JPH06330339A - Al container and production therefor - Google Patents

Abstract

PURPOSE:To provide an Al container having excellent lubricity in a preceding stage where a chemical conversion treatment with a phosphoric acid-zirconium aqueous solution was performed and the outside was printed, and the production method therefor. CONSTITUTION:A chemical conversion coating film is provided by treating the surface of the Al container formed of an Al plate with the phosphoric acid-zirconium aqueous solution. The Al container is stuck with an N,N- dipolyoxyalkylene-alkylamine type cation surfactant on the chemical conversion coating film. The Al plate is stamped out into a cup form with a bottom, and is subjected to deep draw working to form the Al container. Subsequently, the Al container is defatted and washed with water, and the surface is treated with the phosphoric acid-zirconium aqueous solution to form the chemical conversion coating film. Besides, the chemical conversion coating film is treated with the prescribed surfactant. The Al container treated with the surfactant is washed with water, and dried to form the Al container stuck with the surfactant and the chemical conversion coating film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum container formed by punching an aluminum plate into a cup shape having a bottom, squeezing and ironing, and a method for manufacturing the same.

[0002]

2. Description of the Related Art Aluminum DI conventionally used for beverage cans, etc.
The can is made by punching an aluminum plate into a cup with a bottom,
The opening end is squeezed to form a can body, and then the oil content on the inside and outside of the can attached in the processing step is degreased, washed with water and subjected to a chemical conversion treatment, and then washed with water, dried, and printed on the outside surface. It is manufactured by applying internal coating. In the above-mentioned manufacturing method, after the chemical conversion treatment, the washed and dried can body is placed in an upright state on a conveying path composed of a conveying belt and the like, and a part of the conveying path is conveyed in a printing step for performing outer surface printing. Has a section where the cans are aligned and conveyed in a line. However, the chemical conversion-treated can body has a large coefficient of dynamic friction on the surface of the can body before the outer surface is printed. As described above, the can bodies in the upright state collide with each other when aligned in a line as described above. When they come into contact with each other, it becomes difficult to separate them, and there is a problem that it is difficult to smoothly arrange the assembled can bodies and supply them to the section to be conveyed in a single line.

When printing is performed on the outer surface of the can body, a holding mandrel must be inserted into the inner surface of the can body to hold the can body from the inner surface side. If the dynamic friction coefficient is large, there is a problem that the holding mandrel cannot be smoothly taken in and out.

In order to solve the above problems, various means have been proposed for improving the slipperiness of the surface of a can body that has been subjected to a chemical conversion treatment before the outer surface printing. For example, in Japanese Patent Laid-Open No. 4-66671,
A surface treatment liquid for aluminum and aluminum alloys containing a phosphate ion, a condensed phosphate ion and a water-soluble resin is disclosed.

According to the description of the above-mentioned publication, an aluminum plate is punched into a cup shape having a bottom, and the opening end thereof is squeezed and ironed to form a can body, and the oil content on the inner and outer surfaces of the can adhered in the processing step is removed. After degreasing and washing with water, the surface treatment liquid is applied to obtain a chemical conversion coating excellent in corrosion resistance and paint adhesion. Further, according to this chemical conversion coating, the can body is formed before external printing. Is said to improve the slipperiness.

However, the chemical conversion coating formed by the surface treatment liquid is an organic-inorganic composite coating containing phosphate and resin as main components, and the metal surface is formed by direct reaction with the resin. Therefore, the surface treatment liquid is phosphoric acid-
It is inconvenient that it is difficult to apply to an aluminum container that has been subjected to chemical conversion treatment with a zirconium aqueous solution or the like.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an aluminum container having excellent slipperiness in a stage before chemical conversion treatment with an aqueous solution of phosphoric acid-zirconium and external printing, and a method for producing the same. And

[0008]

In order to achieve the above object, the aluminum container of the present invention is an aluminum container formed by punching an aluminum plate into a cup shape having a bottom and squeezing and ironing. A chemical conversion coating is provided by treating the surface with an aqueous solution of phosphoric acid-zirconium, and an N, N-dipolyoxyalkylene-alkylamine-based cationic surfactant is further adhered to the chemical conversion coating.

