JP2003094565A - Building board for interior finish and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a building board for interior finish which is free from scratches and exhibits a superb suction effect. SOLUTION: A gas permeable coating material containing an active carbon 3 with a particle diameter of 300 μm or less, is applied to the overall surface of an irregular base material 1 which has a recessed part 1a and a projecting part 1b formed on the surface and is composed of a porous base material having numerous pores and thus a coating material-applied layer 2 containing an active carbon, is formed. Next, a coating material for fixing an active carbon is applied to only the projecting part 1b, while the irregular base material 1 is closed by means of a roll coater. In this way, a coating material-applied layer 4 for fixing an active carbon is formed and at the same time, the active carbon 3 is imbedded into the pores of the irregular base material 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interior building board such as a ceiling material which is useful for improving the indoor air environment and a method for manufacturing the same.

[0002]

BACKGROUND OF THE INVENTION Adhesives and paints used when constructing interior building boards such as ceiling materials and wall materials contain volatile organic compounds (VOC) such as toluene and xylene. Since the gas stays in the indoor space even after the construction, it is feared that the health of consumers will be adversely affected.

Hydrophobic zeolite and activated carbon are known as materials for adsorbing and removing the VOC gas. Since hydrophobic zeolite is very expensive and is not suitable for use as a building material, activated carbon is relatively inexpensive and has a large adsorption effect, and therefore, application methods to various building materials are being studied. For example, Japanese Patent Application Laid-Open No. 1-298046 discloses an interior building board in which activated carbon is dispersed in a mineral fiber board.

[0004]

However, with this interior building board, surface finishing treatment such as cloth pasting and painting is performed during actual indoor construction, so that the interior air and interior building board The contact with activated carbon is inhibited, and the adsorption effect of activated carbon cannot be sufficiently expressed.

Furthermore, this interior building board has the following problems in the manufacturing process. That is, in the case of using powdered activated carbon, dispersing pulverized coal in water during papermaking contaminates the papermaking process. Further, when granular activated carbon is used, the granular carbon scattered on the surface of the plate is scraped off by the abrasive grains during the polishing treatment performed to obtain smoothness, which causes a new surface defect.

Therefore, it is conceivable to apply activated carbon with a binder to the surface of the substrate instead of dispersing the activated carbon in the mineral fiber board as described above. When the surface rubs, activated carbon falls off and the adsorption function deteriorates, and the dropped activated carbon damages the surface of the interior building board and pollutes it black. If the active carbon is fixed on the surface by top-coating with a resin-rich paint, the pores of the activated carbon are blocked and the adsorption performance is significantly reduced.

The present invention has been made in view of the above points, and an object thereof is to obtain an interior building board which is free from scratches and has an excellent adsorption effect.

[0008]

In order to achieve the above object, the present invention is characterized in that an uneven base material is used as a base material, and only the convex portion is top-coated.

Specifically, the inventions of claims 1 and 2 relate to interior building boards, of which claim 1
The means for solving the problems described in (1) above is an uneven base material having an activated carbon-containing coating material coating layer formed of a coating layer of a gas-permeable coating material containing activated carbon having a particle size of 300 μm or less, in which concave and convex portions are formed on the surface. The coating material coating layer for fixing activated carbon is formed on the entire surface of, and is formed only on the convex portions of the uneven base material.

With the above structure, in the invention according to claim 1, since the activated carbon is not internally added to the uneven base material, even when the uneven base material is wet-processed, the papermaking liquid and the papermaking apparatus are activated carbon. When performing wet papermaking on a substrate that is not contaminated and does not use activated carbon, it is not necessary to replace the papermaking liquid or wash the papermaking machine, and work can be performed efficiently.

Further, the activated carbon-containing coating material coating layer on the convex portions of the uneven base material is protected by the activated carbon fixing coating material coating layer so that the activated carbon does not drop off during transportation or construction. Moreover, the VOC gas in the room is adsorbed by the activated carbon in the recesses without the activated carbon fixing coating material coating layer. At this time, since the activated carbon-containing coating material coating layer has gas permeability, the adsorption performance is sufficiently exhibited even if the activated carbon is buried in the activated carbon-containing coating material coating layer.

According to a second aspect of the present invention, in the interior building board according to the first aspect, the uneven base material is made of a porous material having a large number of pores, and the activated carbon is a fine convex portion of the uneven base material. It is characterized in that it is embedded in the hole.

