JP2002167524A - Composition of raw material for coating material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a composition of raw material for a coating material, which, when kneaded with water and applied, gives a coating film enhanced in strength while retaining adsorbability, moisture controlling properties, and heat insulating properties depending on the thickness of the film, and which, when kneaded with water, gives a coating material having good workability in coating and capable of efficiently absorbing carbon dioxide in the air while being dried. SOLUTION: The raw material composition for a coating material contains a diatomaceous earth, a hydraulic material and two or more air hardening materials. The hydraulic material used preferably comprises a Portland cement. The air hardening materials used preferably comprise slaked lime and a dolomite plaster. The amounts of the diatomaceous earth, the hydraulic material and the air hardening materials blended are respectively 20-40 wt.%, 10-40 wt.% and 2-30 wt.%. The composition also contains a photocatalyst in an amount of 5 wt.% or less.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a raw material composition for a coating material as a diatomaceous earth finishing material used for the interior and exterior of buildings.

[0002]

2. Description of the Related Art Conventionally, as a raw material composition for a coating material of this type, the one disclosed in JP-A-10-245255 is known. This raw material composition for a coating material contains slaked lime and diatomaceous earth as main components, and contains a re-emulsifying powder resin as an inorganic admixture, an aggregate, a thickener, and an adhesion aid. Most of them are composed of inorganic materials and natural organic substances, so that they have the effect of not generating volatile organic solvents. Then, the coating film obtained after kneading with water and coating has characteristics of having high moisture permeability and humidity control function, and having an effect of suppressing generation of mold and off-flavor.

The raw material composition for a coating material disclosed in JP-A-11-12066 contains powdered slaked lime, white cement, and powdered calcined white diatomaceous earth. And, when the slurry kneaded with water is applied to a board, a panel, a wall, or the like, the slurry has an effect of preventing dripping during a painting operation by a brush, a painting roller, or a spray painting. The coating film obtained after the application has a feature that the moisture control effect is exerted due to the porous composition of the powdered calcined white diatomaceous earth.

[0004]

SUMMARY OF THE INVENTION However, Japanese Patent Application Laid-Open
The raw material composition for a coating material described in JP-A-245255 does not include a hydraulic material in the composition, so that a coating film obtained after kneading with water and coating is insufficient in strength. there were. Further, in the raw material composition for a coating material described in JP-A-11-12066, since only slaked lime was contained as an air-hardening material, the slurry kneaded with water had low coating workability. . Therefore, there is a problem that strength and coating workability cannot be satisfied at the same time.
In addition, since the two raw material compositions for a coating material contain only one type of slaked lime as an air-hardening material, they cannot effectively absorb carbon dioxide in the air while drying. Was.

The present invention has been made by focusing on the problems existing in the prior art as described above. The purpose is to knead with water and obtain a coating film obtained after coating, while maintaining the absorptive property, humidity control property and heat insulating property according to the thickness of the coating film, while increasing the strength, An object of the present invention is to provide a raw material composition for a coating material which has good coating workability and can effectively absorb carbon dioxide in the air while drying.

[0006]

In order to achieve the above object, a raw material composition for a coating material according to the first aspect of the present invention comprises a diatomaceous earth, a hydraulic material, and two or more types of air-hard materials. The gist is to contain.

[0007] The raw material composition for a coating material according to the second aspect of the present invention is the composition according to the first aspect, wherein the hydraulic material is Portland cement, and the two or more types of air-hardening materials are slaked lime and dolomite plaster. It should be included.

[0008] The gist of the present invention according to claim 3 is that the raw material composition for a coating material further comprises a photocatalyst in the invention described in claim 1 or 2.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail. The raw material composition for a coating material according to the present invention is obtained by appropriately mixing diatomaceous earth, a hydraulic material, and two or more types of air-hardening materials. The raw material composition for a coating material includes an interior material applied to the inner surface of a building wall material and an exterior material applied to the outer surface. For interior use, the dry coating film thickness after application is 1.5 to 5 mm, and emphasis is placed on the adsorptivity especially at a thin film thickness. For exterior use, the dry coating thickness after application is 5 to 15 mm, and the strength and durability are particularly emphasized.

