JP5510911B2 - Composite interior coating material for buildings - Google Patents

Description

The present invention is a building materials for the purpose of improving the environmental conservation living space, but details about the composite interior coating materials used for interior finish of buildings.

As the interior finish structure of the building, inorganic porous materials such as diatomaceous earth, activated carbon, activated carbon fiber, molecular sieve carbon, silica gel, activated alumina, zeolite, etc. are blended on the surface of the base material made of gypsum board, wood, plywood, etc. A technique for forming a porous wall surface by spraying fine particles such as a coating material or shirasu is known. It is known that an inorganic porous material physically adsorbs various molecules in its pores, and has an inner wall functioning to adjust indoor humidity, adsorb odor components, and volatile organic compounds (hereinafter referred to as VOC). Such products are commercially available. On the other hand, the inner walls of buildings with photocatalyst applied have been developed for the purpose of removing odor components and VOCs, and the inner walls, ceiling, walls, floors, bathtubs, wash spaces, faucets, etc. are coated with titanium oxide for antibacterial properties. The product which gave is marketed. Titanium oxide is known as a typical photocatalytic active substance, and it is known to catalyze an oxidation reaction when irradiated with near ultraviolet rays. In addition, a visible light responsive photocatalyst that is excited by visible light of 400 to 600 nm by adding a small amount of impurities (doping) has been developed.

For example, Patent Document 1 discloses a building material characterized in that a powder carrying a photocatalyst is sprayed on a coated surface of a base material, and the powder is fixed to the coated film. In addition, it is described that the photocatalyst is titanium oxide and the powder supporting the photocatalyst is selected from silica, silica sand, zeolite, silica gel, diatomaceous earth, and allophane. There is a description that the material of the base material is not limited by this, and the function of the photocatalyst can be sufficiently exhibited.

Further, Patent Document 2 discloses an ant-proof coating agent characterized by having powdered charcoal, slaked lime or plaster, polyvinyl alcohol, and water, and adding titanium dioxide and zeolite. There is a description of the characteristic ant-proof coating agent. As a result, wood used for wooden structures such as ordinary houses is maintained for a long time from insects such as white ants, humidity control function, deodorant function, antibacterial function, antifungal function, antifouling function, antiseptic function, pest control function and There is a description that it can provide an anti-ants coating agent and a building material board coated with the same, to which an ultraviolet ray removing function is added, workability is good, environmental friendliness and low cost are realized.

JP 2003-313971 A (Claim 1, Claim 4, [0013]) JP-A-2004-244431 (Claims 1, 3, and 4)

The present invention coordinates an odor component to an inorganic porous material, an adsorption / desorption reaction of a molecule such as VOC, and a decomposition reaction of the molecule by an antibacterial / hazardous substance decomposable substance, and once the odor component adsorbed to the inorganic porous material Providing a composite interior coating material for buildings and a composite interior coating structure for buildings in which molecules such as VOC are not released into the room again, and further, by the antibacterial / hazardous substance decomposable substance in the first layer An object of the present invention is to provide a composite interior coating material for buildings having the capability of self-cleaning without saturating the pores by decomposing molecules adsorbed on the pores of the inorganic porous material.

Conventionally, when an inorganic porous material is used alone, there is an upper limit to the absolute amount of molecules adsorbed in the pores, and as the amount of adsorbed molecules increases, the pores approach saturation and eventually become saturated. There was a risk that the molecules could not be adsorbed. In addition, since physical adsorption is a much weaker interaction than an interaction such as a covalent bond, it is known that the adsorbed molecule is easily desorbed by a rise in temperature or a reduced pressure. Therefore, once adsorbed odor component and VOC are re-released indoors in response to changes in the room environment such as a rise in room temperature, there is a problem that the odor component and VOC are exposed without the resident knowing. In particular, in the winter season, the inorganic porous material is warmed by the use of a heating appliance, and it is easy to be in an environment where molecules such as VOC once adsorbed to the inorganic porous material are easily released. In addition, when using an open-type combustion appliance, it is reported that not only carbon dioxide but also nitrogen monoxide, nitrogen oxide, sulfur oxide, formaldehyde, and VOC are generated from the heating appliance itself. In households that use open-type combustion appliances such as oil fan heaters and convection type oil stoves in the winter, the above problems are more likely to appear more prominently because residents are more likely to be exposed to high-concentration odor components and VOCs. In old Japanese houses, indoor ventilation is naturally large, so odor components and VOCs generated from adhesives used in building materials, open-type combustion appliances, etc. have not been a major problem, but in recent years airtightness has increased. In a residential environment where the air quality has been reduced, indoor odor components and VOCs become a major problem due to a decrease in ventilation due to the airtightness of buildings, which is apparent from problems such as sick house syndrome.

