JP2001072441A - Production of colored glass bottle and colored glass bottle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing an evenly colored glass bottle by covering the bottle with a colored coating film without coloring the bottle itself, and to provide the colored glass bottle. SOLUTION: This method for producing a colored glass bottle comprises coating a glass bottle 2 with a clear thermosetting acrylic resin to form a resin coating layer 4, preliminarily thermally setting the resin coating layer at 60 to 140 deg.C, dipping the resin coating layer in a dyeing liquid to dye the coating layer, and then subjecting the coated glass bottle to a standard thermal setting treatment at 150 deg.C. A protecting coating layer is preferably formed on the dyed coating layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for uniformly coloring a glass bottle without unevenness.

[0002]

2. Description of the Related Art Many types of glass bottles are used in various fields, and the glass bottles are colored in various colors depending on purposes. The conventional glass bottle 1 shown in FIG. 4 is a bottle obtained by adding a material for forming a color to a glass raw material. The material from which the color develops depends on the color, but iron oxide, cobalt oxide and the like are added. In this case, the coloring is performed over the entire thickness of the bottle, and the unevenness in the thickness is less than doubled in an ordinary bottle, so that the unevenness in the color is relatively small.

However, if the glass bottle is to be recycled and reused as a raw material for another bottle, the bottle itself is colored and it is difficult to decolorize it. This is one of the factors that requires sorting costs and hinders recycling. In addition, the coloring of the glass itself that forms the bottle requires color change of the glass melting furnace when forming a small lot bottle, which causes a decrease in productivity and a decrease in yield due to the color change work. It has become.

On the other hand, as a coloring method for facilitating recycling of colored glass bottles, a coloring coating by a sol-gel method has been developed. FIG. 5 shows a colored glass bottle obtained by the sol-gel method, which is obtained by dispersing an organic pigment in a hybrid film of vitreous and organic materials on the outer surface of a commercially available colorless glass bottle 2 and having a thickness of about 1 to 2 μm. This is a method of coloring by stretching the film 3 having a thickness.

[0005] In this case, since color development is performed over the entire film thickness, the film thickness unevenness of the film adhered to the surface of the glass bottle becomes color unevenness as it is. In the case of a bottle having a complicated shape, it is extremely difficult to reduce the film thickness unevenness to twice or less of the film thickness, which hinders the practical application of a coloring technique for producing a high-quality colored bottle without color unevenness by a coating method. I was

[0006]

SUMMARY OF THE INVENTION In view of the above-mentioned prior art, the present invention is to produce a glass bottle which is covered with a colored coating film and is uniformly colored without coloring the glass bottle itself. It is an object to provide a method and such a glass bottle.

Another object of the present invention is to provide a method for producing a colored glass bottle capable of forming a colored coating layer on a glass bottle with good adhesiveness and providing a colored glass bottle that can be used for a long time.

[0008]

In order to solve the above-mentioned problems, the present invention provides a method for producing a colored glass bottle by forming a resin coating layer on a glass bottle and then coloring the resin coating layer by coloring. I do.

In the method for producing a colored glass bottle according to the present invention, in order to dye the resin coating layer formed on the glass bottle, the resin coating layer is preheat-cured at a temperature lower than the standard heat-curing temperature and then dyed. ,
Thereafter, it is preferable to perform a heat curing treatment at a standard heat curing temperature.

That is, when the resin coating layer is finally heat-cured at a standard heat-curing temperature, there is no diffusion path for dye molecules in the resin coating layer and dyeing is not properly performed. It is preferred that the dyeing be carried out after the preliminary heat-curing treatment at a temperature lower than the heat-curing temperature, followed by a standard heat-curing treatment. The pre-curing needs to be performed to such an extent that the coating layer does not swell or melt out by the dyeing operation.

In the method for producing a colored glass bottle according to the present invention, a resin coating layer is formed on the glass bottle, and then the coating layer is colored by dyeing. The unevenness of the thickness of the resin coating layer formed on the glass bottle does not affect the color unevenness, and the resin coating layer can obtain a uniform coloration and obtain a good colored bottle without color unevenness. it can.

In the method for producing a colored glass bottle according to the present invention, a thermosetting acrylic resin clear can be used as the resin coating layer formed on the glass bottle. In this case, the above-mentioned preliminary heat curing treatment is performed at 60 to 140 ° C.
It is preferred to carry out at a temperature of

In the method for producing a colored glass bottle according to the present invention, a melamine resin baked coating can be used as a resin coating layer formed on the glass bottle.
It is preferably carried out at a temperature of up to 120 ° C.

