KR101236931B1 - Manufacturing Method for Protecting Case of Mobile Phone Having Marble Pattern, and the Case therefrom - Google Patents

Abstract

Provided are a method of manufacturing a mobile phone protective casing having a marble pattern and a mobile phone protective casing.
The present invention, the process for producing a primary liquid paint; Preparing a secondary liquid paint; Forming a primer layer by coating the primary liquid paint on the outer surface of the cell phone protective casing, and then drying the first liquid; And coating the secondary liquid paint on the surface of the primary dried primer layer to form a base coating layer, and then depositing acetone on the surface of the base coating layer with air pressure of 0.01 to 0.5 kg / cm 2 to form an irregular marble pattern. After, the second step of drying; relates to a method for producing a mobile phone protective casing having a marble pattern, including, and a mobile phone protective casing manufactured by this method.

Description

Manufacturing Method for Protecting Case of Mobile Phone Having Marble Pattern, and the Case therefrom}

The present invention provides a method for producing a mobile phone protective casing having a marble pattern made by using a chemical property between acetone and a material for forming a base coating layer on the surface of the mobile phone protective casing injection molded plastic or metal material of the mobile phone manufactured according to the method It is about a protection case.

At present, the mobile phone penetration rate reaches 100%, going beyond the one-person-one-phone era to the one-person-two-phone era. Considering the actual mobile phone age range from 7 years old to 79 years old, the number of single-line subscribers using two or more mobile phones is quite large.

These mobile phones have a variety of functions including cameras, TVs, computers, banking, credit, credit cards, etc., and the cost of the devices is also increasing, and the design is diverse. In addition to these functional aspects, mobile phones have a role as a means of expressing a personality, and thus, the market for mobile phone accessories is growing. Due to these effects, more and more users are using cell phone protection casings with various materials, colors, and shapes.

In the early days, cell phone protection cases were mainly made of transparent plastic or painted plastic, but as consumer preferences diversified, non-ferrous metals such as tempered glass, stainless steel, aluminum, magnesium, and tin were adopted, and recently, natural materials such as wood, rubber, leather, etc. It is appearing. In addition, although the material and shape of the material itself is excellent, it is not directly applied due to inadequate application or high cost to the mobile phone protection casing, a method of expressing a similar material and shape by using a surface treatment technology has also appeared.

As an example, Korean Patent Laid-Open Publication No. 2008-79018 relates to a mobile phone protective casing and its surface treatment method, which has a surface treatment such that a three-dimensional pattern identical to a leather pattern is formed on the mobile phone protective casing. Directed.

On the other hand, marble exhibits a luxurious and colorful texture, but it is weak in durability and weak in impact, and has a problem of discoloration or chemical reaction due to its weak chemical resistance, and thus it has not been applied as a material of a mobile phone protection case.

The present invention was created in view of the above-described problems in the prior art, and the mobile phone protection casing having a marble pattern that can express a luxurious and colorful texture by expressing the pattern of marble without using the actual marble. It is an object of the present invention to provide a method and a cell phone protective casing manufactured therefrom.

According to an aspect of the present invention,

20-25% by weight methyl ethyl ketone, 1-5% by weight ethyl acrylate, 5-10% by weight normal butanol, 20-25% by weight methyl isobutyl ketone, 25-30% by weight toluene and residual rubber rubber resin After preparing a chloride-based primer, the primer: thinner (Thinner) by mixing in an amount of 1: 1.2 ~ 1: 1.4 to prepare a primary liquid paint;

12-16 parts by weight of methyl ethyl ketone, 5-8 parts by weight of ethyl acrylate, and methyl iso as 100 parts by weight of the solvent and thermoplastic acrylic resin in an acrylic lacker composed of a solvent, a thermoplastic acrylic resin and a pigment. 15-25 parts by weight of butyl ketone, 20-30 parts by weight of toluene, 5-8 parts by weight of dipropylene glycol monomethyl ether acetate (DPMA) and 1-4 parts by weight of xylene, 20-42 parts by weight of the thermoplastic acrylic resin, and Preparing an acrylic lacquer comprising 1-5 parts by weight of a pigment, and then mixing the acrylic lacquer: thinner in an amount of 1: 1.2 to 1: 1.4 to prepare a secondary liquid paint;

Forming a primer layer by coating the primary liquid paint on the outer surface of the cell phone protective casing, and then drying the first liquid; And

After coating the secondary liquid paint on the surface of the primary dried primer layer to form a base coating layer, and then drop the acetone on the surface of the base coating layer with pneumatic pressure of 0.01 ~ 0.5kg / ㎠ to form an irregular marble pattern It relates to a method of manufacturing a mobile phone protective casing having a marble pattern, including;

It is preferable to make the addition amount of the said chlorinated rubber-type resin into 20-30 weight%.