[0010] Diatomaceous earth is a siliceous sediment consisting of diatom remains. It has been used as a soil resistant to fire since ancient times as a raw material for seven wheels, stoves and fire-resistant insulating bricks. Its main component is silicate, which has excellent heat insulating effect and fire resistance, and is chemically stable. The surface has numerous fine holes (0.1
To 0.2 μm) are regularly arranged in a circular or needle-like shape. Due to this fine and ultra-porous structure, the specific surface area is extremely large and has excellent adsorption performance. Adsorbent that absorbs volatile organic solvents such as formaldehyde by adsorption performance, absorbs moisture porous when the humidity in the building is high, and desorbs moisture when the humidity is low Having. Also, with countless fine holes,
An air layer is formed and has heat insulating properties according to the thickness of the coating film. As the diatomaceous earth, one obtained by drying and pulverizing the diatomaceous earth to obtain fine particles of the same size as that of cement is used.

The diatomaceous earth is preferably contained in the raw material composition for coating material of the present embodiment in an amount of 20 to 40% by weight in the case of interior use. When the content is less than 20% by weight, the content of the diatomaceous earth in the content ratio with respect to the raw material composition for a coating material is small, and the adsorptive property, humidity control property, and heat insulating property are reduced. On the other hand, if it exceeds 40% by weight,
There is a shortage of hydraulic and air-hardening materials that bind diatomaceous earth, and the strength of the coating film obtained after kneading with water and coating is low. In the case of exterior use, the content is preferably 3 to 40% by weight. This is because the diatomaceous earth content per unit area is almost the same since the dried coating film after application is thicker than the interior coating. When the content is less than 3% by weight, the content of the diatomaceous earth in the content ratio with respect to the raw material composition for a coating material is small, and the adsorptive property, humidity control property, and heat insulating property are reduced. The reason for exceeding 40% by weight is the same as that for the interior.

A hydraulic material has the effect of increasing the strength of a coating film obtained after coating, and reacts with water and cures in water or air, and is also called hydraulic cement. Hydraulic cement is divided into plain cement, mixed cement and special cement. The plain cements include Portland cement, hydraulic lime, Roman cement, natural cement, alumina cement and ultra-rapid cement. Portland cement includes ordinary Portland cement, early-strength Portland cement, ultra-high-strength Portland cement, moderate heat Portland cement, sulfate-resistant Portland cement, and white Portland cement. Blended cement includes blast furnace cement, silica cement / pozzolan cement, fly ash cement, expansive cement, Somenley cement and plasterer cement. Special cements include acid-resistant cement, dental cement, cement-based solidifier, colloid cement, oil well cement and geothermal cement.

Hydraulic cement undergoes a hydration reaction by adding water, starts to harden, and increases in strength due to the attraction force due to surface energy. In addition, the attraction force due to the hydrogen bonding force is added, so that stronger strength is obtained. And, by being contained in the raw material composition for a coating material, it has an effect of increasing the strength of a coating film obtained after kneading with water and coating. In the present invention, these may be used alone or may be used as a mixture. However, Portland cement is preferably used because it is produced in large quantities and inexpensive. Above all, white Portland cement is particularly preferable because its color is white, so that the range of toning can be widened.

[0014] Portland cement as a hydraulic material is preferably contained in the raw material composition for coating material of the present embodiment in an amount of 10 to 40% by weight. When the amount is less than 10% by weight, a coating film obtained after kneading with water and coating is not sufficient in strength. On the other hand, if it exceeds 40% by weight, the content of diatomaceous earth is relatively small, and the effect of diatomaceous earth is not sufficiently exerted, or the content of two or more types of air-hardening materials is small, and slurry mixed with water is used. Means low workability.

An air-hardening material is a material which hardens in air but does not harden in water, and is also called an air-hardening cement. Air-set cements include slaked lime, calcined gypsum, anhydrite, magnesia cement and dolomite plaster. Then, two or more of these are selected and used. In this case, when gypsum (calculated gypsum or anhydrous gypsum) is selected as one of the air-hardening cements, it is desirable to select another air-hardening cement having carbon dioxide adsorption capacity. Dolomite plaster is based on Japanese Industrial Standard (JIS)
A 6903-1995. That is, tomite and other materials containing magnesia (MgO) are baked to produce calcium oxide (CaO) and magnesia (MgO).
O), water was poured into it, and calcium hydroxide [Ca (OH) ₂ ] and magnesium hydroxide [Mg (O
H) ₂ ], pulverized with a pole mill or the like, and pulverized with an air separator or the like.

