JP2002001112A - Humidity controlling building material having deodorizing function and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a humidity controlling building material having a deodorizing function, which is excellent in humidity absorbing/releasing amount and water vapor permeability and has strength enough to use as a building material and by which volatile organic compounds such as aldehydes can be absorbed and immobilized. SOLUTION: A formed body consisting of calcium carbonate and amorphous silica as principal components is manufactured by cure reaction by gaseous carbon dioxide so that the formed body has 80-250 m2/g specific surface area when measured by the gaseous nitrogen adsorbing method and 1.5-30.0 mn average pore diameter. An adsorbent having the function of chemically adsorbing the volatile organic compounds such as hydrazide compounds, azole compounds and azine compounds is incorporated inside the formed body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a humidity control building material which is an inorganic material having excellent nonflammability, and has a function of adjusting indoor humidity and a deodorizing function.

[0002]

2. Description of the Related Art Conventionally, plasters containing calcium carbonate as a main component have been used as building materials having a humidity control property. Plaster has been used for a long time as a humidity control building material, but actually has a small amount of moisture absorption and desorption. Then, in order to prevent cracks due to drying shrinkage, it is necessary to increase the thickness or to mix a large amount of reinforcing fibers such as soot. However, there is a problem that the moisture absorption and desorption increases as the thickness increases, but the moisture permeability decreases.
Humidity control performance does not increase.

[0003] Plaster containing diatomaceous earth containing amorphous silica is used as a material for improving the humidity control property of the plaster.
There is a cement plate with diatomaceous earth containing amorphous silica inside.However, diatomaceous earth is deteriorated by plaster and alkali components of cement, lowering the high specific surface area that diatomaceous earth originally has, and has a sufficient humidity control effect. Not.

Further, building materials generally require strength, dimensional stability and incombustibility, but the above-mentioned materials have low strength in spite of their weight. That is, the specific strength is low. In addition, the length change rate due to water absorption is large, and cracks occur and dimensional stability is poor. When a large amount of soot is mixed in to prevent cracks, there is a problem in that the incombustibility is reduced.

[0005] By the way, volatile components such as formaldehyde contained in paints for building materials and adhesives are said to cause sick house syndrome, and have become a serious social problem. In recent years, building materials that have reduced the amount of VOCs (volatile organic compounds) such as aldehydes have been used. It is the current situation that is continuously occurring in.

[0006] Therefore, if such a (odorous) volatile component can be absorbed by the humidity control building material, a more comfortable and healthy environment can be obtained. In addition, even if it is a conventional humidity control building material, it is possible to adsorb these VOCs to some extent. However, since the adsorption phenomenon in the humidity control building material is due to physical adsorption, there is a disadvantage that once adsorbed VOC is released to the outside of the material again. Since humidity-control building materials are essentially required to adsorb moisture when the humidity of the atmosphere rises and release it when the humidity falls, repetition of such adsorption and release is an essential function. It is not possible to demand the fixation of VOC for the humidity control building materials.

Therefore, it is conceivable to apply titanium oxide particles or a binder of ferrous sulfate and L-ascorbic acid to the surface of the humidity control building material. This is because these have a function of decomposing and oxidizing an organic compound when irradiated with ultraviolet rays. However, in practice, it is difficult to irradiate the humidity control building material with sufficient ultraviolet rays in the living space (indoor), and the function cannot be fully exerted. In addition, in the surface application, the applied material closes the micropores on the surface, so that the porosity that the humidity control building material should have is impaired, and the humidity control property is also adversely affected.

On the other hand, hydrazide compounds, azole compounds, azine compounds, and the like have the property of adsorbing odor components such as aldehydes by chemical adsorption and hardly releasing them. This effect is described in, for example, JP-A-8-2807.
81 and JP-A-2000-37447. Therefore, it is conceivable to apply and impregnate the adsorbent having the chemical adsorption function to the base material of the humidity control building material, or mix it with the base material.

However, these substances are 100 to 200
Since it has a melting point in the range of ° C. and is an acidic substance, compatibility with the substrate becomes a problem. For example, since the cement-based hydraulic material is alkaline, the adsorbent is deteriorated by any method of application, impregnation, and mixing. Further, in a ceramic building material manufactured through a firing step, the adsorbent is decomposed in the firing step even if the ceramic building material is previously mixed with the raw material, and there is no other method than application to a molded body.

