JP2001303273A - Surface treated aluminum sheet with resin coating for drawing and ironing and container for capacitor package using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface treatment method for an aluminum sheet used for a resin coated aluminum sheet which obviates the occurrence of defects, such as interlayer separation and cracking in resin layers, when the aluminum sheet is subjected to drawing and ironing and is subjected to further working in addition thereto, a surface treated aluminum sheet subjected to this surface treatment, a resin coated aluminum sheet formed by coating the surface treated aluminum sheet with a thermoplastic resin, a container formed by subjecting this sheet to drawing or drawing and ironing and more particularly a container for capacitor package. SOLUTION: The aluminum sheet is subjected to phosphoric acid chromate treatment and is then treated in a solution containing the specific phenolic polymer expressed by the following formula (1) or the aluminum sheet is subjected to the phosphoric acid chromate treatment then to silane treatment to form the surface treated aluminum sheet which is then coated with the thermoplastic resin to form the resin coated aluminum sheet. This resin coated aluminum sheet is subjected to drawing and ironing is formed to the container for capacitor package.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin-coated surface-treated aluminum plate for drawing and ironing and a container using the same. More specifically, by applying a surface treatment to an aluminum plate and coating the surface-treated aluminum plate with a thermoplastic resin, the resin exhibits excellent processing adhesion when coated with the resin, and is drawn or drawn and ironed. And even if further processing is performed on those processing, defects such as delamination and cracks in the resin layer do not occur,
A resin-coated aluminum plate, and a container formed by drawing or drawing and ironing the resin-coated aluminum plate,
In particular, the present invention relates to a container used for a container for a condenser.

[0002]

2. Description of the Related Art A polyamide resin-coated aluminum plate obtained by coating an aluminum plate with a polyamide resin is used for various purposes such as an outer container of an electrolytic capacitor by utilizing the excellent properties of the polyamide resin such as workability, corrosion resistance and electric insulation. Used in the field of In most of these uses, since the polyamide resin-coated aluminum plate is used after being molded to some extent, it is indispensable that the polyamide resin layer does not peel or break during the molding process. Therefore, for the purpose of obtaining a polyamide resin-coated aluminum plate having excellent processing adhesion, the following various attempts have been made.

For example, after a surface of an aluminum material is coated with an adhesive containing a polyamide resin and an isocyanate compound, a laminated aluminum material for an electrolytic capacitor case is formed by laminating a polyamide film, a polyolefin film, and a polyester film ( JP-A-4-266004), a phosphoric acid chromate-treated film on the surface, a film composed of an organic resin and Cr,
The aluminum plate on which any one of the chemical conversion coating containing Zr and the chemical conversion coating containing Ti is formed is preheated, and the polyamide resin melted between the cooled pressure roll and the aluminum plate is flowed down from the extruder. Pressure bonding method (Japanese Patent Application Laid-Open No. 10-303085), a silane coupling agent having an amino group is applied to an aluminum base plate and dried to form an intermediate layer, and then a polyamide resin film is laminated or melted. A method has been proposed in which a polyamide resin is extruded from an extruder into a film shape on an aluminum base plate and pressure-bonded (Japanese Patent Laid-Open No. 11-216804). The aluminum plate coated with these polyamide resins and the like is difficult to peel off the polyamide resin in the processed portion only by performing drawing or drawing and ironing, but when subjected to post-heating after processing, for example, at 260 to 270 ° C. When the resin layer is immersed in a heated solder bath for about 20 seconds, the resin layer may be peeled off, and it cannot be said that the resin layer has sufficient processing adhesion.

[0004]

SUMMARY OF THE INVENTION According to the present invention, defects such as delamination and cracks in a resin layer do not occur when drawing or drawing and ironing and further processing are performed. A resin-coated aluminum plate for drawing and ironing obtained by coating a thermoplastic resin on a surface-treated aluminum that has been subjected to a surface treatment of an aluminum plate used for a resin-coated aluminum plate with excellent processing adhesion, and drawing the resin-coated aluminum plate Another object of the present invention is to provide a condenser exterior container formed by drawing and ironing.

