JP2003286585A - Both-side pre-coated aluminum plate excellent in press moldability and conductivity, and press-working method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a both-side pre-coated aluminum plate which is excellent in anti-static performance, and at the same time, in design effect and in which generation of cracking and peeling of a coating film can be effectively prevented during press working and excellent moldability can be realized, and also to provide a method for advantageously executing the press-working by using such a both-side pre-coated aluminum plate. <P>SOLUTION: While a lubricating coating film 16 is formed on one face of the aluminum plate 12 by applying a first organic resin paint and by hardening it, a conductive coating film 20 is formed on the other face by applying a second organic resin paint containing a conductive substance and by hardening it. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a double-sided precoated aluminum sheet having excellent press formability and conductivity and a press working method using the same, and particularly to electronic equipment such as personal computers, wireless equipment such as mobile phones, televisions and the like. It can be suitably used for the case part of electric equipment, battery case of electric vehicles and hybrid vehicles, etc., and it can realize excellent antistatic effect, and at the time of press working, coating film cracking, coating film peeling, etc. The present invention relates to a double-sided precoated aluminum sheet that can be advantageously prevented from occurring and achieves extremely excellent formability, and a pressing method using such a double-sided precoated aluminum sheet.

[0002]

2. Description of the Related Art Conventionally, an aluminum plate is characterized by being excellent in corrosion resistance and being lightweight, so that it can be formed into a desired shape by press working such as drawing or bending, and it can be used for home appliances. , OA equipment,
It has been widely used as a component in various fields such as automobile products. Further, the surface of such an aluminum plate is generally coated with an organic resin-based paint in order to ensure excellent designability, but a coating film made of such an organic resin-based paint is formed. In the pre-coated aluminum plate, most of the organic resin-based coating film is insulative, so that it is inferior in conductivity, and therefore,
Since the antistatic performance is insufficient, there is an inherent problem in that electronic devices and electric equipment products that require antistatic performance cannot fully exhibit their characteristics.

Therefore, in order to solve such a problem,
Conductive paint containing conductive material such as iron phosphide, graphite, carbon black, metal oxide, flaky or scale-like nickel filler is applied to aluminum material, and its surface is made conductive. Many methods have been proposed so far for imparting conductivity to an aluminum coating material by forming a coating film.

For example, in JP-A-5-309331 and JP-A-5-31154, iron phosphide,
A composite-coated aluminum plate (aluminum alloy plate) formed with an organic film containing a conductive substance such as graphite or carbon black in a predetermined ratio is proposed, and further, JP-A-7-212131 and JP-A-7-314601 are proposed.
Japanese Patent Laid-Open No. 8-267656 and the like propose using a flaky or scaly nickel filler as a conductive substance.

However, a conductive coating film containing such a conductive substance generally has flexibility, flexibility and stretchability as compared with an organic resin coating film containing no conductive substance. Since it becomes inferior in properties such as, when using a pre-coated aluminum plate on which such a conductive coating film is formed and performing press working such as drawing and bending, it becomes the outside especially after molding. The surface, that is, the surface that comes into contact with the die during press working, may cause problems such as cracking or peeling of the coating, or deterioration of the surface properties of the aluminum plate. Both of them could not be achieved at a high level.

[0006]

The present invention has been made in view of such circumstances, and a problem to be solved by the present invention is that the antistatic performance is excellent, the designability is excellent, and the press working is performed. Occasionally, the occurrence of coating film cracking or coating film peeling can be effectively prevented, and a double-sided precoated aluminum sheet that can achieve excellent formability, and press working using such a double-sided precoated aluminum sheet advantageously To provide a way to do.

[0007]

The present invention has been made to solve the above-mentioned problems, and the gist thereof is to provide a first organic resin-based coating material on one surface of an aluminum plate. A lubricous coating film is formed by applying and curing it, while the other surface is coated with a second organic resin-based coating material containing a conductive substance and cured to obtain the conductivity. It is a double-sided precoated aluminum plate which is excellent in press formability and conductivity and is characterized in that a conductive coating film is formed.

That is, in such a pre-coated aluminum plate according to the present invention, a lubricating coating film and an electrically conductive coating film made of an organic resin coating material are formed on both surfaces of the pre-coating aluminum plate. By such a lubricating coating, it is possible to secure a high degree of designability, and by making the surface on the side on which the lubricating coating is formed an outer surface after molding, coating cracks and coatings can be formed. The occurrence of peeling or the like can be extremely advantageously prevented, and excellent press formability can be realized, while the conductive coating film can effectively improve the antistatic performance.

According to one of the preferred embodiments of the double-sided precoated aluminum plate according to the present invention, the lubricous coating film is a polyester resin 10 having 400 to 1000 carbon atoms.
Inner wax is 0.2 to 5.0 with respect to 0 parts by weight.
Using the polyester resin-based coating material contained in the proportion (A) in parts by weight as the first organic resin-based coating material, 5
It is desirable that the film is formed with a film thickness of up to 30 μm, and by adopting such a configuration, it is possible to more advantageously prevent the occurrence of coating film cracking, coating film peeling, etc. during press working, which is excellent. The moldability can be realized.