Patent Document 1 discloses a building material characterized in that a powder carrying a photocatalyst is dispersed on a surface of a base material coated, and the powder is fixed to the coated film. A building material in which the photocatalyst is titanium oxide and the powder supporting the photocatalyst is silica, silica sand, zeolite, silica gel, diatomaceous earth, allophane, or the like is disclosed, but the odor to the inorganic porous material (powder) is disclosed. There are studies on means for coordinating the adsorption and desorption reactions of molecules such as components and VOCs with the decomposition reactions of molecules by antibacterial and harmful substance decomposable substances, and means for preventing the saturation of the pores of inorganic porous materials (powder). However, when the building material is heated by an external factor such as heating, the odor component and VOC adsorbed on the powder may leak into the room without being decomposed by the action of the photocatalyst. In addition, when the powder carrying the photocatalyst is fixed to the surface of the coating film, the powder fixed by friction falls off and it is difficult to maintain the gas adsorption capacity and resolution over a long period of time. There is.

On the other hand, Patent Document 2 discloses an ant-proof coating agent characterized by having powdered charcoal, slaked lime or plaster, polyvinyl alcohol, and water, and a building material board coated with the same, The description of adding titanium and zeolite can be found in claims 3 and 4. The ant-proof coating agent proposed here consists of a single layer of titanium dioxide, zeolite, powdered charcoal, slaked lime or stucco, polyvinyl alcohol and water. In such a single-layer coating structure, The roles of antibacterial / hazardous substance decomposable substance (photocatalyst) and inorganic porous substance (zeolite) are not clear, and it is difficult to coordinate the functions of antibacterial / hazardous substance decomposable substance and inorganic porous substance as in Patent Document 1. . Therefore, the present invention has been studied to develop a means for preventing the odor component, the re-release of VOC and the pore saturation of the inorganic porous material as described above.

In the present invention, a first layer coating material containing an antibacterial / hazardous substance decomposable substance as a surface coating material, and a second layer coating material containing an inorganic porous material having adsorption / desorption / release characteristics as an inner surface coating material, The first layer coating material contains a titanium oxide photocatalyst as an antibacterial / hazardous substance decomposable substance and a binder, and the second layer coating material is an inorganic porous material. The inorganic porous material contains a mixture of fine and coarse natural zeolite having physical adsorption ability and ion exchange ability, and the fine and coarse particles are natural zeolite. After pulverizing, the coarse particles are blended in a ratio of 2/3 to 1.5 times by weight with respect to the fine particles to obtain a mixture of fine and coarse natural zeolite, A mixture of fine and coarse natural zeolite is blended as the main component of the second layer coating material. Thus, the above-described problems are solved by the composite interior coating material for buildings having an uneven surface. In other words, by adopting a two-layer structure consisting of a layer responsible for antibacterial and harmful substance decomposition functions and a layer that adsorbs odor components, VOCs, and water molecules, the adsorption of molecules by the second layer and the decomposition by the first layer are coordinated. In other words, the odor component and VOC adsorbed and trapped in the second layer can be decomposed without leaking to the indoor side in the first layer. In addition, since the inorganic porous material in the second layer coating material is a mixture of fine and coarse natural zeolite, the surface of the second layer coating material is made uneven so that it can be worn by antibacterial / hazardous substance decomposable substances. Disappearance can be prevented.