Further, in the method for producing a colored glass bottle according to the present invention, the surface of the glass bottle is roughened by sandblasting or the like so as to improve the adhesion between the resin coating layer formed on the glass bottle and the glass bottle and prolong the life of the colored bottle. Preferably, the resin coating layer is formed. When the resin coating layer is formed by melamine resin baking coating, first, the surface of the glass bottle is coated with a primer obtained by diluting a silane coupling agent with a solvent, and then the melamine resin baking coating is performed. This is preferable because the adhesion of the layer is improved.

In the method for producing a colored glass bottle according to the present invention, after the resin coating layer formed on the glass bottle is dyed, a protective coating layer such as a melamine resin baking clear coating layer is formed on the dyed coating layer. Then, the deterioration of the appearance of the colored layer can be prevented.

[0016] The colored glass bottle produced by the method of the present invention as described above can be reused without special sorting work because the coating layer can be removed by heat treatment in the recycling stage.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be specifically described based on embodiments.

(First Embodiment) First, the first embodiment shown in FIG.
An embodiment will be described. In FIG. 1, reference numeral 2 denotes a commercially available colorless glass bottle. Reference numeral 4 denotes a resin coating layer composed of a thermosetting acrylic resin clear coating layer coated on the outer surface of the glass bottle 2 and has a thickness b.
And Reference numeral 5 denotes a colored layer in which the metal complex type dye has penetrated in the coating layer 4, and its depth is represented by a.

Next, a description will be given of a construction process when the coating layer 4 having the coloring layer 5 is formed as described above. A colorless glass bottle 2 shown in FIG. 1 was prepared, and degreased with a solvent to remove surface stains. After drying, a thermosetting acrylic resin clear was spray-coated at room temperature to about 20 μm to form a resin coating layer 4 to be dyed. Thereafter, the coating layer 4 was cured by heating at 150 ° C., which is a standard curing condition, for 20 minutes, and then immersed in a normal temperature dyeing solution having the composition shown in Table 1 for 20 minutes for dyeing. However, the result was hardly stained.

[0020]

[Table 1] The reason that the coating layer 4 is not dyed is that the dyeing speed is determined by the diffusion of dye molecules or ions in the chromosome, and the coating layer 4 is formed by curing treatment of the coating layer 4. It was considered that there was no longer a diffusion path for dye molecules in the thermosetting acrylic resin clear coating layer.

Therefore, the same dyeing was attempted after the heat-curing treatment at a temperature lower than the standard heat-curing treatment temperature (heating time was set to 20 minutes). The heat curing treatment to be performed is referred to as a preliminary heat curing treatment). As a result, the result shown in FIG. 2 was obtained. In FIG. 2, the evaluation of whether or not the dyeing is possible is somewhat subjective in comparison with a color sample, but was evaluated by the immersion time at which the target color was considered to be obtained.

For example, the temperature of the pre-heating and curing treatment is 100 ° C.
In this case, the immersion time for obtaining the target color was 20 minutes. As the temperature of the pre-heating and curing treatment decreased, the dyeable time became shorter. However, when the temperature of the pre-heating and curing treatment was lower than 60 ° C., the coating layer was swollen or melted out and dyeing was impossible.

As described above, in the case of a thermosetting acrylic resin clear, the preheating and curing temperature is set to 60 to 1 for dyeing.
It has been found that the temperature should be about 30 ° C. In addition, since the dyed coating layer 4 is still insufficiently cured, after dyeing, excess dyeing liquid is washed away with water, and then, at a standard heat-curing treatment temperature in order to secure mechanical properties as a resin layer. Rebaking treatment was performed at a certain 150 ° C. for 20 minutes.

The coloring state of the coating layer 4 obtained as described above was very good without color unevenness. This is because the permeation of the dye is performed not at the entire thickness of the coating layer 4 but at a uniform depth from the surface, and the uneven thickness of the coating layer 4 does not affect the color unevenness.

It should be noted that the penetration depth of the dye depends on the coating layer 4.
Even when the film thickness is slightly larger than the film thickness, the concentration distribution of the dye decreases in the depth direction, so that the influence on the color unevenness is caused by coloring coating by the sol-gel method in which the pigment is uniformly distributed over the entire film. In comparison, the method by dyeing according to the present invention is extremely superior to color unevenness.

