JP2005305215A - Ceramic building board and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ceramic building board capable of exhibiting sufficient luminescence and to provide a method for producing the same. <P>SOLUTION: A lower metallic coating layer 41 is formed on the design surface 201 of a starting ceramic board 2 by applying a first metallic coating material 40A containing 10 to 20 wt.%, based on the entire solids content, scaly luminescent material 5 in such a manner that the coating weight of the solids content is 15 to 25 g/m<SP>2</SP>and drying the applied first coating. An upper metallic coating layer 42 is formed on the lower metallic coating layer 41 by applying a second metallic coating material 42B containing 10 to 20 wt.%, based on the entire solids content, scaly luminescent material 5 onto the coating layer 41 in such a manner that the coating weight of the solids content is 5 to 9 g/m<SP>2</SP>and drying the applied second coating. The constituent scales of the luminescent material 5 are distributed in the upper metallic coating layer 42 so that they are substantially horizontal to the design surface 101 of the ceramic building board 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a ceramic building board formed by forming a metallic paint layer on the design surface of a ceramic board having fine irregularities and a method for manufacturing the same.

For example, in a ceramic building board to be constructed as an outer wall of a building, for example, a ceramic raw plate is formed from a mixed raw material made by mixing a wooden raw material or the like with a cement raw material, and various surfaces are formed on the surface of the ceramic raw plate The building board is manufactured by painting. In the coating, for example, a paint layer made of a colored paint is formed on the surface of a ceramic base plate, and then a clear layer made of a clear paint is formed on the surface of the paint layer.
And, for example, by arranging a glitter material made of mica flakes or metal powder on the inside of the clear layer or on the surface of the paint layer, a design appearance having glitter (glossiness) on the design surface of the building board. Forming.

Thus, as a method of forming a lustrous design appearance on the design surface of a building board, for example, in Patent Document 1, an aggregate made of synthetic resin emulsion and stone powder is formed on a base material or a construction surface. A first spraying material containing is applied, and then a second spraying material containing a synthetic resin emulsion for forming a clear layer and mica flakes is partially applied to provide glitter and peeling of the mica flakes There are few decoration materials.
In Patent Document 2, a cement that can maintain a metallic luster over a long period of time by spraying or spraying mineral powder or metal powder on the surface of the enamel paint applied on the substrate and then applying a clear paint. The board is manufactured.

Japanese Patent No. 3278139 JP-A-58-20786

However, the above-described conventional method for producing a building board is not sufficient when it is intended to express a design appearance having a further glitter on the design surface of the building board.
That is, since the ceramic base plate is made by mixing a wood raw material or the like with a cement raw material, for example, the wood raw material or the like is present on the surface or in the vicinity of the surface, so that fine irregularities are formed. Therefore, when a clear paint containing a glittering material is applied to the surface of the ceramic base plate, the glittering material in the clear paint enters the concave portions of the fine irregularities, and the necessary glitter can be exhibited. There wasn't.

  The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a ceramic building board capable of exhibiting sufficient glitter and a method for manufacturing the same.

The first invention is a method for producing a ceramic building board by forming a metallic paint layer on the design surface side of the ceramic base plate having a design surface with fine irregularities,
On the design surface side of the ceramic base plate, a first metallic paint containing a scale-like glittering material in an amount of 10 to 20 wt% in the solid content of the paint, the coating amount of the paint solid content is 15 to 25 g / m ^2. Paint and dry to form a lower metallic paint layer,
Next, on the lower metallic paint layer, a second metallic paint comprising 10 to 20 wt% of a scaly glittering material in the solid content of the paint, the coating amount of the paint solid content is 5 to 9 g / The ceramic metal building board manufacturing method is characterized in that the upper metallic paint layer is formed by painting and drying to m ² (Claim 1).

