An object of the present invention is to provide a humidity-controlling building material, a method for producing the same, and a makeup-controlling building material based on the humidity-controlling building material.

As a result of intensive studies to solve the above-mentioned problems, the present inventors have used a silica gel and calcium silicate hydrate slurry in combination in a cementitious material. It has been found that moisture-releasing performance can be obtained, weight reduction can be achieved, dimensional stability is excellent, and high strength can be obtained, and the present invention has been completed.
That is, according to the present invention, a calcium silicate hydrate slurry obtained by hydrothermal synthesis of a calcareous raw material and a siliceous raw material in advance is 20 to 60% by mass of cement, and 5 to 50% by mass in terms of solid content, and silica gel 1 to 15%. A mixture containing 1% by mass, 1-50% by mass of an inorganic filler and 3-12% by mass of reinforcing fibers is wet-mixed to obtain a slurry, and a green board is obtained by making the resulting slurry. A method for producing a humidity-control building material, wherein the green board is dehydrated and then cured and cured, and the moisture content of the thin film when winding the thin film on a making roll in a papermaking process is 80 to 160%. And the press pressure in the pressure dehydration step is 2 to 30 MPa.

Moreover, this invention is the humidity control building material obtained by the said manufacturing method, Comprising: In medium humidity range based on JIS A1470-1 "The moisture absorption-release test method of building materials-1st part: Humidity response method" In the moisture absorption / release performance test, the moisture absorption after 3 hours in the moisture absorption process (23 ± 0.5 ° C.-75% RH) is 15 g / m ² or more, the moisture absorption after 6 hours is 20 g / m ² or more, 12 The moisture absorption after time is 29 g / m ² or more, and the moisture release after 12 hours in the moisture release process (23 ± 0.5 ° C.-50% RH) is 70% or more of the total moisture absorption, Bending strength is in the range of 10-30 N / mm ² , apparent density is in the range of 0.5-1.2 g / cm ³ , and length change rate is in the range of 0.20% or less. the near-Ru moisture control construction material as a base material, a process for the preparation of a cosmetic moisture control construction material consisting of providing a decorative layer on the substrate surface, is obtained In the moisture absorption and desorption performance test in the middle humidity range in accordance with JIS A 1470-1 “Testing method for moisture absorption and desorption of building materials-Part 1: Humidity response method” At 3 ° C.-75% RH), the moisture absorption after 15 hours is 15 g / m ² or more, the moisture absorption after 6 hours is 20 g / m ² or more, the moisture absorption after 12 hours is 29 g / m ² or more, and The present invention relates to a method for producing a decorative moisture-conditioning building material, wherein the moisture release amount after 12 hours in the moisture release process (23 ± 0.5 ° C.-50% RH) is 70% or more of the total moisture absorption amount .

Further, the method of manufacturing the decorative moisture control construction material of the present invention is characterized in setting kick the sealer layer between the substrate surface decorative layer.

The effect of the present invention is that the combination of silica gel and calcium silicate hydrate slurry in cementitious materials has high moisture absorption and desorption performance even when silica gel is used as a primary material, and is suitable as a building material. Thus, a humidity control building material having excellent dimensional stability and high strength and a method for producing the same are provided.
Further, the effect of the present invention is that the moisture-control building material is used as a base material, so that it has high moisture absorption / release performance and is suitable as a building material, which is lightweight, excellent in dimensional stability, and has high strength. It is in providing wet building materials.

It is a graph which shows the moisture absorption / release performance of this-article product 1.

(cement)
The cement used in the method for producing a humidity control building material of the present invention is not particularly limited, and examples thereof include ordinary Portland cement, early-strength cement, blast furnace cement, intermediate heat cement, low heat cement, eco cement, and the like. be able to. The specific surface area of the cement, 2500~5000cm ² / g, preferably it is preferably in the range of 3000~4000cm ² / g.

  The blending ratio of the cement is 20 to 60% by mass, preferably 30 to 50% by mass. When the blending ratio of the cement is less than 20% by mass, it is not preferable because sufficient strength and the like cannot be imparted to the humidity control building material, and when it exceeds 60% by mass, the silica gel may be deteriorated. It is not preferable.