[0010]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems and is excellent in moisture absorption / desorption and moisture permeability, and immobilizes by absorbing volatile organic compounds such as aldehydes. It is an object of the present invention to provide a humidity control building material having a deodorizing function with sufficient strength that can be used as a building material.

[0011]

The humidity control building material having a deodorizing function according to the present invention is manufactured by a carbonic acid curing reaction, and is composed of a molded product whose main components are calcium carbonate and amorphous silica. It is a building material, and is characterized in that an adsorbent having a function of chemically adsorbing volatile organic compounds is contained in the molded body. Molded products produced by a carbonic acid curing reaction and whose main components are calcium carbonate and amorphous silica have extremely low reactivity with an adsorbent having a chemical adsorption function. And volatile organic compounds can be stably absorbed and immobilized over a long period of time. The adsorbent preferably contains at least one of a hydrazide compound, an azole compound and an azine compound.

By the way, it is generally said that the relative humidity condition for human beings to live comfortably is between 40 and 70%. In order to maintain the room humidity in the meantime, a humidity control building material exhibiting excellent humidity control performance in that range is suitable. Also, when viewed from the viewpoint of surface physics, a humidity control material has a high ability to adsorb water vapor in the air by a capillary tube of the material in a high humidity atmosphere and release the adsorbed moisture into the air in a low humidity atmosphere. It can be said that it is a material. As a result of intensive research on what kind of material can actually be an excellent humidity control building material, the present inventors have found that a molded product produced by a carbonic acid curing reaction, the main components of which are calcium carbonate and amorphous silica As described above, it has been found that the reactivity with an adsorbent having a chemical adsorption function is low and is preferable.

[0013] Further, since this type of molded article becomes porous when the carbonic acid curing reaction is carried out, it exhibits an excellent humidity control function by repeatedly adsorbing and releasing moisture in accordance with the humidity of the atmosphere. However, it has been found that the average pore diameter and the specific surface area greatly affect the humidity control performance. That is, the humidity control is performed by adsorbing / desorbing water vapor on the inner walls of the pores inside the material. Therefore, a material having a larger specific surface area is preferable because the amount of adsorbing water vapor increases, and an appropriate numerical value is 80 m ² / g or more. On the other hand, the specific surface area increases as the pores become finer. However, when the pore diameter is extremely small, it becomes difficult to release the adsorbed water vapor, so that moisture is absorbed but moisture is hardly released. For this reason, it is preferable that the above-mentioned specific surface area is obtained with pores having an average pore diameter of 1.5 nm or more. Considering these, the specific surface area measured by the nitrogen gas adsorption method is 80 to 250 m
² / g and an average pore diameter of 1.5 to 30.0 nm provided the greatest effect in terms of humidity control.

On the other hand, from the viewpoint of the ability to absorb volatile organic compounds (VOC), the humidity control building material of the present invention contains an adsorbent capable of chemically adsorbing these volatile organic compounds as described above. Therefore, there is an advantage that, unlike the method in which the volatile organic compound is simply physically adsorbed, the amount of re-emission is small and the immobilization ability is extremely high. The adsorbent having a chemical adsorption function preferably contains at least one of a hydrazide compound, an azole compound and an azine compound. These are formaldehyde, which is considered to be the cause of sick house syndrome,
This is because they have excellent chemical adsorption ability for aldehydes such as acetaldehyde.

[0015] Since volatile organic compounds tend to move in a humidity-controlling building material in the same manner as water vapor, their inclusion in a molded article having a high humidity-controlling performance as in the present invention sufficiently exerts adsorption capacity. It is effective in making it. In other words, these volatile organic compounds enter the molded body in the same manner as water vapor, and are adsorbed by the adsorbent inside the molded body, so that the adsorbent present inside the molded body also functions effectively. .