In the method for producing a ceramic building board of the present invention, a lower metallic coating layer and an upper metallic coating layer are sequentially laminated on the design surface of the ceramic manufacturing original plate to form a metallic coating layer.
That is, when forming the metallic paint layer, the first metallic paint is applied on the design surface side of the ceramic base plate and dried to form the lower metallic paint layer. At this time, at least a part of the glitter material in the first metallic paint is erected in a state close to vertical and disposed in the lower metallic paint layer. Further, at least a part of the glittering material in the first metallic paint is disposed in the lower metallic paint layer so as to enter into the recesses in the fine unevenness formed on the design surface of the ceramic building board.

Therefore, in the present invention, the first metallic paint is applied in such a manner that the coating amount of the paint solid content is 15 to 25 g / m ² with respect to the design surface of the ceramic base plate. Thereby, it is possible to sufficiently ensure the thickness of the lower metallic paint layer, even if at least a part of the glittering material is arranged upright in the lower metallic paint layer, Even if it arrange | positions so that it may enter into the recessed part in a fine unevenness | corrugation, a glittering material can fully be distributed on the design surface side of a ceramics-type building board.
Further, the first metallic paint is filled in the concave portions of the fine irregularities, and the surface of the lower metallic paint layer can be formed in a substantially flat shape or a nearly flat state.

Then, the second metallic paint is applied on the lower metallic paint layer and dried to form a lower metallic paint layer. At this time, the glittering material in the second metallic paint is disposed on the surface of the lower metallic paint layer formed in the above-described substantially flat shape or nearly flat state.
Therefore, the glitter material in the second metallic paint is arranged in a substantially horizontal shape (including a state close to the horizontal) in the upper metallic paint layer.

Thereby, on the design surface of the ceramic building board, sufficient glitter can be exhibited by the glitter material arranged substantially horizontally in the upper metallic paint layer.
Moreover, even if the coating amount of paint solids in the second metallic paint is 5 to 9 g / m ^{2 and} less than the coating amount of the first metallic paint, it exhibits sufficient glitter on the design surface of ceramic building boards. Can be made. Further, the glitter caused by the glitter material arranged in the upper metallic paint layer can be supplemented by the glitter material arranged in the lower metallic paint layer.
Therefore, according to the method for manufacturing a ceramic building board of the present invention, it is possible to manufacture a ceramic building board capable of exhibiting sufficient glitter.

The second invention is a ceramic building board comprising fine irregularities on the design surface, and forming a metallic paint layer on the design surface side,
The metallic paint layer has a lower metallic paint layer formed on the design surface side of the ceramic building board, and an upper metallic paint layer formed thereon,
The lower metallic coating layer contains 10 to ²⁰ wt% of a scaly glittering material in the coating solid content applied at a coating amount of 15 to 25 g / m ² , and the upper metallic coating layer includes , Containing 10 to ²⁰ wt% of scaly glittering material in the solid content of the paint applied at a coating amount of 5 to 9 g / m ² ,
The glitter material contained in the upper metallic paint layer is distributed in a substantially horizontal shape with respect to the design surface of the ceramic building board (Claim 5).

The ceramic building board of the present invention is formed by forming a metallic paint layer formed by sequentially laminating a lower metallic paint layer and an upper metallic paint layer on the design surface side.
And the thickness of the lower metallic coating layer is sufficiently secured by forming the lower metallic coating layer from the coating solid content applied at a coating amount of 15 to 25 g / m ² . Further, by this, in the lower metallic paint layer, even if at least a part of the glittering material is arranged upright in a nearly vertical state, or arranged so as to enter the concave portion in the fine unevenness, A sufficient amount of glitter material is arranged on the design surface side of the ceramic building board.

Moreover, the surface of the lower metallic paint layer is formed in a substantially flat or nearly flat state by filling the concave portions of the fine irregularities with the first metallic paint.
Further, since the glitter material in the upper metallic paint layer is disposed in a substantially horizontal shape (including a state close to the horizontal) in the upper metallic paint layer, sufficient glitter is provided on the design surface of the ceramic building board. Can demonstrate its sexuality. In addition, the upper metallic paint layer is formed by the solid content of the paint applied at a coating amount of 5 to 9 g / m ² , and exhibits sufficient glitter even if it is formed thinner than the lower metallic paint layer. can do. Further, the glitter caused by the glitter material arranged in the upper metallic paint layer can be supplemented by the glitter material arranged in the lower metallic paint layer.
Therefore, the ceramic building board of the present invention can exhibit sufficient glitter on the design surface.