In addition, the dolomite plaster has the effect of magnesium hydroxide [Mg (OH) ₂ ] as a component thereof, and the slurry kneaded in water has an appropriate viscosity due to the influence of the particle size and particle shape by the fine pulverization in the final step. Due to its characteristics, it is preferred for use. Slaked lime is preferred for use because it has water retention and water absorption.

The air-hardening material does not cure only by adding water, but solidifies only after being dried in the air, reacts with carbon dioxide gas in the atmosphere while drying, and solidifies. It becomes insoluble in water.

For example, calcined gypsum is 15 to 45 μm, slaked lime is 50 to 200 μm, and dolomite plaster is 5 to 45 μm.
It contains a large particle size of の 20 μm. And, by containing two or more types of air-hardening materials, the width of the combined particle size is widened, and when kneaded with water,
Since an appropriate viscosity is obtained and the surface area of the particles is effectively increased, it is possible to effectively absorb carbon dioxide in the air while drying during curing.

Further, by using two types of dolomite plaster and slaked lime, the range of the particle size is further expanded,
When kneaded with water, a more appropriate viscosity can be obtained, and the surface area of the particles can be more effectively increased. Therefore, during curing, carbon dioxide in the air can be more effectively absorbed while drying. And, the water retention and water absorption of slaked lime are added, and the coating workability can be further improved, and the cured coating film obtained by coating can improve the water absorption of the coating film. it can.

Slaked lime and dolomite plaster of two or more types of air-hardening materials are used in the raw material composition for a coating material of the present embodiment.
It is preferably contained in an amount of up to 30% by weight. If the amount is less than 2% by weight, the slurry obtained by kneading the coating material raw material composition and water cannot obtain good workability. On the other hand, if it exceeds 30% by weight, the content of diatomaceous earth is small and the effect of diatomaceous earth cannot be obtained, or the content of hydraulic material is small, and the strength of the coating film obtained after kneading with water and coating. Becomes weaker.

The ratio of slaked lime and dolomite plaster is
Dolomite plaster is 2 to slaked lime 1 by weight ratio
A value of 4 is preferred because the particle size spread becomes wide and the particle size distribution becomes uniform. When the weight ratio is less than 2 or more than 4, the width of the particle size is uneven, and a proper viscosity cannot be obtained.

As the components other than those described above, the following photocatalyst, powdery resin, powdery thickener, filler and the like may be added. The photocatalyst refers to an inorganic oxide or the like having photocatalytic activity, and these are semiconductor particles having a band gap. When light having an energy greater than the band gap (eg, ultraviolet light of sunlight or artificial illumination light) is irradiated on the photocatalyst, electrons and holes generated by photoexcitation move to the surface of the semiconductor particles, and the strong oxidizing ability is increased. appear. Therefore, it exerts the function of decomposing bacteria, formalin, formaldehyde and the like in contact with it. As the inorganic oxide, specifically, for example, TiO ₂ , RuO ₂ , Co
_{O, Ce 2 O 3, Cr} 2 O 3, Rh 2 O 3, V 2 O 5, ZnO , and the like. Titanium oxide of TiO ₂ includes three types of crystal, a rutile type and an anatase type belonging to a tetragonal crystal type, and a brookite type belonging to an orthorhombic crystal system. Titanium oxide having photocatalytic activity is anatase type titanium oxide. It is. By adding a photocatalyst, organic solvents such as formaldehyde can be decomposed. In particular, TiO ₂ is preferred because it is easy to handle and economical.

The photocatalyst is preferably contained in the raw material composition for coating material of the present embodiment in an amount of 5% by weight or less. When the content of the photocatalyst is more than 5% by weight, the effect of decomposing the organic solvent can be sufficiently exhibited, but the original components of the coating material are reduced, and the performance as the coating material is reduced. The cost of goods rises.