The content of the adsorbent is determined by the amount of the volatile organic compound to be adsorbed. When a hydrazide compound, an azole compound and an azine compound are used as an adsorbent, they can adsorb, for example, 10 to 60 parts by weight of formaldehyde per 100 parts by weight. Since the efficiency is high, it is preferable to set the range of 0.05 to 10% based on the total weight. When the content is less than 0.05%, the physical adsorption by amorphous silica and calcium carbonate is not so different. On the other hand, when the content is more than 10%, the strength of the humidity control building material itself is reduced, and the humidity control performance, particularly the permeability, is reduced. This is because the wet performance deteriorates, which is not preferable.

In the present invention, the form of the adsorbent in the molded article is not particularly limited. That is, the molded article of the present invention has a high moisture conductivity as described above, and the volatile organic compound easily moves in the material as in the case of water vapor, so that the adsorbent is dispersed in a granular state, and uniformly dispersed in fine particles. Alternatively, the adsorbent may be present in a layer at a specific portion, but in order to maintain the effect of absorbing the volatile organic compound, the adsorbent is preferably uniformly dispersed with fine particles.

Further, the most preferable method for producing a humidity-controlling building material having a deodorizing function according to the present invention is a powder comprising at least one of calcium silicate hydrate and calcium silicate as a main component, a hydrazide compound and an azole compound. And a raw material obtained by mixing at least one adsorbent among azine compounds,
Pressing and curing with carbon dioxide gas.

An adsorbent having a chemical adsorption function exhibiting excellent absorption capacity for VOC generally has high chemical activity and is weak to heat. For example, hydrazide compounds, azole compounds and azine compounds have melting points of 100 to 20.
It is as low as 0 ° C. and deteriorates in an alkaline atmosphere. In this regard, according to the production method of the present invention, heat of 100 ° C. or more is not required, and calcium is neutralized by carbonation, so that alkali deterioration does not occur.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION The starting material of the humidity control building material of the present invention is:
Silicic acid such as tobermorite, zonotlite, CSH gel, etc.
Granules mainly composed of calcium hydrate, for example, calcareous
Using raw material powder and siliceous raw material powder,
And the molar ratio of the silica component (CaO / SiO₂) And
The slurry prepared in such a way that the suspension type (slurry
In the same state) or in a mold (mold forming)
Reaction or autoclave reaction
Can be. Normal cement, early strength cement as calcareous raw material powder
Of Portland cement, slaked lime, quicklime, etc.
One or a mixture of two or more can be used. Also, silicic acid
Raw material powders include silica sand, silica stone powder, coal ash, silica
One or more of gel, cristobalite, diatomaceous earth, etc.
The above mixture can be used. The above calcium silicate water
CaO / SiO formulated with chemical composition of Japanese ₂Molar ratio
If unreacted siliceous material remains due to the difference,
The siliceous material becomes an aggregate. The average diameter of the remaining aggregate is 1
0 μm to 3 mm is desirable. The reaction is dehydrated or
Calcium silicate hydrate powder is produced by grinding
You. Other powders of calcium silicate hydrate include
Cement such as aerated concrete powder and ceramic sizing
Crushed secondary products, concrete waste, cement
Ludge can be used. On the other hand, calcium silicate
The material to be used is Portola, such as normal, high strength, white, etc.
Cement, γ-C₂S, wollastonite, etc.
You. One or a mixture of two or more of these powders
use.

An adsorbent having a function of chemically adsorbing at least one of a hydrazide compound, an azole compound and an azine compound is mixed with these powders. The mixing amount is preferably 0.01 to 10 parts by weight, assuming that the calcium silicate-based raw material is 100 parts by weight. The adsorbent may be mixed in any form of powder, water, organic solution,
Preferably it is a powder.