A preferred embodiment of the present invention described above will be described.
In the first and second inventions, the ratio of the glitter material in the solid content of the first metallic paint (second metallic paint) or the lower metallic paint layer (upper metallic paint layer) is less than 10 wt%. In some cases, the ratio of the glittering material is small, and there is a possibility that sufficient glittering property cannot be exhibited on the design surface of the ceramic building board. On the other hand, when it exceeds 20 wt%, the ratio of the glittering material is large and the ceramic industry There is a risk of increasing the production cost of the building board.
In particular, when the ratio of the glitter material in the solid content of the second metallic paint or the upper metallic paint layer exceeds 20 wt%, it is difficult to distribute the glitter material in a substantially horizontal shape.

In addition, when the coating amount of the solid coating of the lower metallic coating layer (first metallic coating) is less than 15 g / m ² , it becomes difficult to form a lower metallic coating layer having a sufficient thickness. On the other hand, if it exceeds 25 g / m ² , the production cost of the ceramic building board may be increased.
Moreover, when the coating amount of the coating solid content of the upper metallic coating layer (second metallic coating) is less than 5 g / m ² , a thickness for exhibiting sufficient glitter in the upper metallic coating layer is secured. On the other hand, when it exceeds 9 g / m ² , the production cost of the ceramic building board is increased, and it is difficult to distribute the glitter material substantially horizontally.

In the first invention, the first metallic paint is applied to the ceramic base plate moving at a speed of 20 to 70 m / min, and the second metallic paint is applied to the 20 to 70 m / min. It is preferable to carry out with respect to the ceramic base plate that moves at a speed of min (claim 2).
In this case, the first metallic paint and the second metallic paint can be applied to the ceramic base plate at high speed, and the productivity of the ceramic base plate can be improved.

The first metallic paint is applied while maintaining the temperature of the design surface of the ceramic base plate in a range of 35 to 70 ° C., and the second metallic paint is applied to the design surface of the ceramic base plate. It is preferable to carry out while maintaining the temperature of 35 to 60 ° C. (Claim 3).
In this case, the first metallic paint and the second metallic paint can be appropriately applied, and a ceramic building board with further improved glitter on the design surface can be produced.

  When the first metallic paint is applied in a state where the temperature of the ceramic base plate is less than 35 ° C., the fluidity of the first metallic paint is poor, and the glittering material in the first metallic paint is used as the ceramic building board. It becomes difficult to sufficiently distribute the surface of the design. On the other hand, when the first metallic paint is applied in a state where the temperature of the ceramic base plate exceeds 70 ° C., the solvent component in the first metallic paint may be volatilized. It is difficult to sufficiently distribute the glitter material on the design surface side of the ceramic building board.

  In addition, when the second metallic paint is applied in a state where the temperature of the ceramic base plate is less than 35 ° C., the fluidity of the second metallic paint is poor, and the glittering material in the second metallic paint is used as the ceramic material. It becomes difficult to distribute sufficiently on the design surface side of the building board. On the other hand, when the second metallic paint is applied in a state where the temperature of the ceramic base plate exceeds 60 ° C., the solvent component in the second metallic paint may be volatilized. It is difficult to sufficiently distribute the glitter material on the design surface side of the ceramic building board.

In the first aspect of the invention, it is preferable to form a clear paint layer after forming the upper metallic paint layer. In the second aspect of the invention, it is preferable that a clear paint layer is laminated on the surface of the upper metallic paint layer.
In these cases, the weather resistance of the ceramic building board can be improved by the clear paint layer formed on the design surface of the ceramic building board.

In the second invention, the thickness of the lower metallic paint layer is preferably 15 to 25 μm, and the thickness of the upper metallic paint layer is preferably 5 to 10 μm.
In this case, the thickness of the lower metallic paint layer and the thickness of the upper metallic paint layer are optimal, and a sufficient amount of glittering material is distributed in the lower metallic paint layer, and substantially in the upper metallic paint layer. It is possible to further improve the glitter on the design surface of the ceramic building board by distributing the glitter material horizontally.