(Calcium silicate hydrate slurry)
The calcium silicate hydrate slurry used in the method for producing a humidity-controlled building material of the present invention can be produced by mixing a calcareous raw material and a silicic acid raw material together with water and hydrothermal synthesis under high temperature and high pressure. Examples of the calcareous raw material include quick lime and slaked lime, and examples of the siliceous raw material include silica stone, diatomaceous earth, and silica fume. Silica stone is particularly preferable.

In addition, a calcium silicate hydrate slurry can be manufactured as follows, for example: A calcareous raw material and a siliceous raw material are mixed, for example, at a blending ratio (molar ratio of CaO / SiO ₂ ) of 0.5 to 1. 5, preferably 0.5 to 1.2, and 5 to 20 times, preferably 7 to 16 times, water is added to the mixture in a mass ratio, and the mixture is dispersed to obtain a raw material slurry. By performing hydrothermal synthesis in a stirrable pressure vessel at a temperature of 150 to 230 ° C., preferably 170 to 210 ° C. for 1 to 20 hours, preferably 3 to 12 hours, for example, as tobermorite, zonotlite, etc. A calcium acid hydrate slurry can be obtained.

  The average particle diameter of calcium silicate hydrate is in the range of 30 μm to 100 μm, preferably 50 μm to 90 μm. By using a calcium silicate hydrate slurry having such an average particle size, it is possible to impart sufficient strength as a humidity control building material while maintaining good drainage suitable for production by a papermaking method. . Here, the “average particle diameter” is determined by a particle size distribution measuring apparatus using a laser diffraction scattering method.

The compounding ratio of the calcium silicate hydrate slurry is 5 to 50% by mass, preferably 10 to 40% by mass in terms of solid content. When the blending ratio of the calcium silicate hydrate slurry is less than 5% by mass, the apparent density of the humidity control building material exceeds 1.2 g / cm ³ , and the bending strength is less than 10 N / mm ^2. It is not preferable, and if it exceeds 50% by mass, the apparent density of the humidity-control building material is less than 0.5 g / cm ³ or the bending strength is less than 10 N / mm ^2, which is not preferable.

(silica gel)
The silica gel used in the method for using the humidity-controlling building material of the present invention is B-type silica gel. Silica gel is an amorphous porous gel in which colloidal particles of silica are three-dimensionally bonded, and B-type silica gel has a coarse aggregation of colloidal particles, a large particle diameter, a small surface area, and a large pore volume. It is characterized by. Silica gel moisture adsorption includes surface adsorption and capillary condensation, and surface adsorption is the chemical adsorption of water by van der Waals forces and hydrogen bonds on the silica gel surface. Capillary condensation is a capillary phenomenon. Water is physically adsorbed to the pores. Silica gel B type has a characteristic of physically adsorbing a large amount of moisture at high humidity by capillary condensation and gradually releasing the adsorbed moisture when the humidity decreases. It is a material suitable for giving.

  The mixing ratio of the silica gel is in the range of 1 to 15% by mass, preferably 3 to 9% by mass. When the blending ratio of the silica gel is less than 1% by mass, it is not preferable because the blending effect of the silica gel is not expressed, and when it exceeds 15% by mass, the rate of change in length due to water absorption of the humidity control building material increases. It is not preferable because the dimensional stability is lowered and it is not suitable as an interior building material.

(Inorganic filler)
The inorganic filler used in the method for producing a humidity-control building material of the present invention is not particularly limited as long as it is generally used for an inorganic board, and examples thereof include mica and wollastonite. Examples include heat-resistant improving fillers, fire-resistant improving fillers such as dihydrate gypsum and calcium carbonate, fillers for preventing cracking such as silica stone, and porazone substances such as ferrosilicon dust and fly ash. More than one type can be used in combination. In addition, when dihydrate gypsum is used for the inorganic filler, care should be taken because it influences the hardening reaction of the cement when mixed with cement.

The blending ratio of the inorganic filler is 1 to 50% by mass, preferably 5 to 30% by mass. When the blending ratio of the inorganic filler is less than 1% by mass, it is not preferable because performances such as heat insulation and fire resistance required as interior building materials are deteriorated, and when it exceeds 50% by mass, the binder This is not preferable because the blending ratio of the cement is reduced and the bending strength is less than 10 N / mm ² .

