KR20220114676A - Method for rainbow colar coating on glass article - Google Patents

Abstract

The present invention relates to a rainbow color coating method for a glass container comprising a coating step including a vacuum evacuation step, a surface modification step, an arc ion plating step, and a cooling step, wherein in the arc ion plating step, the coating time, reaction temperature, vacuum degree, and arc current are set so that Ti of a source makes a react with O_2 in the oxygen atmosphere of a chamber, TiO_2 is coated in an uneven thickness on the glass container and the thickness of the thickest part is less than 1000 nm and is transparently coated.

Description

How to coat a glass container with rainbow colors {METHOD FOR RAINBOW COLAR COATING ON GLASS ARTICLE }

The present invention relates to a technology for forming a metallic coating layer on a glass container, and more particularly, a rainbow color using an arc ion plating coating method on the surface of a transparent glass container such as a glass bottle, a wine glass, or a glass glass. It relates to a rainbow color coating method on a glass container to produce a.

Currently, hologram glasses (shown in FIG. 5 for reference), LED light color changing glasses, and rhodium plated glasses are commercially available to give emotions to glasses such as coffee, tea, soju, beer, wine, whiskey and cattail glasses. is becoming

In the 'Rainbow color coating method for glass containers using the PVD vacuum coating method and glass containers manufactured using the same' of patent 101123230000 applied and patented by the applicant of the present invention, translucent or translucent or It is disclosed to obtain an opaque coating layer with a thickness of 0.1 to 10 μm. Here, if the thickness of the coating layer is usually 0.1 μm on a transparent glass article, it is translucent or opaque. Also, only one metallic color can be expressed on the glass article .

Therefore, in wine, whiskey, beer, etc. that are almost transparent, such as commercially available hologram glasses and rhodium-plated glasses as described above, made by a method different from sputtering of PVD, while appreciating the unique color of the contents, the sensitivity of the glass You need the skills to create it.

As for the rainbow color, due to reflection according to the refractive index of light, the color of red, green, blue and yellow is being exhibited in the visible light region. There are high refractive index TiO₂ and low refractive index SiO₂ oxide layers, but these are used for AR coating (anti-reflective coating) by stacking several or tens of TiO₂ and SiO₂ layers for optical coating.

It is necessary to obtain a rainbow coating by using Ti, which has a good supply and demand of materials, is inexpensive, and forms high refractive TiO₂, and is coated with the arc ion plating method, which has excellent adhesion and hardness of the coating layer among PVD methods.

In addition, there is a need for a technology capable of producing a rainbow color by varying the coating thickness for a glass container without damaging the color of the original contents in the glass container.

An object of the present invention is to provide a method for coating a rainbow color on an emotional and luxurious glass container by producing a rainbow color according to the coating thickness in forming a metallic coating layer on a glass container.

Another object of the present invention is to provide a rainbow color coating method on a glass container, which can further improve the hardness of the glass container.

Another object of the present invention is to provide a rainbow color coating method on a glass container that can provide an antibacterial function to the surface of the glass container.

As a means for achieving the above-mentioned "problem to be solved", the present invention provides a rainbow color coating method on a glass container, the method comprising a vacuum evacuation step, a surface modification step, an arc ion plating step and a cooling step In the arc ion plating step, Ti of the source and O₂ react in the oxygen atmosphere of the chamber, so that TiO₂ is coated on the glass container with a non-uniform thickness, and the thickness of the thickest part is coated to less than 1000 nm. It is characterized by setting time, reaction temperature, vacuum degree and arc current.

In a preferred embodiment, it may vary depending on the size of the chamber, but in a general ion plating apparatus, 100 sccm of argon is injected and about 100 sccm of oxygen is injected, and arc current is in the range of 20 to 150A at 3.0x10 ^-3 Torr to 3.0 to x10 ^-2 Torr. Arc discharge is started with furnace and arc ion plating is performed.

In a preferred embodiment, the reaction temperature in the chamber is 100 to 300 °C, and it is preferable to set the coating time to 20 minutes or less.

In a preferred embodiment, the rotation angle of the jig is controlled for non-uniform coating thickness, or when the glass container is mounted on the jig, it is mounted at an angle.

In another embodiment, the coating source is used together with Ti and Si as a coating source so that TiO2 of high refractive index and SiO2 of low refractive index are coated on other parts of the container.

Using the arc ion plating method of the present invention, titanium dioxide, which is made by ionizing inexpensive Ti and combining it with oxygen, is applied to a glass container by varying the coating thickness to produce at least two or more rainbow colors to provide an emotional and luxurious glass container. can do. .

