JP3653523B2 - Carbonated cured body - Google Patents

Description

  The present invention relates to a carbonated cured body, and more particularly, to a carbonated cured body formed by a carbonation treatment suitably used as a moisture absorbing / releasing material such as a building member.

  In recent years, with the increase in airtightness and heat insulation of residential structures, moisture, volatile chemical substances, bad odors and the like are easily trapped in the room, causing various problems. For example, as a problem due to moisture, there is a problem that a large amount of dew condensation occurs on walls and windows during winter and causes mold. On the other hand, odor problems such as sick house syndrome, pet odor, and aging odor have become serious as problems of volatile chemicals and odor.

  In order to make the indoor environment comfortable, a moisture absorbing / releasing material having an action of absorbing moisture when the indoor atmosphere is in a high humidity state and releasing moisture when the indoor atmosphere is in a dry state has been studied. In addition, interior materials having a function of adsorbing volatile chemical substances such as formaldehyde and malodors are also being studied. If such a moisture absorbing / releasing material or an interior material provided with an adsorption function is used as, for example, a wall material, a ceiling material, or a partition material as a building member, a more comfortable indoor environment can be obtained.

  As a technique for obtaining such moisture absorption / release properties, for example, in Patent Document 1, allophane or imogolite, which is a porous material such as volcanic pumice stones, is mixed, molded, and condensed. There are proposed humidity-controlling building materials, and humidity-controlling building materials obtained by mixing, molding, and firing allophane or imogolite alone or with other ceramic raw materials.

  However, in the method of putting a porous material as described above and solidifying with a setting hardener such as gypsum, there is a problem that the strength as a member is likely to be insufficient, and in the method of baking with a porous material, There has been a problem that sufficient moisture absorption and desorption properties may not be obtained due to alteration of the porous material due to heat and the inclusion of the porous material in the base material. In addition, the same problems as described above have occurred with respect to the adsorptivity and decomposability of volatile chemical substances and odors.

  On the other hand, in Patent Document 2, a humidity control material comprising a composition in which chitosan is blended with diatomaceous earth and a composition in which chitosan is blended with diatomaceous earth are coated on a substrate or an object. Wet materials have been proposed.

  However, in the above composition as well, in the method of baking or the method of solidifying with a setting curing agent, as in the case of Patent Document 1, there are problems such as alteration of the porous material, insufficient moisture absorption and desorption, and insufficient strength. In addition, when the composition is applied to a substrate or an object, there is a problem that the coating process takes time and labor. Further, there is an economic problem that binders such as chitosan are generally expensive.

Japanese Patent No. 3041348 JP 2002-20654 A

  An object of the present invention is to provide a sufficient strength while retaining a large amount of porous material in view of the problems of the conventional hygroscopic materials described above, and is excellent in hygroscopic or volatile chemical substances and offensive odors. An object of the present invention is to provide a carbonated cured body having adsorptivity and decomposability.

The carbonated cured product according to claim 1 is composed of calcium carbonate, amorphous silica, and attapulgite or sepiolite, and the amorphous silica content is 6 to 40% by weight .

The carbonized cured body according to claim 2 is composed of calcium carbonate, amorphous silica, and hydrous magnesium silicate mineral obtained by firing attapulgite or sepiolite at 150 to 800 ° C., and the content of amorphous silica is It is characterized by being 6 to 40% by weight.

Carbonation cured product according to claim 3, there is provided a carbonated hardened body according to claim 1 or 2, the weight ratio of calcium carbonate and amorphous silica (weight / weight amorphous silica calcium carbonate) Is 1-2.

The carbonized cured body according to claim 4 is the carbonized cured body according to any one of claims 1 to 3 , wherein the carbonized cured body contains 2 to 15 wt% of pulp fibers.

The carbonated cured body according to claim 5 is the carbonated cured body according to any one of claims 1 to 4 , wherein the carbonized cured body further includes at least one selected from an adsorbent and a decomposition agent. Is included.

The carbonated cured body according to claim 6 is the carbonated cured body according to any one of claims 1 to 5 , wherein the alkylated polyorganosiloxane further contains 0.1 to 0.1 in the carbonated cured body. It is characterized by containing 10% by weight.

Hereinafter, the present invention will be described in detail.
In the carbonated cured product of the present invention, the content of amorphous silica is 6% by weight or more based on the total weight of the carbonated cured product. If the content is too small, the strength of the carbonated cured product tends to be small, such being undesirable. The upper limit of the content is not particularly recognized, but when a porous material not containing amorphous silica such as attapulgite or sepiolite is used in the carbonized cured body, it is 40% by weight or less in terms of strength retention. It is preferable that
The porous material is made of a material that does not dissolve crystalline silica but does not dissolve by alkali treatment with an alkali that dissolves amorphous silica, that is, an alkali treatment described later.

  In the present invention, calcium carbonate and amorphous silica include those produced by carbonation treatment of calcium silicate and those added as a filler or the like. For this reason, in the content of the amorphous silica, when the content of the amorphous silica produced by the carbonation treatment can be analyzed, the content of the produced amorphous silica is 6% by weight or more. It is preferable that In order to make the content of amorphous silica 6% by weight or more, it is effective to mix calcium silicate and porous material in the inorganic material by 10 to 80% by weight of porous material and 20 to 90% by weight of calcium silicate. In addition, the amount of amorphous silica can be controlled.

  Moreover, when the porous material which does not contain amorphous silica like attapulgite or sepiolite is used, it is preferable that the said content shall be 6 to 40 weight%.

  The method for analyzing and calculating the content of the amorphous silica is not particularly limited. For example, a method of calculating from the dissolved component using an alkaline aqueous solution may be employed.

  Calcium carbonate and amorphous silica produced during the carbonation treatment are produced by carbonating a calcium silicate compound.

  Examples of the calcium silicate compound include calcium silicate hydrates such as cement hydrate and tobermorite, and calcium silicate anhydrides such as cement and wollastonite (wollastonite). Among these, it is preferable to use calcium silicate anhydrate (hereinafter simply referred to as “calcium silicate”) from the viewpoint of strength development of the carbonated cured product. From the viewpoint of reaction rate and chemical stability of the cured product properties, it is preferable to use calcium silicate anhydride. It is more preferable to use lastite.

The wollastonite is a silicate mineral consisting of calcium silicate represented by CaSi0 _3, it is naturally occurring as a white fibrous or lumps. In general, the fibrous shape is used as a reinforcing member for asbestos substitution.

