JPH06329166A - Anticorrosive treatment of exposed iron-plate of crown cap on beverage bottle - Google Patents

Abstract

PURPOSE:To provide an anticorrosive treatment of the exposed iron plate of the crown cap in a beverage bottle which is safe in view of hygienic point and extremely excellent in the anticorrosive effect. CONSTITUTION:An exposed iron-plate face of crown cap of a beverage bottle is treated with an extremely pure and odorless paraffin solvent solution or isoparaffin solvent solution containing an oligoester or a polyester obtained by the reaction of glyceric fatty acid monoester used as an emulsifier of a food additive with saturated dicarboxylic acid used for a seasoning.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention caps a beverage container with an exposed iron surface of the end face of the crown, which is generated when stamping and molding a tin or a tin-free steel sheet on which a beverage container is painted and printed. The present invention relates to a method of treating an exposed iron surface of a beverage container crown, such as an exposed iron surface of a cap stopper flaw of a crown, which is caused by a tightening jig, with a treatment agent that is harmless to the human body.

[0002]

2. Description of the Related Art Conventionally, as a method for preventing rust on an exposed iron surface of a crown, a method of treating the crown with a phosphate and a vaporizable rust preventive (JP-A-48-626), zinc powder or aluminum powder is used. A method of treating a crown with a resin coating containing the same (JP-A-55)
-55947, JP-A-58-134867), and a method of treating a crown with an oxygen absorber (JP-A-60-131981).
Further, a method of treating a crown with an oily agent such as wax, petrolatum or paraffin (JP-A-51-90682) is disclosed.

[0003]

Conventionally, since the flat portion of the crown for containers for beer, soft drinks, etc. is printed, rust does not occur, but a paint-printed tin-free steel sheet or Since the crown is stamped and molded from the tin sheet, the end surface of the crown has an exposed iron surface. When the crown is capped into the beverage container, the coating may be partially peeled off due to the friction between the fastening member and the crown surface coating. As described above, the exposed iron surface at the contact portion between the crown end surface and the fastening member is likely to be rusted under high temperature and high humidity in the rainy season or dew condensation in the winter. In the summer, drink bottles such as beer, cider, juice and liquor may be placed directly in the cooler box to cool, so in such a case water directly attaches to the exposed iron surface of the crown and promotes rusting. As a result, the rusted crown significantly reduces the image of beverage products and affects the product value. However, when the above-mentioned part of the crown of the beverage container is rust-proofed, if it is treated with a conventional rust-preventive agent, there is a problem in safety for human body from the viewpoint of food hygiene. Particularly, the rust preventive agent applied to the exposed iron on the end surface after molding of the crown may cause powder produced by the rubbing of the crowns to adhere to the packing surface of the crown, which may be mixed into the beverage. In addition, an infant may accidentally put the extracted crown in his mouth and the rust preventive may be dissolved by saliva and swallowed. Therefore, the rust preventive agent used for the exposed iron surface of the beverage container crown is required to be highly safe for the human body. However, there are currently no rust preventives that meet this need.

[0004]

Means for Solving the Problems As a result of intensive research aimed at solving the above problems, the present inventors have used glycerin fatty acid monoesters currently used as emulsifiers for food additives and seasonings. We have found that oligoesters or polyesters obtained by reaction with succinic acid have excellent rust-preventive properties, and when a solution prepared by dissolving this in a high-purity odorless paraffin-based or isoparaffin-based solvent is punched out or when the crown is punched. The present invention has been completed by discovering that rust can be easily prevented by applying it to an exposed iron surface generated when plugging.

The present invention contains an oligo or polyester obtained by reacting the exposed iron surface of a beverage container crown with a glycerin fatty acid monoester used as an emulsifier in a food additive and a saturated dicarboxylic acid used as a seasoning. It is a rust-preventive treatment method with high safety for the human body, which is characterized by treatment with a high-purity odorless paraffinic or isoparaffinic solvent solution.

