JPH0226671A - Preparation of building panel - Google Patents

Abstract

PURPOSE:To enhance appearance by applying base coat having hiding power to a base plate and further applying paint having hiding power in a spotlike pattern and subsequently applying paint low in hiding power in a spotlike pattern and finally applying clear paint. CONSTITUTION:Base coat 2 forming a film having the same color as a natural stone expressed by paint having hiding power is formed to the surface of a base plate 1 and paint having hiding power is subsequently applied to the base coat 2 in a spotlike pattern to form the first pattern coat 3. Next, paint low in hiding power is applied to the base coat 2 in a spotlike pattern to form the second pattern coat 4. Then, clear paint is applied to the pattern coats to form top coat 5. By this method, a product having good appearance is obtained.

Description

[Detailed Description of the Invention] r Industrial Field of Application 1 The present invention relates to a method for manufacturing architectural boards that express the appearance of natural stone, and more specifically to a method for forming surface lateral patterns of natural stone, particularly granite patterns. .

[Prior Art] In recent years, natural stone has been used as a building material due to its luxurious appearance.

[Problem to be Solved by the Invention 1] However, when natural stone is used as a building material, it has disadvantages such as being expensive, heavy, easily broken, and difficult to construct. For this reason, the most widely used method for obtaining building boards with natural stone patterns is to print on the base material surface, but it has the following drawbacks.

■ Plate making and printing require time and expense.

■There are no variations in the pattern seen with natural stone, and only a uniform pattern can be expressed (only the same pattern is printed).

■If you want to change the pattern, you need many plates.

■Large sizes are not possible because only plate-sized pieces can be produced.

■In recent years, natural stone patterns have been expressed by painting to overcome the drawbacks of printed printing boards, which cannot be used with substrates that have embossments.

The method of painting is to spray the paint with a spray gun,
The method of adding a pattern is widely used, but it has the following drawbacks.

0 It has the disadvantage that the appearance of the surface is poor due to dust adhering to the surface and air bubbles remaining on the coating film.

■Even if a top coat of clear paint is applied after forming a pattern on a flat base material, the unevenness of the pattern will cause minute irregularities on the surface of the top coat of clear paint, making it impossible to obtain the appearance of a polished surface of natural stone.

The present invention has been made in view of the above points, and an object of the present invention is to obtain a building board having a natural stone pattern, particularly a granite pattern, used for the interior and exterior, and furthermore, The object of the present invention is to provide a method for manufacturing a building board by which a good building board can be obtained.

[Measures for solving the problem Fj,] In order to achieve the above object, the method for manufacturing a construction board of the present invention is as follows:
A base coat 2 of a paint with hiding properties is applied on a substrate 1 with a smooth surface, and then the paint with hiding properties is applied in spots to form a first pattern coat 3, and at the same time, a paint with low hiding properties is applied in spots. to form a second pattern coat 4,
A top foot 5 of clear paint is formed on this, and the surface of the top coat 5 is polished to a smooth finish.

[Action 1: Apply base coat 2, v & 1 pattern coat 3, second pattern coat 4 and top coat 5 to base material 1 in sequence, and apply top coat 5 to base material 1.
By polishing the surface, it is possible to obtain a building board with a non-uniform natural stone pattern, especially a granite pattern, and also with a good appearance.

[Example 1] The substrate 1 has a smooth surface, and the material used is a calcium silicate board, an asbestos cement board, a gypsum slag board, a gypsum board, an FRP board, a plywood board, a wood board, etc. On the surface of this substrate 1, a base coat 2 is formed using a concealing paint to form a coating film of the same color as the natural stone expressed. As a coating method for applying the base coat 2, a roll coater 170-coater, spray coating, etc. may be used alone or in combination. The material for the base coat 2 is, for example, urethane enamel paint. Next, a concealing paint is applied in spots on this base coat 2 to form a first pattern coat 3. This first pattern coat 3 completely hides the base coat 2 in the thick part where it is applied, and the base coat 2 in the thin part.
The color has the effect of changing the remaining colors. This first
A urethane-based enamel paint is used as a paint for pattern coat 3. After the first pattern coat 3 is applied, a second pattern coat 4 is applied by applying a color paint with low hiding power in spots on the base coat 2. This second pattern coat 4 has the effect of expressing a subtle color change due to the difference in film thickness of the coated portion. The paint used for the second pattern coat 4 is color clear paint (colored clear paint).
etc.