  The wollastonite is preferably wollastonite that has been pulverized to increase the specific surface area, and the particle size is preferably 10 μm or less in terms of average particle size. When the average particle size is larger than 10 μm, the carbonation reaction may not easily proceed to the inside of the particles.

  Further, in the volume distribution of the powder particle size of the wollastonite, those having a cumulative 10% diameter of 1 μm or less are preferable. The volume distribution of the powder particle size is a value representing the particle size distribution of the powder by the volume of the particles, and the cumulative 10% diameter is a particle corresponding to 10% of the total particle volume from the smallest particle diameter. Is the diameter. When the cumulative 10% diameter exceeds 1 μm, the reactivity in the carbonation treatment decreases, and a long time or a high pressure may be required to form a carbonated cured body.

When using the wollastonite other than the wollastonite whose specific surface area is increased by the fine pulverization treatment, an aspect ratio of 5 to 25 is preferable, and an aspect ratio of 10 to 23 is more preferable. preferable.
If the aspect ratio is less than 5, the wollastonite orientation does not occur efficiently in the shaping step before the carbonation treatment, the densification of the shaped body is insufficient, and the mechanical strength after carbonation hardening is small. When the aspect ratio exceeds 25, the entanglement between the wollastonite fibers is large, the bulk density is increased, and high-pressure and long-time press molding is required for shaping.
The wollastonite having the above aspect ratio is not particularly limited, and can be obtained, for example, by pulverization and classification with a jet mill or the like.
By blending such wollastonite, the specific strength can be effectively maintained while satisfying the nitrogen adsorption specific surface area value and the material change rate.

  Moreover, it is preferable that the said wollastonite is activated by performing the process which gives a high energy. By activating, the chain silicate structure of wollastonite can be changed, and the reactivity of wollastonite can be increased.

  The activation is obtained, for example, by giving mechanical energy to the wollastonite powder using a grinding medium or the like. The mechanical energy is not particularly limited, and examples thereof include energy due to compression force, shear force, impact force, friction force, and the like.

  The mechanical energy is preferably 0.01 to 30 kWh / kg. When the amount is less than 0.01 kWh / kg, the structural change of the obtained powder is reduced, and the carbonation activity, that is, the ease of carbonization of the powder is reduced. If it exceeds 30 kWh / kg, the load on the pulverizer increases, contamination as a pulverizing medium, for example, due to severe wear of balls and pulverizing containers, coarse particles due to aggregation of the processed powder, cost Problems such as disadvantages in productivity are likely to occur. More preferably, it is 0.1-5 kWh / kg.

The method for applying the mechanical energy is not particularly limited, and for example, it can be performed using a pulverizer generally used for pulverization. The pulverizing apparatus is not particularly limited, and examples thereof include a ball medium mill in which impact, compression, and shear are combined, such as a ball mill, a vibration mill, a planetary mill, and a medium stirring mill, and a jet pulverizing apparatus. Among these, a ball-medium type mill is preferable in that the mechanical energy can be effectively applied to the wollastonite powder mechanically.
By blending such wollastonite, the specific strength can be effectively maintained while satisfying the nitrogen adsorption specific surface area value and the material change rate.

In addition to the above, the carbonized cured body of the present invention has a nitrogen adsorption specific surface area determined by the following formula (1) of 25 to 300 m ² / g.
(Nitrogen adsorption specific surface area after alkali treatment) x (sample weight after alkali treatment) / (sample weight before alkali treatment) Formula (1)

Here, the alkali treatment refers to a treatment in which an alkali-soluble component such as amorphous silica contained in a sample is dissolved and removed in an alkaline solution.
Therefore, the sample weight after alkali treatment refers to the sample weight after alkali treatment of the carbonated cured body. For example, an alkaline solution is added to a sample obtained by pulverizing the carbonated cured body to dissolve soluble components. Thereafter, the remaining solid matter is taken out, and the dry weight of the washed and dried sample can be measured.

  Further, the nitrogen adsorption specific surface area after alkali treatment refers to the nitrogen adsorption specific surface area of the sample after the carbonized cured body is subjected to alkali treatment. For example, an alkaline solution may be added to a sample obtained by pulverizing the carbonated cured body. This can be determined by measuring the nitrogen adsorption specific surface area of the sample that has been taken out after the dissolved components are dissolved, taken out, washed and dried.

  The alkaline solution used for the alkali treatment is not particularly limited, but a solution that dissolves amorphous silica without dissolving crystalline silica is used. For example, a 2N sodium hydroxide aqueous solution is preferably used. .

The nitrogen adsorption specific surface area represented by the above formula (1) means the effective specific surface area of the portion excluding the alkali-soluble component contained in the carbonated cured body based on the weight before alkali treatment. When the adsorption specific surface area is less than 25 m ² / g, it means that the effective specific surface area in the component having chemical stability with respect to the alkaline solution or the like contained in the carbonated cured body is small, and the moisture absorption and desorption performance is Insufficient durability and moisture absorption / release performance may be insufficient.
Moreover, when the said nitrogen adsorption specific surface area exceeds 300 m < ² > / g, it will become so-called porous (porous) too much, and the effect of the intensity | strength improvement of the obtained carbonation hardening body may become low.
In order to apply to moisture-absorbing / releasing building materials and obtain a sufficient dew condensation reducing effect in a small area construction, the nitrogen adsorption specific surface area is preferably in the range of 45 to 300 m ² / g.
In order to make the nitrogen adsorption specific surface area within the above range, the amorphous silica is effectively made by blending the calcium silicate and the porous material in the inorganic material to 10 to 80% by weight of the porous material and 20 to 90% by weight of the calcium silicate. The amount of can be controlled.

In the present invention, the specific strength of the carbonated cured body is 200 m or more, more preferably 300 m or more. Here, the specific strength is a value represented by a ratio (bending strength / bulk density) between the bending strength (kg / m ² ) and the bulk density (kg / m ³ ) of the carbonized cured body. When the specific strength is less than 200 m, the practical strength as a plate material tends to be insufficient, and when attempting to ensure the practical strength, the material is thick and tends to be a heavy member.

  In the present invention, the carbonized cured body refers to a shaped body made of a mixture of an inorganic material containing calcium silicate such as wollastonite and water with carbon dioxide, and the inorganic material component such as calcium silicate reacts with carbon dioxide. It means a cured product obtained by doing.