When the thickness of the lower metallic coating layer is less than 15 μm, it is difficult to distribute a sufficient amount of the glittering material in the lower metallic coating layer, and when the thickness exceeds 25 μm, the lower metallic coating layer is used. There is a possibility that the thickness of the layer is large and the manufacturing cost of the ceramic building board is increased.
Further, when the thickness of the upper metallic paint layer is less than 5 μm, it becomes difficult to distribute a sufficient amount of the glittering material in the upper metallic paint layer, and when the thickness exceeds 10 μm, the upper metallic paint layer There is a risk that the manufacturing cost of ceramic building boards will increase.

In the first and second inventions, the maximum length of the glitter material is preferably 15 to 25 μm. In this case, the maximum length and thickness of the glitter material are optimized, and the glitter material can be appropriately distributed in the lower metallic paint layer and the upper metallic paint layer. A system building board can be manufactured.
When the maximum length of the glitter material is less than 15 μm, the glitter material becomes too small and it becomes difficult to exhibit sufficient glitter. On the other hand, when it exceeds 25 μm, the glitter material is large. As a result, it becomes difficult to sufficiently distribute the glitter material on the design surface side of the ceramic building board.

Below, it explains with a drawing about the example concerning the ceramic building board of the present invention, and its manufacturing method.
As shown in FIGS. 1 and 2, the manufacturing method of the ceramic building board 1 of this example is applied to the design surface 201 of the ceramic base plate 2 having the design surface 201 with the fine irregularities 21 on the base coating layer 3 and metallic. The paint layer 4 is formed, and the ceramic building board 1 is manufactured. In addition, the metallic paint layer 4 is laminated and formed as a lower metallic paint layer 41 and an upper metallic paint layer 42 in two steps.

That is, in this example, as shown in FIG. 3 and FIG. 4, the base paint 30 is applied to the design surface 201 of the ceramic base plate 2 and dried to form the base paint layer 3.
Next, as shown in FIG. 5, a first metallic paint 40 </ b> A containing 10 to 20 wt% (weight%) of the scaly glitter material 5 in the paint solid content 45 is applied on the base paint layer 3. The lower metallic paint layer 41 is formed by applying and drying so that the coating amount of the solid content 45 is 15 to 25 g / m ² .

Next, as shown in FIG. 6, on the lower metallic coating layer 41, a second metallic coating 40B containing 10 to 20 wt% of the scaly (flaky) glittering material 5 in the coating solid content 45 is provided. The upper metallic coating layer 42 is formed by coating and drying the coating solid content 45 so that the coating amount becomes 5 to 9 g / m ² .
Thereafter, as shown in FIG. 1, a clear paint 60 is applied on the upper metallic paint layer 42 and dried to form the clear paint layer 6.

Thus, as shown in FIGS. 1 and 2, the ceramic building board 1 is manufactured by forming the base coating layer 3, the lower metallic coating layer 41, the upper metallic coating layer 42, and the clear coating layer 6 on the design surface 101. Is done.
And most of the glittering material 5 contained in the lower metallic paint layer 41 stands up in a state of being substantially vertical or inclined with respect to the design surface 101 of the ceramic building board 1 or in the recess 211 in the fine unevenness 21. It is distributed in such a way. On the other hand, almost all of the glitter material 5 contained in the upper metallic paint layer 42 is distributed substantially horizontally with respect to the design surface 101 of the ceramic building board 1.
This will be described in detail below.

As shown in FIG. 3, the ceramic base plate 2 in this example is a cement-based ceramic base plate 2 containing a cementitious raw material, and the ceramic building plate 1 in this example is a cement-based ceramic base plate 1. is there.
The ceramic base plate 2 is made of a cement raw material (cement, silicic acid raw material, etc.) mixed with a wooden raw material (wood fiber, wood chip, etc.), an additive and water to make a mixed raw material. It is formed by spraying on the molding surface of the mold and drying and curing.

