JPS59225951A - Aluminum material for cap with coated foundation film - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an aluminum material for caps, and more particularly to an aluminum material applied to caps such as Tiyao 7 caps (T, O caps) and Pilfurplu 7 caps.

Conventionally, these caps have been manufactured by applying a size foot of 2 to 1 g/m@2 to a degreased aluminum material, and then applying a top coat and processing such as a pattern. In this case, the main purpose of the size coat is to increase the adhesion of the top coat and prevent it from peeling off due to processing, etc., and although sufficient performance can be obtained in terms of the adhesion of the paint film,
It is disadvantageous in terms of cost and productivity compared to chemical conversion treatment, etc.

In addition, as a cap coat, modified vinyl that can withstand severe forming processes such as drawing is generally used, and as a size coat, which is the base coating for the top coat, it is compatible with both aluminum materials and top foot paints and has excellent adhesion. Epoxy esters such as vinyl chloride-vinyl acetate or modified vinyl are used.

The coating method for cap coating is usually a wicket type in which each cut plate is coated one side at a time, and in the past, the process was complicated: size foot application → baking order 1 → top coat application → baking. , there is a problem in terms of productivity.

On the other hand, chemical conversion treatment is generally used to prevent corrosion of aluminum materials or as a base treatment for painting, and since it can be applied to coil forms and does not require baking, it is advantageous because it requires fewer steps. In this method, since the paint was baked on one side at a time, one side was skewered, and the chemical conversion coating did not provide sufficient adhesion of the coating, making it unsuitable as a base treatment method for caps.

In order to solve these problems and obtain an aluminum material for caps that can omit the size coat, the inventors of the present invention have conducted intensive research and have first strictly controlled the amount of chromium deposited on aluminum materials that have been subjected to phosphoric acid chromate treatment. We have developed an aluminum material for gaps that does not reduce the adhesion of coatings due to skewering and can omit size coating.

Although this phosphoric acid chromate-treated aluminum material for caps is extremely superior and allows the size coating to be omitted, it tends to be slightly less slippery than size-coated aluminum abrasives, and it does not provide much slipperiness. If a lubricant such as di-octyl sebacate is applied to the surface of the paper, there are problems such as slightly inferior ink adhesion in direct printing. Furthermore, the phosphoric acid chromate treatment liquid has the disadvantage that it is highly toxic to the human body, making it difficult to treat wastewater from the treatment liquid and to dispose of the sludge produced by the wastewater treatment.

In order to solve the various drawbacks and problems of conventional size-coated or phosphoric acid chromate-treated aluminum materials as explained below, and to obtain an aluminum material for caps having an excellent base coating film, the present inventor has developed various methods. As a result of the research, (1) the adhesion of the paint film is good and it is possible to omit the size coat.

(2) It is easy to process and does not require washing with water or baking after treatment.

(3) The treated aluminum material has good slip properties and corrosion resistance.

(4) Good ink adhesion even when printed directly on treated aluminum materials.

We have completed an aluminum material for camping that has a coating base film that satisfies the above requirements.

The present invention provides an aluminum material for a cap that can omit a size coat and has a coating base film that has good slip resistance, corrosion resistance, and good ink adhesion when directly printed.

The aluminum material for caps having a coating base film according to the present invention is characterized in that the amount of zirconium deposited is 0.5 mg/m2 or more as a base film for resin coating on an aluminum or aluminum alloy substrate. This is because a mixed coating of a zirconium compound and a polymer having a hydroxyl group or a carboxyl group is provided.

The aluminum material for a cap having a paint base film according to the present invention will be described in detail below.

Previously, representative norconium compounds are alkali metal salts and ammonium salts of ammonium zirconium carbonate and fluorozirconate,
It is water soluble.

Next, examples of polymers having water-soluble hydroxyl or carboxyl groups include polyacrylic acid, polyvinyl alcohol, cellulose hydroxyethyl ether, ethylene maleic anhydride, polyvinylpyrrolidine, and polyvinylmethyl ether, which can be used in dispersed particle form. Examples of the polymer include acrylic copolymer latex. Particularly preferred aqueous compositions are aqueous polyacrylic acids, including alkali metal and ammonium salts of polyacrylic acids, and emulsions or latexes of water-dispersible polyacrylic acid derivatives, such as polyacrylic esters. Essentially, however, it is also possible to use any polymer that is stable in the presence of a norconium compound in a water-based composition.

The amount of the polymer in the mixed film is preferably in the range of 1 to 3 parts per part of norconium, and the aluminum material obtained by contacting such a mixed composition with an aluminum material and drying. The film is insoluble in water and solvents, has excellent corrosion resistance and good paint adhesion, and is also stable against heat, so it will not have any adverse effects on the baking of the top coat in the next process. In addition, the ratio of the polymer and norconium in this film is approximately the same as the ratio of the mixed composition, and if the amount of the film on aluminum is 0.5 mg/m2 as the amount of zirconium, the required properties can be achieved. Satisfied, but preferably 2-50+ng/
+n2.

If the amount of zirconium deposited is less than 0.5 mg/m2, sufficient performance as an aluminum material for a cap cannot be obtained, and if the amount of deposited zirconium exceeds 50 mg/m2, the effect is saturated and it is useless.

