KR100774557B1 - A coating method of pear lescent pigment for cellular phone - Google Patents

Abstract

A method for coating a case for a cellular phone with pearlescent pigment is provided to apply easily the pearlescent pigment on the case without damaging the case and to change interference color into silver, gold, red, purple, blue, and green according to the viewing angle due to interference of the light. A method for coating a case(10) for a cellular phone with pearlescent pigment comprises the steps of: cleaning foreign materials of the case by a thinner and a surfactant and preheating the case at low temperature of 50~60°C for 10 minutes; forming a first color film by spraying the thinner on the preheated case; forming a second color film by drying the case at middle temperature of 70~90°C and applying the pigment, the thinner, a surface conditioner, and an antisettling agent on the upper surface of the case; drying the case at the middle temperature of 70~90°C, spraying a color base layer on the upside of the case, mixing the pearlescent pigment and acryl-melamine resin and toluene and ethyl acetate as a solvent, and coating the case with the mixture; and coating the case with clear paints.

Description

A coating method of pear lescent pigment for cellular phone

1 is a diagram showing the interference color according to the thickness of the metal oxide

Figure 2 is a cross-sectional laminated view of the mobile phone case manufactured by the coating method of the present invention

3a and 3b are photographs showing a mobile phone case coated with a pearlescent pigment of the present invention

<Detailed description of the major symbols in the drawings>

10: case

20: lower coating

30: middle coating

40: base coat layer

50: pigment layer

60: coating layer

The present invention relates to a method of coating a pearlescent pigment on the case for a mobile communication terminal, and more particularly, a coating to display a specific interference color by applying a pearlescent pigment on the outside of the case of the injection-molded synthetic resin mobile communication terminal It is about a method.

Mankind has manufactured and used various kinds of natural or artificial synthetic pigments or dyes to express beauty from the primitive age, and recently, pearlescent pigments are widely used because they can express unique beauty compared to other general pigments or dyes.

Pearlescent pigments, also known as pearlescent pigments, exhibit high gloss due to the regular reflection of the pigment incident light from the pigment particles in a certain direction and are widely known as pigments having various colors due to interference of light. .

In other words, when the pigment or dye is a red color, it can be detected in any direction when observed in a red color, but the pearlescent pigment has a difference in the angle caused by the reflection of part and the other part of the light when the light passes through the pigment layer. Due to the angle observed will have a double or multiple colors. This results in various interference colors due to the difference in refractive index between the low refractive index mica and the high refractive index titanium dioxide metal oxide layer.

Early pearlescent pigments have used guanine, taken from fish scales such as herring and cutlass, but since the amount of these natural substances is limited, much research has been done on artificially synthesized pearlescent pigments. .

As an example, the most typical manufacturing method is a metal oxide having a high refractive index in the mica foil having a low refractive index in US Patent Application No. 179830, Japanese Patent Application No. 19890325435, Domestic Application No. 1998-011142, Patent 1996-001793, Various methods have been described for coating and producing pearlescent pigments.

Figure 1 shows the interference color according to the thickness of the metal oxide for the pearlescent pigment, it shows the interference color appearing according to the thickness of the titanium dioxide (TiO ₂ ) coated on the metal oxide.

These pearlescent pigments are characterized by various interference colors and pearlescent high gloss characteristics, and are generally used for automobile paints, cosmetics, wallpaper, flooring, plastic extrusion / injection, artificial leather, printing ink, and paints as consumer purchasing tendencies become more advanced. It has been used in many industrial fields such as.

 On the other hand, in recent years, due to the popularization of mobile communication terminals including mobile phones, the demand is increasing, and each sales company has established a differentiation policy not only for the functional part but also for the refined design and color in order to satisfy consumers' purchase intentions in various ways. There is a situation.

However, until now, the color applied to mobile communication terminals including mobile phones is mainly limited to monochromatic colors such as black, white, and silver, so that consumers can easily feel monotony, especially pearlescent pigments mainly used in automobile paints and cosmetics. To apply to the case of the mobile communication terminal, the coating method is different depending on the material of the adherend has not been made yet.

In other words, the conventional coating material containing a pearlescent pigment is a metal material, the deformation of the heat is small, so that it can be easily colored, but the case of the mobile communication terminal manufactured by injecting a synthetic resin has a large deformation of heat, There was a problem that coloring is not easy with the coating method.

Therefore, the present invention is configured to solve the above problems, by using a pearlescent pigment in the case of the synthetic resin material forming the outside of the mobile communication terminal, including a mobile phone, while maintaining the unique texture and color of the person while using the mobile phone An object of the present invention is to provide a method of coating a pearlescent pigment on a case for a mobile communication terminal having various interference colors such as silver, gold, red, blue, and green depending on the viewing angle.