The powdery resin is a powdery synthetic resin for re-emulsifying by adding water and stirring to form an emulsion. At least one kind of an emulsion formed from a synthetic resin spray-dried can be used, thereby improving the adhesiveness. As the powder resin, vinyl acetate, vinyl propionate, vinyl esters of saturated carboxylic acids, acrylic monomers such as alkyl acrylates, ethylenically unsaturated carboxylic acids, ethylene, vinyl chloride, styrene, diacetone acrylamide, etc. It can be selected from synthetic resins obtained by copolymerizing the selected monomer mixture. From the viewpoint of re-emulsifiability, those obtained by emulsion polymerization using a water-soluble polymer such as polyvinyl alcohol as a protective colloid during these polymerizations are preferable. By adding the powdery resin to the raw material composition for coating material, the adhesiveness to the base of the slurry kneaded with water is improved, and for the coating film obtained after coating,
It has the effect of improving crack prevention, waterproofing, abrasion resistance and weather resistance.

The powdery resin is preferably contained in the raw material composition for a coating material of the present embodiment in an amount of 0.5 to 10% by weight in the case of interior use. When the amount is less than 0.5% by weight, the effect of improving the adhesiveness is reduced. On the other hand, if it exceeds 10% by weight,
Although the powdery resin has adhesiveness, the effect of increasing the strength is insufficient, and it is not expected that the strength of the coating film obtained after kneading with water and coating is improved. In the case of exterior use, the content is preferably 5% by weight or less in order to further improve the strength. The reason for exceeding 5% by weight is the same as that for interior use.

The powdery thickener may be a synthetic polymer such as methylcellulose, hydroxypropylmethylcellulose, hydroxyethylmethylcellulose, hydroxyethylcellulose, hydroxymethylcellulose, polyvinyl alcohol or the like, or a natural polymer such as starch, seaweed, gelatin, sodium alginate. A water-soluble powder thickener comprising at least one selected from molecular substances can be used. This powder thickener has the effect of improving the workability of troweling a slurry obtained by kneading a raw material composition for a coating material and water.

[0027] The filler is a material that is also a target for bonding the hydraulic material and the air-hard material. In the raw material composition for a coating material, an aggregate is used, and an inexpensive material is selected. Examples of the aggregate include silica sand, calcium carbonate, glass beads, shirasu balloon, selven, natural stones such as granite, marble, and granite, and mica powder.
Of these, natural stones that have been crushed and granulated are used. These aggregates can be selected from at least one kind. Aggregate as a filler has an effect as a filler, an effect of improving the workability of a slurry kneaded with water by adjusting the particle size distribution of the aggregate, and a coating obtained after kneading and coating with water. It has the effect of increasing the strength of the film, the effect of preventing cracking of the coating film due to shrinkage, and the effect of suppressing the price of the raw material composition for coating materials.

Aggregate is added to the raw material composition for coating material of the present embodiment.
For interior use, the content is preferably 10 to 60% by weight, and for exterior use, the content is preferably 40 to 80% by weight. When the amount is less than 10% by weight or less than 40% by weight, a coating film obtained after kneading with water and coating may cause cracks due to shrinkage, and the raw material composition for a coating material obtained is expensive. Become. On the other hand, when the content exceeds 60% by weight or 80% by weight, the content of the hydraulic material and the air-hardening material is reduced, and the strength of the coating film obtained after kneading with water and coating is low.

In the case of the interior composition, the raw material composition for a coating material of the present embodiment contains 20 to 40% by weight of diatomaceous earth, 10 to 40% by weight of a hydraulic material such as white Portland cement, and two or more kinds of air. 2-30% by weight of lime and dolomite plaster of hard material, 0-5% by weight of photocatalyst, 0.5-10% by weight of powdery resin and 10-60% by weight of aggregate are uniformly mixed with a mixer. It is a mixture. Then, 30 to 90% by weight of water is added to the above-mentioned raw material composition for a coating material, and the mixture is kneaded to form a slurry as a coating material.