In addition, the thermoplastic acrylic resin is preferably used in an amount of 15-25 parts by weight.

In addition, the thermoplastic acrylic resin is preferably made of acrylic resin: beclide carbonyl vinyl vinyl resin (VMCH) is 6: 4.

In the present invention, it is preferable that the thermoplastic acrylic resin belongs to a weight average molecular weight of 90,000-100,000 g / mol.

In addition, the primer layer and the base coating layer is preferably managed in the thickness range of 5 ~ 8㎛ and 3 ~ 6㎛, respectively.

In addition, the present invention preferably further comprises a step of tertiary drying through UV irradiation after coating the UV curable resin on the surface of the secondary dried casing.

In addition, it is preferable to limit the thickness of the UV coating layer formed to 20 ~ 32㎛ range.

In addition, the present invention is manufactured by the above manufacturing process,

Cell phone protective casing injection moldings; A primer layer formed on the injection molded product; And a base coating layer formed on the primer layer and having a marble pattern. The present invention relates to a mobile phone protective casing having a marble pattern.

It is preferable to further include a UV coating layer formed on the base coating layer.

According to the method for manufacturing a mobile phone protection casing of the present invention and the mobile phone protection casing manufactured according to the above-described configuration, the irregular marble pattern is formed by the interaction between the polar thermoplastic acrylic resin and the polar acetone in the step of forming the base coating layer. By forming and acetone is not volatilized and remaining, it is possible to manufacture a mobile phone protective casing having a beautiful appearance and a marble pattern of a luxurious image.

Figure 1 (ad) is a cross-sectional view of a mobile phone protective casing showing a process of forming a marble pattern on the base coating layer in one embodiment of the present invention.
2 is a cross-sectional view of a mobile phone protective casing having a marble pattern according to an embodiment of the present invention.
3 is a photograph of the surface of the cell phone protective casing after the base coating layer of Example 1.
4 is an enlarged photograph of FIG. 3.
5 is a photograph of the surface of the cell phone protective casing after forming the UV coating layer of Example 1.
6 is a surface photograph of a mobile phone protective casing after the base coating layer of Example 2 is formed.
Figure 7 is a photograph of the surface of the cell phone protective casing after the UV coating layer formation of Example 2.

Hereinafter, the present invention will be described in detail.

The present invention is a process for preparing a primary liquid paint used to form a primer layer for protecting the P / C layer of the mobile phone protection casing and improving the adhesion of subsequent coating; Preparing a secondary liquid paint used to form a base coating layer that influences the color and material of the mobile phone protection casing; Forming a primer layer using a primary liquid paint and then drying; And forming a base coating layer using a secondary liquid paint, and forming an irregular marble pattern on the base coating layer and drying the same.

First, in the present invention, a primary liquid paint is prepared.

In the present invention, the primary liquid paint may be prepared by mixing a chloride-based primer and thinner (Thinner). The chlorine-based primer may be prepared according to a conventional method using methyl ethyl ketone, ethyl acrylate, normal butanol, methyl isobutyl ketone and toluene with respect to the rubber chlorinated resin, the solvent to dissolve the resin As a chemical, it is evaporated away after painting.

Specifically, in the present invention, 20-25% by weight of methyl ethyl ketone, 1-5% by weight of ethyl acrylate, 5-10% by weight of normal butanol, 20-25% by weight of methyl isobutyl ketone, 25-30% by weight of toluene and residual amount After preparing a chlorinated primer containing a chlorinated rubber-based resin, the primer: thinner may be mixed in an amount of 1: 1.2 to 1: 1.4 to prepare a primary liquid paint.

At this time, the amount of the rubber chlorinated resin is preferably 20-30% by weight.

Next, in the present invention, two liquid paints are prepared.

In the present invention, the two liquid paint may be prepared by mixing acrylic lacquer and thinner. The acrylic lacquer (also referred to as 'thermoplastic acrylic resin coating material') is composed of a solvent, a thermoplastic acrylic resin and a pigment, and methyl ethyl ketone, ethyl acrylate, methyl isobutyl ketone, toluene and dipropylene glycol monomethyl It can be prepared by using ether acetate (DPMA) and xylene (Xylene) as a solvent, and adding a pigment forming a color in a predetermined amount. The solvent is a chemical substance that dissolves the resin, and is evaporated away after coating.