(Reinforcing fiber)
Reinforcing fibers used in the method for producing a humidity control building material of the present invention include, for example, natural fibers such as wood pulp and various hemp, glass fibers, rock wool, ceramic wool, carbon fibers and other inorganic fibers, artificial pulp, polyvinyl Synthetic fibers such as alcohol, polypropylene, polyethylene, polyester, acrylic and rayon can be mentioned. Among these, cellulose fibers such as wood pulp are used as the main component of the reinforcing fiber from the viewpoint of further improving the bending strength and impact resistance.

  In addition, the freeness of the natural fiber is in the range of 150 to 450 ml, preferably 150 to 350 ml in terms of Canadian standard freeness (hereinafter referred to as “CSF”) defined in JIS P 8121. The CSF can be adjusted by beating a natural fiber, such as wood pulp, with a refiner or the like in a wet manner. By the beating treatment, fiber branching increases, so-called fibrillation is performed, and as a result, adhesion and flexibility with the matrix formed by hydration of the hydratable raw material for matrix formation are improved. Can do. Here, by setting the CSF to 450 ml or less, sufficient adhesion between the reinforcing fibers and the matrix can be achieved, and a good dispersion of the reinforcing fibers can be obtained, and a high strength can be imparted to the humidity control building material. In addition, by increasing the CSF to 150 ml or more, the drainage of the slurry is increased, dehydration unevenness, swelling, and peeling during pressure dehydration are prevented, and good flexibility and consequently impact resistance performance are imparted to the product. Can do.

  The fiber length of the inorganic fiber and the synthetic fiber is 6.0 to 0.2 mm, preferably 4.0 to 0.5 mm, and the fiber diameter is 20 to 50 μm, preferably 20 to 40 μm. Is within. Thus, by prescribing the sizes of the inorganic fibers and the synthetic fibers, there is an effect that sufficient strength can be obtained as a composite material while maintaining good drainage suitable for production by the papermaking method.

  The blending ratio of the reinforcing fibers is 3 to 12% by mass, preferably 3 to 9% by mass. When the blending ratio of the reinforcing fibers is less than 3% by mass, the matrix cannot be sufficiently reinforced, and a desired bending strength cannot be obtained. This is not preferable because the amount becomes excessive and the bonding strength of the raw material is extremely lowered and the desired bending strength cannot be obtained. In addition, as a reinforcing fiber, a natural fiber and an inorganic fiber and / or a synthetic fiber are used together, the natural fiber is 1 to 10% by mass, preferably 3 to 9% by mass, and the inorganic fiber and / or the synthetic fiber is 0.00%. The total amount of natural fibers, inorganic fibers and / or synthetic fibers is preferably within the above range, with 5 to 3% by mass, preferably 0.5 to 2% by mass.

  The method for producing a humidity control building material according to the present invention includes the above-mentioned various materials, and further wet mixing by adding 7 to 30 times (mass ratio), preferably 10 to 20 times, the solid content of the above various materials. Then, a slurry is formed, and a green plate is obtained by making the resulting slurry, and can be manufactured by curing and curing the obtained green plate after dehydrating under pressure.

  In the present invention, as the papermaking method, any papermaking method known to those skilled in the art can be applied, and examples thereof include a round net type papermaking method, a long net type papermaking method, and a flow-on type papermaking method. . In the round netting method, the raw slurry is made with a wire mesh cylinder to form a thin film (green film), the resulting thin film is transferred to an endless felt, dehydrated on the endless felt, and a predetermined thickness on a making roll. It is a method of winding up until it becomes, and when it becomes predetermined thickness, it will cut | disconnect from a making roll and will obtain a green board (green sheet). In addition, the flow-on type papermaking method supplies the raw slurry directly onto the endless felt, dehydrates it on the endless felt to form a thin film, winds it up to a predetermined thickness on a making roll, and reaches a predetermined thickness. Then, it is a method to obtain a raw board by separating from the making roll. Among these, the round net type papermaking method is preferable because the production efficiency is high, thin products can be produced, and the two-dimensional orientation of the reinforcing fibers is good, so that the reinforcing performance can be sufficiently exhibited. In the present invention, a sheet-like molded product before pressure dehydration obtained after paper making of a slurry is defined as “green plate”.