In the case of exterior, diatomaceous earth is 3 to 4
0% by weight, 10 to 40% by weight of hydraulic material such as white Portland cement, 2 to 30% by weight of slaked lime and dolomite plaster of two or more types of air hardening materials, and 0 to 0% of photocatalyst
５5% by weight, powdery resin of 0.5 to 5% by weight and aggregate of 40 to 80% by weight are uniformly mixed by a mixer. Then, water is added to the raw material composition for a coating material in an amount of 10 to 30% by weight and kneaded to form a slurry as a coating material.

For both interior and exterior use, the amount of water added is
It may be changed as appropriate depending on the temperature, humidity and working conditions during use. These slurries have appropriate viscosity by having two or more types of air-hardening materials. Next, this slurry is applied to the inner wall of the building with a gold iron so that the cured film thickness becomes 1.5 to 2.5 mm for interior use and 5 to 15 mm for exterior use. Since these slurries have a hydraulic material and an air-hard material, they set after 6 to 24 hours, and have a hydraulic material, whereby the hardening proceeds and sufficient strength can be exhibited.

Next, the operation of the raw material composition for a coating material of the embodiment will be described below. The slurry is obtained by kneading the raw material composition for coating material with water. Since this slurry contains two kinds of dolomite plaster and slaked lime in the raw material composition for coating material, the slurry kneaded with water exhibits appropriate viscosity and water retention.

The above-mentioned slurry is applied to an object, set and hardened to obtain a coating film. In addition, since it contains dolomite plaster and slaked lime, it reacts with carbon dioxide in the air and solidifies while drying. By containing diatomaceous earth, this coating film absorbs organic solvents such as formaldehyde by the adsorption performance of diatomaceous earth, adsorbs moisture when the humidity in the building space is high, and absorbs it when the humidity is low. Moisture control to desorb water is exhibited. Furthermore, an air layer is formed by the myriad of fine pores of the diatomaceous earth, and heat insulation is exhibited according to the thickness of the coating film. Higher strength is exhibited by using a hydraulic material. Further, the addition of the photocatalyst exerts an effect of decomposing organic solvents such as formaldehyde.

As described above, according to this embodiment, the following effects are exhibited.・ By containing diatomaceous earth, hydraulic material, and two or more types of air-hardening materials, the coating film obtained after kneading with water and coating is heat-insulated according to the adsorptivity, humidity control, and thickness of the coating film. While maintaining the properties, it has the effect of increasing the strength, and the slurry kneaded with water has the effect of good coating workability, and the effect of effectively absorbing carbon dioxide in the air while drying. Having.

The hydraulic material is Portland cement, and the two or more types of air-hardening materials include slaked lime and dolomite plaster, so that the slurry kneaded with water exhibits a suitable viscosity and water retention, and further coating work is performed. It has the effect of improving the properties. The cured coating film obtained by coating has the effect of improving the water absorption of the coating film. In addition, at the time of curing, it has an effect of absorbing carbon dioxide gas in the air more effectively while drying.

Further, by containing a photocatalyst, it has an effect of decomposing an organic solvent such as formaldehyde, and an effect of adsorbing the decomposed organic solvent by diatomaceous earth.

[0037]

EXAMPLES Examples and comparative examples which embody the above embodiment will be described below. In addition, about the adsorption test and the decomposition confirmation test by a photocatalyst, it performed as follows.

The specimens for the adsorption test and the decomposition confirmation test using a photocatalyst were prepared by applying a raw material composition for a coating material to an asbestos slate plate having a length of 50 mm and a width of 50 mm so that the thickness of the coating film was 2.0 mm. The raw material composition for a coating material was provided as a test sample after being cured and solidified.

In the adsorption test, a test sample was placed in a bag having a capacity of 3 liters and degassed. Then, a malodorous gas whose concentration had been adjusted was injected into the bag, and the test was started. And
The residual concentration of the offensive odor gas was measured at regular intervals by a gas detector tube, and the time until the residual concentration became zero was measured.