The aluminum material used has the required properties such as workability and tearability of 61/61 for camping use.
Any suitable aluminum or aluminum alloy can be used.

The aluminum material is treated by degreasing the aluminum material using a conventional method, washing it with water, and then bringing it into contact with a mixed composition consisting of a water-soluble zirconium compound and a water-soluble polymer having a hydroxyl group or a carboxyl group. The method can be carried out by any conventional method, such as a spray method, a dipping method, a roll foot method, etc. After this treatment, it is dried, but it is sufficient if it is substantially dried. The drying temperature is preferably 15 to 260°C, and the drying time varies depending on the temperature.

The aluminum material for caps with the coating base obtained in this way has good slip properties, and even when top foot is applied directly, the coating film has good 411 adhesion, making it possible to omit the size coat. be.

Next, examples of aluminum for caps having a paint base film according to the present invention will be described, and further comparative examples will be described.

Example 1 Aluminum material for cap (1200, 0, 23 mn
JJ, H34) was sprayed with 3% Ridrine 322N-4 (manufactured by Nippon Paint) for 5 seconds to degrease it, washed with water, dried, and 10 g of polyacrylic acid (as solid content) and 60 g of ammonium zirconium carbonate were added to water in Step 11. The compositions (aqueous solutions) prepared were diluted with water in various ways, applied with a coater at 25°C, and dried at 110°C for 5 seconds to prepare test materials. The film amount is based on the dilution rate and the coating conditions iJ%E
and the amount of zirconium attached is 0.5 to 50+ng/111
Two types were prepared.

Top coat these test materials as they are (manufactured by Kansai Paint, ST-6832B, baked at 180°C for 10 minutes)
The painted material was baked at 180℃ for 10 minutes, and then the top coat was applied.
Processing that performs trimming processing at the same time as drawing) is carried out,
The (11) adhesion of the coating film was evaluated.

The evaluation was based on the state of peeling of the paint film on the trimmed area, and 5 points were given for no peeling at all, 0 points were given for peeling all around, and points were given depending on the peeling condition. The score was 5 points, indicating that the adhesion of the coating film was good.

Example 2 A composition (water-soluble 1) containing 18/1 hydroxymethyl cellulose and log/l ammonium zirconium carbonate was applied to aluminum cap material that had been degreased, washed, and dried in the same manner as in Example 1. sec IJ], squeezed with a rubber roll, and dried at 1.50°C for 20 seconds to produce a test material with a zirconium adhesion amount of 4 tons/m2. In the same manner as in Example 1, these test materials were subjected to a through-drawing process, and the adhesion of the paint film was evaluated. All test materials were given a score of 5.

Example 3 5 g/l of acrylic copolymer (a copolymer of acrylic acid and unsaturated carboxylic acid) and 3 g/l in terms of silicon oxide were added to an aluminum material for a cap that had been degreased, washed, and dried in the same manner as in Example 1. A composition (aqueous solution) containing 1 of sodium fluorozirconate was applied using a roll coater, and after drying at 70°C for 20 seconds, the adhesion of the coating film 11 was evaluated in the same manner as in Example 1. Adhesion is all 5
It was a good score.

Comparative Example 1 After drying, size coat (manufactured by Kansai Paint Co., Ltd., X
A coating material was prepared by applying the same top coat as in Example 1 on the coating material (J-C119F, baked at 180° C. for 10 minutes), and the staining properties of the coating film after coating were evaluated.

41 adhesion was 2.3 points.

Comparative Example 2 A coating material was prepared by applying a top foot to the same degreased and water-washed aluminum material for the cap as in Example 1 after drying.
After drawing through, the adhesion of the coating film was evaluated. (81 Adhesion was 0.3 points.

Comparative Example 3 After degreasing, washing with water, and drying in the same manner as in Example 1, a phosphoric acid chromate treated aluminum material for camping was prepared, and the amount of chromium deposited was 30+aH/l112.4h8/m2.

In the same manner as in Example 1, a coating material in which a top coat was applied as is and a coating material in which a top foot was applied after dry baking were prepared, and the adhesion of the coating film after drawing was evaluated. The 4=I adhesion of the coating material that was not baked was 5 points, but the adhesion of the coating material that was baked was 2 points or less, which was poor.

The attached drawing is a diagram showing the effect of zirconium content and dry firing on paint film adhesion.As can be seen from this attached drawing, paint film adhesion deteriorates when the zirconium adhesion amount exceeds 0.5 Ing/m2. It has become much better,
It is clear that it is extremely superior when compared to Comparative Examples 1 and 2. In this attached drawing, -〇-〇- indicates the top foot only without skewering, -. -S-m- indicates the size coat top foot, S indicated by an arrow in the figure is Comparative Example 1, and S' also indicated by an arrow indicates Comparative Example 2.

As explained in detail above, the aluminum material for caps having a paint base film according to the present invention exhibits an excellent effect of showing excellent paint film adhesion.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the influence of the amount of zirconium and dry firing on the adhesion of the coating film 111.

Claims (1)

[Claims] As a base film for resin coating for molding on aluminum or aluminum alloy substrates, the amount of zirconium deposited is 0.
．． An aluminum material for a cap having a coating base film, characterized in that a mixed film of a silicone compound and a polymer having a hydroxyl group or a carboxyl group is provided in an amount of 5 mg/m2 or more.