[0005]

According to the present invention, a resin-coated aluminum plate for drawing and ironing is a polymer in which a lower layer is a phosphoric acid chromate film and an upper layer is a structural unit represented by the following formula (1). A two-layer coating consisting of

[0006]

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(In the formula (1), X1 is independently represented by a hydrogen atom or the following formula (2) in the structural unit, and Y1 is represented by a hydrogen atom or the following formula (3))

[0008]

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(In the formula (2), R1 and R2 independently represent a hydrogen atom, a C1 to C10 alkyl group, or a C1 to C10 hydroxyalkyl group.)

[0010]

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(In the formula (3), R3 and R4 independently represent a hydrogen atom, a C1 to C10 alkyl group or a C1 to C10 hydroxyalkyl group;
In the case where Y1 is a group represented by the above formula (3), each of the structural units represented by the above formula (1) is independently represented by a hydrogen atom or the above formula (2); In the formula, the introduction ratio of the formula (2) is 0.2 to 0.2 per benzene ring.
1.0),

In addition, 3 to 50 mg on the surface of the aluminum plate
/ M²Amount of chromium and 2 to 15 mg / m ²Amount of carbon
Characterized by forming a surface treatment film containing
Or a lower layer of phosphoric acid chromate skin on an aluminum plate
A two-layer film consisting of a silane-treated film and an upper layer was formed.
And then coated with a thermoplastic resin,
3 to 50 mg / m as chromium on the surface of the nickel plate²Amount of
Phosphoric acid chromate-treated film of 2-10 mg / m
²To form a surface treatment film containing silicon in the amount of
It is characterized by the following. Further, the tree for drawing and ironing of the present invention
The grease-coated aluminum plate is such that the aluminum plate is made of Al
99% or more, and the tensile strength is 60 to 350 N / mm
²An aluminum alloy plate which is
Polyamide resin or polyester resin
Wherein the polyester resin further comprises
Melting point: polyester resin with melting point of 220 to 260 ° C, lower layer
Is a polyester resin having a melting point of 200 to 230 ° C., and
The melting point of the upper polyester resin is lower than the lower polyester resin.
Higher than the melting point of fat, it is a two-layer polyester resin.
Further, the polyester resin is non-oriented, and
Furthermore, the intrinsic viscosity of the polyester resin is 0.6 to 1.2.
It is characterized by being. Further, the capacitor of the present invention
-For the exterior container, squeeze the above resin-coated aluminum plate
It is characterized by being processed by drawing or ironing
You.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS It has been known that, when a polyamide resin such as nylon is coated on an aluminum plate, the aluminum plate is inferior in adhesion, especially in processing adhesion. In particular, an aluminum plate heated to a temperature equal to or higher than the melting point of the resin to be coated is directly in contact with the resin film without interposing an adhesive or the like, and is sandwiched and laminated by a pair of laminating rolls to cover and coat. When the film lamination method is used, it is extremely difficult to obtain a polyamide resin-coated aluminum plate having sufficient processing adhesion, and a means for exhibiting strong processing adhesion is required. In the present invention, a surface-treated aluminum plate is formed by forming a surface-treated film composed of a phosphoric acid chromate-treated film and a film containing a phenolic compound on an aluminum plate, or a surface-treated film composed of a phosphoric acid chromate-treated film and a silane-treated film. Then, by coating this with a thermoplastic resin to form a resin-coated aluminum plate, a resin-coated aluminum plate having excellent processing adhesion, particularly even when heated after processing, can be obtained, and in particular, It has been found that by coating a polyester resin, a resin-coated aluminum plate for drawing and ironing having excellent adhesion can be obtained without interposing an adhesive between the resin and the aluminum plate.

Hereinafter, the present invention will be described in detail. The aluminum plate used for the resin-coated aluminum plate of the present invention contains 99% or more of Al and has a tensile strength of 60 to 350.
Aluminum alloy sheet called JIS is N / mm ²
It is preferable to use an aluminum alloy plate based on H4000, which is a 1100-based material. However, the material is not particularly limited as long as it is a pure aluminum plate or an aluminum alloy plate that can be processed into a predetermined shape and has a required strength. .

