JP2013023624A - Film composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film composition which can contribute to improvement of luminous intensity (brightness) inside a house or the like without changing illumination when it is applied on a wall inside the house or the like.SOLUTION: The film composition forms a solid film composed by dispersing a metal oxide spherical fine particle and a white pigment, titanium oxide, in a synthetic resin. The median size of the spherical fine particle is in a range of 0.1 to 1.0 μm. The composition of the solid film satisfies following conditions: spherical fine particle of 10 to 60%, titanium oxide of 10 to 40%, spherical fine particle+titanium oxide of 40 to 75%, and spherical fine particle/titanium oxide of 0.2 to 5.0.

Description

  The present invention relates to a coating material composition. In particular, when applied to the interior (closed) space of a building and applied to the parts (walls, ceilings, pillars, beams, etc.) that require lighting, the illuminance ( It is an invention relating to a coating material composition (paint) that can contribute to (brightness) improvement.

  Here, “indoor” means a closed space surrounded by walls, roofs, ceilings, and the like. That is, not only inside buildings (including tunnels, underground passages, and subway platforms), but also inside buildings (trains, airplanes, ships), etc., internal passages (stairs and corridors), Includes the interior of a car.

  In addition, in the following description, the case where it applies mainly to the indoor of a building is demonstrated as a typical thing among them.

  In the specification and claims, “parts” and “%” indicating the blending units are mass units unless otherwise specified. The meaning of each technical term is as follows.

1) “60 ° Gloss”: 60 ° Gloss in JIS K5600-4-1 “Specular Gloss”
2) “Lightness index (L *)”: “CIE 1976 (L * a * b) color system”
3) “Diffuse reflectance”: Total reflectance and specular reflectance measured with an integrating sphere spectrophotometer, and the value obtained by subtracting the specular reflectance from the total reflectance (visible light),
4) “Illuminance”: a value measured with an illuminometer as defined in JIS C1609,
5) “Median diameter (50% value)”: median diameter based on JIS Z8825-1 “Laser diffraction distribution curve”, measured using “HORIBA LA-750” (trade name, manufactured by Horiba, Ltd.) in the test example. ,
6) “Spherical”: a sphericity of 0.7 or more (a sphericity of less than 0.7 is “non-spherical”). “Sphericality” is a scanning electron microscope (SEM). ) Obtained from the following formula based on the area and perimeter of the particles obtained from the photograph taken in ()
(Sphericity) = {4π × (area) ÷ (perimeter) ² }

  In order to perform human activities safely, easily and comfortably, appropriate illuminance (brightness) suitable for the content of the activities is required. For example, in JIS Z9110, an illuminance standard is shown for each “area, type of work or activity”.

  For example, “office / office space / office” is defined as 750 lux, “office / common space / meeting room” is defined as 500 lux, and “normal visual work in factory / work / general manufacturing factory” is defined as 500 lux. Yes.

  In a building (such as a room), an appropriate illuminance is obtained mainly by artificial lighting.

  On the other hand, in recent years, interest in energy saving has been increasing, and artificial lighting is also required to have high energy efficiency.

  In order to cope with this, it is conceivable that the wall surface of the room or the like is a mirror surface having a high reflectivity, but this is limited by a request for amenity (comfort) in the room.

  For this reason, when applied indoors etc., the appearance of the indoor mat paint which can contribute to the brightness improvement of a room is desired.

  However, the present inventors do not know the existence of such a paint (coating material; coating material composition).

  In Patent Document 1, for the purpose of “providing a paint having a required hue and providing high solar reflectance only by containing a relatively small amount of a color pigment other than white” (paragraph 0006), “white "Paints characterized in that rutile titanium oxide having an average particle size of 0.5 to 1.4 µm is used as a pigment" (claim 1 etc.) are only proposed.

  The paragraph 0004 of this document states that “in order for a human to recognize an object as white, the visible light region of 0.35 to 0.78 μm needs to be reflected at a high level. Here, the visible light region 0 It is reasonable to use rutile titanium oxide having a particle diameter of approximately half of this wavelength as a pigment for white paint in order to reflect .35 to 0.78 μm ”.

  Further, although not affecting the patentability of the present invention, Patent Documents 2 and 3 exist as prior art documents using the “spherical fine particles made of metal oxide” used in the present invention.

  In Patent Document 2, for the purpose of providing a water-based coating composition having high heat shielding properties, “a water-based coating composition in which inorganic particles including spherical metal oxide particles are blended” (Claim 1 and the like). ) Has been proposed.