Furthermore, since the PIS 2 pattern coat 4 is applied on the first pattern foot 3, the color change becomes even more effective. In addition, since both the first pattern coat 3 and the second pattern coat 4 are applied multiple times during painting, overlapping portions can be made more randomly, and subtle colors with more overlap can be expressed. Natural stone patterns have a subtle mixture of many colors, and the more colors there are in the pattern coat, the better the reproducibility will be, but if there are too many colors, problems will occur, such as an increase in the number of coats and difficulty in pattern reproducibility. However, two to three colors are appropriate for the patterned coat.

Another feature of the present invention is that subtle patterns (colors) can be expressed with a small number of patterned coats. Match the color of the pattern coat to the same color as the natural stone. After applying the T51 pattern coat 3 and the ttS2 pattern coat 4 on the base coat 2 in this manner, a top coat 5 is formed by applying a clear paint on the pattern coat in order to bring out the depth of natural stone. In other words, the deep transparency of natural stone cannot be expressed with the pattern coat alone, and applying the top coat 5 of clear paint to the pattern coat has the effect of expressing a sense of depth. The clear paint to which the top coat 5 is applied is, for example, a urethane-based clear paint. By the way, when the top coat 5 is applied, as shown in Fig. 2, foreign matter 6 adheres to the painted surface and air bubbles 7 are mixed in, making it impossible to obtain a good appearance with just painting, and the unevenness of the pattern coat. This causes a problem in that minute irregularities are formed on the surface of the top foot 5, and a smooth surface obtained by polishing natural stone cannot be obtained. To solve this problem, the surface of the top coat 5 is polished to make it smooth as shown in FIG. 3, thereby improving the depth of the top coat 5 made of clear paint. To effectively create depth, increase the thickness of the top foot 5 of the clear paint (it is more effective if you apply the clear paint multiple times, and polishing can be done after each coat of clear paint. It is also possible to apply only the surface layer after performing the process multiple times.

[Effects of the Invention] As described above, the present invention applies a base coat of a concealing paint on a substrate with a smooth surface, and then applies the concealing paint in spots to form a first pattern coat and conceal the base coat. Since the second pattern coat is formed by applying a paint with low viscosity in spots, and a top coat of clear paint is formed on top of this, there is no uniformity that cannot be expressed with the printing method (a moderate amount of pattern coating can be achieved by applying a pattern coat). A large amount of variation occurs,
All of them have slightly different patterns) Natural stone, especially architectural boards that express granite patterns, can be obtained, and the top coat surface is polished to a smooth finish.
It can remove air bubbles and foreign matter and improve the appearance.
Furthermore, by polishing, the surface smoothness can be improved and the appearance can be brought closer to the polished appearance of natural stone, further improving the appearance.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an example of a building board obtained by the method for manufacturing a building board of the present invention, FIG. 2 is a cross-sectional view showing the same state before the top coat is polished, and FIG. 3 is the same as above. 1 is a cross-sectional view showing the state of the top coat after polishing,
is a substrate, 2 is a base coat, 3 is a first pattern coat, 4 is a second pattern coat, and 5 is a top coat. Agent Patent Attorney Ishi 1) Ai Shichi

Claims (1)

[Claims] [1] A base coat of a paint with hiding properties is applied on a substrate with a smooth surface, and then the paint with hiding properties is applied in spots to form the first pattern coat, and a paint with low hiding properties is applied in spots. A method for manufacturing an architectural board, which comprises applying a second pattern coat, forming a top coat of clear paint on top of the second pattern coat, and polishing the surface of the top coat to give a smooth finish.