JP4597497B2 - Architectural paint composition - Google Patents

Description

  The present invention relates to a building paint composition. The paint composition of the present invention can be suitably used particularly as a paint for interior finishing of buildings.

In recent years, in the indoor environment of buildings, generation of mold due to dew condensation, sick house due to volatile organic compounds, and the like have been taken up as social problems.
On the other hand, various coating compositions and coating methods aimed at improving the indoor environment have been proposed.
For example, Japanese Patent Application Laid-Open No. 61-141967 (Patent Document 1) discloses a method of forming a moisture-permeable coating film in order to prevent corrosion, mold generation, and the like due to condensation on the wall surface. .
Japanese Laid-Open Patent Publication No. 62-74966 (Patent Document 2) discloses a humidity control paint having a function of reducing humidity fluctuations in a room. The paint described in Patent Document 2 has a synthetic resin emulsion, diatomaceous earth, a water-absorbing polymer, and the like as main components and a pigment volume concentration adjusted to 55% or more.
JP-A-2002-138252 (Patent Document 3) includes calcined diatomaceous earth powder, resin emulsion, and natural plant essential oil as paints that provide effects such as condensation prevention, mold prevention, deodorization, and removal of chemical substances. Are disclosed.
JP-A-2000-169757 (Patent Document 4) discloses a coating composition having an adsorption ability such as acetaldehyde or formaldehyde which is a causative substance of sick house. The coating composition of patent document 4 uses an aggregate, an adhesive agent, and an aldehyde chemical adsorption agent as a structural component.
In the paints as exemplified above, the pigment volume concentration is set high in order to obtain sufficient performance in moisture permeability, moisture absorption / release properties (humidity control), chemical substance adsorption, and the like. In other words, the coating film is designed to be made porous by a large amount of powder components so that moisture and chemical substances can reach the inside of the coating film.

JP 61-141967 A JP-A-62-74966 JP 2002-138252 A JP 2000-169757 A

Increasing the pigment volume concentration in the paint as described above is an effective means for improving performance such as moisture permeability, moisture absorption / release properties, and chemical substance adsorption. However, practical problems arise.
The first problem is that once the dirt adheres, it becomes difficult to remove. On the interior surface of a building, dirt such as hand dust is daily, but if the dirt can be wiped off, the original aesthetics can be restored. However, in a paint having a high pigment volume concentration, dirt components such as hand stains enter the fine uneven portions of the coating film, and it is easy to fall into a state where wiping is difficult.
The second problem is the occurrence of cracks in the formed coating film. When the pigment volume concentration is increased, the ratio of the binder is relatively decreased, and thus the coating film is easily cracked. In particular, in a thick film type coating material, variations in coating conditions and coating environment may greatly affect the formation of the coating film, and the problem of coating film cracking is likely to occur.

  The present invention has been made in view of the above problems, and an object thereof is to improve soil removability and crack prevention in a paint having functionality such as moisture permeability, moisture absorption / release properties, and chemical substance adsorptivity. .

  As a result of intensive studies to achieve the above object, the present inventor has found that a plurality of fillers having a specific shape and particle size are used as fillers in paints having functions such as moisture permeability, moisture absorption / release properties, and chemical substance adsorption properties. The inventors have conceived that these particles are used in combination, and have completed the present invention.

That is, the present invention has the following characteristics.
1. The coating composition has at least one performance selected from moisture permeability, moisture absorption / release properties, and chemical substance adsorptivity,
Binder (a), spherical particles (b) having an average particle diameter of 5 to 200 μm, non-spherical particles (c) having an average particle diameter of 1 to 100 μm and having an average particle diameter smaller than that of the spherical particles, The volume ratio of the component (b) and the component (c) is 1:99 to 90:10, and the total amount of the component (b) and the component (c) is 100 with respect to 100 parts by volume of the resin solid content of the component (a). A coating composition for buildings characterized by being -2000 parts by volume.
2. The ratio of the average particle size of the component (b) to the average particle size of the component (c) is 100: 1 to 100: 80. The coating composition for buildings as described.
3. (C) As a component, the granular material which has the adsorption | suction ability of a water | moisture content and / or a chemical substance is included. ~ 2. The coating composition for buildings according to any one of the above.