Next, the surface treatment film applied to the aluminum plate will be described. In the present invention, any one of a surface treatment film composed of a phosphoric acid chromate treatment film and a film containing a phenol compound (A treatment film) and a surface treatment film composed of a phosphoric acid chromate treatment film and a silane treatment film (Otsu treatment film) It is preferable to form a surface treatment film of the above.

First, a method of forming the upper treatment film will be described. A phosphoric acid chromate treatment is applied to the aluminum plate as a pretreatment. As a phosphoric acid chromate treatment, an aluminum plate is immersed in an aqueous solution in which phosphoric acid and chromic anhydride are mixed, and an aqueous solution in which hydrofluoric acid is further mixed, or these aqueous solutions are sprayed or applied to the aluminum plate to form a treated film. Can be generated.

Then, as a post-treatment, an aqueous solution containing at least 0.1 g / l of the polymerized unit of the above formula (1) (pH 2.5 to
Process in 6.5). As a treatment method, the above-mentioned phosphoric acid chromate-treated aluminum plate is immersed in the above-mentioned solution, or the above-mentioned aqueous solution is sprayed or applied to the phosphoric acid chromate-treated aluminum plate, thereby forming a film on the chromate film. Further, a treated film containing a phenol compound can be generated.

In the formula (2), R1 and R2 represent C1
If one or more of the alkyl groups or hydroalkyl groups is used, the formed film becomes coarse and the corrosion resistance decreases, which is not preferable.

In the formula (3), R3 and R4 represent C1
The use of one or more alkyl groups or hydroxyalkyl groups is not preferred because the formed film becomes coarse and the corrosion resistance is reduced.

In the above formula (2), the introduction rate of the formula (2) is 0.2 to 1.0 per benzene ring.
Preferably, the number is This is, for example, assuming that a polymer in which 100 structural units represented by the above formula (1) are bonded and 100 formula (2)) are introduced.
The introduction rate of the formula (2) is 1.0 when Y1 is not the group represented by the formula (3), and Y1 is the same as the formula (3)
When it is a group represented by, it means that it is 0.5. If the introduction ratio of the formula (2) is less than 0.2, the adhesion to the aluminum plate is insufficient, and the resin film is easily peeled off during drawing and ironing. If it exceeds 1.0, the film becomes coarse and the corrosion resistance is poor. Lower, which is not preferred.

In the two-layer treatment film obtained by using the method of forming the former treatment film, the amount of chromium contained in the chromate phosphate film is preferably in the range of 3 to 50 mg / m ² . The amount of chromium can be quantified using a commercially available X-ray fluorescence analyzer, and the amount of carbon can be measured using a commercially available surface carbon analyzer. 3mg of chromium
If it is less than / m ^2, the film formed by the post-treatment performed after the pre-treatment tends to be thick, which causes a decrease in adhesion,
Not preferred. On the other hand, if it exceeds 50 mg / m ² , the thickness of the pretreatment film becomes too large, which also causes a decrease in adhesion, which is not preferable. Further, the film formed by the post-treatment is made of a polymer having the structural unit represented by the above formula (1), and the amount of carbon contained in the film is preferably in the range of ^{2 to} 15 mg / m ^2. . When the amount of carbon is less than 2 mg / m ^2, the thickness of the film formed by the post-treatment is not sufficient, and the effect of improving the adhesion is not sufficient. 15m on the other hand
If it exceeds g / m ² , the adhesion will not be further improved, and it will be uneconomical, which is not preferable.

Next, a method of forming the second treatment film will be described. As a pretreatment, a phosphoric acid chromate treated film is formed by using a known phosphoric acid chromate treating method. The coating amount is preferably ³ to 50 mg / m ² as chromium. If the amount is less than 3 mg / m ² , sufficient processing adhesion of the resin film cannot be obtained, and if it exceeds 50 mg / m ² , the thickness of the expensive silane-treated film to be formed further on this film must be increased. Sufficient working adhesion of the film cannot be obtained, and it is not economical. Preferably 5 to 30 mg /
a m ^2.