The malodorous gases used were ammonia gas and formaldehyde gas, each having an initial concentration of 20 ppm. In the decomposition confirmation test using a photocatalyst, regarding the above-mentioned formaldehyde gas adsorption test, a test was performed under light source irradiation and without light source irradiation, and the difference was compared. A fluorescent lamp (0.04 mW / cm ² ) was used as a light source. (Example 1) The raw material composition for a coating material of Example 1 was for interior use, and was composed of 25% by weight of diatomaceous earth, 25% by weight of white Portland cement as a hydraulic material, and dolomite plaster as a hydraulic material. 15% by weight, slaked lime 5
% By weight, 5% by weight of titanium dioxide as a photocatalyst, 20% by weight of aggregate, 2% by weight of a powdery resin, and a powdery thickener,
The powdery dispersant and the pigment are mixed at 3% by weight. 80% by weight of water was added to the raw material composition for coating material, and kneaded. Then, this slurry was applied to the asbestos slate surface with a gold iron so that the coating film became 2 mm.

As a result, the coating workability was good. After the coating was cured, the strength of the obtained coating film was checked by scratching with a nail. As a result, the nail did not enter and had sufficient strength. When water droplets were dropped on the coated plate and water absorption was confirmed, water was immediately absorbed.
When the adsorption was confirmed using ammonia gas and formaldehyde, the initial concentration of 20 ppm ammonia gas was 30 ppm.
After 15 minutes, formaldehyde having an initial concentration of 20 ppm was adsorbed to a level that could not be detected by the gas detection tube after 15 minutes.
After confirming the degradability of formaldehyde with a fluorescent light,
Decomposition of formaldehyde was confirmed. (Example 2) The raw material composition for a coating material of Example 2 was for interior use, and was composed of 25% by weight of diatomaceous earth, 25% by weight of white Portland cement as a hydraulic material, and dolomite plaster as a hydraulic material. 15% by weight, slaked lime 5
3% by weight of a powdery thickener, a powdery dispersing agent, and a pigment in addition to a powdery thickener, a powdery resin, and a pigment. 80% by weight of water was added to the raw material composition for coating material and kneaded. Then, this slurry is coated with 2 m
m was applied to the asbestos slate surface with a gold iron.

As a result, the coating workability was good. After the coating was cured, the strength of the obtained coating film was checked by scratching with a nail. As a result, the nail did not enter and had sufficient strength. When water droplets were dropped on the coated plate and water absorption was confirmed, water was immediately absorbed.
When the adsorption was confirmed using ammonia gas and formaldehyde, the initial concentration of 20 ppm ammonia gas was 30 ppm.
After 15 minutes, formaldehyde having an initial concentration of 20 ppm was adsorbed to a level that could not be detected by the gas detection tube after 15 minutes. (Example 3) The raw material composition for coating material of Example 3 is for interior use, 25% by weight of diatomaceous earth, 25% by weight of white Portland cement as a hydraulic material, and gypsum plaster as a hydraulic material. Is 10% by weight, 10% by weight of magnesia cement, 25% by weight of aggregate, 3% by weight of powdery resin, and 2% by weight of a powdery thickener, a powdery dispersant and a pigment. 80% by weight of water was added to the raw material composition for coating material, and kneaded. And this slurry,
The surface of the asbestos slate was coated with a gold iron so that the coating film became 2 mm.

As a result, the coating workability was good, and after the coating was cured, the strength of the obtained coating film was checked by scratching with a nail. As a result, the nail did not enter and had sufficient strength. When water droplets were dropped on the coated plate and water absorption was confirmed, water was immediately absorbed.
When the adsorption was confirmed using ammonia gas and formaldehyde, the initial concentration of 20 ppm ammonia gas was 30 ppm.
After 15 minutes, formaldehyde having an initial concentration of 20 ppm was adsorbed to a level that could not be detected by the gas detection tube after 15 minutes. (Example 4) The raw material composition for coating material of Example 4 was for exterior use, and 15% by weight of diatomaceous earth, 10% by weight of white Portland cement as a hydraulic material, and dolomite plaster as a hydraulic material. Is 3% by weight, 1% by weight of slaked lime, 65% by weight of aggregate, 3% by weight of powdery resin, and 3% by weight of a powdery thickener, a powdery dispersant and a pigment. 15% by weight of water was added to the raw material composition for coating material and kneaded. Then, this slurry is coated with a 10 m
m was applied to the asbestos slate surface with a gold iron.

