JPH02203968A - Coating method - Google Patents

Abstract

PURPOSE:To form a cracking-like pattern by forming an under-coat layer on a base material and furthermore applying a cracking coating agent to generate cracking-like pattern and then forming a protective layer thereon. CONSTITUTION:Resin such as epoxy-based resin is applied to a base material 1 to form an under-coat layer 2 having 15-500mum thickness. Then a cracking coating agent is applied to the under coat layer 2 to form a cracking film 3. After this cracking film 3 is dried, a transparent or translucent protective layer 4 is formed thereon. The cracking coating agent has such properties that it is swelled by a solvent and contracted at a time for drying it and thereby a cracking is generated. For example, a contracting adjuvant such as aluminum stearate is blended with urethane resin, etc. Thereby high surface glossy properties can be imparted.

Description

[Detailed Description of the Invention] [Field of Application of Industry-1-] The present invention relates to a coating method applied to building materials such as furniture, walls, floors, etc., and particularly enables coating with a new appearance.

[Prior Art] One of the conventionally known coating methods that utilizes the cracking phenomenon of coating materials is to use coating materials that tend to cause cracking due to shrinkage during drying and coating materials that do not. There is a method of forming a crack pattern by sequentially applying different types of coating films, drying them, and causing cranking to occur only in the coating film of 11 "j".

[Problems to be Solved by the Invention] However, with this method, the disadvantage is that the coating film exhibits a leather-like texture and lacks gloss and texture. There was also the inconvenience that it was not possible to perform composite decoration with a printed pattern provided on the base material or the surface of the base material.

Therefore, the present invention solves the above-mentioned problems, and provides a coating method that makes use of the texture of the base material or the pattern on the rough surface, and provides a coating film with a new appearance that expresses the pattern of Crab King. The aim is to provide the following.

Means for Solving 1 Problem] The present invention forms a transparent or translucent undercoat layer on a base material, further coats a cracking paint on this undercoat layer to form a cracked paint film, and then The solution was to dry the cracked coating to generate crabbing, and then to form a transparent or translucent protective layer on the cracked coating.

Hereinafter, the present invention will be explained in detail using the drawings.

1 to 5 are process diagrams showing an example of the coating method of the present invention.

The reference numeral 1 in the figure is the base material. First, a transparent or translucent undercoat layer 2 is formed on this base material 1.

Here, the base material l is a decorative veneer made of natural wood board, artificial wood board, etc., lined with a backing material such as non-woven fabric, or a decorative veneer is pasted onto a wood board, plywood, wood cement board, etc. Wood-based materials such as decorative plywood, lauan plywood, and particle board, resin-based materials such as fiber-reinforced synthetic resin boards, and metal-based materials such as aluminum sheets and stainless steel sheets are used. Although not limited, those having a diameter of about 0.8 to 50 mm are usually used. Here, the surface of the base material 1 may be ground or cut in advance, and if necessary, it may be colored with a suitable color by applying a coloring agent or the like, or a pattern may not be formed by a suitable printing method. You may also make decorations such as Here the above grinding #
Sandpaper of about 180 to #400 is used,
For coloring, dyes and pigments dissolved in a solvent, or a small amount of resin, such as polyurethane resin, etc. dissolved therein are preferably used, and for printing,
Methods such as gravure printing, screen printing, and offset printing are used. Further, when a metal material is used as the base material 1, it is preferable to use a material that has been previously subjected to surface treatment such as degreasing treatment or phosphate treatment in order to improve adhesiveness.

The undercoat layer 2 may be made of, for example, epoxy resin, unsaturated polyester resin, acrylic resin, polyurethane resin, diallyl phthalate resin, silicone resin, phenol resin, vinyl chloride resin, polypropylene resin, acrylic silicone, etc. fluorocarbon resins, fluororesins, and mixtures thereof are preferably used, but other transparent or translucent resins may be used without any problem. Also, if necessary,
It can also be used as a colored transparent or colored translucent resin by blending an appropriate coloring agent. In addition, this resin has
Additives such as light stabilizers, antioxidants, and crosslinking agents may be added as appropriate.

Then, these transparent or translucent resins are applied onto the base material 1 to form an undercoat layer 2 having a thickness of approximately 15 to 500 μm. The coating method is not particularly limited, but a roll coater, spin coater, flow coater, electrostatic spray, or brush coating method is preferably used.

Next, as shown in FIG. 2, on the undercoat layer 2,
Crab King paint is applied to form a cracked paint film 3. Here, the above-mentioned cracking coating refers to a coating that swells with a solvent and shrinks when drying, causing cracking. A resin composition containing a shrinkage aid is preferably used. As the shrinkage aid, aluminum stearate or the like is suitably used, and the amount thereof is about 10 to 50 parts by weight per 100 parts by weight of the resin. In addition, when applying this cracking coating, the resin, shrinkage aid, and solvent such as methyl isobutyl ketone or xylene are mixed in predetermined amounts in advance to swell the resin and improve the handling properties of the coating. It is preferable to keep it in good condition. And this paint,
Coating is performed using a brush coating, a roll coater, a spin coater, etc. to a film thickness of about 5 to 100 μm.

