JP2003261831A - Interior coating composition and interior board using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an interior coating composition which can be applied to interior materials or ceiling materials of an architectural structure, and excels in moisture absorbing and releasing properties and sound absorbing qualities, and an interior board using the same. <P>SOLUTION: The interior coating composition is basically constituted of (A) a synthetic resin emulsion, (B) moisture absorbing and releasing polymeric particles having a coefficient of moisture absorption at a relative humidity of 45% of ≥5 wt.%, (C) an inorganic lightweight aggregate having an average particle diameter of ≥30 μm, and as the solids content ratio of each component, based on 100 pts.wt. component (A), component (B) is set at 1-100 pts.wt. and component (C) is set at 50-300 pts.wt. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interior coating composition used as an interior material or ceiling material for buildings and an interior board using the same.

[0002]

2. Description of the Related Art In recent years, with increasing interest in comfortable living spaces, interior materials have a moisture absorbing / releasing material having a function of preventing dew condensation on the inner wall surface, a function of preventing mold formation, or a function of suppressing discomfort by adjusting humidity. In addition, expectations for sound absorbing materials and the like having a function of suppressing discomfort such as noise are increasing.

As a material having moisture absorbing / releasing property and sound absorbing property,
Gypsum board is commonly used. However, gypsum board is less hygroscopic than hygroscopic, so when it is installed in a building with high airtightness and high heat insulation in recent years, the humidity generated in the room accumulates in the board for a long time and the moisture in the board Due to the presence of the above, the sound absorbing property is remarkably reduced, and further, dew condensation occurs due to a temperature difference between indoors and outdoors, resulting in the generation of molds and mites harmful to the body, and the aesthetic appearance is significantly impaired.
In order to restore the aesthetic appearance of the surface of the gypsum board that is soiled by mold, etc., it may be refurbished with paint or the like, but in this case, since the surface of the gypsum board is covered with a coating film, the air permeability is lost and the moisture absorption and desorption properties of the gypsum board are lost. May be lost. In addition, the moisture inside the board, which has lost the air permeability, loses the escape area and the porous surface of the gypsum board is covered with the coating film, so that the sound absorbing property may be lost.

As a method for solving the above problem, for example,
Patent Document 1 discloses a coating material containing a synthetic resin emulsion having a specific particle diameter and diatomaceous earth as essential components, and there is a method of exhibiting a moisture absorption / release performance by containing a high proportion of diatomaceous earth. Further, Patent Document 2 discloses a coating material containing a synthetic resin emulsion, diatomaceous earth, and a highly water-absorbing polymer, and there is a method of exhibiting moisture absorption / release properties by containing a high ratio of diatomaceous earth and a highly water-absorbing polymer.

[0005]

[Patent Document 1] Japanese Patent Publication No. 62-15108

[Patent Document 2] Japanese Patent Laid-Open No. 62-74966

[0006] However, the paint using diatomaceous earth as in the above-mentioned prior art has moisture absorbing / releasing performance as compared with general-purpose paint,
The moisture absorbing / releasing performance superior to that of gypsum board was not obtained.
Moreover, the sound absorption performance was not superior to that of gypsum board.

[Problems to be Solved by the Invention]

The present invention has been made in view of the above points, and is applicable to an interior material or a ceiling material of a building, which is excellent in moisture absorption / desorption and sound absorption, and a use thereof. This is to provide the interior board.

[0008]

[Means for Solving the Problems]

That is, the present invention has the following features. 1. (A) synthetic resin emulsion, (B) temperature 20 ° C.,
Moisture-absorbing and desorbing polymer particles having a moisture absorption rate of 5% by weight or more at a relative humidity of 45%, and (C) an inorganic lightweight aggregate having an average particle size of 30 μm or more are basic components, and the solid content ratio of each component is (A) component. 1 to 100 of the component (B) with respect to 100 parts by weight.
An interior coating composition, characterized in that it is 50 to 300 parts by weight of component (C). 2. (A) is a reactive functional group-containing synthetic resin emulsion, and (B) is a reactive functional group-containing hygroscopic polymer particle having a moisture absorption rate of 5% by weight or more at a temperature of 20 ° C. and a relative humidity of 45%. , (D) containing a cross-linking agent having a functional group capable of reacting with the reactive functional groups of the components (A) and (B),
The solid content ratio of the component (D) is 0.05 to 15 parts by weight with respect to 100 parts by weight of the component (A).
The interior coating composition as described in 1. 3.1. Or 2. An interior board, wherein a coating film formed from the interior coating composition according to 1. is laminated on a substrate. 4. 2. The base material is one selected from gypsum board, slate board and calcium silicate board. Interior board described in. 5. 2. The base material has a plurality of through holes. Or 4. Interior board described in.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below along with its embodiments.