After the phosphoric acid chromate film is formed on the aluminum plate as described above, a silane-treated film is further formed thereon. As the silane treatment, a commercially available silane coupling agent is diluted in a solvent, applied to an aluminum plate, and dried. As the solvent, water alone or a mixture of water and an organic solvent such as ethanol soluble in water may be used. The concentration of the silane coupling agent is 0.5 to
Preferably it is 20%. Although the amount of treatment depends on the amount of the film formed by the phosphoric acid chromate treatment prior to the silane treatment, the amount of silicon is preferably ² to 10 mg / m ² from the viewpoint of processing adhesion of the resin film and economy. Thus, a surface-treated aluminum plate can be obtained.

In the present invention, the surface-treated aluminum plate obtained as described above is coated with a thermoplastic resin. The thermoplastic resin is obtained by extruding a resin melted by heating from an extruder directly onto the surface-treated aluminum plate. Extrusion method of laminating, or film lamination method in which a resin film is brought into contact with a surface-treated aluminum plate heated to a temperature equal to or higher than the melting point of the resin, and the two are sandwiched and laminated by a pair of laminating rolls. May be covered by
After lamination on the aluminum plate, it is indispensable that it is in a non-oriented state in order to ensure good workability and adhesiveness. As the thermoplastic resin, polyethylene, polypropylene, or a polyolefin resin such as an ethylene-propylene copolymer can also be used, but since the resin is slightly soft and easily scratched, it is preferable to use a polyamide resin or a polyester resin. .

As the polyamide resin, 6-nylon, 1
1-nylon, 12-nylon, 66-nylon, 61
It is also possible to use 0-nylon, 612-nylon, and copolymerized nylon consisting of two or more of these nylon resins. Further, 6-nylon, 66-nylon and the like are used as hard segments, and polyether and polyester are used as soft segments. It is also possible to use a segmented polyamide elastomer.

As the polyester resin, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene isophthalate (PE)
I), polybutylene isophthalate (PBI), polyethylene naphthalate (PEN), ethylene terephthalate / ethylene isophthalate copolymer (PETI), butylene terephthalate / butylene isophthalate copolymer (PBTI), and 2 of these resins Excellent adhesion even when laminated without interposing an adhesive between the resin and the aluminum plate by using a blended resin that mixes two or more of these resins and a multilayer resin that laminates two or more of these resins Is obtained. As a multilayer resin, the upper layer has a melting point of:
Polyester resin at 220 to 260 ° C, lower layer has a melting point of 2
The polyester resin of 00 to 230 ° C and the melting point of the upper layer polyester resin is higher than the melting point of the lower layer polyester resin, and the two layers of polyester resin, for example, the upper layer has excellent processability and is low in isophthalic acid component, and the lower layer has PETI. It is possible to use a multilayer polyester resin film composed of two layers of PETI having excellent adhesion and a large amount of isophthalic acid component. If the melting point of the upper layer is lower than 220 ° C., the layer contracts when coming into contact with a solder bath and is easily peeled off. When the melting point of the lower layer exceeds 230 ° C., adhesion and workability become poor,
When the melting point is less than 200 ° C., the resin is easily melted and peeled when coming into contact with a solder bath. Further, these polyester resins preferably have an intrinsic viscosity of 0.6 to 1.2. If the intrinsic viscosity is less than 0.6, the impact resistance is poor,
In a resin-coated aluminum plate or a container that processed it,
When an impact is applied by dropping or the like, a crack is easily generated.
When the intrinsic viscosity exceeds 1.2, it becomes extremely difficult to form a film.