  In Patent Document 3, for the purpose of providing a heat ray reflective wallpaper having high heat ray reflectivity, that is, for improving the heating efficiency, “sheet-like base material and metal oxide spherical fine particles are blended, A heat ray reflective wallpaper characterized by having a heat ray reflective layer formed on at least one surface side of the shaped substrate ”(claim 1, paragraph 0003, etc.).

JP 2006-8874 A Special Table 2006/104290 Publication JP 2007-314912 A

  In view of the above, an object of the present invention is to provide a coating material composition that can contribute to improvement of illuminance (brightness) in an indoor environment without changing illumination when applied to an indoor wall surface or the like. .

  As a result of intensive development in order to solve the above-mentioned problems, the present inventors have conceived a coating material composition having the following constitution.

A coating material composition for forming a solid coating in which spherical fine particles made of metal oxide and titanium oxide as a white pigment are dispersed in a synthetic resin,
The median diameter of the spherical fine particles is in the range of 0.1 to 1.0 μm,
The composition of the solid coating is
Spherical fine particles: 10-60%
Titanium oxide: 10-40%,
Spherical fine particles + titanium oxide: 40 to 75%, and
Spherical fine particles / titanium oxide: 0.2-5.0
It meets the requirements of

  When the coating material composition of the present invention is applied to an indoor wall surface or the like, it can increase the illuminance (brightness) in the interior without changing the illumination, and as a result, the energy used for the illumination can be reduced. it can.

It is explanatory drawing of the test method in Test example A at the time of applying to an indoor wall surface using the coating-material composition (paint) of the Example and comparative example of this invention. It is explanatory drawing of the test method in the test example B at the time of applying to the inner surface of a lighting cover using the coating-material composition (paint) of the Example of this invention, and a comparative example and a comparative example. It is explanatory drawing of the test method in the test example C at the time of applying to the side wall surface of an outdoor channel | path using the coating-material composition (paint) of the Example of this invention, and a comparative example and a comparative example.

  Embodiments of the present invention will be described below.

  The coating material composition (coating material) according to the present invention has a matrix (binder) having a synthetic resin composed of metal oxide spherical fine particles (hereinafter simply “spherical fine particles”) and white pigment titanium oxide. It is dispersed to form a solid film (coating film). The dispersion state of the spherical fine particles in the coating material composition is desirably dispersed so that the spherical fine particles do not form secondary particles (aggregated particles). A larger illuminance (brightness) improvement effect can be stably exhibited.

  Here, the coating material composition will be described by taking a paint as an example, but the solid coating (coating) formed by the coating is preferably matte.

  Here, the reason why the paint is matted is that if the gloss is present, the change in illuminance becomes abrupt. This is because a gentle change in illuminance is desirable from the viewpoint of the indoor environment. The level of matting means that the 60 ° glossiness is 10 or less. The 60 ° gloss is preferably 8.0 or less, more preferably 6.0 or less, and even more preferably 4.0 or less. That is, the lower the ratio of regular reflectance (specular reflectance) in the total reflectance of the wall surface, the relatively higher the ratio of diffuse reflectance, and the matte wall surface.

  When the particle size of the spherical fine particles is in a specific range, the ratio of total reflectance (whiteness) and diffuse reflectance in the visible light wavelength region increases in synergy with titanium oxide, which is a white pigment.

  The particle size of the spherical fine particles is appropriately selected from the range of median diameter of 0.1 to 1.0 μm, preferably from 0.3 to 0.8 μm. By blending spherical fine particles in this range together with titanium oxide, a large amount of visible light can be reflected, so that the illuminance of the surroundings can be improved.

  Examples of the metal oxide include silica, alumina, zirconia and the like, and silica is desirable.

More desirably, “fine particle silica having a specific surface area of 30 m ² / g or less and a sphericity of 0.7 or more, marketed by one of the present applicants under the trade name“ Admafine ”(registered trademark). Can be suitably used.

  The blending amount of the spherical fine particles is preferably 10 to 60%, more preferably 15 to 40%, and still more preferably 20 to 40% in the composition of the solid coating (solid content). When the blending amount of “spherical fine particles” is outside the above range, it is difficult to obtain an effect of increasing the ratio of total reflectance and diffuse reflectance in synergy with titanium oxide, and as a result, it is difficult to obtain an effect of improving illuminance.

  In addition to titanium oxide, various white pigments other than titanium oxide, and organic and inorganic coloring pigments may be used in combination. In that case, the addition amount of other pigments is adjusted so that the lightness index (L *), which is an indirect index of whiteness (total reflectance) in the coating film, is 80 or more, desirably 85 or more, more desirably 90 or more. adjust. When the lightness index (L *) is low, it is difficult to increase the total reflectance, and as a result, it is difficult to obtain the illuminance improvement effect of the present invention.