The aluminum container of the present invention comprises a step of forming an aluminum container by punching an aluminum plate into a cup shape having a bottom, squeezing and ironing to form an aluminum container, and degreasing and washing the aluminum container with the surface thereof. A chemical conversion film forming step of forming a chemical conversion film by treating with a phosphoric acid-zirconium aqueous solution and a surface of the aluminum container on which the chemical conversion film is formed are treated with an N, N-dipolyoxyalkylene-alkylamine-based cationic surfactant. It can be advantageously manufactured by a method of manufacturing an aluminum container having a surfactant treatment step of treating.

In the production method of the present invention, when the surface treatment is performed with the surfactant before the chemical conversion treatment step, the aluminum container to which the surfactant is attached easily repels the phosphoric acid-zirconium aqueous solution, and a uniform chemical conversion treatment is performed. It is not possible to obtain an aluminum container having excellent corrosion resistance. Therefore, the treatment with the surfactant needs to be performed after the chemical conversion treatment step.

The treatment with the surfactant is carried out by spraying the solution of the surfactant onto the inner and outer surfaces of the aluminum container which has been subjected to the chemical conversion treatment at a proper temperature for a proper time, or in the solution of the surfactant described above. It is carried out by immersing the aluminum container which has been subjected to the chemical conversion treatment, and then washing with water and drying.

When the aluminum container treated with the surfactant is not washed with water and is transferred to a subsequent step, the aluminum container itself has excellent slipperiness and a plurality of aluminum containers are provided in a section to be transferred in a line. Supplied at once,
Although it is possible to solve the problem that the holding mandrel is not smoothly taken in and out when performing outer surface printing, since the surfactant is attached more than necessary to the aluminum container, an excessive amount of the surfactant is used as a conveyance path. There is a problem that it adheres to and contaminates the conveyor. Further, a heating means such as an oven for heating the aluminum container is provided in the middle of the transport path, and when the conveyor contaminated with the surfactant passes through the oven, the surfactant is firmly attached to the conveyor. It adheres to and cannot be dropped.

The surfactant is 130 to 350 ppm.
It is preferable to use a solution having a concentration in the range. Thirteen
If it is less than 0 ppm, the effect of improving the slipperiness may not be sufficiently obtained. Further, if it exceeds 350 ppm, the foamability of the surfactant solution becomes high, so that process control becomes difficult, or the excess surfactant cannot be sufficiently removed even by washing with water after the surfactant treatment process. Sometimes.

Preferable examples of the above-mentioned surfactant include N, N-dipolyoxyethylene-alkylamine represented by the following chemical formula 1 or a chloride compound represented by the following chemical formula 2.
Mention may be made of primary ammonium salts.

[0015]

[Chemical 1]

R 1 in the chemical formula ₁ is an alkyl group having 16 to 18 carbon atoms, and n + m is 3 to 7.

[0017]

[Chemical 2]

R ₂ and R _{3 in} Chemical formula 2 are an alkyl group, an allyl group or an alkylallyl group, and specific examples thereof include a benzyl group. n + m is 3 to 7.

When the surfactant is used as the ammonium salt, the solubility and dispersibility of the surfactant in the aqueous solution are improved, and the surfactant reacts with the chemical conversion film to easily and uniformly adhere.

The surfactant may be used alone as an aqueous solution. However, when external surface printing is performed on the aluminum container treated with the aqueous surfactant solution with a water-soluble paint, the water-based paint is repelled to prevent coating failure. It may happen, so
It is preferably used in a state of being dissolved in a phosphoric acid-zirconium aqueous solution. In use, a small amount of antifoaming agent may be used if desired. By dissolving the surfactant in the phosphoric acid-zirconium aqueous solution, the coating failure with respect to the adhered surfactant is prevented and the paint adhesion is improved.