As a result, the workability of the coating was good, and after the coating was cured, the strength of the obtained coating film was checked by scratching with a nail. As a result, the nail did not enter and had sufficient strength. When water droplets were dropped on the coated plate and water absorption was confirmed, water was immediately absorbed.
When the surface of the coating film was heated and the heat insulation was confirmed, heat transfer was slower than in Comparative Example 5 described later, and the heat insulation was confirmed. When the adsorptivity was confirmed with ammonia gas and formaldehyde, ammonia gas with an initial concentration of 20 ppm was adsorbed to a level that could not be detected by a gas detector tube after 30 minutes, and formaldehyde with an initial concentration of 20 ppm was 15 ppm.
After a minute, it was adsorbed to a level that could not be detected by the gas detector tube.

Comparative Example 1 The raw material composition for a coating material of Comparative Example 1 was for interior use, and was composed of 25% by weight of diatomaceous earth, 25% by weight of white Portland cement as a hydraulic material,
A dolomite plaster as an air-hardening material is obtained by mixing 20% by weight, 25% by weight of aggregate, 3% by weight of powder resin, and 2% by weight of a powdery thickener, a powdery dispersant, and a pigment. 80% by weight of water was added to the raw material composition for coating material and kneaded. Then, this slurry was applied to the asbestos slate surface with a gold iron so that the coating film became 2 mm.

As a result, since only one kind of the air-hardening material was used, an appropriate viscosity was not obtained, and the coating workability was not so good. (Comparative Example 2) The raw material composition for a coating material of Comparative Example 2 was for interior use, and 35% by weight of diatomaceous earth, 30% by weight of white Portland cement as a hydraulic material, 30% by weight of aggregate, and powder 3% by weight of a resin, 2% by weight of a powdery thickener, a powdery dispersant and a pigment. 80% by weight of water was added to the raw material composition for coating material, and kneaded. Then, this slurry was applied to the asbestos slate surface with a gold iron so that the coating film became 2 mm.

As a result, since no air-hardening material was used, an appropriate viscosity was not obtained, and the coating workability was poor. (Comparative Example 3) Comparative Example 4 A raw material composition for a coating material was for interior use, and was 40% by weight of diatomaceous earth, 15% by weight of dolomite plaster as an air-hardening material, 5% by weight of slaked lime,
30% by weight of aggregate, 5% by weight of powder resin, and 5% by weight of a powdery thickener, a powdery dispersant, and a pigment. 80% by weight of water is added to the raw material composition for coating material,
Kneaded. Then, this slurry was applied to the surface of asbestos slate with a gold iron so that the coating film became 2 mm.

As a result, since no hydraulic material was used, the strength of the obtained coating film was checked with a nail after application and curing. The nail was inserted with a weak force, and the strength was not satisfied. .

(Comparative Example 4) The raw material composition for coating material of Comparative Example 4 was for interior use, and 40% by weight of white Portland cement as a hydraulic material and 15% by weight of dolomite plaster as a hydraulic material. %, Slaked lime is 5% by weight,
30% by weight of aggregate, 5% by weight of powder resin, and 5% by weight of a powdery thickener, a powdery dispersant, and a pigment. 80% by weight of water is added to the raw material composition for coating material,
Kneaded. Then, this slurry was applied to the surface of asbestos slate with a gold iron so that the coating film became 2 mm.

As a result, since no diatomaceous earth was used, water droplets were dropped on the obtained coating film after application and curing, and the water absorption was confirmed. As a result, almost no water absorption was found. As a result of confirming the adsorbability, the ammonia gas having an initial concentration of 20 ppm was not adsorbed to a level that could not be detected by the gas detection tube even after 24 hours. Initial concentration 20ppm
Was not adsorbed to a level that could not be detected by the gas detector tube after 24 hours. (Comparative Example 5) The raw material composition for a coating material of Comparative Example 5 was for exterior use, and 25% by weight of white Portland cement as a hydraulic material, 15% by weight of dolomite plaster as a hydraulic material, and slaked lime Is 5% by weight, 50% by weight of aggregate, 2% by weight of powdery resin, and 3% by weight of powdery thickener, powdery dispersant and pigment. 15% by weight of water was added to the raw material composition for coating material and kneaded. Then, this slurry was applied to the surface of asbestos slate with a gold iron so that the coating film became 10 mm.