According to another preferred embodiment of the present invention, the conductive coating film has 400 to 10 carbon atoms.
100 parts by weight of polyester resin having a particle diameter of 1 to 2 times the film thickness of the conductive coating film,
A spherical Ni filler having a major axis ratio of 0.7 to 1 and an inner wax were each contained in an amount of 1 to 20 parts by weight and 0.
It is desirable that the polyester resin-based paint contained in the proportion (B) of 1 to 4.0 parts by weight is used as the second organic resin-based paint to have a film thickness of 1 to 20 μm. By adopting such a configuration, on the surface on which the conductive coating film is formed, extremely excellent conductivity is expressed as compared with the conventional one, and the antistatic performance is effectively improved, and the aluminum plate The metallic luster is secured to a sufficiently high level, and the press moldability of such a coating film can be effectively enhanced.

Furthermore, the blending ratio (B) of the inner wax in the second organic resin-based paint is 0.2 to 0.8 times the blending ratio (A) of the inner wax in the first organic resin-based paint. Is even more desirable.

[0012] In addition, according to another preferred embodiment of the double-sided precoated aluminum sheet excellent in press formability and conductivity according to the present invention, the lubricous coating film and the conductive coating film are treated by a base treatment. , Coating type or reactive type,
It is desirable that it is formed on the surface of the aluminum plate on which the chromate layer or the non-chromate layer is formed, whereby the adhesion between the lubricating coating film and the aluminum plate,
And, the adhesion between the conductive coating film and the aluminum plate, respectively, can be effectively improved, and even more excellent corrosion resistance can be realized, and under the coating film caused by corrosive substances such as water and chlorine compounds. Corrosion is suppressed, corrosion resistance is excellent, and problems such as coating film swelling and coating film peeling can be advantageously prevented.

Further, in the present invention, when the double-sided precoated aluminum plate having excellent press formability and conductivity as described above is used for press working, the lubricous coating film on the double-sided precoated aluminum plate is A gist of a press working method is characterized in that the formed surface is located on the die side while the surface on which the conductive coating film is formed is located on the punch side.

As described above, among the coated surfaces of the double-sided precoated aluminum sheet as described above, the surface on which the lubricating coating film is formed is located on the die side, and the surface on which the conductive coating film is formed is located on the punch side. If the press working is performed, the object of the present invention can be effectively achieved.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, in order to more specifically clarify the present invention, embodiments of the present invention will be described in detail with reference to the drawings. However, in the drawings to be described later, their thickness is exaggerated and shown in a larger ratio than it actually is so that the presence of each layer such as a coating film formed on the surface of the aluminum plate can be easily recognized. It should be understood.

First, FIG. 1 shows a specific example of a double-sided precoated aluminum sheet according to the present invention, which is set in a press molding machine. Then, the double-sided pre-coated aluminum plate 10 is based on the aluminum plate 12 and has a lubricating coating 16 on the surface on the die 14 side (lower surface in FIG. 1) and a surface on the punch 18 side (FIG. 1). Conductive coating film 2 having conductivity on the inside and upper surface)
0 has the form formed respectively.

More specifically, as shown in FIG. 2, the surface of the aluminum plate 12 on the side of the die 14 is provided with a base treatment layer 22 between it and the above-mentioned lubricous coating film 16, and The surface of the aluminum plate 12 on which such a base treatment layer 22 is formed is coated with the first organic resin-based coating material and cured, whereby the lubricating coating film 1 is formed.
6 is laminated.

By the way, as the first organic resin type coating material for forming the lubricating coating film 16, it is desirable that it has excellent flexibility and excellent corrosion resistance after curing (after drying). , The main component of paint resin (organic resin) is polyester resin, epoxy resin, acrylic resin, fluororesin, or urethane resin, polyester resin-based paint, epoxy resin-based paint, acrylic resin-based paint, fluororesin-based paint, Alternatively, conventionally known organic resin-based paints such as urethane resin-based paints can be exemplified, but in the present invention, among them, particularly, a polyester resin having a carbon number of 400 to 1000 is used as a main component. The polyester resin-based paint that contains it can be suitably adopted, and by adopting such a paint Flexibility and bendability, so that extremely excellent lubricity coating 16 may be formed on the properties of stretchability and the like.

The polyester resin has 400 carbon atoms.
If the amount is less than the above, and the amount is too small, the coating film is excessively cured after the curing treatment (after the drying treatment) to reduce the flexibility of the coating film. Since film cracking and coating film peeling will occur, on the contrary,
If the number of carbon atoms exceeds 1,000 and becomes excessive, the coating film will not be sufficiently cured after the curing treatment, resulting in problems such as deterioration in corrosion resistance and weather resistance.

Further, the first organic resin-based coating material includes
It is desirable that the inner wax is contained in a predetermined ratio, whereby the lubricating coating film 1
The press moldability of No. 6 can be more effectively improved. In addition, as such inner wax,
Various conventionally known substances can be adopted, for example, animal waxes such as lanolin; plant waxes such as carnauba; synthetic waxes such as polyethylene wax and Fischer-Tropsch wax; paraffin wax, microcrystalline wax, petrolatum and the like. Petroleum wax and the like can be exemplified, and one or more of these can be appropriately selected and used.