When the surfactant is used by dissolving it in the phosphoric acid-zirconium phosphate aqueous solution, the chemical conversion treatment reaction with the solvent of the phosphoric acid-zirconium phosphate aqueous solution simultaneously proceeds, and the chemical conversion film formed at this time is the chemical conversion film. a total amount of the chemical conversion film formed by forming process, is preferably in the range of 5 to 25 mg / m ² in terms of the amount of deposition of zirconium, and more preferably 20 mg / m ² or less. When the amount of zirconium adhered exceeds the above amount, the adhesion of the paint to the adhering surfactant decreases, and the paint may peel during the can processing step.

When the surfactant is used by dissolving it in the phosphoric acid-zirconium aqueous solution, the treatment with the surfactant is preferably carried out for a time in the range of 5 to 25 seconds. If the time required for the treatment is less than 5 seconds, the effect of improving the slipperiness may not be sufficiently obtained, and if it exceeds 25 seconds, the amount of the surfactant adhering becomes too large, and even if it is washed with water, it is excessive. It may not be possible to completely remove the surfactant,
In addition, the amount of zirconium attached to the conversion coating formed at the same time increases.

When the surfactant is used by dissolving it in the phosphoric acid-zirconium aqueous solution, the liquid temperature of the phosphoric acid-zirconium aqueous solution in which the surfactant is dissolved is in the range of 30 to 50 ° C. It is preferable.
If the liquid temperature is lower than 30 ° C, the effect of improving the slipperiness may not be sufficiently obtained, and if the liquid temperature exceeds 50 ° C, the phosphoric acid-
The chemical conversion treatment reaction with the zirconium aqueous solution progresses, and the amount of zirconium attached to the chemical conversion coating formed simultaneously with the surfactant treatment increases.

[0024]

According to the aluminum container of the present invention, a conversion coating is provided by treating the surface of the aluminum container with an aqueous solution of phosphoric acid-zirconium, and further a N, N-dipolyoxyalkylene-alkylamine-based cationic surfactant. The surface-active agent is adhered to the surface by treatment with, so that the surface-active agent reduces the dynamic friction coefficient and imparts excellent slipperiness.

According to the preferred method for producing an aluminum container of the present invention, first, an aluminum plate is punched out into a cup shape having a bottom, squeezed and ironed to form an aluminum container, which is degreased and washed with water, and then the surface thereof is rinsed with phosphorus. By chemical conversion treatment with an acid-zirconium aqueous solution, a chemical conversion film containing zirconium phosphate as a main component is formed on the surface thereof.

Next, the surface of the aluminum container on which the chemical conversion coating has been formed is dissolved in the zirconium phosphate treatment liquid to prepare an aqueous solution in which a predetermined amount of N, N-dipolyoxyalkylene-alkylamine-based cationic surfactant is dissolved. By spraying or dipping at a predetermined temperature for a predetermined time, followed by washing with water and drying, a proper amount of the surfactant firmly adheres to the chemical conversion coating.

As a result, it is possible to obtain an aluminum container in which the coefficient of kinetic friction is reduced by the surfactant and excellent slipperiness is imparted.

The surfactant is 130 to 350 ppm.
When used in a solution having a concentration within the range, a suitable amount of the surfactant for imparting lubricity to the aluminum container adheres to the conversion coating.

Since the surfactant is the quaternary ammonium salt of N, N-dipolyoxyalkylene-alkylamine, the ammonium salt reacts with the chemical conversion film, so that the surfactant is uniform and uniform. It adheres firmly and does not fall off in subsequent steps.

Since the above-mentioned surfactant is dissolved in the phosphoric acid-zirconium aqueous solution, coating defects with respect to the adhered surfactant are prevented and the coating adhesion is improved.

When the surfactant is dissolved in an aqueous solution of phosphoric acid-zirconium and used, a chemical conversion reaction with the aqueous solution of phosphoric acid-zirconium in the solvent proceeds simultaneously with the treatment with the surface active agent. The total amount of the chemical conversion coating and the chemical conversion coating formed in the chemical conversion coating forming step is 5 to 2 in terms of the amount of zirconium deposited.
By setting the range to 5 mg / m ² , excellent corrosion resistance,
Provides slipperiness and paint adhesion.