In the coating composition of this invention, the coating film excellent in stain | pollution | contamination removal property is obtained. Even if dirt such as hand dust adheres, it can be easily removed by wiping or the like, and the original aesthetics can be maintained. Furthermore, the coating composition of the present invention can also prevent cracking of the coating film.
ADVANTAGE OF THE INVENTION According to this invention, the problem in the coating material which has functions, such as moisture permeability, moisture absorption / release property, and a chemical substance adsorption property, is improved, and the coating material provided with practical physical property can be provided.

  The present invention relates to a coating composition in which a formed coating film has at least one performance selected from moisture permeability, moisture absorption / release properties, and chemical substance adsorption. In particular, the present invention can provide advantageous effects in a coating composition having moisture absorption / release properties and / or chemical substance adsorption properties. The degree of the effect of each performance is not particularly limited, but it is generally desirable to have the physical properties described below.

(1) Moisture permeability According to JIS K5400: 1990 “General paint test method” 8.17, water vapor permeability is 20 g / m ² · 24 h or more, preferably 40 g / m ² · 24 h or more, more preferably 50 g / m ² · 24 h. more than.

(2) Moisture absorption / release property The moisture absorption / release amount according to JIS A6909: 2003 “finishing coating material for building” 7.32 is 20 g / m ² or more, preferably 50 g / m ² or more, more preferably 70 g / m ² or more.

(3) Chemical substance adsorptivity The formaldehyde adsorption rate by the following test is 80% or more, preferably 90% or more, more preferably 95% or more.
・ Test method Put the test body in a 3L odor bag, inject formaldehyde gas into it to a concentration of 100ppm, and detect the residual gas concentration after standing for 24 hours in standard condition (temperature 23 ℃, humidity 50%). Measure with a tube. The adsorption rate is calculated from the residual gas concentration and the initial gas concentration (the following formula). In addition, as a test body, after apply | coating a coating material with the predetermined thickness to a 150x70x0.8 mm aluminum plate, what was cured for 14 days in the standard state is used.
<Formula> Adsorption rate (%) = {(A−B) / A} × 100
(In the formula, A represents the initial gas concentration, and B represents the residual gas concentration after being left for 24 hours.)

  The coating composition of the present invention has the performance as described above. As essential components, the binder (a), true spherical particles (b) having an average particle diameter of 5 to 200 μm, and an average particle diameter of 1 are used. It contains non-spherical particles (c) having an average particle diameter of ˜100 μm and smaller than the true spherical particles.

  As the binder (a), various binders such as water-soluble resins, water-dispersible resins, solvent-soluble resins, solvent-free resins, non-water-dispersed resins, powder resins, or binders obtained by combining these Etc. can be used. The form of such a binder is not particularly limited, and may be either one liquid type or two liquid type. In the present invention, a water-soluble resin and / or a water-dispersible resin is particularly preferably used. Examples of usable resins include cellulose, polyvinyl alcohol, ethylene resin, vinyl acetate resin, polyester resin, alkyd resin, vinyl chloride resin, epoxy resin, acrylic resin, urethane resin, silicone resin, fluorine resin, and the like. These composite systems can be mentioned. Such a binder (a) may be capable of adsorbing moisture and chemical substances.

  The glass transition temperature of the binder (a) can be appropriately set. However, when a water-dispersible resin is used as the binder (a), it is −50 to 5 ° C. (preferably −40 to 0 ° C., more It is desirable to set it to −35 to −5 ° C. If such a water-dispersible resin having a glass transition temperature is used, the mixing amount of a film-forming aid or the like can be reduced, and a low VOC paint suitable for interior finishing can be obtained. And in this invention, even if it is a case where such a water dispersible resin with a low glass transition temperature is used, sufficient dirt removal property can be exhibited.

  In the composition of the present invention, as a filler, spherical particles having an average particle diameter of 5 to 200 μm (hereinafter also referred to as “component (b)”), an average particle diameter of 1 to 100 μm, and an average particle which is larger than the spherical particles Non-spherical particles having a small diameter (hereinafter also referred to as “component (c)”) are included. In the present invention, by using such a component (b) and a component (c) in combination, it is possible to exhibit soil removability and crack prevention.