With the above structure, in the invention according to the second aspect, the activated carbon is embedded in the pores of the uneven base material and is difficult to fall off. Therefore, the activated carbon fixing coating material coating layer on the convex portion is formed. It is possible to use a paint with a low binder content for
Further, since the coating amount can be made small, the activated carbon is effectively prevented from falling off without lowering the adsorptivity of the activated carbon on the convex portions.

The invention according to claim 3 relates to a method for manufacturing an interior building board, which comprises first forming a concave portion and a convex portion on a surface of a gas-permeable coating material containing activated carbon having a particle diameter of 300 μm or less. And an active carbon-containing coating material coating layer is formed by coating the entire surface of an uneven base material made of a porous base material having a large number of pores, and then the uneven base material is pressed by a roll coater to form convex portions thereof. The coating material for fixing activated carbon is applied only to form a coating material coating layer for fixing activated carbon, and the activated carbon is embedded in the pores of the convex portion of the uneven base material.

With the above structure, in the invention of claim 3, the coating material for fixing activated carbon is applied by roll coating, so that only the convex portions of the uneven base material are reliably coated. Also,
Since the uneven base material is a porous base material, the activated carbon is surely embedded in the pores of the convex portion in a roll roll. Therefore, the function and effect of the second aspect can be reliably obtained.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1C shows an interior building board A according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes an uneven base material having concave portions 1a and convex portions 1b formed on the surface thereof, and the uneven base material 1 is made of a porous material having a large number of pores (not shown). The depth of the recess 1a may be such that the activated carbon 3 described later does not fall off when the coated surface is rubbed. For example, if it is 0.5 mm or more, when only the convex portion 1b is coated by the roll coater, the concave portion 1a is not coated. Generally, it is about 0.5 to 1.0 mm.

Reference numeral 2 denotes a gas-permeable activated carbon-containing coating material coating layer comprising a coating material coating layer containing granular activated carbon 3. The activated carbon-containing coating material coating layer 2 is formed on the entire surface of the uneven base material 1. The activated carbon 3 is formed and is embedded in the pores of the convex portion 1b of the uneven base material 1.

Reference numeral 4 denotes a coating material coating layer for fixing activated carbon, which is made of a coating material having a high binder content for the purpose of fixing the activated carbon 3. The coating layer 4 for fixing activated carbon is formed on the uneven base material 1. It is formed only on the convex portion 1b.

As the uneven base material 1, a mineral fiber board,
Wood fiber board called plywood, plywood, gypsum board, cement board, etc. can be used. The mineral fiber board is manufactured by a wet papermaking method. The point is an aqueous suspension in which mineral fibers and a binder are used as main raw materials, and if necessary, additives such as a binding aid, a sizing agent, and an inorganic powdery substance are added, and the mixture is uniformly dispersed in a large amount of water. Is formed into a mat shape, and the fibrous mat is wet pressed in a wet state to have a predetermined thickness and dried. The mineral fiber board thus obtained has a small specific gravity because it has a fine space inside, and particularly has a specific gravity of less than 0.5, preferably 0.35 to 0.45.
When it is about the level, it is suitable as a ceiling material or wall material for buildings because it is extremely lightweight as an inorganic material. Examples of the wood fiber board include those having a specific gravity of 0.25 to 0.30.

A concave portion 1a and a convex portion 1 are formed on the surface of the uneven base material 1.
As a method of forming b, when a mineral fiber board is taken as an example, there are a method of using an embossing plate when wet pressing a fibrous mat in a wet state, a method of applying an embossing roll to a dried board, and the like.

The activated carbon-containing coating material forming the above-mentioned activated carbon-containing coating material coating layer 2 contains an inorganic pigment, a binder and an activated carbon 3 as main components, and if necessary, a preservative, a thickener and a deodorant. A foaming agent or the like can also be added.

The inorganic pigment is not particularly limited, but examples thereof include calcium carbonate, clay, talc, silica and titanium oxide. The binder is also not particularly limited, but a water-dispersible or water-soluble binder through which a gas such as vinyl acetate copolymer, acrylic ester copolymer, polyvinyl alcohol resin aqueous solution and starch can easily pass is used. be able to. Thus, by making the activated carbon-containing coating material coating layer 2 gas permeable, not only the activated carbon 3 exposed from the activated carbon-containing coating material coating layer 2 but also the activated carbon-containing coating material coating layer 2 is buried. The adsorbing effect can also be obtained from the activated carbon 3 that is operating, and the adsorbing effect can be dramatically increased.