Specifically, in the present invention, 12-16 parts by weight of methyl ethyl ketone and 5-8 parts of ethyl acrylate as the solvent, based on 100 parts by weight of the solvent and the thermoplastic acrylic resin in the acrylic lacquer (Acryl lacker) consisting of a solvent, a thermoplastic acrylic resin and a pigment. Parts by weight, 15-25 parts by weight of methyl isobutyl ketone, 20-30 parts by weight of toluene, 5-8 parts by weight of dipropylene glycol monomethyl ether acetate (DPMA) and 1-4 parts by weight of xylene, and the thermoplastic acrylic resin 20 After preparing an acrylic lacquer comprising -42 parts by weight and 1-5 parts by weight of a pigment, the secondary liquid paint may be prepared by mixing the acrylic lacquer: thinner in an amount of 1: 1.2 to 1: 1.4.

Preferably the thermoplastic acrylic resin is used in an amount of 15-25 parts by weight.

In addition, the thermoplastic acrylic resin is a mixture of acrylic resin: beclide carbonyl vinyl vinyl resin (VMCH) 6: 4.

In addition, the acrylic resin preferably belongs to a weight average molecular weight of 90,000-100,000 g / mol.

In addition, as the pigment used, all pigments that can be used for the color representation of the mobile phone protection casing, such as color organic pigments, carbon black, and mixed pigments of color organic pigments and carbon black, can be used. This allows the marble to be expressed in various colors during the process.

Next, in the present invention, after coating the primary liquid paint on the outer surface of the mobile phone protective casing to form a primer layer, it is first dried.

The primer layer is a coating layer required to protect the P / C layer of the mobile phone protective casing and improve the adhesion of subsequent coating, and may be formed by coating the primary coating solution on the outer surface of the mobile phone protective casing.

In the present invention, but not limited to the coating method, it is possible to easily form a primer layer by spraying the primary liquid paint on the outer surface of the mobile phone protective casing at an air pressure of 2 ~ 4kg / ㎠.

At this time, the thickness of the primer layer formed is preferably managed in the range of 5 ~ 8㎛.

On the other hand, in the present invention, the surface of the mobile phone protective casing is coated with the primer is desired to undergo a pretreatment process such as washing. Specifically, the highly volatile Excelsol 670 (SK Co., Korea) is used to remove contaminants on the surface of the injection molded synthetic resin or magnesium cell phone protective casing, Remove dirt with a massage.

Subsequently, the formed primer layer is primarily dried, but the present invention is not limited to the drying method, but may be cured by drying at 70 to 80 ° C. for 6 to 10 minutes using an infrared lamp in a drying booth.

And in the present invention by coating the secondary liquid paint on the surface of the primary dried primer layer to form a base coating layer. This process is a main process that influences the color and the material of the surface of the mobile phone case to be manufactured, it can be formed by coating the secondary paint solution on the surface of the primary dried primer layer.

In the present invention, the coating method is not limited, but the base coating layer may be easily formed by spraying the secondary liquid paint on the surface of the primer layer at an air pressure of 2 to 4 kg / cm 2.

At this time, the thickness of the base coating layer formed is preferably managed in the range of 3 ~ 6㎛.

Subsequently, acetone is deposited on the surface of the base coating layer at an air pressure of 0.01 to 0.5 kg / cm 2 to form an irregular marble pattern.

This process is an essential process for forming a marble pattern on the mobile phone protection casing, before the formed base coating layer dries acetone in the form of raindrops sprayed on the surface with air pressure of 0.01 ~ 0.5kg / ㎠. By dissolving the secondary liquid paint constituting the base coating layer through such dropping, acetone can penetrate into the coating paint to form irregular patterns.

The pattern is similar to that of marble, and the pattern can be variously modified by adjusting the pressure during acetone dropping and the amount of acetone droping to a desired intensity and time.

Figure 1 (a-d) is a view showing a process of forming a marble pattern of irregular patterns on the surface of the mobile phone protective casing by the interaction of the base coating layer containing the acrylic resin of the polar molecule and acetone of the polar molecule in this process.