The hydrazide compound includes a monohydrazide compound (1), a dihydrazide compound (2), and a polyhydrazide compound (3 or more) depending on the number of hydrazide groups. Specific substances of the monohydrazide compound include lauric hydrazide, salicylic hydrazide, form hydrazide, acetohydrazide, propionic hydrazide,
p-hydroxybenzoic acid hydrazide, naphthoic acid hydrazide, 3-hydroxy-2-naphthoic acid hydrazide and the like, and dihydrazide compounds as adipic acid dihydrazide, dodecane diacid dihydrazide, sebacic dihydrazide, carbohydrazide, oxalic acid dihydrazide, malonic acid Dihydrazide, succinic acid dihydrazide, azelaic acid dihydrazide, maleic acid dihydrazide, fumaric acid dihydrazide, diglycolic acid dihydrazide, tartaric acid dihydrazide, malic acid dihydrazide, isophthalic acid hydrazide, terephthalic acid dihydrazide, dimeric acid dihydrazide, dimerazide dihydrazide, etc. However, polyhydrazide compounds include polyacrylic hydrazide and the like. Among them, adipic dihydrazide, dodecane diacid dihydrazide, seba Phosphate dihydrazide is preferable.

The azole compounds also include diazole compounds, triazole compounds and thiadiazole compounds. For diazole compounds, 3-methyl-5-pyrazolone, 1,3
-Dimethyl-5-pyrazolone, 3-methyl-1-phenyl-5-pyrazolone, 3-phenyl-6-pyrazolone,
Pyrazolone compounds such as 3-methyl-1- (3-sulfophenyl) -5-pyrazolone, pyrazole, 3-methylpyrazole, 1,4-dimethylpyrazole, 3,5-dimethylpyrazole, 3,5-dimethyl-1- Phenylpyrazole, 3-aminopyrazole, 5-amino-3-methylpyrazole, 3-methylpyrazole-5-carboxylic acid, 3-methylpyrazole-5-carboxylic acid methyl ester, 3-methylpyrazole-5-carboxylic acid ethyl ester And pyrazole compounds such as 3,5-methylpyrazoledicarboxylic acid.

Specific examples of the triazole compound include, for example, 1,2,3-triazole, 1,2,4-triazole, 3-n-butyl-1,2,4-triazole,
3,5-dimethyl-1,2,4-triazole, 3,5
-Di-n-butyl-1,2,4-triazole, 3-mercapto-1,2,4-triazole, 3-amino-
1,2,4-triazole, 4-amino-1,2,4-
Triazole, 3,5-diamino-1,2,4-triazole, 5-amino-3-mercapto-1,2,4-triazole, 3-amino-5-phenyl-1,2,4-
Triazole, 3,5-diphenyl-1,2,4-triazole, 1,2,4-triazol-3-one, urazole (3,5-dioxy-1,2,4-triazole), 1,2,4 -Triazole-3-carboxylic acid, 1
-Hydroxybenzotriazole, 5-hydroxy-7
-Methyl-1,3,8-triazaindolizine, 1H-
Benzotriazole, 4-methyl-1H-benzotriazole, 5-methyl-1H-benzotriazole and the like can be mentioned.

Specific examples of the thiadiazole compound include:
For example, 2-amino-5-ethyl-1,3,4-thiadiazole, 5-amino-2-mercapto-1,3,4-thiadiazole, 2,5-dimercapto-1,3,4-thiadiazole, 5-t -Butyl-2-methylamino-
1,3,4-thiadiazole, 2-amino-5-methyl-1,3,4-thiadiazole, 2-amino-1,3,
4-thiadiazole and the like can be mentioned.

Examples of the azine compound include a diazine compound, a triazine compound and a pyridazine compound. Specific examples of the diazine compound include, for example, 1,3-diazine, 2-amino-4,6-dimethyl-
1,3-diazine, 4,6-dihydroxy-1,3-diazine, 2-mercapto-1,3-diazine, 2-amino-1,3-diazine, 2,4-dihydroxy-1,3
1,3-diazines such as diazine, 2-amino-1,
4-diazine, 2,3-dimethyl-1,4-diazine,
2-methyl-1,4-diazine, 1,4-diazine-2
-Carboxylic acids, 1,4-diazines such as 2,3,5-trimethyl-1,4-diazine and the like.
Specific examples of the triazine compound include, for example, 3-amino-5,6-dimethyl-1,2,4-triazine, 3-hydroxy-5,6-diphenyl-1,2,4-triazine, benzo-1,2 , 3-Triazin-4 (3H) -one, 3- (2-pyridyl) -5,6-diphenyl-1,
2,4-triazine and the like can be mentioned. Specific examples of the pyridazine compound include, for example, pyridazine, 6-
Methyl-8-hydroxytriazolopyridazine, 4,5
-Dichloro-3-pyridazine, 6-methyl-3-pyridazone and the like. One or more mixtures of these compounds can be used as adsorbents. In addition, these adsorbents may be a mixture with a surfactant for improving water solubility or dispersibility.

