JPS63129038A - Production of bottle for shielding ultraviolet rays - Google Patents

Abstract

PURPOSE:To produce an inexpensive bottle useful for shielding ultraviolet rays from bottles for cosmetics, medicines, etc., and to impart superior characteristics of the surface and strength to the bottles permitting desired decorating work by forming coating film on the surface of the glass bottle by applying a specified paint. CONSTITUTION:A paint contg. an ultraviolet rays absorber is obtd. by adding to a thermosetting paint (e.g. 'GLC CLEAR ZR(R)': acrylic paint) or a two liquid reaction type paint, 0.5wt% basing on the solid matter content of said paint ultraviolet rays-absorbing agent (e.g. 'TINUVIN 900(R)' dissolved in xy lene, etc.) having high compatibility with the above described paint and small volatility at <=250 deg.C, adding, if necessary, an adhesion increasing agent, etc., then admixing a solvent such as toluene, and mixing the whole components. Then, the obtd. paint is coated on the surface of the glass bottle to 5-50mu coating film thickness after heat curing with a hand spray, etc. Finally, the glass bottle is heated at ca. 180 deg.C for 20min in a hot drying furnace, etc., to cure the paint by heating.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Field of Industrial Application) This invention relates to a method for manufacturing a bottle that blocks ultraviolet rays, and is mainly used to protect the contents of cosmetics, pharmaceuticals, etc. that are easily deteriorated by ultraviolet rays. This invention relates to a method for producing an ultraviolet ray blocking bottle, which is used as a container and can be easily formed with excellent surface physical properties and strength, and can be freely decorated without being affected by color tone or transparency.

(Prior Art) Bottles that block ultraviolet rays, which are conventionally used as containers for cosmetics, medicines, etc., are mainly manufactured using the following three methods.

That is, the first method is to incorporate metal oxides or metal sulfides such as cerium, chromium, and selenium into molten glass, and then mold the glass into a bottle.

The second method is to simply apply an inorganic or resin paint mixed with a matting material and a coloring material to the surface of the glass bottle, and then provide a coating that blocks ultraviolet rays on the surface of the plate.

The third method is the method proposed in JP-A-61-186249, etc., in which ultraviolet absorbers, matting agents, colorants, etc. are mixed into electron beam curing or ultraviolet curing resin coatings. This is a method in which the paint is applied to the surface of the glass bottle and then irradiated with electron beams or ultraviolet rays to solidify it, thereby providing a coating that blocks ultraviolet rays.

(Problem to be solved by the invention) <Problems with conventional technology> However, the above method has the following problems.

Although the first and second methods can easily form a glass bottle that blocks ultraviolet rays, the finished glass bottle
Due to the ingredients and additives involved, only certain colors such as black, dark brown, or dark purple, or a matte finish can be produced, so there are limits to how glass bottles can be decorated, and it is inevitable that they will be fashionable or fashionable. The problem was that the product lacked appeal.

In other words, when metal oxides, sulfides, etc., which have an ultraviolet absorption effect are added to the glass components, the ultraviolet absorption effect may be affected due to temperature variations or unstable elements in the melting atmosphere since the glass is melted at around 1500°C. Decrease. Therefore, in order to obtain a sufficient ultraviolet absorption effect, it is necessary to increase the amount of the metal oxide, sulfide, etc. added. As a result, the color shown above is obtained. Also, in order to block ultraviolet rays by simply applying an inorganic acid or resin paint mixed with a matting material and a coloring material, as in the second method, it is necessary to use a dark color to block all light rays. Must not be. Furthermore, even if an ultraviolet absorber is added to the coating material, the compatibility is poor and it is not uniformly dispersed, or the ultraviolet absorber decomposes and evaporates, making it difficult to obtain a sufficient ultraviolet absorption effect.

Further, in the third method, transparency is lost because a photoconductive substance, an inorganic fluorescent substance, etc. are used. Moreover, many of the bottles used for cosmetics of this type have special designs and are mostly modified versions.On the other hand, in order to cure electron beam-curing or ultraviolet-curing paints, short-wavelength ultraviolet rays and electron beams are required to cure them. Since it is necessary to irradiate the irradiation line, different irradiation points occur on the same surface, such as in the case of a deformed glass bottle with uneven surfaces. Therefore, it was difficult to obtain a uniform cured state over the entire surface, and sufficient strength of the coating film could not be obtained, which adversely affected the strength of the glass bottle surface.

