JP5368494B2 - Method for forming coating film on ceiling decorative board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for forming a coating film of a ceiling decorative board, which expresses a staid deep color or a real deep color without glossing, and also improving scratch resistance. <P>SOLUTION: The method includes: applying a deep color paint containing a colorant and having Munsell lightness value of 4.5 or less on the surface of a rock wool sound absorbing plate 10 as an under coat 11; and then applying a paint containing a deep color particle 14 having the similar color to the under coat paint and Munsell lightness value of 2.0 or less so as to make the thickness smaller than the diameter of the deep color particle 14 as a top coat 13 to be applied on the under coat 11. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a method for forming a novel dark color coating film excellent in scratch resistance for a decorative ceiling board.

  In ceiling decorative panels in commercial and public facilities, fireproof performance and sound absorbing performance are required, so there are many cases where ceiling decorative panels made of rock wool sound absorbing boards, which are porous and non-combustible base materials, are constructed. The surface may be finished using dark colors such as dark brown, dark blue, or black according to the usage space, not limited to light colors such as white. For example, a ceiling decorative board used in a space that needs to be darkened by dropping indoor lighting, such as a museum, a movie theater, or a planetarium, may be finished in dark brown, dark blue, or black. In order to darken the surface of the ceiling decorative board, for example, a pigment such as carbon black, red lead, and bitumen can be added and painted with a paint colored darkly to some extent.

  However, the surface of the ceiling decorative panel made of rock wool sound-absorbing board is porous and fibrous, so it tends to be uneven in coating, or when it receives oblique light, partial irregular reflection is likely to occur in the coating film part of the part. Therefore, it was difficult to express a deep dark color or a true dark color on the entire ceiling.

  In addition, when the ceiling decorative panel is constructed in the field, in the case of the dark color, there is also a problem that the rubbed part or the struck part tends to be whitish or scratched, and these are easily noticeable as appearance defects. .

  Unlike the surface of such a porous and fibrous ceiling veneer, if the surface state is flat and smooth, even if it is painted with a colored paint, it is painted and expressed in a glossy and glossy lacquer-like dark color It is possible. If it is black, it is a jet-black tone with luster and luster that is called piano black. For example, a technique such as Patent Document 1 is also disclosed in a coating film structure that improves jetness. In order to increase the scratch resistance, it is conceivable to increase the coating resin strength by increasing the amount of resin in the paint.

  However, it is said that the glossy or glossy dark color should not be glossy because it can no longer be settled as a ceiling decorative board for interior use. In order to eliminate gloss, minerals such as silica and transparent particles can be added and adjusted. However, when this is done, the lightness changes and the color is rather dull (hazy) It will become a dark color.

  Also, in general, when the amount of resin in the paint increases, not only the gloss due to the resin will appear, but also because the surface is porous and fibrous, it can be applied to a rock wool sound absorbing plate with fine irregularities, resulting in uneven gloss. It becomes easy to come out. The invention described in Patent Document 1 is a technique for which lacquer black is intended, but it is a technique for forming a coating film on a flat base material such as a steel plate, which is applied to a porous and fibrous base material. Simple application is difficult.

JP 2005-138057 A

  The present invention has been made in view of such a conventional example, and it is a deep dark color that is calm without giving gloss to a ceiling decorative board made of a rock wool sound absorbing board having a porous and fibrous surface with fine irregularities. The challenge is to develop a method of forming a coating film for a ceiling decorative board that can be expressed in a true dark color and can also improve scratch resistance.

The invention described in claim 1 relates to a method of forming a coating film having a two-coating structure on a ceiling decorative board (1),
As a primer (11) on the surface of the rock wool sound absorbing plate (10), a colorant is added and a dark paint with a Munsell value of 4.5 or less is applied,
Next, as a top coat (13) to be applied over the undercoat (11), a paint to which dark particles (14) having the same color as the undercoat paint and a Munsell lightness of 2 or less are added is used. It is characterized by being applied so as to have a film thickness thinner than the diameter of

The invention described in claim 2 relates to a method for forming a coating film having a three-coat film structure on a ceiling decorative board (1).
Undercoat a water-based resin paint on the surface of the rock wool acoustic board (10),
Next, as an intermediate coat (12) to be overlaid on the undercoat (11), a colorant is added and a dark paint having a Munsell value of 4.5 or less is applied,
Subsequently, as a top coat (13) to be overlaid on the intermediate coat (12), a paint to which dark particles (14) having the same color as the intermediate coat and having a Munsell lightness of 2 or less are added is used. It is characterized by being applied so as to have a film thickness thinner than the diameter of

The method for forming a coating film according to claim 3 comprises:
It is characterized in that a deep colorant having the same color as that of the paint in the lower layer on which the top coat (13) is superimposed is further added to the top coat.