Specifically, Figure 1a shows the appearance of acetone dropping, Figure 1b shows the phenomenon that the acetone particles are dispersed in all directions when the deposited acetone touches the base coating layer, Figure 1c shows the dispersed acetone dissolves the base coating layer It is sectional drawing which shows the state which formed the marble pattern of irregular pattern. As shown in Figure 1b, the acrylic resin of the polar molecule constituting the base coating layer and acetone of the polar molecule dissolve each other by interaction, as shown in Figure 1c, a pattern of irregular shape and thickness is formed on the base coating layer. After that, the highly volatile acetone will have a base coating surface as shown in FIG. 1D by natural evaporation. On the other hand, since the P / C surface is protected by the primer layer formed in the preceding process, it is not affected by the use of acetone.

Subsequently, in the present invention, the base coating layer on which the marble pattern is formed is dried, but the present invention is not limited to the drying method, but is dried and cured by drying at 75 to 85 ° C. for 6 to 10 minutes using an infrared lamp in a drying booth. Can be.

And the present invention may further include a step of coating the UV curable resin on the surface of the secondary dried base coating layer, and tertiary drying through ultraviolet irradiation. Through this process, the formed base coating layer can be protected, excellent color and beautiful appearance.

The present invention is not limited to the specific method of coating the UV curable resin, and may be formed by spraying and spraying the UV curable resin at an air pressure of 2 to 4 kg / cm 2 on the surface of the secondary dried coating layer. In addition, the third drying process according to the ultraviolet irradiation is also a conventional method, for example, it can be dried by irradiating with an ultraviolet light amount of 800 ~ 1,100mJ / ㎠.

At this time, it is preferable to limit the thickness of the UV coating layer to be formed in the range of 20 ~ 32㎛, more preferably 25 ~ 32㎛.

On the other hand, Figure 2 is a cross-sectional view of a mobile phone protective casing having a marble pattern manufactured according to an embodiment of the present invention.

As shown in Figure 2, the mobile phone protective casing having a marble pattern of the present invention, the mobile phone protective casing injection (P / C); A primer layer formed on the injection molded product; And a base coating layer formed on the primer layer and having a marble pattern.

Furthermore, a UV coating layer may be further formed on the base coating layer.

Hereinafter, although an Example is given and this invention is demonstrated in detail, this invention is not limited only to these examples.

Example 1

Using the Excelsol 670 (manufactured by SK Corp., Korea), the contaminants on the surface of the injection molded synthetic mobile phone protective casing were removed, and dust was removed using a hand massage using a vibration damping glove. The dust-free mobile phone protection casing was placed on a rotating conveyor at a speed of 1200 rpm using a jig and automatically transferred to a painting line.

Thereafter, with respect to 100% by weight of the chlorinated primer consisting of a chlorinated rubber resin and a solvent, 22% by weight of methyl ethyl ketone, 3% by weight of ethyl acrylate, 7% by weight of normal butanol, 22% by weight of methyl isobutyl ketone, 27% of toluene A chlorinated primer containing a rubber chloride resin commonly used as a% and a residual amount was prepared, and the primary liquid paint was prepared by mixing the chlorinated primer and thinner in an amount of 1: 1.3.

Then, with respect to 100 parts by weight of a solvent and a thermoplastic acrylic resin, 15 parts by weight of methyl ethyl ketone, 7 parts by weight of ethyl acrylate, 20 parts by weight of methyl isobutyl ketone, 22 parts by weight of toluene, dipropylene glycol monomethyl ether acetate ( DPMA) 7 parts by weight and 3 parts by weight of xylene and acrylic resin: beclide carbon silylated resin (VMCH) in a mixture of 6: 4 to 26 parts by weight of a thermoplastic acrylic resin belonging to a weight average molecular weight of 90,000-100,000 g / mol and An acrylic lacquer containing 3 parts by weight of carbon black as a pigment was prepared, and this acrylic lacquer and thinner were mixed in an amount of 1: 1.3 to prepare a secondary liquid paint.

Subsequently, a primer layer having a thickness of 6 μm was formed on the surface of the casing by spraying the primary liquid paint at an air pressure of 3 kg / cm 2 on the surface of the casing which is automatically transferred to the conveyor using a spray gun in a painting room. Then, the resultant was moved to a dry booth and dried for 8 minutes at 80 ° C. using an infrared lamp for the primer layer to cure.

Subsequently, a base coating layer having a thickness of 5 μm was formed by spraying the secondary liquid paint with an air pressure of 3 kg / cm 2 on the surface of the dried primer layer which is automatically transferred to a conveyor using a spray gun in a painting room. Subsequently, before the base coating layer dries, acetone was sprayed on the surface of the base coating layer in the form of raindrops with air pressure of 0.3 kg / cm 2. 3 is a photograph of the surface of the mobile phone protection casing after the base coating layer is formed, and FIG. 4 is an enlarged photograph of FIG. 3, and it can be seen that a marble pattern is formed.

