KR20080075622A - A coloring method for metal substrates and thereof product - Google Patents

Abstract

A metal substrate coloring method and products manufactured by the same are provided to produce a see-through color metal substrate of uniform color without stains by firstly forming a transparent coating film on a metal sheet and then coloring the upside of the transparent coating film with dyes. A metal substrate coloring method comprises a step for forming a coating film by applying transparent paints on a metal substrate of which the surface is processed, and drying the applied transparent paints and a step for permeating dye particles into the coating film by dipping the metal substrate in a dye solution. The metal substrate has the surface processed in the form selected from a group comprising surface number NO.3, NO.4, NO.6, and NO.8 and HL(Hair Line) according to a buff polishing method on the basis of stainless steel.

Description

A coloring method for metal substrates and pretty product}

1 is a side view showing a non-uniform thickness of a coating film formed on a conventional metal substrate

2 is a side view showing a general flatness of the metal substrate

3 is a process chart showing a roll coating method of a conventional metal coating method

Figure 4 is a process chart showing a coating method by spraying the conventional metal coating method

5 is a process chart showing the electrostatic coating method of the conventional metal coating method

Figure 6 is a side view showing that the dye particles penetrate and dye on the coating film of the transparent metal substrate in accordance with the present invention

Figure 7 is a process diagram showing a simple method of coloring a preferred metal plate according to the present invention for each series of processes

8 is a front view showing a polished state of the metal surface;

9 is a graph showing the depth of coating film penetration of dye particles with concentration according to time according to the present invention

<Description of the symbols for the main parts of the drawings>

1: coating film 2: metal base

3: ground 4: paint

5: dye particle 6: dye solution

7: transparent painted steel sheet

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for coloring a metal substrate and a product thereof, and more particularly, in the coloring of a metal substrate surface, by first forming a coating film on the metal substrate surface using a transparent paint and coloring a dye thereon, A metal substrate coloring method for producing a colored metal plate with uniform color while utilizing the intrinsic texture of the present invention and a product thereof.

In general, metals are often used by coating to provide corrosion resistance, to protect surfaces, and to maintain the desired lifespan and to provide the required appearance or function having a specific purpose.

By the way, the coating (coating) is mainly classified into a transparent colorless clear coating or shielding (opaque) coating.

Since clear coating is performed using a transparent paint, the state or color of the metal surface is expressed as it is, and shielding coating can express various colors by adding pigments such as pigments of various desired colors to the transparent paint.

However, the clear coating may be limited in the use environment because the monotonous and cold texture of the metal is intact, and the shielding coating may not obtain a luxurious texture because it must depend on the color of the coating formed on the metal surface.

In addition, if you want to express the color while making use of the texture of the metal surface, by adjusting the amount of pigment in the transparent paint, it is possible to see the metal surface. Differences in production due to thickness differences, that is, stains are likely to occur. This is because in FIG. 1, the portion a is actually thinner than the portion b, so that the color appears thinner than the portion b.

Also, as shown in FIG. 2, the shape of the metal plate is not completely flat, and the coating method also has variations in each point even in the same plate as shown in FIGS. 3, 4, and 5. In the case of forming a see-through coating film by adding a little pigment to the colorless paint, there is a problem in that a stain may occur due to the difference in thickness of the coating film, thereby degrading the value of the product.

As described above, conventionally, since the thickness of the painted surface is uneven, the method of properly adding the pigment to the colorless paint inevitably causes stains on the metal surface see-through colored metal plate that can improve the texture of the metal surface. Due to the difficulty in producing a metal base, a colorless transparent clear coating or a shielding coating in which the metal surface is completely invisible has to be applied.

In order to solve the above-mentioned problems, the present inventors have developed a see-through coloring method for a metal substrate, which does not generate spots even when the thickness of the coating film is uneven. In addition, in the present invention, it is possible to obtain the saturation of the desired color by determining the concentration, temperature, and immersion time of the dye.