More specifically, the second layer coating material is a coating material composed of an inorganic porous material having an ion exchange capacity in addition to a physical adsorption capacity and a hydrophilic binder, and the first layer is formed thereon, The above problems can be solved. That is, by providing the first layer containing the photocatalyst and the second layer containing the inorganic porous material separately, the first layer that decomposes the adsorbed molecules and the second layer that plays the role of adsorbing the molecules. Antibacterial and hazardous substances contained in the first layer so that the odor components adsorbed once on the inorganic porous material contained in the second layer and VOCs such as formaldehyde do not leak into the room The density of the degradable substance can be adjusted. Here, if a substance having ion exchange ability is selected as the inorganic porous material that is the main raw material of the second layer, the polar substance is retained by ion exchange. Therefore, due to external factors such as temperature rise, When VOC molecules once adsorbed from the inorganic porous material in the two layers are re-released, compared to adsorption (physical adsorption) caused by intermolecular attraction, which is said to be a relatively weak interaction such as charcoal, It is expected that the desorption rate of molecules from the second layer can be reduced. In the present invention, natural mineral belonging to the zeolite genus as the inorganic porous pledge membrane having an ion exchange capacity (hereinafter, referred to as natural zeolite) used as a main component. The second layer coating material to the natural zeolite as the main component in addition to the natural zeolite sepiolite, shirasu, diatomaceous earth, may be added to lightweight aggregates such as glass balloons.

Since the second layer coating material contains an inorganic porous material, it originally has a certain degree of heat insulation, but if necessary, lightweight aggregates such as sepiolite, shirasu, diatomaceous earth, and glass balloons can be used as the second layer. If the second layer is configured to include more voids in addition to the layer coating material, the temperature rise of the coating material is suppressed, and the desorption rate of molecules adsorbed on the inorganic porous material of the second layer accompanying the temperature increase is increased. Further reduction is possible. Here, the maximum particle size of the lightweight aggregate is assumed to be within the range of the coating thickness in the second layer coating material.

The antibacterial / hazardous substance decomposable substance of the first layer coating material may be any substance having antibacterial activity and harmful substance resolution, and a preferable example is a titanium oxide photocatalyst. The titanium oxide photocatalyst is preferably excited without being subjected to a special treatment such as ultraviolet irradiation, and is excited by visible light (400 to 800 nm) emitted from indoor lighting, that is, a general fluorescent lamp and LED, and exhibits a catalytic function. Use of a visible light responsive oxidation photocatalyst is preferred because even in a room facing the north side, the sunlight is poor and the photocatalytic activity is low and the effects of the invention cannot be obtained. The first layer is formed by mixing this antibacterial / hazardous substance decomposable substance and a binder. As the binder, an inorganic binder such as silica sol, alumina sol, or alumina cement is used. In addition, a small amount of the second layer coating material may be used instead of the binder used in the first layer, and in that case, it may be formed by thinly coating on the second layer. According to this method, since a part of the already adjusted second layer coating material can be used as it is for the binder of the first layer coating material, there is no need to newly adjust the binder for the first layer coating material. Simplification and cost reduction can be achieved.

The inorganic porous material used in the second layer coating material only needs to adsorb gas molecules by physical adsorption , and examples of such materials include foamed cement, diatomaceous earth, silica gel, allophane, activated carbon, and natural zeolite. . Among them, the production of natural zeolite in Japan is several hundred thousand tons per month. In addition to being available at a relatively low cost, it has a cation exchange capacity and molecular sieving action, and is produced in bulk. , workable other Me to obtain a particle size that required by crushing, and especially composed mainly of natural zeolite in the present invention. In particular, it is considered that polar molecules are adsorbed more strongly than physical adsorption by ion exchange as described above, which is preferable in that the desorption rate of molecules due to an increase in room temperature can be reduced as compared with physical adsorption. Most of the crystal structure of natural zeolite has been analyzed and is characterized by the fact that the rings formed by 4, 5, 6, 7 and 12-membered tetrahedral rings are connected to each other to form a tunnel and a cage. The minimum width of the tunnel is an approximate measure of the maximum diameter of a molecule that can pass through it, so that natural zeolites are appropriately selected according to the size of the target molecule to be adsorbed and the maximum capacity to adsorb the molecule. Select a mineral belonging to the group. Particularly preferred are clinoptilolite and mordenite.