Thereafter, the substrate was moved to a dry booth and cured by drying at 80 ° C. for 8 minutes using an infrared lamp with respect to the base coating layer.

Lastly, spray the UV curable resin at an air pressure of 3 kg / cm 2 onto the surface of the dried casing, which is automatically transferred to the conveyor using a spray gun in a painting room, and then sprays 1,000 mJ / cm 2 according to a conventional method. Irradiation with an ultraviolet light amount was performed. The thickness of the UV coating layer formed after the injection was 30㎛. As a result, it was possible to obtain a mobile phone protective casing having a marble pattern as shown in FIG.

[Example 2]

Except for the use of purple organic pigments instead of carbon black as a pigment used in the production of acrylic lacquer in Example 1 was prepared a mobile phone protective casing according to the same method.

FIG. 6 is a photograph of the surface of the cell phone protective casing after the base coating layer is formed, and FIG. 7 is a photograph of the surface of the cell phone protective casing after the UV coating layer is formed.

As can be seen from the comparison of Figure 6-7, it can be seen that by passing through the UV coating process can be prepared to the surface of the casing having a better gloss and beautiful appearance.

In the present invention, a method of forming a marble pattern on the surface of the mobile phone protective casing, and the surface thereof, but not limited to the mobile phone protective casing, but not limited to an article made of a synthetic resin, such marble pattern forming method can be applied. Can be.

Claims (10)

20-25% by weight methyl ethyl ketone, 1-5% by weight ethyl acrylate, 5-10% by weight normal butanol, 20-25% by weight methyl isobutyl ketone, 25-30% by weight toluene and residual rubber rubber resin After preparing a chloride-based primer, the primer: thinner (Thinner) by mixing in an amount of 1: 1.2 ~ 1: 1.4 to prepare a primary liquid paint;
12-16 parts by weight of methyl ethyl ketone, 5-8 parts by weight of ethyl acrylate, and methyl iso as 100 parts by weight of the solvent and thermoplastic acrylic resin in an acrylic lacker composed of a solvent, a thermoplastic acrylic resin and a pigment. 15-25 parts by weight of butyl ketone, 20-30 parts by weight of toluene, 5-8 parts by weight of dipropylene glycol monomethyl ether acetate (DPMA) and 1-4 parts by weight of xylene, 20-42 parts by weight of the thermoplastic acrylic resin, and Preparing an acrylic lacquer comprising 1-5 parts by weight of a pigment, and then mixing the acrylic lacquer: thinner in an amount of 1: 1.2 to 1: 1.4 to prepare a secondary liquid paint;
Forming a primer layer by coating the primary liquid paint on the outer surface of the cell phone protective casing, and then drying the first liquid; And
After coating the secondary liquid paint on the surface of the primary dried primer layer to form a base coating layer, and then drop the acetone on the surface of the base coating layer with pneumatic pressure of 0.01 ~ 0.5kg / ㎠ to form an irregular marble pattern Method of producing a mobile phone protective casing having a marble pattern comprising ;, the second drying step. The method of claim 1, wherein the addition amount of the rubber chloride resin is 20-29% by weight. The method of claim 1, wherein the thermoplastic acrylic resin is used in an amount of 15-25 parts by weight. The method of claim 1, wherein the thermoplastic acrylic resin is a method of manufacturing a mobile phone protective casing having a marble pattern, characterized in that the acrylic resin: beclide carbonyl vinyl vinyl resin (VMCH) is a mixture of 6: 4. The method of claim 1, wherein the thermoplastic acrylic resin has a weight average molecular weight of 90,000-100,000 g / mol. The method of claim 1, wherein the primer layer and the base coating layer has a thickness of 5 ~ 8㎛ and 3 ~ 6㎛ range, respectively, the method of manufacturing a mobile phone protective casing having a marble pattern. The method of claim 1, further comprising: coating a UV curable resin on the surface of the secondary dried casing, followed by tertiary drying through ultraviolet irradiation. 3. The method of claim 7, wherein the UV coating layer is formed to have a thickness of 20 to 32 μm. Prepared by the method of any one of claims 1 to 8,
Cell phone protective casing injection moldings;
A primer layer formed on the injection molded product; And
And a base coating layer formed on the primer layer and having a marble pattern. 10. The mobile phone protection casing according to claim 9, further comprising a UV coating layer formed on the base coating layer.

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