The addition ratio of these inorganic pigments, binders, activated carbon 3, etc. is, for example, 50 to 50% of inorganic pigment in terms of solid content.
70 parts by weight, 1 to 5 parts by weight of binder, and 1 to 10 parts by weight of activated carbon.

Particularly, when the activated carbon 3 is less than 1 part by weight, the adsorption effect is reduced, and when it exceeds 10 parts by weight,
Since the activated carbon-containing coating material coating layer 2 becomes too black or the coating film becomes weak, it is preferably set within the above range. The particle size of the activated carbon 3 is 300 μm to 40 μm.
Is preferred. This is because if the particle size exceeds 300 μm, the coating aptitude becomes poor because the spray nozzle is clogged with the activated carbon 3 when the activated carbon-containing coating material is applied by spraying.
On the other hand, if the particle size is smaller than 40 μm, the dispersibility of the activated carbon in the coating material becomes too high, and the color of the coating material becomes black, which is not suitable. Also, the viscosity rises sharply and the coating suitability deteriorates.

The activated carbon-containing coating material coating layer 2 contains the activated carbon-containing coating material in terms of solid content of 50 to 150 with respect to the uneven base material 1.
g / m ^{2 is} applied. This makes it possible to properly secure the effects described below.

The coating material forming the coating layer 4 for fixing the activated carbon fixing material contains a binder and an inorganic pigment as main components, and if necessary, a preservative, a thickener, a defoaming agent and the like are added.

As the binder, one that forms a strong film is used. Examples thereof include water dispersible binders of acrylic acid ester copolymers, acrylonitrile / butadiene copolymers, and styrene / butadiene copolymers. Inorganic pigments include calcium carbonate, clay, talc, silica and titanium oxide.

The addition ratio of the binder and the inorganic pigment is, for example, 5 to 30 parts by weight of the binder and 0 to 60 parts by weight of the inorganic pigment in terms of solid content. The coating material coating layer 4 for fixing the activated carbon is a coating material using a roll coater 1 or the like, and the coating material coating layer 2 for the activated carbon is formed on the convex portion 1b of the concave-convex substrate 1 having a solid content of 1
0 to 30 g / m ^{2 is} applied. In the coating material for fixing activated carbon, if the content of the binder is high, the coating film becomes a film and the fixing strength increases, but the adsorptivity decreases. On the other hand, if the content is low, the coating film becomes porous and the fixing strength is low, but the adsorptivity is improved. Therefore, if the resin content is selected according to the purpose, the adsorption performance will not be reduced.

The interior building board A having the above-described structure is manufactured as follows.

First, as shown in FIG. 1 (a), a concave / convex base material 1 made of a porous base material having a large number of pores and having concave portions 1a and convex portions 1b formed on its surface is prepared.

Then, as shown in FIG. 1 (b), the particle size is 3
A gas-permeable coating material containing activated carbon 3 having a size of 00 μm or less is applied to the entire surface of the uneven base material 1 by, for example, spraying to form an activated carbon-containing coating material coating layer 2.

After that, while the concavo-convex base material 1 is being pressed by a roll coater (not shown), the coating material for fixing activated carbon is applied only to the convex portion 1b, and as shown in FIG. 1 (c), the activated carbon is fixed. The coating material coating layer 4 is formed only on the convex portion 1b. At this time, the activated carbon 3 on the convex portion 1b is embedded in the pores of the convex portion 1b of the uneven base material 1 by the pressing force of the roll coater.
However, since the pressing force of the roll coater does not act on the activated carbon 3 on the concave portion 1a, it is not embedded in the pores of the uneven base material 1 but scattered in the activated carbon-containing coating material coating layer 2.

Therefore, in the interior building board A as described above, since the activated carbon-containing coating material coating layer 2 is formed on the surface of the uneven base material 1 and the activated carbon 3 is not internally added to the uneven base material 1, the uneven base material is not formed. Even when the material 1 is wet-processed, the paper-making liquid and the paper-making device are not contaminated with the activated carbon 3, and when wet-texturing the uneven substrate 1 without using the activated carbon 3, replacement of the paper-making liquid and washing of the paper-making device are unnecessary. You can work efficiently with.