Moreover, the fine unevenness | corrugation 21 in the ceramics type | system | group original plate 2 is formed when the wooden raw material in a cementitious raw material exists in the design surface 201 of the ceramics type | mold original plate 2, or its vicinity. And the height difference of this fine unevenness | corrugation 21 is 0.1-200 micrometers.
In addition, various uneven | corrugated patterns can be formed in the design surface 201 of the ceramics-type original plate 2. FIG.

  As shown in FIGS. 1 and 2, the glittering material 5 contained in the first metallic paint 40A and the second metallic paint 40B of this example has a maximum length of 15 to 25 μm and a ratio of the maximum length to the thickness. The aspect ratio is 10 to 500. The glitter material 5 of this example is aluminum. Further, the glittering material 5 used in this example is formed by coating a resin on the surface of aluminum in order to ensure weather resistance, water resistance, chemical resistance, and the like.

The paint solid content 45 in the first metallic paint 40A and the second metallic paint 40B is obtained by adding the glitter material 5, the color pigment, the matting agent and various additives to the clear resin. Examples of the additive include a modifier, an ultraviolet adsorbent, and a dispersant.
The color pigment may have a black color such as carbon black, a yellow color such as chrome yellow, and a red color such as iron oxide. Also, these black, yellow and red color pigments can be prepared and used.
The glitter material 5 may be pearl, mica, titanium-coated mica (silver), muscovite, synthetic mica, interference mica, or the like.

The first metallic paint 40A and the second metallic paint 40B are composed of the paint solid content 45 and a solvent component.
Further, the first metallic paint 40 </ b> A and the second metallic paint 40 </ b> B of this example are made of the same paint containing the glitter material 5.

Next, the manufacturing method of the ceramic building board 1 of this example will be described in detail.
In the manufacturing method of the ceramic building board 1 of this example, as shown in FIG. 7, preheating, base coating, first drying, lower metallic coating, second drying, upper metallic coating, third drying, clear coating, first 4 Perform the drying and cooling steps to coat the ceramic base plate 2. In each step, a plurality of ceramic base plates 2 are sequentially transported by a transporting device such as a conveyor, and ceramic ceramic building plates 1 are continuously produced.

Specifically, in the preheating step (step S101 in FIG. 7), the ceramic base plate 2 is heated with hot air of about 240 ° C., and then in the base coating step (S102), the ceramic industry is divided into two times. The base coating 30 is applied to the design surface 201 of the system original plate 2.
Next, in the first drying step (S103), the ceramic base plate 2 is heated with hot air of about 100 ° C. to dry the base coating layer 3 formed on the design surface 201 of the ceramic base plate 2. Thus, as shown in FIG. 4, the base coating layer 3 having a thickness of about 20 μm is formed by the coating solid content 45.

Next, in the lower metallic coating step (S104), the ceramic base plate 2 is moved at a speed of about 48 m / min, and the first jet nozzle 71 is placed on the base coating layer 3 in the moving ceramic base plate 2. The first metallic paint 40A is ejected from the first to paint.
In the lower metallic coating step, the ceramic base plate 2 is heated using a dryer 73A, and the temperature of the design surface 201 is set to about 50 ° C., and then the first metallic coating 40A is applied (see FIG. 8). ).

The first metallic paint 40A contains 10 to 20 wt% of the scaly glittering material 5 in the paint solid content 45, and the design surface 201 side of the ceramic-based original plate 2 by the first jet nozzle 71. The coating is applied so that the coating amount of the paint solid content 45 is 15 to 25 g / m ² .
Further, as shown in FIG. 8, the first metallic paint 40A is applied by conveying the ceramic base plate 2 to the dryer 73A and the first jet nozzle 71 by the transport conveyor 74A. In addition, FIG. 8 is explanatory drawing which shows the principal part of the manufacturing apparatus 7 of the ceramics-type building board 1. FIG.