Therefore, an object of the present invention is to form a coating film by applying a transparent coating on the surface of the metal substrate processed surface, and uniformly dyeing the dye on the coating film, the method of coloring the metal substrate on which the metal surface is transparent and colored by the method To provide a metal substrate.

In order to achieve the above object, the present invention (a) a coating step of forming a coating film by applying a transparent paint on the surface of the metal substrate processed; And (b) a dyeing step of immersing the metal substrate having passed through the step (a) in a dye solution to infiltrate the dye particles into the coating film. It provides a method of coloring a metal substrate comprising a.

Moreover, in order to achieve another objective, this invention provides the metal base colored by the said method.

Hereinafter, the present invention will be described in detail.

At this time, if there is no other definitions in the technical terms and scientific terms used herein, those having ordinary skill in the art to which this invention belongs have the meaning that is commonly understood.

In addition, repeated description of the same technical configuration and operation as in the prior art will be omitted.

The metal base used in the present invention refers to a metal plate which can be painted, and means a steel plate, an aluminum plate, a copper plate, or the like, and preferably a steel plate is used.

In addition, in the present invention, the coated metal plate or the coated steel plate means single-sided or double-sided coating.

In the present invention, a buff refers to a cloth or leather mechanism that is embedded by processing abrasive material when polishing a metal surface. The buffing method includes processing a surface of a metal substrate by polishing the metal surface using the buff. buffing).

At this time, the surface state processed the surface of the metal substrate in the present invention, as shown in Table 1 below, based on the surface polishing form according to the classification method of the surface polishing form based on the stainless steel sheet.

And in this invention, in the coating metal plate, since the perspective of a metal surface is a main objective, the beautiful process of a metal surface is requested | required first. That is, since the machining state of the metal surface is directly related to the quality of the product, the surface of the desired machining state must be secured.

Accordingly, in the present invention, a metal substrate having a surface polished in a form selected from the group consisting of surface symbols NO.3, NO.4, NO.6, NO.8, and HL (hair line) among the surface polishing forms for the reasons described above. Preference is given to using.

Moreover, in this invention, it is preferable to make surface roughness Ra of the metal base material which processed the surface by the above-mentioned buffer grinding | polishing method become 0.05 mm or less. This is because when the surface roughness exceeds 0.05, the above-described metal surface is not beautiful and the commerciality of the transparently colored metal plate is inferior.

In addition, in the case of hairline polishing, due to the characteristics of the polishing form, it is not greatly affected by the surface roughness, but it is preferable to form a continuous or discontinuous constant pattern for the commercial property.

In addition, in order to successfully produce a metallic surface see-through color, first, productivity, second, color reproducibility, and third, color uniformity must be ensured.

Thus, the present invention will be described in detail for each process the method of coloring the surface of the metal substrate processed.

First step: painting process

In this step, a transparent paint is applied to the surface of the metal substrate on which the surface is processed and dried to form a transparent coating film having a predetermined thickness. This is because the transparent paint forms a transparent coating on the metal surface of which the surface is processed, thereby providing the effect of coloring by the penetration of the dye.

At this time, the thickness of the transparent coating film primarily coated on the surface of the metal surface is 5㎛ or more not affected by the penetration of the dye in order to maintain the coating function by the adhesion of the transparent coating film and the penetration of the dye. It is preferable to form. However, since the thickness of the transparent coating film of this invention may be less than 5 micrometers according to the characteristic of a transparent paint or the characteristic of a dye, the thickness of the transparent coating film of this invention is not limited to the numerical value mentioned above.

And it is preferable that the metal plate to which the transparent coating material was apply | coated is dried at the temperature of 120-220 degreeC normally according to the state of dye solution, and forms a transparent coating film.