As another effect of the present invention, since TiO2 is deposited, it is possible to further improve the hardness of the glass container and obtain an additional effect of providing an antibacterial function. In addition, it is possible to provide the glass container of the present invention with special colors among the rainbow colors, thereby preventing counterfeiting of the container.

1 is a flowchart showing a rainbow color coating method on a glass container of the present invention.
Figure 2 is a flow chart showing the coating step in the rainbow color coating method on the glass container of the present invention.
3 is a photograph of a cosmetic glass container manufactured according to an embodiment of the present invention.
4 is a photograph of a soju glass manufactured according to an embodiment of the present invention.
5 is a photograph of a holographic glass mentioned in the prior art of the present invention.

Hereinafter, a rainbow color coating method for a glass container using an arc ion plating method among PVD vacuum coating methods according to the present invention and a glass container manufactured using the same will be described in detail.

Advantages and features of the present invention, and methods for achieving them, will become apparent with reference to the embodiments described below in detail and the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only the present embodiments allow the disclosure of the present invention to be complete, and are common in the art to which the present invention pertains. It is provided to fully inform those with knowledge of the scope of the invention, and the present invention is only defined by the scope of the claims.

Here, first, the glass container is a transparent container, and may include a glass bottle, a glass glass, a wine glass, and the like, and by expanding it, a transparent container among products made of resin or other materials should be included in the concept of a glass container.

Arc ion plating according to the present invention has the best adhesion compared to sputtering, resistance heating and electron beam coating methods and is a method capable of strengthening the hardness of the coating layer. And only when Ti is ionized in an oxygen atmosphere, a perfect bond with the dissociated oxygen is made to form a stable oxide.

1 is a flowchart showing a rainbow color coating method on a glass container of the present invention.

Referring to Figure 1, the metallic coating method on a glass container includes a cleaning step of the glass container. In the cleaning step, chipping, stain marks, etc. of the glass container are inspected, and the glass container is stably installed on a jig for cleaning. When installing on the jig, it should be kept at a sufficient distance so that the glass containers do not collide with each other due to the rotation of the jig, and also not float by air buoyancy during cleaning. And ultrasonic cleaning is performed. Ultrasonic cleaning proceeds in steps such as alkali, water washing, alcohol and drying. After that, the presence of foreign substances in the glass container is checked and removed, and if there is chipping, the cleaning step is completed by wiping with a cleaning solution.

Next, a mounting step of mounting the cleaned glass container to a coating jig in a vacuum chamber is included. In the installation step, wear cotton gloves to prevent foreign substances from sticking to the cleaned glass container, mount the surface to be coated in the direction of the coating source, and maintain sufficient separation so that the glass container does not collide with each other when the jig is rotated and moved. If the container is masked, check the masking state.

After the mounting step, a coating step of coating Ti by arc ion plating in an oxygen atmosphere is included.

After the coating step, it includes an inspection step of inspecting for chipping, staining, film removal, dust, etc. on the surface of the coated glass container.

Figure 2 is a flow chart showing the coating step in the rainbow color coating method on the glass container of the present invention.

Referring to FIG. 2 , as a coating step of coating Ti by arc ion plating in an oxygen atmosphere, a plurality of glass containers are mounted on a jig in a vacuum chamber, and Ti is provided as a coating source.

In the coating step of the present invention, closing the door of the vacuum chamber and evacuating the vacuum to the initial vacuum 5X10 ^-5 Torr. At this time, considering that the melting point of the glass container is about 600 ° C, the glass container is heated within the temperature range (room temperature to 200 ° C) at which shrinkage or deformation due to heat does not occur to increase the temperature of the glass container while increasing the temperature of the surface of the glass container or The process (baking) of extracting internal air is performed.

As the next step, a surface modification step is included. By injecting 600 to 1000 sccm of argon, a bias voltage of 200 to 1000 V is applied to the coating jig equipped with a non-conductive glass container to generate plasma. The surface modification is carried out for a short time (several to several tens of seconds). When the voltage is raised to 1000V, arc discharge frequently occurs in the glass container, which is an insulator, and the bias power is cut off by itself. In addition, if the reforming time is long, since the glass container is a non-conductor, arcing may occur and damage to the glass container may occur. In the present invention, if the Ti metal intermediate layer is coated instead of the oxide, the adhesion may be more excellent, but since the transparency of the glass container may be reduced, in the coating of the present invention, the adhesion is modified without using the metal intermediate layer process (etching process) secure from

Finally, the arc ion plating step is included. TiO2 in the glass container reacts with Ti of the source and O2 in the oxygen atmosphere of the chamber, so that TiO2 is coated on the glass container with a non-uniform thickness. Here, up to 300 to 400 sccm of argon and oxygen can be injected depending on the size of the larger chamber, but in the present invention, 100 sccm of argon is injected and about 100 sccm of oxygen is injected, so that the arc current is 20 at 3.0x10 ^-3 Torr to 3.0 x10 ^-2 Torr. Arc ion plating is performed by starting arc discharge in the range of to 150A. At this time, as the color of the rainbow continues to repeat depending on the coating thickness of TiO₂ and the coating thickness becomes thick, it eventually turns black and the internal stress of the oxide decreases, so it should be coated thinly in the range of 1000 nm or less. do.