  As shown in FIG. 5, at the design surface 201 side of the ceramic base plate 2, at least a part of the glitter material 5 in the first metallic paint 40 </ b> A is erected in a state close to vertical or inclined. It is arranged in the side metallic paint layer 41. Further, at least a part of the glitter material 5 is disposed in the lower metallic paint layer 41 so as to enter the concave portion 211 in the fine irregularities 21 formed on the design surface 201 of the ceramic base plate 2.

As described above, the coating amount of the coating solid content 45 of the first metallic coating 40A is 15 to 25 g / m ² , and even if the glittering material 5 stands up or enters the recess 211 in the fine unevenness 21, The thickness of the lower metallic paint layer 41 can be sufficiently secured, and the glittering material 5 can be sufficiently distributed on the design surface 201 side of the ceramic base plate 2.
Further, the concave portion 211 in the fine unevenness 21 is filled with the first metallic paint 40A, and the surface of the lower metallic paint layer 41 can be formed in a substantially flat shape or a nearly flat state.

Further, the coating of the first metallic paint 40A of this example is performed by airless spray painting in which the paint is sprayed in a high pressure state. Therefore, it is easy to form the lower metallic paint layer 41 thick on the base paint layer 3.
The coating of the first metallic paint 40A can also be performed by a flow coater or the like that conveys and applies the ceramic base plate 2 to the paint that flows down.

Next, in the second drying step (S105), the ceramic base plate 2 is heated by hot air of about 100 ° C. from the dryer 73B, and the lower metallic coating layer is applied to the design surface 201 side of the ceramic base plate 2 41 is dried (see FIG. 8). The lower metallic paint layer 41 may be dried by touch drying for drying the paint in a semi-cured state or by complete drying for drying the paint almost completely.
Thus, the lower metallic paint layer 41 having a thickness of 17 to 23 μm is formed on the design surface 201 side of the ceramic base plate 2 by the paint solid content 45 in the first metallic paint 40A.

Next, in the upper metallic coating step (S106), the ceramic base plate 2 is moved at a speed of 35 to 38 m / min, and the second jet is ejected onto the lower metallic coating layer 41 in the moving ceramic base plate 2. The second metallic paint 40B is ejected from the nozzle 72 to perform painting.
In the upper metallic coating step, the temperature of the design surface 201 of the ceramic base plate 2 heated by the dryer 73B is set to about 45 ° C., and then the second metallic coating 40B is applied.
Note that the temperature of the ceramic base plate 2 when the second metallic paint 40B is applied is slightly lower than the temperature of the ceramic base plate 2 when the first metallic paint 40A is applied.

The second metallic paint 40B is the same as the first metallic paint 40A, that is, contains 10 to 20 wt% of the scaly glittering material 5 in the paint solid content 45, and is formed by the second ejection nozzle 72. Then, coating is performed so that the coating amount of the paint solid content 45 on the design surface 201 side of the ceramic base plate 2 is 5 to 9 g / m ² .
Further, as shown in FIG. 8, the coating of the second metallic paint 40B is performed by transporting the ceramic base plate 2 to the second ejection nozzle 72 by the transport conveyor 74B.

  Then, as shown in FIG. 6, the glittering material 5 in the second metallic paint 40B is disposed on the surface of the lower metallic paint layer 41 formed in the substantially flat shape or in a nearly flat state. Therefore, the glittering material 5 in the second metallic paint 40B is arranged in a substantially horizontal shape (including a state close to the horizontal) in the upper metallic paint layer 42.

Therefore, as described above, even if the coating amount of the coating solid content 45 of the second metallic paint 40B is 5 to 9 g / m ^{2 which} is less than that of the first metallic paint 40A, The glitter material 5 arranged substantially horizontally in the metallic paint layer 42 can exhibit sufficient glitter. Further, the glitter by the glitter material 5 arranged in the upper metallic paint layer 42 can be supplemented by the glitter material 5 arranged in the lower metallic paint layer 41.

  Further, the coating of the second metallic paint 40B of this example is performed by air spray painting in which the paint is sprayed using compressed air. Therefore, it is easy to make the coating amount of the second metallic paint 40B smaller than the coating amount of the first metallic paint 40A, and the coating amount of the second metallic paint 40B can be controlled as accurately as possible.