It is preferable to use the transparent coating material chosen from the group which consists of a urethane resin, an acrylic resin, and a fluororesin for the transparent coating used by this invention. However, in the present invention, in addition to the above-mentioned transparent paint, any of the above-described transparent paints may be used as long as the dye is deposited to form a coating film to be colored.

2nd process: Dyeing ( 染着 ) fair

In this step, the metal substrate having undergone the first step is immersed in a dye solution in which the dye is dissolved, so that the dye molecules penetrate into the transparent coating film and are colored.

In the present invention, the dyeing process may be used by adopting a batch (batch) and continuous to ensure a smooth productivity (see Fig. 7c).

In addition, the dyeing process of the present invention preferably has a immersion time within 10 minutes in the color bath for smooth productivity, and in order to do this, the higher the dye concentration is, the more preferable. However, it is important not to exceed 10%, which is a color sensitive density, because a too high dye concentration may cause color deviation between production lots and cause color reproducibility. That is, in the 10% solution, it is preferable to avoid the section because the coloring is sensitive to changes in time and temperature.

And, as shown in Figure 6, the dye particles are dispersed in a fine gap of the transparent coating film in the color bath, and the coloring is performed, in this case, the dye solution should be maintained at a constant temperature for easy coloring. This is because evaporation of the solution over time causes an increase in concentration and continuous operation plays a role in decreasing the concentration. In addition, since the change in the dye concentration causes color difference in working time and temperature, it is necessary to control during the production, in fact, the time of replenishing or dipping the dye or the solvent.

Thus, it is necessary to manage the proper dye concentration and temperature according to the appropriate amount of work so that the dye concentration can be in equilibrium.

Therefore, in order to facilitate smooth productivity and continuity of the work as described above, in the present invention, the concentration of the dye solution is preferably 0.1 to 10% (w / v) to immerse the metal substrate on which the transparent coating film is formed at a temperature range of 50 to 80 ° C. Do.

Specifically, by measuring and calculating the exact performance value in consideration of the capacity of the coloring tank and the area of the input material, it is possible to maintain the equilibrium state of the dye.

In addition, in the present invention, in order to lower the color difference in the same metal plate to improve color uniformity, it is preferable to perform bubbling together with the dye solution during the coloring process. In this case, the color difference in the same metal plate means a staining phenomenon and corresponds to a factor that greatly affects product quality.

In the present invention, it is preferable to provide a coloring tank with a screw or a pump to stir the dye solution to generate bubbling.

The dye used in the present invention may be water-soluble dyes and fat-soluble dyes that can be dissolved according to the type of the solution, and specifically, azo dyes, anthraquinone dyes, indigoide dyes, carbonium dyes, Sulfide dyes, quinoneimine dyes, phthalocyanine dyes, acridine dyes, thiazole dyes and the like. However, the dye used in the present invention is not limited to the dyes described above, and any dye may be used as long as it is a dye meeting the object of the present invention.

As described above, the metal plate coloring process according to the present invention is summarized and shown in FIG. 7.

7 is a process diagram briefly showing a preferred method of coloring a metal plate according to the present invention for each series of processes, showing a metal surface polishing process (a), a painting process (b) and a dyeing process (c).

Specifically, Figure 7 (a) shows a buffing process, a-1 is a metal substrate for the surface processing, a-2 represents a grinding wheel (Wheel), the wheel is typically used non-woven fabric or cotton wool, etc. In order to improve the polishing force, it is briefly shown to use an abrasive sprayed or abrasive wheel such as a-3.

In addition, the polishing method may be a method of polishing while rotating the polishing wheel at a high speed while passing the metal material thereunder, wherein the metal peels off the surface due to the reflection of the polishing wheel and the abrasive to give a unique gloss of the metal. do. In the present invention, the buffing process is mainly advantageous for glossing the metal surface.

Figure 7 (b) shows a hairline process, similar to the buffing process described above, but instead of a smooth grinding wheel, a rough surface sand paper (Sand paper) and the like, which is rough because the sand paper is rough and polished to the metal surface Rather, it leaves a mechanical polishing mark.