Moreover, it is good also as a composite interior coating material and the composite interior coating material structure which contain the inorganic antibacterial material as an antibacterial substance in the 1st layer coating material in order to supplement the antibacterial function in the dark where photooxidation catalyst activity falls. . Examples of inorganic antibacterial agents include silver, copper, and zinc. When these inorganic antibacterial agents are used, they are used by being supported on the above-mentioned inorganic porous material.

In consideration of workability during construction, the second layer may contain a binder for increasing the plasticity to prevent cracking and improving the wear strength of the coating material. Good. Preferred binders include inorganic compounds such as kaolin group (kaolinite, halosite, etc.), smectite group (montmorillonite, etc.), vermiculite group, talc group, mica group, chlorite group, attapulgite, sepiolite, and aluminum magnesium silicate. Binder or carboxymethyl cellulose, hydrophilic organic compounds such as sodium alginate, polyvinyl alcohol, and carrageenan, or inorganic fibers such as carbon fibers, glass fibers, and metal fibers, or petroleum fibers (nylon, vinylon, etc.), and organic fiber materials such as natural fibers. Can be mentioned. By appropriately blending these binders in the second layer, cracking can be prevented and the wear strength of the coating material can be improved, and the coating material can be made into a viscous slurry to improve workability. If the coating material is difficult to cure, a hydrophilic curing agent such as cement, calcium sulfate, calcium hydroxide, calcium carbonate, calcium silicate may be added.

Using the first layer coating material and the second layer coating material, first, a second layer coating material containing an inorganic porous material having an adsorption / desorption capacity as an inner surface coating material is applied to the base material. Then, a composite interior coating material for buildings can be provided by applying and finishing a first layer coating material containing an antibacterial / hazardous substance decomposable substance as a surface coating material.

Since the oxidation reaction rate by the antibacterial / hazardous substance decomposable substance contained in the first layer is smaller than the odor component and VOC release rate from the second layer, undegraded odor component and VOC diffuse in the room. Therefore, it is possible to prevent the indoor odor component and VOC from becoming high in concentration, and to provide a composite interior coating material for buildings that does not re-release the odor component and VOC to the indoor side. .

Molecules adsorbed and trapped in the inorganic porous substance contained in the second layer are decomposed by the action of the antibacterial / hazardous substance-degrading substance contained in the first layer. Thereby, it can prevent that the pore of an inorganic porous material is saturated with the molecule | numerator which adsorb | sucked, and it becomes impossible to adsorb | suck a molecule | numerator more than a fixed amount.

By forming the sterilization / hazardous substance decomposition layer as the first layer in contact with light and outside air, the use of antibacterial materials and photocatalysts in the inner surface structure is eliminated, so that the manufacturing cost can be reduced. Moreover, the function of a photocatalyst can be sufficiently exhibited by disposing the photocatalyst only on the surface layer.

The indoor-side surface of the second layer becomes uneven when a coarse inorganic porous material is blended as will be described later. The first layer covered with the uneven second layer disappears to some extent due to friction, but the sterilization / hazardous substance decomposition layer applied to the recess is not lost due to wear or the like. Thereby, the odor component adsorbed by the moisture absorbing / releasing material, VOC and the like can be decomposed, and the function of preventing the contamination of the wall surface and the generation of molds can be achieved.

The composite interior coating material for buildings according to the present invention is more complex than adjusting the humidity, reducing odor, decomposing harmful substances, etc. Functions can be exhibited more efficiently. These humidity adjustment, removal of odors and harmful substances, and antibacterial functions are sustainable as described above, and are especially suitable for households with chemical-sensitive people and elderly facilities and medical facilities that are susceptible to infectious diseases. is there. In addition, it is effective as a countermeasure against the occurrence of mold due to condensation, and worsening of allergic symptoms and asthma symptoms due to overdried conditions, and greatly contributes to the improvement of the living environment.

Examples of the present invention will be specifically described below. FIG. 1 is a diagram schematically showing a cross section of a composite interior coating material for buildings of the present invention.