  Here, in the manufacturing method of the humidity control building material of the present invention, in the paper making process, the moisture content of the thin film when wound on the making roll is 80 to 160%, preferably 90 to 140%. When the moisture content of the thin film is less than 80%, it is not preferable because it is not possible to provide a void suitable for imparting moisture absorption / release performance to the humidity control building material. This is not preferable because impact resistance cannot be sufficiently imparted.

Moreover, the pressure plate can be dehydrated using a pressure dehydration apparatus such as a known press machine. The pressing pressure (holding pressure) of the green plate is ^{2 to} 30 N / mm ² , preferably 5 to 20 N / mm ² . When the press pressure is less than ² N / mm ² , it is not preferable because the material cannot be appropriately densified and desired bending strength and moisture absorption / release performance cannot be obtained, and more than 30 N / mm ² Since the material is excessively compressed, it is not preferable because it causes defects in the material such as water cracking and delamination.

  Moreover, in the manufacturing method of the humidity-control building material of this invention, a curing | hardening hardening process is not specifically limited, For example, well-known methods, such as natural curing and wet curing, are employable.

The humidity control building material obtained by the method for manufacturing the humidity control building material of the present invention as described above is a medium humidity region in accordance with JIS A 1470-1 “Moisture absorption / release test method of building material—Part 1: Humidity response method”. In the moisture absorption and desorption performance test at 15 ° C., the moisture absorption after 3 hours in the moisture absorption process (23 ± 0.5 ° C.-75% RH) is 15 g / m ² or more, and the moisture absorption after 6 hours is 20 g / m ² or more. The moisture absorption after 12 hours is 29 g / m ² or more and the moisture release after 12 hours in the moisture release process (23 ± 0.5 ° C.-50% RH) is 70% or more of the total moisture absorption. Preferably there is. Here, it is not preferable that the moisture absorption amount is less than the above range, or that the moisture release amount is less than 70% of the total moisture absorption amount because the moisture conditioning building material does not have sufficient moisture conditioning performance.

Moreover, it is preferable that the humidity-control building material of this invention exists in the range whose bending strength is 10-30 N / mm < ² >, Preferably it is 12-30 N / mm < ² >. When the bending strength is less than 10 N / mm ^2, it is not preferable because the strength of the humidity control building material is insufficient, and when it exceeds 30 N / mm ² , the humidity control building material itself becomes hard and the impact resistance performance is lost. In addition, it is not preferable because the burden during processing and construction increases and there is a risk that versatility may be impaired. Here, the bending strength is measured based on the description of JIS A 1408.

Incidentally, the apparent density of the moisture control construction material of the present invention, 0.5 to 1.2 g / cm ^3, it is preferable that preferably is in the range of 0.6~1.0g / cm ^3. If the apparent density is less than 0.5 g / cm ³ , the physical properties as building materials such as flexibility and body impact performance may not be imparted to the humidity-controlled building materials. When it exceeds 2 g / cm ³ , when the humidity control building material of the present invention is used for a normal interior, the material itself becomes heavy and difficult to construct, which is not preferable. Here, the apparent density is obtained by drying the humidity-controlled building material to an absolutely dry state (a state dried to a constant weight at 105 ° C.) and dividing the mass (g) after drying by the volume (cm ³ ). be able to.

  Moreover, it is preferable that the humidity control building material of the present invention has a length change rate of 0.20% or less, preferably 0.18%. The length change rate means that the smaller the value, the better the dimensional stability. When the rate of change in length exceeds 0.20%, when interior construction is performed, the movement of the material accompanying moisture absorption and release becomes large, which is not preferable because it causes joint opening and cracking. Here, the rate of change in length is measured according to JIS A 5430.

  Next, the makeup / humidity control building material of the present invention has a configuration in which the humidity control building material of the present invention is used as a base material and a decorative layer is provided on the surface of the base material. Examples of the material constituting the decorative layer include a moisture-permeable paint, a plaster paint, a general paint, a moisture-permeable decorative paper, and a moisture-permeable decorative veneer (film). Among these, in consideration of the workability and humidity control performance of the resulting cosmetic and humidity control building materials, moisture permeable paints, plaster paints, general paints, etc. can be used, and moisture permeable paints, plaster paints, etc. can be used. preferable.