Further, since the activated carbon-containing coating material coating layer 2 on the convex portion 1b of the uneven base material 1 is protected by the activated carbon fixing coating material coating layer 4, the activated carbon 3 is prevented from falling off during transportation or construction. be able to. Moreover, the VOC gas in the room can be adsorbed by the activated carbon 3 in the recess 1a without the activated carbon fixing coating material coating layer 4. At this time, since the activated carbon-containing coating material coating layer 2 has gas permeability, Even when the activated carbon 3 is buried in the activated carbon-containing coating material coating layer 2, the adsorption performance can be sufficiently exhibited.

Furthermore, since the activated carbon 3 is pressed by a roll coater and embedded in the pores of the convex portion 1b of the uneven base material 1 so as not to easily fall off, a coating material coating layer for fixing the activated carbon to the convex portion 1b is provided. Since a coating material having a low binder content can be used for 4 and the coating amount can be reduced, it is possible to effectively prevent the activated carbon 3 from falling off while ensuring the adsorption performance of the activated carbon 3 on the convex portion 1b. You can

In the above embodiment, the uneven base material 1 is used.
The activated carbon-containing coating material coating layer 2 was formed on the entire surface of the above, and then the activated carbon-fixing coating material coating layer 4 was formed. After the activated carbon-containing coating material coating layer 2 was formed, the gas-permeable coating material was colored with a pigment or the like. May be applied to form a concealing layer to conceal the activated carbon 3 and then the activated carbon fixing coating material coating layer 4 may be formed. According to this, the black or grayish color of the activated carbon 3 cannot be seen, and the design of the interior building board A can be improved by the color of the concealing layer.

Next, examples will be described together with comparative examples.

Example 1 35 parts by weight of calcium carbonate as an inorganic pigment, 20 parts by weight of clay, 3 parts by weight of vinyl acetate copolymer as a binder, 2 parts by weight of polyvinyl alcohol as a thickener, and 40 parts by weight of water. 3 parts by weight of granular activated carbon having a particle size of 250 to 150 μm (Kuraray Coal GG manufactured by Kuraray Chemical Co., Ltd.) was added to 100 parts by weight of the coating material prepared by adding 10 parts by weight and thoroughly stirred to obtain an activated carbon containing coating material. Got This activated carbon-containing coating material was applied to the surface of the uneven base material 1 of the mineral fiber board by spraying at 150 g / m ² and then 1
Active carbon-containing coating material coating layer 2 after drying at a temperature of 80 ° C. for 60 seconds
Was formed. Next, 10 parts by weight of acrylic acid ester copolymer as a binder and calcium carbonate 2 as an inorganic pigment.
5 parts by weight, 15 parts by weight of clay, 15 parts by weight of titanium oxide,
A coating material prepared by adding 5 parts by weight of polyvinyl alcohol as a thickening agent and 30 parts by weight of water to the convex portion 1 of the uneven base material 1
25 g / m ^{2 was} applied only to b by means of a roll coater to form a coating material coating layer 4 for fixing activated carbon to obtain an interior building board A of the example (see FIG. 1 (c)).

Comparative Example 1 35 parts by weight of calcium carbonate as an inorganic pigment, 20 parts by weight of clay, 3 parts by weight of vinyl acetate copolymer as a binder, 2 parts by weight of polyvinyl alcohol as a thickener, and 40 parts by weight of water. The particle size is 150 to 250 μm with respect to 100 parts by weight of the coating material prepared by adding
3 parts by weight of granular activated carbon (manufactured by Kuraray Coal GG Kuraray Chemical Co., Ltd.) was added and sufficiently stirred to obtain an activated carbon-containing coating material. This activated carbon-containing coating material was applied to the surface of the uneven base material 1 of the mineral fiber board by spraying at 150 g / m ² and then 1
Active carbon-containing coating material coating layer 2 after drying at a temperature of 80 ° C. for 60 seconds
Was formed to obtain an interior building board A of Comparative Example 1 (see FIG. 2).