In the above test, all the dyeing was carried out with a dye solution at room temperature. However, by raising the temperature of the dye solution, the dyeing time can be shortened. The time of the pre-heating and curing treatment was set to 20 minutes, but this time also depends on the temperature of the pre-heating and curing treatment, and it is necessary to shorten the time when the temperature of the pre-heating and curing treatment is high.

(Second Embodiment) In the first embodiment, a thermosetting acrylic resin clear is used for the coating layer 4. In the second embodiment, a melamine resin, which is another resin, is baked on the coating layer 4. An example using clear will be described. The configurations of the glass bottle 2 and the coating layer 4 are the same as those in FIG.

As in the case of the first embodiment, a glass bottle was coated with a baked clear melamine resin of about 20 μm by spraying. Next, the relationship between the preheating and curing temperature (time was 20 minutes) of the coating resin and the dyeing time was examined. The composition of the staining solution is the same as in Table 1.

The results are shown in FIG. As a result, the same behavior as that of the thermosetting acrylic resin clear was exhibited in the case of the present resin. However, the appropriate temperature range was somewhat lower than that of the first embodiment, that is, 50 to 120 ° C. Next, as a treatment, an excess dyeing solution was removed, and the material was cured by heating to 130 ° C., which is a standard temperature of the heat curing treatment, for 20 minutes. The quality of the colored bottle thus obtained was excellent without uneven color.

(Third Embodiment) In the above embodiment, the adhesion between the glass bottle 2 and the resin coating layer 4 made of an organic material is not always good. It is desirable to improve the adhesion.

Therefore, in the present embodiment, sandblasting is performed on the surface of the glass bottle 2 to improve the adhesiveness, and thereafter, resin coating formation, preliminary heat curing, dyeing, and standard heat curing are performed. Note that this embodiment is the same as the first and second embodiments except that the glass bottle 2 is subjected to sandblasting before coating with a coloring resin.

(Fourth Embodiment) In the present embodiment, a silane coupling agent (KBM403 (Shin-Etsu Chemical Co., Ltd.) is applied to the surface of the glass bottle 2 to improve the adhesion between the glass bottle 2 and the melamine resin clear coating layer as an organic material. A primer prepared by diluting the product name))) with a solvent was coated, and dried at 80 ° C. for about 5 minutes to obtain a base treatment. After that, the same processing as in the second embodiment is performed, and the glass bottle 2 is processed.
A colored coating was completed.

The silane coupling agent has two kinds of functional groups and improves the adhesion between the glass bottle 2 and the organic material which is the resin coating layer, thereby extending the peeling life of the colored coating layer. I can do it.

(Fifth Embodiment) FIG. 3 shows a colored glass bottle according to a fifth embodiment. In FIG. 3, reference numeral 2 denotes a colorless glass bottle. Reference numeral 4 denotes a melamine resin baked clear coating layer coated on the glass bottle 2 by a spray method and has a thickness of about 20 μm. 5 is 2 at 100 ° C
This is a dye penetrating layer formed by immersion dyeing in the dyeing solution shown in Table 1 for 20 minutes after the preliminary heat curing treatment for 0 minutes.

Reference numeral 6 denotes a protective layer of a melamine resin baked clear coating having a thickness of about 5 μm coated on the coating layer 4 to protect the dyed layer 5. After dyeing, the protective layer 6 is washed with water to remove excess dyeing liquid on the surface,
It was dried and then coated with the same material and the same coating method as the melamine resin baked clear coating 4, and then cured at 130 ° C. for 20 minutes. Thereby, deterioration of the appearance of the colored layer due to scratches during use of the bottle can be largely prevented. The method of the present embodiment can be applied to other than melamine resin baked clear coating.

As described above, the present invention has been specifically described based on the illustrated embodiments. However, the present invention is not limited to these embodiments, and the specific configuration thereof is within the scope of the present invention shown in the claims. Of course, various changes may be made in the manner.

For example, in the above-described embodiment, the case where the resin coating layer for the glass bottle is formed by a thermosetting acrylic resin clear and melamine resin baking coating has been described. Of the resin.

As the coloring dye, an appropriate dye may be used in addition to those described in the above embodiment.

[0039]

As described above, the present invention provides a method for producing a colored glass bottle by forming a resin coating layer on a glass bottle and then coloring the resin coating layer by dyeing.