Further, the blending ratio (A) of the inner wax is 0.2 to 5.0 parts by weight with respect to 100 parts by weight of the above-mentioned coating resin (preferably a polyester resin having 400 to 1000 carbon atoms). The ratio of parts can be suitably adopted. If the blending ratio (A) of the inner wax is too small, the lubricating coating film 1
This is because the lubricity of No. 6 may be reduced and peeling of the coating film may occur at the time of molding. On the contrary, when the amount is excessive, the flexibility of the lubricous coating film 16 becomes low and the corrosion resistance decreases. Because there is a risk of doing so.

In addition, in order to improve the appearance of the press-formed product, a conventionally known pigment such as a pearl pigment may be added to the above-mentioned first organic resin coating material. Is also desirable.

The thickness of the lubricating coating film 16 made of the first organic resin paint as described above (see FIG.
It is desirable that D ₁ ) is 5 to 30 μm. This is because the thickness D ₁ of the lubricating coating 16 is
When the thickness is less than 5 μm and is too thin, the lubricating coating film 16 is reduced as the thickness of the aluminum plate 12 is reduced by stretching.
The film thickness of the lubricating coating film 16 after molding becomes very thin because the film thickness: D ₁ further decreases, and the corrosion resistance decreases, and conversely, when it exceeds 30 μm, This is because if the thickness is too large, the bending workability of the lubricous coating film 16 deteriorates, and coating film cracking or coating film peeling may occur at the processed portion.

On the other hand, as shown in FIG. 3, the surface opposite to the surface on which the lubricating coating 16 is formed, that is, the surface on which the punch 18 is in contact, is electrically conductive. The conductive coating film 20 having the above is formed, and the ground treatment layer 23 is also provided between the conductive coating film 20 and the aluminum plate 12. On the surface of the aluminum plate 12 on which 23 is formed,
The second organic resin-based paint containing a conductive substance is applied and cured to form the conductive coating film 20 in a laminated manner.

By the way, the organic resin coating material for forming the conductive coating film 20 has excellent flexibility after curing (after drying) and has good adhesion to a conductive substance described later, It is desirable that the resin has excellent corrosion resistance. For example, the main component of the coating resin (organic resin) is polyester resin, epoxy resin, acrylic resin,
Examples of conventionally known organic resin-based paints such as polyester resin-based paints, epoxy resin-based paints, acrylic resin-based paints, fluororesin-based paints, and urethane resin-based paints that are fluororesins or urethane resins It is possible, but among them, especially the carbon number is 40
A polyester resin-based paint containing 0 to 1000 polyester resin as a main component can be preferably adopted for the same reason as the above-mentioned first organic resin-based paint, and by adopting such a paint. , A conductive coating film 20 having extremely excellent characteristics such as flexibility, flexibility and stretchability
Can be formed.

Incidentally, by adding and containing a conductive substance to such an organic resin-based paint, a second organic resin-based paint which is a conductive paint is prepared. Examples of the conductive substance used in the present invention include fine particle nickel filler,
There are various known conductive powders and particles, and among them, in particular, the thickness of the conductive coating film 20 (D _{2 in} FIG. 3) is 1
.About.2 times the particle size, and the ratio of the minor axis / major axis is 0.
A spherically shaped Ni filler in the range of 7 to 1 can be suitably adopted. Then, by using such a specific Ni filler 24, as shown in FIG. 3, the Ni filler 24 does not form a continuous layer in the conductive coating film 20, and a part thereof is conductive. It is arranged so that it is exposed to the surface 26 of the coating film 20 or protrudes from it, whereby extremely excellent conductivity can be realized, and the entire surface of the aluminum plate 12 is covered with the Ni filler. The metallic luster of the aluminum plate 12 can be ensured to a sufficiently high level without being covered with 24. Furthermore, by using a Ni filler of such a size, even if press working is applied, The occurrence of problems such as film cracking can be advantageously prevented, and extremely excellent press formability can be realized.

Although it is possible to employ flaky or scaly Ni filler having a minor axis / major axis ratio of less than 0.7 as the conductive substance, in order to secure sufficient conductivity. Must contain a large amount of Ni filler. Therefore, as shown in FIG. 4, in the conductive coating film 20 ', the Ni fillers 24' are continuously overlapped with each other to form the base treatment layer 23 '. Almost the entire surface of the formed aluminum plate 12 'is covered with the Ni filler 2
Since the aluminum plate 12 'is covered with 4', the metallic luster originally possessed by the aluminum plate 12 'is lost, and the appearance color tone is deteriorated. Therefore, as described above, the conductive coating is used. Film thickness of film 20: D ₂
1 to 2 times the particle size, and the ratio of minor axis / major axis is 0.7
It is even more desirable to employ a spherical Ni filler 24 of ˜1.

The particle size of the Ni filler 24 is
When the thickness is less than 1 time the film thickness of the conductive coating film 20, such Ni filler 24 is buried in the coating film 20 and sufficient conductivity cannot be obtained. On the contrary, if it exceeds 2 times, on the contrary, the Ni filler 24 is likely to be detached from the coating film 20, so that it is not possible to secure high conductivity, and the corrosion resistance is deteriorated. There is an inherent problem that may be feared.