COMPARATIVE EXAMPLE 2 The activated carbon-containing coating material used in Comparative Example 1 was applied to the surface of the uneven base material 1 of the mineral fiber board in the same manner as in Comparative Example 1 and dried to form the activated carbon-containing coating material coating layer 2. Was formed. Next, a coating material prepared by adding 75 parts by weight of water to 25 parts by weight of an acrylic ester copolymer as a binder is applied to the entire surface of the uneven base material 1 by spraying at 100 g / m ² to fix the activated carbon. The coating layer 4 was formed to obtain an interior building board A of Comparative Example 2 (see FIG. 3).

Comparative Example 3 35 parts by weight of calcium carbonate as an inorganic pigment, 20 parts by weight of clay, 3 parts by weight of vinyl acetate copolymer as a binder, 2 parts by weight of polyvinyl alcohol as a thickener, and 40 parts by weight of water. After coating the coating material prepared by adding 150 g / m ^{2 on} the surface of the uneven base material 1 of the mineral fiber board by spraying, it is dried at a temperature of 180 ° C. for 60 seconds and the coating layer 5 containing no activated carbon is applied. To form Comparative Example 3
The interior building board A was obtained (see FIG. 4).

The above examples and comparative examples were evaluated according to the following points.

[Toluene gas adsorption test] The interior building board A of Examples and Comparative Examples 1 to 20 is 20 cm square.
Disconnected. To make this a test piece, remove the surface
The test piece was sealed with aluminum tape. The test is 100L
Place each test body in a stainless steel chamber of
While flowing clean air into this chamber,
Is injected, and the initial concentration is 1.0 mg / m ³And gas
Chambers at 4, 8, and 24 hours post injection
The air in the chamber was collected with a collection tube. This collected sky
Qi Perkin Elmer thermal desorption device and gas chroma
Thermal desorption GC-MS method using a Tograph mass spectrometer
(ISO / FDIS16017-1) analyzed, and torue in the chamber
The concentration of the ion was determined. The residual rate of toluene is calculated by the following formula.
Therefore, the low residual rate was evaluated as the adsorption performance.

Toluene residual rate (%) after t hours = 100
-100 (initial concentration-concentration after t time) / initial concentration The results are shown in FIG. According to FIG. 5, high VOC adsorption performance was observed in Example and Comparative Example 1. In the example,
Since the activated carbon-containing coating material coating layer 2 of the concave portion 1a of the uneven base material 1 is not covered with the activated carbon fixing coating material coating layer 4 and is exposed, the adsorption effect of the activated carbon 3 is exhibited in the concave portion 1a. It is due to. In Comparative Example 1, since the activated carbon-containing coating material coating layer 4 is not present and the activated carbon-containing coating material coating layer 2 is exposed on the entire surface of the uneven base material 1, the adsorption effect of the activated carbon 3 on the entire surface of the uneven base material 1 is obtained. Is expressed.

On the other hand, in Comparative Example 2, since the entire surface of the uneven base material 1 is covered with the coating material coating layer 4 for fixing the activated carbon, the adsorption effect of the activated carbon 3 cannot be expressed, and the coating material coating layer 2 containing the activated carbon is formed. The residual rate of toluene was high as in Comparative Example 3 in which there was no.

Scratch test: A test piece of 5 cm × 30 cm was placed on an ablation tester (Uesima Seisakusho), and one cycle of the test material (friction material) moving on the surface of the test material was defined as one cycle, and this was 50 times. By repeating the cycle, the presence or absence of scratches due to the falling off of the activated carbon 3 was visually inspected.

As a result, in the embodiment in which the activated carbon-containing coating material coating layer 2 on the convex portion 1b of the uneven base material 1 is covered with the activated carbon fixing coating material coating layer 4, the entire surface of the uneven base material 1 is fixed for activated carbon. As in Comparative Example 2 in which the coating material coating layer 4 was used, almost no scratches (black streaks) were observed.

However, in Comparative Example 1 in which the coating material coating layer 4 for fixing activated carbon is not present and the coating material coating layer 2 containing activated carbon is exposed on the entire surface of the uneven base material 1, the activated carbon is applied to the convex portion 1b of the uneven base material 1. 3 was removed, and scratches (black streaks) were observed.

Therefore, it is only in the examples that it is possible to give a score in both the toluene gas adsorption test and the rubbing test.

