JPH02222754A - Coating method - Google Patents

Abstract

PURPOSE:To simply form a decorative material having a grainy pattern by forming a colored layer on a base material and dropping a solvent on the colored layer in the form of spots. CONSTITUTION:A colored layer 2 of urethane resin, etc., is formed on a base material 1 and a solvent 4 such as acetone is dropped on the colored layer 2 in the form of spots. By this simple method, a decorative material having a grainy pattern can be formed. A protective film 5 of transparent or translucent resin is further formed on the grainy pattern as required.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a coating method applied to building materials such as furniture, wall materials, flooring materials, etc., and in particular, to a method capable of expressing a stone grain pattern. It is something.

[Prior art] Conventionally, one of the coating methods for forming a stone grain pattern is a method in which crushed pieces of stone are processed and dispersed and fixed in a colored layer, or a method in which a colored layer has siloxane bonds is used. A method is known in which a spot-like stone grain pattern is expressed by adding and dispersing a compound that is incompatible with the colored layer, such as a compound.

[Problems to be Solved by the Invention] However, the method using the above-mentioned stone fragments has the drawbacks that processing is difficult and costs are high.

Furthermore, the method of adding a compound that is incompatible with the colored layer has the disadvantage that it is not only possible to express only a uniform pattern, but also to be unable to obtain a fine stone-grain pattern.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a coating method that solves the above-mentioned problems and allows a decorative material having a stone grain pattern to be obtained by a simple method.

[Means for Solving the Problems] The present invention involves forming a colored layer on a base material, and then dropping a solvent onto the colored layer in spots to dissolve a part of the colored layer. The solution was to form a stone pattern.

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

1 to 4 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. This base material can be wood-based such as plywood, plywood wood cement board, particle board, resin-based such as fiber-reinforced synthetic resin board, or metal-based such as aluminum plate or stainless steel plate. The thickness is not particularly limited, but is usually about 0.80 to 500 CJrx.

A colored layer 2 is formed on this base material 1, but in order to improve the adhesion between the base material 1 and the colored layer 2, it is also possible to apply an undercoat 3 in advance before forming the colored layer 2. be. This undercoat 3 is usually done using a transparent paint such as polyurethane clear, polyester clear, or amino alkyd clear, opaque paint such as Surfer Wood Filler, or translucent paint such as Sanding Solar, but other materials may also be used. .

Next, a colored layer 2 is formed on the base material (1) or the undercoat 3. The colored layer 2 is made by adding an appropriate coloring agent to a resin such as urethane resin, alkyd resin, acrylic resin, unsaturated polyester resin, melamine resin, or epoxy resin as necessary. A resin composition is used. Depending on the desired color, colorants include inorganic pigments such as carbon black, titanium, cadmium, aluminum, and lead, as well as water-based colorants made by extracting ingredients such as tree bark and fruit peel into water, and Giltonite. Oil-based colorants such as , alcohol-based colorants such as sulfone dyes and azo dyes are selected and used. Here, the blending amount of the colorant in this resin composition is preferably about 1-11/(. Various additives may be added.

This resin composition is applied by a method such as brush coating, roll coater, spin coater, flow coater, electrostatic coating, etc. so that the wet coating amount is about 20 to 150 y/x2.

Next, while the colored layer 2 is not yet cured, the solvent 4 is dripped onto the colored layer 2 in spots as shown in FIG. Examples of the solvent 4 include aromatics such as benzene and toluene, ketones such as acetone and methyl ethyl ketone, esters such as ethyl acetate, ethers, and glycol ethers such as glycol monomethyl ether. Colored layer 2 is soluble or swellable,
It is selected and used as one kind or a mixed solvent of two or more kinds. Alternatively, a colored solvent obtained by adding an appropriate coloring agent to these solvents as necessary may be used.

The method of spraying may be any well-known and commonly used method, such as a method using a spray gun or a curtain flow coater. 1゜JIj! It is desirable to spray it to a certain extent. Specifically, a method using air spray may be used, and if it is desired to obtain droplets of the above-mentioned size, the air pressure during spraying may be lowered to about 0.1 MPa or less.

By spraying the solvent 4 in this way, only the parts of the colored layer 2 that came into contact with the solvent 4 swell and dissolve, forming a light-colored spot-like pattern, while the parts that did not come into contact with the solvent 4 swell and dissolve. It remains a dark color.

That is, as shown in FIG. 3, for example, a stone-like pattern is obtained in which light-colored islands are scattered in spots in a dark-colored sea. Furthermore, when a colored solvent is used as the solvent, a stone grain pattern is created in which the sea and the islands exhibit different hues.