The thickness of the conductive coating film 20: D ₂
Is preferably 1 to 20 μm. This is because when the film thickness D _{2 of the} conductive coating film 20 is less than 1 μm and is too thin, the corrosion resistance becomes insufficient, and when it exceeds 20 μm and becomes too thick. In addition, the cost is increased, the economical efficiency is deteriorated, and the particle size of the Ni filler 24 to be added is inevitably large, which makes it difficult to uniformly disperse the Ni filler 24 in the paint, resulting in uneven coating. This is because there is a risk of occurrence of heat generation, deterioration of lubricity, and deterioration of press formability.

Further, the addition ratio of the above Ni filler 24 is 1 to 20 parts by weight with respect to 100 parts by weight of the coating resin (preferably a polyester resin having 400 to 1000 carbon atoms) in the coating material. Is preferably adopted. This is because when the addition ratio is less than 1 part by weight, sufficient conductivity cannot be obtained, and conversely, when the addition ratio exceeds 20 parts by weight, the conductivity reaches a ceiling. However, further improvement cannot be expected, the metallic luster originally possessed by the aluminum plate 12 is lost, the appearance color tone is deteriorated, and the corrosion resistance effect of the coating resin cannot be sufficiently exerted, resulting in deterioration of corrosion resistance. This is because there is a risk of causing problems such as being caused.

As described above, the second organic resin coating material (conductive coating material) containing a conductive substance.
Even if there is, like the first organic resin-based paint described above,
It is desirable that the inner wax is contained in a predetermined ratio, and thereby, the press formability of the conductive coating film 20 can be more effectively improved. The blending ratio of this inner wax (B)
As the coating resin in the coating (preferably having a carbon number of 40
A ratio of 0.1 to 4.0 parts by weight with respect to 100 parts by weight of the polyester resin (0 to 1000) can be suitably adopted.

If the blending ratio (B) of the inner wax is too small, the lubricity of the conductive coating film 20 may be deteriorated and the coating film may be peeled off at the time of molding. On the other hand, if the amount is too large, the bending workability of the conductive coating film may be deteriorated, and problems such as coating film cracking and coating film peeling may occur in the processed portion.

In particular, as shown in FIG. 1, when the double-sided precoated aluminum plate 10 is arranged in a press molding machine so that the surface on which the conductive coating film 20 is formed is on the punch side, the inner wax described above is used. Blending ratio of (B)
Among them, as described above, the blending ratio (A) of the inner wax contained in the first organic resin-based coating material is 0.2 to
The compounding ratio to be 0.8 times, that is, the compounding ratio (B) of the inner wax in the second organic resin-based paint to the compounding ratio (A) of the inner wax in the first organic resin-based paint (= B / A A ratio of 0.2 to 0.8 can be particularly preferably adopted. this is,
In press working such as deep drawing, by reducing the friction coefficient on the upper surface 28 of the die 14, the tensile force at the die shoulder portion 30 can be reduced, while the friction coefficient at the punch shoulder portion 32 can be reduced. By making it larger than the friction coefficient of the shoulder portion 30, it is possible to move the fracture risk portion away from the center of the punch, that is, the portion of the aluminum plate 10 that is in contact with the die shoulder portion 30 is pulled by the upper surface 28 of the die 14 to reduce the wall thickness. This is because thinning and breakage can be advantageously prevented, whereby the deep drawing limit can be improved. In addition, when such (B / A) is less than 0.2 times, the conductive coating film 20
In this case, the lubricity in 1 may be deteriorated and the coating film may be peeled off. If it exceeds 0.8 times, the above effect cannot be obtained.

By the way, by using the first and second organic resin type coating materials as described above, a double-sided precoated aluminum plate 10 having a lubricous coating film 16 and a conductive coating film 20 provided on each one side is obtained. First, it is desirable to first perform a predetermined undercoat treatment on the surface of the aluminum plate 12, whereby the undercoat treatment layers 22 and 23 are respectively formed on the surface of the aluminum plate 12. .

Examples of such surface treatment include chromate treatment with chromate chromate, chromate phosphate, etc .; non-chromate treatment with titanium phosphate, zirconium phosphate, molybdenum phosphate, zinc phosphate, etc. other than chromium compounds. The so-called chemical film treatment, so-called chemical conversion treatment, is preferably adopted. Then, the undercoating layers 22 and 23 (first
By the existence of the layer), the adhesion between the aluminum plate 12 and the lubricating coating film 16 (second layer), and the aluminum plate 12
The adhesion between the conductive coating film 20 and the conductive coating film 20 (second layer) can both be effectively improved, and further excellent corrosion resistance can be realized, and corrosive substances such as water and chlorine compounds are aluminum. Under-coating corrosion that occurs when it penetrates into the surface of the plate is suppressed, and swelling of the coating film and peeling of the coating film can be advantageously prevented.

There are reaction type and coating type chemical conversion treatment methods such as chromate treatment and non-chromate treatment as described above, but in the present invention, whichever method is adopted, it does not matter at all. . Further, although it does not matter if different surface treatments are separately applied to the respective surfaces of the aluminum plate 12, it is preferable that the same surface treatments be simultaneously performed.