  The method for obtaining the mixture is not particularly limited, and a mixer generally used for mixing cement or the like can be used. Examples thereof include an omni mixer, an Eirich mixer, a Henschel mixer, and the like. Further, as a method for obtaining a shaped body from the above mixture, a method used for production of general ceramic building materials can be used, for example, a dry press method, a papermaking method, a dehydration press method, a flow-on method, an extrusion method and the like. It is done.

  In the case of shaping by a dry press molding method, the ratio of the amount of added water to the total amount of raw material solids is preferably 1.7 to 20% by weight. If the amount is less than this range, the amount of carbon dioxide dissolved between the particles during carbonation treatment is small and the reaction rate is low, so that sufficient densification of the structure cannot be expected. Moreover, if it exceeds this range, handling may be hindered.

  Moreover, when shaping by wet methods, such as a papermaking method and a dehydration press method, the amount of water added with respect to the total amount of raw material solids is preferably 200 to 400% by weight. If the amount is less than this range, the dispersibility of the mixture may be poor and non-uniform, or the pattern transfer to the surface may be reduced. If it exceeds this range, the time for squeezing excess water during shaping may become longer.

  Moreover, it is preferable that the moisture content of the shaped body after dehydrating the said mixture by the papermaking method or the dehydration press method is 10 to 50 weight%. When the water content is less than 10% by weight, the carbonation reaction during carbonation may be insufficient. When the water content exceeds 50% by weight, handling may be hindered or The reaction may be insufficient, and the performance required as a cured product may not be satisfied.

The papermaking method is not particularly limited with respect to the method, and a known method such as a round net type or a long net type can be suitably applied. For example, the papermaking method is supplied on a water-permeable sheet on a paper machine conveyor. The above-mentioned slurry-like mixture is sandwiched at a desired thickness by a roll while excess water is being squeezed, dehydrated and cut to a predetermined length, and further dehydrated with a press or the like to obtain a moisture content. A method of shaping so as to be 10 to 50% by weight is suitable.

  In the present invention, besides the above materials, depending on the purpose and molding method, silica sand, fly ash, calcium carbonate, gypsum, blast furnace slag, silica fume, attapulgite, sepiolite, talc, mica and other inorganic fillers, pearlite, Lightweight aggregates such as fly ash balloons, glass balloons, silica flowers, styrene beads, natural fibers such as wood chips and pulp, synthetic resin fibers such as vinylon, polypyropylene, polyvinyl chloride, polyester and polyamide, carbon fibers, etc. are added. Also good.

  In particular, when pulp fibers are contained in the carbonated hardened body in an amount of 2 to 15% by weight, cutting workability, end shape workability, and nailing (construction) are improved when the obtained hardened body is used for building materials. Is effective. If the blending ratio is too small, the impact resistance will be insufficient, and cracking and chipping may occur easily. If it is too large, the fibers will be exposed from the processed end face during cutting, and the appearance Not preferable.

  In addition, chemical substances, malodorous adsorbents and decomposition agents described later may be added. For example, activated carbon, bamboo charcoal, inorganic porous material, scallop shellfish, peroxide and other oxidizing agents, hydrazide compounds, azole compounds, azine compounds , Etc.

  Examples of the method for obtaining the carbonated cured body include a method in which carbon dioxide in a gas state or a supercritical state is brought into contact. In this case, an arbitrary concentration may be used as the carbon dioxide gas concentration, but treatment at a concentration close to 100% is preferable in terms of carbonation efficiency.

  Although it does not specifically limit as temperature of a carbonation process, From the viewpoint of reaction amount and industrial productivity, the range of room temperature-200 degreeC is preferable, and 40 degreeC-120 degreeC is more preferable. If the treatment temperature is too low, the carbonation reaction amount decreases, so the strength of the carbonated cured product tends to decrease.If the treatment temperature is too high, the carbonation reaction amount increases, but there is a large amount of energy. Since it is necessary, it is not preferable from the viewpoint of industrial productivity.

  Although it does not specifically limit as a pressure of a carbonation process, From a viewpoint of reaction amount and industrial productivity, it is preferable to exist in the range of 0.2MPa-20MPa, More preferably, it is 0.5-1MPa. That is, when it is lower than 0.2 MPa, the carbonation reaction amount tends to decrease and the strength tends to decrease, and when it is higher than 20 MPa, the carbonation reaction amount hardly changes and industrial energy is required because large energy is required. From the viewpoint of

  The carbonation time is not particularly limited, but is preferably within the range of 5 to 120 minutes from the viewpoint of the reaction amount and industrial productivity. That is, when the treatment time is less than 5 minutes, the carbonation reaction amount tends to decrease and the strength tends to decrease. When the treatment time exceeds 120 minutes, the carbonation reaction amount hardly changes, but it is efficient from the viewpoint of productivity. Not.

The carbonated cured product of the present invention comprises calcium carbonate and amorphous silica, and is obtained by the following formula (2) under the condition that the content of amorphous silica is 6 wt% or more and the relative humidity is 50 to 90%. The carbonated cured product may have a weight change rate of 2 to 20% and a specific strength of 200 m or more.
(Weight increase in moisture absorption for 24 hours after alkali treatment) / (sample weight before alkali treatment) Formula (2)

  The weight change rate represented by the above formula (2) means the moisture absorption increase weight of the portion excluding the alkali-soluble component contained in the carbonated cured body based on the weight before the alkali treatment. If the rate is less than 2%, it means that the effective moisture absorption increase weight of the component having chemical stability with respect to the alkaline solution contained in the carbonated cured body is small, and the moisture absorption / release performance is insufficient. And durability regarding moisture absorption / release performance may be insufficient. Moreover, when the said weight change rate exceeds 20%, the intensity | strength of the obtained carbonation hardening body may become inadequate.

  The carbonated cured product of the present invention may be a carbonated cured product comprising calcium carbonate, amorphous silica and attapulgite or sepiolite, and the amorphous silica content is 6 to 40% by weight.

Here, attapulgite is a hydrous magnesium silicate mineral generally represented by the chemical formula of Si ₈ O ₂ OMg ₅ (OH) ₂ (OH ₂ ) ₄ .H ₂ O, and sepiolite is generally MgSi ₁₂ O ₃₀ ( OH) ₄ (OH ₂ ) A hydrous magnesium silicate mineral represented by ₄ · 8H ₂ O. The crystal structure of attapulgite is needle-like or fibrous having a size of about 1 μm, and it is suitable in terms of moisture absorption / release performance and moldability when combined with a carbonized structure.

