KR101458743B1 - Coating method of vessel having uv-shielding effect - Google Patents

Abstract

Disclosed is a method to coat a container to apply UV-shielding functions, wherein the container is made of general plastic or glass, and a coating layer is formed on the surface of the container such that the container is converted into a UV-shielding functional product. To achieve this, the method of the present invention comprises: a container preparing step of preparing a container; a primer step of producing a primer coating layer by coating the surface of the container with a primer consisting of a solvent, silane, and acetic acid; a first coating step of producing a first coating layer by coating the surface of the container with a first coating agent including alumina powder; and a second coating step of producing a second coating layer by coating the surface of the container with a second coating agent including a UV-shielding agent. By means of the present invention, excellent UV-shielding functions can be exhibited compared to an existing UV-shielding agent, such that the container of the present invention can usefully be used as a storing container for beer, tea, coffee, and juice which are sensitive to UV rays.

Description

TECHNICAL FIELD [0001] The present invention relates to a coating method for imparting an ultraviolet shielding function,

The present invention relates to a container coating method for imparting an ultraviolet shielding function so that ultraviolet rays are not transmitted to the interior of a container, and more particularly, And a container coating method for imparting an ultraviolet shielding function for forming a coating layer.

Many products, such as certain fruit juices, soft drinks, beer, wine, groceries, dairy products, cosmetics, vitamins and pharmaceuticals, are packaged in ultraviolet light-permeable glass or plastic containers that are subject to ultraviolet light alteration, discoloration and degradation.

These ultraviolet rays have shorter wavelengths and higher energy than visible light or infrared rays, and change or alter organic matter. Specifically, ultraviolet rays can be divided into ultraviolet rays A (320 to 400 nm), ultraviolet rays B (280 to 320 nm), and ultraviolet rays C (200 to 280 nm).

The ultraviolet C region has the largest energy among ultraviolet rays, but most of the ultraviolet region C is removed by the ozone layer and does not reach the ground surface. The ultraviolet B region is a region where an image can be generated by sunlight. It is known to act as a causative cause.

In addition, since ultraviolet rays are energetic, they activate various chemicals to change their structure or paralyze their functions.

Therefore, the conventional invention is to prevent the harmful ultraviolet ray of 320 to 400 nm by making the beverage container with a resin containing the ultraviolet ray blocking agent or by performing the surface treatment of the packaging material and the storage container with the ultraviolet ray blocking agent to prevent the inherent taste, color, The breakdown phenomenon was prevented.

However, the inorganic ultraviolet scattering agent added for ultraviolet ray shielding has scattered the light of an infrared (IR) heater in the heating process during preform blowing, thereby exposing a problem that the formability of the container is poor.

Korean Patent Publication No. 10-2010-0101857 (published on September 20, 2010) Korean Patent Publication No. 10-2003-0090565 (published on November 28, 2003)

Accordingly, an object of the present invention is to provide a container coating method for introducing a specific ultraviolet screening agent into the surface of a container to provide an ultraviolet screening function capable of protecting the taste and quality of beer and other beverages from ultraviolet rays.

In order to achieve the object of the present invention, in one embodiment of the present invention, there is provided a method of preparing a container, comprising the steps of preparing a container for preparing a container, and applying a primer composed of a solvent, silane and acetic acid to the surface of the container to form a primer coating layer A first coating step of coating a surface of the container with a first coating agent containing alumina powder to form a first coating layer and a second coating agent containing a UV blocking agent on the surface of the container to form a second coating layer, And a second coating step of forming a coating layer on the substrate.

INDUSTRIAL APPLICABILITY The present invention can exhibit a superior level of ultraviolet barrier property to a conventional ultraviolet screening agent, and thus can be effectively used in storage containers such as beer, tea, coffee, and juice sensitive to ultraviolet rays.

In addition, the present invention can enhance the rigidity of the container by using the inherent properties of alumina, and can impart a clean color to the surface of the container compared to the general ultraviolet barrier layer.