After the surface treatment layers 22 and 23 are formed by the surface treatment as described above, the lubricous coating film 16 is formed on one surface and the conductive coating film 20 is formed on the other surface.
Each will be formed. Here, the lubricous coating film 16 and the conductive coating film 20 are formed by using the first organic resin-based coating material and the second organic resin-based coating material as described above, respectively, on the surface treatment layer 22, on the surface of the aluminum plate 12. 23
A double-sided pre-coated aluminum plate having excellent press-formability and conductivity is formed by coating each of the above-mentioned materials in accordance with a conventional method and then curing.

Here, the coating method is not particularly limited, and various conventionally known methods such as a roll coating method, a bar coating method, a dip coating method, and a spray method can be appropriately adopted. In addition, even under the curing conditions (baking conditions) for forming the lubricous coating film 16 and the conductive coating film 20, they are appropriately selected according to the type of the coating resin and the like. . In addition, if the paint resin that constitutes the first organic resin-based paint and the paint resin that constitutes the second organic resin-based paint are of the same resin type, both sides can be baked at the same time. It is advantageous in terms of cost.

Thus, in the double-sided precoated aluminum plate 10 produced as described above, the lubricating coating film 16 made of the first organic resin-based paint is formed on one surface, while the other is Since the conductive coating film 18 made of the second organic resin-based coating material is formed on the surface, the lubricating coating film 16 can ensure a high degree of design, and the coating film may be cracked or peeled off. It is possible to extremely effectively prevent the occurrence of the above phenomenon and to realize excellent press formability, and, on the other hand, the conductive coating film 20 effectively improves the antistatic performance.

Further, as the first organic resin type coating material for forming the lubricous coating film 16, the inner wax is contained in a predetermined ratio, and the carbon number is 400 to 10 respectively.
A polyester resin-based paint having a polyester resin of No. 00 as a paint resin is used, and the film thickness of the lubricating coating film 16 is 5
If it is set to -30 μm, the lubricating coating 16 is provided with further excellent characteristics such as flexibility, flexibility and stretchability,
As a result, even more excellent press formability can be realized.

Further, as a second organic resin type paint (conductive paint) for forming the conductive coating film 20, a Ni filler 24 and an inner wax having a specific shape and size are used.
Each contains 4 carbon atoms
A polyester resin-based paint having a polyester resin of 0 to 1000 as a paint resin is used, and a conductive coating film 20 is also used.
If the thickness of the film is 1 to 20 μm, N in the conductive coating film 20
By the i filler 24, the conductivity is extremely effectively improved, a more excellent antistatic performance can be exhibited as compared with the conventional one, and the metallic luster of the aluminum plate is ensured to a sufficiently high level. The press formability of the film can also be effectively enhanced.

By the way, the double-sided pre-coated aluminum plate 10 as described in detail above is formed into a desired shape by a pressing method such as drawing and bending according to a conventional method, and is then used for electronic devices such as personal computers and mobile phones. It will be advantageously used as a casing part in wireless devices such as telephones, electric devices such as televisions, and battery case parts of electric vehicles and hybrid vehicles. As shown in FIG. 1, the double-sided precoated aluminum plate 10 is formed so that the surface on which the lubricating coating 16 is formed is on the die 14 side and the surface on which the conductive coating 20 is formed is the punch 18. It is desirable to install it on the press molding machine so that it is on the side. As a result, it is possible to effectively prevent the occurrence of coating film cracking, coating film peeling, etc., even on the outer surface of the molded product which is prone to problems, and moreover, on the outer surface which is visible to the human eye, the lubricating coating film 10 is formed. In addition to excellent designability being imparted to the inner surface, the conductive coating film 20 can impart excellent electrical conductivity to the inner surface, so that the antistatic effect is advantageously exhibited.

Although the representative embodiments of the present invention have been described in detail above, they are merely examples, and the present invention is not limited to the specific description of such embodiments. It should be understood that it should not be construed as limiting.

For example, in the above-described embodiment, the surface treatment layers 22 and 23 are provided on each surface of the aluminum plate 12, whereby the lubricating coating film 16 and the conductive coating film 20 are provided.
However, the undercoating layers 22 and 23 are not always required in the present invention.

Further, the aluminum plate 12 to be pre-coated widely includes various conventionally known aluminum plates or aluminum alloy plates made of aluminum or aluminum alloy as long as it has a plate shape. , It can be the target.

Although not listed one by one, the present invention is
Based on the knowledge of those skilled in the art, it can be implemented in various modified, modified, and improved modes, and
It goes without saying that all such embodiments are included in the scope of the present invention without departing from the spirit of the present invention.

[0047]

EXAMPLES Hereinafter, some experimental examples including the examples of the present invention will be shown to clarify the present invention more specifically, but the present invention will be described by the description of such experimental examples. It goes without saying that it is not subject to any restrictions.

First, as an aluminum plate as a test material,
In press working, an O material of an Al-4.5% Mg alloy having a plate thickness of 1.0 mm, which is generally used, was prepared.