  The presence of attapulgite in the carbonated cured product can be confirmed by, for example, X-ray diffraction measurement. When the carbonated cured product contains attapulgite, diffraction peaks are present at 2θ = 8.4 to 8.6 and 19.8 to 19.95 ° in X-ray diffraction measurement using copper as a tube. This can be confirmed. Furthermore, in addition to the above, it can be confirmed from the presence of a broad peak comprising a plurality of peaks in the vicinity of 27 to 28 °.

  The carbonated cured body of the present invention comprises calcium carbonate, amorphous silica, and hydrous magnesium silicate mineral obtained by firing attapulgite or sepiolite at 150 to 800 ° C., and the content of amorphous silica is 6 to 6. It may be a carbonated cured product characterized by being 40% by weight. The hydrated magnesium silicate mineral is obtained by calcining attapulgite or sepiolite to partially remove hydroxyl groups.

  Attapulgite and sepiolite with nano-sized pores have extremely excellent moisture absorption and desorption properties and chemical substance adsorption properties, but the primary particles are fibrous and have many hydroxyl groups on the surface, so that water can pass through them. When molding with building materials, etc., there is a problem that water is firmly adsorbed around the mineral, making dehydration molding difficult. In particular, in order to obtain a high-performance moisture-absorbing / releasing cured body, the amount of attapulgite and the like is increased, and this problem in the molding process has been serious. However, if firing is performed in the above temperature range, desorption and amorphousization of the hydroxyl group progresses, and the problem in dehydration molding can be solved.

  That is, in the shaping process before the carbonation treatment, for example, a molding method in which the raw material is in a slurry state is used, such as papermaking molding (excellent in productivity) and dehydration press molding method (excellent in surface decoration). In this case, when the hydrous magnesium silicate mineral fired at 150 to 800 ° C. is used, the thixotropy in the slurry state is lowered as compared with the unfired one, and the dehydration treatment can be performed very efficiently.

  Controlling the hydroxyl group of the hydrous magnesium silicate mineral in this way not only improves the moisture absorption / release function, but can also exert an effect in the process of obtaining an inorganic cured body.

  If the firing temperature is too low, the resulting cured body has insufficient moisture absorption and release performance, and the thixotropy in the slurry state is strong and the productivity tends to be low. If the firing temperature is too high, The pores of the hydrous magnesium silicate mineral may disappear, and the moisture absorption / release performance of the resulting cured product may deteriorate. Moreover, the iron component contained in trace amount may oxidize and a coloring phenomenon may occur. A more preferable firing temperature is 200 to 500 ° C.

Furthermore, the said hydrous magnesium silicate mineral is preferable at the point which the dehydrating property in a manufacturing process and the physical property of the hardened | cured body obtained further improve that the median diameter is 5-50 micrometers.
The hydrous magnesium silicate mineral forms secondary particles (lumps) in which primary particles having a fiber form are aggregated, but maintains the particle mass even when dispersed in water. The median diameter here refers to a value obtained by measuring the secondary particle diameter. When the median diameter is less than 5 μm, the particles are too tightly packed during dehydration molding, and the water passage cannot be obtained, and the dehydration property may be impaired. In addition, if the median diameter exceeds 50 μm, not only the moisture absorption / release performance of the resulting cured product may be insufficient, but the space between secondary particles will be too large, and sufficient effect treatment will not be performed. Body strength may be reduced. In the present invention, the median diameter is a particle diameter generally used when evaluating the particle size distribution, and means a so-called 50% diameter.

  Further, the hydrous magnesium silicate mineral is preferable in that the primary particles have a fiber length of 0.5 to 1.5 μm in that the dehydrating property at the time of molding is improved. If it is shorter than 0.5 μm, the specific surface area becomes too high and water retention is increased, and sufficient non-thixotropic properties may not be obtained. May be.

  In addition, it is preferable that the hydrated magnesium silicate mineral contains kaolinite and silica sand in terms of improving the dewaterability during molding and improving the strength of the resulting cured product.

  In the carbonated cured product of the present invention, the weight ratio of calcium carbonate to amorphous silica (calcium carbonate / amorphous silica) is preferably 1 to 2 in terms of the balance between strength and chemical stability. When this weight ratio is less than 1, the strength of the carbonated cured product may not be sufficiently expressed, and when the weight ratio exceeds 2, the chemical stability of the carbonated cured product may be inferior. For example, wollastonite is suitable as a raw material for the carbonation treatment in which the weight ratio tends to be in the above range.

  The carbonized cured body of the present invention may be obtained by carbonizing an inorganic material composed of 10 to 80% by weight of a porous material and 20 to 90% by weight of wollastonite.

If the amount of porous material is too small (too much wollastonite content), there is a problem that sufficient moisture absorption and desorption that is effective for reducing condensation cannot be obtained, and too much (too little wollastonite content) And), there is a problem that sufficient strength cannot be obtained. In addition, the said mixture ratio shows weight% with respect to a porous material and a wollastonite total amount.
Since the porous material is not dissolved by the alkali treatment, the range of the above formula can be effectively controlled by adjusting the amount of the porous material.

  The porous material is not particularly limited as long as it is generally a hygroscopic and porous material, and includes diatomaceous earth, silica gel, attapulgite, sepiolite, clay mineral, etc., but attapulgite or sepiolite in terms of moldability and chemical stability. Is preferred.

  In the above, when there are too many porous materials or too little wollastonite, mechanical strength may be insufficient, and when there are too few porous materials or too much wollastonite, moisture absorption and desorption is insufficient. There are things to do.

  When at least one selected from an adsorbent and a decomposing agent is further contained in the carbonized cured body of the present invention, the adsorbability or decomposability of the following volatile chemical substances and malodorous source substances is improved. This is preferable.

  Examples of volatile chemicals and malodorous substances include formaldehyde, acetaldehyde, acrolein, propionaldehyde, normal butyraldehyde, isobutyraldehyde, normal valeraldehyde, isovaleraldehyde, acetic acid, propionic acid, normal butyric acid, normal valeric acid, Isovaleric acid, ethyl acetate, butyl acetate, methyl isobutyl ketone, methanol, isobutanol, pyridine, toluene, xylene, paradichlorobenzene, ethylbenzene, styrene, chloropyrifos, dibutyl phthalate, tetradecane, -2-ethylhexyl phthalate, diazinon, fenocarb , Hydrogen sulfide, methyl mercaptan, ethyl mercaptan, methyl sulfide, methyl disulfide, ammonia, methylamine, dimethylamine, trimethyl Min, triethylamine, and nitrogen dioxide, and the like, generally volatile organic compounds other than these include those referred to as malodor substances.

