JP4231133B2 - Inorganic ceramic decorative veneer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, on a base material made of an inorganic ceramic board, a single layer or a plurality of decorative coating layers are formed by a water-based coating after direct or ground treatment, and an ultraviolet curable clear ( An object of the present invention is to provide a decorative board formed with a clear layer formed by “UV clear”) that does not cause cracks or the like in the formed clear layer.
[0002]
[Prior art]
Inorganic ceramics decorative panels made by painting inorganic ceramics are widely used in fields such as interior and exterior building materials. Organic solvent-based paints were the mainstream paint used in conventional ceramic ceramic decorative panels. However, there are problems such as the working environment during production and VOC (volatile organic compound) problems of products. Is increasing. However, when a water-based paint is used, there is a problem that mold is easily generated as compared with an organic solvent-based paint. Therefore, there is a case where a top clear layer is further provided on the decorative coating layer for the purpose of protecting the cosmetic coating layer including anti-mold and improving the appearance. However, the use of UV clear containing no organic solvent is also used for the top clear. It has increased. However, when a decorative board is produced by forming a decorative paint film layer with a water-based paint on an inorganic ceramic base material and then applying a top coat with UV clear, a problem is that the top clear layer tends to crack. was there. For the purpose of improving the design of the decorative board, a translucent UV color clear containing a coloring pigment in the UV clear may be used as the top clear, but the top clear is the same as in the case of a normal UV clear. There was a problem that the clear layer was easily cracked.
[0003]
[Problems to be solved by the invention]
That is, an object of the present invention is to provide a cosmetic that does not cause cracking in the formed top clear layer without using an organic solvent when forming a decorative coating layer and a top clear layer on a substrate made of an inorganic ceramic board. To provide a board.
[0004]
[Means for Solving the Problems]
On a substrate made of inorganic ceramic plate, after impregnating sealer primed surface of the base material, a water-based coating material is applied to form a decorative coating layer by curing and film formation so, then the decorative coating layer In an inorganic ceramics decorative board formed by applying a UV clear to the substrate and irradiating with ultraviolet rays to cure and form the UV clear to form a clear layer, the hardness difference between the clear layer and the decorative coating layer is It includes a configuration in which the hardness is within 3H, and includes a configuration in which the UV clear is a color clear and a configuration in which an uneven portion is formed on the surface of the substrate.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
The inorganic ceramic board used in the present invention is a plate-like molded body mainly composed of an inorganic bindery and an inorganic or organic reinforcing material, such as a fiber reinforced cement board, a wood chip cement board, a calcium silicate board, and a gypsum board. It is. Further, the surface of the inorganic ceramic board is smooth or provided with a concavo-convex pattern, and ground treatment such as polishing and / or impregnation sealer treatment is performed as necessary.
[0006]
The water-based paint used in the present invention is not particularly limited as long as it is suitable for an inorganic ceramic base material. Moreover, the coating method of the water-based paint is not particularly limited, and a known coating method such as a flow coater, a roll coater, or a spray can be used. Further, the coating amount of the water-based paint and the film thickness after film formation are not particularly limited, but generally the coating amount is 110 g / m ^{2 to} 130 g / m ² , and the film thickness after film formation is 30 μm. ˜40 μm is preferred. Application of the water-based paint may be performed once, or may be repeated a plurality of times. In the case where the coating is performed a plurality of times, the water-based paint may be cured / film-formed after the coating is performed a plurality of times, or the coating and curing / film-forming steps may be repeated.
[0007]
The UV clear used in the present invention is a transparent resin paint that is cured by irradiating ultraviolet rays, or a translucent resin paint that contains a color pigment in a transparent resin paint called UV color clear. The UV clear coating method is not particularly limited, and is a known method such as a flow coater, roll coater, spray, or the like, or the present inventor proposed in Japanese Patent Application No. 9-164016 to form a top clear layer. Can be applied on the surface protective material in the form of a film, and the applied ultraviolet curable resin paint can be bonded to the decorative paint film layer made of water-based paint on the substrate. . The applied UV clear is cured by ultraviolet irradiation to form a top clear layer. The coating amount of UV clear and the film thickness after film formation are not particularly limited, but generally the coating amount is 70 g / m ^{2 to} 150 g / m ² , and the film thickness after film formation is 35 μm to 150 μm. Is preferred. For the purpose of the present invention, it is desirable that the UV clear does not contain an organic solvent.