  The blending amount of “titanium oxide” is preferably 10 to 40%, more preferably 22 to 35%, and even more preferably 22 to 30% in the solid coating composition. If the amount of “titanium oxide” is too small, it is difficult to obtain an effect of increasing the total reflectance. If it is excessive, the proportion of the spherical fine particles is relatively reduced, and the total reflectance and diffuse reflectance due to synergy with the spherical fine particles are reduced. It is difficult to obtain the effect of increasing the ratio, and as a result, it is difficult to obtain the illuminance improvement effect of the present invention.

  The total amount of spherical fine particles and titanium oxide is preferably 40 to 75%, more preferably 43 to 62% in the solid coating composition. If the total amount is small, it is difficult to increase the total reflectance and the diffuse reflectance ratio, and it is difficult to exert the illuminance improvement effect of the present invention.

  Furthermore, the ratio of the spherical fine particles to titanium oxide (the former / the latter) is preferably 0.2 to 5.0, and more preferably 0.4 to 2.0. Even if the ratio of titanium oxide is excessive or small, it is difficult to achieve the effect of increasing the total reflectance and the diffuse reflectance ratio of the present invention, and as a result, it is difficult to exhibit the effect of improving the illuminance.

  Of the titanium oxides, rutile-type titania is desirable because it has a refractive index of 2.70, which is the largest among white pigments and contributes to an increase in total reflectance.

  Moreover, the following can be mentioned as a white pigment and a coloring pigment combined with a titanium oxide.

  White pigment: zinc white, lithopone, lead white, etc.

  Coloring pigment: Cadonium red, red bean, toluidine red, yellow lead, iron yellow, titanium yellow, fast yellow, anthraquinone yellow, benzidine yellow, chromium oxide, phthalocyanine green, bitumen, ultramarine blue, phthalon cyanine blue, carbon black, iron Ink, graphite, etc.

  Examples of the synthetic resin (binder) include the following various thermoplastic / thermosetting synthetic resins.

  Acrylic resin, styrene resin, urethane resin, silicone resin, fluorine resin, epoxy resin, melamine resin, alkyd resin, vinyl chloride resin, vinyl acetate resin, polyester resin.

  These resins may be appropriately selected from various forms. For example, an emulsion system in which a synthetic resin is dispersed in water, which is a dispersion medium, or a solution system in which a synthetic resin is dissolved in a solvent such as water or an organic solvent can be used.

  Here, the composition of the synthetic resin (binder) in the solid coating is preferably 5 to 25%, more preferably 5 to 20%.

  Alternatively, a solventless synthetic resin that does not use a solvent may be used. The coating material composition using the synthetic resin of these forms becomes a coating material such as a paint, and after coating, forms a solid coating (coating film) by drying or reaction curing.

  In addition to the above, for example, a thermoplastic resin (hot melt type) melted by heating can be used. The resin is solidified and a solid coating (coating film) can be formed by cooling a thermoplastic resin that has been heated and melted and in which components containing metal oxide spherical fine particles and titanium oxide are dispersed.

  The matte paint (coating material composition) of the present invention further comprises other auxiliary materials such as extender pigments (calcium carbonate, kaolin clay), coating film forming subelements (dispersant, wetting material, antifoaming agent, thickening agent). Agents, antiseptics, antifungal agents, etc.), and further, coating film formation aids (antifreezing agents, film-forming aids, fragrances) are appropriately added.

  The desirable solid film composition (1) and the more desirable solid film composition (2) of the matte paint of the present invention are as follows.

Composition of solid coating (1)
Spherical fine particles: 10-60%
Titanium oxide: 10-40%,
Spherical fine particles + titanium oxide: 40 to 75%, and
Spherical fine particles / titanium oxide: 0.2-5.0

Composition of solid coating (2)
Spherical fine particles: 15-40%,
Titanium oxide: 22-35%,
Spherical fine particles + titanium oxide: 43 to 62%,
Spherical fine particles / titanium oxide: 0.4 to 2.0

  The coating material composition of the present invention having the above composition is appropriately adjusted to a viscosity with water or other dispersion medium, and applied to a required site by a general application means such as spraying or brush coating, Used for construction of matte paint. Thus, a solid coating formed of the coating material composition may be provided on all or part of the indoor wall surface or outdoor wall surface of the building.

  The coating thickness at this time is 30 to 1000 μm, desirably 50 to 300 μm. If the coating thickness is too thin, it is difficult to obtain the effect of improving indoor illuminance, and if it is too thick, further increase in the effect of improving indoor illuminance cannot be expected.