In mixing the raw materials, water, aggregate, reinforcing fibers,
Pigments and the like may be mixed. The mixing of water is mainly added to improve the efficiency of the pressure molding in the next step. The molding by the uniaxial press can be applied to both the wet type and the dry type, but the wet type is not suitable because the water-soluble adsorbent flows out of the material by the press. Even in a dry press, water can be added as a molding aid. In this case,
The upper limit of the amount of water varies depending on the properties of the calcium silicate-based raw material. For example, in the case of a CSH gel synthesized with a suspension, the water content is 60% or less of the solid content, in the case of lightweight cellular concrete powder is 55% or less, and in the case of a crushed product of a scallop plate, 4% or less.
0% or less, and preferably 30% or less for γ-C ₂ S.

If necessary, the aggregate and / or the porous material may be mixed in an amount of 60% or less. Aggregates that can be mixed include, for example, silica stone powder, feldspar powder, mica, artificial lightweight aggregate, and the like, and in this case, the average particle size is preferably 10 μm to 3 mm. Examples of the porous material include those containing alumina silicates, pumice, and balun-like filler.

The addition of the aggregate and the porous material may be performed before the reaction or before the pressure molding described below. It is subjected to a hydration reaction or an autoclave reaction to produce a calcium silicate-based hydrate. For example, at 180 ° C., the main component is tobermorite, and a powder can be synthesized in which the surplus siliceous raw material becomes an aggregate. 0.1 to 5.0% reinforcing fiber, 0.01
Up to 5% of an inorganic pigment or the like can be mixed. this,
Press molding into a plate shape is performed using a press machine. Pressure is 5
-30 MPa is desirable.

Next, this is reacted and cured in a closed container using carbon dioxide gas. The steps up to here after mixing the calcium silicate-based raw material and the adsorbent are preferably performed as short as possible. This is because some granular materials exhibit high alkalinity. The reaction conditions are as follows:
It is industrially preferable that the temperature is 100 ° C. and the concentration of carbon dioxide is 2 to 100%. Due to the carbonic acid curing reaction, the calcium component in tobermorite becomes calcium carbonate and escapes,
An amorphous silica having many pores is obtained. In addition, calcium carbonate produces not only calcite as a main component but also fine vaterite. The number n
The resulting material has a very large surface area with m pores.

The humidity control building material of the present invention thus manufactured has a high moisture conductivity and a good response to a change in humidity. FIG. 1 shows an example of the pore size distribution of the humidity control building material according to one embodiment of the present invention, which is characterized by having peaks on both sides of the average pore size. A pore diameter smaller than the average increases the specific surface area, and a large pore diameter functions to increase the moisture conductivity, and a high humidity control property can be obtained by a synergistic effect. A material having a high moisture conductivity has a quick response to a change in humidity, and is preferable as a humidity control building material.

As an evaluation in an actual humidity changing atmosphere, the humidity of 70% and 30% were measured at a constant temperature of 25 ° C. for 24 hours.
A 48-hour, one-cycle test was conducted by holding for each hour, the change in the weight of the material was measured, and the amount of moisture absorbed and released per unit area was measured. As a result, the amount of moisture absorbed and released was 80 g / m ² or more per unit area.

In general, a material having a high moisture conductivity generally has many continuous voids and a low density, so that the strength is often low. However, the humidity control building material of the present invention has a specific strength of 180 m or more, and thus has a high strength. Is enough. Incidentally, the bulk density preferably is about 500~2000kg / ^{m 3.}
In order to obtain such properties, the composition of the molded body should be composed of 15% to 65% of calcium carbonate and 15% to 45% of amorphous silica.
%, And / or an aggregate and / or a porous material.

The above-mentioned molded article may contain 60% or less of the aggregate and / or the porous material. If the porous material is 60% or less, the molded body can be adjusted while maintaining a sufficient specific strength. Moisture performance can be improved.