  Further, as shown in FIG. 6, the glittering material 5 in the upper metallic paint layer 42 could be distributed substantially horizontally over almost the entire area of the upper metallic paint layer 42. As shown in FIG. 2, the distribution area of the glitter material 5 in the upper metallic paint layer 42 can be 80 to 100% of the total area of the upper metallic paint layer 42.

Thus, as shown in FIG. 6, the upper metallic coating layer 42 having a thickness of 5 to 9 μm is formed on the design surface 201 side of the ceramic base plate 2 by the coating solid content 45 in the second metallic coating 40B.
Next, in the third drying step (S107), the ceramic base plate 2 is heated using a dryer so that the temperature is about 120 ° C., and the upper metallic paint is applied to the design surface 201 side of the ceramic base plate 2 Layer 42 is dried.

Next, in the clear coating step (S108), the clear paint 60 is applied on the upper metallic paint layer 42 in the ceramic base plate 2.
Thereafter, in the fourth drying step (S109), the ceramic base plate 2 is heated using a dryer so that the temperature is about 100 ° C., and the clear coating layer formed on the design surface 201 side of the ceramic base plate 2 6 is dried. As shown in FIG. 1, a clear paint layer 6 having a thickness of about 20 μm is formed by the paint solid content 45. Then, in the cooling step (S110), the ceramic base plate 2 was cooled.

  Thus, according to the manufacturing method of this example, as shown in FIGS. 1 and 2, the base coating layer 3, the lower metallic coating layer 41, and the upper metallic coating layer 42 are formed on the design surface 201 side of the ceramic base plate 2. And the ceramics building board 1 which forms the clear coating layer 6 and can exhibit sufficient glitter can be manufactured.

FIG. 2 is an enlarged view showing the design appearance on the design surface 101 of the ceramic building board 1. In the figure, the glitter material 5B in the upper metallic paint layer 42 is distributed in an area of 80 to 100% with respect to the entire area of the design surface 101 of the ceramic building board 1, and most of the design appearance is the upper side. It is formed by the glitter material 5B in the metallic paint layer 42. Further, from the gap between the glitter materials 5A in the upper metallic paint layer 42, there is a portion where the color due to the colored pigment in the glitter material 5A in the lower metallic paint layer 41 or the paint solid content 45 can be seen.
And the design surface 101 of the ceramics-type building board 1 can exhibit sufficient glitter by distribution of such glittering material 5A, B. FIG.
FIG. 2 is a schematic diagram, and the design appearance on the design surface 101 of the actual ceramic building board 1 may be slightly different.

Moreover, it was confirmed that the ceramic building board 1 manufactured in this example can keep the temperature low by the metallic paint layer 4 formed on the design surface 101.
That is, in FIG. 9, a ceramic building board 1 (invention) in which a metallic paint layer 4 having a silver color is formed and a ceramic building board (comparative product) in which a metallic paint layer is not formed are respectively constructed. The result of having measured the temperature change in the back surface (surface on the opposite side to the design surface 101) of each ceramics-type building board 1 when constructing as an outer wall is shown. In the figure, the horizontal axis represents time (H), and the vertical axis represents the temperature (° C.) on the back surface of the ceramic building board.
Moreover, about the invention goods, the measurement date was changed and it measured twice, and about the comparison goods, it measured about the ceramic industry building board 1 which has the color of brown (a) and white (b), respectively.

From the above results, the temperature on the back surface of the ceramic building board 1 (invention product) on which the metallic paint layer 4 is formed is approximately compared to the temperature on the back surface of the ceramic building board (comparative product) in which the metallic paint layer is not formed. It was found to be extremely low at 50-60 ° C. In addition, as a result of measuring the temperature on the design surface 101 of the ceramic building board 1 of the inventive product and the ceramic building board of the comparative product, the comparative product was about 115 ° C., whereas the invention product was about 115 ° C. It was 60 ° C.
From these facts, it was found that the ceramic building board 1 of the invention is less heated by sunlight and has a large effect of preventing the temperature of the ceramic building board 1 from rising.