   According to the present invention, immediately below the top coat (13) having a film thickness smaller than the diameter of the particles (14), a coating of a bottom or intermediate coat (11) (12) having a Munsell value of 4.5 or less in brightness is applied. As a result, the dark color of the thin film of the top coat (13) to the bottom or middle coat (11) (12) can be seen through, and from the surface side the bottom or middle coat (11) (12) The surface ground color of the rock wool sound absorbing plate (10) is surely hidden by the coating and does not appear outside, and the dark particles (14) in the same system as the paint of the undercoat or intermediate coat (11) (12) are Since it is slightly out of the top coat (13) (with the head peeked out), the dark color of the dark particle (14) over the head and the gap between the particles (14) are filled. The dark color of the undercoat or middle coat (11) (12) of the system color is visible through the thin coat (13), and the darker shade due to the shadow of the particles (14) is reflected in the overcoat (13). It gives a three-dimensional effect, and over the entire surface due to the presence of particles (14) Appropriate diffusion of light occurs uniformly, so that it is possible to perceive a calm deep dark color or true dark color on the entire surface of the ceiling decorative board (1) without variation.

  If the same color as the lower or intermediate coating or dark colored particles (14) is added to the upper coating, the lower or intermediate coating (11) (12) or dark colored particles (14 ) In combination with the dark color of), a deeper dark color or a true dark color can appear.

  In addition, as described above, since the particles (14) are outside the coating film of the top coat (13), even if the object hits the surface or is rubbed due to contact, they are not applied to the particles (14). The coating of the top coat (13) does not come into direct contact with the coating and the coating of the top coating (13) is prevented from being scratched, so that the surface is hardly scratched during construction.

Sectional drawing of the rock wool sound-absorbing board in which the coating film of the three-layer structure of this invention was formed Sectional drawing of the rock wool sound-absorbing board in which the coating film of the two-layer structure of this invention was formed

  The present invention will be described below with reference to the illustrated embodiments. The sound-absorbing plate (10) used in the present invention is obtained by solidifying rock wool fibers in a plate shape with a binder, and on the surface thereof, fine shallow irregularities due to the fibers are formed over the entire surface. A large number of fine sound-absorbing pin holes (not shown) having a certain depth toward the surface are formed on the surface side, and are excellent in sound-absorbing property and fire-proof and fire-resistant properties, and are often used as so-called ceiling boards.

  A resin coating is applied to the surface of the sound absorbing plate (10) to form a cosmetic coating film. There are two types of coating films, namely, a base coating (11) and a top coating (13), and a coating layer having three coatings: a bottom coating, a middle coating and a top coating (11), (12) and (13). The dark colorant is added to at least the layer immediately below the topcoat (13), the undercoat (11) in the former and the intermediate coat (12) in the latter.

  Even in the case of a two-coat structure of the undercoat (11) and the topcoat (13), it is possible to express a deep dark color as in the present invention by increasing the amount of the undercoat (11) applied. Since the drying efficiency of the paint is lowered and the productivity is low, it is desirable to have a three-coat film configuration. Hereinafter, the form in the case of 3 coating-film structure is demonstrated, and the case of 2 coating-film structure is demonstrated in it.

In the case of the three-coat film configuration, the paint for the undercoat (11) that becomes the bottom coat is not particularly selected, but for example, a general aqueous resin paint such as a vinyl acetate emulsion resin paint or an acrylic emulsion resin paint may be used. . The color is preferably dark, but may be white or other colors. It apply | coats to the surface of a rock wool sound-absorbing board (10) with the application quantity of 150-200 g / m < ² >. If it is less than 150 g / m ^{2, the} concealability of the surface color of the rock wool sound-absorbing plate (10), which is the base material color, is lowered, and the ground color is transparent. In addition, the effect of the intermediate coating material as a filler is also reduced. This is because if the amount is more than 200 g / m ^{2, the} amount of the coating material used is too large, the drying is difficult and the productivity is lowered as the economy is lowered. The coating means may be a known means such as a natural coater or a spray coater.