TiO₂ does not react biologically, so it is harmless to the environment and the human body. It is used as a photocatalyst because of its high oxidizing power. It has a large antibacterial action and also has a sterilization and odor removal function. can be sterilized.

In addition, since the rainbow color is different according to the deposition parameters of TiO 2 by the arc ion plating method, it is different according to variables such as time, temperature, vacuum degree, jig position, jig rotation, and current. It is virtually impossible for anyone to realize the same rainbow color, thereby preventing counterfeiting of glass containers.

Hereinafter, the arc ion plating step will be described in more detail as follows.

Visible light literally refers to light rays that our eyes can see. Among the colors of the rainbow, red has the longest wavelength and purple has the shortest wavelength. That is, if the refractive index of the rainbow color is low, it is red, and if the refractive index is high, it is purple. In the present invention, different rainbow colors are produced by the difference in coating thickness. That is, depending on the coating thickness, at least two or more rainbow colors can be produced, and even all seven colors can be produced.

In the present invention, when TiO₂ is coated on a glass container, it is coated non-uniformly according to the direction and distance of the Ti source. That is, if it is straight and close to the direction of the Ti source, TiO₂ is coated more thickly. Since TiO₂ has a high refractive index, the thicker the coating, the more purple it will be due to diffuse reflection when light is irradiated onto the coated glass container. As the thickness of TiO₂ increases, the refractive index decreases, resulting in a red color. Therefore, when light is irradiated by the difference in refractive index, that is, the difference in the thickness of TiO₂, a rainbow (rainbow) color can be produced by diffuse reflection.

It is very difficult to find the conditions for creating a rainbow color while maintaining the transparency of the glass container in the arc ion plating step. Even if you increase the thickness of the coating, it goes through a translucent green to completely black, resulting in an opaque glass container. Therefore, the coating thickness should be thinly coated in the range of 1000 nm or less which does not impair transparency. In this case, the adhesion of TiO2 is good. In order to make TiO2 thickness in the range of 1000 nm or less in the thickest part, the coating time should be less than 20 minutes. If 20 minutes is exceeded, the transparency of the glass container may be lowered.

As a method of making the coating thickness of TiO2 non-uniform, there is a method of controlling the rotation angle of the rotating jig. When the rotating jig rotates 180 degrees reciprocally, it is thickly coated on the central side and thinly coated on both sides, and hardly coated on the opposite side (see FIG. 3).

Alternatively, it is preferable that the coating thickness of TiO2 is formed in a gradient from the bottom side of the glass container to the inlet side. To this end, when the glass container is mounted on the jig, the bottom side is obliquely disposed close to the Ti source (see Fig. 4). Alternatively, if the side center is placed close to the Ti source, the glass vessel is thicker with TiO2 from the center and thinner towards the inlet and bottom. This coated glass container can produce a double rainbow color.

As a final step, a cooling step of cooling to room temperature in the chamber after coating is included. When a glass container is suddenly exposed to air at a high temperature, the vacuum chamber is opened after cooling to room temperature because it cannot withstand the stress caused by thermal contraction and expansion and is prone to cracks.

In addition, it includes an annealing step of about 30 to 60 minutes at a temperature of 300 to 400 ℃ in a vacuum chamber. In order to be used as a photocatalytic material, anatase, which has stronger oxidation energy than rutile, is widely used for TiO₂. Of course, it is known that the antibacterial properties by the photocatalyst are exhibited even in the anatase and rutile complex structure, but as a way to increase the activity, TiO₂ is coated by ion plating, and then in a vacuum chamber at a temperature of 300 to 400 ° C. It may include annealing for about a minute. By using this method, it is possible to simultaneously realize the beautiful rainbow color and the antibacterial action by the photocatalyst in the thin TiO2 coating layer in a batch process in a vacuum chamber without the need for a separate heat treatment facility.