  Here, the moisture-permeable coating is a coating composition containing an alkoxysilane and a synthetic resin dispersion and having a moisture passage inside the coating after drying. As the moisture-permeable coating material, for example, a ceramic-modified silicone-based coating material (Nippe DAN Silicon Cera: manufactured by Nippon Paint Co., Ltd.) can be used.

  Moreover, as a plaster coating material, what contains the plaster material based on slaked lime and a synthetic resin component, and is widely used now for the exterior wall with a texture can be used. Since the plaster paint contains a lot of inorganic particles and a lot of moisture passages are formed, it does not impair the moisture absorption / release performance of the base material made of the humidity control building material. As such a plaster paint, for example, slaked lime / synthetic resin paint (India Art Cera: manufactured by Nippon Paint Co., Ltd.) can be used.

  Furthermore, as a general paint, a paint composed of a resin component such as an acrylic resin can be used. However, when such a general paint is applied in an excessive amount, the substrate surface is sealed, and the moisture absorption / release performance of the substrate may be significantly impaired. Therefore, when a general paint is used, it is preferable to decorate with a coating amount as small as possible by using a printing method such as a screen printing method or a gravure offset printing method.

  Moreover, the sealant layer can also be provided between the above-mentioned base material and the decorative layer in the decorative and humidity-controlled building material of the present invention. By using a breathable sealer as the sealer, the adhesion of the decorative layer can be improved without impairing the moisture permeability of the substrate. As such a sealer, for example, a moisture permeable sealer, a sodium silicate inorganic sealer, a hybrid sealer based on an inorganic component, and containing an organic resin can be used.

Here, as the moisture permeable sealer, silica-modified acrylic copolymer resin, acrylic resin emulsion or the like can be used, for example, Nippe Ultra Sealer III (manufactured by Nippon Paint Co., Ltd.) or the like.
Moreover, the sodium silicate type inorganic sealer is an inorganic sealer for the purpose of reinforcing the surface of a base material containing sodium silicate as a main component. Furthermore, the hybrid sealer is formed by blending a small amount of an acrylic resin component with sodium silicate. Sodium silicate-based inorganic sealers and hybrid sealers are compatible with the constituents of the substrate surface layer when the main component sodium silicate is dried and cured, leaving the substrate voids and pores in shape. There is an advantage that the material surface can be strengthened. However, if the coating amount is excessive, the voids and pores are blocked, and if the coating amount is too small, the surface of the substrate cannot be sufficiently strengthened. For example, the coating amount is 10 g / m ^2. It is preferably 100 g / m ² or less, preferably 10 g / m ² or more and 50 g / m ² or less. In addition, a sodium silicate type | system | group inorganic sealer and a hybrid sealer can be preferably used as a sealer in the case of using a general paint.

  As a method for applying the moisture-permeable paint, the plaster paint, and the sealer to the base material, a method that can adjust the coating amount of the paint to a small amount is preferable. For example, a spray method, a roll coater method, or the like is preferably used.

For general paints, screen printing methods and gravure offset printing methods can be used, which can be the minimum amount necessary to decorate the coating amount, and decoration with a smaller amount of coating is possible. It is particularly preferable to use a gravure offset printing method. In the gravure offset printing method, ink (general paint) is placed on the etched part of a metal substrate that has been designed, then the ink is transferred to an offset roll, and further decorated by transferring it to a substrate. The ink can be uniformly and finely arranged with a very small amount of coating. In addition, when apply | coating a general coating material by the screen printing method or the gravure offset printing method, the application amount is 1-20 g / m < ² >, Preferably it exists in the range of 3-10 g / m < ² >. If the coating amount is less than 1 g / m ² , it is not preferable because it cannot be decorated to obtain a decorative layer that gives off design, and if it exceeds 20 g / m ² , the resulting cosmetic humidity control Since it may affect the moisture absorption and desorption performance of building materials, it is not preferable.