  The coating material composition (paint) usage mode of the present invention is used when a solid coating (coating film) is formed by directly coating indoor wall surfaces (columns, beams, walls, etc.) that receive illumination light of the building to be applied. Not limited to.

  A film-like or sheet-like (plate-like) member formed only by the coating material composition or via the support may be formed (attached or the like) at a site to be applied.

  For example, when the application site is a wall surface, a coating film made of a coating material composition is formed in advance on the surface of a wall material (for example, a plywood or a slate plate) that forms a wall or a ceiling, and the wall material is By attaching and forming a wall or ceiling, a chamber (closed) space having a coating film on the surface can be formed. Moreover, the room space which has the film | membrane by a coating material composition on the surface can also be formed by previously forming a coating film on the surface of finishing materials, such as wallpaper, and sticking the wallpaper on a wall surface. Furthermore, a plate-shaped member can also be used as a coating material or partition for other members.

  In addition, since the coating material composition of the present invention efficiently diffuses and reflects visible light, it can exert an effect of improving ambient illuminance even when it is applied to a portion other than the indoor or a placement member. In particular, when applied to all or part of a wall surface (wall surface or arrangement member) that receives illumination light from an artificial light source (LED, incandescent bulb, fluorescent lamp, etc.), the ambient illuminance can be further improved by the artificial light source.

  Other than indoors, the effect is particularly great when applied to a ceiling wall surface that forms an open space. For example, the ceiling wall surface of an open parking lot with a roof, the ceiling wall surface of a station platform, the ceiling side wall surface of a piloty, and further, a viaduct pier, a bridge plate, and a girder bottom surface.

  Furthermore, even when used for a cover of a lighting fixture, a signboard that is lit up by artificial lighting, etc., the illuminance improvement effect is exhibited.

  Hereinafter, in order to confirm the effect of this invention, the Example performed with the comparative example is described. The illuminometer used was "TOPCON ILLUMINATION METER IM-1" manufactured by Topcon.

<Test Example A>
A paint (coating material composition) having each composition shown in Table 1 was prepared, and a test cubic box (plate material: slate plate) 11 having an inner side of 910 cm and an opening capable of closing the front surface was prepared. In addition, the floor 13 was applied with a commercial gray color coating (twice with a dry film thickness of 150 μm).

  Comparative Example 1 corresponds to a conventional example in which fine silica is not added, and Comparative Examples 2 and 3 are test examples in which silica fine particles (spherical fine particles) / titanium oxide have excessive silica fine particles and silica fine particles are insufficient.

  Then, all the side walls (including the inner surface of the front lid) 15,... And the ceiling wall 17 were subjected to undercoating with a roller using the paint of Comparative Example 1 (dry film thickness 150 μm), each Example and Comparative Example. Using the paint of the example, it was overcoated with a roller and dried (dry film thickness 150 μm).

  Then, a lighting fixture (straight tube fluorescent lamp: daylight color 10 W) 19 is attached to the center of the ceiling wall 17, an illuminometer 20 is arranged at the center of the floor 13 immediately below the lighting fixture 19, and the front is closed with a lid. It was measured.

  For each paint, 1) 60 ° gloss, 2) lightness index (L *), and 3) diffuse reflectance were also measured according to the method described above.

  From Table 2 showing the results, the following can be understood.

  As for the illuminance of each of Examples 1 to 5, the higher the diffuse reflectance, the greater the illuminance improvement effect. That is, as compared with Comparative Example 1 (corresponding to the conventional example), the illuminance was remarkably improved as compared with Comparative Example 2 with excess titanium oxide and Comparative Example 3 with insufficient titanium oxide.

  In particular, Examples 1 to 3 in which the compounding ratio and the total compounding amount of silica fine particles and titanium oxide are within the range of the preferred composition of the present invention have a remarkable effect of improving illuminance. In particular, in Examples 2 and 3, the illuminance improvement effect is remarkable even though the 60 ° glossiness is low (the matteness is high).

<Test Example B>
This test example is a test example applied to the cover body 22 of the lighting fixture 21 (FIG. 2).

  The inside of the cover body 22 of the lighting fixture (fluorescent tube 40W or LED tube 22W: both 120 cm in length) 21 is coated 25 in the same manner as in Test Example A with the coating film of Comparative Example 1 and Example 2 to prepare the test body. Prepared.

  In the control example, a commercially available glossy paint was applied twice (total film thickness 250 μm) to prepare a test specimen. The coating properties of the commercial paint were 60 ° gloss: 87.0, lightness index (L *): 96.1.