According to the method for producing a colored glass bottle according to the present invention, after forming a resin coating layer on the glass bottle,
Since the coloring is performed by dyeing the coating layer, the coloring is performed at a substantially uniform depth from the surface of the coating layer. Therefore, even if the thickness of the resin coating layer formed on the glass bottle is uneven,
The resin coating layer obtains uniform coloring without affecting color unevenness, and a good colored bottle without color unevenness can be obtained.

In the method for producing a colored glass bottle according to the present invention, the resin coating layer formed on the glass bottle is subjected to a preliminary heat-curing treatment at a temperature lower than the standard heat-curing temperature, then dyed, and then heated at the standard heat-curing temperature. In the case where the curing treatment is performed, the dyeing molecules can diffuse into the resin coating layer and perform good dyeing.

Further, in the method for producing a colored glass bottle according to the present invention, in which the surface of the glass bottle is roughened by sandblasting or the like and then the resin coating layer is applied, the adhesion between the resin coating layer formed on the glass bottle and the glass bottle is improved. As a result, the life of the colored bottle can be extended.

In the method for producing a colored glass bottle according to the present invention, the surface of the glass bottle is coated with a primer obtained by diluting a silane coupling agent with a solvent, and then the melamine resin baking coating is performed. The adhesion of the coating layer is improved, and the useful life of the colored glass bottle can be extended.

Further, in the method for producing a colored glass bottle according to the present invention, in the case where the resin coating layer formed on the glass bottle is dyed and then the protective coating layer is formed on the dyed coating layer, deterioration of the colored layer Can be prevented, and the life of the colored glass bottle can be extended.

In the recycling step, the colored glass bottle according to the present invention can be reused without removing the coating layer only by a heat treatment without requiring a special sorting operation.

[Brief description of the drawings]

FIGS. 1A and 1B are cross-sectional views showing a configuration of a colored glass bottle according to a first embodiment of the present invention, wherein FIG.
It is an expanded sectional view of a part.

FIG. 2 is a graph showing the effect of the temperature of the preheating curing treatment on the resin coating layer and the time of immersion in the dyeing solution on the dyeing effect.

3A and 3B are cross-sectional views illustrating a configuration of a colored glass bottle according to a fifth embodiment of the present invention, where FIG. 3A is a longitudinal cross-sectional view, and FIG.
It is an expanded sectional view of a part.

FIG. 4 is a longitudinal sectional view showing the configuration of a conventional colored glass bottle.

FIG. 5 is a longitudinal sectional view showing the configuration of another conventional colored glass bottle.

[Explanation of symbols]

 2 Glass bottle 4 Resin coating layer 5 Dye penetration layer 6 Protective layer

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Koji Konishi 1-1-1 Kotobukicho, Mihara-shi, Hiroshima F-term (reference) in Ritsuju Mihara Engineering Co., Ltd. 3E033 AA02 BA01 BA13 DB01 DD05 EA09 EA10 EA12 3E062 AA09 AC06 AC07 DA01 JA04 JA05 JA08 JB04 JB22 JC02 JD10 4G059 AA04 AC08 FA07 GA01 GA04 GA16

Claims (8)

[Claims] 1. A method for producing a colored glass bottle, comprising: forming a resin coating layer on a glass bottle; and coloring the resin coating layer by dyeing the resin coating layer. 2. After forming the resin coating layer, the resin coating layer is subjected to a preliminary heat curing treatment at a temperature lower than a standard heat curing temperature, then dyed, and then subjected to a standard heat curing treatment. The method for producing a colored glass bottle according to claim 1, wherein: 3. The resin coating layer is formed of a thermosetting acrylic resin clear, and the preliminary heating and curing treatment is carried out by 60%.
3. The method for producing a colored glass bottle according to claim 2, wherein the method is carried out at a temperature of from 140 to 140C. 4. The method for producing a colored glass bottle according to claim 2, wherein the resin coating layer is formed by melamine resin baking coating, and the preliminary heat curing treatment is performed at a temperature of 50 to 120 ° C. 5. The method for producing a colored glass bottle according to claim 1, wherein the resin coating layer is formed after roughening the surface of the glass bottle. 6. The method for producing a colored glass bottle according to claim 4, wherein the surface of the glass bottle is coated with a primer obtained by diluting a silane coupling agent with a solvent, and then the melamine resin baking coating is performed. 7. The method for producing a colored glass bottle according to claim 1, wherein after dyeing the resin coating layer, a protective coating layer is formed on the dyed coating layer. . 8. A colored glass bottle having a dyed resin coating layer formed by the method according to claim 1.