1 is a flow chart illustrating a container coating method according to an embodiment of the present invention.
2 is a schematic view for explaining a container coating method according to an embodiment of the present invention.
3 is a flow chart illustrating a container coating method according to another embodiment of the present invention.
4 is a schematic view for explaining a container coating method according to another embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a container coating method (hereinafter, referred to as a 'container coating method') for providing an ultraviolet shielding function according to preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a flow chart illustrating a container coating method according to an embodiment of the present invention.

Referring to FIG. 1, a container coating method according to an embodiment of the present invention includes a container preparing step S100 for preparing a container, a primer step S200 for forming a primer coating layer on the surface of the container, A first coating step (S100) of forming a first coating layer containing alumina powder on the outside, and a second coating step (S400) of forming a second coating layer on the outside of the first coating layer.

This container coating method includes a primer booth 210 providing a space for coating a paint, a first booth 310 installed at a rear end of the primer booth 210, a second booth 310 installed at a rear end of the first booth 310, 2 booth 410, and each booth may be provided with a plurality of spray injectors for applying a coating agent and a paint to the surface of the vessel.

Hereinafter, each of the components shown in the drawings will be referred to and each step will be described in more detail. 2 is a schematic view for explaining a container coating method according to an embodiment of the present invention.

Referring to FIG. 1, a container coating method according to the present invention includes a container preparation step (S100).

The container preparing step S100 is a step of putting the container into the container holder 110 installed on the conveyor for automatically moving the container along the conveyor.

In this case, synthetic resin or glass may be used as the material of the container, and general glass products such as ordinary glass, tempered glass and laminated glass can be used for the glass, and synthetic resin such as polycarbonate, acrylic, polyethylene terephthalate, Can be used.

If necessary, the container preparation step (S100) may further include a container cleaning process and a surface treatment process of the container.

In the cleaning process, foreign substances remaining on the surface of the container are removed using a method such as alcohol cleaning, detergent cleaning, ultrasonic cleaning, etc. through the container washing machine 120 located on the moving path of the container. After the pretreatment by the above cleaning method, antistatic treatment may be performed to remove foreign matter, dust, and the like.

In the surface treatment process, the surface of the container is roughened by a sand blast operation in order to increase the adhesion of the coating, or the surface of the metal is corroded by a chemical etching operation, The surface is roughened.

For example, in order to perform a surface treatment process, a flame processor 130 is disposed on a moving path of a container that is automatically moved along a conveyor, a gas pipe 150 is installed in the flame processor 130, And the gas reservoir 140 may be connected to the end of the gas reservoir 150. In other words, the flame processor 130 supplies the stored gas from the gas reservoir 140 through the gas piping 150, generates a flame, and performs a surface treatment by spraying a flame into a container passing around along the conveyor.

Referring to FIG. 1, a container coating method according to the present invention includes a primer treatment step (S200).

The primer treatment step (S200) is a step for forming a primer coating layer on the surface of the container. To this end, a process of applying a primer to the surface of the container and a process of drying the applied primer are performed.

At this time, the primer is a liquid material to be coated first on the surface of an object in order to protect the surface of the object from corrosion or physical impact and smoothly carry out subsequent coating, It is preferable to use a primer in which 450 to 550 parts by weight of a solvent such as water and 2 to 4 parts by weight of acetic acid are mixed with 10 parts by weight of silane.

More specifically, in the process of applying the primer, a primer is applied to the surface of the container through spray coating. As shown in FIG. 2, a sprayer 240 ). ≪ / RTI >

At this time, a plurality of the spray injectors 240 may be installed in the interior of the primer booth 210 or adjacent to the primer booth 210. The spray injector 240 is connected to the primer reservoir 220 through which the primer is stored. In addition, the piping is provided with a primer pump 230 that provides pressure to provide the primer stored in the primer reservoir 220 to the sprayer 240.

A compressed air injection pipe 930 for supplying compressed air of a predetermined pressure is connected to the spray injector 240 and a compressor 910 for supplying compressed air to the end of the compressed air injection pipe 930 is installed . An air dryer 920 may be installed at one side of the compressed air injection pipe 930 to remove moisture of the air injected into the compressed air injection pipe 930 by the compressor 910.