As the shape of component (b), the ratio of major axis to minor axis (major axis / minor axis) is 0.8 to 1.2 (preferably 0.9 to 1.1, more preferably 0.95 to 1.05). ) Is preferred. Various materials can be used as the component (b), regardless of whether they are organic or inorganic.
(B) The average particle diameter of a component is 5 micrometers or more and 200 micrometers or less normally, Preferably they are 10 micrometers or more and 150 micrometers or less, More preferably, they are 20 micrometers or more and 100 micrometers or less. If the average particle diameter of (b) component is in such a range, sufficient antifouling property can be exhibited. Moreover, moderate tactile sensation and texture can be obtained in the formed coating film.

  As the component (b) in the present invention, spherical spherical particles (hereinafter also referred to as “component (b-1)”) are particularly suitable. By using true spherical hollow particles as the component (b), it is possible to further improve the soil removability in the formed coating film. Furthermore, it is possible to improve the workability of painting with a trowel or the like and the prevention of condensation. In addition, the weight of the paint or coating film can be reduced.

  The component (b-1) is a closed cell type hollow particle formed of an inorganic or organic outer shell. Examples of (b-1) include inorganic hollow beads and organic hollow beads. Examples of the inorganic component constituting the inorganic hollow beads include sodium silicate glass, aluminum silicate glass, borosilicate soda glass, carbon, and alumina. Examples of organic components constituting the organic hollow beads include acrylic resins, styrene resins, acrylic-styrene copolymer resins, acrylic-acrylonitrile copolymer resins, acrylic-styrene-acrylonitrile copolymer resins, acrylonitrile-methacrylonitrile copolymer resins, Examples thereof include acrylic-acrylonitrile-methacrylonitrile copolymer resins and vinylidene chloride-acrylonitrile copolymer resins. Of these, inorganic hollow beads (particularly hollow glass beads) are preferred in the present invention.

The density of (b-1) component is 0.01-1 g / cm < ³ > normally, Preferably it is 0.1-0.8 g / cm < ³ >, More preferably, it is 0.2-0.6 g / cm < ³ >. When the density is too small, the particle strength becomes insufficient, and there is a risk of breaking during mixing. If the density is too high, the effect of improving the antifouling property is insufficient.

The component (c) is a non-spherical particle having an average particle size of 1 to 100 μm and an average particle size smaller than that of the component (b). As the component (c), known extender pigments and the like can be used as long as these conditions are satisfied.
Examples of the component (c) include heavy calcium carbonate, precipitated calcium carbonate, kaolin, talc, clay, porcelain clay, china clay, barium sulfate, barium carbonate, quartz sand, and quartzite.
In addition, as the component (c), it is also possible to use a granular material having an ability to adsorb moisture and / or chemical substances. Examples of such granular materials include silica gel, zeolite, sodium sulfate, magnesium silicate, alumina, allophane, diatomaceous earth, siliceous shale, sepiolite, attabargite, montmorillonite, zonolite, imogolite, Oya stone powder, activated clay, charcoal, activated carbon Wood powder, bamboo charcoal, cork powder, kenaf powder, frypontite, activated zinc white, porous synthetic resin particles, and the like. Among these, silica gel, allophane, diatomaceous earth and the like are preferable.

The average particle size of the component (c) is usually 1 μm or more and 100 μm or less, preferably 2 μm or more and less than 50 μm, more preferably 3 μm or more and less than 50 μm.
As the component (c), one having an average particle size within the above range and smaller than the average particle size of the component (b) is used. Particularly in the present invention, the ratio of the average particle size of the component (b) to the average particle size of the component (c) is 100: 1 to 100: 80 (preferably 100: 2 to 100: 70, more preferably 100: 5. ~ 100: 60). When the average particle size of the component (c) is too large, it is not possible to obtain an improvement effect in soil removability. On the other hand, when the component (c) is too small, the coating film tends to crack.

  The volume ratio of the component (b) and the component (c) is usually 1:99 to 90:10, preferably 10:90 to 90:10, more preferably 25:75 to 75:25. By using the component (b) and the component (c) together in such a ratio, it is possible to exhibit sufficient soil removability and crack prevention. Moreover, it is suitable also in the point of the tactile sense of a formed coating film, and a texture.