The synthetic resin emulsion (A) of the present invention (hereinafter referred to as "component (A)") comprises (B) hygroscopic polymer particles (hereinafter referred to as "component (B)") and (C). ) An inorganic lightweight aggregate (hereinafter referred to as "component (C)") is bonded.

Examples of synthetic resin emulsions include:
One or two kinds of acrylic resin emulsion, silicone resin emulsion, fluororesin emulsion, acrylic silicone resin emulsion, vinyl acetate resin emulsion, vinyl chloride resin emulsion, urethane resin emulsion, epoxy resin emulsion, polyvinyl alcohol resin emulsion, ethylene resin emulsion, etc. The above can be mixed and used.

Further, the glass transition temperature (T) of the component (A)
g) is preferably −20 to 5 ° C. When Tg is in such a range, it is possible to form a film without using a film-forming auxiliary which is one of volatile organic compounds (VOC), which is preferable.

Particularly, the component (A) is preferably a reactive functional group-containing synthetic resin emulsion. As the reactive functional group, a crosslinking agent described below (hereinafter referred to as "D component").
Any of those capable of reacting with the functional group of can be used.

As a combination of such functional groups,
For example, carboxyl group and metal ion, carboxyl group and carbodiimide group, carboxyl group and epoxy group, carboxyl group and aziridine group, carboxyl group and oxazoline group, hydroxyl group and isocyanate group, carbonyl group and hydrazide group, epoxy group and amino group, etc. Can be given. In the present invention, a carboxyl group is particularly preferably used as the reactive functional group of the component (A). The carboxyl group-containing synthetic resin emulsion is obtained by copolymerizing a monomer having a carboxyl group (hereinafter referred to as “a component”).

Examples of the component (a) include ethylenically unsaturated carboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, itaconic acid and fumaric acid, and their ammonium salts, organic amine salts and alkalis. Examples include metal salts. These may be used alone or in admixture of two or more.

The component (A) generally contains the component (a) in an amount of 0.1 to 40% by weight, preferably 0.5 to 20% by weight, based on the total weight of the monomers. If the amount of component (a) is more than 40% by weight, the water resistance and adhesiveness of the film will also deteriorate.
When the amount of the component (a) is less than 0.1% by weight, a tough film cannot be formed and the water resistance and moisture resistance deteriorate.

In the component (A), examples of the monomer copolymerizable with the component (a) include methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate and 2-ethylhexyl ( (Meth) acrylates such as (meth) acrylate, cyclohexyl (meth) acrylate, phenyl (meth) acrylate, benzyl (meth) acrylate; aromatic vinyls such as styrene, 2-methylstyrene, vinyltoluene, divinylbenzene; acrylamide , Methacrylamide,
Maleic acid amide, N-methylol acrylamide, N
Amides such as methylol methacrylamide, diacetone acrylamide; (meth) acrylic acid esters such as 2-hydroxyethyl (meth) acrylate and hydroxypropyl (meth) acrylate; vinyl esters such as vinyl acetate and vinyl propionate; Vinylidene chloride,
Vinylidene halides such as vinylidene fluoride; ethylene, propylene, isoprene, butadiene, vinylpyrrolidone, (meth) acrylonitrile, vinyl chloride and the like. Further, epoxy derivatives such as glycidyl acrylate, glycidyl methacrylate and allyl glycidyl ether can be used.

The component (D) of the present invention is a crosslinking agent having a functional group capable of reacting with the reactive functional groups of the component (A) and the component (B) described later. In the composition of the present invention, (D)
By containing the components, the strength of the coating film is improved, and further excellent moisture absorption / release properties can be exhibited. The component (D) preferably contains two or more of these functional groups in one molecule. The form of the component (D) may be either emulsion type or water-soluble type. The functional group of the component (D) is not limited as long as it can react with the component (A) and the component (B), but in the present invention, a carbodiimide group which is a functional group capable of reacting with a carboxyl group and an epoxy group are particularly preferable. A group, an aziridine group, an oxazoline group and the like are preferably used.