  The adsorbent or decomposing agent for the volatile organic compound or malodorous substance is not particularly limited as long as it adsorbs or decomposes the above, but the following are preferable from the viewpoint of safety and economy.

That is, the adsorbent is at least one selected from activated carbon, zeolite, synthetic zeolite, frypontite, activated clay, sepiolite, attapulgite, silica gel, ion exchange resin, urea, hydrazide compound, azole compound and azine compound. Also good. Further, SiO ₂ -Al ₂ O ₃ system powder, the cured product of a composition comprising an alkali metal silicate and water (hereinafter, also referred to as "SA cured product") may be used. In the SA cured body, usually, pulverized powder or waste powder generated during cutting or processing is preferably used.

  Moreover, what is generally called a photocatalyst as a decomposition agent is preferable, for example, at least 1 sort (s) chosen from a titanium oxide, a zinc oxide, a tin oxide, and ferric oxide is mention | raise | lifted. Among these, titanium oxide containing anatase type crystals that exhibit a high catalytic effect under ordinary irradiation light is more preferable, and titanium oxide containing blue kite type crystals that exhibit a catalytic effect even under weak ultraviolet light is particularly preferable.

The SA cured product will be described in more detail.
The component constitution of the SiO ₂ -Al ₂ O ₃ -based powder is not particularly limited, but for example, SiO ₂ : Al ₂ O ₃ = 1: 9 to 9: 1 (weight ratio) is preferable, and the powder The whole body preferably contains 50% by weight or more of the total of SiO ₂ and Al ₂ O ₃ . When the content is less than 50% by weight, the reactivity with the alkali metal silicate aqueous solution may be lowered, and the strength of the obtained moisture absorbing / releasing layer may be lowered.

Examples of the SiO ₂ —Al ₂ O ₃ powder include those shown in the following (1) to (9), and these may be used alone or in combination of two or more. Also good.
(1): Fly ash containing 80% by weight or more of particles having a particle size of 10 μm or less
(2): Decolorized fly ash containing 80% by weight or more of particles having a particle size of 10 μm or less
(3): Inorganic powder obtained by melting fly ash or clay and spraying it in gas (4): Inorganic powder obtained by applying mechanical energy of 0.1-30 kWh / kg to clay
(5): Inorganic powder obtained by further heating the powder of (4) at 100 to 750 ° C.
(6): Inorganic powder obtained by applying mechanical energy of 0.1 to 30 kWh / kg to metakaolin
(7): Ashes of electrostatic precipitator during corundum or mullite production
(8): Ground calcined bauxite
(9): Metakaolin

Note that the normal fly ash is defined by JIS A 6201, the fine ash particles collected from a dust coal fired boiler from a pulverized coal combustion boiler, SiO ₂ 40% or more, moisture 1% or less, specific gravity 1.95 or more, The specific surface area is 2700 cm ² / g or more and passes through a 44 μm standard sieve by 75% or more. The fly ash of (1) is usually the same as the above conventional fly ash, for example, wet sedimentation classification, air classification, separation by specific gravity, etc. Conventionally known methods such as a method of classifying using a classifier, a method of pulverizing using a fine pulverizer such as a jet mill, a roll mill, and a ball mill, a method using a continuous system of a classifier and a pulverizer, etc. It can be obtained by processing.

  In the fly ash of (1) above, when the content of particles having a particle size of 10 μm or less is less than 80% by weight, the reactivity with the alkali metal silicate aqueous solution is reduced, resulting in a decrease in strength or poor curing. Sometimes.

  The decolorizing fly ash of (2) above is obtained by firing the fly ash of (1) at 400 to 1000 ° C. or firing normal fly ash at 400 to 1000 ° C., for example, by wet sedimentation classification, air classification, or specific gravity. Conventionally known methods such as separation using a conventional classifier such as separation, pulverization using a fine pulverizer such as a jet mill, roll mill, and ball mill, and a method using a continuous system of a classifier and a pulverizer It can obtain by processing by the method of.

  Fly ash is generally black, but if the calcination temperature is less than 400 ° C, decolorization may be insufficient, and if the calcination temperature exceeds 1000 ° C, it is reactive with an aqueous alkali metal silicate solution. In some cases, sufficient adsorption performance may not be obtained.

  The inorganic powder (3) can be obtained by melting fly ash or clay and spraying it into a gas. As a method of melting and spraying into a gas, for example, a thermal spraying technique applied to ceramic coating is used. Preferably, the fly ash and clay are melted at a temperature of 2000-16000 ° C. and sprayed at a speed of 30-80 m / s. Examples of the spraying method include a plasma spraying method, a high energy gas spraying method, and an arc spraying method.

The specific surface area of the inorganic powder (3) is usually controlled to 0.1 to 60 m ² / g by the thermal spraying technique.

The clay as a raw material for the inorganic powder (3) and the inorganic powder (4) is a clay containing a chemical composition of SiO ₂ ; 5 to 85% by weight, Al ₂ O ₃ ; 90 to 10% by weight. For example, kaolin minerals such as kaolinite, dickite, nacrite, halloysite, mica clay minerals such as muscovite, illite, fengite, sea chlorite, ceradonite, paragonite, branmarite, montmorillonite, beidellite, Examples include smectites such as nontronite, saponite, and soconite, chlorite, pyrophyllite, talc, and porphyry shale.

  The mechanical energy used in the production of the inorganic powders (4) to (6) means energy given by compressive force, shear force, impact force, etc., and these may be used alone or 2 You may make it act combining a seed | species or more. Examples of devices that specifically act on these include a ball mill, a vibration mill, a planetary mill, a medium stirring mill, a roller mill, a mortar, and a jet crusher.

  The particle diameter of the clay or metakaolin used in the production of the inorganic powders (4) to (6) is not particularly limited, but an average particle diameter of 0.01 to 500 μm is preferable for effective mechanical energy. More preferably, it is 0.1-500 micrometers, Most preferably, it is 0.1-100 micrometers.

  In the inorganic powders of (4) to (6) above, the mechanical energy added to the clay or metakaolin is preferably 0.1 to 30 kWh / kg, more preferably 1.0 to 26 kWh / kg. When the mechanical energy is less than 0.1 kWh / kg, the reactivity of the obtained inorganic powder with the alkali metal silicate aqueous solution tends to decrease, and when it exceeds 30 kWh / kg, the load on the pulverizer is increased. If it becomes too large, the wear and damage of the apparatus may increase, and problems such as contamination of the clay may occur. When the mechanical energy is applied, a grinding aid may be added as necessary in order to prevent adhesion of the clay or metakaolin powder to the inside of the apparatus or significant aggregation.