[0051]

As described above, according to the invention of claim 1, an activated carbon-containing coating material coating layer is formed on the entire surface of the uneven base material, and the active carbon is fixed only on the convex portion of the uneven base material. Since the coating material coating layer is not formed and activated carbon is not internally added to the uneven base material, even when wet-making the uneven base material, the papermaking solution and the papermaking machine are not contaminated with the activated carbon, and the uneven surface does not use activated carbon. When the base material is wet-processed, it is not necessary to replace the paper-making liquid or to wash the paper-making apparatus, and the work can be performed efficiently. Also,
Since the activated carbon-containing coating material coating layer on the convex portion of the uneven base material is protected by the activated carbon fixing coating material coating layer, it is possible to prevent the activated carbon from falling off during transportation or construction. In addition, the VOC gas in the room can be adsorbed by the activated carbon in the concave portion without the coating material coating layer for fixing activated carbon to sufficiently exhibit the adsorption performance.

According to the second aspect of the present invention, the activated carbon is embedded in the pores of the convex portion of the uneven base material to prevent the activated carbon from falling off. It is possible to use low paint, and to apply a small amount,
It is possible to effectively prevent the activated carbon from falling off without lowering the adsorptivity of the activated carbon on the convex portion.

According to the third aspect of the present invention, the activated carbon fixing coating material can be surely coated only on the convex portions of the concave-convex base material by roll coating. In addition, the activated carbon can be surely embedded in the pores of the convex portion by roll roll overnight.

[Brief description of drawings]

1A and 1B show manufacturing steps of a method for manufacturing an interior building board according to an embodiment (example) of the present invention, wherein (a) is a sectional view of an uneven substrate and (b) is activated carbon over the entire surface of the uneven substrate. FIG. 3C is a cross-sectional view of a state in which the containing coating material coating layer is formed, and FIG. 7C is a cross-sectional view of a state in which the active fixing coating material coating layer is formed only on the convex portions of the uneven base material.

FIG. 2 is a cross-sectional view of an interior building board of Comparative Example 1.

FIG. 3 is a cross-sectional view of an interior building board of Comparative Example 2.

FIG. 4 is a cross-sectional view of an interior building board of Comparative Example 3.

FIG. 5 is data of a toluene gas adsorption test.

[Explanation of symbols] 1 uneven base material 1a recess 1b convex part 2 Coating layer containing activated carbon 3 activated carbon 4 Activated carbon fixing coating material coating layer A Interior building board

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kazuhiko Mitsui             1 Ina, Inami-cho, Tonami-gun, Toyama Prefecture             Ken Kogyo Co., Ltd. (72) Inventor Nobuo Kawabe             1 Ina, Inami-cho, Tonami-gun, Toyama Prefecture             Ken Kogyo Co., Ltd. F-term (reference) 2E110 AA48 AA64 AB03 AB23 BA02                       BA12 BB04 BB22 GA23W                       GA33X GA43W GB16X GB23X                       GB35W GB62X                 4F100 AA08 AA37A AB02 AK21                       AT00B BA02 DD01B DE01A                       DG11 DJ10B EH46 EH462                       EH61 EH612 GB08 JD14                       JK09 JM02A YY00A

Claims (3)

[Claims] 1. An activated carbon-containing coating material coating layer comprising a coating layer of a gas-permeable coating material containing activated carbon having a particle diameter of 300 μm or less,
An interior building board characterized in that it is formed on the entire surface of a concave-convex base material having concave and convex parts formed on its surface, and an activated carbon fixing coating material coating layer is formed only on the convex part of the concave-convex base material. . 2. The interior building board according to claim 1, wherein the uneven base material is made of a porous material having a large number of pores, and activated carbon is embedded in the pores of the convex portion of the uneven base material. An interior building board characterized by being. 3. A gas-permeable coating material containing activated carbon having a particle diameter of 300 μm or less is applied to the entire surface of an uneven base material made of a porous base material having a large number of pores and having concave and convex portions formed on the surface. To form an activated carbon-containing coating material coating layer, and then, while pressing the uneven base material with a roll coater, apply the activated carbon fixing coating material only to the convex portions to form the activated carbon fixing coating material coating layer. At the same time, the activated carbon is embedded in the pores of the convex portion of the irregular base material, and a method for manufacturing an interior building board.