Apply base adhesive material made of aggregate, organic or inorganic binder to base material 1 such as wood (structural plywood, veneer board, etc.), mortar, gypsum board, etc. evenly with scissors, airbrush, brush etc. The third layer 2 is assumed. The third layer 2 in contact with the base material 1 is mainly composed of a binder having an organic curing adhesive function such as silicon resin or acrylic resin, or an inorganic system such as cement or gypsum, and the second layer 3 is adhered to the base material 1. Play a role. Furthermore, by using a material having as low a moisture permeability and gas permeability as possible, the movement of moisture, odor and volatile harmful chemical substances from the base material 1 to the second layer 3 can be blocked. At this time, if the second layer 3 can be adhered to the base material 1 with the required strength, or if there is no fear of volatile harmful substance scattering from the base material 1, the amount of scattering is minimal, The third layer 2 may be omitted if there is no risk of stains due to elution of wood squeeze or the like from the base material 1 to the second layer 3 and there is no risk of impairing the appearance. Examples of such a base material include gypsum board.

Ability to adsorb indoor VOCs, odorous components, etc., and absorb and release moisture directly on the base material 1 or on the third layer 2 laminated on the base material in the above-described procedure (adsorption / absorption / release moisture) The second layer 3 is formed by applying a second layer coating material having a function) with a scissors, a brush or the like. Here, one or more kinds of inorganic porous materials 5 are used as the main raw material of the second layer 3. Examples of preferable inorganic porous material 5 include foamed cement, diatomite, silica gel, allophane, activated carbon, synthetic zeolite, natural zeolite, and the like. Among natural zeolites, mordenite and clinoptilolite are produced in bulk and are easy to process by crushing and the like, and are preferable as inorganic porous materials used in the present invention. Necessary after selecting at least one of these inorganic porous materials 5 so that natural zeolite is the main component and processing them into coarse particles (200 μm or more) and fine particles (200 μm or less) using a crusher, a classifier, etc. In consideration of workability during construction, the second layer coating material is formulated by blending a binder for increasing the plasticity to prevent cracking and improving the wear strength of the coating material, or the surface of the third layer 2 or The base material 1 is coated with the coating material using a scissors, a brush, an airbrush, or the like so as to have a thickness of 1 mm to 20 mm, thereby forming the second layer 3 having adsorption and moisture absorption / release capability. Here, it is not always necessary to add all of the above-mentioned hydrophilic curing agents, organic binders, inorganic binders, inorganic fibers or organic fibers, but improvement of coatability, prevention of cracks after curing, adhesion to the substrate The quality of the second layer coating material can be controlled by appropriately selecting and blending them according to the purpose such as improvement and improvement of the wear resistance of the coating material. Preferred binders include inorganic compounds such as kaolin group (kaolinite, halosite, etc.), smectite group (montmorillonite, etc.), vermiculite group, talc group, mica group, chlorite group, attapulgite, sepiolite, and aluminum magnesium silicate. Binder or carboxymethyl cellulose, hydrophilic organic compounds such as sodium alginate, polyvinyl alcohol, and carrageenan, or inorganic fibers such as carbon fibers, glass fibers, and metal fibers, or petroleum fibers (nylon, vinylon, etc.), and organic fiber materials such as natural fibers. Can be mentioned. By appropriately blending these binders into the second layer 3, cracking can be prevented and the wear strength of the coating material can be improved, and the coating material can be made into a viscous slurry to improve workability. If the coating material is difficult to cure, a hydrophilic curing agent such as cement, calcium sulfate, calcium hydroxide, calcium carbonate, calcium silicate may be added. In addition, the cross-section of the second layer 3 can be formed to be uneven by appropriately adjusting the particle size mixing ratio of the coarse particles and fine powder of the inorganic porous material 5, and the antibacterial / hazardous substance-decomposable material described later can be formed. The surface of the second layer 3 serving as the basis for coating the first layer 4 containing 6 is a coarse inorganic porous material to enhance the application of the first layer coating material containing the antibacterial / hazardous substance decomposable substance 6 It is good also as uneven | corrugated shape by mix | blending what becomes aggregates, such as 5 or the river sand of a suitable particle size. Further, for the purpose of coloring the coating material, natural materials such as ocher and charcoal, and inorganic pigments such as petals may be used. The inorganic porous material 5 which is the main raw material of the second layer 3 thus formed plays a role of adjusting the humidity in the room and adsorbing the humidity, odor components and harmful chemical substances in the room. In addition, since the inorganic porous material 5 is contained in the second layer coating material, it originally has a certain degree of heat insulation, but if necessary, lightweight aggregates such as sepiolite, shirasu, diatomaceous earth, and glass balloons. If 7 is added to the second layer coating material so that the second layer 3 contains more voids, the temperature rise of the coating material is suppressed, and the inorganic porous material 5 of the second layer 3 accompanying the temperature increase It becomes possible to further reduce the desorption rate of the adsorbed molecules. Here, the maximum particle diameter of the lightweight aggregate 7 is assumed to be within the range of the coating thickness in the second layer coating material.