  Examples of the grinding aid include alcohols such as methyl alcohol and ethyl alcohol, alcohol amines such as triethanolamine, metal soaps such as sodium stearate and calcium stearate, acetone vapor and the like. These may be used alone or in combination of two or more.

  The inorganic powder (5) is obtained by allowing the above mechanical energy to act on the clay and further heating to 100 to 750 ° C., preferably 200 to 600 ° C., which improves the mechanical strength by heating. Therefore, if the heating temperature is less than 100 ° C., the strength improvement may be insufficient, and if it exceeds 750 ° C., crystallization of the inorganic powder occurs, and the reactivity to the aqueous alkali metal silicate solution is low. May decrease. Moreover, as heating time, when it becomes short, the improvement of the mechanical strength of the moisture absorption / release layer obtained will become small easily, and energy cost will increase when it becomes long, Therefore It is preferable that it is 1 minute-5 hours.

  Examples of the inorganic powders (7) and (8) include those described in JP-B-3-9060 and JP-B-4-45471.

  The metakaolin of (9) is not particularly limited, and generally commercially available products can be suitably used.

The alkali metal silicate used in the SA cured product is a silicate represented by M ₂ O.nSiO ₂ (one or more metals selected from M = K, Na, Li). In the above, when the value of n becomes small, it becomes difficult to obtain a moisture absorbing / releasing layer having a good appearance, and when it becomes large, gelation is likely to occur. Therefore, 0.01 to 8 is preferable, and 0.5 to 2. 5.
The alkali metal silicate aqueous solution is preferably one in which the alkali metal is potassium or a mixture of potassium and another alkali metal in that the moisture absorption / release property can be further improved.

The alkali metal silicate is preferably used as an aqueous solution. As the concentration of the aqueous solution, the reactivity with the SiO ₂ —Al ₂ O ₃ powder decreases as the concentration decreases, and the strength of the resulting moisture absorption / release layer may decrease, and the viscosity increases as the concentration increases. Since alkali metal salts are likely to be formed, workability during mixing and molding may be reduced. Therefore, the content is preferably 10 to 70% by weight, and more preferably 10 to 60% by weight.

The addition amount of the alkali metal silicate for obtaining the SA cured body is 1 to 100 parts by weight of SiO ₂ —Al ₂ O ₃ based powder in order to prevent cracks and the like from being generated in the moisture absorption / release layer. 300 parts by weight (10 to 1300 parts by weight as an aqueous solution) is preferable, and 10 to 250 parts by weight (10 to 1000 parts by weight as an aqueous solution) is more preferable.

The water used for the preparation of the SA cured product may be added in the form of both an aqueous solution of alkali metal silicate and water independent of the total amount of alkali metal silicate. . The addition amount of water, may not sufficiently cured becomes less, because the strength of many comes to Hygroscopic layer may decrease, relative to SiO ₂ -Al ₂ O ₃ -based powder 100 parts by weight of 10 to 1000 Parts by weight, preferably 10 to 750 parts by weight, more preferably 50 to 500 parts by weight.

In order to obtain the SA cured product, a method for preparing a composition comprising SiO ₂ -Al ₂ O ₃ powder, alkali metal silicate and water (hereinafter also referred to as “SA composition”), for example, Usual mixers such as paddle rotary mixers, rocking mixers, and screw mixers can be used. As a mixing method, a powder raw material is dry-mixed, and an alkali metal silicate aqueous solution is further added to and mixed with the obtained mixture, a method in which all raw materials are simultaneously supplied and mixed, an alkali metal silicate aqueous solution And a part of the powder raw material are mixed, and the remaining raw materials are sequentially added and mixed, and the method is not particularly limited.

  The slurry-like SA composition thus obtained may be filled into the mold by a natural drop method, or may be filled into the mold by a pump or the like. Vibration may be applied during slurry filling or after filling for slurry leveling or defoaming. Further, when the viscosity of the slurry is high, press molding may be performed. The mold is not particularly limited, and examples of the material of the mold include metal, resin, rubber, and the like. If a concavo-convex pattern is formed on the mold surface, the surface shape has excellent decorativeness according to the ruggedness of the mold surface. It is preferable in that a moisture absorbing / releasing material can be obtained.

  As the curing conditions for the SA composition, it is preferable to carry out by maintaining the atmospheric temperature between room temperature and 100 ° C. for 5 minutes to 12 hours. The heating method is not particularly limited, and examples thereof include an oven. Needless to say, if the heating temperature is increased, the curing time is shortened. When the heat curing is completed, the mold is removed and an SA cured body is obtained.

  As the SA cured body, those usually pulverized to reduce the particle size are used. The method of pulverization is not limited as long as it is a facility generally used for pulverization. Examples thereof include a ball mill, a vibration mill, a planetary mill, a medium stirring mill, a roller mill, a mortar, and a jet crusher. Moreover, you may use the dust generate | occur | produced when cut | disconnecting, grind | pulverizing, and processing this SA hardening body.

It is preferable that an alkyl group-containing polyorganosiloxane is further contained in the carbonated cured product of the present invention in that the stain resistance when used for a building member such as an interior material is improved.
Here, examples of the alkyl group-containing polyorganosiloxane include dimethylsilicones such as methylpolysiloxane and octamethyltrisiloxane, methylphenylsilicones such as methylphenylpolysiloxane, and methylpolysiloxane copolymers. In particular, in order to improve water repellency, fluorine hybrid polyorganosiloxane is preferably used.

  As a method for including an alkyl group-containing polyorganosiloxane in the carbonated cured product of the present invention, a method in which an alkyl group-containing polyorganosiloxane is blended in advance in a carbonated cured material raw material, There is a method of laminating a paint in which a group-containing polyorganosiloxane is dispersed, and the method is appropriately selected depending on the type of the alkyl group-containing polyorganosiloxane.

  The amount of the alkyl group-containing polyorganosiloxane is limited to 0.1 to 10% by weight of the carbonated cured product. If the amount is less than the above range, a sufficient anti-contamination effect cannot be obtained.

  As long as the effects of the present invention are not impaired, the carbonized cured body of the present invention may be obtained by using other reinforcing materials and additives as necessary.

(Function)

The carbonized cured body according to claim 1 is composed of calcium carbonate, amorphous silica, attapulgite, or sepiolite, and the amorphous silica content is 6 to 40% by weight. In addition to the excellent breathability and mechanical strength expressed by the body tissue, attapulgite's excellent powder fluidity and moisture absorption / release properties can provide a carbonated cured product that has both mechanical strength and moisture absorption / release properties. it can.