The makeup / humidity-controlled building material having the above-described configuration is capable of producing design while maintaining the good moisture absorption / release performance of the humidity-controlled building material of the present invention as a base material. JIS A 1470- 1 In the moisture absorption and desorption performance test in the mid-humidity range according to “Testing method for moisture absorption and desorption of building materials-Part 1: Humidity response method”, 3 in the moisture absorption process (23 ± 0.5 ° C.-75% RH) The moisture absorption after 15 hours is 15 g / m ² or more, the moisture absorption after 6 hours is 20 g / m ² or more, the moisture absorption after 12 hours is 29 g / m ² or more, and the moisture release process (23 ± 0.5 The moisture release amount after 12 hours at (° C.-50% RH) is 70% or more of the total moisture absorption amount. [Moisture release (%) = (23 ± 0.5 ° C.−50% RH after 12 hours moisture release (g / m ² )) / (23 ± 0.5 ° C.−75% RH after 12 hours moisture absorption ( g / m ² )) × 100]

Hereinafter, the humidity control building material of the present invention will be further described with reference to examples.
Material cement used: Taiheiyo Cement Co., Ltd., ordinary Portland cement with a specific surface area of 3500 cm ² / g;
Calcium silicate hydrate slurry: type tobermorite, average particle size 65 μm, solid content concentration 10% by mass;
B-type silica gel: manufactured by Keiwa Furnace Co., Ltd., B-type silica gel powder (-0.8 mm product);
Wood pulp: NBKP (beating treatment to about CSF 300 ml);
Vinylon: manufactured by Kuraray Co., Ltd., 2.0 dtex 4 mm;
Zeolite: Nitto Zeolite Co., Ltd., mordenite natural zeolite;
Diatomaceous earth: Showa Chemical Industry Co., Ltd.
Perlite: Mitsui Metal Mining Co., Ltd.
Slag: Made by Day Shii, Seramento;
Mica: manufactured by Kansai Matec Co., Ltd., 100 mesh;
Sepiolite: IGS manufactured by Sakai Kogyo Co., Ltd.

  Various raw materials are blended at the blending ratios described in Table 1 below, and water is added thereto and wet-mixed to form a slurry having a solid content concentration of 10% by mass. A green sheet having a predetermined thickness was obtained by papermaking. The obtained green plate was subjected to pressure dehydration with a press machine at a predetermined pressure, and then cured and cured at a temperature of 60 ° C. for 15 hours to obtain a product of the present invention and a comparative product. Table 1 shows the characteristics of the product of the present invention and the comparative product.

In the table,
“Apparent density” is obtained by drying a specimen to an absolutely dry state (a state dried at 105 ° C. until reaching a constant weight) according to JIS A 5430, and dividing the mass (g) after drying by the volume (cm ³ ). Is the value obtained by
“Bending strength” is measured in accordance with JIS A 1408;
“Length change rate” is measured in accordance with JIS A 5430;
“Humidity control performance” is a medium humidity range [23 ± 0.5 ° C.-75% RH (moisture absorption process) in accordance with JIS A 1470-1 “Moisture absorption / release test method for building materials-Part 1: Humidity response method”] , 23 ± 0.5 ° C.-50% RH (moisture release process)]. Before the test, the specimen was cured at 23 ° C. ± 0.5 ° C.−50 ± 2% RH until it became a constant weight.

  In addition, in FIG. 1, the moisture absorption / release performance of the product 1 of the present invention is shown.