Then, among the prepared aluminum plates, except for the aluminum plates according to Experimental Examples 9 and 17 in Table 1 below, with respect to the surface of the aluminum plate, as shown in Table 1 below, the following Table 2 The base treatment of any one of a to e shown in FIG. Note that such a to e
For the aluminum plate to be subjected to d, e of the surface treatments of No. 1, the degreasing treatment is performed in advance, and then the base treatment is performed by the bar coat method, while the surface treatments of a to c are performed. As for the aluminum plate, the degreasing effect can be obtained by the base treatment. Therefore, the base treatment is directly carried out by the dobu dipping method, and both are dried in an atmosphere of about 100 ° C. Formed on both sides.

[0050]

[Table 1]

[0051]

[Table 2]

As the first organic resin-based coating material for forming a lubricious coating film, a polyester resin-based coating material composed of a polyester resin having an average carbon number as shown in Table 1 above is used. For 100 parts by weight, polyethylene wax as an inner wax,
Add to the ratio shown in Table 1 above,
What was uniformly mixed with a stir bar for 5 minutes was prepared for each experimental example, while the first organic resin-based paint was used as the second organic resin-based paint for forming the conductive coating film. In a polyester resin-based paint made of a polyester resin having the same average carbon number as the paint, 100 parts by weight of the polyester resin was used as a Ni filler as a conductive substance (for comparison, in Experimental Example 18, No.) and polyethylene wax, which is an inner wax, are added in the proportions shown in Table 1 above, respectively.
What was uniformly mixed with a stir bar for 5 minutes was prepared for each experimental example. As the conductive material, any one of Ni fillers having the shapes shown in Table 3 below was used, and the average particle diameter (or average major axis) is also shown in Table 1 above.

[0053]

[Table 3]

Then, a predetermined amount was applied to one surface of the aluminum plate of the above-prepared experimental examples 1 to 16 and 18 and the experimental example 9 not subjected to the underlying treatment. Of the first organic resin-based paint, using a bar coater, respectively, while applying a predetermined amount of the second organic resin-based paint (conductive paint) on the other surface,
After applying in the same manner, the coating on both surfaces is cured by heating for 40 seconds in an oven in a 240 ° C. atmosphere so that the surface temperature of the aluminum plate becomes 230 ° C. A double-sided precoated aluminum plate according to Experimental Examples 1 to 16 having a conductive coating film formed thereon and a double-sided precoated aluminum plate according to Experimental Example 18 having a lubricating coating film formed on both surfaces were produced. In addition,
The film thicknesses of the formed lubricous coating film and conductive coating film are shown in Table 1 above.

Using the precoated aluminum plates according to Experimental Examples 1 to 16 and 18 produced as described above, the press formability (press workability), conductivity, and coating film adhesion were as follows. , Ni filler removal and corrosion resistance evaluation tests were carried out, and the evaluation was made on a scale of 5 with 2 or more as a passing level.

-Press Formability-Experimental Examples 1 to 1 in the form of a disk having a diameter of 112.5 mm
The double-sided precoated aluminum plate according to No. 6, 18 is positioned with the surface on which the lubricious coating film is formed on the die side,
The press formability was evaluated by performing deep drawing under the following conditions and determining the maximum depth (forming height) at which no coating film cracks occur on the die side surface. The evaluation was performed according to the following evaluation criteria, and the obtained results are shown in Table 4 below. For comparison, the aluminum plate according to Experimental Example 17 in which no coating film is formed (plate thickness: 1.0 mm, O material of Al-4.5% Mg alloy).
When deep drawing was carried out under the same conditions using a lubricating oil, no deterioration of the properties was observed on the aluminum surface at a forming height of 10 mm. occured. [Processing conditions] Die diameter: φ52.8 mm, punch diameter: φ50 mm, punch shoulder radius of curvature: 5 mm, plate pressing die shoulder radius of curvature: 5 mm, plate pressing force: 34 kN, lubricating oil: not used. [Evaluation Criteria] Evaluation 5: Over 15 mm, Evaluation 4: Over 14 mm, 15 mm
Hereinafter, evaluation 3: more than 13 mm and 14 mm or less, evaluation 2: 1
Exceeding 2 mm and 13 mm or less, evaluation 1: 12 mm or less.

-Conductivity-Two pre-coated aluminum plates of Experimental Examples 1 to 16 (however, in this evaluation test, only a conductive coating film was formed) were used, and the two conductive films were used. The surfaces on which the water-resistant coating is formed are placed on top of each other, and
It is sandwiched between individual copper electrodes (tip area: approx. 3 mm ² ) and approx. 10 k
A pressure of g / cm ² was applied. Then, a constant voltage power supply of 5 V was connected between the precoated aluminum plates, the electric resistance was obtained from the current value flowing in the circuit, and the evaluation was performed according to the following evaluation criteria. The obtained results are shown in Table 4 below. It was shown to. For comparison, the aluminum plate according to Example 18 in which the conductive substance was not contained was measured under the same conditions. As a result, the coating film having no conductive substance hardly conducts electricity, It was confirmed that the electric resistance was 10 ⁶ Ω or more. [Evaluation Criteria] Evaluation 5: less than 0.01Ω, evaluation 4: 0.01Ω or more.
Less than 5Ω, Evaluation 3: 0.5Ω or more and less than 2Ω, Evaluation 2: 2
Ω or more and less than 10 Ω, evaluation 1:10 or more.