Specific examples of the component (D) include, for example, a crosslinking agent containing a carbodiimide group, which is disclosed in JP-A-10-60.
No. 272, JP-A-10-316930, JP-A-11-60667, etc., etc. As a crosslinking agent containing an epoxy group, polyethylene glycol diglycidyl ether, polyhydroxyalkane polyglycidyl ether, diglycerol poly Glycidyl ether,
As a cross-linking agent containing an aziridine group such as sorbitol polyglycidyl ether, 2,2-bishydroxymethylbutanol-tris [3- (1-aziridinyl) propionate], 1,6-hexamethylenediethylene urea,
As a crosslinking agent containing an oxazoline group, such as diphenylmethane-bis-4,4′-N, N′-diethyleneurea, 2
-A polymerizable oxazoline compound such as vinyl-2-oxazoline, 2-vinyl-4-methyl-2-oxazoline, 2-vinyl-5-methyl-2-oxazoline, 2-isopropenyl-2-oxazoline is used together with the compound. Examples thereof include resins copolymerized with a polymerizable monomer.

The compounding amount of the component (D) is 0.05 to 15 parts by weight, preferably 0.1 to 5 parts by weight, based on 100 parts by weight of the component (A) in terms of solid content. If the amount is less than 0.05 part by weight, the coating film strength and moisture absorption / release property tend to be poor. If it exceeds 15 parts by weight, the improvement in physical properties commensurate with the cost increase cannot be expected.

The component (B) of the present invention has a moisture absorption rate of 5% by weight or more, preferably 1 at a temperature of 20 ° C. and a relative humidity of 45%.
It is 0% or more of moisture absorbing / releasing polymer particles, and is a component that imparts moisture absorbing / releasing performance to the composition of the present invention.

The moisture absorption rate at a temperature of 20 ° C. and a relative humidity of 45% means that the sample is dried at 50 ° C. for 72 hours and then absorbed in a constant temperature and humidity chamber at a temperature of 20 ° C. and a humidity of 45% for 24 hours. It is a value obtained from the change in weight. That is, moisture absorption rate (wt%) = {(weight after moisture absorption−weight after drying) /
Weight after drying} × 100.

The component (B) of the present invention is not particularly limited as long as it has a moisture absorption rate of 5% by weight or more at a temperature of 20 ° C. and a relative humidity of 45%, but it is a hygroscopic polymer particle containing a reactive functional group. Is preferred. As the reactive functional group,
Those capable of reacting with the functional group of the component (D) can be used,
A functional group similar to the reactive functional group of the component (A) can be used. In the present invention, it is desirable to contain a carboxyl group as a reactive functional group from the viewpoint of improving coating film strength and moisture absorption / release.

The method of introducing a carboxyl group into the component (B) is not particularly limited, but for example, a method of homopolymerization of a monomer having a carboxyl group or copolymerization with another copolymerizable monomer. , A method of subjecting a copolymer of a cyano group-containing monomer such as (meth) acrylonitrile and another monomer to hydrolysis treatment, a method of oxidizing an alkene, an alkyl halide, an alcohol or an aldehyde, and the like. To be The carboxyl group content of the component (B) is
It is preferably 1 mmol / g or more.

Further, the component (B) preferably has a cross-linked structure from the viewpoint of improving moisture absorption and desorption. Such a crosslinked structure can be formed by a method of introducing a crosslinkable monomer in the polymerization step, introducing a crosslinkable compound after the polymerization, or the like. As the crosslinkable monomer, divinylbenzene, ethylene glycol di (meth) acrylate, methylenebisacrylamide and the like, and as the crosslinkable compound, hydrazine compound and the like can be suitably used.

The particle size of the component (B) is not particularly limited, but those having a particle size of about 0.1 to 100 μm can be used.

The blending amount of the component (B) is 1 to 100 parts by weight, preferably 10 to 60 parts by weight, based on 100 parts by weight of the component (A) in terms of solid content. If it is less than 1 part by weight, the moisture absorption and desorption performance will be insufficient, and if it exceeds 100 parts by weight, water resistance will be adversely affected.