Cross-sectional explanatory drawing which expands and shows the principal part of the ceramic industry building board in an Example. The top view which expands and shows the design surface of the ceramics-type building board in an Example. Cross-sectional explanatory drawing which shows the ceramics type | system | group original plate in an Example. Cross-sectional explanatory drawing which shows the state in which the foundation coating layer was formed in the design surface of the ceramics type | system | group original plate in an Example. Cross-sectional explanatory drawing which shows the state in which the lower metallic coating layer was formed on the base coating layer of the ceramics type | system | group original board in an Example. Cross-sectional explanatory drawing which shows the state which formed the upper metallic coating layer on the lower metallic coating layer of the ceramics type | system | group original plate in an Example. The flowchart which shows the manufacturing method of the ceramic industry building board in an Example. Explanatory drawing which shows the principal part of the manufacturing apparatus of the ceramic industry building board in an Example. The graph which shows the result of having measured the temperature (degreeC) in the back surface of a ceramic building board according to the time (H) on a horizontal axis in an Example, and having measured the temperature (degreeC) in the back surface of a ceramic building board.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ceramics-based building board 101 Design surface 2 Ceramics-based original board 201 Design surface 21 Fine unevenness 211 Recessed part 3 Undercoat paint layer 4 Metallic paint layer 41 Lower metallic paint layer 42 Upper metallic paint layer 40A 1st metallic paint 40B 2nd metallic paint 45 Paint solids 5 Bright material 6 Clear paint layer

Claims (7)

A method of manufacturing a ceramic building board by forming a metallic paint layer on the design surface side of the ceramic base plate having a design surface with fine irregularities,
On the design surface side of the ceramic base plate, a first metallic paint containing a scale-like glittering material in an amount of 10 to 20 wt% in the solid content of the paint, the coating amount of the paint solid content is 15 to 25 g / m ^2. Paint and dry to form a lower metallic paint layer,
Next, on the lower metallic paint layer, a second metallic paint comprising 10 to 20 wt% of a scaly glittering material in the solid content of the paint, the coating amount of the paint solid content is 5 to 9 g / A method for producing a ceramic building board, wherein the upper metallic paint layer is formed by painting and drying to m ² .   The coating of the first metallic paint is performed on the ceramic base plate moving at a speed of 20 to 70 m / min, and the coating of the second metallic paint is performed at a speed of 20 to 70 m / min. A method for producing a ceramic building board, which is performed on the moving ceramic board.   3. The coating of the first metallic paint according to claim 1 or 2, wherein the temperature of the design surface of the ceramic base plate is maintained in a range of 35 to 70 ° C., and the coating of the second metallic paint is performed by the ceramic industry. A method for producing a ceramic building board, characterized in that it is carried out while maintaining the temperature of the design surface of the base plate in a range of 35 to 60 ° C.   The method for manufacturing a ceramic building board according to any one of claims 1 to 3, wherein a clear paint layer is formed after the upper metallic paint layer is formed. A ceramic building board comprising fine irregularities on the design surface and a metallic paint layer formed on the design surface,
The metallic paint layer has a lower metallic paint layer formed on the design surface side of the ceramic building board, and an upper metallic paint layer formed thereon,
The lower metallic coating layer contains 10 to ²⁰ wt% of a scaly glittering material in the coating solid content applied at a coating amount of 15 to 25 g / m ² , and the upper metallic coating layer includes , Containing 10 to ²⁰ wt% of scaly glittering material in the solid content of the paint applied at a coating amount of 5 to 9 g / m ² ,
The said luster material contained in the said upper side metallic coating layer is distributed substantially horizontal with respect to the design surface of the said ceramics type architectural board, The ceramics type architectural board characterized by the above-mentioned.   6. The ceramic building board according to claim 5, wherein the lower metallic paint layer has a thickness of 15 to 25 [mu] m, and the upper metallic paint layer has a thickness of 5 to 10 [mu] m.   The ceramic building board according to claim 5 or 6, wherein a clear paint layer is laminated on a surface of the upper metallic paint layer.

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