By setting the aggregate to 60% or less and the average particle size of the aggregate to 10 μm or more, JIS A54
The length change rate due to water absorption shown in No. 30 can be set to 0.25% or less, and the dimensional stability can be excellent. The length change rate due to water absorption is JIS A5
This is because, as indicated by 430, 0.25% or less is desirable. Here, as the aggregate, silica stone powder, feldspar powder, mica, artificial lightweight aggregate, and the like can be used.
As the porous material, a material containing alumina silicates, a pumice stone, a balun-like filler, or the like can be used.

The main component calcium carbonate is heated to 700 ° C.
When heated at the above high temperature, an endothermic reaction occurs and dissociates into carbon dioxide and calcium oxide. Therefore, it is also a building material with excellent nonflammability.

[0037]

[Examples 1-7] using silica stone powder as slaked lime powder and siliceous material as calcareous material, CaO / SiO ₂ is 0.2
The powder was adjusted to be 5. It was synthesized in an autoclave at 180 ° C. for 4 hours for tobermorite. The hydrazide compound adsorbent (Chem Catch, Otsuka Chemical Co., Ltd.) was added to 0.05 parts by weight of 100 parts by weight of the resulting powder.
Mixing was carried out in the amount shown in Table 1 in the range of 10 to 10 parts by weight. This mixture was molded at a molding pressure of 20MP using a press molding machine.
In a, a plate having a thickness of 300 mm × 300 mm × 12 mm was formed.

Using a commercially available carbon dioxide gas by the above-mentioned method, it was cured by carbonation to produce a humidity-controlled building material. The analysis of the components and the measurement of the particle size of the aggregate were carried out using a carbonated cured product using a powder to which carbohydrazide shown in Comparative Example 1 was not added. A specific measurement method will be described in the description of Comparative Example 1.

Next, the specific surface area and the average pore diameter were determined by a nitrogen adsorption method, specifically, Micromeritex Asap 2
400 (manufactured by Shimadzu Corporation). As for the humidity control performance, the moisture conductivity was also measured by a method according to JIS A1324. Next, in order to measure the amount of moisture absorbed / released, a test in which the humidity was changed at constant intervals under a constant temperature was performed as follows. First, the material is 300mm
The other five surfaces were subjected to a moisture-proof treatment with an aluminum seal so that only one corner surface had a humidity control effect. This was left in an environmental tester at a constant temperature of 25 ° C. and the humidity was kept at 30% until there was no change in the weight of the test specimen.

Next, the humidity was changed to 70%, kept for 24 hours, and the weight change due to moisture absorption when the humidity increased was measured.
%, And held for 24 hours, and a 48-hour one-cycle test was performed in which the change in weight during moisture release due to a decrease in humidity was measured, and the amount of moisture absorbed and released per unit area of the test specimen was measured. The amount of moisture absorption / release was determined by the following equation. Moisture absorption / desorption = ((weight change when absorbing moisture + weight change when releasing moisture) / 2) / area of specimen Next, the material is processed into 100 mm x 25 mm x 12 mm (thickness), and its bulk density and bending strength Was measured, and the specific intensity was calculated. Finally, the length change rate due to water absorption was measured by a method according to JIS A 5430.

Further, the adsorption and release of aldehyde were evaluated. 20 × 20 × 12 mm cut specimens
What was put on conditions of 60 ° C and 60% of relative humidity was used. The sample is placed in a 1 liter vinyl gas metering bag, and the inside of the bag is evacuated to completely remove air. An experimental standard gas obtained by diluting formaldehyde to about 500 ppm with nitrogen gas is introduced into the bag from a cock attached to the bag, and the bag is filled substantially at atmospheric pressure. After a lapse of 24 hours, the gas is connected to a cock (collecting port) with a gas detection tube, the gas in the bag is collected, the gas concentration is measured, and the amount of adsorption is measured. Next, a similar test was performed in an atmosphere at a temperature of 40 ° C., and the aldehyde concentration was measured.

Table 1 shows the results. FIG. 1 shows a distribution diagram of the pore size of the humidity control building material of Example 1. It is characterized by having peaks on both sides of the average pore diameter of 9.5 nm. A pore diameter smaller than the average increases the specific surface area, and a large pore diameter acts to increase the moisture conductivity. Humidity control was obtained.