The composition of the present invention can further improve the moisture absorbing / releasing performance by containing the component (C). Further, it is possible to impart a sound absorption coefficient, and in particular, in the present invention, not only the sound absorption effect in the high frequency region but also the frequency of 100
An excellent sound absorbing effect can be obtained even in a low frequency region of 0 Hz or less.

The component (C) of the present invention has an average particle size of 30.
It is not particularly limited as long as it is an inorganic lightweight aggregate of μm or more, for example, foam of natural stone such as obsidian, pearlite, vermiculite, anti-firestone, shirasu, etc., foamed granular material of various ceramics such as glass and fly ash, pumice stone, One kind or a mixture of two or more kinds of lightweight granular materials such as hollow balloons can be used. Of these, in particular, natural stone foams and foam granules can be preferably used.

The average particle size of the component (C) of the present invention is 30 μm.
m or more can be used, but preferably 50 to 200
The thickness is 0 μm, more preferably 100 to 1000 μm. When the average particle size is 30 μm or more, the moisture absorbing / releasing performance and the sound absorbing performance (especially the sound absorbing performance in the low frequency region) are sufficiently exhibited. If the average particle size is less than 30 μm, the air permeability of the coating film is impaired, and the moisture absorption / release property may be poor.

The bulk specific gravity of the component (C) of the present invention is not particularly limited, but preferably 0.02 to 0.6 g.
/ Cm ³ , more preferably 0.05 to 0.5 g / cm
Use the one of ³ .

The amount of the component (C) blended is 50 to 300 parts by weight based on 100 parts by weight of the component (A) in terms of solid content.
It is preferably 100 to 200 parts by weight. If the amount is less than 50 parts by weight, the moisture absorption / release property tends to be poor. Also,
If it exceeds 300 parts by weight, workability during construction is reduced.

The composition of the present invention preferably contains a filler in addition to the above components. Examples of the filler include calcium carbonate, magnesium carbonate, zinc oxide, titanium oxide, aluminum hydroxide, magnesium hydroxide, barium sulfate, silica, alumina, talc, potassium titanate, and the like. In particular, when aluminum hydroxide is contained, it is possible to impart flame retardancy and crack resistance to a dry coating film, which is preferable.

The filler is preferably added in an amount of 50 to 300 parts by weight based on 100 parts by weight of the resin solid content.

Further, in the present invention, it is preferable to contain a porous powder in addition to the above-mentioned components, so that the moisture absorbing / releasing property and the sound absorbing performance can be further improved. Examples of such a porous powder include charcoal, bamboo charcoal, sawdust, pulp waste liquid, palm shell, coal, coke, petroleum pitch, and other carbides,
Examples thereof include clay minerals such as allophane, zeolite, and sepiolite, and porous powder such as diatomaceous earth. In particular, bamboo charcoal granules and allophane can be preferably used. In the present invention, bamboo charcoal can be preferably used. Bamboo charcoal is usually from 300 to 1000 ° C. and is made from bamboo of various varieties such as Moso bamboo, Madake, Hachiku and Nemagaritake.
It is obtained by carbonizing in, extinguishing and cooling. By using such bamboo charcoal, more excellent sound absorption characteristics can be obtained, and it is extremely effective for thinning the sound absorbing plate.

In the present invention, in addition to the above components, various organic and inorganic fibers can be contained. As the organic fiber, for example, polyamide fiber, polyvinyl alcohol fiber, polyester fiber, polyacrylonitrile fiber, polyvinyl chloride fiber, polypropylene fiber, polyethylene fiber, polyurethane fiber,
Examples thereof include polyvinylidene chloride fiber, aramid fiber, vinylon fiber, carbon fiber, pulp fiber and the like. As the inorganic fiber, for example, glass fiber, slag fiber,
Examples include rock wool, silica-alumina fiber, aluminum fiber, stainless fiber and the like. By containing such fibers, the strength of the formed coating film can be further increased. A fiber having a length of 0.1 to 10 mm, preferably 0.5 to 5 mm can be used.

In addition, various additives usually added to paints such as pigments, aggregates, thickeners, plasticizers, dispersants, preservatives, antifungal agents, antialgae agents, antifreezing agents, etc. You may mix | blend as long as the effect of invention is not impaired.

The interior coating composition thus obtained can be applied to a substrate and used as an interior board for building interior materials, ceiling materials and the like.