  In the composition of the present invention, the total amount of the component (b) and the component (c) is 50 to 2000 parts by volume (preferably 100 to 1500 parts by volume, more preferably 100 parts by volume of the resin solid content of the component (a). 200-1000 parts by volume). When the mixing ratio of the component (b) and the component (c) is within such a range, performances such as moisture permeability, moisture absorption / release properties, and chemical substance adsorption properties can be sufficiently exhibited. When these mixing ratios are too small, performances such as moisture permeability, moisture absorption / release properties, and chemical substance adsorptivity become insufficient. Moreover, thick coating becomes difficult. On the other hand, when the mixing ratio is too large, the coating film is easily cracked or peeled off.

In the composition of the present invention, an aggregate having an average particle diameter exceeding 0.1 mm can be mixed within a range not impairing the effects of the present invention.
As the aggregate, at least one selected from natural aggregates such as natural stones, pulverized natural stones, and artificial aggregates such as colored aggregates can be used. Specifically, for example, marble, granite, serpentine, granite, fluorite, cryolite, feldspar, quartzite, quartz sand, and pulverized products thereof, ceramic pulverized product, ceramic pulverized product, glass pulverized product, resin pulverized product, Examples include metal particles and the like, and those obtained by coloring these surfaces.
The mixing ratio of the aggregate is usually 1000 parts by volume or less, preferably 500 parts by volume or less, more preferably 300 parts by volume or less with respect to 100 parts by volume of the resin solid content of the component (a).

In the composition of the present invention, an adsorbent can also be mixed. By mixing such an adsorbent, moisture absorption and desorption or chemical substance adsorption can be enhanced.
Examples of the adsorbent include amine compounds, urea compounds, amide compounds, imide compounds, hydrazide compounds, azole compounds, azine compounds, and layered phosphate compounds.

  In the composition of the present invention, in addition to the above-described components, components that can be used in ordinary paints can also be included. Such components include, for example, color pigments, thickeners, film-forming aids, leveling agents, plasticizers, antifreeze agents, pH adjusters, preservatives, antifungal agents, antialgae agents, antibacterial agents, dispersions Agents, antifoaming agents, ultraviolet absorbers, antioxidants, fibers, catalysts, crosslinking agents, and the like can be used.

  The composition of the present invention is a coating composition for buildings, and can be suitably used particularly as an interior finishing paint. Applicable base materials include, for example, gypsum board, plywood, concrete, mortar, porcelain tile, fiber mixed cement board, cement calcium silicate board, slag cement pearlite board, asbestos cement board, ALC board, siding board, extrusion board , Steel plate, plastic plate and the like. The surface of these base materials may have been subjected to some surface treatment (for example, a sealer, a surfacer, a filler, etc.), and has already been provided with a coating film, or has already been applied with wallpaper. Also good.

The composition of the present invention becomes a final finishing layer, and a coating film is formed by applying to the substrate as described above. As a coating method, a known method can be employed. For example, trowel coating, spray coating, roller coating, brush coating and the like are possible. Of these, the iron coating is preferred in the present invention.
The thickness of the dry coating film is not particularly limited, and can be set as appropriate. In the case of a thick film type, it is 0.2 to 5 mm (preferably 0.5 to 4 mm, more preferably 0.8 to 4 mm). do it. If it is such thickness, various uneven | corrugated patterns can be formed and it is suitable also at the point of expression of effects, such as moisture absorption / release property and chemical substance adsorption property. Moreover, even if this invention composition is a case where such thick coating is performed, the crack of a coating film can fully be prevented.
At the time of application, the viscosity of the paint can be appropriately adjusted by diluting with water or the like. The dilution ratio is usually about 0 to 10% by weight.

  Examples are given below to clarify the features of the present invention.