Then, it is dried and cured. For drying, the film may be left standing in an oven heated to about 50°C, but an infrared irradiation oven or the like may also be used.

Next, as shown in FIG. 4, if necessary, a protective film 5 made of transparent or translucent resin is formed on the stone grain pattern. This protective film 5 may be made of, for example, epoxy resin, unsaturated polyester resin, acrylic resin, diallyl phthalate resin, silicone resin, phenol resin, vinyl chloride resin, polypropylene resin, acrylic silicone resin, or fluorine resin. or a mixture thereof, but other transparent or translucent resins may be used without any problem.Additionally, if necessary, an appropriate coloring agent may be added to create colored transparent or colored semi-transparent resins. It can also be used as a resin.By forming such a protective film 5, the surface is smoothed and the stone grain pattern is protected, and scratches and destruction due to impact etc. can be avoided.

Furthermore, this surface protection film 5 can be subjected to grinding or polishing treatment, or can be subjected to mirror finishing treatment.

The decorative material obtained in this way has a pattern that looks like spots of light-colored islands scattered in a dark-colored sea, and has a beautiful stone grain pattern of dark and light colors. . In addition, if a colored solvent containing a desired coloring agent is used as the above solvent, it is possible to create not just a dark and light stone-like pattern, but a richly varied color tone in which the sea and the island are each different from each other. You can enjoy the stone grain pattern.

[Example] Coating was performed according to the steps shown below to produce a decorative material.

(Example 1) (Step 1) Thickness! A 30097x” unsaturated polyester surfer was applied to a base material of 301m thick plywood with a phenolic resin-impregnated paper laminated cured sheet of 1Oxm pasted.
An undercoat layer was formed by coating and drying.

(Step 2) This surface was ground with a #2.40 sand blade.

(Step 3) On top of this, a coloring agent made by adding 1% black acid salt dye to a coating liquid containing 10% by weight of urethane resin is applied at a solid content of IOg/x" to form a colored layer. was formed.

(Step 4) While the colored layer was not yet cured, a mixed solvent of acetone/toluene = 7/3 was sprayed onto the colored layer using a spray gun. When spraying with a spray gun, by lowering the air pressure to below 0, IMPa,
A small drop of the above solvent could be dispersed. The size of the islands formed on the colored layer by spraying this solvent was 3 to 10 cm in diameter.

(Step 5) Drying and curing was performed at a temperature of 50° C. and a time of 30 minutes.

(Step 6) Further, a urethane resin clear was applied thereon to a solid content of 2097z'', and then dried at a temperature of 50°C for 90 minutes to fix the stone grain pattern.

(Step 7) Further, the top of this coating film is ground with #240 sand paper, and unsaturated polyester resin is applied thereon so that the solid content is 500 Li/j11, and left overnight at room temperature. It was cured by.

(Step 8) Furthermore, this top was ground with a #400 to #600 sandpaper, and was further given a puff finish to give a mirror finish.

The decorative material obtained by this method has a spot-like pattern that looks like light-black islands scattered in a sea of dark-black threads, making it look like granite. It had the appearance of

(Example 2) A decorative material was obtained in the same manner as in Example 1, except that in the above-mentioned (Step 3), a colorant containing no urethane resin was used.

In the decorative materials obtained in this way, the dissolution of the colored layer by the mixed solvent progressed further, resulting in a stone-like pattern or randomly arranged appearance, with a richly varied appearance. had.

[Effects of the Invention] As explained above, the coating method of the present invention involves forming a colored layer on a base material and then dropping a solvent onto the colored layer in spots. It is possible to form a spot-like pattern in which light-colored islands are dispersed, and it is possible to produce a decorative material with a stone-like appearance. In addition, if a solvent containing a desired coloring agent is used as the above solvent, it is possible to create not just a stone-like pattern of dark and light colors, but a richly varied color tone in which the sea and the island are each different from each other. You can enjoy the stone grain pattern. In addition, the size of the islands can be controlled by the conditions under which the solvent is dropped, and the color tone can be changed by changing the colored layer or the coloring agent added to the solvent.
There is also the advantage that a decorative material having an appearance suitable for the purpose can be obtained.

[Brief explanation of the drawing]

1 to 4 are schematic sectional views showing an example of the coating method of the present invention in the order of steps. ... Base material, 2 ... Colored layer, 4 ... Solvent.

Claims (1)

[Claims] A coating method characterized by forming a colored layer on a base material and then dropping a solvent onto the colored layer in spots.