In contrast to the above, in the case of the two coating film configuration, the undercoat (11) also serves as the intermediate coat (12), so that the dark paint is added and the amount of the undercoat (11) applied is increased as described above. . The coating amount is 150 to 220 g / m ² and is applied to the surface of the rock wool sound absorbing plate (10). When the amount is less than 150 g / m ² , the concealability of the base color is lowered as described above, and the ground color is transparent. On the other hand, if the amount exceeds 220 g / m ² , the amount of paint used is too large, and it is difficult to dry as the economy decreases, resulting in a decrease in productivity, as well as blocking the sound-absorbing pin holes and reducing the sound absorption effect. become. The resin paint conforms to the above-described undercoat paint, and the dark colorant conforms to the intermediate coat of the three coating composition described below.

  The paint for the intermediate coat (12) may be a common water-based resin paint such as a vinyl acetate emulsion resin paint or an acrylic emulsion resin paint similar to the paint for the undercoat (11). It is assumed that the paint is made.

  The colorant is not particularly selected, and pigments such as carbon black, red lead, and bitumen are used. The dark color level is 4.5 or less in terms of Munsell brightness. For example, if the color is achromatic (black), N4.5 or less. This is because if it exceeds 4.5, it becomes difficult to obtain a desired dark color. In addition to the single color, other colors such as red and blue may be mixed with black.

The intermediate coating (12) is applied at a coating amount of 140 to 190 g / m ² . If it is less than 140 g / m ² , the density becomes sparse and a stable dark color effect cannot be obtained, and the color of the undercoat (11) can be seen through, and if it is more than 190 g / m ² This is because not only the drying efficiency is lowered, but also the sound absorbing effect is lowered by closing the sound absorbing pin hole as described above. Also in this case, the application means may be a known means such as the above-mentioned natural coater, spray coater, or curtain flow coater.

  Similarly, the paint for the top coat (13) may be a general water-based resin paint such as a vinyl acetate emulsion resin paint or an acrylic emulsion resin paint, but it is assumed that dark particles (14) are added. When the colorant is not added, the top coat (13) may be transparent or translucent, as long as it allows the color of the lower layer that has been overcoated to be seen through. When a colorant is added, the same color as the dark color particles (14) is selected. Since the same color also appears in the gaps (14a) between the particles (14), the shadow of the dark color particles (14) is reflected in the overcoat (13), and a three-dimensional and more effective deep dark color is obtained. As already mentioned, minerals such as silica and transparent particles are not added to the coating for the top coat (13). When added, these have the effect of causing irregular fine irregularities on the surface of the overcoat (13) to erase the gloss and luster of the surface of the coating, but on the other hand, minerals such as silica and transparent particles are dark particles ( This is because the brightness changes due to overlapping with 14), giving a rather dull impression (dull impression, hazy impression, etc.) as a dark color. In the case of a two-coat film structure, it is desirable to add a colorant to the top coat.

The dark colored particles (14) are hard spherical particles such as acrylic resin and urethane resin, or a shape close to a spherical shape, for example, a rugby spherical shape or an egg-shaped shape, and the whole is formed of a spherical surface and has no corners. Is preferred .

  The dark particles (14) have the same color as the paint (colorant) for the intermediate coating (12). In addition to the single color, other colors such as red and blue may be mixed with black. The dark color level of the dark particle (14) may be 2 or less in terms of the Munsell value. For example, if the color is achromatic (black), N2 or less. This is because if it exceeds 2, a deep color as desired cannot be obtained.

The diameter of the dark colored particles (14) is preferably 20 μ to 100 μ, more preferably 20 μ to 40 μ. If it is smaller than 20 μm, it will be buried in the coating film of the top coat (13), resulting in insufficient light diffusion and uneven glossiness, and an effect on the scratch resistance of the coating film will not be obtained. If it is larger than 100μ, the gap between the particles (14) becomes too large and the luster due to the unevenness is conspicuous and the dark color stability is lowered, and the sound absorbing pin hole is easily closed and the sound absorbing property is lowered. is there. The diameter (namely, particle diameter) of the dark color particles (14) is sufficiently smaller than the pin hole. (The pin hole diameter is about 0.8 to 1.6 mm.)