The thickness of these thermoplastic resin films after being coated on the surface-treated aluminum plate is 10 to 50 μm.
And more preferably 15 to 30 μm
It is. When the thickness is less than 10 μm, it is extremely difficult to uniformly laminate the surface-treated aluminum plate without causing wrinkles, and furthermore, a crack occurs when the obtained resin-coated aluminum plate is drawn or drawn and ironed. Easily, and the corrosion resistance and electrical insulation are significantly deteriorated. 5
If it exceeds 0 μm, it is economically disadvantageous.

The resin-coated aluminum plate for drawing and ironing of the present invention can be obtained by laminating a resin on a surface-treated aluminum plate by using an extrusion method or a film laminating method as described above. Depending on the degree, the adhesion may not be sufficient, or the corrosion resistance may be insufficient depending on the use environment. In such a case, necessary workability and corrosion resistance can be obtained by laminating a layer made of an adhesive between the thermoplastic resin and the surface-treated aluminum plate. The adhesive is selected from adhesives such as acrylic resin, urethane resin, epoxy resin, and polyester resin. These adhesives can be formed by applying to a surface-treated aluminum plate or, when laminating by a film laminating method, to either a surface-treated aluminum plate or a resin film.

[0029]

The present invention will be described in more detail with reference to the following examples. (Example) [Surface treatment] As a substrate used for the surface-treated aluminum plate of the present invention, a commercially available JIS H40 having a tensile strength shown in Table 1 is used.
1100 based material (Al content: 99% or more,
(Thickness: 0.3 mm). For the aluminum plate in Table 2, the same material as in Example 7 used in Table 1 was used. The formation of the above-mentioned instep treatment film on this aluminum plate was performed as follows.

As a pretreatment, phosphoric acid chromate
Mate treatment was performed. Nippon Parkerai as pretreatment liquid
Processing solution A manufactured by Jing Co., Ltd. (containing chromic anhydride, trade name
 AM-K702SK) and treatment solution B (containing hydrofluoric acid, trade name)
AM-K702ACK). Then, for comparison
Except for some sample substrates, there are two ways under the conditions shown in Table 1.
Was post-treated. In Table 1, as the treatment liquid C,
Solution comprising the aqueous solution of the aqueous composition (I) described above,
As D, a process comprising an aqueous solution of the following aqueous composition (II)
A physical solution was used. The bath compositions are shown below. Treatment liquid C Water-based composition (I) Solid content of the following water-soluble polymer (i): 2.0 g / l pH: 6.0 (adjusted with phosphoric acid) {Water-soluble polymer (i)} X1 is a polymer represented by (1).
A hydrogen atom or Z_1A=
-CH₂N (CH₃)₂And Y1 is a hydrogen atom;
The introduction rate of Z1A is 0.5 per benzene ring
Polymer Treatment liquid D Aqueous composition (II) The following water-soluble polymer (ii) Solid content: 5.0 g / l HF: 0.05 g / l H₂O₂: 1.0 g / l H₃PO₄: 2.0 g / l Na₂P₂O₇・ 10H₂O: 2.0 g / l pH: 3.5 (adjusted with sodium hydroxide) {Water-soluble polymer (ii)} A polymer represented by the above formula (1), wherein X1 is
A hydrogen atom or Z_1B=
-CH₂N (CH₂CH₂CH₂OH) (CH ₃) And
Y1 is a group represented by the formula (4),_1AAnd Z_1Bof
The introduction rate is 0.5 per benzene ring

[0031]

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In the formula (4), X _2B independently represents a hydrogen atom or a Z in each structural unit represented by the formula (1).
_2B = a _{-CH 2 N (CH 2 CH 2} CH 2 OH) (CH 3).

[0033]

[Table 1]

In the case of forming the above-mentioned treated film on an aluminum plate, a phosphoric acid chromate treatment was performed under the conditions shown in Table 2, washed with water, dried, and then subjected to a silane treatment. A surface-treated aluminum plate was prepared as described above. In Comparative Example 31 in Table 2, electrolytic chromic acid treatment by a cathode treatment was performed at a current density of 80 A / dm ² .