By controlling the film thickness, it is possible to control the line width of cracks that will later occur in the cracked coating film. Specifically, by decreasing the film thickness, the line width of the crack can be decreased, and by increasing the film thickness, the line width of the crack can be increased.

Next, the previously formed cracked coating film 3 is dried. The drying method is not particularly limited, but it is preferable to use an oven heated to about 50° C., an infrared irradiation device, or the like.

Due to such drying, as shown in FIG. 3, the crank coating film 3 undergoes curing shrinkage and cracking occurs. The cracked coating film 3 exhibits an uneven pattern due to the cracks that appear as a result of this cracking, and in these cracked areas (intervening areas), the undercoat layer 2
The base material 1 can be seen through it.

Next, a transparent or translucent protective layer 4 is formed on this cracked coating film 3. This protective layer 4 may be applied to take advantage of the unevenness of the cracked coating film 3 as shown in FIG. 4, or it may be applied to completely fill in the unevenness to form a flat surface as shown in FIG. It may be applied as shown. In either case, by forming the protective layer 4, the cracked coating film 3
It is possible to protect the uneven pattern of the cracked coating film 3 and avoid scratches and destruction caused by impact, etc., and to give surface gloss to the cracked coating film 3.

Furthermore, the surface of the protective layer 4 can be ground and polished to make the surface smooth, or it can be given a mirror finish to further enhance the surface gloss.

In the paint film obtained by the above-described painting method, the base material 1 is visible through the transparent undercoat layer 2 at the crevices (intermediate parts) of the cracks that occur in the cracked paint film 3. . Since the different color tones of the base material 1 and the cracked coating film 3 appear as they change continuously, you can enjoy two types of textures at the same time and enjoy a new cracking pattern that has never been seen before. Can be done.

[Example] (Example 1) A 30+ nm thick plywood made by bonding 0.6 mm thick bird's eye maple sheets together was used as a base material, and urethane resin clear was applied to it to a thickness of 20 μm. did.

Next, while the previously applied urethane resin clear was in an uncured state, a cracking paint containing a shrinkage aid was applied to form a cracked paint film with a thickness of 30 μM. Here, the above cracking paint is urethane resin enamel (
black) 100 parts by weight, 30 parts by weight of aluminum stearate
Adjustments were made by adding parts by weight.

Next, this cracked coating film was dried at room temperature for 16 hours to shrink the cracked coating film and cause cracking to occur.

Further, a urethane resin clear was applied to a thickness of 20 μm on the cracked coating film, and then dried at room temperature for 16 hours to form a protective layer.

According to this coating method, it is possible to obtain a wood decorative material that has a fine rack pattern and a new appearance with the real skin of the underlying bird's eye maple visible through the cracks. Ta.

(Example 2) A wood decorative material was produced in the same manner as in Example 1, except that the drying conditions for the cracked coating were 50°C and 120 minutes.

In the wood decorative material obtained in this way, the size of each crack is large and the line width is also large,
It exhibited a crack pattern with a different atmosphere from the appearance of Example 1.

(Example 3) An unsaturated polyester resin was further coated to a thickness of 500 μm on the wood decorative material obtained in Example 1, dried at room temperature for 16 hours to form a transparent protective layer, and then ground with sandpaper to form a smooth layer. After forming the surface, it was further polished with a puff to give it a mirror finish.

With the wood decorative material thus obtained, it was possible to enjoy a new finish that was different from those of Examples 1 and 2.

(Example 4) A wood decorative material was produced in the same manner as in Example 1, except that a dye was added to the cracking paint that forms the cracked paint film.

The wood decorative material thus obtained had a finish that took advantage of the crack pattern and the natural texture, which was different from that of Example 1.

[Effects of the Invention] As explained above, the coating method of the present invention involves forming a transparent or translucent undercoat layer on the base material 1-, and then applying a cracking coating agent on top of this undercoat layer. After the film is formed, it is dried to generate crabbing in the cracked paint film, and then a transparent or translucent protective layer is formed on the cracked paint film, so the cracks that occur in the cracked paint film are Because the base material can be seen through the transparent undercoat layer at the cracks, the different color tones of the base material and the cracked coating appear in a continuous manner, allowing you to experience two types of texture at the same time. Now you can enjoy a new Crab King style pattern that has never been seen before. Furthermore, since a protective layer is formed on the cracked coating film, it is possible to reinforce the cracked pattern and provide high surface gloss. In addition, if a suitable pattern is applied to the surface of the base material by coloring or printing, this pattern will appear on the surface from the cracks in the cracked coating film through a transparent or translucent undercoat layer, so it will not be a cracked pattern. It is also possible to enjoy composite decoration with the pattern on the base material surface.

[Brief explanation of the drawing]

1 to 5 are schematic cross-sectional views showing examples of the coating method of the present invention. 1...Base material, 2...Undercoat layer, 3...Crack coating film, 4...Protective layer.

Claims (1)

[Claims] A transparent or translucent undercoat layer is formed on a base material, and a cracking coating agent is further applied on this undercoat layer to form a cracked coating film, and then dried to form the cracked coating film. A coating method characterized by generating cracks in the paint film, and then forming a transparent or semi-transparent protective layer on the cracked paint film.