The base material is not particularly limited, but gypsum board, slate board, calcium silicate board, dry board such as extruded board, wood board such as veneer board, metal board such as aluminum board and stainless board is used. can do. When mainly used for the inner wall surface or ceiling surface of a building, gypsum board, slate board, calcium silicate board and the like can be preferably used.

The thickness of the base material is preferably in the range of 1 to 30 mm, and more preferably 5 to 15 mm, considering the strength of the entire interior board and damage due to impact.
In particular, if the thickness is 30 mm or more, the weight of the board itself becomes large, which makes it difficult to convey the board, and the workability at the time of mounting and construction may be deteriorated.

The base material preferably has a plurality of through holes. The diameter of the through hole is not particularly limited, but is preferably in the range of 3 to 20 mm, preferably 3 to 15 mm. Further, it is preferable that the area where the holes are opened is provided in a range of 5 to 70%, preferably 10 to 30% with respect to the surface of the base material. If the pore size is less than 3 mm and the opening area is less than 5%, the sound absorption will decrease,
If the hole diameter is larger than 20 mm, the opening area is 70%
If it is larger than the above range, the strength of the board decreases, which is not preferable.

The coating method is not particularly limited,
There is a method of directly applying the interior coating material of the present invention to a substrate.
At this time, if necessary, the base material may be subjected to some undercoating treatment to such an extent that the effect of the present invention is not impaired.

As a coating method, spray coating, roller coating, brush coating, iron coating or the like can be used without particular limitation. Particularly, in the present invention, the viscosity of the paint is 15 Pa · s to 4
By adjusting the pressure to 5 Pa · s, the roller coating can be applied more smoothly to the interior material or ceiling material of the building. In addition, it is also possible to coat by a known method such as spray coating, roll coater, flow coater, etc. at a manufacturing factory of boards and the like. The coating amount is preferably 0.5 to 3.0 kg / m ² .

Further, after applying the interior coating material of the present invention,
The top coating material may be applied to the extent that the effects of the present invention are not impaired. The top coating material is not particularly limited, and examples thereof include acrylic resin, silicone resin, fluororesin, acrylic silicone resin, vinyl acetate resin, vinyl chloride resin, urethane resin, epoxy resin, polyvinyl alcohol resin, ethylene resin, and the like. Of these, one kind or a combination of two or more kinds can be used. In the present invention, the top coating material containing a silicone resin is preferable because it has excellent moisture absorption and desorption properties and weather resistance.

When installing the interior board of the present invention,
Various methods can be adopted, such as a method of directly adhering to a rigid body such as concrete or wood so that the coating surface is on the indoor side, a method of providing an air layer between the rigid body and the installation, and the like.

[0047]

EXAMPLES Examples and comparative examples will be shown below to further clarify the characteristics of the present invention.

A coating material was prepared by using the raw materials shown in Table 1 and the composition shown in Table 2.

[0049]

[Table 1]

[0050]

[Table 2]

(Preparation of Specimen) (Examples 1 to 6, Comparative Examples 1 to 9) A 150 × 150 mm gypsum board (board thickness: 9.5 mm) was applied to an SK aqueous white sealer (acrylic resin-based undercoat material; SK Kaken Co., Ltd.). After being dried for 8 hours at a temperature of 23 ° C. and a relative humidity of 50% (hereinafter referred to as “standard condition”), the prepared coating material is roller coated at 1.0 kg / m ² for 14 days in standard condition. It was dried and cured to prepare a test body. (Example 7) Gypsum board having a plurality of through holes of 150 x 150 mm (hole diameter 13.4 mm, hole pitch 24 mm,
An open area of 24% and a plate thickness of 9.5 mm was dried with an SK water-based white sealer (acrylic resin-based undercoat material; manufactured by SK Kaken Co., Ltd.) for 8 hours in a standard state, and then 1.0 kg of the prepared coating material was applied. / M ² roller installation, 1 in standard condition
A test body was prepared by drying and curing for 4 days.