[Table 1]

[0043]

Comparative Example 1 As in Examples 1 to 7, calcareous raw material powder and siliceous raw material powder were used, and Cao / SiO ₂ was 0.2%.
The powder was adjusted to 5 and hydrothermally synthesized. The synthesized powder was molded and carbonated, and the components were analyzed and the particle size of the aggregate was measured by the following method. In the component analysis of calcium carbonate, the sample was dissolved in 6N hydrochloric acid and calculated from the amount of generated carbon dioxide gas, and the amorphous silica was calculated from the amount dissolved in 2N sodium hydroxide.

For the aggregate, first, after dissolving the sample with 6N hydrochloric acid, the solution is filtered and sufficiently washed with warm water. Next, the residue on the filter paper is dissolved with 2N sodium hydroxide, neutralized with hydrochloric acid, filtered, and sufficiently washed with warm water. Finally, aggregate remaining on the filter paper was determined. As a result, calcium carbonate was 40% and amorphous silica was 29%.
% And aggregate was 29%. The average particle size of the aggregate is
The particle size distribution was measured using a SALD-2000 particle size distribution analyzer (manufactured by Shimadzu Corporation) to determine the average particle size. As a result, the average particle size of the aggregate was determined to be 68 μm. The specific surface area, average pore diameter, moisture absorption / desorption amount, moisture conductivity, bending strength, bulk density, and formaldehyde adsorption performance were measured in the same manner as in Examples 1 to 7. The results are also shown in Table 1.

[0045]

COMPARATIVE EXAMPLE 2 Using a commercially available viscous fired tile having humidity control properties, moisture conductivity, moisture absorption / desorption amount,
The bulk density, specific strength and formaldehyde adsorption amount were measured, and the results are also shown in Table 1.

In Examples 1 to 7, the specific surface area was 80 to 25.
0 m ² / g, and the average pore diameter is also 1.5-3.
Since it falls within the range of 0.0 nm, the moisture conductivity is 4.9 n.
g / (ms · Pa) or more, and the moisture absorption / desorption amount is 80 g / m
^As a result, a humidity-controlling building material having sufficient strength to satisfy ² or more and having a high humidity control performance and a specific strength of 180 m or higher was obtained.

The amount of formaldehyde adsorbed is considered as follows. It is known that the formaldehyde concentration in the air changes depending on the temperature. For example, the following equation has been proposed and used for estimating the formaldehyde concentration at different temperatures (“Guideline measures for formaldehyde concentration in the air” ( Akio Inoue Wood Industry Vol.
52 No. 1 1997). Ct = C × 1.09 (t−23) where, t: temperature (° C.) Ct: formaldehyde air concentration at t ° C. (ppm) C: formaldehyde air concentration at 23 ° C. (ppm) According to this equation, when there is a temperature change from 23 ° C. to 40 ° C., the formaldehyde concentration becomes approximately 4.3 times.

The formaldehyde concentration at 40 ° C. of the fired tile product shown in Comparative Example 2 was about 3.9 compared to that at 23 ° C.
The result is almost the same as above. This indicates that, in the material of Comparative Example 2, the formaldehyde once adsorbed was released again due to the temperature change. In Comparative Example 1, the formaldehyde concentration at 40 ° C. was not as large as that in Comparative Example 2. Therefore, it is considered that a part was adsorbed in the material, but the volatile organic compound was chemically adsorbed in the material. In Examples 1 to 7 containing an adsorbent having the function of performing the above, it is clear that the formaldehyde concentration at 40 ° C. was extremely low, and most of them were fixed inside the material.

[0049]

As described above, according to the present invention, it is possible to obtain a moisture-control building material having excellent humidity control properties and sufficient strength and excellent nonflammability. In addition, since the humidity control building materials contain an adsorbent that has the function of chemically adsorbing volatile organic compounds, they have the excellent effect of not absorbing and releasing harmful components such as formaldehyde. Play.

[Brief description of the drawings]

FIG. 1 is a graph showing a pore size distribution in Example 1 of the present invention.