[0035]

[Table 2]

[Lamination of Thermoplastic Resin] The surface-treated aluminum plate, which is the sample substrate obtained as described above, is
And the thermoplastic resin shown in Table 4 was laminated to obtain a sample plate. Lamination is performed using a film lamination method, and the melting point (° C.) of the thermoplastic resin for laminating the surface-treated aluminum plate is 5 degrees.
It was heated to a high temperature of 〜１０10 ° C., a thermoplastic resin film was brought into contact with one surface thereof, the two were sandwiched by a pair of laminating rolls, laminated, and immediately quenched in water. Some samples were obtained by applying a urethane-based adhesive to one surface of a thermoplastic resin film in advance, and laminating them so that the adhesive-coated surface was in contact with the surface-treated aluminum plate. In Table 2, PET is polyethylene terephthalate, PETI12 and the like are ethylene terephthalate / ethylene isophthalate copolymers (numbers are mol% of ethylene isophthalate), and PETI5 / PETI15 and the like are multilayer resins of PETI5 in the upper layer and PETI15 in the lower layer. Indicates that

The working adhesion and the heat resistance after working of the resin-coated aluminum plate of the sample prepared as described above were evaluated under the following conditions. [Working Adhesion] A resin-coated aluminum plate of a sample was punched into a disk shape, drawn so that the outer surface of the cup became a resin-coated surface, and then subjected to redrawing, redrawing and ironing to obtain a diameter of 14 mm and a height of 14 mm. It is molded into a cylindrical cup with a thickness of 46 mm and the ironing rate is 50% (thickness is 50% of the original plate thickness).
A neck portion was formed on a peripheral portion having a height of 0 mm by a roll neck method, and the peeling state of the resin film on the neck portion was visually observed and evaluated according to the following five grades. Scores 5 and 4 can be used practically without problems, and scores 1 to 3 cannot be used practically. Rating 5: No peeling was observed. Rating 4: Peeling is observed in less than 10% of the neck processing corners. Rating 3: Peeling is observed in less than 10 to 50% of the neck processing corners. Rating 2: Peeling is observed at a portion of 50 to less than 90% of the neck processing corner portion. Rating 1: Peeling is observed at 90% or more of the neck processing corners.

[Heat resistance after processing] The cup after forming the above-mentioned neck portion was heated in an oven at 260 ° C. for 1 minute, and the peeling state of the resin film on the neck portion was visually observed. Of the five grades. Scores 5 and 4 can be used practically without problems, and scores 1 to 3 cannot be used practically. [Corrosion resistance] A sample of the aluminum plate after the post-treatment was
JIS Z 237
After performing the salt spray test based on No. 1 (spray time: 24 hours), the surface was visually observed and evaluated according to the following five grades. Rating 5: No change is observed. Rating 4: Slight rust generation that does not cause a problem in practical use is recognized. Rating 3: Generation of rust to such an extent as to cause a problem in practical use is recognized. Rating 2: Significant rust generation is observed. Rating 1: Rust is observed on the entire surface. The characteristics evaluation results are shown in Tables 3 and 4.

[0039]

[Table 3]

[0040]

[Table 4]

As shown in Tables 3 and 4, the resin-coated aluminum plate of the present invention has excellent properties. Next, of the above Examples or Comparative Examples, the resin-coated aluminum plates of Examples 2, 5, 10, and 13 were subjected to processing at a total drawing ratio of 2.2 and a total ironing rate of 35% to a diameter of 10 mm. When molded into a cylindrical condenser container having a height of 22 mm, no peeling of the resin layer was observed in any of the cylindrical containers.

[0042]

As described above, the resin-coated aluminum plate of the present invention is prepared by subjecting the aluminum plate to a phosphoric acid chromate treatment as a pretreatment and then as a post-treatment in a solution containing the polymerized unit represented by the formula (1). It is obtained by coating a treated surface-treated aluminum plate, or a phosphoric acid chromate treatment, and then coating a thermoplastic resin such as a polyamide resin or a polyester resin on a surface-treated aluminum plate subjected to a silane treatment as a post-treatment. Upper layer melting point: 2
20-260 ° C polyester resin, lower layer has a melting point of 20
The melting point of the polyester resin of the upper layer is 0 to 230 ° C., and the melting point of the polyester resin of the upper layer is higher than the melting point of the polyester resin of the lower layer. Even when a multi-layer polyester resin film consisting of two layers of PETI with a high isophthalic acid component with excellent adhesive properties is directly laminated without interposing an adhesive, excellent processing adhesion, especially even when heated after processing, is excellent. It has adhesiveness and can be suitably used as a container for the exterior of a capacitor.