  The amount of added particles is 10 to 20% by weight of the top coat. If the amount is less than 10% by weight, the density becomes sparse and insufficient as a deep dark color, and if it exceeds 20% by weight, the sound absorbing pin hole is easily blocked and the sound absorbing performance is lowered.

The viscosity of the top coating is preferably about 30 to 50 seconds for Ford Cup # 4. Further, it is applied at a coating amount of 70 to 100 g / m ² so that the coating film thickness is 10 μ to 18 μ smaller than the particle diameter so that a part of the surface of the dark colored particles (14) can be seen. . If it is less than 70 g / m ² , the density becomes sparse and insufficient as a deep dark color, and if it exceeds 100 g / m ² , the drying efficiency is lowered and the sound absorbing pin hole is easily closed, resulting in sound absorption performance. It is because it falls. The coating means may be a known means such as a spray coater or a curtain flow coater as described above.

  In the present invention, the dark color particles (14) and the colorant added to the water-based resin paint are all dark colors of the same system, and due to the above synergistic effect, when applied with a normal dark color paint (Munsell value) Compared to the lightness of 2.5 to 3.5), a darker, darker, deeper dark color or true dark color can be obtained, and the scratch resistance of the substrate surface can be improved, so that scratches and scratches can be caused during construction. Even if it is given, it can be made inconspicuous.

  In particular, by overlaying the undercoat (11), the intermediate coat (12), and the top coat (13), it is possible to eliminate the unevenness of suction into the fiber and obtain a stable and calm appearance, and dark particles ( 14) is distributed over the entire surface with a part of the head more than the coating film of the top coat (13), so that light can be evenly diffused in all directions, and uniform matte without uneven gloss A deep dark or true dark color can be obtained.

Base material: Rock wool sound absorbing board undercoat paint: White vinyl acetate emulsion paint Intermediate coat: Acrylic emulsion paint colored black with carbon black (Munsell brightness N3)
Top coating: Acrylic emulsion paint with black particles added
(Shimizu; 57.5% by weight, antifoaming agent; 0.2% by weight, thickening agent; 2.3% by weight, acrylic emulsion resin; 25% by weight, black particles of 30 μm with Munsell value N2; 15% by weight %)
The base coat was applied and dried at 180 g / m ² with a natural coater on the substrate, the intermediate coat was applied and dried at 170 g / m ² with a spray coater, and the top coat was applied and dried at 80 g / m ² with a spray coater. The film thickness of the top coating material was 15 μm, and the upper surface of the black particles was in a state of looking through the coating material. As a result, a deep black with no gloss was obtained. The lightness of the Munsell value was N2.

Comparative Example 1

Undercoat paint: White vinyl acetate emulsion paint Intermediate coat: Acrylic emulsion paint colored black with carbon black (Munsell brightness N3)
Top coat: Acrylic emulsion paint colored black with carbon black (Munsell brightness N3)
The base coat was applied and dried at 180 g / m ² with a natural coater on the substrate, the intermediate coat was applied at 170 g / m ² with a spray coater, and the top coat was applied at 80 g / m ² with a spray coater. The obtained color was black but not dark black, and the lightness of the Munsell value was N3.

(1) Ceiling veneer
(11) Undercoat
(12) Intermediate coating (13) Top coating
(14) Dark particles
(14a) Clearance

Claims (3)

As a primer on the surface of the rock wool sound absorbing plate, a colorant is added and a dark paint with a Munsell value of 4.5 or less is applied,
Next, as an overcoat to be applied over the undercoat, a paint with the same color as the undercoat paint and with dark particles with a Munsell value of 2 or less added is applied so that the film thickness is less than the diameter of the dark particles. A method for forming a coating film on a ceiling decorative board, comprising: Undercoat a water-based resin paint on the surface of the rock wool sound absorbing board,
Next, as an intermediate coat overlying the undercoat, a colorant is added and a dark paint having a Munsell value of 4.5 or less is applied,
Subsequently, as a top coat to be overlaid on the middle coat, a paint with the same color as the mid-coat paint and the addition of dark colored particles with a Munsell value of 2 or less is applied so that the film thickness is thinner than the diameter of the dark colored particles. A method for forming a coating film on a ceiling decorative board, comprising: 3. The method for forming a coating film for a ceiling decorative board according to claim 1 or 2, wherein a dark colorant having the same color as that of the lower layer paint on which the top coat is repeatedly applied is further added to the top coat paint. .

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