-Coating Adhesion- Each of the double-sided precoated aluminum plates of Experimental Examples 1 to 16 and 18 was dipped in boiling water for 2 hours, and then a cross-cut tape peeling test was performed to find out the total of 100 cross-cuts. The coating film adhesion was evaluated by the number of remaining coating films. The evaluation was performed according to the following evaluation criteria, and the obtained results are shown in Table 4 below. [Evaluation Criteria] Evaluation 5: 100, Evaluation 4: 90 or more and less than 100,
Evaluation 3: 80 or more and less than 90, Evaluation 2: 60 or more 8
Less than 0, evaluation 1: less than 60.

-Removal of Ni Filler- Using a Bowden tester, steel balls having a diameter of 4 mm were loaded onto the double-sided precoated aluminum plates of Experimental Examples 1 to 16 and 18 with a load of 500 g and a sliding speed of 4 mm / min. Sliding count: Sliding was performed under the condition of 200 times, and evaluation was performed from the amount of the Ni filler that was released. In addition, such evaluation is performed according to the following evaluation criteria, and the obtained results are
The results are shown in Table 4 below. [Evaluation Criteria] Evaluation 5: Less than 0.1 mg, Evaluation 4: 0.1 mg or more 0.1.
Less than 2 mg, Evaluation 3: 0.2 mg or more and less than 0.3 mg,
Evaluation 2: 0.3 mg or more and less than 0.4 mg, evaluation 1: 0.
4 mg or more.

-Corrosion resistance-Crosscuts were put into the double-sided precoated aluminum plates of Experimental Examples 1 to 16 and 18 using a cutter knife, and a salt spray test was conducted for 720 hours. The evaluation results were shown in Table 4 below. [Evaluation Criteria] Evaluation 5: No change, Evaluation 4: Coating swelling of less than 0.5 mm, Evaluation 3: Coating swelling of 0.5 mm or more and less than 1 mm, Evaluation 2: Coating swelling of 1 mm or more and less than 3 mm, Evaluation 1 : 3m
Swelling of coating film of m or more

[0061]

[Table 4]

As is clear from the results of Table 4, in the double-sided precoated aluminum plates according to Experimental Examples 1 to 16, as compared with the aluminum plate according to Experimental Example 17 in which no coating film was formed, Compared with the aluminum plate according to Experimental Example 18 in which a coating film having no conductive substance is formed, the press plate is excellent in conductivity, and has excellent press moldability, conductivity, and coating adhesion. It can be seen that the properties, the removal of the Ni filler, and the corrosion resistance are all evaluation criteria: 2 or more.

Further, among the double-sided precoated aluminum plates according to Experimental Examples 1 to 16, in the double-sided precoated aluminum plates according to Experimental Examples 1 to 8, the lubricity coating film is a polyester resin having 400 to 1000 carbon atoms. 100
Polyester resin-based paint containing 0.2 to 5.0 parts by weight of inner wax with respect to parts by weight is formed to a film thickness of 5 to 30 μm, and the conductive coating film is made of carbon. 100 parts by weight of the polyester resin of several 400 to 1000 is 1 of the film thickness of the conductive coating film.
-Has a double particle size and a ratio of minor axis / major axis of 0.7-
A spherical Ni filler which is 1 and an inner wax are contained in a proportion of 1 to 20 parts by weight and 0.1 to 4.0 parts by weight, respectively, in a film thickness of 1 to 20 μm. From the place where it is formed, it is recognized that the press moldability, the conductivity, the coating film adhesion, the Ni filler release and the corrosion resistance all satisfy the evaluation criteria: 3 or more.

[0064]

As is apparent from the above description, the double-sided precoated aluminum plate according to the present invention has one surface
From the place where a lubricating coating film made of the first organic resin-based paint is formed, while the conductive coating film made of the second organic resin-based paint containing a conductive substance is formed on the other surface With such a lubricating coating film, while maintaining a high degree of designability, the occurrence of coating film cracking, coating film peeling, etc. is extremely advantageously prevented, and excellent press formability can be realized,
The conductive coating film effectively improves the antistatic performance.

Further, as the first organic resin type coating material for forming the above-mentioned lubricous coating film, in particular, the inner wax is contained in a predetermined ratio and has a carbon number of 400 to 400.
If a polyester resin-based coating material containing 1000 polyester resins as a coating resin is used, and if a lubricating coating film having a thickness of 5 to 30 μm is formed with such a first organic resin-based coating material, a lubricating coating is obtained. Properties such as flexibility, flexibility, and stretchability are more effectively imparted to the film, and more excellent press formability can be enjoyed.

In addition, as the second organic resin coating material (conductive coating material) for forming the conductive coating film, Ni filler having a specific size and shape and the inner wax are provided in predetermined proportions. In addition to using a polyester resin-based coating material containing a polyester resin having 400 to 1000 carbon atoms as a coating resin, the second organic resin-based coating material has a conductive coating film thickness of 1 to 20 μm. If a film is formed, the Ni filler in the conductive coating film realizes a higher degree of conductivity, and can exhibit more excellent antistatic performance than before, and also has a metallic luster of the aluminum plate. Secured at a high enough level,
The detachment of the Ni filler can be advantageously prevented. Moreover, even such a conductive coating film can be imparted with further excellent properties such as flexibility, flexibility and stretchability, and the press moldability can be advantageously enhanced.