In another embodiment of the present invention, the coating source is to use Ti and Si. In this case, a coating of TiO2 having a high refractive index and a coating of SiO2 having a low refractive index are formed. In this case, the coating thickness tends to be thick, and if the coating time is set to less than 10 minutes in consideration of transparency, the transparency of the glass container is not impaired, and the TiO2 side is purple and the SiO2 side is red.

Next, conditions suitable for arc ion plating will be described. Conditions to be described later are not limited thereto, and are merely preferred embodiments.

In the present invention, it is preferable to set the reaction temperature to 100 to 300 ℃. Below 100°C, the reaction rate is slow and the adhesion is not good. The higher the temperature, the better the adhesion, but at 300°C or more, the glass container may be deformed. The coating time is preferably set to 20 minutes or less. In 1 to 2 minutes, at least two or more rainbow colors can be obtained very thinly. If it exceeds 20 minutes, the transparency of the transparent glass container is reduced.

And, the degree of vacuum inside the chamber is preferably 3.0x10 ^-3 Torr to 3.0x10 ^-2 Torr to be maintained. This is lower than the vacuum degree of sputtering 1.0x10 ^-3 to 6.0x10 ^-3 Torr. This is because the arc discharges well when the pressure is high (the vacuum degree is low). At a vacuum degree of 3.0 to x10 ^-2 Torr or less, it is difficult to increase the coating thickness because the mean free path is short. That is, because there are too many particles, they cannot be blown away by collision. And at 3.0x10 ^-3 Torr or higher, it may be affected by impurities or foreign substances.

And, it is preferable to set the arc current in the range of 20 to 150A. Below 20A, arc discharge of a small number of arcs is not maintained well, and when it is about 150A or more, a lot of Ti lumps called microparticles are emitted, making the surface not smooth and rough.

Next, the coating time, reaction temperature, vacuum degree, and arc current should be set so that the thickness of the thickest part of the coating layer is 1000 nm or less within the above-mentioned ranges. The important point here is that if the thickness of the coating layer is uniform, the rainbow color cannot be produced. In the present invention, it should be coated with a non-uniform thickness.

As described above, by using the arc ion plating method according to the present invention, if there is no light in the glass container, it is maintained in a transparent state, and when light is exposed, a rainbow color can be produced, and the hardness of the glass container is further strengthened and antibacterial It also has a function, so it can be applied to various glass containers.

3 is a photograph of a cosmetic glass container manufactured according to an embodiment of the present invention.

As can be seen from FIG. 3 , when light is received, TiO2 has a yellow color in the middle thickness and purple in the thick thickness. As you can see here, it can be seen that the rainbow color is produced while maintaining the transparency.

4 is a photograph of a soju glass manufactured according to an embodiment of the present invention.

As can be seen from FIG. 4 , the upper part has a blue color at the intermediate or higher coating thickness of TiO₂, and the lower part has a purple color at the thick coating thickness. Some parts are very little coated or not, so if a soju glass is filled with soju, the original transparent liquid color of soju can be produced in a certain part.

The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments and may be modified in various other forms, and those of ordinary skill in the art to which the present invention pertains. It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

Claims (7)

A rainbow color coating method on a glass container comprising a coating step comprising a vacuum evacuation step, a surface modification step, an arc ion plating step and a cooling step,
In the arc ion plating step, Ti of the coating source and O₂ react in the oxygen atmosphere of the chamber, so that TiO₂ is coated on a glass container with a non-uniform thickness, and the coating time, reaction temperature A method of coating a rainbow color on a glass container, characterized by setting the vacuum degree and arc current. According to claim 1,
100 sccm of argon is injected into the chamber, 100 sccm of oxygen is injected, and arc ion plating is performed by starting arc discharge with an arc current in the range of 20 to 150A at a vacuum degree of 3.0x10 ^-3 Torr to 3.0 x10 ^-2 Torr. How to coat the container with rainbow colors. According to claim 1,
The reaction temperature in the chamber is 100 to 300 ℃, the coating time is a rainbow color coating method on a glass container, characterized in that set to 20 minutes or less. According to claim 1,
Rainbow color coating method on a glass container, characterized in that the rotation angle of the jig is controlled for the non-uniform coating thickness or the glass container is mounted at an angle when the glass container is mounted on the jig. According to claim 1,
Rainbow color coating method on a glass container, characterized in that the coating source is used together with Ti and Si as a coating source so that TiO₂ of high refractive index and SiO₂ of low refractive index are coated on other parts of the container. According to claim 1,
Rainbow color coating method on a glass container, characterized in that it further comprises an annealing step of 30 to 60 minutes at a temperature of 300 to 400 °C in a vacuum chamber. A glass container manufactured by a rainbow color coating method on the glass container of any one of claims 1 to 6.

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