  The lighting fixture 21 to which the cover of each test specimen is attached is attached to the ceiling of a room (floor: about 200 cm × about 350 cm, ceiling height: about 220 cm) B as shown in the figure, and the floor directly below the lighting fixture 21 The illuminance meter 20 was disposed at the center of the surface 23, and the illuminance meter 20 'was disposed at the corner (back) of the floor surface 23 to measure the illuminance.

  The illuminance (lux) in each test example was as follows. The upper level is the illuminance at the center of the floor, and the lower level is the illuminance at the corner of the floor.

Control example (with gloss): 253 (fluorescent tube), 318 (LED)
116 (fluorescent tube), 135 (LED)
Comparative Example 1: 256 (fluorescent tube), 335 (LED)
122 (fluorescent tube), 138 (LED)
Example 2: 292 (fluorescent tube), 388 (LED)
142 (fluorescent tube), 166 (LED)
It was confirmed that the paint (coating material composition) of the present invention exerts a remarkable illuminance improving effect even in the corner of the room.

<Test Example C>
In the same room B as above, the walls other than the openings (windows and doors) are coated under the same conditions as in Test Example A using the paint of Comparative Example 1, and as in Test Example B, the center of the floor of the room The illuminance was measured at the corners of the floor. Furthermore, the paint of Example 2 was applied onto the paint of the above Comparative Example 1 under the same conditions as in Test Example A, and the illuminance was measured at the center of the floor and corners of the room as in Test Example B. .

  The illuminance (lux) in each test example was as follows. The upper level is the illuminance at the center of the floor, and the lower level is the illuminance at the corner of the floor.

Comparative Example 1: 268 (fluorescent tube), 321 (LED)
115 (fluorescent tube), 123 (LED)
Example 2: 301 (fluorescent tube), 364 (LED)
159 (fluorescent tube), 165 (LED)
When applied to a room, the paint (coating material composition) of the present invention exhibits a remarkable illuminance improvement effect (lower reduction than the center) not only in the center of the room but also in the corners of the room. Was confirmed.

<Test Example D>
This test example is a test example when applied to an outdoor passage that is an open space (see FIG. 3).

  Using the coating material of Comparative Example 1 and Example 2 on the wall surface (from the ceiling to the floor having a width of about 400 cm) D in the outdoor passage (width about 200 cm, ceiling height about 220 cm) D shown in FIG. The illuminance meter 20 was placed on the floor 29 just below the lighting fixture (fluorescent tube 40W, length of about 120 cm) 28 at night to measure the illuminance.

  The illuminance (lux) of each paint was Comparative Example 1: 121 and Example 2: 132. Even in an open space (outdoors), it was confirmed that the paint (coating material composition) of the present invention exerted a remarkable illuminance improving effect.

Claims (6)

A coating material composition for forming a solid coating in which spherical fine particles made of metal oxide and titanium oxide as a white pigment are dispersed in a synthetic resin,
The spherical fine particles have a median diameter (hereinafter simply referred to as “median diameter”) based on JIS Z8825-1 “Laser diffraction distribution curve” in the range of 0.1 to 1.0 μm,
The composition of the solid coating is
Spherical fine particles: 10-60%
Titanium oxide: 10-40%,
Spherical fine particles + titanium oxide: 40 to 75%, and
Spherical fine particles / titanium oxide: 0.2-5.0
A coating material composition characterized by satisfying the above requirements. A coating material composition for forming a solid coating in which spherical fine particles made of metal oxide and titanium oxide as a white pigment are dispersed in a synthetic resin,
While the median diameter of the spherical fine particles is in the range of 0.3 to 0.8 μm,
The composition of the solid coating is
Spherical fine particles: 15-40%,
Titanium oxide: 22-35%,
Spherical fine particles + titanium oxide: 43 to 62%,
Spherical fine particles / titanium oxide: 0.4 to 2.0
A coating material composition characterized by satisfying the above requirements.   3. The coating material composition according to claim 1, wherein the spherical fine particles are silica fine particles. The solid coating is
1) 60 ° glossiness in JIS K5600-4-1 “Specular gloss” (hereinafter simply “60 ° gloss”) 10.0 or less,
2) Lightness index (L *): 95 or more,
The film material composition according to claim 1, 2, or 3, wherein   In the indoor wall surface or outdoor wall surface of a building, all or part of the wall surface that receives illumination light includes the solid film formed of the film material composition according to any one of claims 1 to 4. Characteristic building wall.   It is a member arrange | positioned indoors or outdoors, Comprising: The whole surface or one part of the site | part which receives illumination light is equipped with the said solid film formed with the film material composition as described in any one of Claims 1-4. An arrangement member characterized by the above.

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