Further, according to the present invention, a double-sided precoated aluminum plate is placed with the surface on which the lubricious coating film is formed on the die side, while the surface on which the conductive coating film is formed is located on the punch side. When the processing is performed, the press moldability becomes particularly excellent, and it is possible to effectively prevent the occurrence of coating film cracking, coating film peeling, and the like even on the outer surface of the molded product which is likely to cause problems. Moreover, the outer surface of the molded product produced by press working is provided with excellent designability by the lubricous coating film, and the inner surface is provided with the electrical conductivity by the conductive coating film, which has an antistatic effect. It is played in an advantageous manner.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view showing a specific example of a double-sided precoated aluminum plate according to the present invention, which is set in a press molding machine.

FIG. 2 is a partially enlarged cross-sectional explanatory view showing the structure of the lower surface of the double-sided precoated aluminum plate of FIG. 1 in detail.

FIG. 3 is a partially enlarged cross-sectional explanatory view showing in detail the structure of the upper surface portion of the double-sided precoated aluminum plate of FIG.

FIG. 4 is a partially enlarged cross-sectional explanatory view showing a structure of a conductive coating film different from that of FIG.

[Explanation of symbols]

10 Double-sided pre-coated aluminum plate 12 Aluminum plate 14 Dice 16 Lubricating coating film 18 Punch 20 Conductive coating film 22,23 Base treatment layer 24 Ni filler

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B21D 22/20 B21D 22/20 G B32B 15/08 104 B32B 15/08 104A ZHV ZHVD C09D 5/00 C09D 5 / 00 Z 5/24 5/24 167/00 167/00 191/06 191/06 C23C 22/12 C23C 22/12 22/24 22/24 22/33 22/33 28/00 28/00 Z (72 ) Inventor Mitsuhiro Tamaki 5-11-3 Shimbashi, Minato-ku, Tokyo Sumitomo Light Metal Industry Co., Ltd. (72) Inventor Takahisa Niimi 25-1 Marune, Nishiokayama, Fujioka-cho, Nishikamo-gun, Aichi Prefecture Co., Ltd. in the F-term (reference) 4D075 AE19 AE27 BB05Z BB26Y BB26Z BB73X BB74X BB92Y BB92Z CA03 CA09 CA13 CA22 CA33 DA06 DB07 DC13 DC18 DC21 EA07 EA37 EB16 EB33 EB35 EB38 EB52 EB56 EC07 EC10 EC23 EC53 EC54 4F100 AA22D AA22E AB10A AB16C AB16H AB31 AJ11B AJ11C AJ11H AK01B AK01C AK41B AK41C BA03 BA04 BA05 BA10B BA10C CA19B CA19C CA21C EJ69D EJ69E GB41 CA22 JAK04 JK06 JKABB CA06 JKAB JA16 CA22 NA04 AK00B BB00 A4 11A02 NA04A4 DA02 DA11 DA16 4K044 AA06 AB02 BA02 BA10 BA15 BA17 BA21 BB03 BC03 BC04

Claims (6)

[Claims] 1. A lubricative coating film is formed by applying a first organic resin-based paint to one surface of an aluminum plate and curing the same, while a conductive substance is applied to the other surface. A double-sided precoated aluminum sheet having excellent press formability and conductivity, characterized in that a conductive coating film is formed by applying and curing the second organic resin-based coating material contained therein. 2. The lubricious coating film has a carbon number of 400 to 10
A polyester resin coating containing 0.2 to 5.0 parts by weight of inner wax relative to 100 parts by weight of the polyester resin of No. 00 was used as the first organic resin coating, The double-sided precoated aluminum plate having excellent press formability and conductivity according to claim 1, wherein the double-sided precoated aluminum plate is formed in a film thickness. 3. The conductive coating film has 400 to 10 carbon atoms.
100 parts by weight of polyester resin having a particle diameter of 1 to 2 times the film thickness of the conductive coating film,
A spherical Ni filler having a major axis ratio of 0.7 to 1 and an inner wax were each contained in an amount of 1 to 20 parts by weight and 0.
A polyester resin-based coating material, which is contained in a proportion of 1 to 4.0 parts by weight, is used as the second organic resin-based coating material to have a film thickness of 1 to 20 μm. A double-sided precoated aluminum sheet having excellent press formability and electrical conductivity according to claim 2. 4. The blending ratio of the inner wax in the second organic resin paint is 0.2 to 0.8 of the blending ratio of the inner wax in the first organic resin paint.
Double-sided pre-coated aluminum sheet having excellent press formability and electrical conductivity according to claim 3, which is double. 5. The lubricating coating and the conductive coating are
The press according to any one of claims 1 to 4, which is formed on a surface of an aluminum plate on which a coating type or a reaction type chromate layer or a non-chromate layer is formed by a base treatment. Double-sided precoated aluminum plate with excellent formability and conductivity. 6. A double-sided precoated aluminum plate having excellent press formability and conductivity according to any one of claims 1 to 5, wherein when performing press working, the lubrication of the double-sided precoated aluminum plate is performed. A pressing method characterized in that the surface on which the conductive coating film is formed is positioned on the die side, while the surface on which the conductive coating film is formed is positioned on the punch side.