Figure 7 (c) is shown in the dyeing process, a simplified view of the batch process (batch) and continuous process diagram. At this time, the surface is polished with a transparent paint on the metal substrate, the coating method can be mainly used the conventional coating method shown in Figs.

Hereinafter, the present invention will be described in more detail with reference to specific examples. However, the present invention is not limited to the following examples, and it will be apparent to those skilled in the art that various changes or modifications can be made within the spirit and scope of the present invention.

[ Example ]

1. Surface treatment of metal plate

The method of buffing one side of a stainless steel sheet of 1,219mm x 2,438mm size according to the regulations. The surface was processed with 4.

And NO. 4 The surface of the steel sheet was processed by a HL (Hair line) according to the conventional polishing method.

Fig. 8 is a front view showing the polished state of the metal surface, showing the polished state of HL (a) and NO.4.

2. Metal plate coating

In Example 1, a transparent urethane resin was applied to one surface of the metal plate surface-treated and dried to form a coating film having a thickness of 5 μm.

3. Metal plate coloring

A dye solution of 1,500 mm in width and 3,000 mm in length was filled with a 0.8% (w / v) dye solution (Scarlet 3B) at a height of 500 mm, and a sheet of 1,219 mm X 2,438 mm per 5 minutes was immersed at a temperature of 70 ° C. Coloring work was performed.

As a result, it was confirmed that the dye concentration was maintained in an equilibrium state under the above-described coloring conditions.

In addition, the dye length was immersed in the dye solution of 1%, 3% and 5% by the same method as described above and permeated into the transparent coating film at time of 90 ° C.

As a result, as shown in Figure 10, it was confirmed that the dye penetration depth is proportionally increased in proportion to the dye concentration and the immersion time, of which 5㎛ thickness within 10 minutes of coloring in the dye solution of 5% concentration It was found that the dye could penetrate uniformly into the transparent coating film of.

In addition, modifications, variations, and substitutions of a range of the above-described disclosure are possible, and in some cases, only some of the features of the present invention may be used. Accordingly, the appended claims should be construed broadly in accordance with the spirit and scope of the invention.

As described above, in the conventional metal coloring method, the metal surface is colored by using a pigment-based colored paint, but it is impossible to form a uniform coating film having uneven flatness of the metal surface and practically no variation in the thickness of the coating film. The see-through color had no choice but to stain.

However, the present invention, by forming a transparent coating film on the metal surface of the metal plate, which had to be coated with a conventional shielding color, and colored it with a dye thereon, it is possible to produce a transparent color metallic substrate having a uniform color without staining. will be.

In addition, since the metal surface becomes a perspective, it is possible to provide an advantage that the metal can be surface-treated in various ways to enhance the beauty.

Claims (6)

(a) a coating step of forming a coating film by applying a transparent paint on the processed metal substrate and drying the coating; And (b) a dyeing step of infiltrating the dye particles into the coating film by immersing the metal substrate having passed through the step (a) in a dye solution;  Metal-based coloring method comprising a. The method of claim 1, The metal substrate whose surface is processed in (a) is a form selected from the group consisting of surface symbols NO.3, NO.4, NO.6, NO.8, and HL (hair line) on the basis of a buffing polishing method. A metal substrate coloring method, characterized in that the surface of the metal substrate polished. The method of claim 2, The surface-treated metal substrate is a metal substrate coloring method characterized in that the surface roughness (Ra) is processed to 0.05mm or less. The method of claim 1, The transparent coating of step (a) is a metal-based coloring method, characterized in that the paint selected from the group consisting of urethane resin, acrylic resin and fluorine resin. The method of claim 1, The dye solution of step (b) is a metal-based coloring method, characterized in that the concentration of 0.1 to 10% (w / v). Metal base material colored by the method of any one of Claims 1-6.

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