The present invention products 1 to 4 are cement, calcium silicate hydrate slurry, and B-type silica gel blended in a well-balanced manner, and of course, not only the physical properties of the building material but also excellent moisture absorption and desorption performance. Was building material;
In Comparative Product 1, the amount of cement exceeds the range of the present invention, the amount of calcium silicate hydrate slurry is less than the range of the present invention, and the apparent density is 0.91 g / cm ³ , It was not suitable as a building material because sufficient strength could not be obtained;
Comparative product 2 has a cement content below the range of the present invention, so that sufficient strength could not be obtained and was unsuitable as a building material;
In Comparative Example 3, the amount of calcium silicate hydrate slurry exceeds the range of the present invention, and even if pressure dehydration molding is performed at a high press pressure, the target product thickness is not reached. Partial cracking occurred. Although the apparent density is as low as 0.57 g / cm ^3, it has high strength, but the length change rate is as large as 0.32%, which is not suitable as a building material;
In Comparative Product 4, the amount of calcium silicate hydrate slurry was less than the range of the present invention, sufficient strength was not obtained, and moisture absorption / release performance was also deteriorated;
In Comparative Product 5, the blending amount of B-type silica gel exceeds the range of the present invention, and a certain level of strength can be secured, but the rate of change in length due to moisture absorption and desorption of B-type silica gel increases, and as a building material Was unsuitable;
Comparative product 6 is a compound containing zeolite as a humidity control substance, but sufficient moisture absorption / release performance could not be obtained, and was insufficient as a humidity control building material;
Comparative product 7 was prepared by blending diatomaceous earth as a humidity-controlling substance, but was unable to obtain sufficient moisture absorption / release performance and was insufficient as a humidity-controlling building material;
Comparative product 8 is a blending example based on the example of Patent Document 2, but could not obtain sufficient strength and moisture absorption / release performance, and was insufficient as a humidity control building material;
Comparative product 9 was obtained by replacing the zeolite of comparative product 8 with B-type silica gel, but the physical properties as a building material were not obtained, which was inappropriate.

Make-up humidity building material A
The humidity control building material of the present invention product 4 was used as a base material, and the base material was heated to about 60 ° C. by heating the base material with a heating device. Next, a ceramic modified silicon-based paint [Nippe DAN Silicon Sera (manufactured by Nippon Paint Co., Ltd.)] as a moisture-permeable paint is applied to the surface of the substrate with a roll coater at a coating amount of 53 g / m ² , and then hot-air drying is performed. Thus, a makeup / humidity building material A provided with a decorative layer having design properties was obtained.

When the humidity control performance of the surface having the decorative layer of the decorative moisture-conditioning building material A obtained as described above was measured in the same manner as described above, the moisture absorption at 23 ° C.-75% RH was 18 g / m ² after 3 hours. After 6 hours, 27 g / m ² , After 12 hours 40 g / m ² , and the moisture release amount was 80%.

Make-up and humidity building material B
The humidity control building material of the present invention product 4 was used as a base material, and the base material was heated to about 60 ° C. by heating the base material with a heating device. Next, after applying Ultra Sealer III (manufactured by Nippon Paint Co., Ltd.) as a sealer on the substrate surface with a roll coater at a coating amount of 32 g / m ² , the sealer is dried in a drying zone, and then ceramic modification A cosmetic coating comprising a decorative layer having a design property by applying a silicon paint [DAN silicon sera (manufactured by Nippon Paint Co., Ltd.)] with a roll coater at an application amount of 41 g / m ² and then drying with hot air. Wet building material B was obtained.

When the humidity control performance on the surface having the decorative layer of the decorative moisture-conditioning building material B obtained as described above was measured in the same manner as described above, the moisture absorption at 23 ° C.-75% RH was 17 g / m ² after 3 hours. And 25 g / m ² after 6 hours, 39 g / m ² after 12 hours, and the moisture release amount was 79%.

Make-up and humidity building material C
The humidity control building material of the present invention product 4 was used as a base material, and the base material was heated to about 60 ° C. by heating the base material with a heating device. Next, after applying ceramic / silicone design paint [Indyart Cera (manufactured by Nippon Paint Co., Ltd.)] as a plaster paint on the surface of the base material with a roll coater at a coating amount of 325 g / m ² , applying hot air drying Thus, a makeup / humidity building material C provided with a decorative layer having design properties was obtained.

When the humidity control performance on the surface having the decorative layer of the decorative moisture-conditioning building material C obtained as described above was measured in the same manner as described above, the moisture absorption at 23 ° C.-75% RH was 18 g / m ² after 3 hours. After 6 hours, 28 g / m ² , After 12 hours 43 g / m ² , and the moisture release amount was 81%.