The carbonized cured body according to claim 2 is composed of calcium carbonate, amorphous silica, and hydrous magnesium silicate mineral obtained by firing attapulgite or sepiolite at 150 to 800 ° C., and the content of amorphous silica is Since it is 6 to 40% by weight, the hydroxyl group of the hydrated magnesium silicate mineral is controlled, the moisture absorption and desorption is improved, the dehydration efficiency during production is improved, and the above effect is more certain It becomes.

The carbonated cured product according to claim 3 is characterized in that the weight ratio of calcium carbonate to amorphous silica (weight of calcium carbonate / weight of amorphous silica) is 1 to 2. It will be more certain.

The carbonized cured body according to claim 4 is characterized in that it contains 2 to 15% by weight of pulp fiber, so that the cut formability, end shape workability, and nailing (construction) in the case of a cured body are provided. The property is good.

The carbonated cured product according to claim 5 is characterized in that the carbonated cured product further contains at least one selected from an adsorbent and a decomposing agent. The decomposability is further improved, and the above effect is further ensured.

The carbonated cured product according to claim 6 is characterized in that 0.1 to 10% by weight of an alkyl group-containing polyorganosiloxane is further contained in the carbonated cured product. Is further improved.

  The carbonated cured body of the present invention comprises calcium carbonate and a specific amount of amorphous silica, and has a specific amount of nitrogen adsorption specific surface area represented by the above formula (1) or a specific amount represented by the above formula (2). Since it has a weight change rate and the specific strength is 200 m or more, it is possible to exhibit high moisture absorption / release performance, adsorptivity and sufficient strength.

  The carbonated cured body is composed of calcium carbonate, amorphous silica, attapulgite or sepiolite, and the amorphous silica content is 6 to 40% by weight, or the weight ratio of calcium carbonate to amorphous silica ( In the case where the weight of calcium carbonate / weight of amorphous silica is 1 to 2, the above effect is further ensured.

  Furthermore, when the hydrated magnesium silicate mineral obtained by baking attapulgite or sepiolite at 150 to 800 ° C. is used, the moisture absorption and release properties and productivity are further improved, and the above effects are further ensured.

  Moreover, when the said carbonation hardening body is a thing formed by carbonating the inorganic material which consists of 10-80 weight% of porous materials and 20-90 weight% of wollastonite, high moisture absorption / release performance like the above, Adsorbability and sufficient strength can be expressed, and the above effect is further ensured when the porous material is attapulgite or sepiolite.

  As described above, according to the carbonized cured body of the present invention, when used as an interior material such as a building member, a more comfortable indoor environment is realized, and excellent moisture absorption / release characteristics, adsorption function, In addition, due to the strength characteristics, condensation and the like are effectively prevented, generation of mold and mites can be prevented, and the durability of the building can be improved. Moreover, the thing excellent in adsorptivity and decomposability | decomposability with respect to a volatile chemical substance and a bad smell can be obtained.

The present invention will be specifically described below by showing examples and comparative examples.
In addition, this invention is not limited only to the following Example.
(Example 1)
Inorganic material in which wollastonite mineral ground product (specific surface area 4.9 m ² / g, average particle size 2.6 μm) and attapulgite (made by Showa Chemical Co., product number “# 2”) are mixed at a weight ratio of 1: 1. Water was added and mixed. The mixture was shaped by press molding at a surface pressure of 20 MPa, and then the shaped body was carbonized for 30 minutes in a carbon dioxide atmosphere at 110 ° C. and 0.9 MPa to obtain a carbonized cured body.

(Example 2)
A carbonated cured body was obtained in the same manner as in Example 1 except that the mixing ratio of wollastonite and attapulgite was 2: 3 and the surface pressure during press molding was 39 MPa.

( Reference Example 1 )
A carbonated cured body was obtained in the same manner as in Example 1 except that an aluminum silicate powder produced by the following method was used instead of attapulgite as the porous material.
<Preparation of aluminum silicate powder>
Metakaolin was supplied to an ultra fine mill (Mitsubishi Heavy Industries, Ltd., 10 mm zirconia balls used, 85% by volume of ball filling), and mechanical energy of 10 kWh / kg was applied to 100 parts by weight of active metakaolin. After mixing 150 parts by weight of water glass (made by Nippon Chemical Industry Co., Ltd. [SiO ₂ : 20%, K ₂ O: 25%, water: 55%]), it was cured at 85 ° C. for 3 hours to produce aluminum silicate. An aluminum silicate powder was prepared by pulverization.

(Example 3 )
Wollastonite mineral (Shimizu Kogyo Co., Ltd., H1250F, aspect ratio 5-25) as calcium silicate, attapulgite calcined and pulverized product as hydrous magnesium silicate mineral (Showa Mining Co., Ltd., Australian attapulgite (in part) Kaolinite and silica sand-containing product), 400 ° C. fired, 200 mesh-classified product, median diameter 10 μm, fiber length 0.5 to 1.5 μm) and pulp fiber (unbeaten pulp ALABAMA Liver) in a weight ratio of 35: 50: 4 100 parts by weight of the cured product composition mixed with 337 parts by weight of water was mixed for 30 seconds with a commercially available mixer to obtain a slurry. The obtained slurry was poured into an 80 × 150 mm dehydration press mold having felt (Ichikawa Moori Co., Ltd., air permeability 74 cc) laid on the dewatering surface, and subjected to a dehydration treatment at 0.05 MPa for 120 seconds. A shaped body was obtained by pressurizing at a pressure of 5.9 MPa for 10 seconds. The obtained shaped body was left in a carbon dioxide environment at a temperature of 100 ° C. and a pressure of 10.0 MPa for 1 hour to obtain a carbonated cured body.

(Example 4 )
The same as Example 3 except that 2 parts by weight of a hydrazide compound (“Chemcat” manufactured by Otsuka Chemical Co., Ltd. product number: H1100) was further added as an adsorbent to 100 parts by weight of the wollastonite mineral in the cured product composition. Thus, a carbonated cured product was obtained.

(Example 5 )
For 100 parts by weight of the wollastonite mineral in the cured composition, 10 parts by weight of a titanium oxide slurry (Ishihara Kogyo “titanium oxide for photocatalyst” product number STS-21, titanium oxide concentration 40 wt%) as a decomposing agent, After the dehydration treatment, a carbonated cured body was obtained in the same manner as in Example 3 except that it was poured uniformly onto the shaped body.