The process of drying the coated primer is a process of applying a primer to a primer coated on the surface of the container to form a primer coating layer. The primer is dried for about 10 minutes at room temperature (about 25 ° C to 30 ° C) Followed by drying.

Referring to FIG. 1, a container coating method according to the present invention includes a first painting step S300.

The first coating step S300 is a step of forming a first coating layer containing alumina powder on the surface of the container. To this end, a first coating material containing alumina powder is coated on the surface of the container, Is performed.

At this time, the alumina powder is formed as a smooth continuous layer on the surface of the container so that the UV screening agent formed on the surface of the container through the secondary coating step (S400) can be uniformly applied. In addition, alumina powder provides flexibility to the first coating layer to prevent the peeling phenomenon from occurring on the surface of the container having various curves, so that the first coating layer can be firmly held.

To this end, the first coating agent may be configured to include 80 to 120 parts by weight of the first binder and 40 to 60 parts by weight of the first diluent in 10 parts by weight of the alumina powder.

For example, the first binder may be a mixture of a mixture of an acrylic resin, an epoxy resin, and a melamine resin, which can be used for drinks, and a mixture of xylene, n-butyl alcohol, and methyl isobutylketone Can be used. More specifically, the first binder comprises from 65 to 70% by weight of an acrylic resin, from 3 to 8% by weight of an epoxy resin, from 3 to 8% by weight of a melamine resin, from 1 to 5% by weight of n-butyl alcohol, from 5 to 10% And 1 to 5% by weight of methyl isobutyl ketone.

And the first diluent comprises 65 to 75% by weight of toluene, 5 to 15% by weight of ethyl acetate, 5 to 15% by weight of butyl cellosolve, 5 to 15% by weight of methyl isobutyl ketone %. ≪ / RTI >

The first binder serves to bond the alumina powder to the surface of the container through the interface between the alumina powder and the surface of the container.

As shown in FIG. 2, the first coating 310 is coated on the primer booth 210 along with the conveyor, as shown in FIG. 2, The first coating agent is injected through the first spray injector 340 into the container.

At this time, a plurality of the first spray injectors 340 may be installed in the first booth 310 or adjacent to the first booth 310. The first spray injector 340 is connected to the first reservoir 320 through which the first coating material is stored. In addition, the piping is provided with a first pump 330 that provides pressure to provide a first coating sprayer 340 with the first coating stored in the first reservoir 320.

The compressed air injection pipe 930 and the compressor 910 are connected to the first spray injector 340, like the spray injector 240 described above.

The first coating agent applied on the primer coating layer is applied to the first heating furnace 350 provided at the rear end of the first booth 310 through the first heating furnace 350, To 100 < 0 > C for about 3 minutes to form a first coating layer. If necessary, the process may further include a drying process for drying the moisture remaining in the first coating layer so that the first coating layer is not deformed by the second coating material applied in the second coating step.

Referring to FIG. 1, a container coating method according to the present invention includes a secondary painting step S400.

The second coating step (S400) is a step of creating a second coating layer for imparting an ultraviolet shielding function to the surface of the container. To this end, a second coating agent containing ultraviolet rays (UV) And firing the second coating agent.

As such, the second coating layer is formed through the second coating material uniformly coated on the surface of the first coating layer, and functions to block ultraviolet rays from entering the first coating layer.

To this end, the second coating agent may be constituted to include a UV screening agent, a second binder and a second diluent, and the UV screening agent may include 0.2 to 0.6% by weight in 100% by weight of the second coating agent. If the content of the UV blocking agent is less than 0.2% by weight, the UV blocking effect can not be exhibited. If the content of the UV blocking agent is more than 0.6% by weight, it is not preferable from the viewpoint of cost.

Any UV blocking agent may be used as long as it is capable of reflecting or absorbing ultraviolet rays introduced into the container. Preferably, benzotriazole is dispersed in solid paraffin wax and further processing aid is added. Benzoxazinone may be used in addition to benzotriazole.