Subsequently, a first layer coating material composed of a titanium oxide photocatalyst as an antibacterial / hazardous substance decomposable substance 6 and a binder is applied to the indoor surface of the second layer 3, so that the first layer has antibacterial / hazardous substance resolution. 4 is formed. Here, with respect to the addition amount of the titanium oxide photocatalyst, the concentration of the titanium oxide photocatalyst is adjusted as appropriate so that odor components and VOCs do not leak into the room by increasing or decreasing the concentration of the titanium oxide photocatalyst with a standard of 0.01 to 20 g / m ^2. However, when higher antibacterial / hazardous substance resolution is required, when adding the second layer coating material instead of the inorganic binder as described later, the titanium oxide photocatalyst is added beyond the above standard. Also good. In addition, when an antibacterial function in a dark place is desired, an inorganic antibacterial agent such as silver ion, copper ion, or zinc ion may be further added to the first layer coating material as an antibacterial / hazardous substance decomposable substance 6. At this time, an inorganic binder such as silica sol, alumina sol, or alumina cement is used as the binder. However, the antibacterial / hazardous substance decomposable substance 6 may be mixed with the binder and applied before entering the construction site. The antibacterial / hazardous substance decomposable substance 6 may be added to the binder. Further, the second layer coating material may be added instead of the inorganic binder. The titanium oxide photocatalyst in the first layer 4 exhibits antibacterial properties in a bright place and has a function of decomposing indoor odor components and VOCs adsorbed by the second layer 3. Thereby, the composite interior coating material of this invention can exhibit the function continuously, without the indoor odor component and the adsorption | suction performance of VOC falling by the saturation of a pore. In addition, when an inorganic antibacterial material is added to the first layer 4, the antibacterial performance is exhibited even in a dark place, and a hygienic indoor environment can always be provided.

Hereinafter, the present invention will be described more specifically with reference to examples.

Example 1
After mixing each raw material directly on the plywood or mortar surface or the finished coating film with the blending ratio (grams) shown in Table 1, add the same amount of water, apply with boil and apply the second layer. The construction was performed with a thickness of 3.0 mm. As a result, in any of samples 1 to 8, construction by kneading and culling was possible. In particular, the samples 1 to 6 were all easy to construct with scissors, and the samples 2 to 4 were most excellent in workability. Further, for Samples 2 to 8, cracks did not occur after curing (the curing temperature was room temperature), and there was no problem with the surface wear resistance. About sample 1, since there were many fine particles, the amount of water was insufficient, and the crack generate | occur | produced after drying, but there was no problem of the powder fall of the surface. Here, mordenite was selected as the main raw material as the inorganic porous material, and coarse particles of 200 μm or more and fine particles of 200 μm or less obtained by crusher pulverization and air classification were blended in the coating material. Kaolin inorganic minerals and natural fibers were used as the binder, and calcium hydroxide was used as the hydrophilic curing agent. The present invention should not be understood as being limited to this embodiment.