(Example 6 )
Wollastonite mineral (Shimizu Kogyo Co., Ltd., H1250F, aspect ratio 5-25) as calcium silicate, attapulgite calcined and finely pulverized hydrated magnesium silicate mineral (Showa Mining Co., Ltd. Australian attapulgite (partially Kaori) Knight and silica sand-containing product), 400 ° C. fired, 200 mesh-classified product, median diameter 8 μm, fiber length 0.5 to 1.5 μm, pulp fiber (unbeaten pulp ALABAMA Liver), methyl group-containing polyorganosiloxane (Toray -100 parts by weight of a cured composition obtained by mixing Dow Corning Silicone Corp. Trefil F-201) at a weight ratio of 35: 50: 4: 2.7 and 337 parts by weight of water using a commercially available mixer. The mixture was mixed for 2 seconds to obtain a slurry, and a carbonated cured product was obtained in the same manner as in Example 3 .

(Example 7 )
To wollastonite minerals 100 parts by weight of the cured product composition, synthetic zeolite (Union Showa Co., Ltd., "molecular sieve" Part: HiSiv3000) as adsorbent same manner as in Example 3 except that the further addition of 10 parts by weight Thus, a carbonated cured product was obtained.

(Example 8 )
Example 3 except that 10 parts by weight of flypontite (Mizusawa Chemical Co., Ltd. “Mizukanite” product number: HP) was further added as an adsorbent to 100 parts by weight of the wollastonite mineral in the cured product composition. Similarly, a carbonized cured product was obtained.

(Comparative Example 1)
A carbonated cured product was obtained in the same manner as in Example 1 except that pulverized ALC (autoclave light weight concrete) was used instead of wollastonite and diatomaceous earth was used instead of attapulgite.

(Comparative Example 2)
Water was added to a mixture of hemihydrate gypsum and diatomaceous earth at a ratio of 1: 1, formed by press molding at a surface pressure of 20 MPa, and then coagulated and cured to obtain a cured product.

The cured bodies obtained in the above Examples and Comparative Examples were measured for moisture absorption test, bending strength, density, specific strength, chemical substance adsorption performance, water contact angle, and contamination resistance.

  The moisture absorption test of the cured body was carried out using a 7 mm thick cured body, with only one surface of the sample exposed and the remaining 5 surfaces sealed with aluminum tape. In the test, the sample was set to a constant weight in a constant temperature and humidity atmosphere at a temperature of 25 ° C. and a humidity of 50%. . The increased weight was divided by the exposed surface area of the sample to obtain the amount of moisture absorption.

  The bending strength of the cured body was measured according to a three-point bending strength test method described in JIS A5209 (ceramic tile).

  The density of the cured product was determined by an underwater immersion method (Archimedes method).

  The component analysis of the cured product is calculated from the amount of carbon dioxide gas generated when the sample is dissolved with 6N hydrochloric acid for calcium carbonate, and the one dissolved with 2N sodium hydroxide aqueous solution for amorphous silica. Measured and calculated.

Moreover, after pulverizing a part of the cured body and conducting component analysis, the specific surface area was measured, and the nitrogen adsorption specific surface area determined by the following formula (1) was calculated.
(Nitrogen adsorption specific surface area after alkali treatment) x (sample weight after alkali treatment) / (sample weight before alkali treatment) Formula (1)

Furthermore, after a part of the cured product was pulverized and subjected to component analysis, a moisture absorption test of the powder was performed, and the weight change rate obtained by the following formula (2) was calculated.
(Weight increase in moisture absorption for 24 hours after alkali treatment) / (sample weight before alkali treatment) Formula (2)
In the above powder moisture absorption test, the sample after dissolution, washing, and drying treatment with an aqueous sodium hydroxide solution was set to a constant weight in a constant temperature and humidity atmosphere at a temperature of 25 ° C. and a humidity of 50%, and after confirming the water-containing equilibrium state, The weight after standing for 24 hours in an atmosphere of 25 ° C. and 90% humidity was measured. The increased weight was defined as a 24-hour moisture absorption increased weight after the alkali treatment.

As the adsorption performance of volatile chemical substances, the formaldehyde adsorption performance of the cured product was evaluated by the following method, and the residual concentration in the gas bag after a certain time was measured.
Each cured product was cut into 40 × 40 mm, and cured at 23 ° C. and 50%, and placed in a 5-liter gas metering bag. The bag was evacuated and sealed. Into this, 4 liters of standard gas in which formaldehyde was adjusted to 0.29 ppm with standard air was injected from the cock. The concentration of formaldehyde in the gas bag containing each sample was measured at regular intervals using a product made by JMS; The measurement time and temperature are 0, 10, 20, 30, 60, 120 minutes, and 25 ° C. Thereafter, the measurement was carried out at 40 ° C. after 180 and 240 minutes. The evaluation results are shown in Table 1, and the adsorption performance of volatile chemical substances is as shown in FIG.

  For the measurement of the contact angle, 1 ml of water was dropped on the surface of the carbonized cured body and measured with a micrograph.

  Concerning the stain resistance, 1 ml of soy sauce was dropped on the cured body, left standing for 1 minute, washed with water, and the subsequent surface was visually observed.

  As is apparent from Table 1 and FIG. 1, it was found that the examples of the present invention have high strength, hygroscopicity, adsorbability and decomposability of volatile chemical substances.

It is a graph which illustrates the adsorption performance evaluation result of a volatile chemical substance.

Claims (6)

  A carbonated cured product comprising calcium carbonate, amorphous silica, and attapulgite or sepiolite, wherein the amorphous silica content is 6 to 40% by weight.   It is characterized by comprising calcium carbonate, amorphous silica, and hydrous magnesium silicate mineral obtained by firing attapulgite or sepiolite at 150 to 800 ° C., and the amorphous silica content is 6 to 40% by weight. Carbonated hardened body. The carbonated cured product according to claim 1 or 2, wherein a weight ratio of calcium carbonate to amorphous silica (weight of calcium carbonate / weight of amorphous silica) is 1 to 2 . The carbonated cured body according to any one of claims 1 to 3 , comprising 2 to 15% by weight of pulp fibers. The carbonated cured body according to any one of claims 1 to 4 , further comprising at least one selected from an adsorbent and a decomposition agent in the carbonated cured body. The carbonated cured product according to any one of claims 1 to 5 , further comprising 0.1 to 10% by weight of an alkyl group-containing polyorganosiloxane in the carbonated cured product.

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