When the surfactant is used by dissolving it in an aqueous solution of phosphoric acid-zirconium, the treatment with the surfactant is carried out for a time in the range of 5 to 25 seconds so as to impart slipperiness to the aluminum container. A suitable amount of the surfactant is applied to the conversion coating.

When the surfactant is used by dissolving it in an aqueous solution of phosphoric acid-zirconium, the liquid temperature is set to 3
By setting the temperature in the range of 0 to 50 ° C., a suitable amount of the surfactant for imparting slipperiness to the aluminum container is attached to the conversion coating.

[0034]

EXAMPLE Next, a method for manufacturing the aluminum DI can 1 of this example will be described.

First, an aluminum plate, which is a raw material, is punched into a cup shape having a bottom and drawn and ironed according to a conventional method to form an aluminum can body.

Oil is attached to the surface of the aluminum can during the step of forming the aluminum plate. Therefore, by degreasing and washing with water according to the usual method,
Remove the oil adhering to the aluminum can.

Next, an aqueous solution of zirconium phosphate-spray is sprayed on the inner and outer surfaces of the degreased aluminum can body at 35 ° C. for 20 seconds. The phosphoric acid-zirconium aqueous solution contains components of 50 ppm in terms of phosphoric acid and 50 ppm in terms of zirconium. By the spraying treatment, a chemical conversion film containing zirconium phosphate as a main component is formed on the inner and outer surfaces of the aluminum can body.

Next, a surface active agent solution is spray-treated at 35 ° C. for 20 seconds on the inner and outer surfaces of the aluminum can body having the chemical conversion coating formed thereon.

In this example, N, N was used as the surfactant.
-N, N-dipolyoxyethylene-stearyl-obtained by reacting dipolyoxyethylene-stearylamine (n + m = 5 in Chemical formula 1) with benzyl chloride
A surfactant containing benzylammonium salt as a main component is used by dissolving it in an aqueous solution of zirconium phosphate at a concentration of 130 to 350 ppm. As the phosphoric acid-zirconium aqueous solution in which the surfactant is dissolved, the same one as that used for forming the chemical conversion film is used.

By the spraying treatment, N, N-dipolyoxyethylene-stearyl-benzylammonium salt was firmly adhered to the inner and outer surfaces of the aluminum can body together with the chemical conversion film. N, N-dipolyoxyethylene-stearyl-benzylammonium salt which is not attached to the surface is also attached to the surface at the same time.
In such a state, when the aluminum DI can is transported to the subsequent step, it causes contamination of the transport path, so that the aluminum can body coated with the surfactant is washed with water,
Remove excess surfactant.

Then, by drying the washed aluminum can body, a surfactant made of N, N-dipolyoxyethylene-stearyl-benzylammonium salt is deposited on the conversion coating film to form an aluminum DI can. obtain.

Next, the concentration of the surfactant is adjusted to 0 to 500.
The state of the surfactant solution, the coefficient of kinetic friction of the surface of the aluminum DI can 1, the slipperiness, when the amount was varied in the range of ppm,
The wettability with water was evaluated as an index of the adhesiveness of the water-based paint. The evaluation results are shown in Table 1.

[0043]

[Table 1]

From Table 1, the concentration of the surfactant was 130.
When it is less than ppm, the slipperiness is low, and when it is more than 400 ppm, the surfactant solution foams and is difficult to process.
Further, it is clear that the surface of the obtained aluminum DI can 1 has low wettability with water. Therefore, it is suitable to use the surfactant at a concentration of 130 to 350 ppm.

[0045]

As is clear from the above, according to the aluminum container of the present invention, the coefficient of kinetic friction is reduced by the surfactant attached on the chemical conversion coating, and excellent slidability is imparted. Therefore, when a large number of cans are conveyed to the subsequent process, and in a section where they are gradually arranged in a line and conveyed, the cans move smoothly, aluminum containers collide with each other, and bridges and other problems can be avoided. .
Further, the holding mandrel can be smoothly taken in and out when the outer surface is printed.