Example 2
A coating material was applied to a plaster board base having a thickness of 12.5 mm and an area of 9 cm ² at the same raw material mixing ratio as that of sample 2 in Table 1 to prepare a sample having a coating thickness of 3 mm. On the surface, it was created what titanium oxide weight was applied visible light response type photocatalyst so that a 10g per 1 m ² "sample + Photocatalyst" (Run.4). For comparison, a blank (Run. 1), a plaster board base only (Run. 2), and a sample (Run. 3) to which no photocatalyst was applied were prepared as blanks. Each was placed in a 5 liter Tedlar bag, and immediately after 2 μl of acetone was injected, the concentration of acetone gas was measured by a gas chromatograph. Thereafter, the sample was allowed to stand while irradiating with a fluorescent lamp under the conditions of a temperature of 20 ° C. and an illuminance of 1200 lux while appropriately adding 1 μl of acetone, and the change in acetone gas concentration over time was measured by a gas chromatograph. The results are summarized in Table 2 and FIG. 1 and Run. In No. 2, it was confirmed that no acetone gas was adsorbed and the acetone concentration increased in proportion to the amount of acetone injected. Run. 3 and Run. In No. 4, acetone gas was adsorbed by the initial coating material, and the gas concentration was Run. 1 and Run. The gas concentration is lower than that of No. 2 and changes at the same level, but the gas concentration applied to the photocatalyst after 400 hours of light irradiation (Run. 4) is higher than that of the one not applied (Run. 3). The reduction was confirmed.

Example 3
In the same raw material blending ratio as Sample 2 in Table 1, Run. The coating material raw material of 1-2 was prepared. Then, titanium oxide weight adjusting visible light response type photocatalyst so as to be 1 m ² per 1g, mixed after coating raw material coating, that the photocatalyst is applied to the surface (Run.1), to advance feed coating material in the photocatalyst The coating material (Run.2) was applied to a plaster board base having a thickness of 9.5 mm and an area of 100 cm ^{2 with} a scissors to prepare a sample having a coating thickness of 3 mm. Each was cured and dried, placed in a 5 liter Tedlar bag, injected with 50 μl of acetone and allowed to stand in the dark for 5 days, and the concentration of acetone gas was measured by gas chromatography. Then, the fluorescent lamp was irradiated for 45 hours on the conditions of temperature 20 degreeC and illumination intensity 1200lux, and the density | concentration change of acetone gas was measured with the gas chromatograph. The results are as summarized in Table 3, except that Run. No. 1 is a run. Compared to 2, it was confirmed that the acetone concentration was significantly reduced. The acetone gas residual rate (%) = after irradiation / before irradiation × 100.

Reference example 1
A sample in which the blending ratio was basically the same as that of sample 2 in Table 1 and the mordenite amount was replaced with the blending ratio (grams) shown in Table 4 was obtained from Run. Created as 1 and 2. In addition, existing products (Run. 4-6) mainly composed of slaked lime and diatomaceous earth are mixed with each raw material, and then coated with a coating material on a plaster board base having a thickness of 9.5 mm and an area of 9 cm 2. A sample with a thickness of 3 mm was prepared. Each was cured and dried, placed in a 5 liter Tedlar bag, sealed with ammonia gas having a concentration of 15 to 20 ppm, and the concentration of ammonia gas was immediately measured with a detector tube. At this time, a comparison (Run. 4) in which nothing was put in the Tedlar bag was also prepared. Then, the time-dependent change of the ammonia gas adsorption rate from the initial concentration was measured with a detector tube. The results are summarized in Table 4 and FIG. 3. However, when mordenite, a zeolite genus, is used as the main raw material of the coating material (Run. 1), the adsorption rate of ammonia gas is the highest, and mordenite is the other inorganic porous material. In the case of replacement with perlite, which is a material (Run. 2), the adsorption rate slightly decreased. Moreover, about the plaster type | system | group and the diatomaceous earth type existing product (Run.4-6), the adsorption rate of ammonia gas fell compared with the time of using a zeolite (mordenite) generally.

Reference example 2
After mixing each raw material with the compounding ratio (gram) shown in Table 5, a coating material was applied with a scissors on a 12.5 mm thick plaster board substrate to prepare a sample having a coating thickness of 3 mm. The results are shown in Table 5, but when visually confirmed after curing, Run. For No. 2, cracks occurred after drying. In addition, as a result of testing the adhesion strength for each sample, Run. For 1 the best result was obtained. The adhesion strength test was performed in accordance with the adhesion strength test method of JIS A 6909 (finishing coating material for construction).