The object to be treated by the method of the present invention is a crown that is stamped and formed from a tin-free steel sheet, a tin sheet or the like, which is generally used for containers of beer, soft drinks and the like and has a flat portion printed. Therefore, the iron surface is exposed on the end surface of the crown by punching. Further, when the crown is capped in a beverage container, the coating film is peeled off due to friction between the fastening member and the crown surface coating film, and the iron surface is exposed.

The rust preventive composition used in the treatment method of the present invention is an oligo- or polyester of glycerin fatty acid monoester used as an emulsifier in food additives and a saturated dicarboxylic acid used as a seasoning. is there.
Examples of the glycerin fatty acid monoester include oleic acid monoglyceride, palmitic acid monoglyceride, stearic acid monoglyceride and the like. Examples of the saturated dicarboxylic acid used as a seasoning include succinic acid and its anhydride. When the glycerin fatty acid monoester is reacted with a dicarboxylic acid, the glycerin fatty acid monoester may be a glycerin ester of the same fatty acid or a different fatty acid. The diester synthesized by the reaction with dicarboxylic acid may be oligoester or polyester. This rust preventive compound is dissolved in a high-purity odorless paraffinic or isoparaffinic solvent to prepare a rust preventive composition for use in the present invention. In this case, one or more diester compounds obtained by the reaction of the glycerin fatty acid monoester and the dicarboxylic acid are contained.
The ester compound contained in the highly purified and highly pure odorless paraffinic or isoparaffinic solvent is 1 to 30% by weight, preferably 2 to 20% by weight.

A rust preventive agent composition for use in ordinary steel plate rust prevention, which does not particularly require safety to the human body, such as rust preventive treatment of exposed iron surface of a beverage container crown, includes a fatty acid monoglyceride A mineral spirit solution composition containing one or more kinds of esters obtained by using adipic acid or azelaic acid as the dibasic acid used in the reaction can be used.

The method of applying the rust-preventive composition harmless to the human body prepared as described above to the exposed iron surface of the crown for beverages to carry out the rust-prevention treatment is as follows: Appropriate processing means such as coating on the exposed iron surface by dipping the exposed iron surface of the crown, dipping the exposed iron portion of the crown in the rust preventive composition liquid, or spray coating can be employed.

The diester obtained by reacting the fatty acid monoglyceride with the dicarboxylic acid used in the present invention is produced by a conventional method. For example, stearic acid monoglyceride 272 parts by weight (1 mol), oleic acid monoglyceride 7
96 parts by weight (3 mol) and 228 parts by weight of succinic anhydride (3 mol) were placed in a 2-liter four-necked flask equipped with a stirring bar, a thermometer, a nitrogen blowing tube, and a suspension tube with a reflux tube, and xylene was used as a reflux solvent. 65 parts by weight and 1 part by weight of caustic soda as a catalyst were added, and the mixture was heated with stirring at 200 to 220 ° C. for 6 hours. After cooling, xylene is removed under reduced pressure at 120 ° C. and adsorption treatment with activated clay is performed to obtain the target ester having an acid value of 0.5.

Example 1 A crown stamped from a paint-printed tein-free steel sheet was continuously transferred by a belt conveyor, and during the transfer process, the rust preventive composition of the following composition was prepared. A cloth belt impregnated with a pure odorless paraffin liquid (anticorrosion treatment liquid) is installed, and is applied to the exposed iron surface of the end face of the formed crown while rotating the belt.

Example 2 In order to evaluate the rusting property on the exposed iron surface of the end face of the crown when the beverage bottle was stoppered and the exposed iron surface caused by peeling of the printed coating film by the stoppering machine, the beverage bottle was stoppered. Without using a wooden rod with the same thickness as the diameter of the bottle to cap the crown, the exposed iron surface of the crown molded with a stoppering machine was filled in a petri dish to a depth of 5 mm and the protection shown in Table 1 below was applied. It was immersed in a rust treatment liquid.