(Test method) (1) Moisture absorption and desorption test Weight of the prepared test piece W_D0After measuring the
Weight W after standing for 24 hours at 0 ℃ and 90% relative humidity_W1To
Measured and then 24 at a temperature of 20 ° C and a relative humidity of 45%
Let stand for a time and weigh W_D2Was measured. Do the same operation another 1
Repeated times, weight W in wet state_W2And dry weight W
_D2And were measured. Using the obtained value, the steam is calculated by the following formula.
The adsorption / desorption characteristic value was calculated. Moisture absorption W₁(G) = W_W1-W_D0 Moisture absorption W_Two(G) = W_W1-W_D1 Moisture absorption W_Three(G) = W_W2-W_D1 Moisture absorption W_Four(G) = W_W2-W_D2 Moisture absorption and desorption characteristic value (g / m^Two) = (W₁＋ W_Two＋ W_Three＋ W_Four) /
{4 × (area of test body)}. Evaluation is ◎: 50 g / m^TwoAbove, ◯: 40 to 50 g / m
^Two, Δ: 30 to 40 g / m^Two, ×: 30 g / m^TwoLess than,
And the results are shown in Table 3. In addition, it measures only with gypsum board
Moisture absorption and desorption characteristic value was 19.2 g / m^TwoMet.

[0053]

[Table 3]

(2) Sound absorption coefficient The prepared test piece was subjected to the two-microphone method of ASTM E1050, and the normal incidence sound absorption coefficient was measured in the frequency range of 50 to 1500 Hz. As the test device, a two-microphone impedance measuring tube type 4206 (manufactured by Buruel Care Co.) was used. The sound absorption coefficient was measured for each test body when a back air layer of 100 mm was provided. The results are shown in FIGS. The sound absorption coefficient measured only with the gypsum board is shown in FIG. 17, and the sound absorption coefficient measured only with the gypsum board having a plurality of through holes is shown in FIG.

Example 1 A coating composition of the present invention,
It showed excellent moisture absorption and desorption performance. Also, as shown in FIG.
The sound absorption coefficient was high in the low frequency region.

(Example 2) A coating composition of the present invention,
It showed excellent moisture absorption and desorption performance. Also, as shown in FIG.
It showed a high sound absorption coefficient in the low frequency region.

(Example 3) A coating composition of the present invention,
It showed excellent moisture absorption and desorption performance. Also, as shown in FIG.
It showed a high sound absorption coefficient in the low frequency region.

Example 4 A coating composition of the present invention,
It showed excellent moisture absorption and desorption performance. Also, as shown in FIG.
It showed a high sound absorption coefficient in the low frequency region.

Example 5 A coating composition of the present invention,
It showed excellent moisture absorption and desorption performance. Also, as shown in FIG.
It showed a high sound absorption coefficient in the low frequency region.

Example 6 A coating composition of the present invention,
It showed excellent moisture absorption and desorption performance. Also, as shown in FIG.
It showed a high sound absorption coefficient in the low frequency region.

Example 7 A coating composition of the present invention,
It showed excellent moisture absorption and desorption performance. Also, as shown in FIG.
The sound absorption coefficient was high in the low frequency region.

(Comparative Example 1) Since the moisture absorbing / releasing polymer particles and the inorganic lightweight aggregate were not contained, the moisture absorbing / releasing property was low. Further, as shown in FIG. 8, the sound absorption coefficient was low in the low frequency region.

Comparative Example 2 The moisture absorptive and desorptive property was low because it did not contain the moisture absorptive and desorptive polymer particles and the inorganic lightweight aggregate. Further, as shown in FIG. 9, the sound absorption coefficient was low in the low frequency region.

Comparative Example 3 Since the inorganic lightweight aggregate was not contained, the result was inferior in moisture absorption and desorption. In addition, FIG.
As shown in, the sound absorption coefficient was low in the low frequency region.

(Comparative Example 4) Since the diatomaceous earth which does not contain the inorganic lightweight aggregate and whose moisture absorption rate is smaller than that of the present invention is used, the moisture absorption / desorption property is low. Also,
As shown in FIG. 11, the sound absorption coefficient was low in the low frequency region.

(Comparative Example 5) Since the moisture absorptive and desorptive polymer particles were not contained, the moisture absorptive and desorptive property was low as shown in FIG.

(Comparative Example 6) The moisture absorptive and desorptive property was low because the moisture absorptive and desorptive polymer particles were not contained and the particle diameter of the inorganic lightweight aggregate was smaller than that of the present invention. Further, as shown in FIG. 13, the sound absorption coefficient was low in the low frequency region.