The present invention to achieve the above object,

Washing the foreign matter in the case with a thinner and a surfactant as a solvent, and preheating the low temperature at 50 to 60 ° C. for 10 minutes;

A paint coating step of spraying thinner as a solvent on the preheated case to form a primary color film;

A medium coating treatment step of forming a secondary color film by putting the case-treated case at 70-90 ° C. in a medium temperature dry state, and then putting a pigment, a thinner, a surface conditioner and an anti-settling agent on the upper surface thereof;

After the medium-coated case was also dried at 70-90 ° C. in medium temperature, the color base layer was sprayed on the upper surface, and then coated with a mixture of toluene and ethyl acetate as a pearlescent pigment, an acrylic-melamine resin, and a solvent. Processing;

It is achieved by providing a method for coating a pearlescent pigment in the case for a mobile communication terminal, characterized in that the coating step;

Hereinafter, the present invention will be described in more detail.

The present invention is to paint the pearlescent pigment obtained by coating a metal oxide having a high refractive index on the mica flakes having a low refractive index to apply to the outside of the case of the injection molded mobile communication terminal. The case corresponds to a folder cover, an LCD screen, a keypad, and a battery unit of the mobile communication terminal.

2 is a cross-sectional cross-sectional view of a mobile phone case manufactured by the coating method of the present invention, with reference to this will be described the coating method of the present invention.

To this end, the present invention, first, to remove the foreign matter by washing the outer surface of the case 10 injection molded with a thinner and surfactant as a solvent, and heat-treated at 50 ~ 60 ℃ for 10 minutes to paint the case 10 well Low temperature pre-treatment for coating.

As described above, the prepainted case 10 is sprayed with a thinner as a solvent to process the undercoat 20 to form a primary color film. In the case of using a black coat of a dark color base coat, the final top coat is a base. Since the color is given in the coat, the primary color film may be a solvent alone, but when adding a silver-based or white-based base coat color, it is preferable to apply a silver-based rust preventive primer together. At this time, it is preferable to form the undercoat 20 by spraying with a high pressure gun at a pressure of 1.0 kg / cm ² to form a thickness of 5 to 6 μm.

After drying the case treated with the undercoat 20 as described above at 70 to 90 ° C., a pigment and a solvent having a predetermined color (thinner), a surface adjuster, and a sedimentation inhibitor are put on the upper surface thereof, and the thickness of 5 to 6 μm is also applied. The intermediate coating 30 is formed to form a secondary color film.

Exciting blending ratio used as the pigment and the solvent, since the blending ratio is different depending on the pigment to be used, it is not particularly limited, but is preferably mixed in a weight ratio of 2: 8 ~ 5: 5.

The surface control agent is used to prevent defects due to desorption of the product, to improve the corrosion resistance after the coating as well as to fine and dense the coating, the anti-settling agent is to prevent the sinking of the pigment particles to a large size or agglomeration and to stir It is mainly used to prevent a cake on the lower part of the container, aluminum stearate, wax and the like are used. Such surface modifier and anti-settling agent exhibits the effect even if only 3 to 5% by weight of the mixture for the intermediate coating 30, respectively.

After the intermediate coating 30, the case 10 is treated at 70 ~ 90 ℃ medium-temperature drying as described above, the pressure of 1.0kg / cm ² to have a thickness of 80 ~ 100㎛ the color base layer 40 on the upper surface After spraying with a high-pressure gun of, the mixture of pearlescent pigment, acrylic-melamine resin and toluene or ethyl acetate as a solvent in a ratio of 1: 3: 1 was applied to the pigment layer, which is also 80 to 100 μm. Top coat coating to form (50) is to be carried out.

The color base layer 40 is a mixture of a paint having a predetermined color, a curing agent, and ion water at a 3: 1: 1.5 magnification. In addition, an acrylic resin (ACRYLIC RESIN) is added as an additive by an equal amount of ion water. Viscosity can be maintained.

In the case of the color base layer 40, the color is determined according to the type of the interference color so that the interference effect can be maximized according to the interference color of the pearlescent pigment. For example, a pearlescent pigment having a blue interference color can be used. In this case, the color of the color base layer 40 should be selected in the same blue series. The same applies to gold, red, and green. That is, when the same color is used as the base color, not only the reflected color is clearly seen depending on the viewing angle, but also a refined color can be represented in terms of design.

As described above, acrylic resin (ACRYLIC RESIN), butanol (BUTANOL), and toluene are coated on the top surface of the top-coated case 10 to form the color base layer 40 and the pearlescent pigment layer 50 as described above. By forming a coating layer 60 having a complete all the painting work.

Through this coating method, it is made of synthetic resin injection molded products, and it is not only easy to color pearlescent pigment in the case of mobile communication terminal which is relatively weak to heat, but also silver due to the interference of light depending on the angle of view. It has a distinctive color through the interference colors of gold, red, purple, blue and green and the unique color of pearly.

Therefore, the mobile communication terminal manufactured in this way can provide a unique texture and luster of pearlescent pigments and satisfy consumer's purchasing tendency gradually advanced by implementing various interference colors. Such a mobile communication terminal turns out to be applicable not only to a mobile phone held as a main example of the present invention but also to an external case such as a PDA, a computer, an electronic dictionary, a terminal, and the like.