Make-up and humidity building material D
The humidity control building material of the present invention product 4 was used as a base material, and the base material was heated to about 60 ° C. by heating the base material with a heating device. Next, after applying Ultra Sealer III (manufactured by Nippon Paint Co., Ltd.) as a sealer on the substrate surface with a roll coater at a coating amount of 30 g / m ² , the sealer is dried in a drying zone, and then as a plaster paint A ceramic / silicone design paint [Indyart Cera (manufactured by Nippon Paint Co., Ltd.)] was applied with a roll coater at a coating amount of 276 g / m ² , followed by hot air drying to provide a decorative layer having design properties A makeup / humidity building material D was obtained.

When the humidity control performance on the surface having the decorative layer of the decorative moisture-conditioning building material D obtained as described above was measured in the same manner as described above, the moisture absorption at 23 ° C.-75% RH was 17 g / m ² after 3 hours. 6 hours later, 26 g / m ² , 12 hours later 41 g / m ² , and moisture release amount 82%.

Make-up and humidity building material E
The humidity control building material of the present invention product 4 was used as a base material, and the base material was heated to about 60 ° C. by heating the base material with a heating device. Next, a sodium silicate-based inorganic sealer (manufactured by Tope Corp.) was applied to the substrate surface with a roll coater at an application amount of 50 g / m ² , and then the sealer was dried in a drying zone. Next, after applying an acrylic paint (made by Tope Co., Ltd.) at a coating amount of 10 g / m ² with a gravure offset printing machine, hot air drying is performed, thereby providing a makeup layer having a decorative layer having design properties. Humidity conditioning building material E was obtained.

When the humidity control performance on the surface having the decorative layer of the decorative moisture-conditioning building material E obtained as described above was measured in the same manner as described above, the moisture absorption at 23 ° C.-75% RH was 17 g / m ² after 3 hours. After 6 hours, 23 g / m ² , after 12 hours 38 g / m ² , and the moisture release amount was 80%.

Claims (3)

  Cement 20-60 mass%, calcium silicate hydrate slurry obtained by hydrothermal synthesis of calcareous raw material and siliceous raw material in advance 5 to 50 mass% in terms of solid content, silica gel 1-15 mass%, inorganic filler A mixture containing 1 to 50% by mass and 3 to 12% by mass of reinforcing fibers is wet-mixed to obtain a slurry, and the resulting slurry is made to obtain a green plate, and the obtained green plate is added. A method for producing a humidity-control building material, wherein the moisture content of the thin film is 80 to 160% when the thin film is wound around a making roll in the paper making process, and the pressure dehydration process. The manufacturing method of the humidity-control building material characterized by making the press pressure in 2-30 Mpa. A humidity control building material obtained by the method of manufacturing a humidity control building material according to claim 1, wherein the humidity range is based on JIS A 1470-1 “Testing method for moisture absorption and desorption of building materials—Part 1: Humidity response method” In the moisture absorption and desorption performance test at 15 ° C., the moisture absorption after 3 hours in the moisture absorption process (23 ± 0.5 ° C.-75% RH) is 15 g / m ² or more, and the moisture absorption after 6 hours is 20 g / m ² or more. The moisture absorption after 12 hours is 29 g / m ² or more and the moisture release after 12 hours in the moisture release process (23 ± 0.5 ° C.-50% RH) is 70% or more of the total moisture absorption. Yes, the bending strength is in the range of 10-30 N / mm ² , the apparent density is in the range of 0.5-1.2 g / cm ³ , and the length change rate is 0.20% or less. the range near Ru moisture control construction material as a base material, a process for the preparation of a cosmetic moisture control construction material consisting of providing a decorative layer on the substrate surface, resulting In the moisture absorption and desorption performance test in the middle humidity region in accordance with JIS A 1470-1 “Testing method for moisture absorption and desorption of building materials—Part 1: Humidity response method”, the moisture-absorbing process (23 ± 0 The moisture absorption after 3 hours at 5 ° C.-75% RH) is 15 g / m ² or more, the moisture absorption after 6 hours is 20 g / m ² or more, and the moisture absorption after 12 hours is 29 g / m ² or more. And the moisture release amount after 12 hours in the moisture release process (23 ± 0.5 ° C.-50% RH) is 70% or more of the total moisture absorption amount . Keru set the sealer layer between the substrate surface decorative layer, the manufacturing method of the decorative moisture control construction material according to claim 2, wherein.

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