[0013]

[Table 1]

Test Example The anticorrosion properties of the crowns treated in the above Examples 1 and 2 were put in a thermo-hygrostat (60 ° C./RH 95%), and the generation of rust at the crown edge was observed with the passage of time to prevent corrosion. The effect was evaluated and the results are shown in Table 2.

[0015]

[Table 2]

As is clear from the above results, the crown treated by the rustproofing method of the present invention remarkably suppressed the generation of rust.

[0017]

INDUSTRIAL APPLICABILITY The rust preventive treatment method for the crown of the present invention is a method which uses a rust preventive treatment composition containing components safe for humans from the viewpoint of food hygiene and has an extremely excellent rust preventive effect.

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[Procedure amendment]

[Submission date] January 12, 1994

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The rust preventive composition used in the method of the present invention is
It is an oligoester or polyester of glycerin fatty acid monoester used as an emulsifier in food additives and saturated dicarboxylic acid used as a seasoning. As the glycerin fatty acid monoester, lignoceric acid monoglyceride, erucic acid monoglyceride, behenic acid monoglyceride, linoleic acid monoglyceride, eicosenoic acid monoglyceride, linolenic acid monoglyceride, oleic acid monoglyceride, stearic acid monoglyceride, palmitic acid monoglyceride, which are the components contained in edible vegetable oils. , Myristic acid monoglyceride, lauric acid monoglyceride, capric acid monoglyceride, caprylic acid monoglyceride and the like. As specific edible vegetable oils, safflower oil, corn oil,
The above fatty acids obtained from soybean oil, sunflower oil, cottonseed oil, rice oil, olive oil and other edible oils can be used. Examples of the saturated dicarboxylic acid used as a seasoning include succinic acid and its anhydride. When the glycerin fatty acid monoester is reacted with a dicarboxylic acid, the glycerin fatty acid monoester may be a glycerin ester of the same fatty acid or a different fatty acid. The diester synthesized by the reaction with dicarboxylic acid may be either an oligoester or a polyester, but oligoester is more preferable in view of solubility in a solvent. The synthetic ester having rust preventive property is dissolved in a high-purity odorless paraffinic or isoparaffinic solvent to prepare a rust preventive composition for use in the present invention. In this case, one or more diester compounds obtained by the reaction of the glycerin fatty acid monoester and the dicarboxylic acid are contained. And
The ester compound contained in the highly purified odorless paraffinic or isoparaffinic solvent having a high purity is 1 to 30.
%, Preferably 2 to 20% by weight.

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[0013]

[Table 1]

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Test Example Evaluation of the rust preventive property of the crown treated in Examples 1 and 2 was as follows.
Using a constant temperature and constant humidity chamber (60 ° C / RH 95%), the effect was confirmed by observing the rust generated on the crown edge portion over time. The results are shown in Table 2.

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[0015]

[Table 2]

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Keiichi Tanigawa 1-2-1,400 Umeda, Kita-ku, Osaka City, Osaka Prefecture Daido Chemical Industry Co., Ltd. (72) Inventor Katsuaki Endo 1 Umeda, Kita-ku, Osaka City, Osaka Prefecture 2-2-1400, Daido Chemical Industry Co., Ltd.

Claims (3)

[Claims] 1. An oligoester or polyester obtained by reacting the exposed iron surface of a beverage container crown with a glycerin fatty acid monoester used as an emulsifier in a food additive and a saturated dicarboxylic acid used as a seasoning. A method for rust-preventing an exposed iron surface of a beverage container crown, which is characterized by performing rust-prevention treatment with a highly pure odorless paraffinic or isoparaffinic solvent solution. 2. The rust preventive method according to claim 1, wherein the glycerin fatty acid monoester is a glycerin monoester of oleic acid, palmitic acid or stearic acid. 3. The rust preventive method according to claim 1, wherein the saturated dicarboxylic acid is succinic acid or succinic anhydride.