Hereinafter, the present invention will be described in more detail with reference to the following examples. The following examples are merely illustrative of the present invention, and the present invention is not limited by the following examples.

<Manufacture example 1>

Production of Pearlescent Pigments

10 w / v% or less of mica slurry was added to the reactor, adjusted to pH 2 or less with sulfuric acid, and maintained at a temperature of 70 ° C. or higher and TiOSO ₄ salts were respectively 5, 10, 15, 20, 25, 30 w / v%. At the same time, urea was also injected into the reactor at the same time as TiOSO ₄ salt.

According to the concentration of the TiOSO ₄ salt, the coating amount and the coating thickness of the titanium dioxide metal oxide were also increased to obtain a pearl component having an interference color in the order of silver, gold, red, purple, blue, and green, and the obtained pearl component was 60 After stirring for about a minute, washed with 1N ammonia water, and then sufficiently dried at 100 ℃ and calcined at 900 ℃ for 30 minutes to obtain a pearlescent pigment.

<Example 1>

-Painting of the pearlescent pigment

Clean the painted surface with thinner and surfactant in the injection molded mobile phone case, preheat it at 60 ℃ for 10 minutes, and then apply the thinner with a high pressure gun of 1.0kg / cm ² on the painted surface. The coating was carried out by spraying to form a primary color film of 6 mu m.

After coating as above, after drying at 90 ℃ for medium temperature, put a pigment and solvent, surface conditioner, and anti-settling agent on the surface of the coating, and then apply a middle coating to form a secondary color film of 6㎛, and paint and curing agent on the upper surface. And a mixture of 3: 1: 1.5 and ion water were applied to form a 100 μm color base layer, and then the pearlescent pigment obtained as in Production Example 1, an acryl-melamine resin, and toluene as a solvent were each 1: 3: The coating mixture was mixed with 1 to coat a coating layer to form a pigment layer of 100 μm, and a clear paint was coated to complete the painting work.

As shown in FIGS. 3A and 3B attached to the pearlescent pigment, the mobile phone case coated with the pearlescent pigment has various interference colors such as silver, gold, red, blue, and green due to the interference of light. There was no physical deformation of the case after painting, with the naked eye or touch.

As described above, the method of coating the pearlescent pigment on the case for the mobile communication terminal of the present invention is made of a synthetic resin injection molded product, and the pearlescent pigment can be easily colored on the case for the mobile communication terminal that is relatively weak to heat without damage to the product. However, due to the interference of light depending on the angle of view of the person, the distinctive texture of silver, gold, red, purple, blue, green, and pearlescent color provides unique texture and gloss and gradually improves the implementation of various interference colors. The effect is to satisfy the purchasing tendency of consumers.

Claims (7)

Washing the foreign matter in the case with a thinner and a surfactant as a solvent, and preheating the low temperature at 50 to 60 ° C. for 10 minutes; A paint coating step of spraying thinner as a solvent on the preheated case to form a primary color film; A medium coating treatment step of forming a secondary color film by putting the case-treated case at 70-90 ° C. in a medium temperature dry state, and then putting a pigment, a thinner, a surface conditioner and an anti-settling agent on the upper surface thereof; After the medium-coated case was also dried at 70-90 ° C. in medium temperature, the color base layer was sprayed on the upper surface, and then coated with a mixture of toluene and ethyl acetate as a pearlescent pigment, an acrylic-melamine resin, and a solvent. Processing; Coating a case with a clear coating on the top coat-treated case; a pearlescent pigment on a case for a mobile communication terminal. The method according to claim 1, wherein the primary color film of the paint coat and the secondary color film of the middle coat is sprayed with a high pressure gun at a pressure of 1.0kg / cm ² to form a thickness of 5 ~ 6㎛. Method of coating a pearlescent pigment in the case for a mobile communication terminal. The method according to claim 1 or 2, wherein the surface adjustment agent and anti-settling agent used in the middle coating is added to the pearlescent pigment in the case for the mobile communication terminal, characterized in that 3 to 5% by weight is added to the mixture constituting the middle coating, respectively. How to paint. The case of claim 3, wherein the color base layer is sprayed with a high-pressure gun at a pressure of 1.0 kg / cm ² and has a pearl color in the case for the mobile communication terminal, characterized in that the thickness is formed to be 80 to 100 μm thick. How to paint a pigment. The case of claim 4, wherein the pigment layer is formed by a mixture of pearlescent pigment, acryl-melamine resin, and toluene or ethyl acetate in a ratio of 1: 3: 1, respectively, as a solvent. How to paint pearlescent pigments. 6. The method of claim 5, wherein the color of the color base layer is the same color as that of the interference color of the pearlescent pigment used in the pigment layer. Case for a mobile communication terminal, characterized in that the pearlescent color by the coating method of claim 1.

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