Further, according to the method for producing an aluminum container of the present invention, the chemical conversion coating obtained by treatment with the phosphoric acid-zirconium aqueous solution is further treated with the N, N-dipolyoxyalkylene-alkylamine-based cationic surfactant. Then, by strongly adhering the surfactant to the chemical conversion coating, it is possible to obtain an aluminum container having a reduced dynamic friction coefficient and excellent slidability.

The surfactant is 130 to 350 ppm.
When used in a solution having a concentration within the range, a suitable amount of the surfactant for imparting lubricity to the aluminum container can be attached to the conversion coating.

In the method for producing an aluminum container of the present invention, by using the quaternary ammonium salt of N, N-dipolyoxyalkylene-alkylamine as the surfactant, the surfactant is uniformly dispersed in the aqueous solution. It dissolves and disperses, adheres uniformly and firmly to the chemical conversion film, and does not fall off in a later step.

Since the above-mentioned surfactant is dissolved in an aqueous solution of phosphoric acid-zirconium, it is possible to prevent coating failure with respect to the adhering surfactant, and to obtain excellent paint adhesion.

When the above-mentioned surfactant is dissolved in an aqueous solution of phosphoric acid-zirconium and used, the conversion coating formed simultaneously with the treatment with the surfactant is converted to the amount of zirconium to be in the range of 5 to 25 mg / m ² . With this, excellent paint adhesion can be obtained.

When the surfactant is used by dissolving it in an aqueous solution of phosphoric acid-zirconium, the treatment with the surfactant is performed for a time in the range of 5 to 25 seconds so as to impart slipperiness to the aluminum container. A suitable amount of the surfactant can be applied to the conversion coating.

When the surfactant is used by dissolving it in an aqueous solution of phosphoric acid-zirconium, the temperature of the solution is 3
By setting the temperature in the range of 0 to 50 ° C., a suitable amount of the surfactant for imparting lubricity to the aluminum container can be attached to the conversion coating.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical indication location B65D 1/12 (72) Inventor Munehisa Hattori 839-1 Kamuro, Iwatsuki-shi, Saitama Hokkai Seikan Co., Ltd. Inside the technical headquarters

Claims (8)

[Claims] 1. An aluminum container formed by punching an aluminum plate into a cup shape having a bottom, squeezing and ironing, to form a chemical conversion coating by treating the surface of the aluminum container with an aqueous solution of phosphoric acid-zirconium. An aluminum container characterized by further depositing an N, N-dipolyoxyalkylene-alkylamine-based cationic surfactant on the coating. 2. A container forming step of punching an aluminum plate into a cup shape having a bottom and squeezing and ironing to form an aluminum container; and degreasing and washing the aluminum container with water, and then its surface with a phosphoric acid-zirconium aqueous solution. A chemical conversion coating forming step of forming a chemical conversion coating by treatment, the surface of the aluminum container on which the chemical conversion coating is formed,
A surfactant treatment step of treating with an N, N-dipolyoxyalkylene-alkylamine-based cationic surfactant, and a method for producing an aluminum container. 3. The method for producing an aluminum container according to claim 2, wherein the surfactant is used in a solution having a concentration in the range of 130 to 350 ppm. 4. The method for producing an aluminum container according to claim 2, wherein the surfactant is a quaternary ammonium salt of N, N-dipolyoxyalkylene-alkylamine. 5. The method for producing an aluminum container according to claim 2, wherein the surfactant is dissolved in a phosphoric acid-zirconium aqueous solution. 6. Phosphoric acid in which the surfactant is dissolved
The conversion coating formed by the zirconium aqueous solution is the total amount of the conversion coating formed in the conversion coating forming step,
The method for producing an aluminum container according to claim 5, wherein the amount of zirconium is converted into the range of 5 to 25 mg / m ² . 7. The method according to claim 5, wherein the treatment with the surfactant is carried out for a time in the range of 5 to 25 seconds when the surfactant is dissolved in an aqueous solution of phosphoric acid-zirconium. Aluminum container manufacturing method. 8. The liquid temperature of the surfactant solution is in the range of 30 to 50 ° C. when the surfactant is dissolved in a phosphate-zirconium aqueous solution. Aluminum container manufacturing method.