Technical Problem> Therefore, in view of the above-mentioned problems, the present invention has developed a bottle that blocks ultraviolet rays and is used as a container for contents that are easily deteriorated by ultraviolet rays, such as cosmetics and pharmaceuticals, and which has excellent surface physical strength and color tone. It was created with the aim of making it easy to form decorations that are not influenced by color or transparency.

[Structure 1 of the Invention (Means for Solving Problems) This invention provides a thermosetting or two-component reaction type paint that has excellent compatibility with the paint and is volatile at temperatures below 250°C. By adding 0.5% or more of an ultraviolet absorber to the solid component in the paint, and applying this paint to the surface of the glass bottle so that the film thickness range is 5 to 50μ. The above-mentioned problems are solved.

(Function) The method for manufacturing a bottle that blocks ultraviolet rays according to the present invention is to add an ultraviolet absorber to a thermosetting or two-component paint that has excellent compatibility with the paint and has low volatility at temperatures below 250°C. is added in an amount of 0.5% or more based on the solid components in the paint, so that the paint itself can absorb and block ultraviolet rays, and has the property of an ultraviolet absorber that has good compatibility with the paint. This UV absorber is used to uniformly disperse the UV absorber.

Then, apply this paint to the surface of the glass bottle in a coating thickness range of 5 to 5.
It is possible to coat glass bottles in a transparent state or for other decorations by applying the coating to a level of 0μ.
Cures the paint uniformly to maintain a constant coating thickness.

(Example) This invention will be explained in detail below.

1st Example: GLC Clear Z, a thermosetting acrylic paint, was used as a paint.
R (EC Chemical Co., Ltd.) flooQ, 30Q a solvent containing 3g of Tinupin 900 (manufactured by Ciba-Geigi) as an ultraviolet absorber (xylene was used as the solvent in this case), and a silane coupling agent as an adhesion enhancer. Mix everything using 3 g of A-1100 (manufactured by Japan Unicar Co., Ltd.), 30 g of toluene as a solvent, 40 g of methyl ethyl ketone (1), respectively.

In this case, since the ultraviolet absorber is difficult to dissolve and disperse, it is completely dissolved in xylene, which is an organic solvent, and then mixed into the paint. By doing so, the ultraviolet absorber can be uniformly dispersed within the paint and can be prevented from volatilizing. Additionally, the proportion of the ultraviolet absorber contained in the paint relative to the solid components of the paint must be at least 0.5%, but it is less than 1%.
~10% is preferred, in this example 3%.

The paint formed in this way was heated to an air pressure of 3.0
cd, diameter 1.54 μm, and sprayed onto a transparent glass bottle using a hand spray so that the coating thickness after heat curing would be approximately 50 μm.Then, the glass bottle was placed in a heat drying oven and heated at a temperature of 180°C. The paint was cured for 20 minutes.

As a result, it was possible to block more than 99% of ultraviolet rays with a wavelength of 370 nm or less without impairing the transparency of the glass bottle.

In addition, the formed coating film is alcohol resistant (10%, 37℃
), salt water resistance (10%, 37℃), artificial sweat resistance (37℃),
When we conducted a wrapping test for water resistance (tap water at 37°C), no abnormality occurred in the coating film even after 3 days.

In addition, we conducted adhesive tape peel tests, cross-cut tests, scale tests, etc., and good results in terms of strength were obtained in all tests.

Furthermore, even if the thickness of the coating film is 30 μm, the transparency of the glass bottle will not be impaired and ultraviolet rays with a wavelength of 370 nm or less will be blocked by 9 μm, as described above.
We were able to block more than 9%.

Second Example The various tests described above were conducted under the same conditions as in the first example, with the coating thickness being approximately 5μ after heat curing. Although it is slightly inferior in comparison, we were able to ensure sufficient strength that there is no problem in using it.

Furthermore, regarding the ultraviolet blocking effect, although the blocking rate was slightly lowered to 95%, a somewhat satisfactory result was obtained.

3rd Example - As a paint, 50g each of 5S25 medium epoxy resin (manufactured by Toyo Ink Mfg. Co., Ltd.), which is a two-component reactive paint, and 50g of 5825 curing agent (manufactured by Toyo Ink Mfg. Co., Ltd.); -As an ultraviolet absorber. 54 g of a solvent containing 5.4 g of Tinuvin 900 (manufactured by Ciba Geigi) (xylene was used as the solvent in this case), ・As an adhesion enhancer, silane coupling agent A-187 (Nippon Unicar Co., Ltd. tl.
) and 50Q of toluene and 50g of methyl ethyl ketone as solvents, respectively, and mix everything.

In that case, the mixing conditions are the same as in the first and second embodiments described above.