Example 1
Manufacture of paints For 100 parts by volume (solid content) of binder, 23 parts by volume of spherical particles, 40 parts by volume of adsorbent powder, 322 parts by volume of extender pigment, 165 parts by volume of aggregate, and 15 parts of color pigment A volume part, 3 parts by volume of an adsorbent, 5 parts by volume of a thickener, and 5 parts by volume of an antifoaming agent were mixed and stirred uniformly by a conventional method to produce a paint. In addition, the raw material used for manufacture of a coating material is as follows.
-Binder: Acrylic resin emulsion (solid content 50%, glass transition temperature -15 ° C)
-Spherical particles: hollow glass beads (average particle diameter 40 μm, density 0.4 g / cm ³ , ratio of major axis to minor axis 1.0)
・ Adsorbent powder: Silica gel (average particle size 5μm)
・ External pigment: heavy calcium carbonate (average particle size 20 μm)
・ Aggregate: Cold water stone (average particle size 150μm)
Coloring pigment: Titanium oxide (average particle size 0.3 μm)
・ Adsorbent: Crystalline layered phosphate compound ・ Thickener: Cellulosic thickener ・ Defoamer: Silicone defoamer

Test Method The following test was performed on the paint obtained by the above method.
(1) Dirt removability test A paint was applied on a glass plate so that the dry film thickness was 1 mm, and was cured for 14 days in a standard state.
Next, various dirt components (pencil, highlighter pen, soy sauce, sauce) were attached to the surface of the coating film, and left for 1 hour in a standard state, and then rubbed with a sponge while flowing water. Here, the remaining degree of the soil component was confirmed. The evaluation criteria were ◎ when the dirt was completely removed, ◯ when the dirt was almost removed, Δ when the dirt remained slightly, and x when the dirt was clearly left.

(2) Crack resistance test As a test substrate, a glass substrate with a mold attached around it was prepared. The mold was provided with a step so that the half surface had a height of 4 mm and the remaining half surface had a height of 2 mm.
A paint was applied to the mold of the test substrate using a trowel and dried for 7 days at a standard state and at 5 ° C., and the state of the coated film after drying was confirmed. The evaluation criteria were ◎ when no cracks occurred, ◯ when almost no cracks occurred, Δ when slightly cracked and × when cracks were clearly generated.

(3) Moisture absorption and desorption property The moisture absorption and desorption amount was measured by the method of JIS A6909: 2003 “Finishing material for construction” 7.32. In addition, the dry film thickness of the coating film was 1 mm. The evaluation criteria are: moisture absorption / release 70 g / m ² or more ◎, 50 g / m ² or more and less than 70 g / m ² ○, 20 g / m ² or more and less than 50 g / m ² Δ, and less than 20 g / m ² ×. did.

(4) Formaldehyde adsorption test A paint was applied to a 150 x 70 x 0.8 mm aluminum plate so that the dry film thickness was 1 mm, and then cured in a standard state for 14 days to prepare a test specimen.
This test body was put in a 3 L odor bag, formaldehyde gas was injected therein to a concentration of 100 ppm, and the residual gas concentration after standing for 24 hours in a standard state was measured with a gas detector tube. The adsorption rate was calculated from the residual gas concentration and the initial gas concentration. In the evaluation, an adsorption rate of 95% or more was evaluated as ◎, 90% or more and less than 95% as ○, 80% or more and less than 90% as Δ, and less than 80% as ×.

Test results The test results are shown in Table 2. In Example 1, generally good results could be obtained.

(Example 2 to Example 3)
The test was conducted in the same manner as in Example 1 except that the paint shown in Table 1 was used. The test results are shown in Table 2. In Examples 2-3, good results could be obtained.

(Comparative Example 1)
The test was conducted in the same manner as in Example 1 except that the paint shown in Table 1 was used. The test results are shown in Table 2. In Comparative Example 1, the result was insufficient as compared with the Example.

Claims (3)

The coating composition has at least one performance selected from moisture permeability, moisture absorption / release properties, and chemical substance adsorptivity,
Binder (a), spherical particles (b) having an average particle diameter of 5 to 200 μm, non-spherical particles (c) having an average particle diameter of 1 to 100 μm and having an average particle diameter smaller than that of the spherical particles, The volume ratio of the component (b) and the component (c) is 1:99 to 90:10, and the total amount of the component (b) and the component (c) is 100 with respect to 100 parts by volume of the resin solid content of the component (a). A coating composition for buildings characterized by being -2000 parts by volume.   The ratio of the average particle diameter of (b) component and the average particle diameter of (c) component is 100: 1-100: 80, The coating composition for buildings of Claim 1 characterized by the above-mentioned. (C) As a component, the granular material which has the adsorption capacity of a water | moisture content and / or a chemical substance is included, The coating composition for buildings in any one of Claims 1-2 characterized by the above-mentioned.