[0008]
Regarding the water-based paint and UV clear used in the present invention, it is important that the difference in hardness between the two when cured and film-formed after coating is within 3H, more preferably within 2H. That is, if the hardness difference between the two exceeds 3H, the top clear layer of the manufactured inorganic ceramics decorative board tends to crack, but by making the hardness difference within 3H greatly increases the risk of cracking. This is because, by further reducing the difference in hardness between the two to 2H or less, the occurrence of cracks in the top clear layer can be substantially prevented under normal use conditions.
[0009]
【Example】
(Example)
As an inorganic ceramic board, a substrate of “Ask Superior Siding Kabeban” having a thickness of 12 mm and a stucco-like uneven pattern on the surface was used. As a base treatment, 30 g / m ^{2 of an} epoxy-based impregnated sealer manufactured by Nippon Paint Co., Ltd. was applied and cured. A water-based paint manufactured by Nippon Paint Co., Ltd. (trade name: odeite UV base coat) is applied at 120 g / m ² by a flow coater on the base-treated substrate, followed by heating at an atmospheric temperature of 110 ° C. for 3 minutes. To form a decorative coating layer. The pencil hardness of the formed decorative coating layer was H. On this decorative coating layer, a UV clear (trade name Ubicoat 60) manufactured by Nippon Paint Co., Ltd. was applied with a flow coater at 120 g / m ² , and after application, the UV clear was cured by curing the UV clear layer. An inorganic ceramics decorative board was obtained. The pencil hardness of the formed top clear layer was 3H, and the hardness difference between the top clear layer and the decorative coating layer was 2H. The obtained decorative board was subjected to a warm water test in which it was immersed in warm water at 60 ° C. for 240 hours as an accelerated durability test. As a result, no crack was observed in the top clear layer, and no deterioration was observed in the coating film performance described in JIS-K-5400.
[0010]
(Comparative example)
To Example the same substrate and base material subjected to the same surface treatment, Nippon Paint Co., Ltd. aqueous coating (trade name Eau tight) 120 g / m ² coated by flow coater, coating after ambient temperature 110 A film was formed by heating at 3 ° C. for 3 minutes to form a decorative coating layer. The pencil hardness of the formed decorative coating layer was B. On this decorative coating layer, a UV clear (trade name Ubicoat 60) manufactured by Nippon Paint Co., Ltd. was applied with a flow coater at 120 g / m ² , and after application, the UV clear was cured by curing the UV clear layer. An inorganic ceramics decorative board was obtained. The pencil hardness of the formed top clear layer was 3H, and the difference in hardness between the top clear layer and the decorative coating layer was 4H. The same accelerated durability test as that of the example was performed on the obtained decorative board. As a result, cracks occurred in the top clear layer, and it was obvious that the coating performance described in JIS-K-5400 was also deteriorated.
[0011]
【The invention's effect】
The inorganic ceramics decorative board obtained by the present invention is a decorative board having a decorative paint film layer made of water-based paint and a top clear layer made of UV clear on a base material made of an inorganic ceramics board, using an organic solvent. It is a decorative board that does not cause cracks in the formed top clear layer.

Claims (3)

After applying an impregnated sealer base treatment to the base material composed of an inorganic ceramic board, a water-based paint is applied, and this is cured and formed into a decorative paint film layer. In an inorganic ceramics type decorative board formed by applying an ultraviolet curable clear, which is a resin paint, to the clear, irradiating the clear with ultraviolet rays, and curing and forming the ultraviolet curable clear to form a clear layer. An inorganic ceramics decorative board characterized in that the hardness difference between the coating film layer and the decorative coating layer is 3H or less in pencil hardness.   2. The inorganic ceramics decorative board according to claim 1, wherein the ultraviolet curable clear is a color clear.   3. An inorganic ceramics decorative board according to claim 1 or 2, wherein an uneven portion is formed on the surface of the substrate.