Then, in the same way as in the first example, the paint was sprayed to a coating thickness of about 30μ, and then the glass bottle was placed in a heat drying oven and the paint was cured at a temperature of 150°C for 20 minutes. I let it happen. In this case, it goes without saying that even if it is not heated, if it is left at room temperature for 24 hours, a coating film that can withstand use can be obtained.

As a result, it was possible to block more than 99% of ultraviolet rays with a wavelength of 370 nm or less without impairing the transparency of the glass bottle.

Incidentally, Tinuvin 900, the ultraviolet absorber used in each of the above Examples, was 2-[2-hydroxy-3,5-di(2,2
-dimethylbenzine)-phenyl]-2H benzotriazole, which is a benzotriazole-based ultraviolet absorber, and has low volatility at about 200°C.

Fourth Example As ultraviolet absorbers, 2(2°-hydroxy 3°15°-di-t-amylphenyl)benzotriazole (Biosorb 591 manufactured by Kyodo Yakuhin Co., Ltd.), 2(3, 5-di-t-butyl-
2-hydroxyphenyl)-5-chlorobenzotriazole (Tinuvin 327 manufactured by Ciba Geigi), 2-(5-
Even if a benzotriazole-based ultraviolet absorber such as methyl-2-hydroxyphenyl)benzotriazole (Tinuvin P manufactured by Ciba Geigi Co., Ltd.) is used, the same effects as in the above-mentioned Examples can be obtained. The same effect can be obtained by using benzophenone-based, acrylate-based, or salicylate-based ultraviolet absorbers.

Examples of ultraviolet absorbers for each group include: - benzotriazole-based 2(2-hydroxy-5-methylphenyl)benzotriazole, substituted benzotriazoles other than the above-mentioned benzotriazole-based compounds, and substituted benzotriazole-benzophenone-based 2 -Hydroxy-4-methoxybenzophenone, 2゜2
°-dihydroxy-4-methoxybenzophenone, 2-
Hydroxy-4-octoxybenzophenone, 2゜4-
Dihydroxybenzophenone, resorcinol monobenzoate, acrylate type 2-ethylhexyl-2-cyano-3.3-diphenylacrylate, ethyl-2-cyano-3.3-diphenylacrylate, salicylate type phenylsalicylate, 4- Examples include t-butylphenyl salicylate, p-octylphenyl salicylate, and the like.

Although the paints used in each of the above examples were transparent paints, any other paint may be used as long as it is a thermosetting type or a two-component reaction type paint. Needless to say, it's a good thing.

[Effects of the Invention] The present invention configured as described above provides a thermosetting or two-component reaction type paint with an ultraviolet absorber that has excellent compatibility with the paint and has low volatility at temperatures below 250°C. is added in an amount of 0.5% or more based on the solid components in the paint, and the paint is cured by applying this paint to the surface of a glass bottle so that the coating thickness range is 5 to 50μ. In this case, there is no need for conventional electron beam or ultraviolet irradiation, and since it is a type that cures by heating or by mixing two liquids, it forms a uniform coating even on uneven glass bottles. becomes possible.

By adding an ultraviolet absorber to the solid component of the paint in an amount of 0.5% or more, this paint can be applied to the surface of the glass bottle to form a thick film, as shown in the example above. By applying the coating so that the range is 5 to 50μ, the wavelength can be reduced to 3.
It can block more than 95% of 70nll ultraviolet rays.

At the same time, if the paint is transparent, it will remain transparent, and if it is of any other color, its color will not change, so it blocks UV rays while allowing free decoration that is not influenced by color tone or transparency. Moreover, since the UV absorber is used, which has excellent compatibility with the paint and does not volatilize at temperatures below 250°C, the UV absorbent paint can be used even when heated at temperatures below 250°C. This enables uniform content without volatilization and dispersion within the interior.

As explained above, according to the present invention, a bottle that blocks ultraviolet rays and is used as a container for contents that are easily deteriorated by ultraviolet rays, such as cosmetics and pharmaceuticals, can be made into a bottle that has excellent physical strength on the surface and is not affected by color tone or transparency. It has various excellent effects, such as being able to easily form a bottle with its original decoration, and making it possible to form various types of bottles with fashion or product appeal at low cost.

Claims (1)

[Claims] 1. Add an ultraviolet absorber that has excellent compatibility with the paint and has low volatility at temperatures below 250°C to the thermosetting or two-component paint at a ratio of 0.0% to the solid components in the paint.
A method for producing a bottle that blocks ultraviolet rays, characterized in that the paint is added in an amount of 5% or more and is coated on the surface of a glass bottle so that the coating thickness ranges from 5 to 50μ.