The second binder and the second diluent may be the same materials as the first binder and the second diluent.

The second coating agent is coated on the surface of the container through electrostatic coating. As shown in FIG. 2, in the first booth 310 to the second booth 410 The second coating agent is injected through the second spray injector 440 and a voltage is applied to the surface of the container to adsorb the second coating agent on the surface of the container.

At this time, a plurality of the second spray injectors 440 may be installed inside the second booth 410 or adjacent to the second booth 410. And the second spray injector 440 is connected to the second reservoir 420 through which the second coating material is stored. In addition, a second pump 430 is provided in the tubing to provide pressure to provide a second coating agent, stored in the second reservoir 420, to the second sprayer 440.

The compressed air injection pipe 930 and the compressor 910 are connected to the second spray injector 440 in the same manner as the spray injector 240 described above.

The second coating material is applied to the second coating material by coating the second coating material coated on the surface of the first coating material through a second heating furnace 450 installed at the rear end of the second booth 410 Followed by baking at 80 to 100 DEG C for about 3 minutes to produce a second coating layer. If necessary, the process may further include a drying process for drying the moisture remaining in the second coating layer so that the second coating layer is not deformed by the coating material applied in the third coating step.

FIG. 3 is a flowchart illustrating a method of coating a container according to another embodiment of the present invention, and FIG. 4 is a schematic view illustrating a method of coating a container according to another embodiment of the present invention.

Referring to FIG. 3, the container coating method according to the present invention may further include a third painting step (S500).

The third coating step (S500) is a step of forming a third coating layer for imparting hue to the surface of the container. To this end, a coating is applied to the surface of the container and the coating is baked.

As such, the third coating layer is formed through a coating uniformly coated on the surface of the second coating layer to provide a function of imparting color to the container through self-developed color. At this time, any material may be used as the coating material for the beverage container.

If necessary, the coating material may be mixed with 1 to 10% by weight of at least one selected from the group consisting of dyes, pearls, silver, metallic and gold.

Meanwhile, the process of applying the paint is a process of applying paint on the surface of the container through electrostatic coating. As shown in FIG. 4, the paint is moved along the conveyor from the second booth 410 to the third booth 510 The paint is sprayed to the container through the third spray sprayer 540, and a voltage is applied to the surface of the container to adsorb the paint to the surface of the container.

At this time, a plurality of the third spray injectors 540 may be installed inside the third booth 510 or adjacent to the third booth 510. The third spray sprayer 540 is connected to the paint reservoir 520 through which the paint is stored. The pipe is also provided with a paint pump 530 that provides pressure to provide paint stored in the paint reservoir 520 to the third spray sprayer 540.

The compressed air injection pipe 930 and the compressor 910 are connected to the third spray injector 540 in the same manner as the spray injector 240 described above.

In the process of baking the applied coating material, the coating material applied on the surface of the second coating layer is applied to the surface of the second booth 510 at a temperature of 205 to 220 ° C in a central heating furnace 600, Min to produce a third coating layer. If necessary, the third coating step S500 may further include a cooling process for passing the cooling booth 700 that stabilizes the mechanical characteristics of the third coating layer so that the third coating layer is not deformed at room temperature.

Referring to FIGS. 1 and 3, the container coating method according to the present invention may further include a container removing step.

The step of removing the container is a step of separating the coated container from the container holder 110. Such a container unloading step may be manually performed through a manpower, or may be automatically carried out through a container separating apparatus.

Hereinafter, specific examples and experimental examples of the present invention will be described in more detail. It should be understood, however, that the embodiments and examples are for the purpose of promoting understanding of the specific examples of the invention described above, and the scope of rights and the like should not be construed thereby.

Preparation of first and second binders

First and second binders were prepared by mixing 14 kg of acrylic resin, 1.4 kg of epoxy resin, 1.4 kg of melamine resin, 800 g of n-butyl alcohol, 1.7 kg of xylene and 700 g of methyl isobutyl ketone.