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[Procedure amendment]

[Submission date] April 9, 2001 (2001.4.9)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

Wherein said adsorbent is a hydrazide compound, an azole compound and moisture control construction material having a deodorizing function according to claim 1, characterized in that it consists of at least one azine compound.

3. The humidity control building material having a deodorizing function according to claim 2 , wherein the content of the adsorbent is 0.05 to 10% of the molded body.

4. A specific strength claims 1-3 moisture control construction material having a deodorizing function according to any one of, wherein the at least 180 m.

5. A calcium carbonate in said green body is 15%
The deodorizing function according to any one of claims 1 to 4 , characterized in that the composition has a deodorizing function of up to 65%, 15 to 45% of amorphous silica, and one or both of an aggregate and a porous material. Wet building materials.

6. moisture control construction material having a deodorizing function according to any one of claims 1 to 5, characterized in that contains a vaterite in the calcium carbonate.

7. tone having a deodorizing function according to any one of claims 1 to 6, either or both of the aggregate contained in the green body and the porous material is characterized in that included more than 60% Wet building materials.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) E04B 1/64 E04B 1/64 D // C04B 111: 28 C04B 111: 28 (72) Inventor Norifumi Isu 2035 Shimoi, Shimoi-cho, Owariasahi-shi, Aichi Prefecture, Japan Building Materials Research Laboratory (72) Inventor Kenji Inagaki 2035, Shimoi-cho, Shimoi-cho, Owariasahi, Aichi Prefecture Inside the Building Materials Research Institute (72) Katsumi Hirabayashi Katsumi Hirabayashi, Aichi Prefecture 2035 Shimoi, Japan Construction Materials Research Laboratory (72) Inventor Masaji Sakashita 2035 Shimoi, Shimomachi, Owariasahi City, Aichi Prefecture F.Term, Japan Construction Materials Research Laboratory 2E001 DB03 DE01 GA03 GA81 HA00 HA21 HA22 HD11 JA01 JA03 JA06 4C080 AA06 BB02 BB04 BB10 CC02 HH05 JJ03 KK08 LL03 MM18 NN01 NN06 4D052 AA08 CA09 DA01 GA04 GB12 GB14 HA01 HA18 4G012 MB04 PB 04 PB08 PB20 4G066 AA22C AA30C AA43C AA43D AA66C AB09B AB10B BA23 BA26 BA36 CA02 CA52 CA56 DA03 FA20 FA27 FA37

Claims (9)

[Claims] 1. A humidity control building material produced by a carbonic acid curing reaction and comprising a molded body whose main components are calcium carbonate and amorphous silica, wherein a volatile organic compound is chemically adsorbed in the molded body. A humidity control building material having a deodorizing function, characterized by containing an adsorbent having a function. 2. The molded article has a specific surface area of 80 to 250 m ² / g and an average pore diameter of 1.5 to 30.0 nm as measured by a nitrogen gas adsorption method. Humidity control building material with deodorizing function. 3. The humidity control building material having a deodorizing function according to claim 1, wherein the adsorbent is made of at least one of a hydrazide compound, an azole compound, and an azine compound. 4. The humidity control building material having a deodorizing function according to claim 3, wherein the content of the adsorbent is 0.05 to 10% of the molded body. 5. The humidity control building material having a deodorizing function according to claim 1, wherein the specific strength is 180 m or more. 6. The molded body contains 15% of calcium carbonate.
The deodorizing function according to any one of claims 1 to 5, characterized in that the composition has a deodorizing function of up to 65%, amorphous silica of 15% to 45%, and one or both of an aggregate and a porous material. Wet building materials. 7. The humidity control building material having a deodorizing function according to claim 1, wherein said calcium carbonate contains vaterite. 8. The humidity control building material having a deodorizing function according to claim 1, wherein one or both of the aggregate and the porous material are contained in 60% or less. 9. A raw material obtained by mixing a particulate material mainly composed of at least one of calcium silicate hydrate and calcium silicate, and an adsorbent of at least one of a hydrazide compound, an azole compound and an azine compound. A method for producing a humidity-conditioning building material having a deodorizing function, comprising press-molding and curing and curing with carbon dioxide gas.