(Comparative Example 7) Since the particle size of the inorganic lightweight aggregate was smaller than that of the present invention, the result was inferior in moisture absorption and desorption. Further, as shown in FIG. 14, the sound absorption coefficient was low in the low frequency region.

(Comparative Example 8) Since diatomaceous earth having a moisture absorption rate lower than that of the present invention is used, as shown in FIG.
Moisture absorption and desorption was low.

(Comparative Example 9) Since diatomaceous earth having a moisture absorption rate smaller than that of the present invention was used and the particle diameter of the inorganic lightweight aggregate was smaller than that of the present invention, the moisture absorption / desorption property was low. Further, as shown in FIG. 16, the sound absorption coefficient was low in the low frequency region.

[0071]

EFFECTS OF THE INVENTION According to the present invention, since it has a high water vapor absorption and desorption property, an excellent humidity control property in the room, and an excellent sound absorption performance in a low frequency region, it can prevent dew condensation and suppress the intrusion of noise. A great effect can be obtained for improvement.

[0072]

[Brief description of drawings]

FIG. 1 is a graph showing the results of normal incidence sound absorption coefficient of Example 1 of the present invention.

FIG. 2 is a graph showing the results of normal incident sound absorption coefficient of Example 2 of the present invention.

FIG. 3 is a graph showing the results of normal incidence sound absorption coefficient of Example 3 of the present invention.

FIG. 4 is a graph showing the results of normal incidence sound absorption coefficient of Example 4 of the present invention.

FIG. 5 is a graph showing the results of normal incidence sound absorption coefficient of Example 5 of the present invention.

FIG. 6 is a graph showing the results of normal incidence sound absorption coefficient of Example 6 of the present invention.

FIG. 7 is a graph showing the results of normal incident sound absorption coefficient of Example 7 of the present invention.

FIG. 8 is a graph showing the results of normal incidence sound absorption coefficient of Comparative Example 1 of the present invention.

FIG. 9 is a graph showing the results of the normal incidence sound absorption coefficient of Comparative Example 2 of the present invention.

FIG. 10 is a graph showing the results of normal incident sound absorption coefficient of Comparative Example 3 of the present invention.

FIG. 11 is a graph showing the results of normal incident sound absorption coefficient of Comparative Example 4 of the present invention.

FIG. 12 is a graph showing the results of normal incidence sound absorption coefficient of Comparative Example 5 of the present invention.

FIG. 13 is a graph showing the results of normal incident sound absorption coefficient of Comparative Example 6 of the present invention.

FIG. 14 is a graph showing the results of normal incidence sound absorption coefficient of Comparative Example 7 of the present invention.

FIG. 15 is a graph showing the results of normal incidence sound absorption coefficient of Comparative Example 8 of the present invention.

16 is a graph showing the results of normal incident sound absorption coefficient of Comparative Example 9 of the present invention. FIG.

FIG. 17 is a graph showing the results of normal incidence sound absorption coefficient of only gypsum board.

FIG. 18 is a graph showing the results of normal incidence sound absorption coefficient of only a gypsum board having a plurality of through holes.

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Claims (5)

[Claims] 1. (A) Synthetic resin emulsion, (B) Moisture-absorbing and desorbing polymer particles having a moisture absorption rate of 5% by weight or more at a temperature of 20 ° C. and a relative humidity of 45%, and (C) an inorganic lightweight having an average particle size of 30 μm or more. Aggregate is the basic composition, and the solid content ratio of each component is 100 parts by weight of the component (A), and the component (B) is 1 to 1.
00 parts by weight, 50 to 300 parts by weight of component (C), an interior coating composition. 2. (A) is a reactive functional group-containing synthetic resin emulsion, and (B) is a reactive functional group-containing hygroscopic polymer having a moisture absorption rate of 5% by weight or more at a temperature of 20 ° C. and a relative humidity of 45%. The particles are cross-linking agents having a functional group capable of reacting with the reactive functional groups of the components (D), (A) and (B), and the solid content ratio of the component (D) is 100 as the component (A). The interior coating composition according to claim 1, which is 0.05 to 15 parts by weight with respect to parts by weight. 3. An interior board, wherein a coating film formed from the interior coating composition according to claim 1 or 2 is laminated on a base material. 4. The interior board according to claim 3, wherein the base material is one selected from gypsum board, slate board and calcium silicate board. 5. The interior board according to claim 3, wherein the base material has a plurality of through holes.