Manufacture of primers

100 g of silane, 5 kg of distilled water and 30 g of acetic acid were mixed to prepare a primer.

Preparation of primary coating solution

A first coating solution was prepared by mixing 6 kg of the first binder and 3 kg of the first diluent (HT 016 Shinna, Chubu Eskem Co., Korea) to 600 g of the alumina powder.

Preparation of secondary coating liquid

A second coating solution was prepared by mixing 6 kg of a second binder and 4 kg of a second diluent (HT 016 Shinna, Chubu Eskem Co., Korea) to 480 g of a UV blocking agent [benzotriazole].

[Example 1]

1. A PET container having a thickness of 0.38 mm was produced from PET resin.

2. A primer prepared in advance on the surface of the PET container was applied through spray coating and then dried to form a primer coating layer.

3. The primary coating solution prepared in advance on the surface of the container having the primer coating layer formed thereon was applied by spray coating and then baked at 90 캜 for 3 minutes in a heating furnace to form a primary coating layer.

4. A second coating solution prepared in advance on the surface of the container having the first coating layer formed thereon was applied through electrostatic coating and then baked at 90 캜 for 3 minutes in a heating furnace to form a secondary coating layer.

[Comparative Example]

508.47 g of PET resin and 1.53 g of benzotriazole were mixed to prepare a 0.38 mm thick UV-blocking transparent PET container.

[Experimental Example]

The PET containers prepared through Examples and Comparative Examples were irradiated with ultraviolet rays of 380 nm and their transmittance was measured. The results are shown in Table 1 below.

380 nm UV transmittance Example 3.5% Comparative Example 12%

UV transmittance comparison

[Table 1] Referring to Table 1, the container having the coating layer formed by performing the primer process and the first and second coating processes on a container made of a synthetic resin has a lower ultraviolet transmittance than the container formed of a mixture of the ultraviolet screening agent and the synthetic resin Respectively.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined in the appended claims. It can be understood that it is possible.

110: container holder 120: container washing machine
130: Flame processor 140: Gas storage
150: gas piping 210: primer booth
220: primer reservoir 230: primer pump
240: Spray injector 250: Heating furnace
310: First booth 320: First storage
330: first pump 340: first spray sprayer
350: first heating furnace 410: second booth
420: second reservoir 430: second pump
440: Second Spray Injector 510: Third Booth
520: paint reservoir 530: paint pump
540: Third spraying sprayer 600: Central heating furnace
700: Cooling booth 800: Container separator
910: Compressor 920: Air dryer
930: Compressed air injection pipe

Claims (8)

Preparing a container for preparing the container;
A primer step of applying a primer composed of a solvent, silane and acetic acid to the surface of the container to produce a primer coating layer;
A first coating step of applying a first coating agent containing alumina powder to the surface of the container to form a first coating layer; And
And a second coating step of applying a second coating agent containing a UV blocking agent to the surface of the container to form a second coating layer. The method of claim 1, wherein after the secondary painting step
Further comprising a third coating step of coating a surface of the container with a paint to form a paint coating layer. The method according to claim 1, wherein the primer
Wherein the silane is prepared by mixing 450 parts by weight of a solvent and 2 to 4 parts by weight of acetic acid in 10 parts by weight of silane. The method according to claim 1,
Wherein the primary coating step uses a spray coating, and the secondary coating step uses an electrostatic coating. The method of claim 1, wherein the vessel preparation step
The vessel cleaning process, and
And a surface treatment process of the container for roughening the surface of the container in order to increase the adhesion of the coating. 6. The method according to claim 5,
Wherein the surface of the container is flame treated through a flame processor installed on a moving path of the container which moves automatically along the conveyor. The method of claim 1, wherein the first coating comprises
Wherein the alumina powder comprises 80 to 120 parts by weight of the first binder and 40 to 60 parts by weight of the first diluent in 10 parts by weight of the alumina powder. The composition of claim 1, wherein the UV blocker
And 0.2 to 0.6% by weight of the second coating agent is contained in the second coating agent.

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