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Keiichi Shimizu 1296-1, Higashi-Toyoi, Kudamatsu-shi, Yamaguchi Pref. CA25 CA26 CA28 CA35 CA39 DA16 EB07 EB08 4K044 AA06 AB02 BA15 BA17 BA21 BB04 BC02 BC05 CA16 CA53 CA62

Claims (11)

[Claims] 1. A two-layer film comprising a phosphoric acid chromate film as a lower layer and a polymer film comprising a structural unit represented by the following formula (1) formed on an aluminum plate, and a thermoplastic resin thereon. Resin-coated surface-treated aluminum plate for drawing and ironing by coating with (In the formula (1), X1 is independently represented by a hydrogen atom or the following formula (2) in each constitutional unit, and Y1 is represented by a hydrogen atom or the following formula (3)) (In the formula (2), R1 and R2 are each independently
Hydrogen atom, C1-C10 alkyl group, or C1-C
Which represents 10 hydroxyalkyl groups) (In the formula (3), R3 and R4 are each independently
Hydrogen atom, C1-C10 alkyl group, or C1-C
X2 represents a hydroxyalkyl group, and X2 represents a group represented by the above formula (1) when Y1 is a group represented by the above formula (3).
In each of the structural units represented by the formula (1), a hydrogen atom is independently represented by the above formula (2);
Is from 0.2 to 1.0 per benzene ring). 2. An aluminum plate having a surface of 3 to 50 mg /
characterized in that to form a surface treatment film which contains carbon in the amount of the amount of chromium and 2 to 15 mg / m ² of m ^2, drawing and ironing a resin-coated surface-treated aluminum plate according to claim 1. 3. A resin-coated surface-treated aluminum for drawing and ironing, wherein a two-layered film comprising a phosphoric acid chromate-treated film as a lower layer and a silane-treated film as an upper layer is formed on an aluminum plate and a thermoplastic resin is coated thereon. Board. 4. As chromium on the surface of an aluminum plate
Phosphoric acid chromate treated film in an amount of ^{3 to} 50 mg / m ² ,
And forming a surface treatment film containing silicon in an amount of ² to 10 mg / m ^2.
4. A resin-coated surface-treated aluminum plate for drawing and ironing described in 4. 5. The aluminum plate according to claim 1, wherein the aluminum plate contains 99% or more of Al and has a tensile strength of 60 to 350 N / mm ^2.
5. The resin-coated surface-treated aluminum plate for drawing and ironing according to any one of items 4 to 4. 6. The resin-coated aluminum plate for drawing and ironing according to claim 1, wherein the thermoplastic resin is a polyamide resin. 7. The resin-coated aluminum plate for drawing and ironing according to claim 1, wherein the thermoplastic resin is a polyester resin. 8. The polyester resin, wherein the upper layer has a melting point:
Polyester resin at 220 to 260 ° C, lower layer has a melting point of 2
The resin-coated aluminum plate for drawing and ironing according to claim 7, wherein the polyester resin at 00 to 230 ° C and the melting point of the upper layer polyester resin is higher than the melting point of the lower layer polyester resin and is a two-layer polyester resin. 9. The polyester resin is non-oriented,
A resin-coated aluminum plate for drawing and ironing according to claim 7. 10. The resin-coated aluminum plate for drawing and ironing according to claim 7, wherein the polyester resin has an intrinsic viscosity of 0.6 to 1.2. 11. A container for a condenser exterior obtained by drawing or drawing and ironing the resin-coated aluminum plate for drawing and ironing according to claim 6.