In the same raw material blending ratio as Sample 2 in Table 1, Run. One coating material raw material was prepared. Then, thickness of 9.5 mm, smeared coating material with iron in plasterboard underlying area 9cm ^2, samples were prepared for coating thickness 3 mm. In addition, as a comparative control, Run. Samples shown in 3 to 5 were prepared. After curing and drying each, the side facing the base of the second layer (the lower part of the sample) is heated to 62.5 ° C with a hot plate, and the temperature change of the inner surface of the first layer (the upper part of the sample) is continued. Measured. The results are as summarized in Table 6, but Run. 2 compared to Run. No. 1 suppresses the temperature rise at the top of the sample. Run. Even when compared with existing interior materials such as 3 to 5, it was revealed that the temperature rise suppressing effect of the coating material is large and has high heat insulation properties.

Reference example 3
A sample having a coating thickness of 5 mm was prepared by applying the coating material on a plastic plate having an area of 9 cm ² with the same raw material blending ratio as Sample 3 in Table 1. And about what put the sample in a 10-liter Tedlar bag and nothing (Blank) as a control (Blank), after sealing each target gas so that it might become initial concentration 10-12 ppm, gas was detected with a detector tube, respectively. The adsorption test was performed over time. The results are shown in Table 7.

According to Table 7, a decrease in gas concentration was quickly confirmed for both ammonia and hydrogen sulfide, which are representative odor substances, and formaldehyde, which is a causative substance of sick house syndrome.

As described above, by applying the present invention, the adsorption / desorption reaction of molecules such as odor components and VOCs on the inorganic porous material and the decomposition reaction of the molecule by the antibacterial / hazardous substance decomposable substance are coordinated. It is possible to provide a composite interior coating material for a building and a composite interior coating structure for a building in which molecules such as odor components and VOCs adsorbed on the material are not released again into the room, and further, the first layer For composite interior coating materials for buildings and structures that have the capability of self-cleaning without saturating the pores by decomposing the molecules adsorbed by the pores of the inorganic porous material with the antibacterial and harmful substance-degrading substance A composite interior paint structure can be provided.

It is the figure which showed typically the cross section of the composite interior coating structure for buildings of this invention. It is the graph which put together the result of Table 2 shown in Example 2. FIG. It is the graph which put together the result of Table 4 shown by the reference example 1. FIG.

DESCRIPTION OF SYMBOLS 1 Base material 2 3rd layer 3 2nd layer 4 1st layer 5 Inorganic porous substance 6 Antibacterial and harmful substance decomposable substance 7 Lightweight aggregate

Claims (4)

It consists of a first layer coating material containing an antibacterial / hazardous substance decomposable substance as a surface coating material, and a second layer coating material containing an inorganic porous material having adsorption / absorption / release properties as an inner surface coating material. A composite interior coating material for buildings,
The first layer coating material contains a titanium oxide photocatalyst as an antibacterial / hazardous substance decomposable substance and a binder,
The second layer coating material contains an inorganic porous material and a binder, and the inorganic porous material is mainly composed of a mixture of fine and coarse natural zeolite having physical adsorption capacity and ion exchange capacity,
The fine particles and coarse particles are those obtained by crushing natural zeolite and then air-classified, and the fine particles are mixed with 2 to 1.5 times the amount of coarse particles by weight. A mixture of coarse natural zeolite,
Building composite interior coating material in which the surface uneven by blending a mixture of natural zeolites of the fine and coarse grains as a main component of the second Sonurizai. The composite interior coating material for buildings according to claim 1, wherein the titanium oxide photocatalyst is a visible light responsive titanium oxide photocatalyst that exhibits a catalytic function in indoor lighting. The composite interior coating material for buildings according to claim 1, wherein the first layer coating material further contains an inorganic antibacterial material as an antibacterial / hazardous substance decomposable substance in addition to the titanium oxide photocatalyst. The binder in the first layer coating material is an inorganic binder,
The binder in the second Sonuri material, kaolin inorganic mineral mixture der Ru請 Motomeko 1 building composite interior coating material according natural fibers and hydrophilic curing agent.

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