As a result, after application and curing, when water droplets were dropped on the obtained coating film to confirm the water absorption, it was hardly absorbed. When the surface of the coating film was heated and the heat insulating property was confirmed, heat transfer was apparent as compared with Example 4 described above, and the heat insulating property was not possessed. As a result of confirming the adsorbability, the ammonia gas having an initial concentration of 20 ppm was not adsorbed to a level that could not be detected by the gas detection tube even after 24 hours. Formaldehyde having an initial concentration of 20 ppm was not adsorbed to a level that could not be detected by the gas detector tube after 24 hours. (Comparative Example 6) The raw material composition for coating material of Example 4 was for exterior use, and 15% by weight of diatomaceous earth, 15% by weight of white Portland cement as a hydraulic material, 65% by weight of aggregate, powder 3% by weight of a powdery resin and 2% by weight of a powdery thickener, a powdery dispersant and a pigment. 15% by weight of water was added to the raw material composition for coating material and kneaded. Then, this slurry was applied to the surface of asbestos slate with a gold iron so that the coating film became 10 mm.

As a result, since no air-hardening material was used, appropriate viscosity could not be obtained, and coating workability was not good.
Also, the thickness of the coating film could not be given. In addition,
The embodiment can be modified as follows.

A powder pigment may be added to give an arbitrary color. -In order to further increase the strength of the coating film, a water reducing agent may be added. Next, technical ideas that can be grasped from the embodiment will be described below.

(A) The raw material composition for a coating material according to claim 2 or 3, which contains 2 to 30% by weight of slaked lime and dolomite plaster as two or more kinds of air-hardening materials.
The coating material obtained by kneading the coating material raw material composition and water has a wide particle size range, and has an effect of obtaining more appropriate viscosity and an effect of increasing the strength of a coating film obtained after coating.

(B) The ratio of slaked lime and dolomite plaster as two or more types of air-hardening materials is 1: 2 by weight.
4. The raw material composition for a coating material according to claim 2, wherein: The coating material obtained from the raw material composition for a coating material has an effect that the width of the particle size is widened and the particle size distribution is uniform, and a more appropriate viscosity is obtained.

[0056]

The present invention is configured as described above, and has the following effects. According to the raw material composition for a coating material of the invention according to claim 1, the coating film obtained after kneading with water and applying the coating retains heat absorbing properties, humidity control properties, and heat insulating properties according to the thickness of the coating film. While the strength can be increased, the coating material kneaded with water has good coating workability and can effectively absorb carbon dioxide in the air while drying.

According to the raw material composition for a coating material of the second aspect, in addition to the effects of the first aspect, the viscosity, water retention and coating workability of the slurry kneaded with water are improved. In addition to the above, it is possible to improve the water absorption of the obtained coating film, and to more effectively absorb carbon dioxide gas in the air while drying during curing.

According to the raw material composition for a coating material of the third aspect of the present invention, in addition to the effects of the first or second aspect of the present invention, the obtained coating film is formed of an organic solvent such as formaldehyde. Can be decomposed. Furthermore, the decomposed organic solvent can be adsorbed by diatomaceous earth.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) C04B 14/30 C04B 14/30 28/04 28/04 C09D 1/06 C09D 1/06 1/10 1/10 F term (Reference) 4G012 PA05 PA11 PC11 PC12 PC15 4G069 AA03 AA08 BA04B BA48A CA10 CA17 CD10 DA05 EA11 FA03 FB23 4J038 AA011 AA012 HA181 HA182 HA216 HA371 HA372 HA491 HA492 HA551 HA552 HA556 KA04 KA12 NA05 NA11 NA18 PA18 PA20

Claims (3)

[Claims] 1. A raw material composition for a coating material, comprising diatomaceous earth, a hydraulic material, and two or more types of air-hardening materials. 2. The raw material composition for a coating material according to claim 1, wherein the hydraulic material is Portland cement, and the two or more types of hydraulic materials include slaked lime and dolomite plaster. 3. The raw material composition for a coating material according to claim 1, further comprising a photocatalyst.